A punching and flanging die for automobile seat back side panels and a processing method thereof

Abstract

The present invention discloses a die for punching and flanging automobile seat backrest side panels and a processing method thereof, comprising a die for punching and flanging automobile seat backrest side panels and a processing method thereof, comprising a die for punching and flanging automobile seat backrest side panels and a processing method thereof, wherein the die for punching and flanging automobile seat backrest side panels comprise a die for punching and flanging automobile seat backrest side panels ...

Description

Technical Field

[0001] The invention relates to the field of punching and flanging dies for automobile seat back side panels. Background Art

[0002] In the process of processing and producing the side panels of automobile seat backrests, multiple steps of processing need to be carried out through multiple molds. Among them, when using a punching mold to cut the waste edge of the sheet, punching needs to be performed at multiple positions, and the punching degree is also different. The edge of the sheet after punching needs to be flanging processed by a flanging mold. After the existing punching and flanging mold performs the trimming process, the flanging position is easily misaligned during the flanging process, which is not convenient for installation. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a punching and flanging die for the side panels of a car seat backrest and a processing method thereof. The waste edge of the sheet is first cut off by the cutting ring on the punching die, and then the cutting position is flanging processed by the flanging die so that the processed side panel of the backrest can be adapted for installation.

[0004] Technical solution: To achieve the above purpose, the technical solution of the present invention is as follows:

[0005] The punching and flanging die of the side panel of the car seat back includes a punching die and a flanging die. The punching die includes a relatively matched splicing die and a mosaic convex die. Several punching blocks surrounding the edge of the splicing die are spliced ​​to form a trimming annular body. Several waste cutting blocks are arranged around the edge of the mosaic convex die. Several of the waste cutting blocks are arranged at circumferential intervals; the several waste cutting blocks are arranged corresponding to the trimming annular body; the flanging die includes a flanging lower convex die and a flanging upper die. Multiple concave and convex blocks are arranged and spliced ​​to form the flanging upper die. The flanging upper die is relatively mosaic-arranged with the flanging lower convex die.

[0006] Furthermore, the splicing die is arranged in the middle of the upper pad, the splicing die is concave from the middle to one end, and the width of the concave end of the splicing die is gradually reduced; the splicing die is located in the middle of several punching blocks, and several of the punching blocks are adapted to the height setting of the corresponding parts of the splicing die, several of the punching block surfaces are flush with the corresponding positions of the splicing die edges, and the inner edge of the trimming ring body is concave and convex.

[0007] Furthermore, the punching block includes a first punching block, a second punching block, a third punching block, a fourth punching block, a fifth punching block, a sixth punching block and a seventh punching block arranged in a clockwise circumferential direction, and the first punching block and the second punching block are located on both sides of the splicing die relative to the fifth punching block and the sixth punching block; the third punching block and the fourth punching block are located at both ends of the splicing die relative to the seventh punching block; the inner edge formed by the splicing of the first punching block and the second punching block is gradually concave; the inner edge of the seventh punching block is semicircular.

[0008] Furthermore, the third punching block and the fourth punching block are located at the corresponding concave end positions of the die; the inner edges of the third punching block and the fourth punching block are at right angles, and the third punching block and the fourth punching block are relatively spliced ​​to form a rectangular end, and the inner edge of the rectangular end is provided with a tooth mouth; the inner wall of the fourth punching block away from the end of the third punching block is set at a distance from the edge of the splicing die; the inner edges of the fifth and sixth punching blocks are set at a distance from the edge of the splicing die, a protruding strip is provided in the middle of the inner edge of the fifth punching block, and a protruding strip is provided on the inner edge of the sixth punching block away from the end of the fifth punching block; the protruding strip is correspondingly spliced ​​with the seventh punching block; the inner edges of the fifth and sixth punching blocks form concave and convex inner edges with the protruding strip and the protruding strip, and the concave and convex inner edges are set at a distance from the edge of the splicing die.

[0009] Furthermore, the surface of the interlocking punch is adapted to the inner wall setting of the splicing die; the edge of the interlocking punch is adapted to the inner edge setting of the trimming ring, and the concave and convex edge grooves of the interlocking punch correspond to the concave and convex inner edge settings; the interlocking punch is arranged in the middle of the lower fixed plate, and a plurality of waste cutting blocks are arranged on the edge of the interlocking punch on the lower fixed plate, and the waste cutting blocks include a base and a cutting strip; the cutting strip is fixed to the lower fixed plate through the base, and the cross-section of the cutting strip away from the base is conical; several of the cutting strips are respectively perpendicular to the edge of the interlocking punch; several of the cutting strips are arranged relative to the trimming ring, and the cutting edges of the cutting strips are in contact with the surface of the trimming ring.

