Automobile disc spring stamping die

Abstract

The utility model discloses an automobile disc spring stamping die, which comprises a lower die holder, a lower die holder, a lower die holder, a lower die holder and an upper die holder, wherein the lower die holder is provided with a pre-pressing forming through hole, a shaping pressed blind hole and a final-pressing forming through hole which are distributed in sequence; the upper die base is provided with a pre-pressing forming punch, a shaping pressing punch and a final pressing forming punch which are sequentially distributed in the length direction of the pressing face, and the pre-pressing forming punch, the shaping pressing punch and the final pressing forming punch correspond to the pre-pressing forming through hole, the shaping pressed blind hole and the final pressing forming through hole respectively. According to the automobile disc spring stamping die, the pre-pressing forming punch, the shaping pressing punch and the outer hole forming punch on the upper die base act on a plate at the same time and are matched with a pre-pressing forming through hole, a shaping pressed blind hole and a final-pressing forming through hole, pre-punching, shaping and final punching of three parts of the plate are achieved, a disc spring is formed through three times of stamping, and the punching efficiency is improved. The stamping quality is guaranteed, impact force borne by the die during stamping is reduced, the service life of the die is prolonged, continuous stamping is facilitated, and the machining efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive disc spring manufacturing technology, and in particular to an automotive disc spring stamping die. Background Technology

[0002] Automotive disc spring stamping dies are specialized molds used to produce automotive disc springs, also known as butterfly springs. Butterfly springs are a special type of elastic element commonly used in the automotive industry for applications such as bolt preload compensation, flange connections, and vibration damping.

[0003] Disc spring stamping dies are typically formed by components such as a die base, a punch, a die, and a stripper plate. For example, Chinese utility model patents with announcement numbers CN222198632U, CN221983638U, and CN212144201U disclose a variety of disc spring stamping dies. However, all of the above disc spring stamping dies are formed in one step. During the stamping process, due to the one-step forming, the die is subjected to a large impact force, which aggravates wear and shortens the die's service life. Moreover, because of the one-step forming, the stamping shape cannot be adjusted accordingly, resulting in a decrease in stamping accuracy and thus reducing product quality. In addition, the product needs to be frequently picked up and put down on the die before and after stamping, resulting in low processing efficiency.

[0004] Therefore, it is necessary to improve the existing automotive disc spring stamping dies. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide an automotive disc spring stamping die that reduces the impact force on the die to extend its life, increases the number of stamping cycles to improve stamping accuracy and quality, and also improves processing efficiency.

[0006] To achieve the above technical effects, the technical solution of this utility model is: an automotive disc spring stamping die, comprising;

[0007] The lower mold base has a parting surface that is a long and horizontal pressure surface. The pressure surface is provided with pre-compression forming through holes, shaping pressure blind holes, and final compression forming through holes that are sequentially distributed along the length of the pressure surface. The axial directions of the pre-compression forming through holes, the shaping pressure blind holes, and the final compression forming through holes are all vertical and their inner diameters increase sequentially. The distance between the pre-compression forming through holes and the shaping pressure blind holes is a first distance, and the distance between the shaping pressure blind holes and the final compression forming through holes is a second distance. One of the first distance and the second distance is an integer multiple of the other.

[0008] An upper die base is positioned directly above the lower die base. The parting surface of the upper die base is a pressure surface parallel to and of the same length as the pressure surface. A pre-press forming punch, a shaping pressure punch, and a final pressing forming punch are arranged sequentially along the length of the pressure surface on the pressure surface. The pre-press forming punch, the shaping pressure punch, and the final pressing forming punch correspond to the pre-press forming through hole, the shaping pressure blind hole, and the final pressing forming through hole, respectively. The upper die base is used to connect a lifting device to sequentially pre-punch, shape, and final punch the sheet metal.

[0009] Preferably, in order to facilitate the collection of material punched off the sheet metal after pre-punching and final punching, the lower die base includes a horizontal pressure platform, the pre-pressing through hole, the shaping pressure blind hole and the final pressing through hole are all disposed on the pressure platform, and the lower die base also includes a collection groove located directly below the pre-pressing through hole and inclined downwards and a collection box located directly below the final pressing through hole and open at the top.

