Forming die capable of reducing rebound deviation of stamping part

Abstract

The utility model relates to the technical field of dies, in particular to a forming die capable of reducing rebound deviation of a stamping part, which comprises a forming die core, an upper die holder, an upper die forming male, a lower die holder, a lower die forming male, a blank holder and a drawing convex ring, the drawing convex ring is correspondingly matched with the blank holder, the upper die forming male is correspondingly matched with the lower die forming male, and the lower die forming male is correspondingly matched with the lower die forming male. A concave cavity is formed in the middle of the lower die forming male in a concave mode, the forming die core is arranged in the concave cavity in a lifting mode and elastically connected with the bottom wall of the concave cavity through a first elastic piece, and the blank holder is elastically connected with the lower die base through a second elastic piece and slidably connected with the lower die base in a lifting mode. And when the first elastic piece is in the stretching state, the top surface of the forming mold core protrudes out of the upper part of the concave cavity. According to the stamping part forming method, the middle of the stamping part is subjected to press-fit forming firstly, then the edge of the stamping part is subjected to stretching forming, the rebound deviation after the stamping part is unloaded is reduced, the situation that the rebound amount is not uniform is weakened, and the overall forming precision of the stamping part is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a forming mold for reducing the rebound deviation of a stamping part. Background Art

[0002] Sheet metal stamping not only determines product cost and development cycle in the automotive industry, but also plays an important role in many other production fields. This inevitably leads to how to improve the forming accuracy of stamping parts becoming the most pressing issue to be solved in the stamping process, and the unloading rebound deviation of stamping parts is the most critical factor affecting the forming accuracy of stamping parts.

[0003] Any stamping part is composed of three-dimensional geometric units of different shapes. When the existing forming mold is used to stamp the stamping part, the size changes of different areas of the stamping part will inevitably occur, and the size changes of different areas of the stamping part will inevitably lead to different loading stress distributions in different areas of the stamping part. The difference in stress distribution in different areas of the stamping part will inevitably lead to different shrinkage and expansion amounts in different areas of the stamping part during the rebound process when the process is unloaded, which will cause the stamping part to be twisted, curled, bulged, and other undesirable problems formed during the rebound; the degree of influence of rebound on the forming accuracy of the stamping part depends not only on the geometric shape of the stamping part, but also on the characteristics of the stamping part itself. For thin-walled stamping parts with weak compression resistance, the degree of influence may be greater. How to control the rebound problem of stamping parts and reduce the rebound deviation is the most difficult process problem to solve during mold debugging and production.

[0004] Therefore, the defects are very obvious and a solution is urgently needed. Utility Model Content

[0005] In order to solve the above technical problems, the purpose of the utility model is to provide a forming die that reduces the rebound deviation of stamping parts.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A forming die for reducing the rebound deviation of stamping parts, comprising a forming die core, an upper die seat, an upper die forming male mounted on the bottom surface of the upper die seat, a lower die seat arranged below the upper die seat, a lower die forming male mounted on the lower die seat, a pressure ring arranged on the circumference of the lower die forming male and a drawing convex ring arranged on the circumference of the upper die forming male, the drawing convex ring is used to correspond with the pressure ring, the upper die forming male corresponds to the lower die forming male, a concave cavity is concavely provided in the middle of the lower die forming male, the forming die core is lifted and lowered in the concave cavity, the forming die core is elastically connected to the bottom wall of the concave cavity via a first elastic member, the pressure ring is elastically connected to the lower die seat via a second elastic member, and the pressure ring is slidably connected to the lower die seat in a lifting and lowering manner; the forming die core can be moved into the concave cavity; when the first elastic member is in an extended state, the top surface of the forming die core protrudes to the top of the concave cavity.

[0008] Furthermore, a mating block is convexly provided on the bottom surface of the upper die seat, and a mating groove is concavely provided on the top surface of the pressure ring, and the mating block and the mating groove are concavely matched.

[0009] Furthermore, the lower die seat is recessed with a slide groove, and the pressure ring is slidably arranged in the slide groove for lifting.

[0010] Furthermore, an upper killing block is arranged on the bottom surface of the upper die seat, and a lower killing block is arranged on the top surface of the lower die seat, and the upper killing block is used to abut against the lower killing block.

[0011] Furthermore, a positioning block is provided on the top surface of the blank holder ring, and a positioning groove is provided on the drawing convex ring, and the positioning block is concavely and convexly matched with the positioning groove.

[0012] Furthermore, the first elastic member and the second elastic member are both nitrogen springs.

