Stamping drawing die with constant locking force

Abstract

The invention relates to the technical field of stamping and drawing dies, in particular to a stamping and drawing die with constant locking force, which comprises a lower die holder, a male die, a blank holder, a lower elastic component, an upper die holder, a female die, an upper elastic component and two rotary locking mechanisms symmetrically arranged on two sides of the blank holder and the female die. The bottom face of the female die is used for abutting against the top face of the blank holder. When the upper die base and the lower die base are closed, the rotary locking mechanism applies pressure to the upper elastic assembly and the lower elastic assembly and locks the blank holder and the female die so as to apply constant locking force to the blank holder and the female die. The edge of the female die and the blank holder are locked through the rotary locking mechanism, and the locking force is constant, so that the pressing force of the edge of the female die and the edge of the workpiece pressed by the blank holder is constant, and the springback jacking force of the upper elastic assembly and the lower elastic assembly is counteracted, so that the stamping and drawing forming stability of the workpiece is improved, and the stamping and drawing forming efficiency is improved. And the problem of tension cracks or wrinkles is avoided, and the stamping and drawing forming quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of stamping and drawing dies, and in particular to a stamping and drawing die with a constant locking force. Background Art

[0002] Currently, in the stamping and drawing forming process of automotive panels, as the punch press drives the upper die holder to drive the female die downward, the bottom surface of the female die presses the edge of the workpiece against the blank holder. The nitrogen spring provides elastic force to the blank holder so that the female die and the blank holder can press the edge of the workpiece. However, as the female die, the workpiece, and the blank holder gradually move downward, with the increase in the compression amount of the nitrogen spring, the elastic force exerted by the nitrogen spring on the blank holder will gradually increase, resulting in a gradual increase in the pressing force for pressing the workpiece, and thus the pressing force for pressing the workpiece is unstable. When the pressing force is too large, the workpiece is prone to fracture or tearing during the stamping and drawing forming process. When the pressing force is too small, the workpiece is prone to wrinkling or creasing during the stamping and drawing forming process, making it difficult to ensure the quality of the workpiece during stamping and drawing forming. Moreover, the upward elastic force of the nitrogen spring will form an outward counterforce, which will ultimately act on the punch press to form a resistance against the punch press, impacting the punch press, and thus increasing the performance requirements for the punch press. Therefore, the defects are very obvious, and a solution is urgently needed. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a stamping and drawing die with a constant locking force.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A stamping and drawing die with a constant locking force, which includes a lower die holder, a punch disposed on the upper side of the lower die holder, a blank holder sleeved on the outer sidewall of the punch in a lifting manner, a lower elastic component disposed obliquely on the lower side of the blank holder, an upper die holder disposed above the lower die holder in a lifting manner, a female die disposed on the lower side of the upper die holder and adapted to be concave-convex with the punch, an upper elastic component disposed obliquely on the upper side of the female die, and two rotary locking mechanisms movably disposed between the upper die holder and the lower die holder. The two rotary locking mechanisms are symmetrically disposed on both sides of the blank holder and the female die, and the bottom surface of the female die is used to abut against the top surface of the blank holder; when the upper die holder and the lower die holder are closed, the rotary locking mechanisms press the upper elastic component and the lower elastic component and lock the blank holder and the female die to apply a constant locking force to the blank holder and the female die.

