Method for forming a wheel bearing apparatus

A method for forming a wheel bearing apparatus where the end portion of the cylindrical portion is pre-formed as a cylinder prior to its plastic deformation to form the caulking portion. A caulking tool with a punch and a swing shaft abuts against the end portion of the cylinder at a predetermined inclined angle relative to the inner circumferential surface of the cylinder. Teeth on the punch form the face-spline by plastically deforming the end face of the caulking portion. The swing shaft central axis is inclined at an angle relative to a central axis of the wheel hub. The face-spline is formed simultaneously with the formation of the caulking portion by advancing the caulking tool toward the wheel hub. A main shaft is rotated to cause a swing motion of the caulking tool.

METHOD FOR PRODUCING ISOPROPYL ALCOHOL

A method for producing isopropyl alcohol is provided in which propylene is hydrated directly with water to produce isopropyl alcohol, the method including: a distillation step in which crude isopropyl alcohol is distilled; and a filtration step in which the isopropyl alcohol obtained in the distillation step is filtered through a filter having an ion-exchange group.

Forging method, molding device for forgings, and tripod uniform motion universal joint

After molding a product-to-be-preliminarily-molded to form a preliminarily molded product as a material, the preliminarily molded product is put into a full-enclosed forging die so that a product is molded with the full-enclosed forging die. On a preliminary leading-end surface to be formed as a leading end surface of a shaft portion of the product formed of the preliminarily molded product, there is formed a shear-drop suppressing portion for suppressing thickness reduction on a boss-portion side of an outer peripheral portion of the leading end surface of the shaft portion of the product. At a time of putting the preliminarily molded product into the full-enclosed forging die so as to mold the product, a relief portion is formed between the leading end surface of the shaft portion to be formed and a cavity of the full-enclosed forging die.

Wheel bearing device and method of crimping the same

A wheel bearing device having an outer ring with an attachment flange and two rows of raceway surfaces in the inner periphery, a hub ring having a wheel-attaching flange and one raceway surface in the outer periphery, an inner ring fitted on a stepped portion of the hub ring and having the other raceway surface in the outer periphery, and two rows of rolling elements. The end of the hub ring is crimped for integration, wherein the pre-crimping end on the hub ring is a hollow cylindrical portion with wall-thickness gradually increases toward the front end. Crimping imparts preload to the rolling elements and is effected by measuring the before-crimping axial dimension and controlling the lower dead point of a crimping punch according to the axial dimension so that the worked head height of the crimp portion is made constant.

Stainless steel member and production method thereof

The purpose of the present invention is to provide a stainless steel member and a production method thereof, said stainless steel member having a passivation layer formed on a surface of a base material formed from stainless steel, wherein the film thickness of the passivation layer is 2-20 nm, and the concentration of chromium atoms in the outermost surface of the passivation layer is 0.1-2.3 by atomic percentage. Also provided are a device or container, the liquid-contact part of which in contact with a semiconductor treatment liquid is formed from the stainless steel member, a semiconductor treatment liquid production method for producing the semiconductor treatment liquid by using the device, and a semiconductor treatment liquid storage method for storing the semiconductor treatment liquid in the container.

Wheel bearing device

An object of the present invention is to prevent occurrence of play between a hub ring and a stem portion of a joint outer ring. In a wheel bearing device in which a hub ring, a double-row bearing and a constant velocity universal joint are unitized together, one of double-row inner raceways of a bearing is formed on the joint outer ring of the constant velocity universal joint, and an end portion of the joint outer ring is fitted to an outside periphery of the hub ring through serrated portions, wherein the hub ring is plastically deformed and expanded from an inside diameter side toward an outside diameter side by pushing a steel ball into a through hole of the hub ring, and play in the serrated portions is prevented by the diameter expansion. Another object of the present invention is to make a bearing device more compact and to increase its rigidity. A joint outer ring is fitted onto an outside periphery of a hub ring with torque transmission means being provided between them, and the ...