[0010] Preferably, in order to ensure that the part of the sheet metal being stamped and its surroundings are horizontal during stamping, the upper die base is also provided with positioning units. The positioning units are evenly distributed along the length direction of the pressure surface, and the distribution interval is the smaller of the first distance and the second distance. The positioning units are used to position the horizontal position of the sheet metal, and at least three positioning units correspond to the pre-pressing punch, the shaping and pressing punch and the final pressing punch, respectively.

[0011] Preferably, in order to achieve the positioning effect of the plate, each positioning unit includes a positioning pin that protrudes downward along the vertical direction from the pressure surface.

[0012] Preferably, in order to enhance the positioning of the sheet metal and ensure stamping accuracy, each positioning unit is provided with multiple positioning pins arranged in a circular array.

[0013] Preferably, in order to facilitate the positioning pin to penetrate the plate, the pressure table is also provided with receiving through holes, and the receiving through holes are respectively provided directly below the positioning pin.

[0014] Preferably, in order to ensure that the sheet metal is transported and moved in a fixed direction to ensure the stamping accuracy of the sheet metal, a guide groove extending along the length direction of the pressure surface is also included. The guide groove is fixed to the feeding side of the lower die base and the bottom of the guide groove is located on the same plane as the pressure surface.

[0015] Preferably, in order to prevent the sheet metal from moving upward and detaching from the lower die base when the upper die base moves upward after stamping, a limiting channel is also provided on the lower die base. The limiting channel is used to guide the sheet metal along the transmission direction of the pressure surface and prevent the sheet metal from detaching from the pressure surface.

[0016] Preferably, in order to form a limiting channel, the lower mold base is provided with limiting units that are directly opposite each other along the width direction of the pressure surface, and the limiting unit includes limiting grooves that are spaced apart along the length direction of the lower mold base.

[0017] Preferably, in order to facilitate the formation of the limiting groove and realize the limiting of the plate, the lower mold base is fixed with a lower limiting post, a middle limiting plate and an upper limiting plate connected in sequence from bottom to top along the coaxial center line. The top surface of the lower limiting post is located on the same plane as the pressure surface. The limiting groove is an annular groove formed by the lower limiting post, the middle limiting plate and the upper limiting plate. The length of the middle limiting plate is greater than or equal to the thickness of the plate.

[0018] In summary, compared with the prior art, the automotive disc spring stamping die of this utility model moves downwards, utilizing the pre-pressing punch, shaping punch, and external hole forming punch on the upper die base to simultaneously act on the sheet metal. This, combined with the pre-pressing forming through hole, the shaping pressure-blind hole, and the final pressing forming through hole, achieves pre-punching, shaping, and final punching of three parts of the sheet metal. The disc spring is formed through three stamping processes, ensuring stamping quality, reducing the impact force on the die during stamping, extending the die's service life, facilitating continuous stamping, and improving processing efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0021] Figure 3 This is a cross-sectional structural schematic diagram of the present invention;

[0022] Figure 4 This is another cross-sectional structural schematic diagram of this utility model;

[0023] Figure 5 This is a schematic diagram of the upper mold base of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the lower mold base of this utility model;

[0025] Figure 7 This is a schematic diagram of the connection structure between the plate and the limiting shaft of this utility model;

[0026] Figure 8 yes Figure 7 Enlarged view of part A;

[0027] In the diagram: 1. Lower die base; 11. Pressure table; 111. Pressure surface; 112. Pre-compression forming through hole; 113. Shaping pressure blind hole; 114. Final compression forming through hole; 115. Receiving through hole; 12. Collection groove; 13. Collection box; 14. Base; 15. Support plate; 16. Limiting shaft; 161. Lower limit post; 162. Middle limit plate; 163. Upper limit plate; 164. Limiting groove; 2. Upper die base; 21. Pressure surface; 22. Pre-compression forming punch; 23. Shaping pressure punch; 24. Final compression forming punch; 25. Positioning pin; 3. Guide groove; 4. Sheet metal; 41. Pre-compression hole; 42. Shaping hole; 43. Final compression hole; 44. Positioning hole. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0029] like Figures 1-8 As shown, this utility model provides an automotive disc spring stamping die, comprising:

[0030] The lower mold base 1 has a parting surface that is a long strip-shaped and horizontal pressure surface 111. The pressure surface 111 is provided with pre-pressing through holes 112, shaping pressure blind holes 113 and final pressing through holes 114 arranged sequentially along the length of the pressure surface 111. The axial directions of the pre-pressing through holes 112, shaping pressure blind holes 113 and final pressing through holes 114 are all vertical and their inner diameters increase sequentially. The distance between the pre-pressing through holes 112 and the shaping pressure blind holes 113 is the first distance, and the distance between the shaping pressure blind holes 113 and the final pressing through holes 114 is the second distance. One of the first distance and the second distance is an integer multiple of the other.

