Spline shaft preforming die with automatic discharge

Abstract

The utility model discloses a spline shaft preforming die with automatic discharging, including upper die holder and lower die holder, upper die holder bottom is equipped with upper female die, and lower die holder top is equipped with lower female die, and upper female die and lower female die form flat forging cavity correspondingly upside and downside, and flat forging cavity includes the head cavity of left side and the rod cavity of right side, and the coaxial line in head cavity is equipped with preforming convex die, and the axial through -hole is equipped between upper female die bottom and lower female die top right side in rod cavity, and axial through -hole diameter is less than the diameter of rod cavity, and the horizontal stripping drive of hinged right side of upper female die and lower female die is equipped on lower die holder, and the driving link of horizontal stripping drive extends into the rod cavity along axial through -hole, and the left end of driving link is equipped with the disc -shaped push -plate, and the outer circle of push -plate and the clearance fit between the inner circle of rod cavity. The utility model discloses scientific principle, simple structure, and it is easier to strip after preforming, and artificial is no longer hard, and the head of the forgings after preforming is no longer material shortage when final forging, and the yield is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of automotive drive shaft manufacturing technology, specifically relating to a spline shaft pre-forming mold with automatic material discharge. Background Technology

[0002] Splined shafts are important components of automotive driveshaft assemblies. They are typical long, rotating rod-shaped parts. The rod portion of splined shaft forgings does not participate in deformation, making them suitable for production on flat forging machines. The head of splined shaft forgings is characterized by a large upsetting ratio and difficulty in forming.

[0003] The improved forging process for spline shaft forgings was as follows: blanking → heating → pre-forging step → final forging step. After the pre-forging and final forging steps were completed, the operator used clamps to pick up and place the pre-forging and final forging parts. Taking the pre-forging step as an example, ... Figure 1 and Figure 2 As shown, the pre-forging die includes an upper die frame 1 and a lower die frame 2. The upper die frame 1 is provided with an upper die 3 at the bottom, and the lower die frame 2 is provided with a lower die 4 at the top. The upper die 3 and the lower die 4 are arranged vertically to form a flat forging cavity 5. A pre-forging punch 6 is provided on the left side of the flat forging cavity 5 along the same axis. An axial through hole 8 is provided between the bottom of the upper die 3 and the top of the lower die 4 on the right side of the flat forging cavity 5. An annular groove 10 for placing a clamping chuck 9 is provided on the inner circle of the right end of the flat forging cavity 5.

[0004] Existing pre-forging dies have the following problems in the flat forging process: 1) After pre-forging is completed, the pre-forging punch 6 moves to the left out of the flat forging cavity 5. The worker holds the right end of the clamp bar 7 and clamps the clamp head 9 to clamp the outer circle of the right end of the pre-forging part 11. It is then taken out vertically upward along the parting surface 12. Since the lower part of the pre-forging part 11 is easy to stick to the lower die 4, it is difficult for the worker to take out the pre-forging part. Sometimes it is not easy to take out the pre-forging part 11 even with great force, which affects the production efficiency.

[0005] 2) The right end face of the existing pre-forging punch 6 is a vertical plane perpendicular to the center line of the flat forging cavity 5. Thus, the left end face of the head of the pre-forged part 11 is also a vertical plane. Since the left end face of the head of the final forging part needs to be forged into a groove, the left end face of the pre-forging part 11 is a vertical plane structure. During the final forging process, the groove depth is not enough, that is, there is a lack of material outside the groove, which leads to a high scrap rate. Utility Model Content

[0006] The purpose of this invention is to provide a spline shaft preforming mold with automatic material discharge that facilitates the removal of forgings and ensures that the forging head does not lack material during final forging.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a spline shaft preforming mold with automatic material discharge, including an upper mold frame and a lower mold frame. The upper mold frame has an upper concave mold at the bottom and a lower concave mold at the top. The upper and lower concave molds correspond to each other to form a flat forging cavity. The flat forging cavity includes a head cavity on the left and a rod cavity on the right. A preforming punch is coaxially arranged in the head cavity. An axial through hole is provided on the right side of the rod cavity between the bottom of the upper concave mold and the top of the lower concave mold. The diameter of the axial through hole is smaller than the diameter of the rod cavity. A horizontal demolding actuator is hinged on the lower mold frame to the right side of the upper and lower concave molds. The driving rod of the horizontal demolding actuator extends into the rod cavity along the axial through hole. A disc-shaped push plate is provided at the left end of the driving rod. The outer circle of the push plate is clearance-fitted with the inner circle of the rod cavity.

