Mold for machining left rear mounting plate of left front seat of automobile

Abstract

The application discloses a machining die for a left rear mounting plate of a left front seat of an automobile, which comprises an end portion side punching die and a bottom surface and top surface side punching die. A material sheet is processed by a blanking die, and then is preformed by a forming die. The edge of the preformed material sheet is flanged by a flanging die. Then, the flange on the edge of the preformed material sheet at both ends is punched by the end portion side punching die. Finally, the bottom surface and the top surface of the preformed material sheet are punched by the bottom surface and top surface side punching die. The machining die for the left rear mounting plate of the left front seat of the automobile is provided. The through holes are formed on the flange, the bottom surface and the top surface of the mounting plate by the end portion side punching die and the bottom surface and top surface side punching die, so that the mounting plate is improved in stability after being mounted through the through holes.

Description

Technical Field

[0001] This invention relates to the field of machining molds for the left rear mounting plate of the left front seat of an automobile. Background Technology

[0002] Car seat mounting plates are typically manufactured using processing molds. Mounting plates produced by these molds need to have good stability after installation. However, when punching holes in the mounting plates using existing processing molds, the punching positions on the edges of the mounting plates are offset, making it difficult for the multiple punched holes to fit together. This results in an unstable mounting plate after installation. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a processing mold for the left rear mounting plate of the left front seat of an automobile. Through holes are processed on the flange, bottom and top surfaces of the mounting plate by end side punching mold and bottom and top side punching mold, so as to improve the stability after installation through the through holes.

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

[0005] The processing mold for the left rear mounting plate of the left front seat of an automobile includes an end side punching mold and a bottom and top side punching mold. The material plate is processed into a sheet by a blanking mold. The sheet is pre-formed by a forming mold and then the edge of the pre-formed sheet is flanged by a flanging mold. Then, the end side punching mold punches holes on the flanged edges at both ends of the pre-formed sheet. Finally, the bottom and top sides punch holes on the bottom and top surfaces of the pre-formed sheet.

[0006] Furthermore, the end-side punching die includes a mounting plate, one side of which is provided with a fastening structure for fixing the sheet material on the mounting plate; one end of the mounting plate is provided with an inclined punching die, and the other end of the mounting plate is provided with a curved punching die. The pre-formed sheet material is adapted to be placed on the surface of the mounting plate and pressed down by a pressure plate. The limiting end of the fastening structure is fitted into a groove on one side of the sheet material, and the limiting end of the fastening structure is fixed to the sheet material by bolts; the punch assembly of the inclined punching die at one end moves to punch the flange at one end of the sheet material, and the punch structure of the curved punching die at the other end moves to punch the flange at the other end of the sheet material.

[0007] Furthermore, the fastening structure includes a mating block, a driving cylinder is provided on a fixed seat on one side of the mounting plate, the driving end of the driving cylinder is drivenly connected to one side of the mating block, the other side of the mating block has a protrusion as a mating abutment surface, the mating abutment surface is fitted into the groove, a limiting block is fixed in the middle of the mating abutment surface, the bottom surface of the limiting block fits with the surface of the material sheet, and a protrusion is provided on the mounting plate to cooperate with the limiting block, the limiting block and the protrusion cooperate to clamp the material sheet.

[0008] Furthermore, the inclined punching die includes a push rod, and a drive cylinder on the mounting plate is drivenly connected to the bottom end of the push rod. A punch assembly is inclinedly arranged at the top end of the push rod. The punch assembly includes a punch fixing block, the surface of which is adapted to the flanged sidewall of the sheet material. A plurality of inclined punches are provided on the punch fixing block, and the cross-section of the inclined punches is elliptical. The plurality of inclined punches are arranged at an inclined spacing. A mating pressure block is fixed on the pressure plate. The positions of the plurality of mating pressure blocks are respectively inclinedly arranged to correspond to the positions of the plurality of inclined punches. A through hole corresponding to the inclined punch is opened on the mating pressure block.