[0010] Furthermore, the sheet structure after trimming is correspondingly arranged on the lower flanging punch, and the upper flanging die cooperates with the lower flanging punch to flanging the edge of the sheet structure; one end of the lower flanging punch is collapsed, and the lower flanging punch is arranged on the lower fixed plate of the flanging through a rectangular spring; the lower fixed plate of the flanging is arranged on the lower bottom plate of the flanging through the lower die foot; the upper flanging die is arranged on the upper pad of the flanging through a rectangular spring, and the lower fixed plate of the flanging is provided with guide blocks, and multiple guide blocks are located at both ends of the lower flanging punch; the two ends of the upper flanging die are provided with matching slots corresponding to the guide blocks; the guide column on the lower fixed plate of the flanging is matched with the guide sleeve on the upper pad of the flanging.

[0011] Furthermore, the concave-convex block includes a first block, a second block and a third block that are spliced ​​together in sequence, a first notch is opened in the middle of the first block; a second notch is opened in the middle of the second block; a third notch is opened in the middle of the third block; the first notch, the second notch and the third notch are spliced ​​together in sequence to form the upper die of the flanging, and the widths of the first notch, the second notch and the third notch increase in sequence, and the third notch is closed at one end away from the second notch.

[0012] Furthermore, a plurality of pressing protrusions are arranged inside the upper die of the flanging, and the plurality of pressing protrusions are arranged along the length direction of the upper die of the flanging; the push rod on the upper pad of the flanging is drive-connected to the pressing protrusions; an end pressing block is provided on the upper pad of the flanging, and the end pressing block is located at the opening of the first slot.

[0013] Furthermore, the processing method is:

[0014] The first step: during the punching process, the splicing die and the engaging punch cooperate with each other to punch the sheet, and the waste material at the edge of the punched sheet can be cut into multiple strips by the waste cutting block;

[0015] The second step: a trimming ring is formed by splicing multiple punching blocks, which can adapt to the shape of the inner edge of the trimming ring. When punching, it can directly cooperate with the edge of the embedded punch to cut off the waste edge of the sheet, and then be divided into multiple strips by the waste cutting block;

[0016] The third step: the sheet after trimming is placed on the lower flange punch, and then the lower flange punch and the upper flange die cooperate with each other to punch and bend the edge of the sheet to form a flange.

[0017] Beneficial effects: In the present invention, the edge position of the splicing die is a trimming ring-shaped body. When punching, the trimming ring-shaped body can cooperate with the edge of the engaging punch to cut off the waste at the edge position of the sheet. It is set in a ring shape, and the trimming process can be performed as a whole at one time, and the punching is completed quickly; the waste edge after punching is annular, and the provided waste cutting block can correspondingly cut the annular waste edge into multiple segments, which can facilitate the timely separation and falling of the waste edge, and also facilitate the processing of the cut waste edge, and facilitate collection; then the edge position of the sheet after trimming is flanging processed by the flanging lower punch and the flanging upper die, and the provided flanging upper die is spliced ​​by a plurality of concave and convex blocks, so that the edge of the flanging upper die can be adjusted so that the edge of the flanging upper die can adapt to the edge of the sheet, which is convenient for the corresponding flanging process and is conducive to the adaptation and installation of the processed backrest side panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attachment Figure 1 It is the structural diagram of the interlocking punch;

[0019] Attachment Figure 2This is the structural diagram of the splicing die;

[0020] Attachment Figure 3 This is the structure diagram of the punching die;

[0021] Attachment Figure 4 This is the structural diagram of the punching block;

[0022] Attachment Figure 5 This is the structural diagram of the waste block;

[0023] Attachment Figure 6 This is the structural diagram of the upper die of the flanging;

[0024] Attachment Figure 7 This is the structure diagram of the flanging die;

