Punching and trimming die for cross shaft forge piece

Abstract

The utility model relates to the technical field of cross shaft forging, in particular to a punching and trimming die for a cross shaft forge piece. Comprising an upper die and a lower die, a cavity for containing a cross shaft is formed in the middle of the lower die, a trimming punch matched with the cavity of the lower die is arranged on the lower portion of the upper die, a connecting base is arranged on the upper portion of the upper die, and a punching punch is arranged in the center of the bottom of the trimming punch. A cross shaft forge piece is placed on a cavity of a lower die, a flash of the cross shaft forge piece is attached to the top face of the lower die, an upper die moves downwards, a punching punch firstly punches a connecting skin in a shaft hole in the middle of the cross shaft forge piece open, then a trimming punch presses a cross shaft into the lower die, and the flash is separated from a cross shaft body. The effects of trimming and punching are synchronously achieved, the working procedure is simplified, the labor intensity of workers is reduced, and the forging speed is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of cross shaft forging, in particular to a punching and trimming die for cross shaft forgings. Background Art

[0002] The cross shaft is a mechanical part for realizing variable-angle power transmission and is used in positions where the direction of the transmission axis needs to be changed. It is the "joint" part of the universal transmission device of the vehicle drive system. The cross shaft type rigid universal joint is a widely used non-constant velocity universal joint in vehicles, allowing a maximum included angle of 15° to 20° between adjacent two shafts. The cross shaft is one of the key parts of the cross shaft type rigid universal joint. The forming of the cross shaft includes upsetting, clamping, pre-forging and final precision forging. After precision forging, there is a layer of web in the middle of the shaft hole of the cross shaft forging, and there is flash on the outer periphery of the cross shaft product. The processes of punching the shaft hole and cutting the flash need to be carried out to obtain the cross shaft product, and the processes are relatively cumbersome, the labor intensity of workers is high, and the forging speed is slow. Content of the Utility Model

[0003] The utility model aims to solve the above problems, thereby providing a punching and trimming die for cross shaft forgings with simplified processes.

[0004] The technical solution adopted by the utility model to solve the above problems is as follows:

[0005] A punching and trimming die for cross shaft forgings includes an upper die and a lower die. A cavity for placing the cross shaft is provided in the middle of the lower die. The lower part of the upper die is a trimming punch adapted to the cavity of the lower die, the upper part of the upper die is a connecting seat, and a punching punch is arranged at the central position of the bottom of the trimming punch.

[0006] The utility model adopting the above technical solution, compared with the prior art, has the prominent feature that:

[0007] Place the cross shaft forging on the cavity of the lower die, the flash of the cross shaft forging is attached to the top surface of the lower die, the upper die descends, the punching punch first punches the web in the shaft hole in the middle of the cross shaft forging, and then the trimming punch presses the cross shaft into the lower die, and the flash is separated from the cross shaft body, synchronously realizing the effects of flash cutting and punching, simplifying the processes, reducing the labor intensity of workers, and accelerating the forging speed.

[0008] As a preference, a further technical solution of the utility model is as follows:

[0009] Further, the connecting seat is cylindrical, through holes are relatively arranged in the middle of the trimming punch and the connecting seat, a part of the rod body of the punching punch is located in the through hole, a plurality of threaded holes communicating with the through hole are circumferentially arranged on the side wall of the connecting seat, a locking screw is screwed in the threaded hole, and the inner end of the locking screw abuts against the rod body of the punching punch.

[0010] Furthermore, several automatic edge - dropping mechanisms penetrate longitudinally along the outer periphery of the through - hole on the connecting seat, and the bottom ends of the automatic edge - dropping mechanisms are opposite to the top surface of the outer periphery of the lower die cavity.

[0011] Furthermore, the automatic edge - dropping mechanism includes a return spring. Along the outer periphery of the through - hole on the connecting seat, several return holes are longitudinally opened. The return spring is located in the return hole and its top end is fixed to the inner wall of the return hole. The bottom end of the return spring is connected with a return rod that is slidably connected to the return hole, and the bottom end of the return rod is opposite to the top surface of the outer periphery of the lower die cavity. Description of the Drawings

[0012] Figure 1 is the front - view structural schematic diagram of the embodiment of the present utility model;

[0013] Figure 2 is the structural schematic diagram of the cross - shaft forging of the embodiment of the present utility model;

[0014] In the figure, the markings are: upper die 1, connecting seat 11, trimming punch 12, through - hole 13, lower die 2, cavity 21, punching punch 3, locking screw 4, return spring 5, return rod 6, cross - shaft forging 7. Detailed Embodiment

[0015] The following further illustrates the present utility model with reference to the embodiments. The purpose is only to better understand the content of the present utility model. Therefore, the examples given do not limit the protection scope of the present utility model.