Method For Forming A Wheel Bearing Apparatus

A method for forming a wheel bearing apparatus where the end portion of the cylindrical portion is pre-formed as a cylinder prior to its plastic deformation to form the caulking portion. A caulking tool with a punch and a swing shaft abuts against the end portion of the cylinder at a predetermined inclined angle relative to the inner circumferential surface of the cylinder. Teeth on the punch form the face-spline by plastically deforming the end face of the caulking portion. The swing shaft central axis is inclined at an angle relative to a central axis of the wheel hub. The face-spline is formed simultaneously with the formation of the caulking portion by advancing the caulking tool toward the wheel hub. A main shaft is rotated to cause a swing motion of the caulking tool.

Method for producing isopropyl alcohol

A method for producing isopropyl alcohol is provided in which propylene is hydrated directly with water to produce isopropyl alcohol, the method including: a distillation step in which crude isopropyl alcohol is distilled; and a filtration step in which the isopropyl alcohol obtained in the distillation step is filtered through a filter having an ion-exchange group.

Wheel bearing device

A wheel bearing device having a unitized hub ring, double-row bearing and constant velocity universal joint with one of double-row inner raceways formed on the joint outer ring. An end portion of the joint outer ring is fitted to an outside periphery of the hub ring through serrated portions. The hub ring is plastically deformed and expanded from an inside diameter side toward an outside diameter side by pushing a steel ball into a through hole of the hub ring preventing play in the serrated portions by the diameter expansion. A surface-hardened layer is formed at least on a base portion of the wheel mounting flange.

WHEEL BEARING DEVICE

A wheel bearing device includes a hub ring, a double-row bearing and a constant velocity universal joint which are unitized together. At least one of double-row inner raceways of the bearing and a wheel mounting flange are formed on a hub ring. The hub ring and a stem portion of a joint outer ring of the constant velocity universal joint are fitted through a torque transmission assembly, wherein a pilot member as a separate element having a wheel guide portion and a brake guide portion is fitted to a side-end portion of the wheel mounting flange of the hub ring, and the hub ring and the pilot member are fixed to the joint outer ring by swaging.

Wheel bearing device

A wheel bearing device includes a hub ring, a double-row bearing and a constant velocity universal joint which are unitized together. At least one of double-row inner raceways of the bearing and a wheel mounting flange are formed on a hub ring. The hub ring and a stem portion of a joint outer ring of the constant velocity universal joint are fitted through a torque transmission assembly, wherein a pilot member as a separate element having a wheel guide portion and a brake guide portion is fitted to a side-end portion of the wheel mounting flange of the hub ring, and the hub ring and the pilot member are fixed to the joint outer ring by swaging.

FORGING METHOD, MOLDING DEVICE FOR FORGINGS, AND TRIPOD UNIFORM MOTION UNIVERSAL JOINT

Provided are a forging method, a forged-product molding apparatus, and a tripod type constant velocity universal joint which contribute to reduction of shear drop and avoidance of an increase in processing load generated through contact of a leading end surface of a shaft portion and dies even when an excessively-heavy raw material is mixed so that a life of the die can be prolonged. After molding a product-to-be-preliminarily-molded to form a preliminarily molded product ( 20 A) as a material, the preliminarily molded product ( 20 A) is put into a full-enclosed forging die ( 30 ) so that a product is molded with the full-enclosed forging die ( 30 ). On a preliminary leading-end surface to be formed as a leading end surface ( 17 a ) of a shaft portion ( 17 ) of the product formed of the preliminarily molded product ( 20 A), there is formed a shear-drop suppressing portion ( 65 ) for suppressing thickness reduction on a boss-portion side of an outer peripheral portion of the leading end surface ( 17 a ) of the shaft portion ( 17 ) of the product ( 16 ). At a time of putting the preliminarily molded product ( 20 A) into the full-enclosed forging die ( 30 ) so as to mold the product ( 16 ), a relief portion ( 26 ) is formed between the leading end surface ( 17 a ) of the shaft portion ( 17 ) to be formed and a cavity ( 24 ) of the full-enclosed forging die ( 30 ).