[0031] The upper mold base 2 is located directly above the lower mold base 1. The parting surface of the upper mold base 2 is a pressure surface 21 that is parallel to the pressure surface 111 and has the same length direction. The pressure surface 21 is provided with a pre-press forming punch 22, a shaping pressure punch 23, and a final pressing forming punch 24 that are distributed sequentially along the length direction of the pressure surface 21. The pre-press forming punch 22, the shaping pressure punch 23, and the final pressing forming punch 24 correspond to the pre-press forming through hole 112, the shaping pressure blind hole 113, and the final pressing forming through hole 114, respectively. The upper mold base 2 is used to connect a lifting device to perform pre-punching, shaping, and final punching on the sheet metal 4 in sequence.

[0032] When using this mold, the upper mold base 2 is moved upward, and the plate 4 is placed at the end of the lower mold base 1 near the pre-pressing through hole 112. The length direction of the plate 4 is kept consistent with the length direction of the pressure surface 111. The plate 4 is moved so that it passes between the pre-pressing through hole 112 and the pre-pressing punch 22, between the shaping pressure blind hole 113 and the shaping pressure punch 23, and between the final pressing through hole 114 and the final pressing punch 24. During the passage, the upper mold base 2 is driven to move up and down by a lifting device (not shown in the figure, the lifting device is preferably a hydraulic cylinder, used to drive the upper mold base 2 to move up and down, drive the upper mold base 2 to move down and close with the lower mold base 1, so that the pressure surface 21 of the upper mold base 2 is in contact with the top surface of the plate 4, and drive the upper mold base 2 to rise and separate from the lower mold base 1).

[0033] The pre-pressing punch 22 moves downward to apply pressure to the sheet metal 4 and enters the pre-pressing through hole 112, so that a pre-pressing hole 41 is formed on the sheet metal 4 at the corresponding positions of the pre-pressing punch 22 and the pre-pressing through hole 112. The upper die base 2 rises and separates from the lower die base 1. Then the sheet metal 4 is translated, so that the pre-pressing hole 41 moves between the forming pressure blind hole 113 and the forming pressure punch 23. The upper die base 2 descends and closes with the lower die base 1. The forming pressure punch 23 acts on the sheet metal 4 near the edge of the pre-pressing hole 41. The material at the edge is squeezed, causing the pre-pressing hole 41 and the surrounding area to deform and form the shaping hole 42. The upper mold base 2 rises and separates from the lower mold base 1. Then the plate 4 is translated, causing the shaping hole 42 to move between the final pressing forming through hole 114 and the final pressing forming punch 24. The upper mold base 2 descends and closes with the lower mold base 1. The final pressing forming punch 24 acts on the shaping hole 42 of the plate 4, causing the shaping hole 42 to form the final pressing hole 43. At the same time, the material at the original final pressing hole 43 position falls off as a whole, forming the product disc spring.

[0034] Therefore, by performing pre-punching, shaping, and punching operations sequentially at the same position on the sheet metal 4, a total of three punching operations can significantly reduce the punching force borne by the stamping die when applying pressure to the sheet metal 4, compared to sequential punching, thereby extending the service life of the die. Furthermore, during the three punching operations, it is convenient to adjust the shape of the pre-pressing hole 41, shaping hole 42, and final pressing hole 43 on the sheet metal 4 sequentially. Compared to a single punching operation, this is more conducive to ensuring the accuracy of the disc spring products stamped from the sheet metal 4 and improving the quality of the stamped products.