[0009] Furthermore, the curved punching die includes a push rod, and the punch structure includes a first mating block and a second mating block. The driving cylinder on the mounting plate is driven and connected to the push rod. The first and second mating blocks are fixed on the push rod on the mounting plate. A first punch is provided on the second mating block, and a second and a third punch are provided on the first mating block. The cross-section of the first, second, and third punches is a rectangle with semicircles at both ends. The first punch is perpendicular to the width direction of the mounting plate, and the second and third punches are inclined to the width direction of the mounting plate, with the inclination of the second punch being greater than that of the third punch. A plurality of corresponding pressure blocks are provided on the pressure plate, and the positions of the plurality of corresponding pressure blocks correspond to the positions of the first, second, and third punches, respectively. The plurality of corresponding pressure blocks are provided with through holes corresponding to the first, second, and third punches, respectively.

[0010] Furthermore, the bottom and top side punching mold includes a fixed support, on which a plurality of protruding inserts are provided. The sheet material is correspondingly clamped on the plurality of protruding inserts, and the surface of the protruding inserts contacts the inner wall of the sheet material. The pressing plate is mounted on the fixed support by a telescopic spring, and the pressing plate is correspondingly pressed on the surface of the sheet material. A plurality of side mounting seats are respectively provided on both sides of the fixed support, and a side punching mold is provided on the plurality of side mounting seats. The plurality of side punching molds are staggered relative to each other, and the plurality of side punching molds punch holes at both ends of the bottom surface and both ends of the top surface of the sheet material respectively.

[0011] Furthermore, the side punching die includes a first punching die, a second punching die, and a third punching die; a plurality of first punching dies are located on one side of the bottom surface of the sheet, and the plurality of first punching dies are arranged in parallel with a spacing between them; the second punching die and the third punching die are located at both ends of the top surface of the sheet, and the second punching die and the third punching die are inclined relative to the length direction of the sheet, adapted to the inclined top surface of the sheet, and the inclination degree of the second punching die and the third punching die is the same.

[0012] Furthermore, the first, second, and third punching dies include drive sliders. A drive cylinder on the side mounting base is driven and connected to one end of the drive slider. A stop block is fixedly mounted on the other end of the drive slider by bolts. The sidewall of the stop block of the first punching die is in contact with the bottom surface of the sheet, and the sidewalls of the stop blocks of the second and third punching dies are in contact with the top surface of the sheet. A punching head provided in the middle of the drive slider passes through the middle of the stop block, and the drive cylinder is driven and connected to the punching head. A protruding insert on the fixed support is provided with a mating hole corresponding to the punching head. The second punching die punches a single hole on the top surface of the sheet, the third punching die punches two holes on the top surface of the sheet, the first punching die opposite to the second punching die punches two holes on the bottom surface of the sheet, and the first punching die opposite to the third punching die punches a single hole on the bottom surface of the sheet.

[0013] Beneficial effects: The present invention uses an end-side punching die to process through holes on the flanges at both ends of the sheet metal for easy installation, and uses a bottom-side punching die to process through holes on the bottom and top surfaces of the sheet metal, forming a groove-shaped mounting plate. When installing, the through holes on the flanges and the bottom and top surfaces of the mounting plate can be used to fit together, thereby improving the tightness after installation. At the same time, the flanges and the bottom and top surfaces of the mounting plate can form a limiting effect on each other, thus improving the stability after installation through the through holes and making it easier to lock in place. Attached Figure Description

[0014] Appendix Figure 1 This is a diagram of the sheet material structure;

[0015] Appendix Figure 2 For the installation plate structure diagram;

[0016] Appendix Figure 3 This is a structural diagram of the end-side punching die;

[0017] Appendix Figure 4 This is a diagram of the fastening structure;

[0018] Appendix Figure 5 This is a structural diagram of a fixed support.

[0019] Appendix Figure 6 This is a structural diagram of the punching die for the bottom, top, and side surfaces;

[0020] Appendix Figure 7This is a structural diagram of a side punching die. Detailed Implementation

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] As attached Figure 1-7 The processing mold for the left rear mounting plate of the left front seat of an automobile includes an end side punching mold 1 and a bottom and top side punching mold 2. The material plate is processed into a sheet 10 by a blanking mold. The sheet 10 is pre-formed by a forming mold and then the edge of the pre-formed sheet is flanged by a flanging mold. Then, the end side punching mold 1 punches holes on the flanged edges at both ends of the pre-formed sheet. Finally, the bottom and top surfaces of the pre-formed sheet are punched by the bottom and top side punching mold 2. Through holes for easy installation are machined on the flanges at both ends of the sheet using end side punching dies, and through holes are machined on the bottom and top surfaces of the sheet using bottom and top side punching dies, forming a groove-shaped mounting plate. During installation, the through holes on the flanges and the bottom and top surfaces of the mounting plate can be used to fit together, thereby improving the tightness after installation. At the same time, the flanges and the bottom and top surfaces of the mounting plate can form a limiting effect with each other, resulting in better stability after installation through the through holes and making it easier to lock in place.

