A mold

Abstract

The utility model relates to a kind of mould, including upper die assembly and lower die assembly, upper die assembly includes upper die holder, material withdrawal plate, fastener, wear-resistant guide sleeve and first spring, multiple first springs are set between upper die holder and material withdrawal plate, lower die assembly includes lower die holder and matrix plate, is equipped with male die head on upper die holder, recess die is set on matrix plate, upper die assembly further includes male die fixed block, recess is set in male die head side, male die fixed block is clamped into recess, threaded hole is equipped on upper die holder, pass through male die positioning block and is screwed into threaded hole by bolt, male die head is fixed on upper die holder;Upper die holder is equipped with ladder through-hole, installation hole is equipped on material withdrawal plate, fastener is passed into ladder through-hole and is detachably fixed with installation hole, fastener and upper die holder can be relatively slid;Wear-resistant guide sleeve is set between ladder through-hole and fastener, male die head is installed without upper die holder, setting wear-resistant guide sleeve significantly reduces the wear rate of fastener and ladder through-hole, belong to mould technical field.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and specifically to a mold. Background Technology

[0002] In the stamping industry, dies are key tooling for forming and punching metal sheets, and their structural design directly affects processing efficiency, product accuracy, and die lifespan. Traditional stamping dies typically consist of an upper die assembly and a lower die assembly. The upper die assembly is mounted on the punch of the stamping press and includes an upper die base and a stripper plate, while the lower die assembly is fixed to the worktable. In existing technologies, the punch head is generally mounted on the upper die base by integral embedding or direct screw fastening. However, this structure has significant drawbacks: when the punch head needs to be replaced or maintained, it is often necessary to disassemble the entire upper die assembly from the stamping press, and even further disassemble multiple connecting parts, which is cumbersome, time-consuming, and seriously affects production efficiency.

[0003] Furthermore, during the stamping process, frequent relative movement occurs between the upper die holder and the ejector plate, subjecting the guide sliding structure to significant frictional and impact loads. Over time, the guide sliding structure is prone to wear, leading to decreased precision, which in turn affects the quality of the stamped parts and shortens the overall lifespan of the die. Utility Model Content

[0004] To address the technical problems existing in the prior art, the purpose of this utility model is to provide a mold in which the punch head is installed by a punch fixing block and bolts, eliminating the need to remove the upper mold base and shortening maintenance time; and to provide a wear-resistant guide sleeve that fits into the fastening rod, which significantly reduces the wear rate of the fasteners and the stepped through hole, thereby increasing the service life of the mold.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The assembly includes an upper die assembly and a lower die assembly. The upper die assembly includes an upper die base, a stripper plate, and a first spring. The stripper plate is located below the upper die base, and a matrix of multiple first springs is arranged between the upper die base and the stripper plate. The upper die base is mounted on the punch of the stamping machine. The lower die assembly includes a lower die base mounted on the worktable of the stamping machine and a die plate fixed on the lower die base. A punch head is provided on the upper die base, which can pass through the stripper plate. A die is correspondingly fitted on the die plate. The upper die assembly also includes a punch fixing block. A groove is provided on the side of the die head, and the punch fixing block is inserted into the groove. A threaded hole is provided on the upper die base. A bolt is passed through the punch positioning block and screwed into the threaded hole to fix the punch head on the upper die base. The upper die assembly also includes a wear-resistant guide sleeve and fasteners. A stepped through hole is provided on the upper die base, and a mounting hole is provided on the ejector plate at the position corresponding to the stepped through hole. The fastener passes through the stepped through hole from top to bottom and is detachably fixed to the mounting hole. The fastener and the upper die base can slide relative to each other. The wear-resistant guide sleeve is provided between the stepped through hole and the fastener.

[0006] As a preferred embodiment, the stepped through hole includes a stepped upper straight hole and a stepped lower straight hole. The diameter of the stepped upper straight hole is larger than the diameter of the stepped lower straight hole. The fastener includes a fastening head and a fastening rod fixed to the fastening head. The diameter of the fastening head is larger than the diameter of the stepped lower straight hole. The fastener passes through the stepped through hole. The lower part of the fastening rod is detachably fixed to the mounting hole. The fastening head is located in the stepped upper straight hole. The diameter of the fastening head is larger than the diameter of the fastening rod. The fastening rod and the stepped lower straight hole can slide relative to each other. The upper mold assembly also includes a wear-resistant guide sleeve. The wear-resistant guide sleeve passes through the stepped through hole. A guide hole is opened in the middle of the wear-resistant guide sleeve from top to bottom. The fastening rod passes through the guide hole, so that the wear-resistant guide sleeve is located between the fastening head and the ejector plate. The wear-resistant guide sleeve and the stepped lower straight hole can slide relative to each other.

