Screw method for forming a screw thread

In the case of a screw having at least one thread ( 26 ) that is formed by a rolling process, especially a flat-die rolling process, whereby the thread ( 26 ) consists of two ridges of material ( 28 a, 28 b ) which are shaped from a blank ( 12 ) by means of cold-forming during the rolling process in such a way that the thread has a closing crease ( 32 ) where the ridges of material ( 28 a, 28 b ) meet each other, it is provided that the closing crease ( 32 ) is situated in the area of a flank ( 30 a, 30 b ) of the thread ( 26 ).

Method and apparatus for manufacturing a dual-threaded bolt

Embodiments of the present invention comprise methods and apparatuses for manufacturing dual-threaded bolts. The invention comprises utilize rolling dies having one die with coarse thread projections over a surface of the die and fine thread projections over another surface of the die. In some embodiments, the surfaces on which the coarse thread projections and the fine thread projections are located are distinct from one another, or in other embodiments a portion of the surfaces may overlap or be formed integrally within the other projections. In some embodiments a portion of, or all of, the coarse thread projections may be located on a first die section piece while a portion of, or all of, the fine thread projections may be located on separate second die section piece (e.g., an insert) that is operatively coupled to the first die section piece.

NUT, A FASTENING ARRANGEMENT, AND A METHOD OF FASTENING

A nut for fastening a first workpiece defining a through recess to a second workpiece including a bolt projecting in an axial direction through the recess, and the nut comprises an axially extending shank and flange at a first end of the shank, and the nut defines a bore extending axially through the flange and into the shank and further defines an opening to the bore proximate to the first end of the shank, and the nut further includes an elastic holding section radially outward of the opening, and the nut partially defines a depression radially outward of the holding section, so that the holding section can flex radially outward into the depression when the nut is jammed onto the bolt. 1. A nut for fastening a first workpiece defining a through recess to a second workpiece including a bolt projecting in an axial direction through the recess , and the nut comprises: an axially extending shank and flange at a first end of the shank , and the nut defines a bore extending axially through the flange and into the shank and further defines an opening to the bore proximate to the first end of the shank , via the opening the nut being insertable over the bolt , and the nut further includes an elastic holding section radially outward of the opening , and the nut partially defines a depression radially outward of the holding section.2. A nut according to claim 1 , wherein the depression is an annular depression around the opening.3. A nut according to claim 2 , wherein the holding section includes a projection extending radially inward into the opening of the bore.4. A nut according to claim 1 , wherein the nut further defines an introduction taper claim 1 , which narrows from the flange to the opening.5. A nut according to claim 4 , wherein the depression is located radially outward of the opening.6. A nut according to claim 1 , wherein the bore is of circular cross section.7. A nut according to claim 1 , wherein the bore extends axially through the nut and the nut further ...

Nut

In order to optimize a nut and a method for the production of a nut, comprising a nut body which is provided or can be provided with an internal thread and has a polygonal section with a polygonal outer contour which has, on the one hand, edge areas and, on the other hand, key faces which are located between the edge areas and extend in key face planes extending in a manner conforming to standards, in such a manner that it has mechanical properties which are as ideal as possible with as low a weight as possible, it is suggested that the nut body have a plurality of recesses which extend into the nut body in the direction of the bore proceeding from the respective key face planes. 1. Nut , comprising a nut body provided or providable with an internal thread , said nut body having a polygonal section with a polygonal outer contour having , on the one hand , edge areas and , on the other hand , key faces located between the edge areas and extending in key face planes extending in a manner conforming to standards , wherein the nut body has a plurality of recesses extending into the nut body in the direction of the bore proceeding from the respective key face planes.2. Nut as defined in claim 1 , wherein recesses extend into the nut body each proceeding from key face planes located opposite one another.3. Nut as defined in claim 1 , wherein a recess extends into the nut body proceeding from each key face plane of the polygonal section.4. Nut as defined in claim 1 , wherein the recess extends from the respective key face plane as far as a thread-bearing casing surrounding the internal thread in a stabilizing manner.5. Nut as defined in claim 4 , wherein the thread-bearing casing has claim 4 , proceeding from an external diameter of the internal thread claim 4 , a radial minimum thickness of 0.05 times the external diameter of the internal thread.6. Nut as defined in claim 1 , wherein the nut body has a first end face designed as a pressure side with a pressure surface and ...

Blind Nut and Mounting Method thereof

A blind nut includes an internal threaded portion, a hollow tube-shaped portion adjacent to the internal threaded portion, and a flange with an opening provided at the opposite end of the internal threaded portion. The internal threaded portion and the tube-shaped portion are inserted into the mounting hole of a member. The tube-shaped portion includes a first tube-shaped portion adjacent to the internal threaded portion and having a thickness less than that of the internal threaded portion, and a second tube-shaped portion between the first tube-shaped portion and the flange having a thickness less than that of the first tube-shaped portion. A part of the second tube-shaped portion is plastically deformed so as to enlarge the diameter, the deformation of the second tube-shaped portion elastically deforms the first tube-shaped portion so as to enlarge the diameter, mounting the nut to the member. 1. A blind nut including an internally threaded portion , a hollow tube-shaped portion adjacent to the internally threaded portion , and a flange with an opening provided at the opposite end of the internal threaded portion , the internally threaded portion and the tube-shaped portion being inserted into a mounting hole in a member , and a part of the tube-shaped portion becoming plastically deformed so as to enlarge the diameter , thereby securing the member between the deformed expanded diameter portion and the flange , and mounting the nut on the member;Wherein the tube-shaped portion includes a first tube-shaped portion adjacent to the internally threaded portion and the first tube-shaped portion having a thickness less than that of the internally threaded portion, and a second tube-shaped portion positioned between the first tube-shaped portion and the flange, the second tube-shaped portion having a thickness less than that of the first tube-shaped portion.2. The blind nut of claim 1 , wherein when a part of the tube-shaped portion is plastically deformed so as to ...

RIVET NUT AND RIVET BOLT AND COMBINATION OF A RIVET NUT OR A RIVET BOLT WITH A SHEET METAL PART

The invention relates to a rivet nut () with a base part () and a cylindrical rivet section (), the base part having a central threaded cylinder (), an annular contact surface () that is coaxial to the threaded cylinder in a plane () perpendicular to the longitudinal axis () of the threaded cylinder, and that has an axially aligned annular groove (), said groove being arranged radially inside the annular contact surface and radially outside the cylindrical rivet section and said groove blending, on the radially inner side, into the outer surface of the cylindrical rivet section, and antirotation ribs () being provided in the area of the annular groove. The invention is characterized in that the annular groove, when seen in an axial cross-sectional plane, has a U-shaped cross-section with a radially outer lateral wall () which is relatively steep and which has, at the steepest point (), an inclination to the center longitudinal axis of the rivet nut in the range of approximately 45° to approximately −20°, preferably of approximately 30° to approximately 0°. The volume of the annular groove is chosen in such a manner that across a range of sheet thicknesses adapted to the respective thread size there is room for the volume of the respective folded region of the rivet section inside the annular recess () that is formed by molding the sheet part () into the annular groove of the element and that it does not project beyond the side () of the molded sheet facing away from the annular contact surface. 11012141616202224181424. A rivet nut () adapted to be used with sheet metal parts having a thickness within a pre-selected range; the rivet nut having a body part () and a cylindrical rivet portion () , with the body part having a centrally arranged thread cylinder () , a ring-shaped support surface () coaxial to the thread cylinder in a plane () perpendicular to the longitudinal axis () of the thread cylinder and an axially aligned ring groove () which is arranged radially ...

WELD STUD

A welding stud including a head and a shank extending from the head. The shank has an end region opposite the head and the end region includes at least two angled surfaces which incline towards an axis of the shank in a direction moving away from the head. 1. A welding stud comprising:a head and a shank extending from the head;wherein the shank has an end region opposite the head, wherein the end region comprises at least two angled surfaces which incline towards an axis of the shank in a direction moving away from the head.2. The welding stud of claim 1 , wherein the angled surfaces are inclined in the range of 2° to 20° with respect to the axis.3. The welding stud of claim 1 , wherein the angled surfaces are inclined in the range of 3° to 12° with respect to the axis.4. The welding stud of claim 1 , wherein the angled surfaces are inclined by about 6° with respect to the axis.5. The welding stud of claim 1 , wherein the end region includes at least four angled surfaces.6. The welding stud of claim 1 , wherein the end region of the shank includes at least one tapered gradation of diameter7. The welding stud of claim 1 , wherein the shank includes an external thread.8. The welding stud of claim 7 , wherein the end region includes at least one tapered gradation of diameter claim 7 , the diameter of the gradation of diameter being slightly smaller than a minor diameter of the thread.9. The welding stud of claim 7 , wherein the end region of the shank includes a first and a second gradation of diameter claim 7 , wherein the first gradation of diameter is farther away from the head of the shank and is smaller than the second gradation of diameter claim 7 , andwherein the second gradation of diameter is smaller than a nominal diameter of the thread.10. The welding stud of claim 7 , wherein the shank includes at least one paint scraping groove that extends in a longitudinal direction of the shank and at which the threads are interrupted.11. The welding stud of claim 10 , ...

Manufacturing method and equipment for intensifying hardness of screws

A manufacturing method and equipment for intensifying hardness of screws includes at least three steps. A first step is to have a steel wire forged into a first blank with a screw head and a screw shank. A second step is to convey the first blank into a thread shaping die to have the outer diameter of the shank of the first blank diminished to form a second blank through the first sectional cold forging region of the thread shaping die for intensifying the hardness of the shank. A third step is to have the second blank directly moved into the second sectional thread-forming region of the thread shaping die to shape threads and a pointed tail of the shank. Thus, both the second step and the third step can be carried out within the same thread shaping die, able to elevate shaping speeds and hardness of screws.

Tack Screw

The present clinch screw can be secured through a hole in a sheet of metal by a simple press-in application like a tack pin. An undercut clinch feature on the screw shank just underneath the head and above a threaded bulb portion of the shank secures the screw to the sheet as material from the sheet cold-flows into the undercut. Simultaneously, sheet material also flows around and between the bulb threads which forms partial female threads in the sidewall of the sheet hole and provides added pull-out resistance. The screw can then be simply turned out to remove it. In doing so additional female threads are cut into the upper portion of the hole sidewall as the threaded bulb moves upward and then out of the hole. A re-useable threaded hole in the sheet is left behind. 1. A metal-clinching tack screw for attachment to a metal sheet comprising:a top most head being the largest diameter of the screw;a shoulder extending axially downward from the head immediately below it, said shoulder having a bottom surface for displacing material from a sheet of metal into which it is installed;a barrel-shaped shank beginning directly beneath the shoulder and further described as having sides of arcuate longitudinal cross-section which taper inwardly above and below a midsection bulb;integral heilical screw threads on the outer surface of said bulb; andan undercut located between the bottom of the shoulder and the bulb adapted to receive material displaced by said shoulder bottom surface.2. The screw of wherein said shank further includes a tapered bottom portion extending downward from said bulb to an end of the screw.3. The screw of wherein the diameter of the bulb is less than the diameter of the shoulder.4. An assembly of tightly joined first and second sheets face-to-face comprising:a top most head being the largest diameter of the screw;a shoulder extending axially downward from the head immediately below it, said shoulder having a bottom surface for displacing material from a ...

Method for Producing Screws and Concrete Screw

A method for producing a concrete screw is disclosed. The lateral surface of the shaft includes, on the end of the shaft, at least one cut-out recess. A piece of rod is provided as a workpiece, at least one threaded coil is formed on the lateral surface in a thread rolling process in which two profiled rolling tools act on the workpiece, and at least one recess is formed in the lateral surface on an end area of the workpiece. The recess, when seen in the cross-section of the workpiece, is diametrically opposite an area of the workpiece free of recesses such that initially the recess is formed in the lateral surface and subsequently, the threaded coil is formed on the lateral surface of the workpiece, and at least one of the rolling tools also acts upon the end area with the recess during the thread rolling process. 112-. (canceled)13. A method for producing a screw , comprising the steps of:providing a piece of a rod as a workpiece;forming a threaded coil on a lateral surface of the workpiece in a thread rolling process in which two profiled rolling tools act on the workpiece; andforming a recess in the lateral surface of the workpiece on an end area of the workpiece;wherein the recess, in a cross-section of the workpiece, is diametrically opposite from an area of the workpiece that is free of a recess;wherein initially the recess is formed in the lateral surface of the workpiece, and subsequently, the threaded coil is then formed on the lateral surface of the workpiece;and wherein at least one of the two profiled rolling tools acts on the end area of the workpiece with the recess during the thread rolling process of the threaded coil forming step.14. The method according to claim 13 , further comprising a plurality of recesses formed in the lateral surface of the workpiece wherein the plurality of recesses is an uneven number of recesses.15. The method according to claim 14 , wherein the plurality of recesses claim 14 , in the cross-section of the workpiece claim ...

Method for Producing a Concrete Screw

A method for producing a concrete screw is disclosed. The method includes providing a wire piece as a workpiece, forming a thread helix on a lateral surface of the workpiece, and providing a depression in the lateral surface of the workpiece by a forming process. 19.-. (canceled)10. A method for producing a concrete screw , comprising the steps of:providing a wire piece as a workpiece;forming a thread helix on to a lateral surface of the workpiece; andproviding a depression in the lateral surface of the workpiece by a forming process.11. The method according to claim 10 , wherein the step of providing the depression is performed and subsequently the step of forming the thread helix is performed.12. The method according to claim 11 , wherein a geometry of the depression is changed when forming the thread helix.13. The method according to claim 12 , wherein the thread helix is formed in a thread rolling process claim 12 , wherein during the thread rolling process a profiled rolling tool acts on the workpiece and sets the workpiece in motion in a workpiece rotational direction claim 12 , and wherein the rolling tool acts on a sub-region of an edge of the depression and deforms the depression.14. The method according to claim 13 , wherein the depression is asymmetric in a cross-sectional perspective of the workpiece claim 13 , wherein a flank of the depression leading in a screw-in direction of the thread helix runs flatter in relation to the lateral surface than a flank of the depression trailing in the screw-in direction.15. The method according to claim 10 , wherein the concrete screw has a screw head that is broadened relative to a shank of the concrete screw and is formed from an end-side thickening.16. The method according to claim 15 , wherein the screw head is formed simultaneously with the providing of the depression in the lateral surface of the workpiece.17. The method according to claim 10 , wherein the depression is open toward a front face of the workpiece ...

Concrete Screw

A concrete screw is disclosed. The concrete screw includes a shank and a thread disposed on the shank with a thread helix and a thread root. A cutting recess is disposed in a tip region of the shank where the cutting recess runs at least in sections within the thread root and without interrupting the thread helix. A rolling die for producing the concrete screw and a method for producing the concrete screw are also disclosed. 115.-. (canceled)16. A concrete screw , comprising:a shank; anda thread disposed on the shank with a thread helix and a thread root;wherein a cutting recess is disposed in a tip region of the shank and wherein the cutting recess runs at least in sections within the thread root and without interrupting the thread helix.17. The concrete screw according to claim 16 , wherein the cutting recess is interrupted at least one time by the thread helix.18. The concrete screw according to claim 16 , wherein the cutting recess runs in at least one section outside of the thread root and wherein the cutting recess is open toward a front face of the shank.19. The concrete screw according to claim 16 , wherein the cutting recess runs at least in a section within a first turn of the thread root beginning at a thread start.20. The concrete screw according to claim 16 , wherein a depth of the cutting recess is at least 10/100th of a diameter of the shank.21. The concrete screw according to claim 16 , wherein the cutting recess claim 16 , in a cross-sectional view of the shank claim 16 , is asymmetric wherein a first flank of the cutting recess leading in a screw-in direction of the thread helix runs flatter relative to a lateral surface of the shank than a second flank of the cutting recess trailing in the screw-in direction.22. The concrete screw according to claim 16 , further comprising a second cutting recess in the shank.23. The concrete screw according to claim 16 , wherein in the tip region of the shank claim 16 , a plurality of cutting recesses are ...