[0006] Furthermore, the rotary locking mechanism includes a lifting plate, a nitrogen spring, a rotary locking piece, a pendulum block, a resistance block and a stop block. The rotary locking piece is in the shape of a Chinese character "匚". The nitrogen spring is installed on the upper side surface of the lower die base, and the nitrogen spring is located outside the peripheral side of the punch. The lifting plate is installed on the top of the nitrogen spring and is located below the blank holder. The opening of the rotary locking piece faces the lower blank holder and the die. The bottom of the rotary locking piece is rotatably connected to the lifting plate, and the bottom of the rotary locking piece is located between the lifting plate and the lower elastic component. The bottom of the rotary locking piece is used to apply pressure to the lower elastic component, and the top of the rotary locking piece is used to apply pressure to the upper elastic component. The pendulum block is rotatably connected to the lower die base and is located on the side of the rotary locking piece away from the blank holder. The inner side surface of the pendulum block is used to resist the outer side surface of the rotary locking piece. The resistance block is installed on the lower die base and is located The side of the pendulum block away from the rotary locking piece, the top inner side surface of the interference block is provided with an interference slope and a vertical surface in sequence from top to bottom, the outer side surface of the pendulum block is used to interfere with the interference slope or the vertical surface, the stop block is installed on the lower side of the upper die seat, the stop block is located above the interference block, the stop block is used to interfere with the outer side surface of the pendulum block, and the stop surface of the stop block and the vertical surface are on the same vertical plane; when the outer side surface of the pendulum block interferes with the interference slope, the pendulum block and the rotary locking piece are both rotated outward to an inclined state, and the rotary locking piece releases the die and the pressure ring; when the outer side surface of the pendulum frame interferes with the vertical surface, the pendulum block and the rotary locking piece are both rotated inward to a vertical state, the rotary locking piece locks the die and the pressure ring and applies pressure to the upper elastic component and the lower elastic component, so that the rotary locking piece applies a constant locking force to the die and the pressure ring.

[0007] Furthermore, the rotary locking member is rotatably connected to the lifting plate via a first rotating shaft, and the swing block is rotatably connected to the lower mold base via a second rotating shaft.

[0008] Furthermore, the rotary locking mechanism also includes a first reset driving member installed on the upper mold base, and the first reset driving member is used to apply a reset driving force for outward rotation to the top end surface of the rotary locking member.

[0009] Furthermore, the rotary locking mechanism also includes a second reset driving member installed on the abutment block and located on the vertical surface, and the second reset driving member is used to apply an inwardly rotating reset driving force to the bottom outer side surface of the pendulum block.

[0010] Furthermore, the rotary locking mechanism also includes a third reset driving member installed on the lifting plate, and the third reset driving member is used to apply an upward reset driving force to the bottom surface of the rotary locking member, so that the rotary locking member rotates outward.

[0011] Furthermore, the top surface of the lifting plate is provided with an avoidance slope, which can provide an avoidance space for the rotary locking member to rotate outward.

[0012] Furthermore, the upper elastic component and the lower elastic component are both disc spring components.

[0013] Further, a first wear-resistant plate is embedded on the inner side surface of the swing block, and the first wear-resistant plate is used to abut against the outer side surface of the rotary locking member.

[0014] Further, a second wear-resistant plate is embedded on the stopping surface of the stopping block, and the second wear-resistant plate is used to abut against the outer side surface of the swing block.

[0015] Advantages of the present invention: In practical applications, when the upper die base and the lower die base are in the open die state, the two rotary locking mechanisms release the edges of the female die and the blank holder, and the female die is separated from the blank holder. At this time, the workpiece can be placed on the punch and the blank holder. Then, the stamping machine drives the upper die base to drive the female die downward. As the female die moves downward, the bottom surface of the female die will press the edge of the workpiece against the blank holder, and the two rotary locking mechanisms will rotate and apply pressure to the upper elastic component and the lower elastic component, so that the elastic forces of the upper elastic component and the lower elastic component act on the female die and the blank holder, making the female die and the blank holder press the edge of the workpiece tightly. At the same time, the rotary locking mechanism locks the edges of the female die and the blank holder and the locking force is constant, so that the pressing force of the edges of the female die and the blank holder pressing the edge of the workpiece is constant. As the lower die base continues to move downward, the lower die base drives the female die and the blank holder locked by the rotary locking mechanism to move downward synchronously until the upper die base and the lower die base are fully closed, and the female die cooperates with the punch to perform stamping and drawing forming on the workpiece. Since the pressing force of the edges of the female die and the blank holder pressing the edge of the workpiece is constant, when performing stamping and drawing forming on the workpiece, the workpiece will not be fractured or torn due to excessive pressing force during stamping and drawing forming, nor will it wrinkle or crease due to too small pressing force during stamping and drawing forming. Also, since the rotary locking mechanism locks the edges of the female die and the blank holder, the rotary locking mechanism can cancel the rebound counter-forces of the upper elastic component and the lower elastic component, so that the stamping machine will not be impacted by the counter-forces during the stamping drive process, which plays a role in protecting the stamping machine, reduces the performance usage requirements for the stamping machine, makes the forming force stable when the female die and the punch perform stamping and drawing forming on the workpiece, and thus improves the quality of stamping and drawing forming on the workpiece. After stamping and drawing forming, the upper die base and the lower die base are gradually opened, and the rotary locking mechanism gradually releases the locking of the female die and the blank holder, so as to facilitate taking away the formed workpiece and loading the workpiece to be formed. The present invention locks the edges of the female die and the blank holder by the rotary locking mechanism and the locking force is constant, so that the pressing force of the edges of the female die and the blank holder pressing the edge of the workpiece is constant, and cancels the rebound counter-forces of the upper elastic component and the lower elastic component, thereby improving the stability of stamping and drawing forming on the workpiece, and there will be no problems of tearing or wrinkling, and improving the quality of stamping and drawing forming. Description of the Drawings