Tripod type constant-velocity universal joint and method for producing the same

A manufacturing method for a tripod type constant velocity universal joint includes, when forging a raw-shaped material corresponding to each of three journals into a journal shape using a molding surface of a die and in a state where a relief portion is provided on a raw-shaped-material-leading-end-side of the die, molding an outer peripheral surface of the raw-shaped material into a projected round shape. The molding occurring with a tapered surface formed on the molding surface with which the outer peripheral surface of the raw-shaped material is held in contact and a recessed round surface formed between the molding surface and the tapered surface.

Constant velocity universal joint outer joint member and manufacturing method for same

A cup member has a cylindrical portion, a bottom portion, and a short shaft portion having a solid shaft shape and including a joining end surface at an end portion thereof. A shaft member has a solid shaft shape and includes a joining end surface at one end thereof. The joining end surfaces of the cup and shaft members are brought into abutment against each other and welded from a radially outer side to form a welded portion. At this time, center segregation is prevented from interfering with the welded portion. The cup member is formed by forging including upsetting a billet having a columnar shape successively in a plurality of stages, extruding the cylindrical portion and the short shaft portion, and ironing the cylindrical portion. In the course of the upsetting, a region of the billet corresponding to a bottom side of the cup member is narrowed.

Wheel bearing device

A wheel bearing device having a unitized hub ring, double-row bearing and constant velocity universal joint with one of double-row inner raceways formed on the joint outer ring. An end portion of the joint outer ring is fitted to an outside periphery of the hub ring through serrated portions. The hub ring is plastically deformed and expanded from an inside diameter side toward an outside diameter side by pushing a steel ball into a through hole of the hub ring preventing play in the serrated portions by the diameter expansion. A surface-hardened layer is formed at least on a base portion of the wheel mounting flange.

Wheel bearing device

A wheel bearing device includes a hub ring, a double-row bearing and a constant velocity universal joint wherein at least the hub ring and the double-row bearing are unitized together. The hub ring and constant velocity universal joint are fitted through a torque transmission assembly and are joined by a fastener in an axial direction. A clearance in a fit portion of the torque transmission assembly is prevented by a play prevention member.

STAINLESS STEEL MEMBER AND PRODUCTION METHOD THEREOF

The purpose of the present invention is to provide a stainless steel member and a production method thereof, said stainless steel member having a passivation layer formed on a surface of a base material formed from stainless steel, wherein the film thickness of the passivation layer is 2-20 nm, and the concentration of chromium atoms in the outermost surface of the passivation layer is 0.1-2.3 by atomic percentage. Also provided are a device or container, the liquid-contact part of which in contact with a semiconductor treatment liquid is formed from the stainless steel member, a semiconductor treatment liquid production method for producing the semiconductor treatment liquid by using the device, and a semiconductor treatment liquid storage method for storing the semiconductor treatment liquid in the container. 1. An austenite stainless steel member comprising:a base material made of austenite stainless steel; anda passivation layer formed on a surface of the base material made of austenite stainless steel,wherein the passivation layer has a thickness of 2 nm to 20 nm, a concentration of chromium atoms in an outermost surface of the passivation layer is 0.1 atomic % to 1.0 atomic %, and a concentration of silicon atoms in the outermost surface of the passivation layer is 2 atomic % to 10 atomic %.2. The austenite stainless steel member according to which is for use in a part to be in contact with a semiconductor treatment liquid.3. (canceled)4. The austenite stainless steel member according to claim 1 , wherein the passivation layer has a thickness of 3 nm to 20 nm.5. An apparatus having a part to be in contact with a semiconductor treatment liquid claim 1 , wherein the part comprises the austenite stainless steel member according to .6. A method of producing a semiconductor treatment liquid claim 1 , the method comprising:{'claim-ref': {'@idref': 'CLM-00005', 'claim 5'}, 'using the apparatus according to in producing a semiconductor treatment liquid.'}7. A method ...

Closed forging die and forging method

The present invention provides a closed forging die and a forging method with which sagging can be reduced, a constant velocity joint and a universal joint can be made compact and lightweight, remove of a shaft tip thereof by machining prior to heat treatment is not required, and material costs and machining costs can be reduced. The closed forging die according to the present invention includes openable dies (11, 12), and punches (14, 15) that move in an opening/closing direction of the dies (11, 12) to pressurize a material in the dies (11, 12). By using the die, a product (16) having shaft portions (17) formed radially is manufactured. A clearance (26) is provided to each of the formed shaft portions (17) between a tip surface (17a), and abutting portions (25) are provided to the dies side abutting against at least a tip side of an outer circumferential surface of the shaft portions (17).