THREAD-FORMING SCREW AND PRODUCTION THEREOF

The invention relates to a thread-forming screw () comprising a base body () which comprises a drive and a screw shank, the screw shank carrying a thread () having a channeling region () and a carrying region, the base body () consisting of a base material. The invention is characterized in that the thread () is formed from a coating material () different from the base material, at least in the channeling region (), which is applied to the base material by deposition welding. 1. A thread-forming screw comprising a base body which comprises a drive and a screw shaft , the screw shaft carrying a thread having a thread-forming region and a load-bearing region , wherein the base body is formed from a base material , and at least in the thread-forming region , the thread is formed from a coating material different from the base material that is applied to the base material by deposition welding.2. A thread-forming screw according to claim 1 , wherein the thread in the thread-forming region is harder than the base material.3. A thread-forming screw according to claim 2 , wherein the base material is a rustproof and acid-resistant steel.4. A thread-forming screw according to claim 3 , wherein the rustproof and acid-resistant steel is an austenitic stainless steel.5. A thread-forming screw according to claim 1 , wherein the base material is an aluminum alloy and the coating material is a different metal alloy or an alloy mixture.6. A thread-forming screw according to claim 1 , wherein the coating material is a hardenable steel.7. A thread-forming screw according to claim 1 , wherein the coating material has a layer thickness of at least 5% of the shaft diameter of the screw shaft.8. A thread-forming screw according to claim 1 , wherein the thread in the load-bearing region is forming by rolling claim 1 , and in the thread-forming region it is exclusively constituted by the coating material that has been applied by deposition welding and not been treated mechanically.9. A ...

Screw thread roller burnishing apparatus

Internal and external screw thread burnishing assemblies are provided. In the internal screw thread burnishing assembly, diametrically opposed removable cartridges carrying burnishing wheels are received in cavities of a support structure axially movable into the space circumscribed by the internal screw thread. Fluid pressure is utilized to forcibly translate the cartridges radially outwardly to place their burnishing wheels into burnishing engagement with the internal screw thread, with a spring structure resiliently biasing the cartridges toward retracted orientations thereof within the support structure. In the external screw thread burnishing assembly, burnishing wheels are carried on the outer ends of pivotally supported arms which may be pivoted by fluid pressure to drive the burnishing wheels into burnishing engagement with diametrically opposite portions of the external screw thread, with a spring structure resiliently biasing the arms pivotally away from one another.

BOLT WITH BRAKED UNSCREWING

A bolt with braked unscrewing consists of a screw and a nut. The screw or nut includes, in the axial direction, at least three stepped portions of continuous thread, namely an introduction portion for introducing the screw into the nut, a braking portion and an intermediate portion connecting the introduction portion to the braking portion. The braking portion has a thread diameter that is constant and different from the thread diameter of the introduction portion. 19-. (canceled)10. A bolt with braked unscrewing consisting of a screw and a nut , said screw or said nut comprising in the axial direction at least three stepped portions of continuous thread , including an introduction portion for introducing the screw into the nut , a braking portion and an intermediate portion connecting the introduction portion to the braking portion , wherein said braking portion has a thread diameter that is constant and larger if it belongs to the screw , smaller if it belongs to the nut , than the thread diameter of the introduction portion.11. The bolt according to wherein the continuous thread has the same pitch and the same height along the introduction portion claim 10 , the intermediate portion and the braking portion.12. The bolt according to claim 10 , wherein the introduction portion represents at least one pitch of threading.13. The bolt according to claim 10 , wherein the braking portion represents at least one pitch of threading claim 10 , in particular the length of the braking portion is at least one third of the axial length of the nut.14. The bolt according to claim 10 , wherein the ratio between the thread diameter of the introduction portion and the thread diameter of the braking portion for a screw claim 10 , its inverse for a nut claim 10 , is between 0.92 and 0.96.15. A screw intended for collaborating with a nut to form the bolt according to claim 10 , wherein said screw comprises in the axial direction at least three stepped portions of continuous thread ...

ROLL FORMING MACHINE WITH RECIPROCATING DIES

A reciprocating die roll forming machine for forming a pattern such as a thread form on the outer surface of a cylindrical blank includes at least one set of reciprocating dies operating upon the blank which rotates in place. The machine includes a slide and bearing combination to support the dies belt driven by a servo-motor controlled by a central processing unit. Mechanism is provided to deliver and position a blank for engagement by the dies. In one form, the machine includes multiple die sets to produce multiple parts during one die reciprocation cycle. In another form, the machine employs separate drive mechanisms to independently drive each die of a set. 1. A reciprocating die , pattern forming machine to form a pattern on a cylindrical surface of a blank having a cylindrical pattern receiving surface , said machine , comprising ,a base,a pair of slidable members reciprocal on said base and movable along paths parallel to and on opposite sides of a longitudinal plane;at least one pair of pattern forming dies each having a leading edge and a trailing edge and a pattern forming face mounted on said slidable members in facing relation,mechanism to deliver and position a blank between said leading edges of said dies when said leading edges of said dies are spaced apart a distance greater than the diameter of the cylindrical pattern receiving surface,drive mechanism for said slidable members to reciprocate said dies between fully retracted and fully inserted positions,said faces of said dies arranged to simultaneously engage the cylindrical pattern receiving surface of the positioned blank on diametrically opposite surfaces of said cylindrical pattern receiving surface,axial translation of said dies from said fully retracted position to said fully inserted position causing the blank to rotate about its longitudinal center between said pattern forming faces to impart said pattern upon said cylindrical pattern receiving surfacesaid dies arranged to support the blank ...

THREADED REINFORCING BAR COUPLING FOR DEFORMED REINFORCING BAR, AND THREADED DEFORMED REINFORCING BAR

A threaded reinforcing bar coupling for a deformed reinforcing bar according to the present invention connects a pair of reinforcing bars (), which are deformed reinforcing bars, with male threaded portions () provided at end portions of the reinforcing bars and a threaded cylinder (). In each reinforcing bar (), by roll forming on an iron wire rod which is a raw material, a projection () on an outer peripheral surface is formed and a diameter enlarged portion which is larger in diameter than another portion is formed in a portion in a longitudinal direction. An outer diameter of the diameter enlarged portion is not larger than a reinforcing bar outermost diameter (D) including the projection () of the reinforcing bar (). The male threaded portion () is formed in the diameter enlarged portion by rolling. 1. A threaded reinforcing bar coupling for a deformed reinforcing bar , the threaded reinforcing bar coupling connecting a pair of reinforcing bars , whereina male threaded portion is provided at each of opposed end portions of the pair of reinforcing bars to be connected to each other,a threaded cylinder is provided so as to be screwed onto the male threaded portions of both reinforcing bars,at least one reinforcing bar of the pair of reinforcing bars is a deformed reinforcing bar including a projection on an outer peripheral surface of a reinforcing bar main body, andin the at least one reinforcing bar which is the deformed reinforcing bar, the projection on the outer peripheral surface is formed and a diameter enlarged portion which is larger in diameter than another portion is formed in a portion in a longitudinal direction by roll forming on an iron wire rod which is a raw material, an outer diameter of the diameter enlarged portion is not larger than a reinforcing bar outermost diameter including the projection of the reinforcing bar, and the male threaded portion is formed in the diameter enlarged portion by rolling.2. The threaded reinforcing bar coupling ...

Anti-Loose Screw and a Die Device for Forming Same

An anti-loose screw () includes a shank () having an external thread () with a thread angle of 63° to 68° between two flanks () extending between a crest () and a root (). A first angle (A) between one of the flanks () and an axis (Y) extending perpendicularly to a longitudinal axis (X) of the shank () and passing through the crest () is in a range between 34° and 40°. A second angle (B) between the other flanks () and the axis (Y) is in a range between 25° and 29°. The anti-loose screw () can engage with an object () having an internal thread () with a thread angle of 60° to provide an interference fit and can be formed by two dies () each including a thread forming configuration () having correspondingly formed ridges () and valleys (). 1. An anti-loose screw comprising a head and a shank extending from a side of the head , with the shank including an external thread formed on an outer periphery thereof , with the external thread including a crest and a root , with the crest and the root being helical , with a first flank and a second flank extending between the crest and the root , with the external thread including a thread angle of 63° to 68° between the first and second flanks , with the shank including a longitudinal axis , with an axis extending perpendicularly to the longitudinal axis and passing through the crest , with the thread angle including a first angle and a second angle , with the first angle defined between the axis and one of the first and second flanks , with the second angle defined between the axis and another of the first and second flanks , with the first angle being in a range between 34° and 40° , with the second angle being in a range between 25° and 29°.2. The anti-loose screw as claimed in claim 1 , wherein the thread angle of the external thread is about 64°.3. A combination comprising:an anti-loose screw including a head and a shank extending from a side of the head, with the shank including an external thread formed on an outer ...

METHOD FOR PRODUCING A BALL RACEWAY ON A WORKPIECE AND A BALL SCREW NUT HAVING A BALL RACEWAY THUS PRODUCED

A method for producing a ball raceway on a workpiece includes providing the workpiece, machining a preliminary thread profile on the workpiece and providing a thread rolling tool. The thread rolling tool has a tool shank, and the tool shank has a free end with a tool head having a roller profile. The method also includes clamping the workpiece into the thread rolling tool, rotating the workpiece about an axis of rotation, moving the tool shank longitudinally along the workpiece, and rolling the roller profile on the preliminary thread profile to generate a final thread profile.

METHOD OF MACHINING SCREW

A method of machining a screw is provided that is capable of preventing formation of a protruding section at a thread tip section. A thread is formed by cutting on a cylindrical body, and a surface of the thread is plastically deformed by rolling. Because of the cutting, a width between-side surfaces of a thread tip section is in a narrowed state as compared to a normal width. This width is narrowed toward a tip of the thread while a thread body section has a width expanded as compared to a normal width. Consequently, the side surfaces are formed to bulge by an excess thickness portion as compared to normal side surfaces. The rolling plastically deforms both side surfaces to cause the excess thickness portion to plastically flow toward the side surfaces. 1. A method of machining a screw including forming a thread on a work material by cutting and subsequently plastically deforming a surface of the thread by rolling , whereinbecause of the cutting, a width between both side surfaces of a tip section of the thread is in a narrowed state as compared to a width between both normal side surfaces of the thread tip section and is gradually narrowed toward a tip of the thread while a body section closer to a base end as compared to the tip section of the thread has a width between both side surfaces of the thread body section expanded as compared to a width between both normal side surfaces of the thread body section so that each of the side surfaces of the thread body section is formed to bulge by an excess thickness portion as compared to the normal side surfaces of the thread body section, and whereinthe rolling plastically deforms the both side surfaces of the thread body section to cause the excess thickness portion to plastically flow toward each of the side surfaces of the thread tip section.2. The method of machining a screw according to claim 1 , whereinthe cutting forms the thread tip section into a shape tapered toward a tip thereof.3. The method of machining a ...

HIGH PERFORMANCE THREAD ROLLING AND THREAD LOCKING FASTENER

A thread rolling and self locking fastener is provided. A thread rolling external thread is disposed along the shaft of the fastener. A non-continuous core thread is also disposed thereon. 1. A fastener comprising:a head from which a shank extends in a first axis, the shank having a thread rolling helical thread formed thereon; andone or more core threads disposed along the shank.2. The fastener of where in the shank has a circular cross section.3. The fastener of wherein the shank has cross section having three lobes.4. The fastener of wherein the one or more core threads are spaced approximately a width of a nut member apart along the shank.5. The fastener of wherein the one or more core threads are disposed between threads of the thread rolling helical thread along the shank.6. A fastener comprising:a shank extending along a first axis, a head connected to a first end of the shank, the head extending perpendicular to the first axis, wherein the head is configured to accept a driving force;a first thread disposed along the shank from the head to substantially a second end of the shank, the first thread configured to form internal threads in a nut member;a second thread disposed along one or more portions of the shank, the second thread forming material of the nut member into a locking mechanism when the fastener is inserted into the nut member.7. The fastener of wherein the second thread reforms material of the nut member when the fastener is removed.8. The fastener of wherein the first thread is a self tapping thread.9. The fastener of wherein the second thread is substantially periodic along the shank from the head to the second end of the shank.10. A system comprising:a fastener having a first thread and a second thread disposed thereon, the first thread being a thread rolling thread and the second thread being a core thread; anda nut member, the nut member being deformed by the second thread upon insertion so that the fastener and nut member are locked and ...

LINEAR MOTION SHAFT FOR STEERING DEVICE, STEERING DEVICE, AND METHOD OF MANUFACTURING THESE

A method for manufacturing a linear motion shaft includes: manufacturing a first shaft portion, and connecting the first shaft portion and a second shaft portion by friction welding. A first input section is formed in a material for the first shaft portion to obtain the first shaft portion and then a gripped section for centering is formed on the outer peripheral surface of an axially end portion of the first shaft portion on the side connected to the second shaft portion based on the first input section. The friction welding is performed by abutting the axially end portions of the first shaft portion and the second shaft portion in a state where the gripped section is gripped by a first gripping tool for centering, the first shaft portion is rotated with the first gripping tool, and the second shaft portion remains without rotating. 1. (canceled)2. (canceled)3. A method for manufacturing a linear motion shaft for a steering device ,the linear motion shaft comprising: a first shaft portion having a first input section on an outer peripheral surface thereof to which a driving force for making linear motion in an axial direction is input, a second shaft portion, and a joint between the first shaft portion and the second shaft portion,the manufacturing method comprising:a process of manufacturing the first shaft portion, anda process of connecting the first shaft portion and the second shaft portion by friction welding,the process of manufacturing the first shaft portion including a process of forming the first input section in a material for the first shaft portion and a process of forming a gripped section for centering on an outer peripheral surface of an end portion in the axial direction of the first shaft portion on a side connected to the second shaft portion based on the first input section after forming the first input section, andthe friction welding is performed by abutting an end portion in the axial direction of the first shaft portion and an end portion ...

THREAD ROLLING TOOL

The invention relates to a thread rolling tool for rolling or repairing a thread with a tool body () a profiled roller () that is mounted on the tool body (), and at least one counter roller () that has a counter roller rotational axis (D) and is mounted on the tool body (). According to the invention, it is recommended that the profiled roller () and/or the at least one counter roller () is mounted so that it is axially displaceable. 1. A thread rolling tool for rolling and/or repairing a thread , comprising:(a) a tool body,(b) a profiled roller that is mounted to the tool body, and has a counter roller rotational axis and', 'is mounted to the tool body,, '(c) at least one counter roller, which'}wherein(d) the profiled roller and/or the at least one counter roller is mounted so that it is axially displaceable.2. Thread rolling tool according to claim 1 , wherein has a base body and', 'an arm,, '(a) the tool body'}(b) at least one of the profiled roller or at least one counter roller is mounted on the base body,(c) at least one of the profiled roller or at least one counter roller is fixed to the arm, and a locking position, in which the tool body is locked around a work piece, and', 'an opening position in which the arm can be moved relative to a base board in such a way that the work piece can be removed., '(d) the arm is configured to be put in'}3. Thread rolling tool according to wherein the profiled roller has a profiled roller rotational axis (D) and both the profiled roller rotational axis (D) and the counter roller rotational axis (D) comprise a maximum offset angle of 2°.4. Thread rolling tool according to wherein the at least one counter roller includes at least a second counter roller which has a second counter roller rotational axis (D) that runs parallel to the counter roller rotational axis (D).5. Thread rolling tool according to wherein the arm is connected to the base body by a snap connection.6. Thread rolling tool according to wherein the profiled ...