[0016] Figure 1 It is a cross-sectional view of the present invention at the initial stage of die closing.

[0017] Figure 2 This is a cross-sectional view of the present invention in the locking stage of mold clamping.

[0018] Figure 3 This is a cross-sectional view of the present invention in the fully closed mold state.

[0019] Description of reference numerals:

[0020] 1. Lower die base; 2. Punch; 3. Blank holder; 4. Lower elastic component; 5. Upper die base; 6. Die cavity; 7. Upper elastic component; 8. Rotary locking mechanism; 9. Lifting plate; 10. Nitrogen spring; 11. Rotary locking part; 12. Swing block; 13. Contact block; 14. Stopping block; 15. Contact inclined surface; 16. Vertical surface; 17. First rotating shaft; 18. Second rotating shaft; 19. First reset driving part; 20. Second reset driving part; 21. Third reset driving part; 22. Avoiding inclined surface; 23. First wear-resistant plate; 24. Second wear-resistant plate. Detailed implementation manners

[0021] For the convenience of understanding by those skilled in the art, the present invention will be further described below in conjunction with embodiments and the accompanying drawings. The content mentioned in the implementation manners does not limit the present invention.

[0022] As Figures 1 to 3 shown, a stamping drawing die with a constant locking force provided by the present invention includes a lower die base 1, a punch 2 disposed on the upper side of the lower die base 1, a blank holder 3 sleeved on the outer side wall of the punch 2 in a lifting manner, a lower elastic component 4 disposed obliquely on the lower side of the blank holder 3, an upper die base 5 disposed above the lower die base 1 in a lifting manner, a die cavity 6 disposed on the lower side of the upper die base 5 and adapted to be concave-convex with the punch 2, an upper elastic component 7 disposed obliquely on the upper side of the die cavity 6, and two rotary locking mechanisms 8 movably disposed between the upper die base 5 and the lower die base 1. The two rotary locking mechanisms 8 are symmetrically disposed on both sides of the blank holder 3 and the die cavity 6, and the bottom surface of the die cavity 6 is used to contact the top surface of the blank holder 3; when the upper die base 5 and the lower die base 1 are closed, the rotary locking mechanism 8 presses the upper elastic component 7 and the lower elastic component 4 and locks the blank holder 3 and the die cavity 6 to apply a constant locking force to the blank holder 3 and the die cavity 6.