Closed forging die and forging method

A closed forging die and a forging method with which sagging can be reduced, a constant velocity joint and a universal joint can be made compact and lightweight, removal of a shaft tip thereof by machining prior to heat treatment is not required, and material costs and machining costs can be reduced by using a closed forging die includes openable dies, and punches that move in an opening/closing direction of the dies to pressurize a material in the dies. By using the die, a product having shaft portions formed radially is manufactured. A clearance is provided to each of the formed shaft portions between a tip surface, and abutting portions are provided to the dies side abutting against at least a tip side of an outer circumferential surface of the shaft portions.

Wheel bearing device

A wheel bearing device includes a hub ring, a double-row bearing and a constant velocity universal joint which are unitized together. At least one of double-row inner raceways of the bearing and a wheel mounting flange are formed on a hub ring. The hub ring and a stem portion of a joint outer ring of the constant velocity universal joint are fitted through a torque transmission assembly, wherein a pilot member as a separate element having a wheel guide portion and a brake guide portion is fitted to a side-end portion of the wheel mounting flange of the hub ring, and the hub ring and the pilot member are fixed to the joint outer ring by swaging.

Wheel bearing device and method of crimping the same

A wheel bearing device having an outer ring with an attachment flange and two rows of raceway surfaces in the inner periphery, a hub ring having a wheel-attaching flange and one raceway surface in the outer periphery, an inner ring fitted on a stepped portion of the hub ring and having the other raceway surface in the outer periphery, and two rows of rolling elements. The end of the hub ring is crimped for integration, wherein the pre-crimping end on the hub ring is a hollow cylindrical portion with wall-thickness gradually increases toward the front end. Crimping imparts preload to the rolling elements and is effected by measuring the before-crimping axial dimension and controlling the lower dead point of a crimping punch according to the axial dimension so that the worked head height of the crimp portion is made constant.

Forging method, closed forging mold and tripod uniform motion universal joint

A forging method and a full-enclosed forging die contribute to the alleviation of an enclosing force applied to dies and in which a relatively small enclosing apparatus can be used even with respect to larger-sized products. A tripod type constant velocity universal joint is formed with a tripod member molded with the full-enclosed forging die. The full-enclosed forging die includes openable/closable dies and punches for pressing a material between the dies. From the forging die, the tripod member including a boss portion and shaft portions protruded radially from the boss portion is molded.

Forging method, molding device for forgings, and tripod uniform motion universal joint

After molding a preliminarily molded product as a material, the preliminarily molded product is put into a full-enclosed forging die so that a product is molded with the full-enclosed forging die. A shear-drop suppressing portion for suppressing thickness reduction on a boss-portion side of an outer peripheral portion of a leading end surface of each of shaft portions of the product is formed on the preliminary leading-end surface configuring a leading end surface of each of the shaft portions of the product in the preliminarily molded product. When the preliminarily molded product is put into the full-enclosed forging die and the product is to be molded, a relief portion is formed between the leading end surface of each of the shaft portions to be molded and a cavity of the full-enclosed forging die.

FORGING METHOD, CLOSED FORGING MOLD AND TRIPOD UNIFORM MOTION UNIVERSAL JOINT

Provided are a forging method and a full-enclosed forging die which contribute to alleviation of an enclosing force applied to dies and in which a relatively small enclosing apparatus can be used even with respect to larger-sized products. Further, provided is a tripod type constant velocity universal joint using a tripod member molded with such a full-enclosed forging die. Using a full-enclosed forging die including openable/closable dies (11, 12) and punches (14, 15) for pressing a material between the dies (11, 12), a product (tripod member) (16) including a boss portion (18) and shaft portions (17) protruded radially from the boss portion (18) is molded. A projection area in a boss-portion axial direction toward a die (11, 12) side of the boss portion (18) is made to be smaller than another projection area in the boss-portion axial direction toward the die side, the another projection area being defined when a radially outer surface is formed as a single convex curved surface about ...