Insert Fastener with a Compression Sleeve

A two-part fastener with an insert and a compression sleeve. The insert is an internally-threaded fastener intended to be installed into a hole of a very hard panel. The insert itself is relatively hard with a knurled outer barrel portion and a flange at the bottom. A compression sleeve is made of relatively soft material and is preassembled around the barrel of the insert by friction fit. Upon installation into a panel with a blind hole having parallel sides, the compression sleeve is pressed into the panel and deforms outwardly between the insert and the side wall of the hole. Friction between the compression sleeve and the wall of the hole prevents torque out and pull out of the fastener from the panel. 1. A two-part fastener , comprising:a generally-cylindrical insert made of a first material and having a barrel with knurls on an outer surface thereof;a flange on said insert at a bottom end thereof; and, a bottom end abutting the top of said flange;', 'a bottom portion rigidly affixed around a lower portion of said barrel by friction fit; and,', 'a top portion with an enlarged internal diameter radially spaced away from an upper portion of said barrel., 'a generally-cylindrical, deformable sleeve made of a second material softer than said first material, having2. The device of wherein the knurls comprise axially-extending teeth.3. The device of wherein the bottom of the flange has a chamfer.4. The device of wherein the insert has an axial through-bore.5. The device of wherein the through-bore is threaded.6. The device of wherein the sleeve has a chamfer on the top end thereof.7. The device of wherein the diameter of the flange is approximately equal to the outer diameter of the sleeve.8. The device of wherein the top end of the sleeve extends upwardly beyond the top of the insert.9. An assembly comprisinga) a panel having a receiving hole; and, i) a generally-cylindrical insert made of a first material and having a barrel with knurls on an outer surface thereof ...

FLOATINGLY MOUNTED MULTI-PIECE ROLLING TOOL, AND ROLLING MACHINE

A rolling tool () has a basic body () for fastening the rolling tool () in a rolling machine () and a profiled part () for the shaping treatment of a workpiece () to be rolled. The basic body () and the profiled part () are of multi-piece design. The basic body () and the profiled part (), in their interconnected position, are mounted movably relative to one another in a plane perpendicular to the rolling direction (). The basic body () of the rolling tool () can also be part of the rolling machine (). 15. A rolling tool () , having{'b': 6', '5', '1, 'a basic body () for fastening the rolling tool () in a rolling machine (), and'}{'b': 7', '2, 'a profiled part () for the shaping treatment of a workpiece () to be rolled,'}{'b': 6', '7, 'wherein the basic body () and the profiled part () are of multi-piece design and designed such that they can be connected to one another and nondestructively separated from one another, characterized in that'}{'b': 6', '7', '23, 'the basic body () and the profiled part (), in their interconnected position, are mounted movably relative to one another in a plane perpendicular to the rolling direction () while exclusively overcoming the static friction between them.'}2523. The rolling tool () as claimed in claim 1 , characterized in that the degree of the movability along only one axis in the plane perpendicular to the rolling direction () is at least 0.1 mm claim 1 , in particular between 0.1 mm and 0.3 mm claim 1 , in particular between 0.1 mm and 0.2 mm claim 1 , in particular approximately 0.1 mm.35723. The rolling tool () as claimed in claim 1 , characterized in that the profiled part () is designed as a threaded rolled part with a pitch claim 1 , and the degree of the movability along only one axis in the plane perpendicular to the rolling direction () is at least 5% claim 1 , in particular at least 8% claim 1 , in particular at least 10% claim 1 , in particular between 5% and 15% claim 1 , in particular approximately 10% claim 1 , ...

COLD ROLLING DEVICES AND COLD ROLLED ROTARY SHOULDERED CONNECTION THREADS

A device for cold rolling a thread on a tubular support member of a rotary shouldered thread connection includes obtaining an original root depth of a thread root, cold rolling the thread until a minimum increased root depth tolerance is achieved. 1. A thread cold rolling device , comprising: an equivalent root radius of at least about 0.057 inches;', 'a first and a second wheel angle between the center axis and opposing sides of an outer surface of the wheel tip, wherein the first wheel angle is at least about 20 degrees; and', 'a root depth of at least about 0.012 inches., 'a wheel having a center axis perpendicular to a wheel rotational axis and a wheel tip having an elliptical root profile comprising2. The device of claim 1 , wherein the elliptical root profile of the wheel tip further comprises:a major axis having a semi-major axis length of about 0.050 inches to about 0.055 inches; anda minor axis having a semi-minor axis length of about 0.013 to about 0.020 inches.3. The device of claim 1 , wherein the outer surface of the wheel has a roughness of about 8 to about 32 micro-inches.4. The device of claim 1 , wherein the outer surface of the wheel has a roughness of about 16 micro-inches.5. The device of claim 1 , wherein the first wheel angle and the second wheel angle may be the same or may be different.6. The device of claim 1 , wherein the second wheel angle is about 15 to about 20 degrees.7. The device of claim 1 , wherein the first wheel angle is about 25 to about 29 degrees and the second wheel angle is about 17 to about 20 degrees.8. The device of claim 1 , wherein:the equivalent root radius is about 0.058 inches;the root depth is about 0.014 inches;the first wheel angle is about 28 degrees;a major axis of the elliptical root profile of the wheel tip has a semi-major axis length about 0.052 inches; anda minor axis of the elliptical root profile of the wheel tip has a semi-minor axis length of about 0.016 inches.9. The device of claim 8 , wherein the ...

POSITIONING AND CLAMPING SYSTEM FOR THREAD ROLLING

The present invention is a die positioning system for use in positioning mobile or fixed dies. The system includes a pair of key bars, a pair of key disc inserts, a set of key discs, and a set of disc backers. The key bars and key discs serve to offset manufacturing dies or die holders. Using key bars and/or key discs from different pairs of key bars and/or sets of key discs also allows for precise angulation of the dies or die holders. The key discs are held in place between the die and die holder, or between the die holder and key base, by the key disc inserts and angled (if feasible) by the disc backers. The key bars, located between the key disc inserts and the die or die holder allow additional offset of the die or die holder. The solid, stacked configuration of the key bars and key discs prevents the die or die holder from gradually or suddenly losing its positioning. 1. A die positioning system , comprising:a pair of key bars, each key bar of the pair of key bars having a solid rectangular cuboid configuration identical to the other key bar of the pair of key bars;a pair of key disc inserts, each key disc insert having at least one disc aperture extending therethrough;a set of key discs, each key disc of the set of key discs having a solid three-dimensional configuration identical to the other key discs of the set of key discs, each key disc having a diameter equal to or less than a diameter of the at least one disc aperture; anda set of disc backers, wherein the forward surface of each disc backer comprises a backer surface having a non-planar configuration.2. The system of claim 1 , wherein each key disc insert has a stepped configuration between a thicker section and a thinner section claim 1 , the at least one disc aperture extending through the thinner section and each key disc having a thickness greater than or equal to a thickness of the thinner section.3. The system of claim 1 , wherein at least one backer surface has a convex or domed configuration.4 ...

THREADING BOLT AND CORE STACKING TABLE, BUILDING PLATFORM, STACKING DEVICE OR THE LIKE COMPRISING AT LEAST ONE THREADING BOLT

A threading bolt () for stacking sheets provided with at least one threading hole (), in particular core sheets () of transformer cores, on a core stacking table (), on a building platform, on a stacking device or the like, at least one threading bolt () being positionable on the core stacking table (), on the building platform, on the stacking device or the like, wherein the outer diameter (D) of the threading bolt () is adaptable to different inner diameters (d) of the threading holes (). 112341412. A threading bolt () for stacking sheets provided with at least one threading hole () , in particular core sheets () of transformer cores , on a core stacking table () , on a building platform , on a stacking device , at least one threading bolt () being positionable on the core stacking table () , on the building platform , on the stacking device wherein the outer diameter (D) of the threading bolt () is adaptable to different inner diameters (d) of the threading holes ().2. The threading bolt according to claim 1 , wherein{'b': 1', '8', '4', '9', '8', '6', '1, 'the threading bolt () has a base part () which is detachably connectable to the core stacking table (), to the building platform or the like, a centering part () which extends vertically above the base part (), and a centering tip () which is provided at the upper end of the threading bolt ().'}3. The threading bolt according to claim 1 , wherein{'b': 10', '9, 'at least one longitudinal portion () which extends across a section of the centering part () is adjustable in the radial direction.'}4. The threading bolt according to claim 1 , wherein{'b': 1', '11', '10', '9', '11', '16', '15', '1', '11', '1, 'sub': 'a', 'the threading bolt () has a cavity () at least in the longitudinal portion () that extends across a section of the centering part (), said cavity () being fillable with a fluid medium via a connecting bore (), which extends from the lower end () of the threading bolt () to the cavity (), in order to ...

FIXING STRUCTURE

A fixing structure, configured to fix screw. Screw includes wide portion and narrow portion. Fixing structure includes plate part, holding component and elastic positioning component. Plate part includes top surface, bottom surface and mount groove. Mount groove penetrates through top surface and bottom surface and narrow portion is disposed through mount groove to allow wide portion to rest on top surface. Holding component and top surface together form space. Elastic positioning component is disposed on plate part. When wide portion is located in space and between holding component and top surface, and elastic positioning component is in holding state and located at side of wide portion, wide portion is prevented from being moved away from space. When elastic positioning component is switched to released state, elastic positioning component is removed from side of wide portion so that wide portion is allowed to move away from space. 1. A fixing structure , configured to fix a screw , the screw comprising a wide portion and a narrow portion that are connected to each other , the fixing structure comprising:a plate part, comprising a top surface, a bottom surface and a mount groove, wherein the top surface faces away from the bottom surface, the mount groove penetrates through the top surface and the bottom surface and the narrow portion is configured to be disposed through the mount groove so as to allow the wide portion to rest on the top surface;a holding component, protruding from the top surface, wherein the holding component and the top surface together form a space therebetween; andan elastic positioning component, disposed on the plate part;wherein, when the wide portion is located in the space and located between the holding component and the top surface, and the elastic positioning component is in a holding state and located at a side of the wide portion, the wide portion is prevented from being moved away from the space; when the elastic positioning ...

Asymmetric Flow Path Topology

Flow paths and boundary layer restart features are provided. For example, a flow path comprises a flow path wall defining an inner flow path surface and an asymmetric notch defined in the flow path wall. The asymmetric notch comprises a first surface and a second surface and is asymmetric about a first line extending through an intersection of the first and second surfaces. Further, a flow boundary layer restart feature comprises a first surface extending inward with respect to a flow path surface of a flow path and a second surface extending inward with respect to the flow path surface. The second surface is asymmetric with respect to the first surface such that the first and second surfaces define an asymmetric notch. Additionally, a flow path wall may comprise an asymmetric notch that includes a flow expansion angle and a flow contraction angle that are unequal. 1. A flow path , comprising:a flow path wall defining an inner flow path surface; andan asymmetric notch defined in the flow path wall,wherein the asymmetric notch comprises a first surface and a second surface, andwherein the asymmetric notch is asymmetric about a first line extending through an intersection of the first surface with the second surface.2. The flow path of claim 1 , wherein the first surface is defined at a first angle α claim 1 , the first angle α defined with respect to the inner flow path surface claim 1 , and wherein the second surface is defined at a second angle β claim 1 , the second angle β defined with respect to a second line tangent to a bottom of the asymmetric notch.3. The flow path of claim 2 , wherein the second surface comprises a first planar segment that intersects the first surface claim 2 , a radiused segment having a radius claim 2 , and a second planar segment at a third angle γ defined with respect to a third line tangent to an intersection of the radiused segment and the second planar segment claim 2 , and wherein 0°≤γ≤20°.4. The flow path of claim 3 , wherein the ...

Self-clearing self-cutting implant

The invention relates to methods of stabilizing bone implants, comprising inserting a self-tapping implant having at least two helical grooves running in opposite directions around the implant.

ALUMINUM IMPACT EXTRUDED BOTTLE WITH THREADED NECK MADE FROM RECYCLED ALUMINUM AND ENHANCED ALLOYS

The present invention relates generally to forming a threaded neck in a metal bottle manufactured by a process known as impact extrusion. More specifically, the present invention relates to methods, apparatus and alloy compositions used in the impact extrusion manufacturing of containers and other articles with sufficient strength characteristics to allow threading the container necks to receive a threaded closure on the threaded neck. 116-. (canceled)17. An aluminum alloy for a slug used in an impact extrusion process to form a threaded metallic container , comprising:at least about 0.16 wt. % Si;at least about 0.37 wt. % Fe;at least about 0.08 wt. % Cu;at least about 0.48 wt. % Mn;at least about 0.34 wt. % Mg;at least about 0.06 wt. % Zn;at least about 0.01 wt. % Cr; anda balance being aluminum, titanium, and impurities.18. The aluminum alloy of claim 17 , wherein the aluminum alloy is blended from at least about 60% of a recycled scrap aluminum and no more than about 40% of a relatively pure aluminum alloy.19. The aluminum alloy of claim 18 , wherein the relatively pure aluminum alloy comprises at least one of a 1050 and a 1070 aluminum alloy.20. The aluminum alloy of claim 18 , wherein the aluminum alloy is blended from between about 60% and about 80% of the recycled scrap aluminum and between about 20% and about 40% of the relatively pure aluminum alloy.21. The aluminum alloy of claim 17 , comprising:no more than about 0.24 wt. % Si;no more than about 0.48 wt. % Fe;no more than about 0.15 wt. % Cu;no more than about 0.71 wt. % Mn;no more than about 0.52 wt. % Mg;no more than about 0.12 wt. % Zn;no more than about 0.04 wt. % Cr; andbetween about 0.00 wt. % Ti and about 0.04 wt. % Ti.22. The aluminum alloy of claim 17 , comprising:between about 98.15 wt. % aluminum and about 98.50 wt. % aluminum;between about 0.16 wt. % Si and about 0.20 wt. % Si;between about 0.37 wt. % Fe and about 0.41 wt. % Fe;between about 0.08 wt. % Cu and about 0.12 wt. % Cu;between about ...

Connecting Element

The invention relates to a connecting element () for connecting at least two components that are positioned one on top of the other, comprising a shaft () and a head (), which is provided with a drive (), the shaft () being formed from a base material and ending at the exposed shaft end thereof that is opposite the head (). The invention is characterised in that a tip () made of plating material is applied to the exposed shaft end, which plating material is different from the base material. 110305014345612323814343612321640523636. Connecting element ( , , ) for connecting at least two components that are positioned the one on top of the other , comprising a shaft ( , , ) and a head ( , ) , which is provided with a drive () , the shaft ( , , ) being formed from a base material and ending at its exposed end that is opposite the head ( , ) , and a tip region ( , , ) made of a plating material () is applied to the exposed shaft end , which plating material () is different from the base material.236. Connecting element according to claim 1 , wherein the plating material () is a material that is hardenable or harder than the base material.3164052. Connecting element according to claim 1 , wherein the tip region is formed as a tip ( claim 1 , claim 1 , ).4. Connecting element according to claim 1 , wherein the base material is an acid-resistant stainless steel claim 1 , or a non-ferrous metal alloy.5. Connecting element according to claim 1 , wherein the plating material at the tip is formed into its final tip shape by rolling or pressing.6. Connecting element according to claim 1 , wherein the plating material at the tip is formed into its final tip shape by machining.730. Connecting element according to claim 1 , wherein the connecting element () is a self-tapping screw.830504258. Connecting element according to claim 6 , wherein at least in at least part of its tapping region claim 6 , the self-tapping screw ( claim 6 , ) exhibits a thread ( claim 6 , ) made of plating ...