[0023] In practical applications, when the upper die base 5 and the lower die base 1 are in the open die state, the two rotary locking mechanisms 8 release the edge of the female die 6 and the blank holder 3, and the female die 6 is separated from the blank holder 3. At this time, the workpiece can be placed on the punch 2 and the blank holder 3. Then, the punching machine drives the upper die base 5 together with the female die 6 to move downward. As the female die 6 moves downward, the bottom surface of the female die 6 presses the edge of the workpiece against the blank holder 3, and the two rotary locking mechanisms 8 will rotate and press the upper elastic component 7 and the lower elastic component 4 upward, so that the elastic forces of the upper elastic component 7 and the lower elastic component 4 act on the female die 6 and the blank holder 3, causing the female die 6 and the blank holder 3 to press the edge of the workpiece tightly. At the same time, the rotary locking mechanism 8 locks the edge of the female die 6 and the blank holder 3 with a constant locking force, so that the pressing force of the edge of the female die 6 and the blank holder 3 pressing the edge of the workpiece is constant. As the lower die base 1 continues to move downward, the lower die base 1 drives the female die 6 and the blank holder 3 locked by the rotary locking mechanism 8 to move downward synchronously until the upper die base 5 and the lower die base 1 are fully closed, and the female die 6 cooperates with the punch 2 to perform stamping and drawing forming on the workpiece. Since the pressing force of the female die 6 and the blank holder 3 pressing the edge of the workpiece is constant, when performing stamping and drawing forming on the workpiece, the workpiece will not break or be torn due to excessive pressing force during stamping and drawing forming, nor will it wrinkle or crease due to too small pressing force during stamping and drawing forming. Also, since the rotary locking mechanism 8 locks the edge of the female die 6 and the blank holder 3, the rotary locking mechanism 8 can cancel the rebound opposing force of the upper elastic component 7 and the rebound opposing force of the lower elastic component 4, so that the punching machine will not be impacted by this opposing force during the punching drive process, which plays a protective role for the punching machine, reduces the performance use requirements for the punching machine, and makes the forming force stable when the female die 6 and the punch 2 perform stamping and drawing forming on the workpiece, thereby improving the quality of stamping and drawing forming on the workpiece. After stamping and drawing forming, the upper die base 5 and the lower die base 1 are gradually opened, and the rotary locking mechanism 8 gradually releases the locking of the female die 6 and the blank holder 3, so as to facilitate taking away the formed workpiece and loading the workpiece to be formed. In the present invention, the rotary locking mechanism 8 locks the edge of the female die 6 and the blank holder 3 with a constant locking force, so that the pressing force of the edge of the female die 6 and the blank holder 3 pressing the edge of the workpiece is constant, and cancels the rebound opposing force of the upper elastic component 7 and the lower elastic component 4, thereby improving the stability of stamping and drawing forming on the workpiece, and preventing problems such as tearing or wrinkling, and improving the quality of stamping and drawing forming.

[0024] In this embodiment, the rotary locking mechanism 8 includes a lifting plate 9, a nitrogen spring 10, a rotary locking member 11, a swing block 12, a resistance block 13 and a stop block 14. The rotary locking member 11 is in the shape of a Chinese character "匚". The nitrogen spring 10 is mounted on the upper side of the lower die seat 1. The nitrogen spring 10 is located outside the peripheral side of the punch 2. The lifting plate 9 is mounted on the top of the nitrogen spring 10 and is located below the blank holder 3. The opening of the rotary locking member 11 faces the lower blank holder 3 and the die 6. The bottom of the rotary locking member 11 is rotatably connected to the lifting plate 9. The rotary locking member 11 is rotatably connected to the lifting plate 9. The bottom of the locking member 11 is located between the lifting plate 9 and the lower elastic component 4, the bottom of the rotating locking member 11 is used to apply pressure to the lower elastic component 4, the top of the rotating locking member 11 is used to apply pressure to the upper elastic component 7, the swing block 12 is rotatably connected to the lower die base 1 and is located on the side of the rotating locking member 11 away from the blank holder 3, the inner side of the swing block 12 is used to contact the outer side of the rotating locking member 11, the contact block 13 is installed on the lower die base 1 and is located on the side of the swing block 12 away from the rotating locking member 11, and the top inner side of the contact block 13 From top to bottom, a resisting inclined surface 15 and a vertical surface 16 are sequentially arranged. The outer side surface of the pendulum block 12 is used to resist the resisting inclined surface 15 or the vertical surface 16. The stop block 14 is installed on the lower side of the upper mold base 5. The stop block 14 is located above the resisting block 13. The stop block 14 is used to resist the outer side surface of the pendulum block 12. The stop surface of the stop block 14 and the vertical surface 16 are on the same vertical surface 16. When the outer side surface of the pendulum block 12 is in contact with the resisting inclined surface 15, the pendulum block 12 and the rotary locking member 11 are both rotated outward to a tilted state, and the rotary lock 11 is rotated outward to a tilted state. The tightening piece 11 releases the die 6 and the blank holder 3; when the outer side surface of the swing frame contacts the vertical surface 16, the swing block 12 and the rotary locking piece 11 both rotate inward to a vertical state, and the rotary locking piece 11 locks the die 6 and the blank holder 3 and applies pressure to the upper elastic component 7 and the lower elastic component 4, so that the rotary locking piece 11 applies a constant locking force to the die 6 and the blank holder 3; specifically, the rotary locking piece 11 is rotatably connected to the lifting plate 9 via the first rotating shaft 17, and the swing block 12 is rotatably connected to the lower die base 1 via the second rotating shaft 18.