TRIPOD TYPE CONSTANT-VELOCITY UNIVERSAL JOINT AND METHOD FOR PRODUCING THE SAME

Provided is a manufacturing method for a tripod type constant velocity universal joint including: an outer joint member having an inner peripheral surface provided with: three track grooves extending in an axial direction; and roller-guide surfaces extending in the axial direction on both sides of each of the three track grooves; a tripod member including three journals each projected into a radial direction; and a roller unit supported rotatably around each of the three journals of the tripod member and inserted rollably in each of the three track grooves of the outer joint member, the manufacturing method including, when forging a raw-shaped material corresponding to each of the three journals into a journal shape with use of a molding surface of a die, under a state in which a relief portion is provided on a raw-shaped-material-leading-end-side of the die, molding an outer peripheral surface of the raw-shaped material into a projected round shape with use of a tapered surface formed on the molding surface with which the outer peripheral surface of the raw-shaped material is held in contact and a recessed round surface formed between the molding surface and the tapered surface. 1. A manufacturing method for a tripod type constant velocity universal joint comprising: three track grooves extending in an axial direction; and', 'roller-guide surfaces extending in the axial direction on both sides of each of the three track grooves;, 'an outer joint member having an inner peripheral surface provided witha tripod member comprising three journals each projected into a radial direction; anda torque transmitting member supported rotatably around each of the three journals of the tripod member and inserted rollably in each of the three track grooves of the outer joint member,the manufacturing method comprising, when forging a raw-shaped material corresponding to each of the three journals into a journal shape with use of a molding surface of a die, under a state in which a ...

Wheel bearing device

A wheel bearing device having a unitized hub ring, double-row bearing and constant velocity universal joint with one of double-row inner raceways formed on the joint outer ring. An end portion of the joint outer ring is fitted to an outside periphery of the hub ring through serrated portions. The hub ring is plastically deformed and expanded from an inside diameter side toward an outside diameter side by pushing a steel ball into a through hole of the hub ring preventing play in the serrated portions by the diameter expansion. A surface-hardened layer is formed at least on a base portion of the wheel mounting flange.

FORGING METHOD, MOLDING DEVICE FOR FORGINGS, AND TRIPOD UNIFORM MOTION UNIVERSAL JOINT

After molding a product-to-be-preliminarily-molded to form a preliminarily molded product as a material, the preliminarily molded product is put into a full-enclosed forging die so that a product is molded with the full-enclosed forging die. On a preliminary leading-end surface to be formed as a leading end surface of a shaft portion of the product formed of the preliminarily molded product, there is formed a shear-drop suppressing portion for suppressing thickness reduction on a boss-portion side of an outer peripheral portion of the leading end surface of the shaft portion of the product. At a time of putting the preliminarily molded product into the full-enclosed forging die so as to mold the product, a relief portion is formed between the leading end surface of the shaft portion to be formed and a cavity of the full-enclosed forging die. 15-. (canceled)6. A forged-product molding apparatus , comprising:a full-enclosed forging die for product molding, which comprises openable/closable dies and punches for pressing a material between the openable/closable dies, which is capable of molding a product comprising a boss portion and shaft portions protruded radially from the boss portion, and in which a relief portion is formed between a cavity and each of the shaft portions at a time of molding; anda preliminarily-molded-product die for molding a product-to-be-preliminarily-molded as the material comprising a shear-drop suppressing portion for suppressing thickness reduction toward a boss-portion side of an outer peripheral portion of a leading end surface of each of the shaft portions of the product, the shear-drop suppressing portion being formed on a preliminary leading-end surface to be formed as the leading end surface of each of the shaft portions of the product.7. A forged-product molding apparatus according to claim 6 , wherein a regulating portion with which a part or an entire of the leading-end outer peripheral portion of each of the shaft portions comes ...

