MECHANISM FOR MANUFACTURING FROM DURCHZUEGEN OUT OF SHEET METAL EXISTING WORKPIECES ON A CUTTING PRESS.
The invention refers to a mechanism for manufacturing from Durchzügen out of sheet metal existing workpieces on a cutting press with numerically steered coordinate table with a stencil in a vertically mobile upper tool and an associated stamp basic Unterwerkzeug.
During the processing of workpieces consisting of sheet metal, it is frequently necessary to make so-called Durchzüge. As Durchzüge in particular designates here thread by courses, louvers (Kiemen), hollow coinages or Tiefzieharbeiten. Such work in the entire sheet metal processing, if no special demands exist and as far as it concerns single operations, under normal eccentric presses are implemented, in such a manner that see the stencil on the press table as secondary tool finds and the stamp is installed in the upper tool under the tappet. This means that lo the passage, i.e. the respective recess, is formed downward in the Werkstüek. However if a such cutting press with one is numeric or NC controlled coordinate table combined, this function is not applicable, since the straight produced Durchzüge was then destroyed with proceeding the workpiece into the next position. In order to avoid such a destruction, one was forced to turn around the function i.e. the stamp is now in the secondary tool and the stencil in the OberwerkÆng. From a such, initially indicated mechanism the invention goes to. The workpiece remains according to experience with a such operation at the stamp, which can be regarded also as Ziehdorn, hangs and must by a special stripper are pushed away. With the well-known mechanisms now the stamp is in the secondary tool rigidly inserted, so that at least its point, in order to ensure a safe stripping, at least around the Dnrchziehtiefe over the surrounding Werkzeugnivean, thus the bearing surface for the workpiece, exceed. Such a construction is however afflicted with crucial disadvantages. On the one hand the Freiranm between stencil and stripper, how it is usually present, by it restricted with the consequence that also the Durehziehtiefe is finally beschrãnkt. On the other hand the tool level remains in a cutting press, thus the level with the frequently used tool shop, given by the Aufageflächen, no longer evenly, but and/or several increases develop, over which the workpiece must be shifted. This has further as a consequence that on use of a Werkzeugrnagazins, e.g. the tools of basic gun plate, the tool close stations, which are arranged beside a pulling through station with the rigid stamp are not no more used for normal cutting können.
The invention is the basis the task to create a Ein6chtung of the initially indicated kind with which all Aufageflächen for the workpiece including any strippers for special tools (e.g. for Gewindetütwerkzeuge) lies in one level, in particular also when using tool shops such as gun plates or such a thing and the stamp during the shift movement of the workpiece within the bearing surface of the secondary tool and thus within the tool level is, so that the described unfavorable effects of managing tool tools and in particular ss the managing stamp are avoided. The workpiece soli without each handicap or damage by the stamp of the secondary tool to be thus shifted can, so that the provided Durchzüge beeinfusst in no way unfavorably and would drive through further the further stations unhindered normal cutting planned in a tool shop können.
This is reached after the invention by the fact that the stamp is mobile led in the secondary tool from in or below the Werkstückaufagefläche of the secondary tool convenient resting position in its from these Werkstückaufagefäche out-standing working position with the help of a drive and the stencil with the upper tool up to the edition on the workpiece surface lowerable ist.
It thus created during a mechanism of the initially indicated kind a secondary tool, with which the stamp implements a vertical working movement from bottom to top and in particular to completion of its working stroke to those or under the workpiece bearing surface returns, thus thereafter no obstacle more for the shift of the Werkstüeks forms. Due to the back drawing movement of the mobile stamp by the stamp a stripping movement one implements at the same time. When using tool shops like in particular gun plates so all bearing surfaces for the workpiece including of them can be arranged if necessary necessary strippers in a common level. The workpiece can be shifted completely unhindered by the coordinate table steered. The stencil implements only a sinking movement, with which it presents itself on the workpiece surface, over in the usual way then as counter bearing for the stamp movement of the secondary tool too dienen.
After one both of the building method as well as of the function the stamp is carried favourable arrangement of the invention to an operating pin, that in back getting direction feather-subjected and attack-limited is and on the propelling stroke mechanism arranged against a lower drive surface in Arbeitsñchtung underneath the secondary tool at the press lower part einwirkt.