[0025] In practical applications, both the swing block 12 and the rotary locking member 11 are in an outwardly inclined state. The outer side surface of the swing block 12 abuts against the abutting inclined surface 15, the outer side surface of the rotary locking member 11 abuts against the inner side surface of the swing block 12, the stop block 14 is separated from the swing block 12 and is located above the swing block 12, the nitrogen spring 10 is in an extended state, the lifting plate 9 lifts the blank holder 3 or lifts the blank holder 3 via the bottom of the rotary locking member 11. At this time, the workpiece is placed on the punch 2 and the blank holder 3. Then, the stamping machine drives the upper die holder 5 to close with the lower die holder 1. The bottom surface of the female die 6 first presses the edge of the workpiece against the top surface of the blank holder 3. As the female die 6 moves downward, the blank holder 3 will abut against the bottom of the rotary locking member 11 or / and the lifting plate 9 moves downward and compresses the nitrogen spring 10. During the downward movement of the rotary locking member 11, the rotary locking member 11 will rotate inwardly around the first rotating shaft 17. Under the action of the downward movement and inward rotation of the rotary locking member 11, the outer side surface of the rotary locking member 11 slides and abuts against the inner side surface of the swing block 12, and abuts against the swing block 12 to swing inwardly around the second rotating shaft 18 until both the rotary locking member 11 and the swing block 12 rotate to the vertical state. The rotary locking member 11 locks the edge of the female die 6 and the blank holder 3 and presses on the upper elastic component 7 and the lower elastic component 4 upward. At this time, the outer side surface of the rotary locking member 11 abuts against the inner side surface of the swing block 12, and the outer side surface of the swing block 12 abuts against the vertical surface 16 of the abutting block 13. When the upper die holder 5 and the lower die holder 1 are completely closed, the stop surface of the stop block 14 abuts against the outer side surface of the swing block 12, and the swing block 12 is abutted and limited by the stop surface and the vertical surface 16 of the stop block 14 to limit the swing block 12 in the vertical state. The swing block 12 in the vertical state abuts against the rotary locking member 11 to limit the rotary locking member 11 in the vertical state, so that the rotary locking member 11 can firmly lock the female die 6 and the blank holder 3, and the locking force is constant. The upper elastic component 7 and the lower elastic component 4 are pressed by the rotary locking member 11, so that the female die 6 and the blank holder 3 press the workpiece with a constant pressing force, and the rotary locking member 11 can also offset the outward counteracting force of the upper elastic component 7 and the lower elastic component 4. When the stamping and drawing forming is completed, the upper die holder 5 and the lower die holder 1 are opened, the stop block 14 is separated from the swing block 12, the nitrogen spring 10 elastically extends and drives the lifting plate 9 to move upward and reset. The upward moving lifting plate 9 will push the bottom surface of the rotary locking member 11 upward, so that the rotary locking member 11 rotates outwardly and moves upward and the blank holder 3 moves upward. The rotary locking member 11 that rotates outwardly and moves upward abuts against the swing block 12 to swing outwardly until the outer side surface of the swing block 12 abuts against the abutting inclined surface 15 to realize the automatic reset of the rotary locking member 11 and the swing block 12.

[0026] In this embodiment, the rotation locking mechanism 8 further includes a first reset driving member 19 installed on the upper die base 5. The first reset driving member 19 is used to apply a reset driving force for outward rotation to the top end face of the rotation locking member 11. During the process of the rotation locking member 11 locking the edge of the female die 6 and the blank holder 3, the top end face of the rotation locking member 11 will compress the first reset driving member 19; during the mold opening process of the upper die base 5 and the lower die base 1, as the rotation locking member 11 rotates outward, the first reset driving member 19 will extend and push the top end face of the rotation locking member 11 to rotate outward, so as to assist the rotation locking member 11 to rotate outward and reset.

[0027] In this embodiment, the rotation locking mechanism 8 further includes a second reset driving member 20 installed on the contact block 13 and located at the vertical plane 16. The second reset driving member 20 is used to apply a reset driving force for inward rotation to the outer bottom surface of the swing block 12. When the swing block 12 is in the vertical state, the outer side surface of the swing block 12 compresses the second reset driving member 20; during the mold opening process of the upper die base 5 and the lower die base 1, as the swing block 12 swings outward, the second reset driving member 20 will extend and push the bottom of the swing block 12 to swing inward, so that the whole swing block 12 swings outward, so as to assist the swing block 12 to swing outward and reset.