[0013] The beneficial effects of the utility model are as follows: in practical application, the upper die seat and the lower die seat are opened, the stamping part is placed on the lower die forming male, the forming die core and the pressure ring, and then the upper die seat and the lower die seat are closed. As the upper die seat moves downward, the upper die forming male first presses the middle part of the stamping part on the forming die core and compresses the first elastic member. Under the action of the rebound force of the first elastic member, the upper die forming male cooperates with the forming die core to press and form the middle part of the stamping part, and the upper die seat continues to move downward to form the stamping part. The die core will move into the concave cavity, and the drawing convex ring will press the edge of the stamping part against the pressure ring and compress the second elastic part. Under the rebound force of the second elastic part, the drawing convex ring cooperates with the pressure ring to stretch the edge of the stamping part until the upper die forming male and the lower die forming male are in contact and fit, and the upper die seat and the lower die seat are completely closed to complete the pressing and stretching of the stamping part. After the upper die seat and the lower die seat are opened, the stamping part after forming can be taken out. The utility model first presses the middle part of the stamping part and then stretches the edge of the stamping part to control the unloading rebound stress distribution of the stamping part, reduce the rebound deviation of the stamping part after unloading, weaken the uneven rebound amount, and effectively improve the overall forming accuracy of the stamping part. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0015] Figure 2 It is a cross-sectional view of the utility model in a mold opening state.

[0016] Figure 3 It is a cross-sectional view of the utility model in a mold closing state.

[0017] Description of reference numerals:

[0018] 1. Forming mold core; 2. Upper mold base; 3. Upper mold forming male; 4. Lower mold base; 5. Lower mold forming male; 6. Blank holder; 7. Drawing convex ring; 8. Concave cavity; 9. First elastic member; 10. Second elastic member; 11. Matching block; 12. Matching groove; 13. Slide groove; 14. Upper killing block; 15. Lower killing block; 16. Positioning block; 17. Positioning groove. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0020] like Figures 1 to 3 As shown, the utility model provides a forming die for reducing the rebound deviation of stamping parts, which includes a forming die core 1, an upper die seat 2, an upper die forming male 3 installed on the bottom surface of the upper die seat 2, a lower die seat 4 arranged below the upper die seat 2, a lower die forming male 5 installed on the lower die seat 4, a blank holder 6 arranged on the circumference of the lower die forming male 5 and a drawing convex ring 7 arranged on the circumference of the upper die forming male 3, the drawing convex ring 7 is used to correspond to the blank holder 6, the upper die forming male 3 and the lower die The molding male 5 is matched correspondingly, and a concave cavity 8 is recessed in the middle of the lower mold molding male 5. The molding core 1 is arranged in the concave cavity 8 for lifting and lowering. The molding core 1 is elastically connected to the bottom wall of the concave cavity 8 via the first elastic member 9, and the pressure ring 6 is elastically connected to the lower mold base 4 via the second elastic member 10. The pressure ring 6 is slidably connected to the lower mold base 4 for lifting and lowering; the molding core 1 can be moved into the concave cavity 8; when the first elastic member 9 is in an extended state, the top surface of the molding core 1 protrudes to the outside of the upper part of the concave cavity 8.

[0021] In practical applications, the upper die seat 2 and the lower die seat 4 are opened, and the stamping part is placed on the lower die forming male 5, the forming core 1 and the pressure ring 6. Then the upper die seat 2 and the lower die seat 4 are closed. As the upper die seat 2 moves downward, the upper die forming male 3 first presses the middle part of the stamping part on the forming core 1 and compresses the first elastic member 9. Under the action of the rebound force of the first elastic member 9, the upper die forming male 3 cooperates with the forming core 1 to press and form the middle part of the stamping part. The upper die seat 2 continues to move downward, and the forming core 1 will move downward. Move into the concave cavity 8, and the drawing convex ring 7 will press the edge of the stamping part against the pressure ring 6 and compress the second elastic member 10. Under the action of the rebound force of the second elastic member 10, the drawing convex ring 7 cooperates with the pressure ring 6 to stretch the edge of the stamping part until the upper die forming male 3 and the lower die forming male 5 are in contact with each other, and the upper die seat 2 and the lower die seat 4 are completely closed to complete the pressing and stretching of the stamping part. After the upper die seat 2 and the lower die seat 4 are opened, the stamping part after forming can be taken out. The utility model first presses the middle part of the stamping part, and then appropriately stretches the edge of the stamping part to control the unloading rebound stress distribution of the stamping part, reduce the rebound deviation of the stamping part after unloading, weaken the uneven rebound amount, and effectively improve the overall forming accuracy of the stamping part.

