JP5087299B2 - Mold apparatus and molding method for outer race for constant velocity joint with shaft - Google Patents

Description

  The present invention relates to a molding die apparatus and a molding method for an outer race for a constant velocity joint with a shaft for sizing molding of an outer race for a constant velocity joint with a shaft such as a tripod type or a bar filled type, and in particular, between the outer race and the shaft portion. The present invention relates to a molding device and a molding method for an outer race for a constant velocity joint with a shaft suitable for ensuring high coaxiality.

  Conventionally, in order to ensure the coaxiality between the outer race and the shaft portion, a forging gold that forms a desired hole in the forging material (formation of the outer race) on the forging material and forms a center hole at the shaft end in one molding operation. A mold apparatus has been proposed (see Patent Document 1).

The first assembly includes a punch for forming a center hole in a forging material, a first guide, and a first molded body for performing a predetermined forging at a predetermined portion of the forging material. A forging die apparatus comprising: a second forming body for performing predetermined forging forming on a predetermined portion of the forging material; and a second assembly portion including a second guide. The punch and the first guide are arranged coaxially, the second molded body and the second guide are arranged coaxially, and the first assembly part and the second assembly part After the forging material is formed based on a forming operation in which the other is moved relative to the other, the first guide and the second guide are relatively guided coaxially with each other. And forming a center hole in the forging material by the punch. It is way.
JP-A-2005-66616

  However, in the above conventional example, since the shaft portion is not restrained during the sizing of the cup portion, the workpiece posture with respect to the mandrel is expected to change due to an offset load during sizing. There is a concern that the shaft runout as evidenced by the cup part is larger than the workpiece before sizing.

  Accordingly, the present invention has been made in view of the above problems, and provides a molding device and a molding method for an outer race for a constant velocity joint with a shaft, which is suitable for securing a high degree of coaxiality between a cup portion and a shaft portion. For the purpose.

The present invention relates to a molding method for molding an outer race for a constant velocity joint with a shaft integrally including a cup portion formed with a plurality of rollers or ball rolling grooves on an inner peripheral surface and a shaft portion connected to the cup portion by plastic working. And a fitting hole that is arranged at the piston rod of the cylinder device arranged in parallel to the axis of the sizing die in the mold on the side including the sizing die or engaged with the shaft portion of the coarse material. The inner peripheral surface shape of the outer race of the constant velocity joint is configured by the holding tool, the mold on the extension of the axis of the fitting hole, and the disengagement pin erected toward the holding tool to constitute the shaft restraining means. A sizing having an outer peripheral surface shape engraved on the inner peripheral surface shape of the outer race of the constant velocity joint on the inner peripheral surface of the cup portion of the coarse material provided with a cup portion with a shaft whose inner peripheral surface is roughly molded so as to approximate The wrench is fitted, a shaft portion connected to the cup portion of the coarse material, by penetrating the sizing die, in the axial direction while maintaining the axis and concentric of the sizing die by the cylinder device in the axial restraining means in its forward The outer periphery of the cup part of the coarse material is held in the fitting hole of the movable holding tool , and the cylinder device is contracted and the holding tool is retracted as the sizing process proceeds in the holding state by the fitting hole of the holding tool. The sizing die is subjected to ironing to sizing the inner peripheral surface of the cup part to the inner peripheral surface shape of the outer race of the constant velocity joint, and after the sizing process is completed, the retainer is further retracted by the cylinder device , The shaft portion of the coarse material is pressed from the fitting hole of the holder by pressing the shaft portion of the coarse material by the engagement release pin erected on the mold extending on the axis of the fitting hole holding the shaft portion of the material. Leave And characterized in that.