[0023] The end-side punching die 1 includes a mounting plate 11. A fastening structure 12 for fixing a sheet material on one side of the mounting plate 11 is provided. An inclined punching die 4 is provided at one end of the mounting plate 11, and a curved punching die 5 is provided at the other end. The pre-formed sheet material is adapted to be placed on the surface of the mounting plate 11 and pressed down by a pressure plate 111. The limiting end of the fastening structure 12 is engaged in a groove 101 on one side of the sheet material, and the limiting end of the fastening structure 12 is fixed to the sheet material by bolts. The inclined punching die 4 at one end... The punch assembly 41 moves to punch a hole in the flange at one end of the sheet material, and the punch structure 51 of the curved punching die 5 at the other end moves to punch a hole in the flange at the other end of the sheet material. The sheet material is restricted on the mounting plate and is clamped by the pressure plate in cooperation with the mounting plate. Before punching, the limiting end of the fastening structure clamps the sheet material in cooperation with the mounting plate. Then, the inclined punching die punches a hole in the inclined flange at one end of the sheet material, while the curved punching die punches a hole in the flange at the other end of the sheet material. This allows through holes to be machined on the flange of the sheet material to facilitate installation and improve the stability after installation.

[0024] The fastening structure 12 includes a mating block 121. A driving cylinder is provided on a fixed seat on one side of the mounting plate 11. The driving end of the driving cylinder is drivenly connected to one side of the mating block 121. The other side of the mating block 121 has a protruding mating surface 122. The mating surface 122 is fitted into the groove 101. A limiting block 123 is fixed in the middle of the mating surface 122. The bottom surface of the limiting block 123 fits with the surface of the material sheet. The mounting plate 11 is provided with... There is a protrusion 112 that cooperates with the limiting block 123. The limiting block 123 and the protrusion 112 cooperate to clamp the sheet. The driving cylinder drives the cooperating block to abut against the groove on one side of the sheet. Due to the concave nature of the groove, the cooperating block can limit the sheet in the lateral direction to prevent the sheet from moving easily and causing inaccurate punching position. The cooperating block and the protrusion cooperate to clamp the sheet, which improves the stability of the sheet and makes it easier for the punching die to punch the edge of the sheet.

[0025] The inclined punching die 4 includes a push rod 42. A drive cylinder on the mounting plate 11 is driven to the bottom end of the push rod 42. A punch assembly 41 is inclinedly arranged at the top end of the push rod 42. The punch assembly 41 includes a punch fixing block 411. The surface of the punch fixing block 411 is adapted to the flanged sidewall of the sheet. A plurality of inclined punches 412 are provided on the punch fixing block 411. The cross-section of the inclined punches 412 is elliptical. The plurality of inclined punches 412 are arranged at an inclined spacing. A mating pressure block 113 is fixed on the pressure plate 111. The positions of the plurality of mating pressure blocks 113 are respectively inclinedly arranged corresponding to the positions of the plurality of inclined punches 412. The mating pressure block 113 is provided with a through hole 114 corresponding to the inclined punch 412. The punch fixing block and the mating pressure block work together to clamp the flange. Then, the drive cylinder drives the tilting punch to punch holes in the flange. The waste material punched by the tilting punch can be pushed out through the through hole. By having multiple tilting punches arranged at an angle punch holes in the flange at the same time, through holes that are easy to install are punched out, which facilitates installation and improves the stability of the mounting plate after installation.