[0028] In this embodiment, the rotation locking mechanism 8 further includes a third reset driving member 21 installed on the lifting plate 9. The third reset driving member 21 is used to apply an upward reset driving force to the bottom bottom surface of the rotation locking member 11, so that the rotation locking member 11 rotates outward. When the rotation locking member 11 locks the edge of the female die 6 and the blank holder 3, the bottom bottom surface of the rotation locking member 11 in the vertical state compresses the third reset driving member 21; during the mold opening process of the upper die base 5 and the lower die base 1, as the rotation locking member 11 gradually rotates outward, the third reset driving member 21 extends and pushes the bottom bottom surface of the rotation locking member 11 upward, so as to assist the rotation locking member 11 to rotate outward and reset.

[0029] In this embodiment, the top surface of the lifting plate 9 is provided with an avoidance inclined surface 22. The avoidance inclined surface 22 can provide an avoidance space for the rotation locking member 11 to rotate outward, so as to prevent the bottom of the rotation locking member 11 from interfering with the lifting plate 9 during the process of the rotation locking member 11 rotating outward and unable to rotate outward and reset normally.

[0030] In this embodiment, both the upper elastic component 7 and the lower elastic component 4 are disc spring components. According to the different magnitudes of the pressing forces required for different workpieces, the magnitude of the pressing force can be adjusted by adjusting the initial compression amount of the disc spring component.

[0031] In this embodiment, a first wear-resistant plate 23 is embedded on the inner side surface of the swing block 12, and the first wear-resistant plate 23 is used to abut against the outer side surface of the rotary locking member 11. Since the inner side surface of the swing block 12 often abuts against and relatively slides with the outer side surface of the rotary locking member 11, it is prone to wear. The setting of the first wear-resistant plate 23 has good wear resistance and a long service life. Moreover, when the first wear-resistant plate 23 is worn, only the first wear-resistant plate 23 needs to be replaced, which is convenient for maintenance and reduces the maintenance cost.

[0032] In this embodiment, a second wear-resistant plate 24 is embedded on the abutting surface of the stop block 14, and the second wear-resistant plate 24 is used to abut against the outer side surface of the swing block 12. Since the abutting surface of the stop block 14 often abuts against and relatively slides with the outer side surface of the swing block 12, it is prone to wear. The setting of the second wear-resistant plate 24 has good wear resistance and a long service life. Moreover, when the second wear-resistant plate 24 is worn, only the second wear-resistant plate 24 needs to be replaced, which is convenient for maintenance and reduces the maintenance cost.

[0033] All the technical features in this embodiment can be freely combined according to actual needs.

[0034] The above embodiments are the 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 technical solution of the present invention is within the protection scope of the present invention.

Claims

1. A stamping and drawing die with a constant locking force, characterized in that: It includes a lower die base (1), a punch (2) arranged on the upper side of the lower die base (1), a blank holder (3) sleeved on the outer side wall of the punch (2) in a lifting manner, a lower elastic component (4) arranged obliquely on the lower side of the blank holder (3), an upper die base (5) arranged above the lower die base (1) in a lifting manner, a die cavity (6) arranged on the lower side of the upper die base (5) and used for concave-convex adaptation with the punch (2), an upper elastic component (7) arranged obliquely on the upper side of the die cavity (6), and two rotary locking mechanisms (8) movably arranged between the upper die base (5) and the lower die base (1). The two rotary locking mechanisms (8) are symmetrically arranged on both sides of the blank holder (3) and the die cavity (6), and the bottom surface of the die cavity (6) is used for abutting against the top surface of the blank holder (3); when the upper die base (5) and the lower die base (1) are closed, the rotary locking mechanism (8) presses on the upper elastic component (7) and the lower elastic component (4) and locks the blank holder (3) and the die cavity (6) to apply a constant locking force to the blank holder (3) and the die cavity (6).