Self-tightening Fastening Apparatus for Vibrating Work-parts

A self-tightening fastening apparatus for vibrating work-parts includes a male fastener, a main female fastener, a locking female fastener, an anti-rotation female fastener, and a first compression body. The main female fastener is threadedly engaged around a first threaded-shaft section of the male fastener, wherein a head of the male fastener and the main female fastener compress the vibrating work-parts together. The locking female fastener is threadedly engaged around a second threaded-shaft section of the male fastener. The first compression body is compressed in between the main female fastener and the locking female fastener. The anti-rotation female fastener is threadedly engaged around a third threaded-shaft section of the male fastener.

ROLLED PIPE THREAD PROCESSING METHOD, ROLLING HEAD, APPARATUS, MODULE, PRODUCTION LINE, AND PRODUCT THEREOF

Provided is a method for performing an external pipe thread process on a hollow blank by at least twice rolling: firstly, the first rolling wheel group rolls the outer surface of the hollow blank into a threaded cylindrical surface or a threaded conical surface or a threaded cylindrical conical mixing surface, and secondly, the second rolling wheel group rolls again for the outer surface of the hollow blank which has processed in step 1, and rolling to form an external pipe thread; wherein the number of rolling wheels in a rolling wheel group, used in any two back-to-back rolling processes in a processing sequence, are different in parity. Further provided are various rolling head, module, apparatuses and production line for pipe thread, achieving the above processing method and having a simple structure, portability and practicality. When preforming an external pipe thread rolling process of the hollow blank, thereby improving a processing yield; in addition, the invention also provides a threaded cylindrical surface or a threaded conical surface or threaded cylindrical conical mixing surface products by the first rolling wheel group. 1. A method for rolling an external pipe thread , comprising rolling a hollow blank by a first rolling wheel group and a second rolling wheel group sequentially , wherein the first rolling wheel group comprises at least three circumferentially arranged first rolling wheels , and the second rolling wheel group comprises at least two circumferentially arranged second rolling wheels , the outer surface of the first rolling wheels have pre-formed thread , and the outer surface of the second rolling wheels have external pipe thread forming portion , andthe method includes the following steps:step 1: the first rolling wheel group rolls the outer surface of the hollow blank into a threaded cylindrical surface, a threaded conical surface, or a threaded cylindrical conical mixing surface;step 2: the second rolling wheel group rolls the outer ...

Method of producing threaded member, method of producing spark plug, and apparatus for producing threaded member

A workpiece having a first portion and a second portion is held. The first portion extends in the direction of a center axis of the workpiece, and a male thread is to be rolled on the first portion. The length of the second portion in a direction perpendicular to the center axis is longer than that of the first portion. The male thread is formed on the outer circumference of the first portion using two rolling dies through rolling. At least a first portion center axis that is a part of the center axis and corresponds to the first portion is separated in a prescribed direction from a first virtual plane containing the center axes of the two rolling dies. In the workpiece held, the first portion center axis is inclined such that its distance from the first virtual plane increases with distance from the second portion.

THREAD-ROLLING FLAT DIE FOR THREADED FASTENER, AND THREAD-ROLLING METHOD

[Problem to be Solved] A thread-rolling flat die for a threaded fastener capable of long life and a thread-rolling method using the thread-rolling flat die for a threaded fastener are provided. 1. A thread-rolling flat die for a threaded fastener , comprising a thread-rolling surface including at least a bite surface to which a workpiece of the threaded fastener is supplied , a finishing surface formed adjacent to the bite surface , and a roll-off surface formed adjacent to the finishing surface , a first partial bite surface having an inclination receding with distance from the finishing surface and an angle α of the inclination with respect to the finishing surface, the first partial bite surface being a portion for substantially forming a thread groove in a processed portion of the workpiece; and', 'a second partial bite surface continuously formed in the first partial bite surface and having an inclination receding with distance from the finishing surface and an angle β of the inclination with respect to the finishing surface, the angle β being smaller than the angle α;, 'wherein the bite surface includes at leastwherein, in the first partial bite surface and the second partial bite surface, a crest angle of a processing tooth for forming a trough bottom of the thread groove in the threaded fastener is larger than a crest angle of a processing tooth in the finishing surface,wherein a crest shape of the processing tooth gradually changes from a root side to the crest angle of the processing tooth in the finishing surface along the thread-rolling surface from a starting point of the first partial bite surface toward the finishing surface, and{'b': 1', '3', '4', '1', '3', '4, 'wherein a length L along a thread-rolling direction in the first partial bite surface, a length L along the thread-rolling direction in the finishing surface, a length L along the thread-rolling direction in the roll-off surface, and a diameter of the processed portion of the workpiece of the ...

Method for rolling external pipe threads, rolling head and device thereof

This invention provides a method for rolling an external pipe thread, a rolling head and device thereof. A rolling wheel carries out a thread rolling, wherein the thread rolling starts from a thread tail of the external pipe thread and moves towards a thread head of the external pipe thread, thereby completing the thread rolling. The rolling head of the invention comprises at least one rolling wheel arranged along a circumference, a corresponding rolling wheel axle and a corresponding rolling wheel seat; the rolling wheel is rotatably fixed to the rolling wheel seat via the rolling wheel axle; and the rolling wheel is provided with a pipe thread forming part having a thread length less than an effective thread length of the external pipe thread to be rolled. The rolling head of the invention also comprises a radial regulating device that can realize dynamic rolling and real-time whole-process regulation of radial position of the rolling wheel for the purpose of forming the taper as required by rolling process. The invention also provides rolling device including aforesaid rolling head. Solutions as provided by this invention are expected to guard against deformation to the pipe end during rolling, significantly save materials for hollowed cylindrical blank, and improve the rate of finished products.

CRACK-PROOF SCREW

A crack-proof screw includes a thread formed around a shank. A helical notch continuously and helically extends along the shank and is indented into the shank and the thread. The helical notch is proximal to but spaced apart from a tip of the shank. The notch is trapezoidal in cross section, and has a notch bottom, an open end opening at an outer peripheral surface of the shank oppositely of the notch bottom, and two opposite notch walls extending divergingly from the notch bottom to the open end. The open end is larger in width than the notch bottom. A method of making the screw is also disclosed. 1. A crack-proof screw comprising:a head;a shank axially extending from said head, and having a tip;a thread formed continuously and helically around said shank; anda helical notch continuously and helically extending along said shank and indented into said shank and said thread, said helical notch being proximal to but spaced apart from said tip, said helical notch being trapezoidal in cross section, and having a notch bottom, an open end opening at an outer peripheral surface of said shank oppositely of said notch bottom, and two opposite notch walls extending divergingly from said notch bottom to said open end, said open end being larger in width than said notch bottom.2. The crack-proof screw as claimed in claim 1 , wherein said helical notch has a length equal to at least half of a length of said thread.3. The crack-proof screw as claimed in claim 1 , wherein said helical notch has a lead angle greater than a lead angle of said thread.4. The crack-proof screw as claimed in claim 1 , wherein each of said notch walls forms a cutting edge at said open end.5. A method for manufacturing a crack-proof screw claim 1 , comprising:cutting a rod metal material with a predetermined length into a shank, and punching an end of the shank into a head; andthread rolling a metal blank by using a die assembly to form a thread that extends continuously and helically around the shank, ...

METHOD OF MANUFACTURING STEERING SHAFT

A method of manufacturing a rack bar includes: a rolling die abutment step of bringing a pair of rolling dies into abutment against an intermediate portion of a workpiece; and a ball screw groove forming step of forming a ball screw groove in the workpiece by moving the workpiece relative to the pair of rolling dies so that a region of the workpiece against which the pair of rolling dies is brought into abutment is moved from the intermediate portion toward a first end portion of the workpiece. 1. A method of manufacturing a steering shaft of a steering device , the steering shaft having a bar shape , and including a first end portion , a second end portion , and an intermediate portion formed between the first end portion and the second end portion ,the method comprising:a rolling die abutment step of bringing a rolling die into abutment against a workpiece being a material for forming the steering shaft; anda ball screw groove forming step of forming a ball screw groove in the workpiece in a first state,wherein in the rolling die abutment step, the rolling die is brought into abutment against the intermediate portion of the workpiece in the first state, andwherein in the ball screw groove forming step, the workpiece is moved relative to the rolling die so that a region of the workpiece against which the rolling die is brought into abutment is moved from the intermediate portion toward the first end portion, thereby forming the ball screw groove in the workpiece and forming the workpiece in a second state.2. The method of manufacturing a steering shaft according to claim 1 , further comprising a rolling die separation step claim 1 ,wherein in the rolling die separation step, the rolling die is separated away from the workpiece before the first end portion of the workpiece passes an entire region of the rolling die in the ball screw groove forming step.3. The method of manufacturing a steering shaft according to claim 1 , further comprising a diameter-reduced ...

Fastener with cleaning and leveling wings

Fasteners, methods of forming fasteners, and methods of securing a work piece to a substrate using a fastener. Embodiments include fasteners having a structural feature below the head. The upper extent of the structural feature is on a plane parallel to the leading surface of a fastener head. Embodiments include a washer between the head and the structural feature. The structural feature may include a cutting edge for cutting and/or reaming a portion of the work piece.

FASTENER STRUCTURE FOR FIXING ASSEMBLY, FIXING ASSEMBLY, AND METHOD OF ASSEMBLING FIXING ASSEMBLY

A fixing assembly and a fastener structure thereof are introduced. The fastener structure includes an engaging member and a mating member connected together. The fixing assembly includes a fastening member and the fastener structure. The fastening member includes sequentially connected head portion, assembling section and fastening section, while the assembling section is assembled to the engaging member. A method of assembling the fixing assembly is also introduced, according to which the engaging member is first connected to the mating member, the assembling section of the fastening member is then forced through an insertion-hole section of the engaging member to be assembled thereto, and finally, a first inner retaining section of the mating member is movably connected to an outer retaining section of a locating member, which is connected to a workpiece. Therefore, the fixing assembly and the fastener structure thereof have a simple structure and can be easily completed. 1. A fastener structure for fixing assembly being characterized in comprising an engaging member and a mating member; and the engaging member being connected to the mating member and used to engage with a fastening member.2. The fastener structure as claimed in claim 1 , characterized in that the mating member is a hollow cylindrical body or an assembly of the engaging member and the mating member is a hollow cylindrical body; and that the hollow cylindrical body internally defines a receiving space.3. The fastener structure as claimed in claim 1 , characterized in that the mating member has a first inner retaining section for movably connecting to a locating member.4. The fastener structure as claimed in claim 3 , characterized in that the first inner retaining section has a first pressing surface claim 3 , which can be any one of a flat surface claim 3 , a bevel surface claim 3 , a curved surface and a cambered surface.5. The fastener structure as claimed in claim 3 , characterized in that the ...

Anti-loosen Screw Manufacturing Method and Screw Member Produced Thereby

A screw includes a shank portion, an outer thread portion and a laterally-extruded thread portion. The shank portion has an outer circumferential surface on which to form the outer thread portion having grooves. In a thread-rolling process, the laterally-extruded thread portions is formed by laterally extruding an inclined wall of one groove with respect to a longitudinal direction thereof such that a laterally-extruded portion is protruded in an adjacent groove and is tightly engaged with an inclined surface of a groove of inner threads of a screw hole 1. An anti-loosen screw manufacturing method comprising:combining a main die plate with a protruded die plate to form a combined die plate;utilizing the main die plate of the combined die plate to execute a thread-rolling process on an outer circumferential surface of a shank portion to form an outer thread portion which includes a plurality of grooves; andutilizing the protruded die plate of the combined die plate to execute an extrusion-forming process to form at least one or a plurality of laterally-extruded thread portions on a predetermined groove of the outer thread portion in the thread-rolling process;wherein each of the laterally-extruded thread portions is formed by laterally extruding a first inclined wall of the predetermined groove of the outer thread portion with respect to a longitudinal direction thereof such that a first laterally-extruded portion is protruded in a first adjacent groove of the predetermined groove; andwherein the laterally-extruded thread portion widens a width of the predetermined groove such that the first laterally-extruded portion is tightly engaged with a first inclined surface of a first groove of inner threads of a screw hole.2. The anti-loosen screw manufacturing method as defined in claim 1 , wherein each of the laterally-extruded thread portions is further formed by laterally extruding a second inclined wall of the predetermined groove of the outer thread portion with ...

ROLL FORMING MACHINE WITH RECIPROCATING DIES

A reciprocating die roll forming machine for forming a pattern such as a thread form on the outer surface of a cylindrical blank includes at least one set of reciprocating dies operating upon the blank which rotates in place. The machine includes a slide and bearing combination to support the dies belt driven by a servo-motor controlled by a central processing unit. Mechanism is provided to deliver and position a blank for engagement by the dies. In one form, the machine includes multiple die sets to produce multiple parts during one die reciprocation cycle. In another form, the machine employs separate drive mechanisms to independently drive each die of a set. 1. A reciprocating die pattern forming machine that is configured to form a pattern on a cylindrical surface of a blank having a cylindrical pattern receiving surface , said machine comprising:a base;a pair of slidable members reciprocal on said base and movable along and through at least a portion of a length of the base along paths parallel to and on opposite sides of a longitudinal plane;at least one pair of pattern forming dies each having a leading edge and a trailing edge and a pattern forming face mounted on said slidable members in facing relation;at least one mechanism to deliver and position a blank between said leading edges of said dies when said leading edges of said dies are spaced apart a distance greater than the diameter of the cylindrical pattern receiving surface;a drive mechanism for said slidable members to reciprocate said dies between fully retracted and fully inserted positions,said faces of said dies arranged to simultaneously engage the cylindrical pattern receiving surface of the positioned blank on diametrically opposite surfaces of said cylindrical pattern receiving surface,axial translation of said dies from said fully retracted position to said fully inserted position causing the blank to rotate about its longitudinal center between said pattern forming faces to impart said ...

Positioning and clamping system for thread rolling

The present invention is a die positioning system for use in positioning mobile or fixed dies. The system includes a pair of key bars, a pair of key disc inserts, a set of key discs, and a set of disc backers. The key bars and key discs serve to offset manufacturing dies or die holders. Using key bars and/or key discs from different pairs of key bars and/or sets of key discs also allows for precise angulation of the dies or die holders. The key discs are held in place between the die and die holder, or between the die holder and key base, by the key disc inserts and angled (if feasible) by the disc backers. The key bars, located between the key disc inserts and the die or die holder allow additional offset of the die or die holder. The solid, stacked configuration of the key bars and key discs prevents the die or die holder from gradually or suddenly losing its positioning.

THREAD ROLLING HEAD

A thread rolling head comprises a bearing unit, in which at least two profile rollers, preferably at least three profile rollers, are rotatably mounted, and a shank section coupled to the bearing unit. Adjacent profile rollers delimit an insertion section into which a workpiece to be machined can be inserted. The bearing unit is built from at least two modules each forming a functional unit, wherein the modules each have a fastener through which modules can be connected together and can be exchanged for other modules also each forming a functional unit. One of the modules has fasteners for connecting to corresponding fasteners of the shank section. 1. A thread rolling head , comprising:a bearing unit in which at least two profile rollers are rotatably mounted; anda shank section coupled to the bearing unit; wherein:adjacent ones of the at least two profile rollers delimit an insertion section into which a workpiece to be machined can be inserted;the bearing unit is built from at least two modules, each module forming a functional unit and having a module fastening device through which they can be connected together;each module can be exchanged for other modules also each forming a functional unit; andone of the at least two modules includes a fastener for connecting to a corresponding fastener of the shank section.2. The thread rolling head according to claim 1 , wherein the module fastening devices of adjacent modules of the at least two modules define a unique fastening position of the adjacent modules to each other.3. The thread rolling head according to claim 1 , wherein the module fastening devices of adjacent modules of the at least two modules define exactly two fastening positions of the adjacent modules to each other.4. The thread rolling head according to claim 1 , wherein:a first module of the bearing unit is a profile roller cage holding the at least two profile rollers;a second module of the bearing unit is a spring housing having a spring arranged in ...