The secondary tool can thus include-borrowed the stamp and the operating pin in the ûblichen tool tools arranged and led to be, and it works the propelling stroke mechanism below the Werkzeugtrãgers against the lower Antriebsfläehe. The secondary tool with the stamp and the operating pin including its return spring kõnnen in usual way in the tool carrier, in particular in a tool shop as a gun divisor, beside further tools, in particular normal cutting tools, arranged its. It can do thus at the cutting press first, always steered from the coordinate table which preliminary work are implemented with the help of the cutting tools in the places wished in each case, according to which then with the help of the mechanism after the invention at the before provided break-throughs the Durchzüge wished in each case manufactured werden.
After a further execution form of the invention the operating pin for the stamp is stored in the lower Werkzeugtrãger and exhibits in the secondary tool be* weglichen, in the rest position therein supporting ring attack as well as above the lower drive surface a further ring attack and supports themselves furthermore a back getting compression spring between the lower surface of the secondary tool and the further ring attack within the lower tool carrier off. Thereby a compact construction unit is produced, easily into the respective lower tool carrier inserts themselves Iässt.
If it concerns at the longing oath press exhibiting the mechanism such, with which underneath the secondary tool in the press underframe a waste chute is intended, i.e. for the normal cutting tools applicable on this cutting press beside the mechanism after the invention, which with cutting presses with tool shop and in particular with gun cutting presses the case is, then it is appropriate, if for adjustment to these conditions in further arrangement of the invention the driving component of the stroke mechanism from a resting position lain underneath the waste chute is the waste chute penetrating in the operating pin of the stamp propelling working position movable and the waste chute in the motion travel of the driving component exhibits a free arm cover swing-out from this motion travel, their lagging in Abh i: igkeit of the 655,024 movement of the driving component controllable is. With such cutting presses the Hubeindchtung is thus directly under the Durchfalloch for the Schneidabçålle with the waste chute, and it must take place the installation of the stroke mechanism so deeply that the discharge of the gumption wastes can be made during assigned stroke mechanism by the waste chute problem-free. This reached by the managing arrangement of the invention, since only in the case of a drive movement of the driving component of the stroke mechanism o the free arm cover of the waste chute is operated, in order to leave the driving component freely driven through, during with not operated free arm cover the waste chute their normal function fulfill kann.
As a result of the described deep installation of the Hubeinrichi5 tung a relatively large distance between the drive surface of the driving component of the stroke mechanism in their resting position and the lower drive surface of the operating pin for the stamp arises. In order to carry with the enterprise of the stroke mechanism calculation, the Hubeinriehtung is in such a manner trained as the execution of different drive speeds that their driving component up to the plant implements a rapid feed to the lower Antñebsfläche of the operating pin of the stamp and in continuation of the drive movement a working stroke with low speed and high Kraft, the latter then for the actual working movement of the stamp of the mechanism according to invention after a further execution form of the invention. It will thus drive through the described larger distance between the mutual drive surfaces with high speed and only with the driving pressure necessary for while after plant of the mutual drive surfaces the actual working stroke with low speed is only implemented and high Kraft. Such a according to invention used stroke mechanism can consist of a Pneumatikoder a hydraulic cylinder or of a cylinder unit, with which by compressed air oil is produced and with that compressed air a rapid feed produced and in with the help of the produced Drueköls the working stroke with low speed and high Kraft the rapid feed follows. Also a cylinder unit can be used, with which by compressed air a rapid feed is produced, which due to mechanical translation members a working stroke with high Kraft and low speed follows. In addition, it is possible, the stroke mechanism from purely mechanical elements like e.g. spindles, elbow levers, bell cranks or a combination of such elements too erstellen.
Appropriately carried thereby the stroke mechanism in the tool longitudinal axis of one in the press lower part angeordrieten cross beam underneath the waste chute. Thereby the remaining structure of machine and in particular the structure by tool shops such as gun plates or such, in no way handicapped to separate can in usual way be trained, during all according to invention elements and devices necessary for the drive of the mechanism in the press lower part in the tool longitudinal axis arranged sind.