[0035] Furthermore, since in this utility model, one of the first distance and the second distance is an integer multiple of the other, for a long strip of plate 4, by moving the plate 4 each time by the smaller of the first distance and the second distance, the mold can simultaneously perform pre-punching, shaping and final punching on three positions of the plate 4, and can ensure that the shaping position is the original pre-punching position, and the final punching position is the original shaping position. This is beneficial for the continuous processing and production of the plate 4, thereby improving processing efficiency.

[0036] It should be noted that in this utility model, the second distance is twice the first distance, which facilitates the formation of a pre-pressing hole 41 on the plate 4 after pre-pressing a certain position on the plate 4. The plate 4 moves a distance equal to the first distance each time. When the upper mold base 2 and the lower mold base 1 close the mold again, the part of the pressure surface 21 on the upper mold base 2 located between the pre-pressing forming punch 22 and the shaping pressure punch 23 can apply pressure to the pre-pressing hole 41 position and its vicinity on the plate 4. This ensures that the above position remains flat after being subjected to the pressure of the pressure surface 21, reducing the deformation caused by pre-pressing. This is beneficial for subsequent shaping and final pressing operations, ultimately improving the stamping accuracy and product quality of the disc spring.

[0037] A further improvement is that the lower mold base 1 includes a horizontal pressure platform 11, a pre-pressing through hole 112, a shaping pressure blind hole 113 and a final pressing through hole 114 are all provided on the pressure platform 11, and the lower mold base 1 also includes a collection groove 12 located directly below the pre-pressing through hole 112 and inclined downward and a collection box 13 located directly below the final pressing through hole 114 and open at the top.

[0038] Specifically, the lower die base 1 also includes a base 14 horizontally positioned directly below the pressure table 11. The base 14 and the pressure table 11 are fixedly connected by support plates 15 arranged side-by-side and vertically along the length of the pressure surface 111. The base 14 and support plates 15 provide stable support for the pressure table 11 to withstand the impact force during stamping. The collection groove 12 under the pre-pressing through hole 112 can receive the disc-shaped material that falls from the sheet metal 4 during the first stamping operation, i.e., the pre-pressing operation, facilitating the recovery of the disc-shaped material. Similarly, the collection box 13 facilitates the collection of the ring-shaped material product that falls from the sheet metal 4 during the third stamping operation, i.e., the final pressing operation, i.e., the disc spring material formed by stamping.

[0039] A further improvement is that the upper die base 2 is also provided with positioning units. The positioning units are evenly distributed along the length direction of the pressure surface 21 and the distribution interval is the smaller of the first distance and the second distance. The positioning units are used to position the horizontal position of the plate 4, and at least three positioning units correspond to the pre-pressing punch 22, the shaping and pressing punch 23 and the final pressing punch 24 respectively.

[0040] By setting up a positioning unit, the position of the plate 4 being stamped can be fixed just before the upper mold base 2 and the lower mold base 1 are closed, that is, when the pre-pressing punch 22, the shaping and pressing punch 23 and the final pressing punch 24 act on the top surface of the plate 4, so as to ensure that the plate 4 is in a horizontal and fixed state, thereby improving the stamping accuracy and improving the quality of the final stamped product.

[0041] A further improvement is that each positioning unit includes a positioning pin 25 that protrudes downward along the vertical direction from the pressure surface 21; each positioning unit has multiple positioning pins 25 arranged in a circular array; the pressure table 11 is also provided with receiving through holes 115, which are arranged one-to-one directly below the positioning pins 25.

[0042] Specifically, in this utility model, the upper mold base 2 is provided with four positioning units that are equally spaced along the length of its own pressure surface 21. The distance between adjacent positioning units is a first distance. Each positioning unit includes four positioning pins 25. The tips of the positioning pins 25 face downward and protrude from the pressure surface 21. The line connecting the tips of the four positioning pins 25 forms a square. Two sides of the square are parallel to the length of the pressure surface 21. Correspondingly, the pressure table 11 of the lower mold base 1 is provided with sixteen receiving through holes 115. The receiving through holes 115 are directly opposite the positioning pins 25 and the inner diameter of the receiving through holes 115 is the same as the outer diameter of the positioning pins 25.