Nut

In order to optimize a nut and a method for the production of a nut, comprising a nut body which is provided or can be provided with an internal thread and has a polygonal section with a polygonal outer contour which has, on the one hand, edge areas and, on the other hand, key faces which are located between the edge areas and extend in key face planes extending in a manner conforming to standards, in such a manner that it has mechanical properties which are as ideal as possible with as low a weight as possible, it is suggested that the nut body have a plurality of recesses which extend into the nut body in the direction of the bore proceeding from the respective key face planes. 2. Nut as defined in claim 1 , wherein recesses extend into the nut body each proceeding from key face planes located opposite one another.3. Nut as defined in claim 1 , wherein a recess extends into the nut body proceeding from each key face plane of the polygonal section.4. Nut as defined in claim 1 , wherein the recess extends from the respective key face plane as far as a thread-bearing casing surrounding the internal thread in a stabilizing manner.5. Nut as defined in claim 4 , wherein the thread-bearing casing has claim 4 , proceeding from an external diameter of the internal thread claim 4 , a radial minimum thickness of 0.05 times the external diameter of the internal thread.6. Nut as defined in claim 1 , wherein the nut body has a first end face designed as a pressure side with a pressure surface and a second end face facing away from the pressure side.7. Nut as defined in claim 6 , wherein the recess extends as far as the second end face.8. Nut as defined in claim 6 , wherein the recess extends as far as the pressure side.9. Nut as defined in claim 6 , wherein the recess extends from the one end face to the other end face only over a partial section of the extension of the nut body.10. Nut as defined in claim 1 , wherein the recess extends as far as a pressure base provided on the ...

THREADED FASTENER

A threaded fastener is provided in which a head bearing surface can be in full intimate contact with a counterpart. The threaded fastener is provided with a head (), and a screw shank () extending from the head (). The screw shank () is provided with a parallel thread portion () having a complete screw thread formed therein, a neck portion () having no screw thread, a transition thread portion () having an incomplete screw thread formed to extend from the parallel thread portion () toward the neck portion () with its root diameter being the same as that of the complete screw thread and with its thread height gradually becoming lower to reach the neck portion, and an underneck rounded portion () formed in a corner angle portion between the neck portion () and a head bearing surface (), wherein the neck portion () is work hardened with its diameter being narrowed from a root diameter of the parallel thread portion (). 1. A threaded fastener which is provided with a head and a screw shank extending from said head , wherein said screw shank is provided with a parallel thread portion having a complete screw thread formed therein , a neck portion having no screw thread , a transition thread portion having an incomplete screw thread formed to extend from said parallel thread portion toward said neck portion with its root diameter being the same as that of said complete screw thread and with its thread height gradually becoming lower to reach said neck portion , and an underneck rounded portion formed in a corner angle portion between said neck portion and a head bearing surface ,whereinsaid neck portion is work hardened with its diameter being slenderly narrowed from the root diameter of said parallel thread portion; andthe strength of said neck portion is made to be higher than that of each of the thread portions so that a fracture position in the case where said screw shank is fractured is made to be in said parallel thread portion.2. The threaded fastener according to ...

DUAL-THREADED SCREW STRUCTURE

The dual-threaded screw structure has a first thread (S) and a second thread (S) with various leads formed on the dual-thread portion and has a function of preventing loosening without insufficiency in strength of the dual-thread portion. This dual-thread portion is composed of a first thread (S) consisting of a coarse thread with a standard pitch P and a specific second thread (S). The second thread (S) is formed continuously on the thread ridge of the first thread (S). The second thread (S) has a sectional shape of this thread groove same as or substantially same as the first thread (S), has a same twisting direction as the first thread (S) and is a multi-threaded thread having threads with a triangular sectional shape and having a lead (L=n*P) a determined number (n)-times of a standard pitch P. 1. A dual-threaded screw structure having two kinds of threads formed on the shank , said dual-threaded screw structure comprising:a first thread formed on the shank with a pitch to have a triangular sectional shape of the thread ridge, anda second thread formed on said thread ridge successively in the same twisting direction as said thread ridge to have a triangular sectional shape of the thread ridge, the second thread being a thread in which the number of threads is less by one thread or more than a multi-threaded thread having a lead a determined number (n)-times of the pitch of said thread ridge.2. The dual-threaded screw structure according to claim 1 ,wherein said determined number (n) is an integer number-times of the pitch.wherein the lead of said second thread is two-times of the pitch of said thread ridge, andthe number of threads of said multi-threaded thread is two threads and one-thread of said thread is formed.3. The dual-threaded screw structure according to claim 1 ,wherein the lead of said second thread is three-times of the pitch of said thread ridge, andthe number of threads of said multi-threaded thread is three threads and one-thread or two-threads ...

SELF-THREADING FASTENER

The embodiments described in this paper relate generally to a fastener configured to reduce a risk of doing damage to a high cost component. Various embodiments of fasteners configured to be threaded during insertion are described. This is accomplished by selecting a material for an engaging portion of the fastener that is soft enough to yield to a set of threads to which it is driven into. In this way, a complementary threading pattern is formed on an exterior surface of the fastener as it is twisted against threading of the high cost component to which the fastener is configured to be coupled. 1. A method for securing a first component to a second component , the method comprising:arranging a first end of a fastener through an opening in the first component and against a threaded bore disposed in the second component; anddriving the first end of the fastener against a plurality of threads disposed along an inside surface of the threaded bore such that an outer surface of the fastener is deformed against the plurality of threads, the deformation of the outer surface forming a threading pattern along the outer surface of the fastener that is complementary with the plurality of threads,wherein the threading pattern interacts with the plurality of threads to secure the first end of the fastener within the threaded bore of the second component, and wherein the outer surface of the fastener is not rigid enough to cause damage to the plurality of threads.2. The method as recited in claim 1 , wherein the driving of the first end of the fastener against the plurality of threads comprises twisting the first end of the fastener against the plurality of threads.3. The method as recited in claim 1 , wherein the driving of the first end of the fastener against the plurality of threads comprises vertically driving the first end of the fastener into the plurality of threads.4. The method as recited in claim 2 , wherein the interaction between the plurality of threads and the ...

Method, module, and apparatus for roll-processing external pipe thread, and external pipe thread production line

Provided is a method for performing an external pipe thread process on a hollow blank by at least twice rolling, wherein amount of rolling wheels in a rolling wheel set, used in any two back-to-back rolling processes in a processing sequence, are different in parity. Further provided are various roll-processing modules and corresponding rolling apparatuses, achieving the above processing method and having a simple structure, portability and practicality. A hollow blank is not liable to deform when performing an external pipe thread rolling process thereon, thereby improving a processing yield.

ALUMINUM IMPACT EXTRUDED BOTTLE WITH THREADED NECK MADE FROM RECYCLED ALUMINUM AND ENHANCED ALLOYS

The present invention relates generally to forming a threaded neck in a metal bottle manufactured by a process known as impact extrusion. More specifically, the present invention relates to methods, apparatus and alloy compositions used in the impact extrusion manufacturing of containers and other articles with sufficient strength characteristics to allow threading the container necks to receive a threaded closure on the threaded neck. 1. A method of forming a slug of a recycled aluminum alloy for use in manufacturing a metallic bottle in an impact extrusion process , the recycled aluminum alloy of the slug having a mechanical strength such that integral threads can be formed on the metallic bottle , comprising:melting a scrap aluminum material;blending the melted scrap aluminum material with a first aluminum alloy to form the recycled aluminum alloy, wherein the blend comprises between about 60 wt. % and about 80 wt. % of the scrap aluminum material;casting the recycled aluminum alloy into a slab;rolling the slab to a specified thickness;cooling the slab; andpunching a slug from the cooled slab.2. The method of claim 1 , wherein the first aluminum alloy comprises at least one of a 1050 and a 1070 aluminum alloy.3. The method of claim 1 , wherein the scrap aluminum material comprises:between about 0.20 wt. % Si and about 0.32 wt. % Si;between about 0.47 wt. % Fe and about 0.59 wt. % Fe;between about 0.10 wt. % Cu and about 0.22 wt. % Cu;between about 0.78 wt. % Mn and about 0.90 wt. % Mn;between about 0.54 wt. % Mg and about 0.66 wt. % Mg;between about 0.06 wt. % Zn and about 0.18 wt. % Zn;between about 0.00 wt. % Cr and about 0.08 wt. % Cr; andbetween about 0.00 wt. % Ti and about 0.08 wt. % Ti.4. The method of claim 1 , further comprising adding a concentration of between about 1 lb/ton to about 2.6 lbs/ton of titanium boride to the blend.5. The method of claim 1 , wherein the recycled aluminum alloy comprises:between about 0.16 wt. % and about 0.24 wt. % Si; ...

THREAD ROLLING HEAD WITH ENERGY GENERATION APPARATUS

A thread rolling head comprises at least one roller holder configured to retain rollers that are configured to form a screw thread on a workpiece. The rollers are configured to rotate in the course of the screw thread formation. The thread rolling head further comprises an energy generating apparatus integrated into the thread rolling head that is configured to generate electrical energy when the thread rolling head is operating. 1. A thread rolling head comprising:at least one roller holder configured to retain rollers that are configured to rotate to form a screw thread on a workpiece; andan energy generating apparatus integrated into the thread rolling head configured to generate electrical energy when the thread rolling head is operating.2. The thread rolling head according to claim 1 , wherein the energy generation apparatus generates electrical energy from movement of at least one component of the thread rolling head during operation of the thread rolling head.3. The thread rolling head according to claim 2 , wherein the energy generation apparatus generates electrical energy from the rotation of the rollers.4. The thread rolling head according to claim 2 , wherein the energy generation apparatus generates electrical energy by means of induction.5. The thread rolling head according to claim 4 , wherein the energy generation apparatus comprises:at least one electrical coil; andat least one magnet that is configured to rotated relative to the at least one electrical coil when the at least one component of the thread rolling head is moved during operation of the thread rolling head.6. The thread rolling head according to claim 5 , wherein the at least one component of the thread rolling head is a gear wheel configured to couple the rollers together.7. The thread rolling head according to claim 1 , wherein the thread rolling head is a tangential thread rolling head.8. The thread rolling head according to claim 1 , wherein the energy generation apparatus further ...

METHOD FOR MANUFACTURING STEERING SHAFT OF STEERING DEVICE

A method for manufacturing a steering shaft of a steering device includes: a reduced-diameter section forming process in which a second-phase member is formed from a first-phase member by forming a reduced-diameter section in the first-phase member; and a ball screw groove forming process in which a third-phase member is formed from the second-phase member by forming a ball screw groove in the second-phase member by rolling. 1. A method for manufacturing a steering shaft of a steering device , the method comprising:a reduced-diameter section forming process in which a second-phase member is formed from a first-phase member being a metal rod, by forming a reduced-diameter section in the first-phase member; anda ball screw groove forming process in which a third-phase member is formed from the second-phase member by forming a ball screw groove in the second-phase member,wherein:the reduced-diameter section has a radius measured from a reference axis which is smaller than a material radius, wherein the reference axis is an axis that is parallel with a longitudinal direction of the first-phase member and extends through a center of the first-phase member at a cross section perpendicular to the longitudinal direction of the first-phase member, and wherein the material radius is a radius of an outer circumference of the first-phase member which is measured from the reference axis;in the reduced-diameter section forming process, the reduced-diameter section is formed in a first region that is a predetermined region including a first end of the first-phase member, wherein the first-phase member includes the first end and a second end in the longitudinal direction of the first-phase member; andin the ball screw groove forming process, the ball screw groove is formed in a second region of the second-phase member by rolling, wherein the second region is a predetermined region outside of the first region in a direction of the reference axis.2. The method as claimed in claim 1 , ...

ROLL DIE

A roll die for use with a thread roiling apparatus for roll forming threads on a part is disclosed. The roll die generally comprises a stationary roll die having a first predetermined thread on one surface thereof. The roll die also comprises a moving roll die having a second predetermined thread on a first predetermined portion of a surface thereof and a third predetermined thread on a second predetermined portion of the surface of the moving roll die. The moving roll die also includes at least one ramp arranged between a second predetermined thread and a third predetermined thread. The roll die may be capable of roll forming multiple threads on a fastener or threaded blank or part in a single pass. 1. A roll die for use with a thread rolling apparatus for roll forming threads or a part , said roll die comprising:a stationary roll die having first predetermined threads on one surface thereof;a moving roll die having second predetermined threads on a first predetermined portion of a surface thereof;said moving roll die having third predetermined threads on a second predetermined portion of said surface of said moving roll die; andat least one ramp arranged between one of said second predetermined threads and one of said third predetermined threads.2. The roll die of wherein said stationary roll die and said moving roll die are flat roll dies.3. The roll die of Wherein said first predetermined threads are a coarse thread.4. The roll die of wherein said second predetermined threads are a coarse thread.5. The roll die of Wherein said third predetermined threads are a fine thread.6. The roll die of Wherein at least one ramp is generally radial of flat in shape claim 1 , said ramp having a predetermined length.7. The roll die of further comprising a plurality of ramps.8. The roll die of wherein said first predetermined threads are arranged on said surface about a central location.9. The roll die of wherein said third predetermined threads are offset from said second ...

LOCKING NUT ASSEMBLY

A locking nut includes a first nut, including a nut base and a screwing portion protruding outward from a face of the nut base, where the screwing portion is provided with a plurality of longitudinal sectional grooves in a spaced manner, such that the screwing portion is formed with a plurality of screwing claw bodies, and a first inner threaded wall is provided on each of inner walls of the screwing claw bodies, and is used for threadedly connecting to a bolt; and a pressing ring, mounted and located outside the screwing portion of the first nut, where an inner wall of the pressing ring includes a pressing inner-wall for pressing outer walls of the screwing claw bodies of the screwing portion. 1. A locking nut assembly , for threadedly connecting to a bolt , the locking nut assembly comprising:a first nut, comprising a nut base and a screwing portion protruding outward from a face of the nut base, wherein the screwing portion is provided with a plurality of longitudinal sectional grooves in a spaced manner, such that the screwing portion is formed with a plurality of screwing claw bodies, a first inner threaded wall is provided on each of inner walls of the screwing claw bodies, and is used for threadedly connecting to a bolt, and outer walls of the screwing claw bodies are formed with symmetrical outward-protruding deformations; anda pressing ring, mounted and located outside the screwing portion of the first nut, wherein an inner wall of the pressing ring comprises a pressing inner-wall for pressing the outer walls of the screwing claw bodies of the screwing portion.2. The locking nut assembly according to claim 1 , wherein an outer wall of the screwing portion of the first nut is a tapered outer wall claim 1 , and the pressing inner-wall of the pressing ring is a tapered pressing inner-wall matching the tapered outer wall.3. The locking nut assembly according to claim 1 , wherein the pressing ring is a second nut claim 1 , an inner wall of the second nut ...