Further details and advantages of the invention result from the dependent requirements and the following description of a remark example of the invention on the basis the design. In the design the invention described on the basis a mechanism for manufacturing thread by courses at a workpiece consisting of sheet metal. Only those parts of the mechanism and the cutting press are represented as far as possible schematically in the design, which can serve the invention for the Erlãuterung. In the design show:
655,024 Fig. 1 a Lãngsschnitt by the tool range of the mechanism after the invention at a cutting press, Fig. 2 in the profile one partialregards from Fig. 1 in working position of the mechanism, Fig. 3 in the profile a Fig. 2 appropriate scrap view from Fig. l in the resting position of the mechanism after production of the thread passage, Fig. 4 a Lãngssehnitt by the drive component of the Einñchtung with the Hubeinñchtung.
Fig. 1 shows schematically the tool section of the Einñchtung after the invention. In a schematically shown upper tool carrier TON is arranged the upper WerkzeugteiI 17 and in this tool tools TON vertically mobile. The tool part of 17 is designed in the lower range as stencil with the drilling 18. To the upper tool 17, 18 is coaxial at a lower tool carrier DOES, in particular to a tool shop like a gun plate of a gun cutting press, above a drilling 23 in the lower tool tools DOES the secondary tool 7 arranged. In a drilling 7a of the secondary tool 7 vertically mobile here as pulling through cathedral a stamp trained with its point 20 is 15 led across a ring attack 6a of an operating pin 6 for the stamp with the ring attack 6a supports sích the stamp 15 in Fig. 1 represented rest position within the drilling 7a of the secondary tool 7 off. Furthermore the stamp 15 is mobile in a Bobrung 7c in the top of the secondary tool 7 geführt.
The Betätigungsbolze 6 through-hires the drilling 23 of the lower tool carrier DOES and exhibits within the lower range a ring attack 6b, which a section follows downward, which forms a lower Antfiebsfläche 5 at its front surface. Between a lower Flãche 7b of the secondary tool 7 and the ring attack 6b of the operating pin 6 a back getting compression spring 19 supports itself off, thus the Betãtigungsbolzen 6 and the stamp 15 in back getting direction feather-subjected. For the drive of the Betãtigungsbolzens 6 and thus the stamp 15 directed upward a stroke mechanism with a driving component 4, still which can be described, is intended, its drive surface 4a itself during drive movement arranged upward against the lower Antñebsfläche 5 of the Betãtigungsbolzens 6 anlegt.
Like Fig. 1 and 3 shows, is the stamp! 5 with its point 20 in its resting position always in or underneath the bearing surface 7d of the secondary tool 7 for the workpiece 13.
The function of this mechanism is the following: ÜbIicherweise are pulled thread by courses from prepunched holes, i.e. in a first processing step the appropriate holes are brought into the workpiece 13, in the remark example the hole 14. In a second processing step with the mechanism after the invention the Gewindedurehzüge is manufactured. The workpiece or sheet metal 13 is positioned in such a way with the help of the coordinate table that the hole 14 above the stamp 15, the pulling through thorn 15 with its point 20, comes to thus lie exactly, which means that the hole 14 is positioned also in appropriate way in relation to the drilling 18 of the stencil I7 of the upper tool. Afterwards a stroke of the not represented eccentric cam drive of the cutting press is released and stopped in the lower dead center, so that the lower surface 16 of the upper tool and/or the stencil 17 on the workpiece surface aufiegt, like Fig. 2 zeigt.
Afterwards the drive movement of the driving component 4 directed upward is released, and it becomes over the two drive surfaces 4a and 5 the operating pin 6 against the effect of the feather/spring 19 angctrieben, so that the stamp 15, thus the pulling through thorn, penetrates 20 into the hole 14 with its point. Thus it comes to an expand and simultaneous raising of the sheet metal material work-cheats 13 in the annulus surface between the diameter of the hole I4 and the drilling 18 of the stencil I7. During the white teren penetration of the pulling through thorn 15 a collar, which rests on the one hand against the inner wall 21 of the drilling 18 and on the other hand the stamp and/or pulling through thorn 15 encloses firmly, forms like Fig. 2 shows. The height of h of the collar 22 results from the quantity of the Matel0 the available rials, i.e. with a small hole 14 a high collar 22, in the case of one larger results accordingly niedriger.
If the stamp or pulling through thorn reached] 5 its highest point, then the driving component 4 in the direction of motion is turned around, and it Fåhrt under the effect of the RfickhoIdruckfeder] 9 the operating pin 6 with the stamp or pulling through thorn 15 into its rest position zurück.