2. A stamping and drawing die with a constant locking force according to claim 1, characterized in that: The rotary locking mechanism (8) includes a lifting plate (9), a nitrogen spring (10), a rotary locking member (11), a swing block (12), a contact block (13) and a stop block (14). The rotary locking member (11) is in a U shape. The nitrogen spring (10) is installed on the upper side of the lower die base (1), and the nitrogen spring (10) is located outside the circumference of the punch (2). The lifting plate (9) is installed at the top of the nitrogen spring (10) and is located below the blank holder (3). The opening of the rotary locking member (11) faces downward to the blank holder (3) and the die (6). The bottom of the rotary locking member (11) is rotatably connected to the lifting plate (9). The bottom of the rotary locking member (11) is located between the lifting plate (9) and the lower elastic component (4). The bottom of the rotary locking member (11) is used to press the lower elastic component (4). The top of the rotary locking member (11) is used to press the upper elastic component (7). The swing block (12) is rotatably connected to the lower die base (1) and is located on the side of the rotary locking member (11) away from the blank holder (3). The inner side surface of the swing block (12) is used to contact the outer side surface of the rotary locking member (11). The contact block (13) is installed on the lower die base (1) and is located on the side of the swing block (12) away from the rotary locking member (11). The inner side surface of the top of the contact block (13) is sequentially provided with a contact inclined surface (15) and a vertical surface (16) from top to bottom. The outer side surface of the swing block (12) is used to contact the contact inclined surface (15) or the vertical surface (16). The stop block (14) is installed on the lower side of the upper die base (5). The stop block (14) is located above the contact block (13). The stop block (14) is used to contact the outer side surface of the swing block (12). The stop surface of the stop block (14) and the vertical surface (16) are on the same vertical surface (16). When the outer side surface of the swing block (12) contacts the contact inclined surface (15), both the swing block (12) and the rotary locking member (11) rotate outward to an inclined state, and the rotary locking member (11) releases the die (6) and the blank holder (3). When the outer side surface of the swing frame contacts the vertical surface (16), both the swing block (12) and the rotary locking member (11) rotate inward to a vertical state, and the rotary locking member (11) locks the die (6) and the blank holder (3) and presses the upper elastic component (7) and the lower elastic component (4), so that the rotary locking member (11) applies a constant locking force to the die (6) and the blank holder (3).

3. The stamping and drawing die with a constant locking force according to claim 2, characterized in that: The rotary locking member (11) is rotatably connected to the lifting plate (9) via a first rotating shaft (17), and the swing block (12) is rotatably connected to the lower die base (1) via a second rotating shaft (18).

4. A stamping and drawing die with a constant locking force according to claim 2, characterized in that: The rotary locking mechanism (8) further includes a first reset driving member (19) installed on the upper die base (5). The first reset driving member (19) is used to apply a reset driving force for outward rotation to the top end face of the rotary locking member (11).

5. A stamping and drawing die with a constant locking force according to claim 2, characterized in that: The rotary locking mechanism (8) further includes a second reset driving member (20) installed on the contact block (13) and located at the vertical surface (16). The second reset driving member (20) is used to apply a reset driving force for inward rotation to the outer side surface of the bottom of the swing block (12).

6. A stamping and drawing die with a constant locking force according to claim 2, characterized in that: The rotary locking mechanism (8) further includes a third reset driving member (21) disposed on the lifting plate (9). The third reset driving member (21) is used to apply an upward reset driving force to the bottom surface of the rotary locking member (11), so that the rotary locking member (11) rotates outward.

7. A stamping and drawing die with a constant locking force according to claim 1, characterized in that: The top surface of the lifting plate (9) is provided with an avoidance inclined surface (22), and the avoidance inclined surface (22) can provide an avoidance space for the outward rotation of the rotary locking member (11).

8. A stamping and drawing die with a constant locking force according to claim 1, characterized in that: Both the upper elastic component (7) and the lower elastic component (4) are disc spring components.

9. A stamping and drawing die with a constant locking force according to claim 2, characterized in that: A first wear-resistant plate (23) is embedded on the inner side surface of the swing block (12), and the first wear-resistant plate (23) is used to contact the outer side surface of the rotary locking member (11).

10. A stamping and drawing die with a constant locking force according to claim 1, characterized in that: A second wear-resistant plate (24) is embedded on the blocking surface of the blocking block (14), and the second wear-resistant plate (24) is used to contact the outer side surface of the swing block (12).

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