In addition, as a molding die apparatus that achieves the above-described method, an outer peripheral surface shape engraved on the inner peripheral surface shape of the outer race of the constant velocity joint is provided, and approximates to the inner peripheral surface shape of the outer race of the constant velocity joint in advance. A sizing punch that fits into the cup portion of the rough material having a cup portion with a shaft whose inner peripheral surface is roughly formed, and the inner periphery of the rough material cup portion by ironing the outer periphery of the cup portion of the rough material A sizing die that molds the surface into the shape of the outer peripheral surface of the sizing punch, and is arranged so as to be movable in the axial direction while maintaining the concentric state with the axis of the sizing die. And a shaft restraining means for guiding the shaft portion of the coarse material in the axial direction of the sizing die when forming the coarse cup portion by the sizing die. The shaft restraining means comprises a sizing die. Is disposed on the piston rod or the piston rod end side of the die cylinder apparatus arranged parallel to the axis of the sizing die, the holder comprising a fitting hole which engages with the shaft portion of the coarse material, the fitting hole And a disengagement pin erected toward the holder on the mold extending on the axis of the shaft , and the holder is sizing the shaft of the coarse material at the position advanced by the cylinder device. Prior to the fitting, the fitting hole is fitted and held, and at the position retracted by the cylinder device, the shaft portion of the coarse material held in the fitting hole is pressed by the engagement release pin to It is made to detach.

Therefore, in the present invention, the shaft portion connected to the cup portion of the rough material is passed through the sizing die and held by the shaft restraining means movable in the axial direction while maintaining the concentric state with the axial center of the sizing die in front of the sizing die. In the holding state by the shaft restraining means, the outer periphery of the rough cup part is ironed with a sizing die, and the inner peripheral surface of the cup part is finished to the inner peripheral surface shape of the outer race of the constant velocity joint. The workpiece shaft runout after processing is corrected with respect to the workpiece before sizing processing, so that a highly accurate outer race for a constant velocity joint can be obtained.
Also, a holding die provided with a fitting hole that is arranged at the piston rod of the cylinder device arranged in parallel with the axis of the sizing die or the tip of the piston rod in the mold on the side provided with the sizing die and engages the shaft portion of the coarse material. A shaft restraint means is configured by the tool and an engagement release pin that is erected toward the holder on the mold on the extension of the axis of the fitting hole. For this reason, when the holder is moved forward by the cylinder device, the shaft portion of the coarse material is fitted and held in the fitting hole prior to sizing, and at the position retracted by the cylinder device, the fitting is held. The shaft portion of the rough material held in the joint hole can be pressed and released from the fitting hole by the disengagement pin, and even if the shaft portion of the workpiece is caught in the fitting hole of the restraining means, It is possible to knock out reliably by the mating release pin.
In addition, the compressed air from the external air pressure source can be used as a drive source, and it can be operated without requiring a mechanism for driving the shaft restraining means up and down by using the sliding movement of the press machine.
Further, in one cycle of sizing molding, the shaft portion is constrained only at the time of sizing, and at other times, the workpiece can be easily discharged after sizing.

  Hereinafter, an embodiment of a molding device and a molding method for an outer race for a constant velocity joint with a shaft according to the present invention will be described with reference to FIGS. 1 is a cross-sectional view of a molding die apparatus according to a first embodiment to which the present invention is applied, FIG. 2 is an enlarged view of a main part of the molding mold apparatus shown in FIG. 1, and FIGS. Sectional drawing explaining a formation process, FIG. 8: is sectional drawing and the side view of the molded product of the outer race for constant velocity joints with a shaft obtained.

  In FIG. 1, an outer race molding die device 1 for a constant velocity joint with a shaft according to this embodiment includes a lower die 2 that supports a sizing punch 4 (mandrel), and an upper die 3 that supports a sizing die 5. One of these upper mold 3 and lower mold 2 (for example, lower mold 2) is fixed to a fixed base fixed to a frame of a press machine (not shown), and the other (for example, upper mold 3) is illustrated. It is fixedly arranged on a slide base that is guided by guide means of a press machine that does not move up and down.