Thus the pulling through thorn 15 also out of the collar 22 is pulled, the Werkstfick 13 by the stamp] 5 is thus stripped. The upper tool and/or the stencil 17 is led back by renewed switching on of the cutting press on into the origin situation and the cutting press in the upper dead center is switched off. The finally reached position of the mechanism after the invention shows Fig. 3. Thus the cycle is final for the production of a thread passage, and by procedures of the workpiece 13 into a new position a further passage can manufactured werden. in another place in the sheet metal
Fig. 4 shows for the Antñeb of the operating pin 6 and thus the stamp 15 planned the device within the mechanism after the invention: A stroke mechanism 1, which is out-arranged in the initially mentioned way with different speeds, is in an appropriate way fastened with the help of a cross beam 2 to the press lower part PU. Since in the remark example with these Schneid3s press yourself the stroke mechanism I under the Durchfalloch for the gumption wastes finds directly, it is in such a manner deeply inserted that the discharge the sports club of envy wastes can be made by a waste chute 3 problem-free. Thus a relatively large distance A between the upper drive surface 4a of the driving component 4 of the stroke mechanism 1 and the lower drive surface 5 of the operating pin 6 of the stamp 15 results. This distance A will from there in the way already described through the driving component 4 of the stroke mechanism 1 in rapid traverse driven up to the plant of the two drive surfaces 4a and/or 5. thereafter effected then the working stroke of the driving component 4 for the movement of the stamp 1 5 in Fig, already described. 2 represented Arbeitsstellung.
So that the driving component 4 can reach the drive surface 5 of the operating pin 6, the waste chute 3 was made permeable frir for s0 the driving component 4. For this purpose the waste chute 3 provided with a Versehlussklappe 8 is, which is tiltable around an axle 9. At the press lower part PU for this purpose an air cylinder 11 is arranged, which propels the lagging over a linkage 10 ss the free arm cover 8. As a function of the drive movement of the driving component 4 of the stroke mechanism 1 the air cylinder 11 with compressed air is subjected and swivelled over the linkage 10 the free arm cover 8 around the axle 9 in such a manner that the way for the driving component 4 be released and this can be driven out completely into the upper drive position suggested with dash-dotted lines, without at the waste chute 3 anzustossen.
By electrical control elements 12 and/or 1 2 " is avoided the free arm cover 8 in their end position controlled like also the upper section of the driving component 4. by the fact that it can come due to false programmings to the damage of the mechanism. With the help of the stroke mechanism described here those is caused far function of the tool part of the mechanism according to invention described above. By the described arrangement of the stroke mechanism 1 in connection with the waste chute and the arrangement in the press lower part PU becomes in particular with cutting presses with tool shop, e.g. a gun cutting press with gun plates, which unchanged use of in such a way arranged press lower part for the normal cutting tools makes possible. Above all, as also the descriptive Ausfüh655 024 shows rungsbeispiel, it is reached by the invention that all bearing surfaces for the Werkstüek can be arranged in one level also when manufacturing Durchzügen, without any tool tools and in particular a stamp for the production of Durchzügen from such a level stood out and thus in the initially described way the shift of the workpiece by the coordinate table obstructs or impairs the manufactured Durchzüge könnte.