[0026] The curved punching die 5 includes a push rod 54, and the punch structure 51 includes a first mating block 52 and a second mating block 53. The driving cylinder on the mounting plate 11 is drivenly connected to the push rod 54. The first mating block 52 and the second mating block 53 are fixed on the push rod 54 on the mounting plate 11. A first punch 531 is provided on the second mating block 53, and a second punch 521 and a third punch 522 are provided on the first mating block 52. The cross-sections of the first punch 531, the second punch 521, and the third punch 522 are rectangles with semicircular ends. 531 is perpendicular to the width direction of the mounting plate 11. The second punch 521 and the third punch 522 are inclined to the width direction of the mounting plate 11, and the inclination of the second punch 521 is greater than that of the third punch 522. The pressure plate 111 is provided with a plurality of corresponding pressure blocks 115. The positions of the plurality of corresponding pressure blocks 115 correspond to the positions of the first punch 531, the second punch 521 and the third punch 522, respectively. The plurality of corresponding pressure blocks 115 are respectively provided with through holes 55 corresponding to the first punch 531, the second punch 521 and the third punch 522. The drive cylinder drives the push rod to move the first and second mating blocks to engage with the corresponding pressure blocks and clamp the flange that needs to be punched. The first mating block, the second mating block and the corresponding pressure block are adapted to the flange surface to facilitate punching. After the flange is clamped and secured, the drive cylinder drives the first punch, the second punch and the third punch to punch the flange. The punched through holes are arranged in a curved shape to adapt to the curved flange of the material, so as to limit the movement through the flange. At the same time, the installation plate formed after installation through the through holes has better stability.

[0027] The bottom and top side punching mold 2 includes a fixed support 21, on which a plurality of protruding inserts 211 are provided. The sheet material is correspondingly clamped on the plurality of protruding inserts 211, and the surface of the protruding inserts 211 is in contact with the inner wall of the sheet material. The pressing plate 22 is set on the fixed support 21 by a telescopic spring, and the pressing plate 22 is correspondingly pressed on the surface of the sheet material. A plurality of side mounting seats 23 are respectively provided on both sides of the fixed support 21, and a side punching mold 6 is provided on the plurality of side mounting seats 23. The plurality of side punching molds 6 are staggered relative to each other, and the plurality of side punching molds 6 punch holes at both ends of the bottom surface and both ends of the top surface of the sheet material respectively. The sheet material is clamped onto several protruding inserts, and then the pressing plate clamps the sheet material from above in conjunction with the protruding inserts to facilitate punching holes on the bottom and top surfaces of the sheet material. The surfaces of the protruding inserts are adapted to the inner wall of the sheet material to prevent the sheet material from sliding during the punching process. The side punching dies on the multiple side mounting seats are respectively machined with through holes on the bottom and top surfaces of the sheet material to facilitate fixing during installation and improve the stability after installation.

[0028] The side punching die 6 includes a first punching die 61, a second punching die 62, and a third punching die 63. Multiple first punching dies 61 are located on one side of the bottom surface of the sheet, and are arranged in parallel with a spacing between them. The second punching dies 62 and the third punching dies 63 are located at both ends of the top surface of the sheet, and are inclined relative to the length direction of the sheet to accommodate the inclined top surface. The inclination degrees of the second punching dies 62 and the third punching dies 63 are the same. The bottom surface of the sheet is a flat surface with a groove in the middle. When processing the bottom surface of the sheet, multiple first punching dies can be correspondingly positioned at both ends of the bottom surface. Since the top surface of the sheet is inclined, the second and third punching dies are inclined when processing the ends of the top surface to accommodate the inclined top surface, facilitating the processing of through holes for easy installation.

[0029] The first punching die 61, the second punching die 62, and the third punching die 63 each include a drive slider 611. A drive cylinder on the side mounting base 23 is driven to one end of the drive slider 611. A stop block 612 is bolted to the other end of the drive slider 611. The sidewall of the stop block 612 of the first punching die 61 is flush with the bottom surface of the sheet material, while the sidewalls of the stop blocks 612 of the second and third punching dies 62 and flush with the top surface of the sheet material. A punching head 66, located in the middle of the drive slider 611, penetrates the middle of the stop block 612, and the drive cylinder is driven to the punching head 66. A protruding insert 211 on the fixed support 21 has a mating hole 661 corresponding to the punching head 66. The drive cylinder causes the drive slider to move the stop block against the top and bottom surfaces of the sheet material, allowing for clamping of multiple sheets from multiple directions, thus improving efficiency. The high-pressure sealing of the material sheet prevents it from shifting easily. Multiple abutment blocks at various positions cooperate with corresponding protruding inserts to clamp the bottom and top surfaces of the material sheet at the punching locations, facilitating punching, reducing the force on the edges of the through holes during punching, and preventing irregular through hole openings that could affect installation and fixation. The second punching die 62 punches a single hole on the top surface of the material sheet, and the third punching die 63 punches two holes on the top surface of the material sheet. The first punching die 61, opposite to the second punching die 62, punches two holes on the bottom surface of the material sheet, and the first punching die 61, opposite to the third punching die 63, punches a single hole on the bottom surface of the material sheet. The through holes punched on the bottom and top surfaces of the material sheet are staggered, and the single and double holes are also staggered. This reduces the number of punches, increases the strength of the material sheet itself, and the staggered punching positions and numbers improve the stability of the mounting plate after installation.