  The lower mold 2 includes a columnar mandrel base 7 fixedly supported on a base plate 6 fixed to a fixed base (not shown), and is erected on the mandrel base 7 so as to have an inner peripheral surface shape of an outer race of a constant velocity joint. A sizing punch 4 (mandrel) having a die-carved outer peripheral shape is fixedly provided. The sizing die 5 disposed in the upper die 3 is fitted to and held in the sizing punch 4 by holding and holding the cup portion W1 of the coarse material molded product W of the outer race for the constant velocity joint with a shaft formed into a cup shape in the previous process. This constitutes the inner peripheral mold of the cup portion W1 at the time of sizing processing (ironing processing).

  As shown in detail in FIG. 2, the upper die 3 includes a cylindrical die holder 11 erected downward on a base plate 10 fixed to a slide base (not shown) so as to face the lower die 2, and a die holder 11. A sizing die 5 having a sizing hole 20 fixed to the tip (lower end in the figure) and carved into the outer peripheral surface shape of the outer race for a constant velocity joint. The upper die 3 is fitted into a sizing punch 4 and a shaft restraining means 8 that moves up and down while holding the shaft portion W2 of the workpiece W during and after sizing in the space of the cylindrical die holder 11. A detaching means 12 (stripper) for detaching the molded product W that has been subjected to sizing processing, and a workpiece dispensing device 13 that dispenses the processed workpiece W on the stripper 12 are provided.

The shaft restraining means 8 is a lifting / lowering unit that projects integrally with a cylinder 15 fixed to the base plate 10 side of the inner space of the die holder 11 and a piston 16A that is slidably fitted into the cylinder 15 and projects toward the sizing die 5 side. The piston rod 16B which can be provided, and the holder 17 provided with the fitting hole 21 which is fixed to the front-end | tip of the piston rod 16B, and fits into the axial part W2 of the workpiece | work W.

  When the compressed air is introduced into the upper cylinder chamber 15A, the piston 16A and the piston rod 16B are protruded and lowered, as shown in the drawing, and the detaching means 12 (strippers) arranged with the holding tool 17 at the tip downward. The fitting hole 21 of the holder 12 is formed in the shaft portion W2 of the workpiece W which is relatively raised in the upper mold 3 as the slide base is lowered for sizing. The slide base is lowered along with the sizing process, so that the workpiece W (shaft portion W2) and the upper mold 3 relatively rise together. Further, when the sizing process is completed, compressed air is introduced into the lower cylinder chamber 15 </ b> B, and the piston 16 </ b> A and the piston rod 16 </ b> B are raised to the upper end side of the cylinder 15.

  The piston rod 16B is formed with a stepped hole 22 whose inner diameter is increased on the cylinder side. The head is slid on the large diameter side and the rod portion is slid on the small diameter side. A knockout pin 18 that fits freely is disposed, and this knockout pin 18 is held in the retracted position shown in the figure by a spring 19 disposed between the head and the stepped portion of the stepped hole. At the bottom of the cylinder on the base plate 10 side on the extension of the axis of the knockout pin 18, when the piston 16A and the piston rod 16B are moved upward in the cylinder 15 as described above, the knockout pin 18 A pin 23 is fixed that contacts the head and projects the tip of the knockout pin 18 from the stepped hole 22 of the piston rod 16B.

  The detaching means 12 as the work stripper is capable of moving in and out of the movement locus of the workpiece W, which is sized and relatively raised in the upper mold 3, by a spring or the like as an elastic means from the lateral direction. The claw members 12A are arranged radially around the periphery. The claw member 12A is retracted against the elastic means by being pushed radially outward by the outer periphery of the cup W1 of the workpiece W that passes through the sizing die 5 and relatively rises in the upper mold 3. The tip is kept in contact with the outer periphery of the cup part W1, and when the lower end of the cup part W1 of the workpiece W is moved upward from the claw member 12A after the sizing process is finished, the elastic means on the back part causes the radial direction. It will be inward and can be engaged with the lower end surface of the cup W1 of the workpiece W. Accordingly, when the upper die 3 is raised by the die opening, the workpiece is detached from the sizing punch 4 by engaging with the lower end surface of the cup portion W1 of the workpiece W fitted to the sizing punch 4 that is relatively lowered. Acts to