[0008] A material gathering groove is provided at the center of the right end face of the preforming punch. The outline of the material gathering groove is a frustum shape with the left side smaller than the right side.

[0009] The head cavity is a conical cavity that is larger on the left and smaller on the right, with a cone angle of 2-6°. The inner circle of the left port of the conical cavity transitions with the outer end face in an arc.

[0010] By adopting the above technical solution, compared with the prior art, the working principle of this utility model and its technical effects are as follows: (1) The horizontal demolding drive uses a cylinder, hydraulic cylinder or electric push rod, preferably a cylinder with low cost and fast action. After the billet is placed into the lower die, the upper die holder and the upper die move down. After the upper die and the lower die are pressed together, the preforming punch squeezes the left end of the billet from left to right. The right end of the billet is limited by the push plate. The billet in the rod cavity will not be upset. The part of the billet in the head cavity is upset (radial expansion). At the same time, the material in the middle of the left end of the billet enters the material accumulation groove on the right end face of the preforming punch. After the preforming punch completes the predetermined displacement, the preforming step is completed. The preforming punch moves to the left and resets. The upper die holder and the upper die move up. At this time, the pre-forged part is stuck in the lower die. Then the horizontal demolding driver is activated. The drive rod extends to the left. The push plate at the left end of the drive rod pushes the preform to the left. After the large end of the left end of the preform is pushed out of the head cavity, the horizontal demolding driver stops. The robot's manipulator grabs the large end of the preform, takes out the preform, and places it into the final forging die for the final forging step. The horizontal demolding driver drives the drive rod to retract to the right and reset.

[0011] (2) The diameter of the axial through hole is smaller than the diameter of the rod cavity. There is an annular step at the right end of the rod cavity. The annular step limits the axial position of the push plate. The push plate blocks the axial displacement of the blank during the preforming process and also avoids the horizontal demolding driver from being subjected to axial force.

[0012] (3) The setting of the material collection groove increases the axial length of the center of the large head of the preformed forging, and ensures that the groove of the final forging has a set depth during the final forging, thereby avoiding material shortage outside the groove and improving the product qualification rate.

[0013] (4) The cone angle of the head cavity is set to 2-6°, preferably 4°. When the horizontal demolding driver applies a thrust to the pre-forging part to the left, the pre-forging part is more easily ejected. At the same time, the left port of the head cavity is larger and the port has a rounded transition, which can also provide good guidance for the pre-forming punch, making it easier for the pre-forming punch to enter the head cavity.

[0014] In summary, this utility model has a scientific principle, simple structure, and is easier to demold after preforming, eliminating the need for manual labor. The preformed forgings no longer lack material at the head during final forging, greatly improving the yield. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the existing spline shaft pre-forging die structure; Figure 2 yes Figure 1 Top view after removing the upper mold base and upper die; Figure 3 This is a schematic diagram of the structure of this utility model; Figure 4 yes Figure 3 The top view after removing the upper mold frame and upper die. Detailed Implementation

[0016] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0017] like Figures 3-4 As shown, this utility model discloses a spline shaft preforming mold with automatic material discharge, including an upper mold frame 1 and a lower mold frame 2. The upper mold frame 1 has an upper concave mold 3 at its bottom and a lower concave mold 4 at its top. The upper concave mold 3 and the lower concave mold 4 are arranged vertically to form a flat forging cavity. The flat forging cavity includes a head cavity 13 on the left and a rod cavity 14 on the right. A preforming punch 15 is coaxially arranged in the head cavity 13. An axial through hole 8 is provided on the right side of the rod cavity 14 between the bottom of the upper concave mold 3 and the top of the lower concave mold 4. The diameter of the axial through hole 8 is smaller than the diameter of the rod cavity 14. A horizontal demolding actuator is hinged on the lower mold frame 2 on the right side of the upper concave mold 3 and the lower concave mold 4. The driving rod 16 of the horizontal demolding actuator extends into the rod cavity 14 along the axial through hole 8. A disc-shaped push plate 17 is provided at the left end of the driving rod 16. The outer circle of the push plate 17 is clearance-fitted with the inner circle of the rod cavity 14.

[0018] A material gathering groove 18 is provided at the center of the right end face of the preforming punch 15. The material gathering groove 18 has a frustum shape with the left side smaller than the right side.