[0016] A punching and trimming die for a cross - shaft forging includes an upper die 1 and a lower die 2. A cavity 21 for placing the cross - shaft is opened in the middle of the lower die 2. The flash of the cross - shaft forging 7 adheres to the top surface of the lower die 1. The lower part of the upper die 1 is a trimming punch 12 adapted to the cavity 21 of the lower die 1. The trimming punch 12 is cross - shaped when viewed from above and matches the cross - shaft product. The upper part of the upper die 1 is a connecting seat 11, and a punching punch 3 is arranged at the center position of the bottom of the trimming punch 12.

[0017] Furthermore, the connecting seat 11 is cylindrical. Through - holes 13 are oppositely opened in the middle of the trimming punch 12 and the connecting seat 11. A part of the rod body of the punching punch 12 is located in the through - hole 13. A plurality of threaded holes communicating with the through - hole 13 are circumferentially opened on the side wall of the connecting seat 11. At least two rows of threaded holes are opened from top to bottom. Locking screws 4 are screwed in the threaded holes. The inner end of the locking screw 4 abuts against the rod body of the punching punch 3. The punching punch 3 is fixed by the locking screws 4, and the coaxiality of the punching punch 3 and the cross - shaft hole is adjusted by a plurality of locking screws 4.

[0018] Furthermore, a plurality of automatic edge-dropping mechanisms are provided on the connecting seat 11 and are located on the periphery of the through hole 13 and penetrate the connecting seat 11 longitudinally. The bottom end of the automatic edge-dropping mechanism is opposite to the top surface of the periphery of the cavity 21 of the lower mold 2. After the flash is cut off by the traditional method, the flash will be stuck on the periphery of the trimming punch 12 and needs to be knocked off manually, which increases the labor intensity of the workers. With the automatic edge-dropping mechanism, the flash will be automatically ejected from the trimming punch 12 after it is cut off.

[0019] Furthermore, the automatic edge dropping mechanism includes a reset spring 5, a plurality of reset holes are longitudinally opened on the connecting seat 11 and located on the periphery of the through hole 13, the reset spring 5 is located in the reset hole and the top end is fixed to the inner wall of the reset hole, the bottom end of the reset spring 5 is connected to a reset rod 6 slidably connected to the reset hole, the bottom end of the reset rod 6 is opposite to the top surface of the periphery of the cavity 21 of the lower mold 2, the upper mold 1 moves downward to drive the reset rod 6 downward, the reset rod 6 is against the top of the flash of the cross shaft forging 7, at this time the reset spring 5 is in a compressed state, when the trimming punch 12 cuts off the flash, the flash is stuck on the periphery of the trimming punch 12, the upper mold 1 moves upward, the reset spring 5 drives the reset rod 6 to pop out and drives the flash to separate from the trimming punch 12.

[0020] Place the cross-axis forging on the cavity of the lower die, with the flash of the cross-axis forging fitted on the top surface of the lower die. The upper die moves downward, and the punching punch first punches open the skin in the shaft hole in the middle of the cross-axis forging. Then the trimming punch presses the cross-axis into the lower die, and the flash is separated from the cross-axis body, achieving the effects of flash cutting and punching simultaneously, simplifying the process, reducing the labor intensity of workers, and speeding up the forging speed.

[0021] The above description is only a preferred feasible embodiment of the present utility model, and does not limit the scope of rights of the present utility model. All equivalent changes made using the contents of the present utility model specification and its drawings are included in the scope of rights of the present utility model.

Claims

1. A punching and trimming die for a cross shaft forging, comprising an upper die and a lower die, characterized in that: A cavity for placing a cross shaft is provided in the middle of the lower die. The lower part of the upper die is a trimming punch adapted to the cavity of the lower die, and the upper part of the upper die is a connecting seat. A punching punch is arranged at the center of the bottom of the trimming punch.

2. The punching and trimming die for the cross shaft forging according to claim 1, wherein: The connecting seat is cylindrical. Through holes are relatively provided in the middle of the trimming punch and the connecting seat. A part of the rod body of the punching punch is located in the through hole. A plurality of threaded holes communicating with the through hole are circumferentially provided on the side wall of the connecting seat. A locking screw is screwed in the threaded hole, and the inner end of the locking screw abuts against the rod body of the punching punch.

3. The punching and trimming die for the cross shaft forging according to claim 1, wherein: A plurality of automatic edge dropping mechanisms are longitudinally penetrated on the connecting seat and located on the outer periphery of the through hole. The bottom end of the automatic edge dropping mechanism faces the top surface of the outer periphery of the cavity of the lower die.

4. The punching and trimming die for the cross shaft forging according to claim 1, wherein: The automatic edge dropping mechanism includes a return spring. A plurality of return holes are longitudinally provided on the connecting seat and located on the outer periphery of the through hole. The return spring is located in the return hole and its top end is fixed to the inner wall of the return hole. The bottom end of the return spring is connected with a return rod slidably connected to the return hole. The bottom end of the return rod faces the top surface of the outer periphery of the cavity of the lower die.

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