  The workpiece dispensing device 13 includes a cylinder 13A fixed below the die holder 11, a piston rod 13B that can be moved into and out of the accommodation space of the die holder 11 from the cylinder 13A, and a presser 13C fixed to the tip of the piston rod 13B. Is provided. Then, after the sizing process is completed, the workpiece W, which is separated from the sizing punch 4 by the detaching means 12 and is placed on the claw member 12A of the detaching means 12, is moved forward by the piston rod 13B to open one side of the die holder 11. It has a function of pressing out to the payout port 11A side.

  A method of molding the outer race for a constant velocity joint with a shaft having the above-described configuration by the molding die apparatus will be described in order based on FIGS. 1 and 3 to 7.

  The workpiece W manufactured by this method includes, for example, a shaft portion W2 and a cup portion W1, as shown in FIG. 8, and the cup portion W1 is a straight 3 with which a triport slide roller is engaged on the inner peripheral side. The individual tracks W3 are arranged at equiangular intervals, and the outer peripheral side has a shape protruding outward in the radial direction at the portion where the track W3 is arranged. The central axis of each track W3 on the inner peripheral side and the central axis of the shaft portion W2 are required to be coaxial with high accuracy.

  FIG. 1 shows a molding die apparatus 1 with the upper and lower molds 2 and 3 being opened. On the extension of the axial center of the sizing punch 4 of the lower mold 2, the machining hole 20 and the shaft of the sizing die 5 of the upper mold 3 are shown. The fitting hole 21 of the holder 17 of the restraining means 8, the knockout pin 18 of the piston rod 16B, and the pin 23 arranged at the bottom of the cylinder are arranged concentrically. The workpiece dispensing device 13 positions the piston rod 13B, which has been moved forward in order to dispense the processed workpiece W, in the retracted retracted position, and the piston rod 16B of the shaft restraining means 8 advances downward to hold the tip. 17 is brought into contact with the claw member 12A of the detaching means 12. Note that the position of the piston rod 16 </ b> B of the shaft restraining means 8 may be positioned above the cylinder 15.

  In the sizing process, first, the molded product W formed in the cup with the shaft in the previous process is transported to the molding die apparatus 1 opened by a transport means (not shown), and the shaft portion W2 of the workpiece W is positioned upward. At the same time, the cup part W1 is positioned downward, and the cup part W1 is fitted to the sizing punch 4 of the lower mold 2 and set.

  Next, the lowering of the upper mold 3 is started, and the sizing die 5, the shaft restraining means 8, the detaching means 12, and the workpiece dispensing device 13 of the upper mold 3 start to descend. In this stage, the shaft restraining means 8 may advance the piston rod 16B to bring the tip holding tool 17 into contact with the claw member 12A of the detaching means 12.

  When the upper die 3 is lowered more than a predetermined amount, the shaft portion W2 of the workpiece W held by the sizing punch 4 of the lower die 2 enters the machining hole 20 of the sizing die 5 of the upper die 3 as shown in FIG. Then, it is fitted into the fitting hole 21 of the holder 17 of the shaft restraining means 8. In this state, the cup portion W1 of the workpiece W is held by the sizing punch 4 of the lower die 2 and the shaft portion W2 of the workpiece W is held by the holder 17 of the shaft restraining means 8 of the upper die 3 which is concentric with the lower die 2. Therefore, the workpiece W is positioned with high accuracy in the molding die apparatus 1.

  As the upper die 3 is subsequently lowered, the machining hole 20 of the sizing die 5 is engaged with the upper position of the outer periphery of the cup portion W1 of the workpiece W, and the sizing of the outer periphery of the cup portion W1 is performed by further lowering the upper die 3. Be started. By this sizing process, the shape of the outer periphery of the cup part W1 of the workpiece W is handled by the processing hole 20 of the sizing die 5 to improve the shape accuracy, and the inner periphery of the cup part W1 is pressed against the outer periphery of the sizing punch 4 to be The shape accuracy can also be improved on the circumferential side.