CONSTANT VELOCITY UNIVERSAL JOINT OUTER JOINT MEMBER AND MANUFACTURING METHOD FOR SAME

A cup member has a cylindrical portion, a bottom portion, and a short shaft portion having a solid shaft shape and including a joining end surface at an end portion thereof. A shaft member has a solid shaft shape and includes a joining end surface at one end thereof. The joining end surfaces of the cup and shaft members are brought into abutment against each other and welded from a radially outer side to form a welded portion. At this time, center segregation is prevented from interfering with the welded portion. The cup member is formed by forging including upsetting a billet having a columnar shape successively in a plurality of stages, extruding the cylindrical portion and the short shaft portion, and ironing the cylindrical portion. In the course of the upsetting, a region of the billet corresponding to a bottom side of the cup member is narrowed. 1. An outer joint member of a constant velocity universal joint , comprising:a cup member; anda shaft member,the outer joint member being manufactured by joining the cup member and the shaft member,the cup member having a bottomed cylindrical shape that is opened at one end, and comprising a cylindrical portion, a bottom portion, and a short shaft section protruding from the bottom portion, the short shaft portion having a solid shaft shape, and comprising a joining end surface at an end portion thereof,the shaft member having a solid shaft shape, and comprising a joining end surface at one end thereof,the joining end surface of the cup member and the joining end surface of the shaft member being brought into abutment against each other and welded to form a welded portion having an annular shape, to prevent interference of center segregation with the welded portion.2. A method of manufacturing an outer joint member of a constant velocity universal joint claim 1 , when the outer joint member of a constant velocity universal joint of is to be manufactured claim 1 , the method comprising: upsetting a billet having a ...

Cold forming method and apparatus

A cold forming method for plastic deformation of toothed ring-shaped products WO having a tooth profile portion T in at least one of the outer or inner peripheral surfaces thereof utilises die 1 with a tooth forming part 4 and a tip shaping part 5 positioned in the groove of the tooth forming part 4. A ring-shaped blank W is pressed and passed into the die 1 by a punch 2. When processing a ring-shaped product having a tooth profile portion in an inner peripheral surface, the tooth forming part 4 and tip shaping part 5 are provided on the outer circumference of a lower punch, and the blank is pressed and passed into the lower punch by an upper punch (Fig. 10A).

Method for forming a wheel bearing device

An object of the present invention is to provide a method for forming a wheel bearing apparatus which can simplify the caulking tool and thus reduce the manufacturing cost and also prevent generation of burrs and thus improve the quality of the wheel bearing apparatus. According to the present invention, there is provided a method for forming a wheel bearing apparatus characterized in that the end portion of the cylindrical portion is pre-formed as a cylinder prior to its plastic deformation to form the caulking portion; that a caulking tool comprises a punch and a swing shaft, the punch having a nose portion projected from a bottom surface of the punch at its center adapted to be abutted against the end portion of the cylinder at a predetermined inclined angle relative to the inner circumferential surface of the cylinder and teeth formed around the nose portion for forming the face-spline by plastically deforming the end face of the caulking portion, and the swing shaft having the punch rigidly secured thereon so that the phase of the punch is not shifted relative to the hub wheel and also having a central axis forming a predetermined inclined angle relative to a central axis of the hub wheel; and that the face-spline is formed simultaneously with the formation of the caulking portion by advancing the caulking tool toward the hub wheel, pushing the punch against the end portion of the cylinder with a predetermined working force, and then rotating a main shaft having a rotational axis corresponding to the central axis of the hub wheel to cause a swing motion of the caulking tool.

Method for forming a wheel bearing device

Method for manufacturing constant velocity joint and constant velocity joint outer ring

【課題】 鍛造加工後の後加工を低減して加工工数の低減を図り、歩留りの向上、製造コストの低減が図れ、かつ等速ジョイント外輪のねじり強度等の強度の確保が容易な等速ジョイントおよび等速ジョイント外輪の製造方法を提供する。 【解決手段】 外輪１が浸炭鋼等ではなく特に機械構造用炭素鋼から成り、この外輪１のトラック溝３、内径球面２ａ、カップ入口チャンファ１１、トラックチャンファ１２、および、トラック入口チャンファ１３を含むカップ部分１ａの内表面全体を冷間鍛造により仕上げ、ブーツ溝を除くカップ部分１ａの外表面を冷間鍛造により仕上げる。 【選択図】 図３