to s 3 sheet designs 655,024 3 sheet sheet 1 Fig.1 TON õ 77 16 18 13 7 DO 19 23 6b A drawing arrangement for producing drawn formations in sheet-shaped workpieces includes a lower tool having a supporting surface for the workpieces and a recess which opens onto the supporting surface, and an upper tool having a female die and movable toward and away from the lower tool for confining a region of the workpiece between itself and the supporting surface. A mandrel is mounted in the recess of the lower tool for movement between a retracted position in which it is fully accommodated in the recess and thus does not project beyond the supporting surface and form an obstruction to the movement of the workpiece, and an extended position in which it penetrates into the female die and forms the drawn formation in the workpiece. The punch is mountd on an actuating member which has a lower contact surface, and the movement of the actuating member is achieved by a lifting device which has an operating member movable toward and out of contact with the contact surface, and a spring which urges the actuating member toward its retracted position. During the retraction movement, the punch itself acts as a stripping tool for the workpiece. A descending chute can be interposed between the actuating and operating members and has a pivotable section movable out of the path of movement of the operating member. The operating member may move at different speeds during approach to the actuating member and thereafter. 1. A drawing arrangement, particularly for use in a cutting and pressing machine having a numerically controlled coordinate table, for producing drawn formations on substantially sheet-shaped workpieces having respective bottom surfaces that travel along a predetermined plane during relative movement between the workpieces and the arrangement, comprising a support; a first tool mounted on said support below said predetermined plane and having an upper supporting surface for supporting the workpieces, permanently arranged in the predetermined plane, and a recess which opens onto said supporting surface; a second tool mounted on said support above the predetermined plane for movement in opposite directions toward and away from said first tool upto area contact with the respective workpiece supported on said supporting surface, and including a female drawing die aligned in said opposite directions with said recess of said first tool; and a drawing punch mounted on said first tool within said recess for movement between an extended position in which it extends beyond said supporting surface toward said female drawing die to deform a portion of the workpiece into the latter and a retracted position in which it is fully retracted into said recess of said first tool and is at most flush with said supporting surface of said first tool in order not to interfere with the movement of the workpiece along the predetermined plane. 2. The drawing arrangement as defined in claim 1; further comprising an actuating member carrying said male punch and movable in extending and retracting directions relative to said first tool; abutment means for delimiting the extent of movement of said actuating member in the retracting direction; biasing means including at least one spring for urging said actuating member toward said abutment means; and means for moving said actuating member in opposition to the force of said biasing means in the extending direction, including a lifting device disposed below said first tool and acting on said actuating member. 3. The drawing arrangement as defined in claim 2, wherein said actuating member has a lower contact surface; and wherein said lifting device acts on said contact surface. 4. The drawing arrangement as defined in claim 3, wherein said actuating member is partially accommodated in said recess and has a first annular portion received in said recess and cooperating with said abutments means to delimit the extent of movement of said actuating member in the retracting direction, and a second annular portion situated upwardly of said contact surface; and wherein said spring extends between said second annular portion of said actuating member and said first tool within the confines of the latter. 5. A drawing arrangement for use in a machine, particularly in a cutting and pressing machine having a numerically controlled coordinate table, in which a descending chute for the discards is arranged on the machine, for producing drawn formations on workpieces, comprising a support; a first tool mounted on said support above the descending chute and having an upwardly facing supporting surface for the workpieces arranged in a predetermined plane and a recess which opens onto said supporting surface; a second tool mounted on said support above said first tool for movement in opposite substantially vertical directions toward and away from said first tool upto area contact with the respective workpiece at said supporting surface and including a female drawing die aligned in said opposite directions with said recess of said tool; a drawing punch mounted on said first tool within said recess for movement between an extended position in which it extends beyond said supporting surface toward said female drawing die and a retracted position in which it is fully retracted into said recess of said first tool and is at most flush with said supporting surface of said first tool; an actuating member carrying said male punch, movable in extending and retracting directions relative to said first tool, and having a lower contact surface; abutment means for delimiting the extent of movement of said actuating member in the retracting direction; biasing means including at least one spring for urging said actuating member toward said abutment means; means for moving said actuating member in opposition to the force of said biasing means in the extending direction, including a lifting device disposed below said first first tool and having an operating member movable from its first position fully below the descending chute toward its second position in which it contacts said contact surface of said actuating member and extends across said descending chute, and back to the first position after the drawing operation; and a connecting chute section movable between a first position in which it extends across the path of movement of said operating member and constitutes a part of the descending chute and a second position in which it is situated out of the path of movement of said operating member. 6. The drawing arrangement as defined in claim 5, wherein said connecting chute section is pivotally mounted on the descending chute. 7. The drawing arrangement as defined in claim 5; and further comprising means for moving said connecting chute section between said first and second positions thereof in dependence on the movement of said operating member. 8. The drawing arrangement as defined in claim 5, wherein said lifting device further includes means for moving said operating member from its first position at a higher speed until said operating member contacts said contact surface of said actuating member, and at a lower speed and with a considerable force thereafter during the drawing operation. 9. The drawing arrangement as defined in claim 5, wherein said support includes a transverse beam disposed underneath the descending chute in alignment with the longitudinal axis of said tools; and wherein said lifting device is mounted on said transverse beam.