  While the sizing process is continuing, the upper die 3 continues to descend, but the retainer 17 of the shaft restraining means 8 is fitted and held in the sizing punch 4 of the lower die 2 whose fitting hole 21 is stopped. The vertical movement is stopped by engaging with the shaft portion W2 of the workpiece W, and the holding tool 17 and the piston 16A / piston rod 16B are relatively moved upward in the lower mold 3 that is lowered. Accordingly, even during sizing, the shaft portion W2 of the workpiece W is held together with the sizing punch 4 of the lower die 2 by the shaft restraining means 8 of the upper die 3, and the upper and lower portions of the workpiece W are held concentrically with high accuracy. During this sizing, the tip of the claw member 12A of the detaching means 12 is in contact with the outer periphery of the cup W1 of the workpiece W that has slipped out above the sizing die 5 by the pressing force of the elastic means on the back.

  When the upper die 3 is further lowered, the lower end of the outer periphery of the cup W1 of the workpiece W comes out of the machining hole 20 of the sizing die 5, and the sizing process is completed. When the upper mold 3 is further lowered, as shown in FIG. 4, when the cup W <b> 1 of the workpiece W comes out above the claw member 12 </ b> A of the detaching device 12 positioned above the sizing die 5, the claw member 12 </ b> A of the detaching device 12. Is advanced inward in the radial direction by the pressing force of the elastic means at the back, and the tip of the claw member 12A advances into the lower end surface of the cup W1. In this state, the lowering of the upper mold 3 is stopped, and the upper dead center position is reached. The piston 16 </ b> A of the cylinder 15 is in a state of being pushed up with the workpiece W interposed from the lower mold 2 via the holder 17.

  Next, ascending of the upper die 3 is started, and the sizing punch 4 of the workpiece W and the lower die 2 is stopped, so that the upper die 3 moves so as to come out relatively downward from the inside of the upper die 3. By the upward movement of the upper mold 3, the tip of the claw member 12A of the detaching means 12 is caught on the lower end of the cup portion W1 of the workpiece W as shown in FIG.

  As the upper die 3 is further raised, the workpiece W is prevented from being pulled downward by the claw member 12A of the detaching means 12 while the shaft portion W2 is held by the shaft restraining means 8 in the upper die 3. Only the sizing punch 4 of No. 2 comes out relatively downward. In this way, the workpiece W and the lower mold 2 are separated.

  Next, compressed air is introduced into the cylinder chamber 15B below the shaft restraining means 8 and is raised in the cylinder 15 together with the workpiece W held by the piston 16A, the piston rod 16B and the holder 17. As the piston rod 16B rises, the tip of the pin 23 provided at the bottom of the cylinder comes into contact with the head of the knockout pin 18, and when the piston 16A and the piston rod 16B further rise, the pin 23 causes the knockout pin 18 to move to the piston rod 16B. As shown in FIG. 6, the rod of the knockout pin 18 is protruded into the holding tool 17, and the work W is protruded from the holding tool 17 so as to be released, thereby bringing the work W into a free state. Therefore, even if the shaft portion W2 of the workpiece W bites on the holder 17 of the shaft restraining means 8 at this time, it can be detached by knocking out with the knockout pin 18.

  Next, the positions of the piston 16A and the piston rod 16B of the shaft restraining means 8 are left as they are, and as shown in FIG. 7, compressed air is supplied to the cylinder 13A of the workpiece dispensing device 13 to advance the piston rod 13B and The pressing element 13C is brought into contact with the free workpiece W, the workpiece W is pushed out, and sent out from the opening 11A of the die holder 11 to the conveying means for the next process. Then, the workpiece dispensing device 13 returns to the standby position, and the upper die 3 returns to the top dead center, thereby completing one cycle of the molding process.