[0007] As a preferred embodiment, the wear-resistant guide sleeve includes a wear-resistant guide sleeve head and a wear-resistant guide sleeve rod fixedly connected to the wear-resistant guide sleeve head. The diameter of the wear-resistant guide sleeve head is larger than the diameter of the fastening head, the diameter of the wear-resistant guide sleeve head is smaller than the diameter of the upper straight hole of the step, the diameter of the wear-resistant guide sleeve head is larger than the diameter of the lower straight hole of the step, the wear-resistant guide sleeve head is located in the upper straight hole of the step, and the wear-resistant guide sleeve rod passes through the lower straight hole of the step.

[0008] As a preferred embodiment, a ejector pin and a second spring are provided on the ejector plate. A stepped hole is formed on the ejector plate, which includes an upper part and a lower part. The upper part of the stepped hole is threaded, and the diameter of the upper part of the stepped hole is larger than the diameter of the lower part of the stepped hole. The ejector pin passes through the stepped hole, and the head size of the ejector pin is larger than that of the lower part of the stepped hole. The second spring is located in the upper part of the stepped hole. The second spring is compressed between the headless screw and the ejector pin by screwing a headless screw into the upper part of the stepped hole. The ejector pin protrudes from the ejector plate. During stamping, the ejector pin extends into the ejector plate.

[0009] As a preferred embodiment, the upper die holder includes an upper die plate, an upper backing plate, and a fixed die plate, which are detachably and fixedly connected from top to bottom. The upper die plate is detachably and fixedly installed on the punch of the stamping machine, and the punch head is detachably and fixedly installed on the upper backing plate. The punch head can pass through the fixed die plate and the ejector plate. Multiple countersunk holes are opened on the upper surface of the ejector plate, and through holes are opened on the upper backing plate and the fixed die plate at the corresponding countersunk hole positions. The top surface of the first spring passing through the through hole abuts against the bottom surface of the upper die plate, and the bottom surface is located inside the countersunk hole.

[0010] As a preferred embodiment, both the fixed template and the ejector plate are provided with punch receiving grooves, threaded holes are provided on the fixed template, grooves are provided below the fixed template, punch fixing blocks are provided on the bottom surface of the fixed template, and punch fixing block clearance grooves are provided on the ejector plate corresponding to the position of the punch fixing block.

[0011] As a preferred embodiment, the progressive die also includes guide pillars and guide sleeves. The guide pillars are fixedly connected to the upper backing plate, pass through the fixed platen and the ejector plate, and extend out of the ejector plate at their lower ends. The guide sleeves are fixedly connected to the concave platen, and the lower ends of the guide pillars can be guided into the guide sleeves. The upper die assembly and the lower die assembly are positioned and guided by the guide pillars and guide sleeves.

[0012] As a preferred embodiment, the lower mold base includes a base plate, support strips, a lower template, and a lower pad plate, which are fixedly connected from bottom to top by bolts. The lower pad plate is fixedly connected to the concave template by bolts. There are three support strips, which are arranged at intervals along the length of the steel strip. The support strips are staggered from the blanking holes. Blanking holes are provided in the base plate, the lower template, and the lower pad plate.

[0013] This utility model has the following advantages: 1. This utility model detachably fixes the punch to the upper die holder by creating a fixing groove on the side of the punch head and using a punch fixing block and bolt structure. This allows for punch head replacement or repair without removing the upper die holder, simply by loosening the bolts and removing the punch fixing block. This design significantly simplifies maintenance procedures, saves downtime, and improves production efficiency.

[0014] 2. This utility model, by setting a sliding support guide structure consisting of a stepped through hole, fasteners, and a first spring between the upper die holder and the ejector plate, allows the ejector plate to move independently relative to the upper die holder during the stamping process: during stamping, the upper die holder moves downward, driving the punch to complete the stamping; during the return stroke, under the restoring force of the first spring, the ejector plate actively pushes the formed workpiece downward, disengaging it from the punch and die. The cooperation between the stepped through hole and the fastener not only limits the relative position of the ejector plate and the upper die holder but also allows it to slide smoothly within a set stroke, balancing structural rigidity and ejection flexibility, reducing the risk of die jamming or part damage, and improving the efficiency and yield of continuous stamping production. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is the front view of the mold of this utility model.