[0019] The head cavity 13 is a conical cavity that is larger on the left and smaller on the right. The cone angle of the conical cavity is 2-6°. The inner circle of the left port of the conical cavity is connected to the outer end face by a circular arc.

[0020] The working principle of this utility model and its technical effects are as follows: (1) The horizontal demolding drive adopts a cylinder, hydraulic cylinder or electric push rod, preferably a cylinder with low cost and fast action. After the blank is placed in the lower die 4, the upper die holder 1 and the upper die 3 move down. After the upper die 3 and the lower die 4 are pressed together, the preforming punch 15 extrudes the left end of the blank from left to right. The right end of the blank is limited by the push plate 17. The blank in the rod cavity 14 will not be upset. The part of the blank in the head cavity 13 is upset (radial expansion). At the same time, the material in the middle of the left end of the blank enters the material accumulation groove 18 on the right end face of the preforming punch 15. After the preforming punch 15 completes the predetermined displacement, the preforming step is completed. The forming punch 15 moves to the left and resets, the upper die holder 1 and the upper die 3 move upward. At this time, the pre-forged part 11 is stuck in the lower die 4. Then the horizontal demolding driver is started, the drive rod 16 extends to the left, and the push plate 17 at the left end of the drive rod 16 pushes the pre-formed part to the left. After the large end of the left end of the pre-formed part is pushed out of the head cavity 13, the horizontal demolding driver stops. The robot's manipulator grabs the large end of the pre-formed part, takes out the pre-formed part and places it in the final forging die for the final forging step. The horizontal demolding driver drives the drive rod 16 to retract to the right and reset.

[0021] (2) The diameter of the axial through hole 8 is smaller than the diameter of the rod cavity 14. There is an annular step at the right end of the rod cavity 14. The annular step limits the axial position of the push plate 17. The push plate 17 blocks the axial displacement of the blank during the preforming process and also avoids the horizontal demolding driver from being subjected to axial force.

[0022] (3) The setting of the material collection groove 18 increases the axial length of the center of the large head of the preformed forging, and ensures that the groove of the final forging has a set depth during the final forging, thereby avoiding material shortage outside the groove and improving the product qualification rate.

[0023] (4) The head cavity 13 is provided with a cone angle of 2-6°, preferably 4°. When the horizontal demolding driver applies a thrust to the pre-forging part 11 to the left, the pre-forging part 11 is more easily pushed out. At the same time, the left port of the head cavity 13 is larger and the port is rounded, which can also provide good guidance for the pre-forming punch 15, making it easier for the pre-forming punch 15 to enter the head cavity 13.

[0024] The above embodiments illustrate the basic principles and features of this utility model. However, the above descriptions are merely preferred embodiments and are not limited to these embodiments. Those skilled in the art, inspired by this patent, can make many modifications and improvements without departing from the spirit and scope of the claims, all of which fall within the protection scope of this utility model. Therefore, the patent and its scope of protection should be determined by the appended claims.

Claims

1. A pre-forming mold for a splined shaft with automatic discharge, comprising an upper mold base and a lower mold base, wherein an upper die is provided at the bottom of the upper mold base and a lower die is provided at the top of the lower mold base, the upper die and the lower die correspondingly to form a flat forging cavity, the flat forging cavity comprising a head cavity on the left and a rod cavity on the right, a pre-forming punch being coaxially provided in the head cavity, and an axial through hole being provided between the bottom of the upper die and the top of the lower die on the right side of the rod cavity, the diameter of the axial through hole being smaller than the diameter of the rod cavity, characterized in that: A horizontal ejector actuator is hinged to the right side of the upper and lower dies on the lower die frame. The drive rod of the horizontal ejector actuator extends into the rod cavity along the axial through hole. A disc-shaped push plate is provided at the left end of the drive rod, and the outer circle of the push plate is clearance-fitted with the inner circle of the rod cavity.

2. The spline shaft pre-forming mold with automatic discharge according to claim 1, characterized in that: A material gathering groove is provided at the center of the right end face of the preforming punch. The outline of the material gathering groove is a frustum shape with the left side smaller than the right side.

3. A spline shaft pre-forming mold with automatic discharge according to claim 1 or 2, characterized in that: The head cavity is a conical cavity that is larger on the left and smaller on the right, with a cone angle of 2-6°. The inner circle of the left port of the conical cavity transitions with the outer end face in an arc.

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