  In the above-described embodiment, the mold apparatus 1 has been described in which the upper mold 3 is fixed to the slide base and moves up and down, and the lower mold 2 is fixed to the fixed base and does not move up and down. It may be a mold apparatus that is fixed to the slide base and moves up and down and the upper mold is fixed to the fixed base and does not move up and down.

  Moreover, although the said embodiment demonstrated the molding die apparatus 1 which manufactures the tripod type constant velocity joint with a shaft which uses three rollers as a power transmission member as the constant velocity joint W with a shaft, although not shown in figure. Further, it may be a molding die apparatus for manufacturing a bar-filled constant velocity joint with a shaft using three balls as a power transmission member, and is not limited to a constant velocity joint with a shaft. It may be a molding die device that manufactures a shaft-shaped power transmission member that is integrally provided with a cup-shaped member coaxially.

  Further, in the above embodiment, the holder 17 of the shaft restraining means 8 supplies the compressed air to the cylinder chamber 15A on the upper side in the drawing via the piston 16A and the piston rod 16B and pushes it out to approach the detaching means 12. Although described above, although not shown, an urging means such as a compression coil spring is arranged in the upper cylinder chamber 15A, and the urging means pushes the holding tool 17 closer to the detaching means 12. It may be.

  In the above embodiment, the cylinder device using the cylinder device having the same axis as the sizing die 5 has been described. However, although not shown, the cylinder having an axis parallel to the axis of the sizing die 5 is used. If it is a device, it may be a cylinder device arranged at a position different from the axis of the sizing die 5.

  Further, in the above embodiment, the knockout pin 18 is slidably provided in the stepped hole 22 of the piston rod 16B of the cylinder device, and the pin 23 provided at the bottom of the cylinder prevents further movement of the knockout pin 18; Although the workpiece W is knocked out from the shaft restraining means 8, although not shown, a pin provided at the bottom of the cylinder is extended long and inserted into a through hole provided in the piston rod so Alternatively, the workpiece may be knocked out from the through hole of the holder by the tip of the pin by approaching the bottom of the cylinder.

  In the present embodiment, the following effects can be achieved.

  (A) An outer race W for a constant velocity joint with a shaft integrally formed with a cup portion W1 formed with a plurality of rollers or ball rolling grooves on the inner peripheral surface and a shaft portion W2 connected thereto is formed by plastic working. As a forming method, the constant velocity joint is formed on the inner peripheral surface of the cup portion W1 of the coarse material W including the cup portion W1 with a shaft whose inner peripheral surface is roughly formed so as to approximate the shape of the inner peripheral surface of the outer race of the constant velocity joint. A sizing punch 4 having an outer peripheral surface shape carved into the inner peripheral surface shape of the outer race is fitted, and a sizing die 5 is passed through a shaft portion W2 connected to the cup portion W1 of the coarse material W through the sizing die 5. 5 is held by the shaft restraining means 8 that can move in the axial direction while maintaining the concentric state with the shaft center of the shaft 5, and in the state of being held by the shaft restraining means 8, the outside of the cup portion W1 of the coarse material W Wherein the molding finish the inner peripheral surface shape of the outer race of the constant velocity joint of the inner peripheral surface of the cup portion W1 is subjected to ironing by sizing die 5.

  Moreover, as the molding die apparatus 1 that achieves the above-described method, an outer peripheral surface shape engraved on the inner peripheral surface shape of the outer race of the constant velocity joint is provided, and approximates to the inner peripheral surface shape of the outer race of the constant velocity joint in advance. Sizing punch 4 fitted to cup part W1 of coarse material W provided with cup part W1 with a shaft whose inner peripheral surface is roughly formed, and ironing is performed on the outer periphery of cup part W1 of coarse material W. The sizing die 5 for forming the inner peripheral surface of the coarse material cup portion W1 into the outer peripheral surface shape of the sizing punch 4, and the sizing die 5 are arranged so as to be movable in the axial direction while maintaining the concentric state with the axial center of the sizing die 5. Prior to sizing the cup portion W1 of the coarse material W, the shaft portion W2 of the coarse material W is held, and when the coarse material cup portion W1 is formed by the sizing die 5, the shaft portion W2 of the coarse material W is removed from the sizing die. The axial restraining means 8 for guiding in the axial direction of 5, so that provided the.