[0017] Figure 2 for Figure 1 Enlarged view of point A.

[0018] Figure 3 This is a schematic diagram of the mold of this utility model.

[0019] Figure 4 This is a schematic diagram of the structure for mounting the punch head on the upper die holder.

[0020] Figure 5 This is a schematic diagram of the lower mold assembly.

[0021] The components are as follows: 1. Upper mold assembly; 2. Lower mold assembly; 3. Upper mold base; 4. Ejector plate; 5. Fastener; 6. First spring; 7. Lower mold base; 8. Concave mold plate; 9. Steel strip; 10. Punch head; 11. Guide sleeve; 12. Punch fixing block; 13. Groove; 14. Threaded hole; 15. Wear-resistant guide sleeve; 16. Guide post; 17. Stepped through hole; 18. Mounting hole; 19. Stepped upper straight hole; 20. Stepped lower straight hole; 21. Fastening head; 22. Fastening rod; 23. Wear-resistant guide sleeve head; 24. Wear-resistant guide sleeve rod; 25. Ejector spring pin; 26. Second spring; 27. Stepped hole; 28. Upper mold plate; 29. ​​Upper pad plate; 30. Fixed mold plate; 31. Base plate; 32. Support strip; 33. Lower mold plate; 34. Lower pad plate; 35. Drop hole. Detailed Implementation

[0022] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] like Figures 1 to 5As shown, a mold includes an upper mold assembly 1 and a lower mold assembly 2. The upper mold assembly 1 includes an upper mold base 3, a stripper plate 4, fasteners 5, and first springs 6. The stripper plate 4 is disposed below the upper mold base 3. A plurality of first springs 6 are arranged in a matrix between the upper mold base 3 and the stripper plate 4. The upper mold base 3 is bolted to the punch of a stamping machine. In this embodiment, the preferred stamping machine is an existing open-type fixed-table pneumatic punch press, model JH21-45. The lower die assembly 2 includes a lower die base 7 bolted to the worktable of the stamping machine and a concave die plate 8 bolted to the lower die base 7. The steel strip 9 to be stamped is located between the ejector plate 4 and the concave die plate 8. A punch head 10 is provided on the upper die base 3, which can pass through the ejector plate 4. A corresponding die is provided on the concave die plate 8. The upper die assembly 1 also includes a punch fixing block 12. A groove 13 is opened on the side of the punch head 10, and the punch fixing block 12 is inserted into the groove 13. A threaded hole 14 is opened on the upper die base 3. The punch head 10 is fixed on the upper die base 3 by bolts passing through the punch fixing block and screwing into the threaded hole 14. The punch head 10 can be replaced or repaired without removing the upper die base 3, simply by loosening the bolts and removing the punch fixing block 12. This design greatly simplifies the maintenance operation process, saves downtime, and improves production efficiency.

[0024] In some embodiments, the upper mold assembly 1 further includes a fastener 5, the upper mold base 3 has a stepped through hole 17, the ejector plate 4 has a mounting hole 18 corresponding to the stepped through hole 17, the fastener 5 passes through the stepped through hole 17 from top to bottom and is detachably fixedly connected to the mounting hole 18, the fastener 5 and the upper mold base 3 can slide relative to each other; the wear-resistant guide sleeve 15 is disposed between the stepped through hole 17 and the fastener 5. More specifically, the stepped through hole 17 includes an upper stepped straight hole 19 and a lower stepped straight hole 20. The diameter of the upper stepped straight hole 19 is larger than the diameter of the lower stepped straight hole 20. The fastener 5 includes a fastening head 21 and a fastening rod 22 fixed to the fastening head 21. The diameter of the fastening head 21 is larger than the diameter of the fastening rod 22. The diameter of the fastening head 21 is larger than the diameter of the lower stepped straight hole 20. The fastener 5 passes through the stepped through hole 17. The lower part of the fastening rod 22 is detachably fixed to the mounting hole 18. The fastening head 21 is located in the upper stepped straight hole 19, so that the ejector plate 4 is always positioned below the upper mold base 3. The length of the part of the fastening rod 22 above the mounting hole 18 is greater than the length of the lower stepped straight hole 20, ensuring that the fastening rod 22 and the lower stepped straight hole 20 can slide relative to each other, so that the upper mold base 3 and the ejector plate 4 can slide relative to each other up and down.