Pull-up bolt assembly

In combination, a manway cover and a manway flange having one or more bolt opening(s) and a pull-up bolt assembly adapted to be used for supporting a hinge component to the manway cover, the manway flange, or both, where the pull-up bolt assembly having a pull-up bolt member, a nut component, a tapered member, and an expandable friction member, where one or more structures selected from a thread, a ridge and/or a groove disposed on an outside surface of the expandable friction member and the one or more bolt opening(s) having an inside surface adapted for mating with the corresponding one or more structures of the expandable friction member whereby, when the pull-up bolt assembly is engaged within the one or more bolt opening(s), the one or more structures aligns with the corresponding inside surface of the one or more bolt opening(s). 1. In combination , amanway cover and a manway flange wherein each of the manway cover and the manway flange has one or more bolt opening(s) and a pull-up bolt assembly adapted to be used for supporting a hinge component to the manway cover , the manway flange or both , wherein the pull-up bolt assembly has a pull-up bolt member , a nut component , a tapered member , and an expandable friction member , the combination comprising:one or more structures selected from the group consisting of a thread, a ridge and a groove disposed on an outside surface of the expandable friction member, andone or more of the bolt opening(s) having an inside surface adapted for mating with the corresponding one or more structures of the expandable friction member whereby, when the pull-up bolt assembly is engaged within the one or more bolt opening(s), the one or more structures of the expandable friction member aligns with the corresponding inside surface of the one or more bolt opening(s) and securely fixes the one or more structures with the mating inside surface of the bolt opening.2. The pull-up bolt assembly of claim 1 , wherein the one or more ...

FRICTIONALLY DAMPED FASTENERS AND METHODS OF MANUFACTURING THE SAME

A method and system for increasing damping capacity in a mechanical fastener by utilizing dry friction between individual wires of a sheathed rope is disclosed. For metal fasteners, the sheathed rope is inserted loosely into a thick-walled metal tube. The tube is then rolled to reduce the tube diameter, thereby uniformly embedding the rope into the tube material. The tube is then subjected to either cold or hot forming. After forming, the fastener blank may be threaded. For composite or plastic fasteners, the sheathed rope includes insert locators attached to the sheathing. The sheathed rope having the insert locators is placed in the mold cavity prior to the polymerizable material being injected into the mold. Regardless of the embodiment, the resulting fastener has increased damping due to the dry inter-wire friction within the embedded rope which develops between the surfaces of individual wires upon dynamic loading of a fastened joint. 1. A vibration-damping fastener comprising:a body having a first end, a second end and a long axis;a vibration-damping metal rope embedded in said body along said axis between said first and second ends, said rope comprising a plurality of wires positioned next to one another and a metal sheathing encasing said plurality of wires, whereby sliding movement of the surfaces of the wires relative to one another dampens resonant vibration of the fastener.2. The vibration-damping fastener of claim 1 , wherein said first end is a head portion and said second end is a fastening portion.3. The vibration-damping fastener of claim 2 , wherein said fastening portion is threaded.4. The vibration-damping fastener of claim 1 , wherein said metal sheathing includes at least one material-passing perforation.5. The vibration-damping fastener of claim 1 , further including at least one insert locator extending from said metal sheathing.6. The vibration-damping fastener of claim 5 , wherein elongated fastening portion has an outer surface and wherein ...

RIVET STUD BOLT AND PANEL JOINT STRUCTURE OF THE SAME

A rivet stud bolt is disclosed. A rivet stud bolt for mounting an element to at least one panel includes a bolt portion to which the panel is assembled, a flange integrally formed to an end of the bolt portion, and a rivet portion integrally connected to the flange, in which at least two slits are formed, and the rivet portion is plastically deformed and connected to the panel. 1. A rivet stud bolt for mounting an element to at least one panel , the rivet stud bolt comprising:a bolt portion to which the panel is assembled;a flange integrally formed to an end of the bolt portion; anda rivet portion integrally connected to the flange, in which at least two slits are formed, and the rivet portion is plastically deformed and connected to the panel.2. The rivet stud bolt of claim 1 , wherein:the rivet portion is formed as a cylinder shape shank;the rivet portion includes a connecting end connected to the flange and a free end being an opposite end of the connecting end; andthe slits are extended from the free end to the connecting end of the rivet portion.3. The rivet stud bolt of claim 2 , wherein a length of the slit is shorter than that of the rivet portion claim 2 , and the slits are circumferentially disposed at the rivet portion at a constant interval.4. The rivet stud bolt of claim 2 , wherein the rivet portion comprises:a first portion integrally connected to the flange and having a circular cross-section; anda plurality of second portions integrally connected to the first portion and disposed between the slits.5. The rivet stud bolt of claim 4 , wherein the slit is provided with a triangular groove at the first portion claim 4 , and the groove is connected to a space between the second portions.6. The rivet stud bolt of claim 1 , wherein a rotation preventing portion is formed to an edge of the flange.7. The rivet stud bolt of claim 6 , wherein the rotation preventing portion is formed as teeth continuously formed to the edge of the flange.8. The rivet stud bolt ...

COLD ROLLING MACHINE AND METHOD FOR PRODUCING A PROFILE ON A WORKPIECE

A cold rolling machine and method for producing a profile on a workpiece. The cold rolling machine having two constructed tool units. Each tool unit has at least one rolling rod extending in the longitudinal direction, a tool slide, a slide drive device, a pivoting carrier and a pivot drive. The at least one rolling rod is fastened to the tool slide and can be moved in the longitudinal direction by the slide drive device. The pivoting carrier can be pivoted about a pivot axis extending in the longitudinal direction by a pivot drive. The tool slide is arranged on the pivoting carrier. An angle of inclination can thereby be set between the two rolling rods, which angle of inclination can have, for example, a value of 0 degrees to 2.0 degrees or to 0.2 degrees. Conical profiles can thereby be produced in the workpiece. 1. A cold rolling machine , comprising:a machine frame, the machine frame having two tool units, wherein each tool unit comprises:at least one cold rolling rack having a cold rolling rack profile and extending along a longitudinal direction,a tool slide that carries the at least one cold rolling rack and that is linearly movably supported in longitudinal direction by a slide support device,a slide drive device that is configured to move the tool slide in the longitudinal direction,a pivoting carrier that is pivotably supported on the machine frame around a pivot axis and on which a slide support device and the tool slide with the at least one cold rolling rack is arranged, wherein the pivot axis extends in longitudinal direction, anda pivot drive that is configured to pivot the pivoting carrier with the tool slide and the at least one cold rolling rack such that the cold rolling rack profile of the cold rolling rack includes an inclination angle in a plane orthogonal to the longitudinal direction.2. The cold rolling machine according to claim 1 , wherein a control device for controlling the pivot drive of each tool unit is provided and configured to ...

METRIC SELF-TAPPING LOCKING SCREW AND THE MANUFACTURING METHOD THEREOF

A metric self-tapping locking screw comprises a screw head which is connected to a thread locking body by a screw rod. The thread locking body and the self-tapping tip are provided with a screw thread on the surface. The self-tapping tip is arranged at the root of the thread locking body; the screw thread adopts the basic structure of the standard ordinary triangular thread. The flank angle back to the fastened surface is 15-20° and the flank angle of the screw thread facing the fastened surface is 30°. The metric self-tapping locking screw in the Invention make the installed parts to be fastened have higher axial clamping force and static loosing moment, which solves the attenuation problem of axial clamping force and static moment of fastened parts. 1. A metric self-tapping locking screw , comprising a screw head , a screw rod , a thread locking body , a self-tapping tip and a screw thread; the screw head is connected to the thread locking body with the screw rod; the thread locking body and the self-tapping tip are provided with the screw thread on the surface; the self-tapping tip is arranged at the root of the thread locking body; the screw thread adopts the basic structure of the standard ordinary triangular thread; a flank angle of the screw thread back to the fastened surface is 15-20° and another flank angle of the screw thread facing the fastened surface is 30°; a crest of the screw thread is in a plane transition structure or a natural circular arc transition structure.2. The metric self-tapping locking screw according to claim 1 , wherein the screw thread is divided into eight equal parts by eight mean lines; the eight mean lines include one-eighth line claim 1 , two-eighth line claim 1 , three-eighth line claim 1 , four-eighth line claim 1 , five-eighth line claim 1 , six-eighth line claim 1 , seven-eighth line and eight-eighth line; the intersection of the four-eighth line and the crest is a first crossing point; the intersection of the two-eighth line ...

TANGENTIAL THREAD ROLLING HEAD

The invention relates to a tangential thread rolling head comprising two fork-like rolling head arms each rotatably coupled with a thread roll by an axle. The thread rolls respectively engage with a pinion and can be pushed laterally into an assembled position into the rolling head arms before installation of axles, in which one of the axles can be pushed into a bearing bore hole of the thread rolls. The thread rolls and the pinions have interacting catches that are configured such that each of the thread rolls can only be pushed laterally into the assembled position in a single defined rotary position. 1. A tangential thread rolling head comprising:two fork-like rolling head arms;two thread rolls, each having a bearing bore hole and one or more catches, each thread roll is rotatably mounted on an axle to the two fork-like rolling head arms, the two thread rolls are configured to be laterally pushed into an assembled position on the two fork-like rolling head arms before installation of each axle, each axle configured to be inserted into the bearing bore hole of one of the two thread rolls; andtwo pinions having one or more catches, wherein each of the two pinions is configured to engage a corresponding thread roll,wherein the catches of the thread rolls and the pinions are configured to interact with each other such that each of the thread rolls can only be pushed laterally into the assembled position in a single defined rotary position, and wherein the catches of the thread rolls are configured such that each of the catches of the two pinions can only interact with the catches of the corresponding thread roll.2. The tangential thread rolling head according to claim 1 , wherein the one or more catches of the two pinons are complimentary to the catches of a respective corresponding thread roll.3. The tangential thread rolling head according to claim 1 , wherein the catches on the thread rolls are disposed opposite each other and the catches on the pinions are ...

TANGENTIAL THREAD ROLLING HEAD

The invention relates to a tangential thread rolling head including two rolling head arms having a thread roll rotatably mounted on an axle. The thread rolls are configured to engage with a gear and be pushed laterally into an assembled position into the rolling head arms before the installation of the axles and the axles can be pushed into a bearing bore hole of the thread rolls. The two thread rolls have identical thread profiles that are offset with respect to each other when the thread rolls are in the assembled position. 1. A tangential thread rolling head comprising:two thread roll arms;two thread rolls having identical circumferentially disposed thread profiles, each thread roll defining a bearing bore hole and configured to be rotatably mounted on an axle, wherein each thread roll engages a gear coupling the thread roll and can be pushed laterally into an assembled position into the rolling head arms before installation of the axle, and wherein one of the axles can be pushed into the bearing bore hole of a thread roll; anda roll engagement means configured to engage a gear engagement means of the gear, the roll engagement means and the gear engagement means configured to only allow the two thread rolls to be installed in a single defined rotary position, wherein the single defined rotary position of the two thread rolls offsets the identical circumferentially disposed thread profiles with respect to each other.2. The tangential thread rolling head according to claim 1 , wherein the roll engagement means are formed by catches of the thread rolls and the gear engagement means are formed by catches of pinions of the gear.3. The tangential thread rolling head according to claim 2 , wherein the catches of the thread rolls and the catches of the pinions are complementary to each other.4. The tangential thread rolling head according to claim 2 , wherein the thread rolls and the pinions are disposed on a common axle.5. The tangential thread rolling head according to ...

Cylindrical Tool Matching System

A die matching system which is preferably implemented in die rolling machinery for fasteners employs witness or reference marks on each of the dies. An eddy current sensor is employed to sense the witness marks and to detect change in the relative position of the witness mark and hence the position of the rotatable dies. The change in position is then processed and a signal is transmitted to servo motors to change the relative position of the dies to compensate for the position changes continuously during the operation of the die rolling machinery. In one preferred form, the witness mark is in the form of a recess milled into the bottom end surface of the cylindrical die. 1. A machine tool system including tools for serially cold forming workpieces comprising:a first rotatable tool having a first die which engages a workpiece;a second rotatable tool having a second die which engages said workpiece and having a reference feature;a sensor which senses the position of said reference feature and generates a matching signal;a processor which receives said matching signal and generates a positioning signal; anda positioner which receives said positioning signal and adjusts the relative position of said first and second dies to match said dies.2. The machine tool system of wherein said first and said second dies are cylindrical dies.3. The machine tool system of wherein said dies each define a helical thread form and said reference feature comprises a mark disposed at a pre-established distance from the start of the helical thread form.4. The machine tool system of wherein said positioner comprises a servo motor which adjusts the position of one of said dies.5. The machine tool system of wherein said first and second tools engage a workpiece to produce a finished fastener.6. The machine tool system of further comprising a third tool comprising a cylindrical die which has a reference feature.7. The machine tool system of wherein said sensor is an eddy current sensor.8. The ...

FORM-ROLLING DIE STRUCTURE AND FORM-ROLLING METHOD FOR COMPOUND SCREW

[Problem] The purpose of the present invention is to provide a form-rolling die and form-rolling method for a compound screw that use a cylindrical material to be threaded, enable the high-precision mass production of compound screws having a right-hand thread portion and a left-hand thread portion on the same region, do not cause rolling defects such as slips, and in which blockages do not occur even in the unlikely event of shavings being generated. [Solution] A form-rolling die structure is provided with die members which are pressed against a material to be threaded and which have rigid surfaces that are relatively displaced. The die members are equipped with a plurality of independent concave portions which form a substantially parallelogram shape when viewed from the normal of a virtual surface obtained by connecting the outermost portions of each of the rigid surfaces, and which are recessed from the virtual surface. Two of the corners at the sites corresponding to the four corners of the substantially parallelogram-shape of the concave portions are rounded. The periphery of each concave portion in the cross-section along the direction of the normal is rounded along the periphery of the substantially parallelogram shape. The concave portions form a substantially truncated-pyramid shape. The sites equivalent to the ridge lines of the concave portions are rounded in cross-sectional view perpendicular to the ridge line, and bases () are provided in the deepest sites (). 1. A form-rolling die structure for a compound screw , comprising:die members pressed against a screw material and having rigid surfaces that are relatively displaced,wherein each of the die members is provided with a plurality of independent concave portions that forms a substantially parallelogram shape when viewed from the normal of a virtual surface obtained by connecting outermost portions of the rigid surfaces and is recessed from the virtual surface, andat least two corners corresponding ...

ROLLING HEAD FOR ROLLING PIPE THREADS, APPARATUS AND PIPE COLUMN BLANK MACHINED BY THE APPARATUS

A rolling head for rolling pipe threads includes at least two rolling wheels and a rolling wheel seat for positioning the rolling wheels, in which the rolling wheel includes a rolling wheel body and a rolling wheel axle, the rolling wheel body includes a rolling wheel pipe thread forming portion, an axial movement space is present in a direction along the rolling wheel axle of the rolling wheel relative to the rolling wheel seat, an axial distance of the axial movement space is 0.5 thread pitch to 1 thread pitch of a corresponding thread of the rolling wheel pipe thread forming portion. 1. A rolling head for rolling pipe threads , comprisingat least two rolling wheels and a rolling wheel body and', 'wherein the rolling wheel body comprises a rolling wheel pipe thread forming portion, characterized in that, an axial movement space is present in a direction along the rolling wheel axle of the rolling wheel body relative to the rolling wheel seat, an axial distance of the axial movement space is 0.5 thread pitch to 1 thread pitch of a corresponding thread of the rolling wheel pipe thread forming portion.', 'a rolling wheel axle,'}], 'wherein the rolling wheel comprises'}, 'a rolling wheel seat for positioning the rolling wheels,'}2. The rolling head for rolling pipe threads according to claim 1 , characterized in that claim 1 , a radial movement space is present in a radial direction along the rolling wheel axle of the rolling wheel body relative to the rolling wheel seat claim 1 , a radial distance of the radial movement space is no more than 0.5 thread pitch of a corresponding thread of the rolling wheel pipe thread forming portion.3. The rolling head for rolling pipe threads according to claim 2 , characterized in that claim 2 , the axial movement space and the radial movement space are achieved through a structure selected from the group consisting of:a) a floating connection between the rolling wheel and the rolling wheel seat;b) a floating connection between the ...

