Stamping drawing die with constant locking force

Abstract

The utility model 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] This utility model relates to the field of stamping and drawing die technology, and in particular to a stamping and drawing die with constant locking force. Background Technology

[0002] Currently, in the stamping and drawing process of automotive sheet metal, as the stamping press drives the upper die holder to move the die downwards, the bottom surface of the die presses the edge of the workpiece against the blank holder. A nitrogen spring provides elastic force to the blank holder so that the die and blank holder can press the edge of the workpiece. However, as the die, workpiece, and blank holder gradually move downwards, the compression of the nitrogen spring increases, and the elastic force applied by the nitrogen spring to the blank holder gradually increases, resulting in a gradual increase in the clamping force on the workpiece. This leads to instability in the clamping force. When the clamping force is too large, the workpiece is prone to breakage or tearing during the stamping and drawing process. When the clamping force is too small, the workpiece is prone to wrinkling or rubbing during the stamping and drawing process, making it difficult to guarantee the quality of the workpiece during stamping and drawing. Furthermore, the upward elastic force of the nitrogen spring will generate an outward counterforce, which will ultimately act on the stamping press to form a resistance force against the stamping press, causing impact on the stamping press and thus increasing the performance requirements of the stamping press. Therefore, the defects are very obvious, and a solution is urgently needed. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a stamping and drawing die with constant locking force.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A stamping and drawing die with constant locking force includes a lower die base, a punch disposed on the upper side of the lower die base, a blank holder sleeved on the outer side wall of the punch, a lower elastic component disposed on the lower side of the blank holder, an upper die base disposed on the upper side of the lower die base, a die disposed on the lower side of the upper die base for fitting with the punch, an upper elastic component disposed on the upper side of the die, and two rotary locking mechanisms movably disposed between the upper die base and the lower die base. The two rotary locking mechanisms are symmetrically disposed on both sides of the blank holder and the die, and the bottom surface of the die is used to abut against the top surface of the blank holder. When the upper die base and the lower die base are closed, the rotary locking mechanisms apply pressure to the upper elastic component and the lower elastic component and lock the blank holder and the die, so as to apply a constant locking force to the blank holder and the die.

[0006] Furthermore, the rotary locking mechanism includes a lifting plate, a nitrogen spring, a rotary locking component, a swing block, an abutment block, and a stop block. The rotary locking component is U-shaped. The nitrogen spring is mounted on the upper side of the lower die base, located outside the periphery of the punch. The lifting plate is mounted on the top of the nitrogen spring and located below the pressure ring. The opening of the rotary locking component faces downward towards the pressure ring and the die. The bottom of the rotary locking component is rotatably connected to the lifting plate, located between the lifting plate and the lower elastic component. The bottom of the rotary locking component applies pressure to the lower elastic component, and the top of the rotary locking component applies pressure to the upper elastic component. The swing block is rotatably connected to the lower die base and located on the side of the rotary locking component away from the pressure ring. The inner side of the swing block abuts against the outer side of the rotary locking component. The abutment block is mounted on the lower die base and located... The side of the swing block away from the rotating locking member has a top inner side with a contact slope and a vertical surface arranged sequentially from top to bottom. The outer side of the swing block is used to contact the contact slope or the vertical surface. The stop block is installed on the lower side of the upper mold base and is located above the contact block. The stop block is used to contact the outer side of the swing block, and the stop surface of the stop block is on the same vertical surface as the vertical surface. When the outer side of the swing block contacts the contact slope, both the swing block and the rotating locking member rotate outward to the inclined state, and the rotating locking member releases the die and the pressure ring. When the outer side of the swing frame contacts the vertical surface, both the swing block and the rotating locking member rotate inward to the vertical state, and the rotating locking member locks the die and the pressure ring and applies pressure to the upper and lower elastic components so that the rotating locking member applies a constant locking force to the die and the pressure ring.

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

[0008] Furthermore, the rotary locking mechanism also includes a first reset drive member mounted on the upper mold base, which is used to apply an outward rotational reset drive force to the top end face of the rotary locking member.

[0009] Furthermore, the rotary locking mechanism also includes a second reset drive member mounted on the abutment block and located in the vertical plane, the second reset drive member being used to apply an inward rotational reset drive force to the bottom outer side of the swing block.

[0010] Furthermore, the rotary locking mechanism also includes a third reset drive member mounted on the lifting plate. The third reset drive member is used to apply an upward reset drive force to the bottom surface of the rotary locking member, causing the rotary locking member to rotate outward.

[0011] Furthermore, the top surface of the lifting plate is provided with a clearance ramp, which provides clearance space for the rotating locking component to rotate outward.