[0025] When the press is not pressing, the ejector plate 4 and the die plate 8 are at a certain distance. In this embodiment, the distance is preferably 8cm to 12cm. At this time, the first spring 6 is in an uncompressed state. The ejector plate 4 is supported by the fastener 5. The ejector plate 4 is 5mm to 10mm away from the upper die base 3. When pressing, the press drives the upper die assembly 1 to contact the lower die assembly 2 and presses it downward. When pressing, the upper die base 3 moves downward relative to the fastener 5, the first spring 6 is compressed, and the upper die base 3 drives the punch head 10 to cooperate with the die for die cutting. Then the press drives the upper die assembly 1 to move upward. Under the elastic force of the first spring 6, the ejector plate 4 moves downward, separating the punch head 10 from the steel strip 9 and also from the die. At this time, the steel strip 9 continues to feed forward and the continuous stamping die is repeated.

[0026] In some embodiments, the upper mold assembly 1 further includes a wear-resistant guide sleeve 15, which passes through the stepped through hole 17. A guide hole extending from top to bottom is opened in the middle of the wear-resistant guide sleeve, and a fastening rod 22 passes through the guide hole. The wear-resistant guide sleeve 15 includes a wear-resistant guide sleeve head 23 and a wear-resistant guide sleeve rod 24 fixedly connected to the wear-resistant guide sleeve head 23. The diameter of the wear-resistant guide sleeve head 23 is larger than the diameter of the fastening head 21, smaller than the diameter of the upper straight hole 19 of the stepped structure, and larger than the diameter of the lower straight hole 20 of the stepped structure. The wear-resistant guide sleeve head 23 is located in the upper straight hole 19 of the stepped structure, and the wear-resistant guide sleeve rod 24 passes through the lower straight hole 20 of the stepped structure, so that the wear-resistant guide sleeve 15 is located between the fastening head 21 and the ejector plate 4, ensuring that the wear-resistant guide sleeve 15 and the lower straight hole 20 of the stepped structure can slide relative to each other. Because the fastening rod 22 needs to slide frequently relative to the stepped lower straight hole 20 during the stamping process, if it directly contacts the metal wall of the stepped through hole 17, friction can easily cause wear of the hole wall and increase the clearance, which in turn can cause the ejector plate 4 to wobble or deviate, affecting the accuracy and life of the mold. This solution introduces an independent wear-resistant guide sleeve, which transforms the metal-to-metal sliding friction between the fastening rod 22 and the stepped through hole 17 into friction between the fastening rod 22 and the wear-resistant guide sleeve 15. At the same time, the wear-resistant guide sleeve 15 itself also forms a controlled sliding pair with the stepped through hole 17, which significantly reduces the wear rate of key mating parts.

[0027] In some embodiments, a ejector pin 25 and a second spring 26 are provided on the ejector plate 4. A stepped hole 27 is formed on the ejector plate 4, comprising an upper part and a lower part. The upper part of the stepped hole is threaded, and its diameter is larger than that of the lower part. The ejector pin 25 passes through the stepped hole 27, with its head larger than the lower part of the stepped hole. The second spring 26 is located at the upper part of the stepped hole. A headless bolt is screwed into the upper part of the stepped hole, compressing the second spring 26 between the headless bolt and the ejector pin 25. The ejector pin 25 protrudes from the ejector plate 4. During stamping, the ejector pin 25 extends into the ejector plate 4. The ejector pin 25 is limited to the lower part of the stepped hole by its head, and the second spring 26 is compressed between the headless bolt and the ejector pin 25, causing the ejector pin 25 to protrude from the bottom surface of the ejector plate 4 in its normal state. During the stamping process, when the ejector plate 4 descends and contacts the steel strip 9, the ejector pin 25 is compressed back into the stepped hole 27. When the stamping is completed and the upper die assembly 1 returns, the second spring 26 releases its elastic force to push the ejector pin 25 out again, actively pushing the steel strip 9 or the formed part to assist it in detaching from the surface of the die plate 8. By adding an independently controllable ejector pin 25 at key stations, localized and precise ejection is achieved, significantly improving the reliability of demolding and the smoothness of feeding.

[0028] In some embodiments, positioning blocks are respectively provided on both sides of the concave template 8 corresponding to the steel strip 9 to provide lateral positioning and guidance for the steel strip 9, ensuring that the feeding direction of the steel strip 9 is accurate and stable.