[0030] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, several improvements and changes can be made 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. A processing mold for the left rear mounting plate of the left front seat of an automobile, characterized in that: Includes end side punching die (1) and bottom and top side punching die (2). The material plate is processed into a sheet by the blanking die. The sheet is pre-formed by the forming die and then the edge of the pre-formed sheet is flanged by the flanging die. Then, the end side punching die (1) punches holes on the flanged edges at both ends of the pre-formed sheet. Finally, the bottom and top surfaces of the pre-formed sheet are punched by the bottom and top side punching die (2). The end-side punching die (1) includes a mounting plate (11), one end of which is provided with an inclined punching die (4), and the other end of which is provided with a curved punching die (5). The punch assembly (41) of the inclined punching die (4) at one end moves to punch the flange at one end of the sheet, and the punch structure (51) of the curved punching die (5) at the other end moves to punch the flange at the other end of the sheet; the bottom and top side punching die (2) includes a fixed support (21), and multiple side mounting seats (23) are respectively provided on both sides of the fixed support (21). (23) is provided with a side punching die (6), and multiple side punching dies (6) punch holes at both ends of the bottom surface and both ends of the top surface of the sheet respectively; through the end side punching die, through holes are processed on the flanges at both ends of the sheet to facilitate installation, and through the bottom and top side punching dies, through holes are processed on the bottom and top surfaces of the sheet respectively, forming a groove-shaped mounting plate. When installing, it can be installed by the through holes on the flange and the bottom and top surfaces of the mounting plate, thereby improving the tightness after installation. At the same time, the flange and the bottom and top surfaces of the mounting plate can form a limiting effect with each other, so the stability after installation through the through holes is better, and it is also easy to lock the installation.

2. The processing mold for the left rear mounting plate of the left front seat of an automobile according to claim 1, characterized in that: The end-side punching die (1) includes a mounting plate (11), and a fastening structure (12) for fixing the material sheet on the mounting plate (11) is provided on one side of the mounting plate (11); an inclined punching die (4) is provided at one end of the mounting plate (11), and a curved punching die (5) is provided at the other end of the mounting plate (11). The pre-formed material sheet is adapted to be placed on the surface of the mounting plate (11) and pressed by a pressure plate (111). The limiting end of the fastening structure (12) is fitted into a groove (101) on one side of the material sheet. The limiting end of the fastening structure (12) is fixed to the material sheet by bolts. The punch assembly (41) of the inclined punching die (4) at one end moves to punch the flange at one end of the material sheet, and the punch structure (51) of the curved punching die (5) at the other end moves to punch the flange at the other end of the material sheet.

3. The processing mold for the left rear mounting plate of the left front seat of an automobile according to claim 2, characterized in that: The fastening structure (12) includes a mating block (121). A driving cylinder is provided on a fixed seat on one side of the mounting plate (11). The driving end of the driving cylinder is driven and connected to one side of the mating block (121). The other side of the mating block (121) has a protrusion as a mating abutment surface (122). The mating abutment surface (122) is fitted into the groove (101). A limiting block (123) is fixed in the middle of the mating abutment surface (122). The bottom surface of the limiting block (123) fits with the surface of the material sheet. A protrusion (112) that cooperates with the limiting block (123) is provided on the mounting plate (11). The limiting block (123) and the protrusion (112) cooperate to clamp the material sheet.