  Therefore, the workpiece shaft runout after the sizing process is corrected with respect to the workpiece W before the sizing process, and a highly accurate outer race for a constant velocity joint can be obtained.

(A) As the shaft restraining means 8, it is slidably disposed in the mold 3 on the side provided with the sizing die 5 so as to be slidable in the direction concentric with the axis of the sizing die 5, and pushed into the mold 3 via the sizing die 5. The inside of the mold 3 is moved in the sliding direction while holding the shaft portion W2 of the coarse material W to be wound. For example, the mold 3 on the side including the sizing die 5 is arranged in parallel with the axis of the sizing die 5 By providing a fitting hole 21 that engages with the shaft portion W2 of the rough material W in the piston rod 16B of the cylinder device 15 or the holder 17 disposed at the tip of the piston rod 16B, an external pneumatic pressure source is provided. Compressed air can be used as a drive source, and can be operated without requiring a mechanism for driving the shaft restraining means 8 up and down by using the sliding movement of the press machine.

  (C) The cylinder device 15 of the shaft restraining means 8 extends the piston rod 16B prior to the sizing process to make the fitting hole 21 that engages the shaft portion W2 of the coarse material W adjacent to the sizing die 5, As the machining progresses, the piston rod 16B is retracted, and when the sizing process is completed, the piston rod 16B is retracted to the last retracted position to release the fitting between the shaft portion W2 of the coarse material W and the fitting hole 21. In the cycle, the shaft W2 is constrained only at the time of sizing, and the workpiece W after the sizing can be easily paid out by leaving the shaft W2 at other times.

  (D) The shaft restraining means 8 is provided with an engagement release pin 23 standing on the extension of the axis of the fitting hole 21 that holds the shaft portion W2 of the coarse material W, and further retracted after the sizing process is completed. By pressing the shaft portion W2 of the coarse material W with the disengagement pin 23 and detaching the shaft portion W2 of the coarse material W from the fitting hole 21, the shaft portion W2 of the workpiece W should be fitted into the restraining means 8 by any chance. Even if it bites into the joint hole 21, it can be reliably knocked out by the disengagement pin 23.

Sectional drawing of the shaping die apparatus of the outer race for constant velocity joints which shows one Embodiment of this invention. The enlarged view of the principal part of the molding die apparatus similarly shown in FIG. Sectional drawing explaining the formation process by a forging die apparatus. Sectional drawing explaining the formation process by the shaping die apparatus following FIG. Sectional drawing explaining the formation process by the shaping die apparatus following FIG. Sectional drawing explaining the formation process by the molding die apparatus following FIG. Sectional drawing explaining the formation process by the shaping die apparatus following FIG. Sectional drawing (A) and side view (B) which show an example of the outer race for constant velocity joints with a shaft which it is going to manufacture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold apparatus 2 Lower mold 3 Upper mold 4 Sizing punch 5 Sizing die 6, 10 Base plate 7 Mandrel base 8 Axis restraint means 11 Die holder 12 Release means 13 Work discharging apparatus 15 Cylinder apparatus 16B Piston rod 17 Holder 18 Knockout pin 23 pin

Claims (4)