[0043] After adopting the above structure, the lifting device drives the upper mold base 2 to move downward. When the pressure surface 21 abuts against the top surface of the plate 4, at the pre-pressing through hole 112, the positioning pin 25 in the positioning unit passes through the plate 4 and enters the receiving through hole 115. The plate 4 is formed by the positioning pin 25 to form a positioning hole 44. The positioning hole 44 is positioned, thereby fixing the position and shape of the plate 4 before stamping and improving the pre-pressing accuracy of the plate 4. In other positions, since the positioning hole 44 has been formed, the positioning pin 25 can directly pass through the position of the positioning hole 44 to position the plate 4, which facilitates the shaping and final pressing of the plate 4 at the position that was previously stamped, and improves the final stamping accuracy and product quality.

[0044] A further improvement is that it also includes a guide groove 3 extending along the length of the pressure surface 111. The guide groove 3 is fixed to the feeding side of the lower die base 1, and the bottom of the guide groove 3 is located on the same plane as the pressure surface 111.

[0045] By adopting the above design, the material guide groove 3 can guide the transmission and movement direction of the sheet 4, so that the sheet 4 moves along a fixed length direction parallel to the pressure surface 111, avoiding skewing. This facilitates continuous stamping processing of the sheet 4, improving production efficiency and stamping accuracy.

[0046] A further improvement is that a limiting channel is also provided on the lower mold base 1. The limiting channel is used to guide the plate 4 along the transmission direction of the pressure surface 111 and prevent the plate 4 from leaving the pressure surface 111.

[0047] After stamping, the outer circumferential edge of the pre-pressing punch 22 is sealed and fitted with the inner circumferential wall of the pre-pressing hole 41, while the outer circumferential edge of the shaping and pressing punch 23 is sealed and fitted with the inner circumferential wall of the shaping hole 42, and the outer circumferential edge of the final pressing punch 24 is sealed and fitted with the inner circumferential wall of the final pressing hole 43. As a result, when the upper die base 2 moves upward with the output end of the lifting device, it is easy to drive the plate 4 upward, which in turn causes the plate 4 to detach from the pressure surface 111 of the lower die base 1. Therefore, by setting a limiting channel, the movement space of the plate 4 in the height direction can be effectively limited to prevent it from detaching from the lower die base 1.

[0048] A further improvement is that the lower mold base 1 is provided with a limiting unit that is directly opposite to the width direction of the pressure surface 111. The limiting unit includes limiting grooves 164 that are spaced apart along the length direction of the lower mold base 1. The lower mold base 1 is fixed with a lower limiting post 161, a middle limiting plate 162 and an upper limiting plate 163 connected in sequence from bottom to top along a coaxial center line. The top surface of the lower limiting post 161 is located on the same plane as the pressure surface 111. The limiting groove 164 is an annular groove formed by the lower limiting post 161, the middle limiting plate 162 and the upper limiting plate 163. The length of the middle limiting plate 162 is greater than or equal to the thickness of the plate 4.

[0049] Specifically, the pressure-bearing surface 111 of the pressure-bearing platform 11 is also provided with a pre-embedded hole. A limit shaft 16 is fixed in the pre-embedded hole. The limit shaft 16 includes a lower limit post 161, a middle limit plate 162, and an upper limit plate 163 connected coaxially from bottom to top. The lower limit post 161 is fixed in the pre-embedded hole, and its top is on the same plane as the pressure-bearing surface 111. The outer diameter of the middle limit plate 162 is smaller than the outer diameter of the upper limit plate 163 and the lower limit post 161. The height of the middle limit plate 162 is slightly greater than the thickness of the plate 4. The middle limit plate 162 is tangent to the plane of one of the two inner sidewalls of the guide chute 3. The tangent position is located on the same side of the two inner sidewalls. Thus, through the two opposite limit posts... The upper die holder 2 can limit the width of the sheet metal 4 on the pressure surface 111 during the transfer process, preventing it from shifting to the left or right and affecting the stamping accuracy. The limiting groove 164 is an annular groove formed by the lower limiting post 161, the middle limiting plate 162 and the upper limiting plate 163. This annular groove can limit the height of the sheet metal 4. After stamping, when the sheet metal 4 moves upward with the upper die holder 2, the top surface of the sheet metal 4 touches the bottom surface of the upper limiting plate 163, which facilitates the pre-pressing punch 22, the shaping and pressing punch 23 and the final pressing punch 24 to detach from the sheet metal 4, so that the sheet metal 4 can fall on the pressure surface 111 and continue to move, so as to realize continuous stamping of the sheet metal 4 and improve the processing and production efficiency.

