A cross wedge rolling die for a shift lever

Abstract

The present invention discloses a cross wedge rolling die for a shift lever, which relates to the technical field of cross wedge rolling. It includes a spherical part forming wedge part, a balance wedge part, a rod part forming wedge part, and a finishing cavity. The spherical part forming wedge part roll-forges and forms the spherical part of the shift lever. The front end of the spherical part forming wedge part is the first wedge entry section, and the end of the spherical part forming wedge part is the first unloading section. The balance wedge part is successively provided with a second wedge entry section, a first broadening section, and a first finishing section from front to back. The balance wedge part roll-forges and forms a part of the long rod of the shift lever. The rolling force of the balance wedge part and the rolling force of the spherical part forming wedge part are balanced with each other during the rolling process; the rod part forming wedge part roll-forges and forms the remaining part of the long rod of the shift lever; the finishing cavity finishes the spherical part of the shift lever, and the finishing cavity is successively provided with a transition section, a third finishing section, and a second unloading section from front to back. The present invention improves the material utilization rate, improves the production efficiency, and improves the internal tissue performance of the part, and the service performance of the part is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cross wedge rolling, and particularly to a cross wedge rolling die for a shift lever. Background Art

[0002] Cross wedge rolling is a new process for forming shaft parts, which has advantages such as high efficiency and material saving. It has two rollers with wedge-shaped dies, the two rollers rotate in the same direction, driving the rolled piece to rotate in the opposite direction, and forming a rotary part through radial compression and axial extension. This process has been widely applied at home and abroad. Cross wedge rolling mainly focuses on rotary stepped shafts, and is widely used in heavy truck and car gearboxes, and less involved in other fields. Especially for shift lever shaft parts, these parts are small, thin and long, and there is a spherical shape at one end. It is difficult to form them by cross wedge rolling, asymmetric rolling needs to be adopted, and problems such as non-conforming dimensions and bending are likely to occur. These parts were previously forged or machined by turning. Forging is local upset forging, which has high requirements for the equipment stroke and only has poor forged streamline performance in part; directly turning with a round steel section not only consumes a large amount of materials and has high costs, but also has a large amount of subsequent turning, low processing efficiency, and turning will directly damage the metal streamline, causing the metal streamline to break and resulting in poor performance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a cross wedge rolling die for a shift lever, which directly produces the shift lever by the cross wedge rolling process, improves the material utilization rate, reduces the machining allowance, improves the production efficiency, and improves the internal tissue performance of the part. The subsequent processed metal streamline is continuous, and the service performance of the part is improved.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A cross wedge rolling die for a shift lever, including a spherical part forming wedge part, a balance wedge part, a rod part forming wedge part, and a finishing cavity. The spherical part forming wedge part roll-forges and forms the spherical part of the shift lever. The front end of the spherical part forming wedge part is the first wedging section, and the end of the spherical part forming wedge part is the first unloading section. The balance wedge part is successively provided with a second wedging section, a first broadening section, and a first finishing section from front to back. The balance wedge part roll-forges and forms a part of the long rod of the shift lever. The front end of the first wedging section is aligned with the front end of the second wedging section, and the end of the first unloading section is aligned with the end of the first finishing section. The rolling force of the balance wedge part and the rolling force of the spherical part forming wedge part balance each other during the rolling process. The rod part forming wedge part roll-forges and forms the remaining part of the long rod of the shift lever. The rod part forming wedge part is successively provided with a third wedging section, a second broadening section, and a second finishing section from front to back. The front end of the third wedging section is located between the first unloading section and the first finishing section. The finishing cavity finishes the spherical part of the shift lever. The finishing cavity is successively provided with a transition section, a third finishing section, and a second unloading section from front to back. The front end of the transition section is aligned with the middle and rear part of the second broadening part, and the rear end of the second unloading section is aligned with the rear end of the second finishing part.

[0005] Preferably, the spherical part forming wedge part is further successively provided with a forming section and a finishing section from front to back. The forming section and the finishing section are located between the first wedging section and the first unloading section. The forming angle α of the spherical part forming wedge part is 35° - 45°, the broadening angle β is 8° - 12°, and the length of the finishing section is 2 to 3 times the diameter of the spherical part of the shift lever.

[0006] Preferably, the first unloading section makes an external draft angle with the die in contact with the spherical surface along the rolling direction of the spherical part of the shift lever. The angle of the external draft angle is 1° - 3°, and the length of the first unloading section is 1.5 to 2 times the diameter of the spherical part of the shift lever.

[0007] Preferably, the length of the third finishing section is 2 to 3 times the diameter of the spherical part of the shift lever. The second unloading section makes an external draft angle with the die in contact with the spherical surface along the rolling direction of the spherical part of the shift lever. The angle of the external draft angle is 1° - 3°, and the length of the second unloading section is 1.5 to 2 times the diameter of the spherical part of the shift lever.