[0025] Attachment Figure 8 This is the structural diagram of the flanging lower punch. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] As attached Figure 1-8 : The punching and flanging die of the side panel of the car seat back includes a punching die 1 and a flanging die 4. The punching die 1 includes a relatively matched splicing die 2 and a mosaic convex die 3. Several punching blocks 21 around the edge of the splicing die 2 are spliced ​​to form a trimming annular body 22. Several waste blocks 31 are arranged around the edge of the mosaic convex die 3. Several waste blocks 31 are arranged at circumferential intervals; the several waste blocks 31 are arranged corresponding to the trimming annular body 22; the flanging die 4 includes a flanging lower punch 5 and a flanging upper die 6. Multiple concave and convex blocks 61 are arranged and spliced ​​to form the flanging upper die 6. The flanging upper die 6 is relatively mosaicked with the flanging lower punch 5. The edge position of the splicing die is a trimming ring. When punching, the trimming ring can cooperate with the edge of the engaging punch to cut off the waste at the edge position of the sheet. It is set in a ring shape, and the trimming process can be performed as a whole at one time, and the punching is completed quickly; the waste edge after punching is annular, and the provided waste cutting block can correspondingly cut the annular waste edge into multiple segments, which can facilitate the timely separation and falling of the waste edge, and also facilitate the processing of the cut waste edge and facilitate collection; then the edge position of the sheet after trimming is flanging by the flanging lower punch and the flanging upper die, and the provided flanging upper die is spliced ​​by a plurality of concave and convex blocks, so that the edge of the flanging upper die can be adjusted so that the edge of the flanging upper die can adapt to the edge of the sheet, which is convenient for the corresponding flanging process and is conducive to the adaptation and installation of the processed backrest side panels.

[0028] The splicing die 2 is set in the middle of the upper pad. The splicing die 2 is concave from the middle to one end, and the width of the concave end of the splicing die 2 is gradually reduced. The splicing die 2 is located in the middle of several punching blocks 21, and several of the punching blocks 21 are adjusted to the height of the corresponding parts of the splicing die 2. The surfaces of several punching blocks 21 are flush with the corresponding positions of the edges of the splicing die 2. The inner edge of the trimming ring 22 is concave and convex. The shape of the inner edge of the trimming ring can be adjusted accordingly by adjusting and replacing the punching blocks, and thus the shape of the edge of the punched sheet can be adjusted accordingly, improving the applicability.

[0029] The punching block 21 includes a first punching block 211, a second punching block 212, a third punching block 213, a fourth punching block 214, a fifth punching block 215, a sixth punching block 216, and a seventh punching block 217, which are arranged in a clockwise circumferential manner. The first punching block 211 and the second punching block 212 are located on both sides of the splicing die 2 relative to the fifth punching block 215 and the sixth punching block 216; the third punching block 213 and the fourth punching block 214 are located at both ends of the splicing die 21 relative to the seventh punching block 217; the inner edge formed by the splicing of the first punching block 211 and the second punching block 212 is gradually concave; the inner edge of the seventh punching block 217 is semicircular. The plurality of punching blocks are arranged in a circumferential manner to form a circular track shape. When punching, the required shape can be punched out accordingly, which facilitates the corresponding punching of the edge of the sheet.

[0030] The third punching block 213 and the fourth punching block 214 are located at the concave end of the corresponding die 2; the inner edges of the third punching block 213 and the fourth punching block 214 are at right angles, and the third punching block 213 and the fourth punching block 214 are relatively spliced ​​to form a rectangular end 218, and the inner edge of the rectangular end 218 is provided with a tooth mouth 219; the inner wall of the end of the fourth punching block 214 away from the third punching block 213 is set at a distance from the edge of the splicing die 2; the inner edges of the fifth punching block 215 and the sixth punching block 216 are set at a distance from the edge of the splicing die 2, and the inner edge of the fifth punching block 215 is set A protruding strip 23 is provided in the middle part, and a protruding strip 231 is provided on the inner edge of the end of the sixth punching block 216 away from the fifth punching block 215; the protruding strip 231 is correspondingly spliced ​​with the seventh punching block 217; the inner edges of the fifth punching block 215 and the sixth punching block 216 form a concave-convex inner edge 232 with the protruding strip 23 and the protruding strip 23, and the concave-convex inner edge 232 is set at a distance from the edge of the splicing die 2; the shape of the inner edge of the adjusting cutting ring body can be adjusted by setting a punching block of corresponding shape, so that the punching of corresponding shape can be performed, which is convenient for adjustment and increases the scope of application.