[0050] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A stamping die for automotive disc springs, characterized in that, include; The lower mold base (1) has a parting surface that is a long strip-shaped and horizontal pressure surface (111). The pressure surface (111) is provided with a pre-press forming through hole (112), a shaping pressure blind hole (113) and a final pressing forming through hole (114) arranged sequentially along the length direction of the pressure surface (111). The axial direction of the pre-press forming through hole (112), the shaping pressure blind hole (113) and the final pressing forming through hole (114) are all vertical and their inner diameters increase sequentially. The distance between the pre-press forming through hole (112) and the shaping pressure blind hole (113) is a first distance, and the distance between the shaping pressure blind hole (113) and the final pressing forming through hole (114) is a second distance. One of the first distance and the second distance is an integer multiple of the other. The upper mold base (2) is located directly above the lower mold base (1). The parting surface of the upper mold base (2) is a pressure surface (21) that is parallel to the pressure surface (111) and has the same length direction. The pressure surface (21) is provided with a pre-press forming punch (22), a shaping pressure punch (23) and a final pressing forming punch (24) that are distributed sequentially along the length direction of the pressure surface (21). The pre-press forming punch (22), the shaping pressure punch (23) and the final pressing forming punch (24) correspond to the pre-press forming through hole (112), the shaping pressure blind hole (113) and the final pressing forming through hole (114) respectively. The upper mold base (2) is used to connect a lifting device to perform pre-punching, shaping and final punching on the plate (4) in sequence.

2. The automotive disc spring stamping die according to claim 1, characterized in that: The lower mold base (1) includes a horizontal pressure platform (11), the pre-press forming through hole (112), the shaping pressure blind hole (113) and the final pressing forming through hole (114) are all disposed on the pressure platform (11), and the lower mold base (1) also includes a collection groove (12) located directly below the pre-press forming through hole (112) and inclined downward and a collection box (13) located directly below the final pressing forming through hole (114) and open at the top.

3. The automotive disc spring stamping die according to claim 2, characterized in that: The upper mold base (2) is also provided with positioning units. The positioning units are evenly distributed along the length direction of the pressure surface (21) and the distribution interval is the smaller of the first distance and the second distance. The positioning units are used to position the horizontal position of the plate (4), and at least three positioning units correspond to the pre-press forming punch (22), the shaping pressure punch (23) and the final pressing forming punch (24) respectively.

4. The automotive disc spring stamping die according to claim 3, characterized in that: Each positioning unit includes a positioning pin (25) that protrudes downward along the vertical direction from the pressure surface (21).

5. The automotive disc spring stamping die according to claim 4, characterized in that: Each positioning unit has multiple positioning pins (25) arranged in a circular array.

6. The automotive disc spring stamping die according to claim 5, characterized in that: The pressure table (11) is also provided with a receiving through hole (115), which is located directly below the positioning pin (25).

7. The automotive disc spring stamping die according to claim 1, characterized in that: It also includes a guide groove (3) extending along the length of the pressure surface (111), the guide groove (3) being fixed to the feeding side of the lower mold base (1) and the bottom of the guide groove (3) being on the same plane as the pressure surface (111).

8. The automotive disc spring stamping die according to claim 7, characterized in that: The lower mold base (1) is also provided with a limiting channel, which is used to guide the plate (4) along the transmission direction of the pressure surface (111) and prevent the plate (4) from leaving the pressure surface (111).

9. The automotive disc spring stamping die according to claim 8, characterized in that: The lower mold base (1) is provided with a limiting unit that is directly opposite to the width direction of the pressure surface (111). The limiting unit includes limiting grooves (164) that are spaced apart along the length direction of the lower mold base (1).

10. The automotive disc spring stamping die according to claim 9, characterized in that: The lower mold base (1) is fixed with a lower limiting post (161), a middle limiting plate (162) and an upper limiting plate (163) connected in sequence from bottom to top along a coaxial center line. The top surface of the lower limiting post (161) is located on the same plane as the pressure surface (111). The limiting groove (164) is an annular groove formed by the lower limiting post (161), the middle limiting plate (162) and the upper limiting plate (163). The length of the middle limiting plate (162) is greater than or equal to the thickness of the plate (4).

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