[0008] Preferably, the width of the balance wedge part is determined according to the axial dimension of the spherical part of the shift lever. The forming angle α of the balance wedge part is 35° - 45°, and a 45° external bevel angle is provided opposite to the forming angle. The broadening angle β of the balance wedge part is 8° - 12°.

[0009] Preferably, the rod - forming wedge part performs wedge rolling at the center of the long rod of the shift lever, and the starting end of the third wedge - entering section is located 5 mm - 10 mm before the end of the first unloading section.

[0010] The beneficial effects of adopting the above - mentioned technical solution are as follows:

[0011] 1. When using the cross - wedge rolling process to produce the shift lever, firstly, the processing amount is reduced, the material utilization rate and machining efficiency are improved, the material consumption and energy consumption are reduced, which is environmentally friendly; secondly, the shift lever produced by cross - wedge rolling is a continuous volume forming, and the metal streamline is continuous, improving the tissue performance, which can extend the service life of the shift lever and improve the user experience of customers.

[0012] 2. Design the ball - forming wedge part and the balance wedge part at the front end of the die. By simultaneously forming the two parts, a symmetric force rolling is combined to avoid the creeping caused by the unbalanced left - right axial force, and further solve the problems of size non - conformity and bending caused by left - right creeping; when forming the ball part, the diameter of the steel is reserved at the middle position as a support to further stabilize the rolling state. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the unfolded structural schematic diagram of the present invention;

[0014] Figure 2 is the unfolded structural schematic diagram of the ball - forming wedge part;

[0015] Figure 3 is the unfolded structural schematic diagram of the balance wedge part;

[0016] Figure 4 is the unfolded structural schematic diagram of the finishing cavity;

[0017] In the figure: 1. Ball - forming wedge part; 11. First unloading section; 12. First wedge - entering section; 2. Balance wedge part; 21. Second wedge - entering section; 22. First broadening section; 23. First finishing section; 3. Rod - forming wedge part; 31. Third wedge - entering section; 32. Second broadening section; 33. Second finishing section; 4. Finishing cavity; 41. Transition section; 42. Third finishing section; 43. Second unloading section. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0019] Such as Figure 1As shown in the figure, a cross wedge rolling die for a shift lever includes a spherical part forming wedge 1, a balance wedge 2, a rod part forming wedge 3, and a finishing cavity 4. The spherical part forming wedge 1 roll-forges the spherical part of the shift lever. The spherical part forming wedge 1 is successively provided with a first wedge-in section 12, a forming section, a finishing section, and a first unloading section 11 from front to back. The first unloading section 11 makes an external draft angle for the die in contact with the spherical surface along the rolling direction of the spherical part of the shift lever, and the angle of the external draft angle is 1°-3°. The length of the first unloading section 11 is 1.5-2 times the diameter of the spherical part of the shift lever. The forming angle α of the spherical part forming wedge 1 is 35°-45°, the spreading angle β is 8°-12°, and the length of the finishing section is 2-3 times the diameter of the spherical part of the shift lever.

[0020] The balance wedge 2 is successively provided with a second wedge-in section 21, a first spreading section 22, and a first finishing section 23 from front to back. The balance wedge 2 roll-forges a part of the long rod of the shift lever. The front end of the first wedge-in section 12 is aligned with the front end of the second wedge-in section 21, and the end of the first unloading section 11 is aligned with the end of the first finishing section 23. The rolling force of the balance wedge 2 and the rolling force of the spherical part forming wedge 1 are balanced with each other during the rolling process; the width of the balance wedge 2 is determined according to the axial dimension of the spherical part of the shift lever. The forming angle α of the balance wedge 2 is 35°-45°, and a 45° external bevel angle is provided opposite to the forming angle. The spreading angle β of the balance wedge 2 is 8°-12°

[0021] The rod part forming wedge 3 roll-forges the remaining part of the long rod of the shift lever. The rod part forming wedge 3 is successively provided with a third wedge-in section 31, a second spreading section 32, and a second finishing section 33 from front to back. The front end of the third wedge-in section 31 is located between the first unloading section 11 and the first finishing section 23. The rod part forming wedge 3 starts wedging and rolling at the center of the long rod of the shift lever, and the starting end of the third wedge-in section 31 is located at a position 5 mm-10 mm before the end of the first unloading section 11.

[0022] The finishing cavity 4 finishes the spherical part of the shift lever. The finishing cavity 4 is successively provided with a transition section 41, a third finishing section 42, and a second unloading section 43 from front to back. The front end of the transition section 41 is aligned with the middle and rear part of the second spreading part 3, and the rear end of the second unloading section 43 is aligned with the rear end of the second finishing part 33. The length of the third finishing section 42 is 2-3 times the diameter of the spherical part of the shift lever. The second unloading section 43 makes an external draft angle for the die in contact with the spherical surface along the rolling direction of the spherical part of the shift lever, and the angle of the external draft angle is 1°-3°. The length of the second unloading section 43 is 1.5-2 times the diameter of the spherical part of the shift lever.