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

[0013] Furthermore, a first wear-resistant plate is embedded on the inner side of the swing block, which is used to abut against the outer side of the rotating locking member.

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

[0015] The beneficial effects of this utility model are as follows: In practical applications, when the upper and lower die bases are in the open state, the two rotary locking mechanisms release the edge of the die cavity and the blank holder, separating the die cavity from the blank holder. At this time, the workpiece can be placed on the punch and the blank holder. Then, the press drives the upper die base to move the die cavity downwards. As the die cavity moves downwards, the bottom surface of the die cavity will press the edge of the workpiece against the blank holder. Furthermore, the two rotary locking mechanisms will rotate and apply pressure to the upper and lower elastic components, causing the upper elastic component to... The elastic force of the upper and lower elastic components acts on the die and blank holder, causing them to press the edge of the workpiece tightly. Simultaneously, a rotary locking mechanism locks the edge of the die and blank holder with a constant locking force, ensuring a constant pressing force between the die edge and the blank holder on the workpiece edge. As the lower die holder continues to move downwards, it drives the die and blank holder, locked by the rotary locking mechanism, to move downwards synchronously until the upper and lower die holders are fully closed. The die and punch then cooperate to stamp and draw the workpiece. Because the pressing force between the die and blank holder on the workpiece edge is constant, the workpiece will not break or tear during stamping and drawing due to excessive pressure, nor will it wrinkle or develop wrinkles due to insufficient pressure. Furthermore, because the rotary locking mechanism locks the edge of the die and the blank holder, it can cancel out the springback force of the upper and lower elastic components, preventing the press from being impacted by this force during the stamping process. This protects the press, reduces the performance requirements, and stabilizes the forming force during stamping and drawing, thereby improving the quality of the stamping and drawing process. After stamping and drawing, the upper and lower die holders gradually open, and the rotary locking mechanism gradually releases its lock on the die and blank holder, facilitating the removal of the formed workpiece and the loading of the workpiece to be formed. This invention uses a rotary locking mechanism to lock the edge of the die to the pressure ring with a constant locking force. This ensures that the clamping force between the edge of the die and the pressure ring on the edge of the workpiece is constant, and also counteracts the springback force of the upper and lower elastic components. This improves the stability of the stamping and drawing process, preventing cracking or wrinkling, and thus enhancing the quality of the stamping and drawing process. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the present invention in the initial stage of mold closing.

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

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

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Lower die base; 2. Punch; 3. Pressure ring; 4. Lower elastic component; 5. Upper die base; 6. Die; 7. Upper elastic component; 8. Rotary locking mechanism; 9. Lifting plate; 10. Nitrogen spring; 11. Rotary locking component; 12. Swing block; 13. Abutting block; 14. Stop block; 15. Abutting inclined surface; 16. Vertical surface; 17. First rotating shaft; 18. Second rotating shaft; 19. First reset drive component; 20. Second reset drive component; 21. Third reset drive component; 22. Avoidance inclined surface; 23. First wear-resistant plate; 24. Second wear-resistant plate. Detailed Implementation

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0022] like Figures 1 to 3 As shown, the present invention provides a stamping and drawing die with constant locking force, comprising a lower die base 1, a punch 2 disposed on the upper side of the lower die base 1, a blank holder 3 flexibly sleeved on the outer side wall of the punch 2, a lower elastic component 4 inclinedly disposed on the lower side of the blank holder 3, an upper die base 5 flexibly disposed above the lower die base 1, a die 6 disposed on the lower side of the upper die base 5 for fitting with the punch 2, an upper elastic component 7 inclinedly disposed on the upper side of the die 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 6, and the bottom surface of the die 6 is used to abut 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 mechanisms 8 apply pressure to the upper elastic component 7 and the lower elastic component 4 and lock the blank holder 3 and the die 6 to apply a constant locking force to the blank holder 3 and the die 6.