[0022] In this embodiment, the bottom surface of the upper die base 2 is provided with a mating block 11, and the top surface of the blank holder 6 is provided with a mating groove 12, and the mating block 11 is concavely matched with the mating groove 12. When the upper die base 2 and the lower die base 4 are molded together, the mating block 11 will be inserted into the mating groove 12 to improve the precision and stability of the molds of the upper die base 2 and the lower die base 4, and when the mating block 11 and the mating groove 12 are pressed, the blank holder 6 will move downward and compress the second elastic member 10, and the resilience of the second elastic member 10 makes the drawing convex ring 7 cooperate with the blank holder 6 to stretch the edge of the stamping part.

[0023] In this embodiment, the lower die base 4 is recessed with a slide groove 13, and the blank holder 6 is slidably arranged in the slide groove 13. When the blank holder 6 moves relative to the lower die base 4, the blank holder 6 slides along the slide groove 13, thereby improving the movement stability of the blank holder 6.

[0024] In this embodiment, an upper killing block 14 is provided on the bottom surface of the upper die base 2, and a lower killing block 15 is provided on the top surface of the lower die base 4, and the upper killing block 14 is used to abut against the lower killing block 15. When the upper killing block 14 abuts against the lower killing block 15, it proves that the upper die base 2 and the lower die base 4 are in place.

[0025] In this embodiment, the top surface of the blank holder 6 is provided with a positioning block 16, and the drawing convex ring 7 is provided with a positioning groove 17, and the positioning block 16 is concavely matched with the positioning groove 17. When the blank holder 6 and the drawing convex ring 7 are matched, the positioning block 16 is inserted into the positioning groove 17 to improve the accuracy and stability of the blank holder 6 and the drawing convex ring 7 in stretching the edge of the stamping part.

[0026] In this embodiment, the first elastic member 9 and the second elastic member 10 are both nitrogen springs.

[0027] All technical features in this embodiment can be freely combined according to actual needs.

[0028] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A forming die for reducing the rebound deviation of stamping parts, characterized in that: The present invention comprises a forming mold core (1), an upper mold base (2), an upper mold forming male (3) mounted on the bottom surface of the upper mold base (2), a lower mold base (4) arranged below the upper mold base (2), a lower mold forming male (5) mounted on the lower mold base (4), a pressure ring (6) arranged on the peripheral side of the lower mold forming male (5), and a drawing convex ring (7) arranged on the peripheral side of the upper mold forming male (3), wherein the drawing convex ring (7) is used to correspond with the pressure ring (6), the upper mold forming male (3) corresponds to the lower mold forming male (5), and the lower mold forming male (5) is used to correspond to the pressure ring (6). ) is provided with a concave cavity (8) in the middle part, the forming mold core (1) is arranged in the concave cavity (8) in a lifting manner, the forming mold core (1) is elastically connected to the bottom wall of the concave cavity (8) via a first elastic member (9), the pressure ring (6) is elastically connected to the lower mold base (4) via a second elastic member (10), and the pressure ring (6) is slidably connected to the lower mold base (4) in a lifting manner; the forming mold core (1) can be moved into the concave cavity (8); when the first elastic member (9) is in an extended state, the top surface of the forming mold core (1) protrudes to the top of the concave cavity (8).

2. A forming die for reducing the rebound deviation of stamping parts according to claim 1, characterized in that: The bottom surface of the upper die seat (2) is convexly provided with a mating block (11), and the top surface of the pressure ring (6) is concavely provided with a mating groove (12), and the mating block (11) and the mating groove (12) are concave-convexly matched.

3. A forming die for reducing rebound deviation of stamping parts according to claim 1, characterized in that: The lower die base (4) is recessed with a slide groove (13), and the blank holder (6) is slidably arranged in the slide groove (13) in a lifting manner.

4. A forming die for reducing the rebound deviation of stamping parts according to claim 1, characterized in that: The bottom surface of the upper die seat (2) is provided with an upper killing block (14), and the top surface of the lower die seat (4) is provided with a lower killing block (15), and the upper killing block (14) is used to abut against the lower killing block (15).

5. A forming die for reducing rebound deviation of stamping parts according to claim 1, characterized in that: The top surface of the blank holder ring (6) is provided with a positioning block (16), the drawing convex ring (7) is provided with a positioning groove (17), and the positioning block (16) and the positioning groove (17) are concave-convexly matched.

6. A forming die for reducing the rebound deviation of stamping parts according to claim 1, characterized in that: The first elastic member (9) and the second elastic member (10) are both nitrogen springs.

Images