R-THETA TABLE APPARATUS AND PROCESSING APPARATUS OF INTERNAL THREAD

There is provided an R-θ table apparatus which freely movies one table on a plane in the forward-and-rearward and leftward-and-rightward directions and in the rotational direction. The R-θ table apparatus changes a horizontal distance between a center line of a main axis of a driving apparatus and the action point by elevating an elevating base, and a table is moved to an arbitrary position without rotating along a guide member. 1. An R-θ table apparatus comprising:a table which is provided with a through hole having a bearing;a guide member which holds the table to be horizontally freely movable;a driving apparatus which is provided with an action axis inserted being inclined to the bearing, and drives the action axis to be freely rotated and stopped;an elevating base which elevates the driving apparatus;an elevating apparatus which elevates the elevating base, and changes a position of an action point at which the action axis and the bearing are engaged with each other; anda base which is provided with a post that guides the elevating base and the guide member, and mounts the elevating apparatus,wherein the horizontal distance between a center line of a main axis of the driving apparatus and the action point is changed by elevating the elevating base, and the table is moved to an arbitrary position without rotating along the guide member.2. The R-θ table apparatus according to claim 1 ,wherein the table is provided with a plurality of through holes provided with the bearing,wherein each of the action axes is inserted into each of the through holes, andwherein each of the action axes is synchronously operated.3. The R-θ table apparatus according to claim 1 ,wherein the bearing is a spherical bearing.4. The R-θ table apparatus according to claim 1 ,wherein the driving apparatus and the elevating apparatus are a servo motor or a stepping motor.5. A processing apparatus of an internal thread comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the R-θ table ...

SELF-TAPPING SCREW AND METHOD OF MANUFACTURING THE SAME

A self-tapping screw according to the present invention includes a head and a shank extending from the head. The shank includes a cylindrical shank immediately below the head and a truncated conical shank following an end of the cylindrical shank, the cylindrical shank is provided with a plurality of first external threads, the truncated conical shank is provided with a plurality of second external threads following the first external threads, and a peak of each of the second external threads is provided with a biting surface having a concave-convex form. 1. A self-tapping screw comprising:a head; anda shank extending from the head,the shank including a cylindrical shank immediately below the head and a truncated conical shank following an end of the cylindrical shank,the cylindrical shank being provided with a plurality of first external threads,the truncated conical shank being provided with a plurality of second external threads following the first external threads,a peak of each of the second external threads being provided with a biting surface having a concave-convex form, whereinthe biting surface bites into an inner peripheral surface of a pilot hole.2. The self-tapping screw according to claim 1 , whereina plurality of first external threads formed on an end portion of the cylindrical shank are provided with a plurality of no-thread parts at regular intervals in a circumferential direction, anda plurality of second external threads formed on the truncated conical shank are provided with a plurality of no-thread parts at regular intervals in a circumferential direction.3. A method of manufacturing the self-tapping screw claimed in claim 1 , the method comprising the steps of:A) forming a blank with a shank including a cylindrical shank and a truncated conical shank,B) forming, on each of opposing rolling surfaces of a pair of rolling die plates, a vertical surface and an inclined surface that follows a lower end of the vertical surface and is inclined so as ...

Fastener assembly and method

A fastener with a body with a shank, a head adjacent one end of and integral with the shank, and a shoulder adjacent the head, and a separate washer with a through hole received on the shank, bearing on the shoulder and securely fastened to the shank. The body and washer may have an interference fit. The body may be made and the washer attached by cold forming the body with a ring bearing on the washer.

METHOD AND APPARATUS FOR COLD FORMING THREAD ROLLING DIES

A method is disclosed for roll forming the face pattern onto a pattern forming die having a pattern receiving face, using an initial, and subsequent, pattern forming tool, each with a generally cylindrical pattern defining surface, by relatively and sequentially reciprocating and rotating the pattern defining surfaces and the pattern receiving face while engaging them and urging them to impress the pattern of the pattern defining surfaces into the pattern receiving face of the forming die blank. An apparatus for performing the process is disclosed which includes a platen for the pattern forming die, initial and subsequent pattern forming tools each having a generally cylindrical pattern defining surface, a drive mechanism for relatively and sequentially reciprocating and rotating the pattern defining surfaces and the pattern receiving face of the forming die blank, and relative movement mechanism for engaging the surfaces to impress the pattern of the pattern defining surfaces of the pattern forming tools into the pattern receiving face of the forming die blank. 1. A method of roll forming the face pattern onto a pattern forming die comprising:providing a forming die blank having a pattern receiving face;providing an initial pattern forming tool having a generally cylindrical pattern defining surface;relatively reciprocating and rotating said pattern defining surface of said initial pattern forming tool and said pattern receiving face of said forming die blank;engaging said generally cylindrical pattern defining surface of said initial pattern forming tool with said pattern receiving face of said pattern forming die; andurging said generally cylindrical pattern defining surface of said initial pattern forming tool into said pattern receiving face of said forming die blank to impress the pattern of said generally cylindrical pattern defining surface of said initial pattern forming tool into said pattern receiving face of said forming die blank.2. The method of roll ...

Precision Torque Control Positive Lock Nut

A torque control fastener system having a fastener nut, a helical wire insert, and a shaft, where the nut and helical wire insert have unique hardness and coefficient of thermal expansion relationships that produce improved performance. 1. A torque control fastener system , comprising:a fastener nut having a nut proximal end and a nut distal end, a nut bore extending from the nut proximal end into the fastener nut and defining a nut bore axis, a plurality of nut bore threads on at least a portion of the nut bore, and formed of a nut material having a nut Rockwell C hardness of no greater than 42 RWC and a nut coefficient of thermal expansion;a helical wire insert formed to create a plurality of insert coils forming insert external threads and a plurality of insert internal threads, and formed of an insert material having an insert Rockwell C hardness of at least 43 RWC and an insert coefficient of thermal expansion greater than the nut coefficient of thermal expansion, wherein a portion of the insert external threads mate with a portion of the nut bore threads in a portion of the nut bore and engage the fastener nut;a shaft having a plurality of shaft threads that mate with a portion of the insert internal threads such that an insertion torque is required to create relative movement between the shaft threads and the insert internal threads in a first direction, and a removal torque is required to create relative movement between the shaft threads and the insert internal threads in a second direction opposite the first direction;wherein a hardness differential between the insert Rockwell C hardness and the nut Rockwell C hardness is 2-13.2. The torque control fastener system of claim 1 , wherein the insert coefficient of thermal expansion is at least 1.5×10/° C. greater than the nut coefficient of thermal expansion claim 1 , the nut Rockwell C hardness is no greater than 40 RWC claim 1 , and the hardness differential is no greater than 10.3. The torque control ...

BALL SCREW NUT

A ball screw nut having a tubular sheet metal body with a thread profile and being optionally encapsulated in plastic. This sheet metal body is formed of a sheet metal part that includes the thread profile and a ball-returning piece inserted therein, which is designed as an additional sheet metal part. 1. A ball screw nut for a ball screw drive comprising a tubular sheet-metal part that has a thread profile that forms a load section , and a ball return piece forming a deflection section , the ball return piece is constructed as a sheet-metal part that is inserted and fixed in a recess of the tubular sheet-metal part and is open toward a spindle of the ball screw drive.2. The ball screw nut according to claim 1 , wherein the thread profile has a single winding.3. The ball screw nut according to claim 2 , wherein the ball return piece is inserted into a rectangular recess of the tubular sheet-metal part having the thread profile.4. The ball screw nut according to claim 1 , wherein the tubular sheet-metal part having the thread profile is constructed as a seamless tube.5. The ball screw nut according to claim 1 , further comprising a support structure made from plastic that surrounds the tubular sheet-metal part having the thread profile.6. A method for producing a ball screw nut for a ball screw drive claim 1 , comprising the following steps:providing a tubular sheet-metal part having a thread profile,generating a recess in the tubular sheet-metal part by internal stamping,inserting a ball return piece made from sheet metal into the recess such that the ball return piece is open toward a spindle of the ball screw drive.7. The method according to claim 6 , wherein the ball return piece is fixed in the tubular sheet-metal part having the thread profile by welding.8. The method according to claim 6 , wherein the ball return piece is fixed in the tubular sheet-metal part having the thread profile by clinching.9. The method according to claim 6 , further comprising ...

Screw Thread Roller Burnishing Apparatus

Internal and external screw thread burnishing assemblies are provided. In the internal screw thread burnishing assembly, diametrically opposed removable cartridges carrying burnishing wheels are received in cavities of a support structure axially movable into the space circumscribed by the internal screw thread. Fluid pressure is utilized to forcibly translate the cartridges radially outwardly to place their burnishing wheels into burnishing engagement with the internal screw thread, with a spring structure resiliently biasing the cartridges toward retracted orientations thereof within the support structure. In the external screw thread burnishing assembly, burnishing wheels are carried on the outer ends of pivotally supported arms which may be pivoted by fluid pressure to drive the burnishing wheels into burnishing engagement with diametrically opposite portions of the external screw thread, with a spring structure resiliently biasing the arms pivotally away from one another. 1. An apparatus for burnishing an external screw thread , comprising:a support structure;first and second members connected to said support structure at spaced apart locations thereon and being movable relative to said support structure toward and away from one another;a pressure vessel operative to receive a pressurized fluid from a source thereof, said pressure vessel being anchored to said first member and having an extendable piston;first and second thread burnishing structures respectively carried by said first and second members for movement therewith relative to said support structure; anda linking structure coupled between said extendable piston of said pressure vessel and said second member and being threadingly adjustable to (1) retract said extendable piston of said pressure vessel and move said first and second members toward one another to bring said first and second thread burnishing structures respectively into fluid pressure-driven resilient burnishing contact with ...

PRECISION HOLDING AND LOCATING PIN

A readily removable expanding precision holding and locating pin for securing parts to a work surface or assembly. This device works equally well as a threaded in insert with controlled fit counter bore, press fit or controlled fit bore, a taper fit etc. allowing the device to be used in many standard fixtures without modification the fixture, for example, tombstone fixtures mounted on horizontal machining centers. The device itself can be furnished as an oversize mandrel that can be machined to less than 50% of its original diameter. The device holds and can position in the X, Y, Z, directions and also resists rotation along the C/L Axis. 1. An expansion pin , comprising:a cylindrical body having a sidewall and an interior cavity extending from a top end towards a bottom end of the cylindrical body, aa plurality of slots defined in a top end of the cylindrical body and radially emanating from the interior cavity through the sidewall, the plurality of slots defining a plurality of gripping fingers around a circumference of the sidewall,a tapered surface portion converging inwardly along an interior face of the plurality of gripping fingers; anda bolt having a frusto-conical head that converges inwardly from a top end of the bolt and terminates at a shank of the bolt, the shank having a plurality of external threads, wherein the frusto-conical head urges the plurality of griping fingers radially outwardly when the bolt is threadingly tightened to draw the frusto-conical head within the tapered surface portion of the cylindrical body.2. The expansion pin of claim 1 , further comprising:an annular expansion groove defined around the cylindrical body at a terminus of the plurality of slots.3. The expansion pin of claim 1 , further comprising:a plurality of external mounting threads extending from the bottom end of the cylindrical body.4. The expansion pin of claim 1 , further comprising:a plurality of internal threads defined in the interior cavity below the tapered ...

SPLINE ROLLING RACK AND METHOD

A spline rolling rack assembly for cold-forming external surface configurations upon a metal workpiece is provided, having a durable carriage of the type secured upon a reciprocating slide assembly, a perishable rack insert that is removably secured upon the carriage, a locating key disposed between the rack insert and the carriage for properly aligning the rack insert upon the carriage, a locating assembly disposed upon the carriage and engageable with the rack insert for assisting in properly aligning the rack insert and the carriage between load and work positions, and multiple clamping assemblies disposed within said carriage for releasably securing the rack insert upon the carriage. The perishable rack insert is designed for quick and convenient replacement, reducing maintenance cost and idle time for these devices. The single-use nature of the insert relieves the user from the burden of managing an inventory of like tools, in various states of use, in order to ensure that new tools are ordered in a timely manner for replacing tools that have exhausted their useful life. 1. A spline rolling rack assembly for cold-forming external surface configurations upon a metal workpiece , comprising:a durable carriage operable for being fixedly secured upon a reciprocating slide assembly within a machine for forming external surface configurations upon said metal workpiece, said carriage having a mounting surface, said carriage operable for sliding in relation together with rotation of the workpiece;a perishable rack insert operable for being removably secured upon said mounting surface of said carriage, said rack insert having a working surface with a series of feature-forming surfaces formed thereupon for forming external surface configurations upon a metal workpiece and a locking bearing surface, said rack insert operable for being removed from, and secured upon, said carriage within said machine without removing said carriage from within said machine;a locating key ...

Cold Rolling Devices and Colled Rolled Rotary Shouldered Connection Threads

A method of cold rolling a thread on a tubular support member of a rotary shouldered thread connection includes obtaining an original root depth of a thread root, cold rolling the thread until a minimum increased root depth tolerance is achieved. The thread may be cold rolled with a wheel tip having an elliptical profile. 1. A thread cold rolling device , comprising: an equivalent root radius of about 0.057 inches to about 0.061 inches;', 'a first and a second wheel angle between the center axis and opposing sides of an outer surface of the wheel tip, wherein the first wheel angle is about 20 degrees to about 30 degrees; and', 'a root depth of about 0.012 inches to about 0.020 inches., 'a wheel having a center axis perpendicular to a wheel rotational axis and a wheel tip having an elliptical root profile comprising2. The device of claim 1 , wherein the elliptical root profile of the wheel tip further comprises:a major axis having a semi-major axis length of about 0.050 inches to about 0.055 inches; anda minor axis having a semi-minor axis length of about 0.013 to about 0.020 inches.3. The device of claim 1 , wherein the outer surface of the wheel has a roughness of about 8 to about 32 micro-inches.4. The device of claim 1 , wherein the outer surface of the wheel has a roughness of about 16 micro-inches.5. The device of claim 1 , wherein the first wheel angle and the second wheel angle may be the same or may be different.6. The device of claim 1 , wherein the second wheel angle is about 15 to about 20 degrees.7. The device of claim 1 , wherein the first wheel angle is about 25 to about 29 degrees and the second wheel angle is about 17 to about 20 degrees.8. The device of claim 1 , wherein:the equivalent root radius is about 0.058 inches;the root depth is about 0.014 inches;the first wheel angle is about 28 degrees;a major axis of the elliptical root profile of the wheel tip has a semi-major axis length about 0.052 inches; anda minor axis of the elliptical root ...