[0023] In practical applications, when the upper die holder 5 and the lower die holder 1 are in the open state, the two rotary locking mechanisms 8 release the edge of the die cavity 6 and the pressure ring 3, separating the die cavity 6 from the pressure ring 3. At this time, the workpiece can be placed on the punch 2 and the pressure ring 3. Then, the press drives the upper die holder 5 to move the die cavity 6 downward. As the die cavity 6 moves downward, the bottom surface of the die cavity 6 will press the edge of the workpiece against the pressure ring 3, and the two rotary locking mechanisms 8 will rotate and apply pressure to the upper elastic component 7 and the lower elastic component 4, causing the upper elastic component 7 and the lower elastic component 4 to... The elastic force of component 4 acts on the die 6 and the blank holder 3, causing the 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 die 6 and the blank holder 3 with a constant locking force, ensuring that the pressing force between the edge of the die 6 and the blank holder 3 on the edge of the workpiece is constant. As the lower die base 1 continues to move downward, the lower die base 1 drives the die 6 and the blank holder 3, which are 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. The die 6 and the punch 2 then cooperate to perform stamping and drawing forming of the workpiece. Because the pressing force between the die 6 and the blank holder 3 on the edge of the workpiece is constant, the workpiece will not break or tear during stamping and drawing forming due to excessive pressing force, nor will it wrinkle or crease due to insufficient pressing force. Furthermore, because the rotary locking mechanism 8 locks the edge of the die 6 and the blank holder 3, it can cancel out the springback force of the upper elastic component 7 and the springback force of the lower elastic component 4. This prevents the press from being impacted by the springback force during the stamping process, protecting the press and reducing the performance requirements. It also stabilizes the forming force when the die 6 and punch 2 stamp and draw the workpiece, thereby improving the quality of the stamping and drawing process. After stamping and drawing, the upper die holder 5 and lower die holder 1 gradually open, and the rotary locking mechanism 8 gradually releases its locking of the die 6 and blank holder 3, facilitating the removal of the formed workpiece and the loading of the workpiece to be formed. This invention uses a rotary locking mechanism 8 to lock the edge of the die 6 to the pressure ring 3 with a constant locking force. This ensures that the clamping force between the edge of the die 6 and the pressure ring 3 on the edge of the workpiece is constant, and also counteracts the rebound force of the upper elastic component 7 and the lower elastic component 4. This improves the stability of the stamping and drawing process of the workpiece, prevents cracking or wrinkling, and enhances the quality of the stamping and drawing process.

[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, an abutment block 13, and a stop block 14. The rotary locking member 11 is U-shaped. The nitrogen spring 10 is installed on the upper side of the lower mold base 1, located outside the periphery of the punch 2. The lifting plate 9 is installed at the top of the nitrogen spring 10 and located below the pressure ring 3. The opening of the rotary locking member 11 faces downward towards the pressure ring 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 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 press down on the lower elastic component 4, and the top of the rotating locking member 11 is used to press up on the upper elastic component 7. The swing block 12 is rotatably connected to the lower mold base 1 and is located on the side of the rotating locking member 11 away from the pressure ring 3. The inner side of the swing block 12 is used to abut against the outer side of the rotating locking member 11. The abutment block 13 is installed on the lower mold base 1 and is located on the side of the swing block 12 away from the rotating locking member 11. The top inner side of the abutment block 13... A contacting inclined surface 15 and a vertical surface 16 are arranged sequentially from top to bottom. The outer side of the swing block 12 is used to contact the contacting inclined surface 15 or the vertical surface 16. A stop block 14 is installed on the lower side of the upper mold base 5. The stop block 14 is located above the contact block 13 and is used to contact the outer side of the swing block 12. The stopping surface of the stop block 14 and the vertical surface 16 are on the same vertical surface 16. When the outer side of the swing block 12 contacts the contacting inclined surface 15, both the swing block 12 and the rotary locking member 11 rotate outward to an inclined state. The fastener 11 releases the die 6 and the pressure ring 3; when the outer side of the swing frame abuts against the vertical surface 16, the swing block 12 and the rotary locking member 11 both rotate inward to the vertical position. The rotary locking member 11 locks the die 6 and the pressure ring 3 and applies pressure to 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 pressure ring 3. Specifically, the rotary locking member 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 mold 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 outward tilted state. The outer side of the swing block 12 abuts against the inclined surface 15, and the outer side of the rotary locking member 11 abuts against the inner side of the swing block 12. The stop block 14 is separated from the swing block 12 and located above the swing block 12. The nitrogen spring 10 is in an extended state. The lifting plate 9 lifts the pressure ring 3 or lifts the pressure ring 3 via the bottom of the rotary locking member 11. At this time, the workpiece is placed on the punch 2 and the pressure ring 3. Then, the press drives the upper die holder 5 and the lower die. When the die 1 closes, the bottom surface of the die 6 first presses the edge of the workpiece against the top surface of the pressure ring 3. As the die 6 moves downward, the pressure ring 3 will abut against the bottom of the rotary locking member 11 and / or the lifting plate 9 moves downward and compress the nitrogen spring 10. During the downward movement of the rotary locking member 11, the rotary locking member 11 will rotate inward around the first rotating shaft 17. Under the action of the downward movement and inward rotation of the rotary locking member 11, the outer surface of the rotary locking member 11 slides against the inner surface of the swing block 12, and abuts against the swing block 12 around the second rotating shaft 17. 8. Swing inward until both the rotating locking member 11 and the swing block 12 are rotated to a vertical position. The rotating locking member 11 locks the edge of the die 6 and the pressure ring 3 and applies pressure to the upper elastic component 7 and the lower elastic component 4. At this time, the outer side of the rotating locking member 11 abuts against the inner side of the swing block 12, and the outer side of the swing block 12 abuts against the vertical surface 16 of the abutting block 13. When the upper die base 5 and the lower die base 1 are fully closed, the stopping surface of the stop block 14 abuts against the outer side of the swing block 12. The stopping surface and the vertical surface 16 of the stop block 14 exert pressure on the swing block. 12 engages in a stop to restrict the swing block 12 to a vertical position. The vertically positioned swing block 12 abuts against the rotary locking member 11 to restrict the rotary locking member 11 to a vertical position, so that the rotary locking member 11 can securely lock the die 6 and the pressure ring 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 die 6 and the pressure ring 3 press the workpiece with a constant clamping force, and the rotary locking member 11 can also counteract the outward pushing force of the upper elastic component 7 and the lower elastic component 4. After the stamping and drawing process is completed, the upper die holder 5 and the lower die holder 1 open, the stop block 14 separates from the swing block 12, the nitrogen spring 10 stretches elastically and drives the lifting plate 9 to move up 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 outward and moves upward, and the pressure ring 3 moves upward. The rotary locking member 11, which rotates outward and moves upward, abuts against the swing block 12 and swings outward until the outer side of the swing block 12 abuts against the abutting inclined surface 15, so as to realize the automatic reset of the rotary locking member 11 and the swing block 12.