トリポード型等速自在継手およびその製造方法

【課題】 素形材の重量を増大させることなく、製造工数の削減を可能とし、また、脚軸の鍛造加工も容易にする。 【解決手段】 内周面に軸方向に延びる三本のトラック溝が形成され、各トラック溝の両側でそれぞれ軸方向に延びるローラ案内面を有する外輪と、径方向に突出した三本の脚軸を有するトリポード部材と、トリポード部材の脚軸に回転自在に支持されると共に外輪のトラック溝に転動自在に挿入されたローラユニットとを備えたトリポード型等速自在継手の製造方法であって、脚軸の素形材５２を金型６０の成形面６４で脚軸形状に鍛造するに際し、金型６０の素形材先端側に逃げ部６２を設けた状態で、素形材５２の外周面５４が接する成形面６４に形成されたテーパ面６６と、成形面６４とテーパ面６６との間に形成された凹Ｒ面６１とで、素形材５２の外周面５４を凸Ｒ状に成形する。 【選択図】 図１

等速ジョイント、等速ジョイント外輪の外輪前素材、および等速ジョイント外輪の製造方法

【課題】 鍛造加工後の後加工を低減して加工工数の低減を図ると共に、歩留りの向上を図り、製造コストの低減を図ることができ、また、等速ジョイント外輪の球形内面の必要面積が確保できて、強度不足の問題が生じず、かつ余肉の突出による形状精度の低下、後加工の必要性の問題を生じない等速ジョイント、等速ジョイント外輪の外輪前素材、および等速ジョイント外輪の製造方法を提供する。 【解決手段】 外輪は機械構造用炭素鋼から成り、カップ部分の内表面全体が冷間鍛造により仕上げられ、外輪の内径球面２ａに軸方向に沿ったスリット溝Ｓｍを形成し、周方向に隣接するトラック溝３，３間における内径球面２ａの最大幅寸法Ｓ２に対して、スリット溝Ｓｍの幅寸法Ｓ１を５％以上３０％以下とした。 【選択図】 図５

包装箱

【課題】開封しなくても収納物を利用することができる包装箱を提供する。 【解決手段】包装箱１は、一枚の板紙を折り曲げて形成され、３面以上の外壁１１と、この外壁１１に対応して設けられた３面以上の内壁１２とにより、中空筒状体１０が形成された二重壁構造を有している。中空筒状体１０の他方の端部は、外壁１１に連続して設けられた外側組合部３２と、この外側組合部３２及び内壁１２に連続して設けられた内側組合部３３とを組み合わせることにより、周縁部が覆われており、中心部には開口３４が形成されている。外壁１１の長さは内壁１２の長さよりも長く、外側組合部３２は、外壁１１から内側組合部３３に向かい中空筒状体１０の一方の端部側に傾斜している。 【選択図】図２

Tripod constant-velocity universal joint and method for producing the same

Forging method, closed forging mold and tripod uniform motion universal joint

熱間鍛造用ダイセット

【課題】 熱間鍛造用ダイセットにおける上ダイセットの上ガイドポストと下ダイセットの下ガイドポストとの摺動面が、熱膨張前及び熱膨張後の何れであっても適切な摺動クリアランスを確保できるようにして、当該摺動面の焼き付きを防止しつつ上ダイセットと下ダイセットとを高精度に位置決めすることを可能にし、高品質の鍛造品を得る。 【解決手段】 上ダイセットと下ダイセット２との何れか一方または双方に熱源を有し、下ガイドポスト３及び上ガイドポスト４に、熱源を有するダイセット２の熱膨脹に伴ってそのダイセット２のガイドポスト３が水平面内で移行する方向と概ね平行な第１摺動平面３ａ、４ａをそれぞれ形成すると共に、この第１摺動平面３ａ、４ａと直角もしくは略直角とされ且つ上記熱膨張に伴って摺動クリアランスＣ２が大きくなり得る第２摺動平面３ｂ、４ｂをそれぞれ形成する。 【選択図】図１

Forging method, closed forging mold and tripod uniform motion universal joint