[0031] The surface of the interlocking punch 3 is adapted to the inner wall setting of the splicing die 2; the edge of the interlocking punch 3 is adapted to the inner edge setting of the trimming annular body 22, and the concave-convex edge groove 32 of the interlocking punch 3 is arranged corresponding to the concave-convex inner edge 232; the interlocking punch 3 is arranged in the middle of the upper fixed plate, and a plurality of waste cutting blocks 31 are arranged on the edge of the interlocking punch 3 on the upper fixed plate, and the waste cutting blocks 31 include a base 311 and a cutting strip 312; the cutting strip 312 is fixed to the upper fixed plate through the base 311, and the cross-section of the cutting strip 312 at one end away from the base 311 is conical; several of the cutting strips 312 are respectively perpendicular to the edge of the interlocking punch 3; several of the cutting strips 312 are arranged relative to the trimming annular body 22, and the cutting edge of the cutting strip 312 is in contact with the surface of the trimming annular body 22. The shape of the inner edge of the trimming ring can be adjusted accordingly according to the edge of the engaging punch, so that a corresponding shape can be punched out at the edge of the sheet during the matching punching. When the trimming ring punches out the waste edge of the sheet, the cutting strips on the waste cutting block can divide the annular waste edge into multiple sections, thereby facilitating the processing and collection of the cut waste edge.

[0032] The sheet structure after trimming is correspondingly arranged on the flanging lower punch 5, and the flanging upper die 6 cooperates with the flanging lower punch 5 to flanging the edge of the sheet structure; one end of the flanging lower punch 5 is collapsed, and the flanging lower punch 5 is arranged on the flanging lower fixed plate 51 through a rectangular spring; the flanging lower fixed plate 51 is arranged on the flanging lower bottom plate 53 through the lower die foot 52; the flanging upper die 6 is arranged on the flanging upper pad 67 through a rectangular spring, and a guide block 54 is provided on the flanging lower fixed plate 51, and multiple guide blocks 54 are located at both ends of the flanging lower punch 5; matching slots 62 corresponding to the guide blocks 54 are opened at both ends of the flanging upper die 6; the guide column 55 on the flanging lower fixed plate 51 is matched with the guide sleeve on the flanging upper pad 67. When the lower flanging punch and the upper flanging die cooperate with each other to perform flanging on the edge of the sheet structure, the corresponding cooperation of the guide column and the guide sleeve can provide guidance. At the same time, the guide block can also play a guiding and limiting role, which can limit the sheet structure on the lower flanging punch from both sides, avoiding the movement of the sheet structure during the stamping and flanging process, and avoiding the dislocation of the flanging position.

[0033] The concave-convex block 61 includes a first block 62, a second block 63, and a third block 64, which are sequentially spliced ​​together. A first notch 621 is defined in the middle of the first block 62; a second notch 631 is defined in the middle of the second block 63; and a third notch 641 is defined in the middle of the third block 64. The first notch 621, the second notch 631, and the third notch 641 are sequentially spliced ​​together to form the upper flanging die 6. The widths of the first notch 621, the second notch 631, and the third notch 641 increase in width, and the third notch 641 is closed at one end away from the second notch 631. The upper flanging die is formed by arranging and splicing the first, second, and third blocks, and the first, second, and third notches are spliced ​​together to form a groove on the upper flanging die. The splicing arrangement of the upper flanging die allows the shape of the groove on the upper flanging die to be adjusted accordingly by replacing the concave-convex blocks at the corresponding positions, making replacement and adjustment easy.

[0034] A plurality of pressing protrusions 65 are provided inside the upper die 6 of the flanging, and the plurality of pressing protrusions 65 are provided along the length direction of the upper die 6 of the flanging; the push rod on the upper pad 67 is drivingly connected to the pressing protrusions 65; the upper pad 67 of the flanging is provided with an end stop 611, and the end stop 611 is located at the opening of the first slot 621; the end stop can be used to stop at one end of the sheet structure to reduce the movement of the sheet during the stamping and flanging.