4. The processing mold for the left rear mounting plate of the left front seat of an automobile according to claim 3, characterized in that: The inclined punching die (4) includes a push rod (42), and the driving cylinder on the mounting plate (11) is driven to the bottom end of the push rod (42). The top end of the push rod (42) is inclinedly provided with a punch assembly (41). The punch assembly (41) includes a punch fixing block (411). The surface of the punch fixing block (411) is adapted to the flange sidewall of the sheet. The punch fixing block (411) is provided with a plurality of inclined punches (412), and the cross section of the inclined punches (412) is elliptical. The plurality of inclined punches (412) are arranged at an inclined spacing. The pressure plate (111) is fixedly provided with a mating pressure block (113). The positions of the plurality of mating pressure blocks (113) are respectively arranged at an inclined spacing corresponding to the positions of the plurality of inclined punches (412). The mating pressure block (113) is provided with a through hole (114) corresponding to the inclined punch (412).

5. The processing mold for the left rear mounting plate of the left front seat of an automobile according to claim 4, characterized in that: The curved punching die (5) includes a push rod (54), and the punch structure (51) includes a first mating block (52) and a second mating block (53). The driving cylinder on the mounting plate (11) is driven to connect with the push rod (54). The first mating block (52) and the second mating block (53) are fixed on the push rod (54) on the mounting plate (11). A first punch (531) is provided on the second mating block (53), and a second punch (521) and a third punch (522) are provided on the first mating block (52). The cross-sections of the first punch (531), the second punch (521), and the third punch (522) are rectangles with semicircular ends. The head (531) is perpendicular to the width direction of the mounting plate (11). The second punch (521) and the third punch (522) are inclined to the width direction of the mounting plate (11), and the inclination of the second punch (521) is greater than that of the third punch (522). The pressure plate (111) is provided with a plurality of corresponding pressure blocks (115). The positions of the plurality of corresponding pressure blocks (115) correspond to the positions of the first punch (531), the second punch (521) and the third punch (522), respectively. The plurality of corresponding pressure blocks (115) are respectively provided with through holes (55) corresponding to the first punch (531), the second punch (521) and the third punch (522).

6. The processing mold for the left rear mounting plate of the left front seat of an automobile according to claim 5, characterized in that: The bottom and top side punching mold (2) includes a fixed support (21), on which a plurality of protruding inserts (211) are provided. The sheet is correspondingly clamped on the plurality of protruding inserts (211), and the surface of the protruding inserts (211) is in contact with the inner wall of the sheet. The pressing plate (22) is set on the fixed support (21) by a telescopic spring, and the pressing plate (22) is correspondingly pressed on the surface of the sheet. A plurality of side mounting seats (23) are respectively provided on both sides of the fixed support (21), and a side punching mold (6) is provided on the plurality of side mounting seats (23). The plurality of side punching molds (6) are staggered relative to each other, and the plurality of side punching molds (6) punch holes at both ends of the bottom surface and both ends of the top surface of the sheet respectively.

7. The processing mold for the left rear mounting plate of the left front seat of an automobile according to claim 6, characterized in that: The side punching die (6) includes a first punching die (61), a second punching die (62), and a third punching die (63); a plurality of first punching dies (61) are located on one side of the bottom surface of the sheet, and the plurality of first punching dies (61) are arranged in parallel with a spacing between them; the second punching die (62) and the third punching die (63) are located at both ends of the top surface of the sheet, and the second punching die (62) and the third punching die (63) are inclined relative to the length direction of the sheet, adapted to the inclined top surface of the sheet, and the inclination degree of the second punching die (62) and the third punching die (63) is the same.

8. The processing mold for the left rear mounting plate of the left front seat of an automobile according to claim 7, characterized in that: The first punching die (61), the second punching die (62), and the third punching die (63) each include a drive slider (611). A drive cylinder on the side mounting base (23) is driven to one end of the drive slider (611). A stop block (612) is bolted to the other end of the drive slider (611). The sidewall of the stop block (612) of the first punching die (61) is flush with the bottom surface of the sheet material, while the sidewalls of the stop blocks (612) of the second punching die (62) and the third punching die (63) are flush with the top surface of the sheet material. The drive slider (611) The punch (66) in the middle of the block (612) passes through and abuts against the middle of the block (612), and the driving cylinder is connected to the punch (66) for driving. The protruding insert (211) on the fixed support (21) is provided with a mating hole corresponding to the punch (66). The second punching die (62) punches a single hole on the top surface of the sheet, the third punching die (63) punches a double hole on the top surface of the sheet, the first punching die (61) opposite to the second punching die (62) punches a double hole on the bottom surface of the sheet, and the first punching die (61) opposite to the third punching die (63) punches a single hole on the bottom surface of the sheet.

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