[0026] In this embodiment, the rotary locking mechanism 8 further includes a first reset drive member 19 mounted on the upper mold base 5. The first reset drive member 19 is used to apply an outward rotational reset driving force to the top end face of the rotary locking member 11. During the process of the rotary locking member 11 locking the edge of the die 6 and the pressure ring 3, the top end face of the rotary locking member 11 will compress the first reset drive member 19. During the process of the upper mold base 5 and the lower mold base 1 opening the mold, as the rotary locking member 11 rotates outward, the first reset drive member 19 will extend and push the top end face of the rotary locking member 11 to rotate outward, so as to assist the rotary locking member 11 to rotate outward and reset.

[0027] In this embodiment, the rotary locking mechanism 8 further includes a second reset drive member 20 mounted on the abutment block 13 and located on the vertical surface 16. The second reset drive member 20 is used to apply an inward rotational reset driving force to the bottom outer side of the swing block 12. When the swing block 12 is in a vertical state, the outer side of the swing block 12 compresses the second reset drive member 20. During the mold opening process between the upper mold base 5 and the lower mold base 1, as the swing block 12 swings outward, the second reset drive member 20 extends and pushes the bottom of the swing block 12 to swing inward, thereby causing the entire swing block 12 to swing outward to assist the swing block 12 in swinging outward and resetting.

[0028] In this embodiment, the rotary locking mechanism 8 further includes a third reset drive member 21 mounted on the lifting plate 9. The third reset drive member 21 is used to apply an upward reset driving force to the bottom surface of the rotary locking member 11, causing the rotary locking member 11 to rotate outward. When the rotary locking member 11 locks the edge of the die 6 with the pressure ring 3, the bottom surface of the rotary locking member 11, which is in a vertical state, compresses the third reset drive member 21. During the mold opening process between the upper mold base 5 and the lower mold base 1, as the rotary locking member 11 gradually rotates outward, the third reset drive member 21 extends and pushes the bottom surface of the rotary locking member 11 upward to assist the rotary locking member 11 in rotating outward and resetting.

[0029] In this embodiment, the top surface of the lifting plate 9 is provided with a clearance slope 22. The clearance slope 22 can provide clearance space for the rotating locking member 11 to rotate outward, so as to avoid the bottom of the rotating locking member 11 interfering with the lifting plate 9 during the outward rotation of the rotating locking member 11 and thus being 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 assemblies. The clamping force can be adjusted by changing the initial compression of the disc spring assembly, depending on the different clamping forces required for different workpieces.

[0031] In this embodiment, a first wear-resistant plate 23 is embedded on the inner side of the swing block 12. The first wear-resistant plate 23 is used to abut against the outer side of the rotary locking member 11. Since the inner side of the swing block 12 frequently abuts against and slides relative to the outer side of the rotary locking member 11, it is prone to wear. The first wear-resistant plate 23 provides 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, making maintenance convenient and reducing maintenance costs.