[0035] The processing method is as follows: First, during the punching process, the splicing die 2 and the engaging convex die 3 cooperate with each other to punch the sheet, and the waste material at the edge of the punched sheet can be cut into multiple strips by the waste cutting block 31; the sheet edge is punched by the annular cutting ring, and then the punched waste edge can be correspondingly divided into multiple strips by the waste cutting block for easy collection and processing;

[0036] The trimming annular body 22 is formed by splicing together a plurality of punching blocks 21. The shape of the inner edge of the trimming annular body 22 can be adjusted. During punching, the edge of the trimming annular body 22 can be directly cooperated with the edge of the engaging punch 3 to cut off the waste edge of the sheet, and then the sheet is divided into multiple strips by the waste cutting block 31. The trimming annular body is formed by splicing together a plurality of punching blocks. The shape of the inner edge of the trimming annular body can be adjusted by adjusting or replacing the punching blocks, thereby adjusting the shape of the edge of the punched sheet accordingly.

[0037] The second step: the sheet after trimming is set on the lower flanging punch 5, and then the lower flanging punch 5 and the upper flanging die 6 cooperate with each other to punch and bend the edge of the sheet to form a flanging; the lower flanging punch and the upper flanging die are used to perform flanging processing on the edge of the sheet structure after punching to ensure that the flanging position can be accurately flanging processed, reduce the flanging misalignment phenomenon, and facilitate the adaptation and installation of the processed backrest side panels.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. A person skilled in the art may make several improvements and changes without departing from the above principles of the present invention, and these improvements and changes are also considered to be within the scope of protection of the present invention.

Claims

1. The die for punching and flanging the side panels of the car seat backrest is characterized by: The invention comprises a punching die (1) and a flanging die (4), wherein the punching die (1) comprises a relatively matched splicing die (2) and a chimeric convex die (3), wherein a plurality of punching blocks (21) surrounding the edge of the splicing die (2) are spliced ​​to form a trimming annular body (22), and a plurality of waste cutting blocks (31) are arranged around the edge of the chimeric convex die (3), wherein the plurality of waste cutting blocks (31) are arranged at an annular spacing; the plurality of waste cutting blocks (31) are arranged corresponding to the trimming annular body (22); the flanging die (4) comprises a flanging lower convex die (5) and a flanging upper die (6), wherein a plurality of concave and convex blocks (61) are arranged and spliced ​​to form a flanging upper die (6), and the flanging upper die (6) is chimerically arranged relative to the flanging lower convex die (5); The splicing die (2) is arranged in the middle of the upper pad, the splicing die (2) is concave from the middle to one end, and the width of the concave end of the splicing die (2) is gradually reduced; the splicing die (2) is located in the middle of a plurality of punching blocks (21), and a plurality of the punching blocks (21) are adapted to the height setting of the corresponding parts of the splicing die (2), the surfaces of a plurality of the punching blocks (21) are flush with the corresponding positions of the edges of the splicing die (2), and the inner edge of the trimming ring body (22) is concave and convex; The punching block (21) comprises a first punching block (211), a second punching block (212), a third punching block (213), a fourth punching block (214), a fifth punching block (215), a sixth punching block (216) and a seventh punching block (217) which are arranged and spliced ​​in a clockwise circumferential direction. The first punching block (211) and the second punching block (212) are located on both sides of the splicing die (2) relative to the fifth punching block (215) and the sixth punching block (216); the third punching block (213) and the fourth punching block (214) are located at both ends of the splicing die (2) relative to the seventh punching block (217); the inner edge formed by the splicing of the first punching block (211) and the second punching block (212) is gradually concave; the inner edge of the seventh punching block (217) is semicircular; The third punching block (213) and the fourth punching block (214) are located at the concave end of the corresponding splicing die (2); the inner edges of the third punching block (213) and the fourth punching block (214) are at right angles, and the third punching block (213) and the fourth punching block (214) are relatively spliced ​​to form a rectangular end (218), and the inner edge of the rectangular end (218) is provided with a tooth opening (219); the inner wall of the end of the fourth punching block (214) away from the third punching block (213) is spaced apart from the edge of the splicing die (2); the fifth punching block (215) and the sixth punching block (216) are spaced apart from each other. The inner edge is spaced apart from the edge of the splicing die (2); a protruding strip (23) is provided at the middle of the inner edge of the fifth punching block (215); a protruding strip (231) is provided on the inner edge of the sixth punching block (216) away from the fifth punching block (215); the protruding strip (231) is correspondingly spliced ​​with the seventh punching block (217); the inner edges of the fifth punching block (215) and the sixth punching block (216) and the protruding strip (23) and the protruding strip (231) form a concave-convex inner edge (232); and the concave-convex inner edge (232) is spaced apart from the edge of the splicing die (2).