[0029] In some embodiments, the upper die base 3 includes an upper template 28, an upper backing plate 29, and a fixed template 30, which are detachably and fixedly connected from top to bottom by bolts. The upper template 28 is detachably and fixedly mounted on the punch of the stamping machine, and the punch head 10 is detachably and fixedly mounted on the upper backing plate 29. The punch head 10 can pass through the fixed template 30 and the ejector plate 4. The upper surface of the ejector plate 4 has multiple countersunk holes, and the upper backing plate 29 and the fixed template 30 have through holes corresponding to the countersunk hole positions. The top surface of the first spring 6 passing through the through hole abuts against the bottom surface of the upper template 28, and the bottom surface is located inside the countersunk hole, thereby achieving elastic support for the ejector plate 4. More specifically, the stepped upper straight hole 19 is opened on the upper template 28, and the stepped lower straight hole 20 is opened on the upper backing plate 29 and the fixed template 30 respectively. The stepped through holes 17 are distributed on different layers, which not only meets the assembly space requirements of the fastener 5 and the guide sleeve, but also simplifies the processing difficulty of individual parts and improves manufacturing accuracy and assembly efficiency.

[0030] In some embodiments, the lower die base 7 includes a base plate 31, support bars 32, a lower template 33, and a lower pad 34, which are bolted together sequentially from bottom to top. The lower pad 34 is bolted to the concave template 8. There are three support bars 32, which are spaced apart along the length of the steel strip 9. The support bars 32 are staggered from the blanking holes 35. The base plate 31, the lower template 33, and the lower pad 34 all have blanking holes 35, from which scrap material falls and is discharged. The support bars 32 are positioned to avoid the area of ​​the blanking holes 35. After punching, the scrap material can pass freely through the blanking holes 35 of the lower pad 34, the lower template 33, and the base plate 31 in the vertical direction without obstruction, reducing the frequency of manual scrap removal and reducing unplanned downtime caused by scrap blockage.

[0031] In some embodiments, the continuous die also includes a guide post 16 and a guide sleeve 11. The guide post 16 is fixedly connected to the upper pad 29. The guide post 16 passes through the fixed template 30 and the ejector plate 4 and its lower end extends out of the ejector plate 4. The guide sleeve 11 is fixedly connected to the concave template 8. The lower end of the guide post 16 can be guided to extend into the guide sleeve 11. The upper die assembly 1 and the lower die assembly 2 are positioned and guided by the guide post 16 and the guide sleeve 11.

[0032] During mold production, the steel strip 9 is placed between the ejector plate 4 and the die plate 8, and is continuously fed by the feeding mechanism at a set step distance. The upper mold assembly 1 descends, the ejector plate 4 first contacts the steel strip 9 and temporarily stops descending, while the upper mold base 3 continues to descend, compressing the first spring 6, causing the punch head 10 to pass through the ejector plate 4 and engage with the die on the die plate 8. The punch head 10 engages with the die to complete the stamping forming action of the workpiece. Simultaneously, the guide post 16 inserts into the guide sleeve 11 to ensure precise alignment of the upper and lower molds. After stamping, the upper mold assembly 1 rises with the return stroke of the press, the first spring 6 pushes the ejector plate 4 away from the upper mold base 3 to reset, and the ejector pin 25 extends under the action of the second spring 26, actively pushing the steel strip 9 or the formed part away from the die, achieving reliable demolding. The waste generated during stamping automatically falls out through the discharge hole 35; subsequently, the steel strip 9 is fed forward, preparing for the next stamping cycle.

[0033] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A mold, characterized in that: The assembly includes an upper die assembly and a lower die assembly. The upper die assembly includes an upper die base, a stripper plate, and a first spring. The stripper plate is located below the upper die base, and a matrix of multiple first springs is located between the upper die base and the stripper plate. The upper die base is mounted on the punch of a stamping machine. The lower die assembly includes a lower die base mounted on the worktable of the stamping machine and a die plate fixed on the lower die base. A punch head is provided on the upper die base, which can pass through the stripper plate. A die is correspondingly provided on the die plate. The upper die assembly also includes a punch fixing block. A groove is opened on the side of the punch head, and the punch fixing block is inserted into the groove. A threaded hole is opened on the upper die base. A bolt passes through the punch positioning block and is screwed into the threaded hole to fix the punch head on the upper die base. The upper mold assembly also includes a wear-resistant guide sleeve and fasteners. The upper mold base has a stepped through hole, and the ejector plate has a mounting hole at the corresponding position of the stepped through hole. The fasteners pass through the stepped through hole from top to bottom and are detachably and fixedly connected to the mounting hole. The fasteners and the upper mold base can slide relative to each other. The wear-resistant guide sleeve is set between the stepped through hole and the fasteners.