AUTOMATIC STEEL-BAR COUPLING HEAD MAKING MACHINE

The present invention is to provide an automatic steel bar coupling head making machine including a positioning mechanism, a transverse moving mechanism, a longitudinal moving mechanism, a processing mechanism assembly and a control mechanism, wherein, when a steel bar is positioned between two fixtures of the positioning mechanism and an end of the steel bar presses against a positioning detection rod of the processing mechanism assembly, the processing mechanism assembly sends a start signal to the control mechanism and, upon receipt of the start signal, the control mechanism drives the positioning mechanism, the transverse moving mechanism, the longitudinal moving mechanism and the processing mechanism assembly, for enabling the two fixtures to clamp the steel bar and then enabling the processing mechanism assembly to sequentially perform a first turning, a second turning and a thread rolling on peripheral edge of the steel bar adjacent to the end of the steel bar. 1. An automatic steel-bar coupling head making machine , comprising:a fixing base having a bottom side fastened on a plane;a positioning mechanism fastened at a position on an upper surface of the fixing base and adjacent to a front side edge of the fixing base and comprising two fixtures, wherein each of the two fixtures has a fastening groove recessed on a side surface thereof, the fastening grooves of the two fixtures correspond to each other and form a channel therebetween, under a condition that the two fixtures are not pressed against with each other, so as to enable a steel bar to be passed through the channel, and wherein, under a condition that the two fixtures are pressed against with each other, the fastening grooves are pressed against two opposite outer edges of the steel bar, so as to fixedly clamp the steel bar between the two fixtures;a guiding seat having a bottom side fastened at a position on the upper surface of the fixing base and adjacent to a rear side edge of the fixing base;a ...

HEAT TRANSFER SURFACE

A method for forming features in an exterior surface of a heat transfer tube includes forming a plurality of channels into the surface, where the channels are substantially parallel to one another and extend at a first angle to a longitudinal axis to the tube. A plurality of cuts are then made into the surface substantially parallel to one another and extend at a second angle to a longitudinal axis to the tube different from the first angle. Individual fin segments extend from the surface and are separated from one another by the channels and the cuts. The fin segments have a first channel-adjacent edge adjacent substantially parallel to the channel, a first cut-adjacent edge substantially parallel to the cut, and a corner formed by a second channel-adjacent edge and a second cut-adjacent edge. A tube formed using this method can be used as a condenser tube. 1. A method for forming features in an exterior surface of a heat transfer tube , the method comprising the steps of:forming a plurality of channels into the surface, the channels being substantially parallel to one another and extending at a first angle to a longitudinal axis to the tube; andcutting a plurality of cuts into the surface, the cuts being substantially parallel to one another and extending at a second angle to a longitudinal axis to the tube, the second angle being different from the first angle, the cutting step forming individual fin segments extending from the surface, the fin segments being separated from one another by the channels and the cuts;wherein the fin segments comprise a first channel-adjacent edge substantially parallel to the channel, a first cut-adjacent edge substantially parallel to the cut, and a corner formed by a second channel-adjacent edge and a second cut-adjacent edge, the corner rising upward from a channel floor and partially extending into the channel.2. The method of claim 1 , further comprising a step of compressing the fin segments with a roller claim 1 , causing an ...

Method For Producing A Connecting Element, Connecting Element, And Rolling Tool

The invention relates to a method for producing a connecting element comprising at least two ball-like sections, wherein two ball-like sections are directly adjacent to each other, or wherein two ball-like sections are connected to each other by means of a connecting section, wherein the rolling of a single-piece blank, which is cylindrical at least in sections, between at least two rolling tools and the shaping of the at least two ball-like sections and optionally of the connecting section during the rolling are provided. 1. A method for producing a connecting element comprising at least two ball-like sections , wherein two ball-like sections are directly adjacent to each other , or wherein two ball-like sections are connected to each other by means of a connecting section , the method including rolling a single-piece blank , which is cylindrical at least in sections , between at least two rolling tools and shaping the at least two ball-like sections and optionally the connecting section during the rolling.2. The method as claimed in claim 1 , wherein the shaping takes place over the course of 10 to 15 revolutions of the blank.3. The method as claimed in claim 1 , further including cutting off a respective slug from the outer ends of the ball-like sections at the end of the rolling operation by means of a separating edge on a rolling tool claim 1 , which separating edge extends beyond the center longitudinal axis of the connecting element.4. The method as claimed in claim 1 , further including holding the blank at least before the beginning of the rolling at a supply head of the blank that is disk-like and projects in the radial direction over the blank which is cylindrical except for the supply head.5. The method as claimed in claim 3 , further including cutting off the supply head together with cutting off one of the slugs.6. The method as claimed in claim 1 , wherein the blank has a circular-cylindrical basic body.7. The method as claimed in claim 1 , wherein ...

Forming of inner grooves in thin tubes - involves mandrel and pressing rollers to control flow forming

Blanks of high-strength steels, such as maraging steel, are used and one end of the blank has a threaded section inserted into a ring. The mandrel which is contoured in correspondence with the grooves in the tube is pushed into the bore of the blank which is coaxial with its outside surface. A steadying ring fits round the outside surface while press rollers engage the chamfered end of the blank. The mandrel is held in the machine arbour and helical grooves may be formed and the wall thickness of the blank may be subject to a reduction of over 50%. The process eliminates costly machining and also improves the fibre structure.

Verfahren und Vorrichtung zur Herstellung von für Wärmeaustauscher bzw. Kondensatoren usw. bestimmten Metallrippenrohren

Methods for manufacturing endodontic instruments from powdered metals

Endodontic instruments or intermediate products (e.g., blanks) used to form finished endodontic instruments having a desired cutting edge and/or taper are formed, at least in part, by molding a metal powder into a desired shape and then sintering the metal particles together. The metal powder is initially formed into a green molded part that is sintered to yield a solid metal part. The sintered metal part may optionally be further processed by additional steps, as needed, to yield a finished endodontic instrument. One additional process includes cold forming the sintered metal body to provide a cutting edge, remove cracks and microfissures, or otherwise modify the characteristics of an intermediate product or endodontic instrument. Other processes include chemical milling and mechanical milling, grinding or cutting to sharpen the cutting edge, form a taper, or otherwise modify the intermediate product or endodontic instrument in a desired manner.

Manufacturing method of a drill

A method of manufacturing a drill comprises providing an elongate element defining a longitudinal direction and having, in the longitudinal direction, a front end, an intermediate section, and a rear end opposite to the front end; forming by cold forming only, at the front end, a drill tip having a cutting edge; and, forming by cold forming only, on the intermediate section, a channel extending along the longitudinal direction.

Method and device for rolling threads with rolling rolls

A method for rolling threads on workpieces (26) by means of opposing and co-rotationally driven rolling rolls (3, 13) in a forming process, comprising a rolling gap (43), which forms between the rolling rolls (3, 13) and in which the workpiece (26) that is intended to undergo the forming operation is provided on its outer circumference with a thread or a thread-like profile by undergoing forming by a rolling thread (17, 27) on the rolls, wherein, in a first method step, at least one rolling roll (3) performs a linear movement in order to open the rolling gap (43), and wherein, in a second method step, the rolled stock (26) that is intended to undergo the forming operation is transported into this opened rolling gap (43), wherein, in a third method step, the rolling gap (43) narrows, and so the rolling thread (17, 27) of the mutually opposing rolling rolls (3, 13) lies against the outer circumference of the rolled stock (26) with a forming effect, and wherein, in the next method step, the rolling gap (43) is opened again and the rolled stock (26) on which rolling has been completed is transported out of the rolling gap (43). The invention also relates to a device for rolling threads.

Tangential thread rolling-on head

Re-rolling apparatus having improved dies and diesblock

The present invention relates to a re-rolling apparatus comprising: a rotating roller; and a dice part arranged separately from the rotating roller in a previously established interval, having a dice and a dice block to support a material such that the material is re-rolled by being inserted between the rotating roller and the re-rolling apparatus. A curvature radius of an outer side of the dice is formed to be smaller than a radius curvature of an inner side of the dice block supporting the dice. In order to maintain an interval between the dice and the dice block elastically, the dice is installed such that the dice is able to elastically be flexible up and down on the inner side of the dice block. According to the re-rolling apparatus comprising the improved dice and the dice block of the present invention, since the dice is re-rolled by being elastically supported to the dice block, burr generated in a first-rolled material or precipitate of a rust-prevention and corrosion-resistant painting stained on a surface is able to automatically be removed. At the same time, it is able to be prevented such that a coating layer of the re-rolled material is damaged by the burr or the surface of the coating layer stabbed. Moreover, since cleansing after material processing or a post-process of burr removal by a prior rolling process is able to simply be performed by the re-rolling apparatus of the present invention, the present invention has the effect of reducing post-process work time and improve a quality of a product.

用于加工滚珠丝杠的螺母的方法

一种用于加工滚珠丝杠的螺母的方法，具有：第一步骤，车削或切削滚珠丝杠的螺母的螺旋形滚动表面，滚珠丝杠的滚珠可以在该螺旋形滚动表面上滚动；第二步骤，热处理、例如渗碳和淬火或高频淬火处理在第一步骤中获得的螺旋形滚动表面，由此硬化滚动表面的顶面；以及第三步骤，基于电解抛光工艺表面精加工在第二步骤中获得的螺旋形滚动表面中经硬化的表面层。

クランクシヤフトネジギアの転造装置

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Головка дл накатывани резьбы на метчиках

Tangential thread rolling head

Machine for knurling thread

Method of mafufacturing nut spindle of electric parking break system

The objective of the present invention is to provide a method to manufacture a nut spindle of an electronic parking brake system, manufacturing a nut spindle through a forging technique, so as to remove an effect that grain of a metal is cut in an existing machine process for making a nut spindle by cutting a raw material, and thereby the nut spindle is not easily damaged or ruptured even if twisting is applied. Thus, quality as well as safety can be enhanced. More specifically, since both end edges of a raw material cut into a predetermined length is chamfered by one forging process, the number of manufacturing processes is reduced and thereby productivity is increased. According to the present invention, the method comprises: a raw material cutting step; a chamfering step; a nut forming part processing step; a head forming step; a channel forming step; a sub channel forming step; and a nut tapping step.

Thread roller for thread rolling head - has cylindrical shoulder with marking for engraving

The roller is for a radial thread rolling head, and has a flattened section. The roller (10) has a cylindrical shoulder (14) on its end face (13), with a cylindrical ring shoulder (16). The ring shoulder has a radially projecting marking (20) to form an engraving in a workpiece (50). The marking is worked into the outer edge of a plate (18), which is removably held in a chamber (25) of the shoulder. USE - Roller for radial thread rolling head.

Grooving device of pipe

본 발명은 홈파인 척(6)을 장착한 플로우팅 척(5)를 관(2) 내부의 적소에 유지시키는 홀딩 다이(4)를 구비한 장치(1)에 관한 것으로, 홈파기 장치(7)은 홈파인 관(2R) 및 마무리 다이(10)을 형성하도록 볼(9)를 둘러싼 회전 케이지(8)을 구비하고, a) 상기 케이지(8)은 축방향 단면으로 내측 프로화일(26)의 원(13)의 아크를 구비하는 지지부재(11) 및 상기 케이지용 폐쇄 평판(12), b) 윤활수단으로 구성되는 것을 특징으로 한다. The present invention relates to a device (1) having a holding die (4) for holding a floating chuck (5) with a grooved chuck (6) in place in a tube (2). ) Has a rotating cage (8) surrounding the ball (9) to form a grooved tube (2R) and a finishing die (10), the a) said cage (8) having an axial cross section of the inner profile (26); And a support member 11 having an arc of the circle 13 and the closing plate 12 for the cage, b) lubrication means.

Tangential thread rolling head

Tangential thread-rolling head

Device for continuous corrugating of pipes

I. УСТРОЙСТВО ДЛЯ НЕПРЕРЫВНОГО ГОФРдаоВАНВД ТРУБ из пластически деформируемого материала, преимущественно кабельных оболочек из металла , содержащее установленную с возможностью принудительного вращени  гофрообразующую головку, на корпусе которой смонтированы с возможностью свободного вращени  и со взаимопротивоположным эксцентриситетом втулки с формутащими ребрами на внутренней поверхности, диаметр в свету которых больше диаметра трубы-заготовки, отличающеес  тем, что, с целью улучшени  качества труб за счет получени  равномерных гофров, гофрообразующа  головка снабжена механизмом синхронизации вращени  втулок одна относительно другой, оси втулок размещены параллельно оси подачи трубы-заготовки, при этом формующие ребра обеих втулок параллельны друг другу, а отнощени е диаметра в свету отверсти  втулок к диаметру гофрированной трубы, в зоне впадины гофра составл ет целое четное число, не менее 2, с максимальным отклонением 5%. 2.Устройство по п. 1, от л ичающеес  тем, что формующее ребро имеет вид винтовой линии. 3.Устройство по пп. 1 и 2, отличающеес  тем, что формующее ребро состоит из трех витков и имеет входной участок, на котором его высота увеличиваетс  от начала ребра до величины, соответствующей высоте гофров. 4.Устройство по пп. 1 - 3, отличающеес  тем, что входной участок формующего ребра расположен по меньшей мере на двух витках ребра. 5.Устройство по пп. 1 - 4, отличающеес  тем, что на каждой втулке выполнены дополнительные СП формующие ребра. 6.Устройство по пп. 1 и 5, о т личающеес  тем, что по меньшей мере три формующих ребра выполнены кольцеобразными. 7.Устройство по пп. 1 и 6, о тлич . ающеес  тем, .что формующие ребра Ш{еют входной участок, на со котором их высота увеличиваетс  до 00 5епи-:шы, соответствующей высоте гофров. 8.Устройство по пп. 1, 6 и 7, Ы отличающеес  тем, что входной участок формующих ребер расположен по меньшей мере на двух формующих ребрах. 9.Устройство по пп. 1 и 8, отличающеес  тем, что механизм синхронизации относительного ...

CARVER THREAD * AH FASTENING PART

Tangential thread-rolling head

ТАНГЕНЦИАЛЬНАЯ РЕЗЬБОНАКАТНАЯ ГОЛОВКА, содержаща  корпус , резьбонакатные ролики, жестко закрепленные на ос х, установленных в корпусе с возможностью вращени , и механизм взаимной ориентации роликов, выполненный в виде дисков и т ги, эксцентрично закрепленной на дисках посредство.м шарниров , оси которых расположены в плоскости. параллельной ос м вращени  роликов, отличающа с  тем, что, с целью расширени  технологических возможностей путем обработки нежестких деталей и повышени  качества обработки за счет жесткой св зи между резьбонакатными роликами, она снабжена дополнительной осью, жестко закрепленной в корпусе, установленном на этой оси с возможностью вращени , дополнительным диском с эксцентрично размещенным на нем шарниром, св занным посредством т ги с шарнирами основных дисков, при этом оси всех шарниров расположены с угловым смещением относительно осей дисков на величину, равную половине числа заходов резьбы резьбонакатных роликов . (О CZ СХ) / со ю а ю TANGENTIAL THREADED HEAD, comprising a housing, thread rolling rollers rigidly mounted on axles mounted in the housing rotatably, and a mechanism of relative orientation of the rollers made in the form of discs and a pull eccentrically fixed on the disks by means of m. Hinges, whose axes are located in plane. parallel to the axis of rotation of the rollers, characterized in that, in order to expand technological capabilities by processing non-rigid parts and improving the quality of processing due to the rigid connection between the thread rolling rollers, it is equipped with an additional axis rigidly fixed in the housing mounted on this axis rotation, an additional disk with an eccentric hinge placed on it, connected by means of a hinge to the hinges of the main disks, while the axes of all the hinges are arranged with angular displacement relate no drive axes by an amount equal to half the number of thread starts thread rolling rollers. (O CZ СХ) / сю аю ю

Thread rolling die for self-tapping screw

The self tapping screw has a drill head at its leading end. The spiral cutting blades (32,32') enclose the tapered shaft end which converges from the core diameter of the screw shaft (24) to a point at its end. The hole diameter (1) produced by the drill head is slightly larger than the core diameter (m) of the screw shaft (24). To increase the cutting blade strength, their trailing edges (30) are provided with bigger helix angle than the cuting edges (26).