This is a molding die device for molding an outer race for a constant velocity joint with a shaft, which is integrally provided with a cup portion formed with a plurality of rollers or ball rolling grooves on the inner peripheral surface and a shaft portion continuous therewith, by plastic working. And
A cup portion with a shaft that has an outer peripheral surface shape engraved on the inner peripheral surface shape of the outer race of the constant velocity joint and whose inner peripheral surface is roughly molded in advance to approximate the inner peripheral surface shape of the outer race of the constant velocity joint. A sizing punch for fitting the cup portion of the rough material provided,
A sizing die for forming the inner peripheral surface of the coarse material cup portion into the outer peripheral surface shape of the sizing punch by ironing the outer periphery of the rough material cup portion;
The sizing die is arranged so as to be movable in the axial direction while maintaining a concentric state with the axial center of the sizing die, and holds the coarse material shaft portion prior to the sizing of the coarse material cup portion. A shaft restraining means for guiding the shaft portion of the coarse material in the axial center direction of the sizing die at the time of molding,
Said shaft constraining means is disposed on the piston rod or the piston rod end of the cylinder apparatus arranged parallel to the axis of the sizing die into a mold side with a sizing die, fitted to engage the shaft portion of the coarse material A holding tool provided with a joint hole, and a disengagement pin erected on the mold on the extension of the axis of the fitting hole toward the holding tool,
In the position advanced by the cylinder device, the holder fits and holds the shaft portion of the coarse material in the fitting hole prior to sizing, and in the position retracted by the cylinder device, the fitting is held. A molding die device for an outer race for a constant velocity joint with a shaft , wherein a shaft portion of a coarse material held in a joint hole is pressed by the engagement release pin and separated from the fitting hole .   Prior to the sizing process, the cylinder device of the shaft restraining means extends the piston rod so that the fitting hole for engaging with the shaft portion of the rough material is adjacent to the sizing die, and the piston rod is moved backward as the sizing process proceeds. 2. The outer race for a constant velocity joint with a shaft according to claim 1, wherein when the sizing process is completed, the outer race is retracted to the last retracted position to release the fitting between the shaft portion of the coarse material and the fitting hole. Mold equipment. A molding method for molding an outer race for a constant velocity joint with a shaft integrally formed with a cup portion formed with a plurality of rollers or ball rolling grooves on an inner peripheral surface and a shaft portion continuous therewith, by plastic working,
A holding tool provided with a fitting hole which is arranged at a piston rod of a cylinder device arranged in parallel with the axis of the sizing die or a tip end of the piston rod in a mold on the side provided with the sizing die and engages the shaft portion of the coarse material. And an engagement release pin erected toward the holder on the mold on the extension of the axis of the fitting hole, and constitutes a shaft restraining means,
The inner peripheral surface of the outer race of the constant velocity joint is formed on the inner peripheral surface of the cup portion of the rough material provided with the cup portion with the shaft whose inner peripheral surface is roughly molded so as to approximate the inner peripheral surface shape of the outer race of the constant velocity joint. Fit a sizing punch with a carved outer peripheral surface shape,
A shaft portion connected to the cup portion of the coarse material, by penetrating the sizing die, movable held in the axial direction while maintaining the axis and concentric of the sizing die by the cylinder device of said shaft constraining means at its forward Hold it in the fitting hole of the tool ,
In the holding state by the fitting hole of the holder, as the sizing process proceeds, the cylinder device is contracted to retract the holder, and the outer periphery of the cup portion of the rough material is ironed by a sizing die and the Sizing the inner peripheral surface of the cup part to the inner peripheral surface shape of the outer race of the constant velocity joint,
After the sizing process is completed, the retainer is further retracted by the cylinder device, so that the disengagement pin erected on the mold on the extension of the axis of the fitting hole that holds the shaft portion of the coarse material, A method for forming an outer race for a constant velocity joint with a shaft, wherein the shaft portion of the coarse material is pressed to disengage the shaft portion of the coarse material from the fitting hole of the holder .   Prior to the sizing process, the shaft restraining means is positioned adjacent to the sizing die with a fitting hole that engages the shaft portion of the rough material, and is retracted as the sizing process proceeds. The outer race forming method for a constant velocity joint with a shaft according to claim 3, wherein the outer race is retracted to release the fitting between the shaft portion of the coarse material and the fitting hole.

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