[0023] There is a certain pressure on the spherical part of the shift lever during both finishing sections. When the shift lever finishes finishing and leaves the die, the axis lines of the two rollers will suddenly move closer due to the sudden disappearance of the pressure, leaving axial indentations on the surface of the rolled piece. Therefore, an unloading section needs to be designed at the last part of the finishing section. A conventional unloading section requires the pressure to decrease slowly until it disappears, so only a simple angle is needed. For example, for a straight-step shaft, only a bevel with a certain angle needs to be made on the top surface of the step. However, for a spherical part, pressure exists on the entire spherical surface, so an unloading section needs to be designed for the entire spherical position of the rolled piece.

[0024] The blank of the shift lever starts rolling from the first wedging section 12 and the second wedging section 21. After passing through the spherical forming wedge section 1 and the balancing wedge section 2, the rolling of the spherical part and half of the long rod is completed, and the wedging rolling of the other part of the long rod starts. After passing through the rod forming wedge section 3, the rolling of the entire rod is completed. When the rolled piece enters the middle and rear part of the rod forming wedge section 3, the head enters the finishing cavity 4 to start finishing. Finally, the rod and the head are rolled simultaneously, and the rolling of the entire rolled piece is completed.

[0025] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A cross wedge rolling die for a shift lever, characterized in that It includes a spherical part forming wedge (1), a balance wedge (2), a rod part forming wedge (3), and a finishing cavity (4). The spherical part forming wedge (1) roll-forms the spherical part of the shift lever. The front end of the spherical part forming wedge (1) is the first wedging section (12), and the end of the spherical part forming wedge (1) is the first unloading section (11). The balance wedge (2) is successively provided with a second wedging section (21), a first broadening section (22), and a first finishing section (23) from front to back. The balance wedge (2) roll-forms a part of the long rod of the shift lever. The front end of the first wedging section (12) is aligned with the front end of the second wedging section (21), and the end of the first unloading section (11) is aligned with the end of the first finishing section (23). The rolling force of the balance wedge (2) and the rolling force of the spherical part forming wedge (1) balance each other during the rolling process. The rod part forming wedge (3) roll-forms the remaining part of the long rod of the shift lever. The rod part forming wedge (3) is successively provided with a third wedging section (31), a second broadening section (32), and a second finishing section (33) from front to back. The front end of the third wedging section (31) is located between the first unloading section (11) and the first finishing section (23). The finishing cavity (4) finishes the spherical part of the shift lever. The finishing cavity (4) is successively provided with a transition section (41), a third finishing section (42), and a second unloading section (43) from front to back. The front end of the transition section (41) is aligned with the middle and rear part of the second broadening section (32), and the rear end of the second unloading section (43) is aligned with the rear end of the second finishing section (33). The spherical part forming wedge (1) is also successively provided with a forming section and a finishing section from front to back, and the forming section and the finishing section are located between the first wedging section (12) and the first unloading section (11). The rod part forming wedge (3) starts wedging and rolling at the center of the long rod of the shift lever, and the starting end of the third wedging section (31) is located 5 mm - 10 mm before the end of the first unloading section (11).

2. The cross wedge rolling die for a shift lever according to claim 1, wherein The forming angle α of the spherical part forming wedge (1) is 35° - 45°, the broadening angle β is 8° - 12°, and the length of the finishing section is 2 - 3 times the diameter of the spherical part of the shift lever.

3. A cross wedge rolling die for a shift lever according to any one of claims 1-2, characterized in that, The first unloading section (11) makes an external draft angle with the mold in contact with the spherical surface along the rolling direction of the spherical part of the shift lever, and the angle of the external draft angle is 1° - 3°. The length of the first unloading section (11) is 1.5 - 2 times the diameter of the spherical part of the shift lever.

4. A cross wedge rolling die for a shift lever according to claim 3, characterized in that, The length of the third finishing section (42) is 2 - 3 times the diameter of the spherical part of the shift lever. The second unloading section (43) makes an external draft angle with the mold in contact with the spherical surface along the rolling direction of the spherical part of the shift lever, and the angle of the external draft angle is 1° - 3°. The length of the second unloading section (43) is 1.5 - 2 times the diameter of the spherical part of the shift lever.

5. A cross wedge rolling die for a shift lever according to claim 1, characterized in that, The width of the balance wedge portion (2) is determined according to the axial dimension of the spherical portion of the shift lever. The forming angle α of the balance wedge portion (2) is 35°-45°, and a 45° external oblique angle is provided opposite to the forming angle. The widening angle β of the balance wedge portion (2) is 8°-12°.

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