[0032] In this embodiment, a second wear-resistant plate 24 is embedded in the stopping surface of the stop block 14. The second wear-resistant plate 24 is used to abut against the outer surface of the swing block 12. Since the stopping surface of the stop block 14 frequently abuts against and slides relative to the outer surface of the swing block 12, it is prone to wear. The second wear-resistant plate 24 provides good wear resistance and a long service life. Moreover, when the second wear-resistant plate 24 is worn, it can be replaced simply, making maintenance convenient and reducing maintenance costs.

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

[0034] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A stamping and drawing die with constant locking force, characterized in that: The assembly includes a lower die base (1), a punch (2) disposed on the upper side of the lower die base (1), a pressure ring (3) that is flexibly sleeved on the outer side wall of the punch (2), a lower elastic component (4) that is inclinedly disposed on the lower side of the pressure ring (3), an upper die base (5) that is flexibly disposed above the lower die base (1), a die (6) disposed on the lower side of the upper die base (5) and used for convex-concave adaptation with the punch (2), an upper elastic component (7) that is inclinedly disposed on the upper side of the die (6), and a component movably disposed on the upper die base (5). Two rotary locking mechanisms (8) are symmetrically arranged on both sides of the pressure ring (3) and the die (6) between the upper mold base (5) and the lower mold base (1). The bottom surface of the die (6) is used to abut against the top surface of the pressure ring (3). When the upper mold base (5) and the lower mold base (1) are closed, the rotary locking mechanism (8) applies pressure to the upper elastic component (7) and the lower elastic component (4) and locks the pressure ring (3) and the die (6) to apply a constant locking force to the pressure ring (3) and the die (6).

2. The stamping and drawing die with 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 component (11), a swing block (12), an abutment block (13), and a stop block (14). The rotary locking component (11) is U-shaped. The nitrogen spring (10) is installed on the upper side of the lower die base (1) and is located outside the periphery of the punch (2). The lifting plate (9) is installed at the top of the nitrogen spring (10) and is located below the pressure ring (3). The opening of the rotary locking component (11) faces downward towards the pressure ring (3) and the die (6). The bottom of the rotary locking component (11) rotates downward. The rotating locking member (11) is movably connected to the lifting plate (9). The bottom of the rotating 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), and 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 mold base (1) and is located on the side of the rotating locking member (11) away from the pressure ring (3). The inner side of the swing block (12) is used to abut against the outer side of the rotating locking member (11). The abutting block (13) is installed on the lower mold base (1) and is located on the swing block (12). On the side away from the rotating locking member (11), the inner top surface of the abutment block (13) is provided with an abutment slope (15) and a vertical surface (16) from top to bottom. The outer surface of the swing block (12) is used to abut against the abutment slope (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 abutment block (13). The stop block (14) is used to abut against the outer surface of the swing block (12). The stopping surface of the stop block (14) and the vertical surface (16) are on the same vertical surface (16). When the outer side of the swing block (12) When the outer side of the frame contacts the inclined surface (15), the swing block (12) and the rotary locking member (11) both rotate outward to the inclined state, and the rotary locking member (11) releases the die (6) and the pressure ring (3); when the outer side of the frame contacts the vertical surface (16), the swing block (12) and the rotary locking member (11) both rotate inward to the vertical state, and the rotary locking member (11) locks the die (6) and the pressure ring (3) and applies pressure to 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 pressure ring (3).

3. The stamping and drawing die with constant locking force according to claim 2, characterized in that: The rotating locking member (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 mold base (1) via the second rotating shaft (18).

4. A stamping and drawing die with constant locking force according to claim 2, characterized in that: The rotary locking mechanism (8) also includes a first reset drive (19) mounted on the upper mold base (5), which is used to apply an outward rotational reset drive force to the top end face of the rotary locking member (11).

5. A stamping and drawing die with constant locking force according to claim 2, characterized in that: The rotary locking mechanism (8) also includes a second reset drive (20) mounted on the abutment block (13) and located on the vertical surface (16), the second reset drive (20) being used to apply an inward rotational reset drive force to the bottom outer side of the swing block (12).

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

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

8. A stamping and drawing die with 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 assemblies.

9. A stamping and drawing die with constant locking force according to claim 2, characterized in that: The inner side of the swing block (12) is fitted with a first wear-resistant plate (23), which is used to abut against the outer side of the rotating locking member (11).

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

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