2. The mold according to claim 1, characterized in that: The stepped through hole includes an upper stepped straight hole and a lower stepped straight hole. The diameter of the upper stepped straight hole is larger than the diameter of the lower stepped straight hole. The fastener includes a fastening head and a fastening rod fixed to the fastening head. The diameter of the fastening head is larger than the diameter of the lower stepped straight hole. The fastener passes through the stepped through hole. The lower part of the fastening rod is detachably fixed to the mounting hole. The fastening head is located in the upper stepped straight hole. The diameter of the fastening head is larger than the diameter of the fastening rod. The fastening rod and the lower stepped straight hole can slide relative to each other. The upper mold assembly also includes a wear-resistant guide sleeve. The wear-resistant guide sleeve passes through the stepped through hole. A guide hole running from top to bottom is opened in the middle of the wear-resistant guide sleeve. The fastening rod passes through the guide hole, so that the wear-resistant guide sleeve is located between the fastening head and the ejector plate. The wear-resistant guide sleeve and the lower stepped straight hole can slide relative to each other.

3. The mold according to claim 2, characterized in that: The wear-resistant guide sleeve includes a wear-resistant guide sleeve head and a wear-resistant guide sleeve rod fixedly connected to the wear-resistant guide sleeve head. The diameter of the wear-resistant guide sleeve head is larger than the diameter of the fastening head. The diameter of the wear-resistant guide sleeve head is smaller than the diameter of the upper straight hole of the step. The diameter of the wear-resistant guide sleeve head is larger than the diameter of the lower straight hole of the step. The wear-resistant guide sleeve head is located in the upper straight hole of the step, and the wear-resistant guide sleeve rod passes through the lower straight hole of the step.

4. The mold according to claim 1, characterized in that: A ejector pin and a second spring are provided on the ejector plate. A stepped hole is formed on the ejector plate, which includes an upper part and a lower part. The upper part of the stepped hole is threaded, and the diameter of the upper part of the stepped hole is larger than the diameter of the lower part of the stepped hole. The ejector pin passes through the stepped hole, and the head size of the ejector pin is larger than that of the lower part of the stepped hole. The second spring is located in the upper part of the stepped hole. The second spring is compressed between the headless screw and the ejector pin by screwing a headless screw into the upper part of the stepped hole. The ejector pin protrudes from the ejector plate. During stamping, the ejector pin extends into the ejector plate.

5. A mold according to claim 1, characterized in that: The upper die base includes an upper die plate, an upper backing plate, and a fixed die plate, which are detachably and fixedly connected from top to bottom. The upper die plate is detachably and fixedly installed on the punch of the stamping machine, and the punch head is detachably and fixedly installed on the upper backing plate. The punch head can pass through the fixed die plate and the ejector plate. Multiple countersunk holes are opened on the upper surface of the ejector plate. Through holes are opened on the upper backing plate and the fixed die plate at the corresponding countersunk hole positions. The top surface of the first spring passing through the through hole abuts against the bottom surface of the upper die plate, and the bottom surface is located in the countersunk hole.

6. A mold according to claim 5, characterized in that: Both the fixed template and the ejector plate have punch receiving grooves. Threaded holes are set on the fixed template, and grooves are set below the fixed template. The punch fixing block is set on the bottom surface of the fixed template, and the ejector plate has punch fixing block clearance grooves corresponding to the punch fixing block positions.

7. A mold according to claim 5, characterized in that: The progressive die also includes guide pillars and guide sleeves. The guide pillars are fixedly connected to the upper backing plate. The guide pillars pass through the fixed platen and the ejector plate, and the lower end extends out of the ejector plate. The guide sleeves are fixedly connected to the concave platen. The lower end of the guide pillars can be guided to extend into the guide sleeves. The upper die assembly and the lower die assembly are positioned and guided by the guide pillars and guide sleeves.

8. A mold according to claim 5, characterized in that: The lower mold base includes a base plate, support strips, lower template, and lower pad plate, which are fixedly connected by bolts from bottom to top. The lower pad plate is fixedly connected to the concave template by bolts. There are three support strips, which are arranged at intervals along the length of the steel strip. The support strips are staggered from the blanking holes. Blanking holes are provided in the base plate, lower template, and lower pad plate.

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