2. The die for punching and flanging the side panels of the car seat backrest according to claim 1, characterized in that: The surface of the interlocking convex mold (3) is adapted to the inner wall of the splicing concave mold (2); the edge of the interlocking convex mold (3) is adapted to the inner edge of the trimming annular body (22), and the concave-convex edge groove (32) of the interlocking convex mold (3) is arranged corresponding to the concave-convex inner edge (232); the interlocking convex mold (3) is arranged in the middle of the lower fixed plate, and a plurality of waste cutting blocks (31) are arranged on the edge of the interlocking convex mold (3) on the lower fixed plate, and the waste cutting blocks (31) include a base (311) and a cutting strip (312); the cutting strip (312) is fixed to the lower fixed plate through the base (311), and the cross section of the end of the cutting strip (312) away from the base (311) is tapered; the plurality of cutting strips (312) are respectively perpendicular to the edge of the interlocking convex mold (3); the plurality of cutting strips (312) are arranged relative to the trimming annular body (22), and the cutting edges of the cutting strips (312) are in contact with the surface of the trimming annular body (22).

3. The die for punching and flanging the side panels of the car seat backrest according to claim 2, characterized in that: The sheet structure after trimming is correspondingly arranged on the flanging lower punch (5), and the flanging upper die (6) cooperates with the flanging lower punch (5) to perform flanging processing on the edge of the sheet structure; one end of the flanging lower punch (5) is collapsed, and the flanging lower punch (5) is arranged on the flanging lower fixed plate (51) through a rectangular spring; the flanging lower fixed plate (51) is arranged on the flanging lower bottom plate (53) through a lower die foot (52); the flanging upper die (6) is arranged on the flanging upper pad (67) through a rectangular spring, and a guide block (54) is arranged on the flanging lower fixed plate (51), and a plurality of the guide blocks (54) are located at both ends of the flanging lower punch (5); matching slots corresponding to the guide blocks (54) are opened at both ends of the flanging upper die (6); the guide column (55) on the flanging lower fixed plate (51) is matched with the guide sleeve on the flanging upper pad (67).

4. The die for punching and flanging the side panels of the car seat backrest according to claim 3, characterized in that: The concave-convex block (61) comprises a first block (62), a second block (63) and a third block (64) which are spliced ​​in sequence, wherein a first notch (621) is provided in the middle of the first block (62); a second notch (631) is provided in the middle of the second block (63); and a third notch (641) is provided in the middle of the third block (64); the first notch (621), the second notch (631) and the third notch (641) are spliced ​​in sequence to form the upper die (6) for the flanging, and the widths of the first notch (621), the second notch (631) and the third notch (641) increase in sequence, and the third notch (641) is closed at one end away from the second notch (631).

5. The die for punching and flanging the side panels of the car seat backrest according to claim 4, characterized in that: A plurality of pressing protrusions (65) are provided inside the flanging upper die (6), and the plurality of pressing protrusions (65) are provided along the length direction of the flanging upper die (6); a push rod on the flanging upper pad (67) is drivingly connected to the pressing protrusions (65); an end stop (611) is provided on the flanging upper pad (67), and the end stop (611) is located at the opening of the first notch (621).

6. The method for processing a punching and flanging die for a car seat back side panel according to any one of claims 1 to 5, characterized in that: The processing method is: The first step: during the punching process, the splicing die (2) and the engaging convex die (3) cooperate with each other to punch the sheet, and the waste material at the edge of the punched sheet can be cut into multiple strips by the waste cutting block (31); A trimming ring-shaped body (22) is formed by splicing a plurality of punching blocks (21), and the shape of the inner edge of the trimming ring-shaped body (22) can be adjusted. When punching, the trimming ring-shaped body (22) can directly cooperate with the edge of the engaging punch (3) to cut off the waste material at the edge of the sheet, and then be divided into multiple strips by the waste cutting block (31); The second step: the sheet structure after trimming is arranged on the lower flange punch (5), and then the lower flange punch (5) and the upper flange die (6) cooperate with each other to punch and bend the edge of the sheet structure, thereby forming a flange.

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