A mold processing method for an automobile end cone shell

Abstract

The application discloses a mold machining method for an automobile end cone shell, and the machining method comprises the following steps: first step: forming machining, preforming and forming co-molding are used to perform forming machining on a material sheet, and a shell structure with a gradually raised middle part is formed in the middle part of the material sheet; the shell structure surface is concave-convex; an inclined boss is formed in the middle part of the shell structure surface; second step: shaping, punching and hole flanging machining, shaping, punching and hole flanging co-molding is used to perform shaping on the edge of the boss; the shell structure is inverted, and a hole is punched in the surface of the boss; then, hole flanging machining is performed on the punched hole edge, and the hole axis is inclined to the center line of the shell structure; third step: edge cutting and flanging machining, edge cutting and flanging co-molding is used to cut the edge of the shell structure, and flanging machining is performed on the cutting position. The application provides a mold machining method for an automobile end cone shell, multiple machining molds are arranged to perform co-molding machining, and multiple processes are synchronously machined, so that the machining efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of mold processing for automobile end cone housings. Background Technology

[0002] The processing of automotive end cone housings requires multiple steps, with corresponding processing molds for each step. In the existing processing steps, the processing molds are set up independently, each mold is processed separately, and multiple molds are processed separately to remove the mold, which wastes time. Individual molds cannot perform multiple processes simultaneously, resulting in low processing efficiency. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a mold processing method for automobile end cone housing, which sets up multiple processing molds for common mold processing and multiple processes for simultaneous processing, so as to improve processing efficiency.

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

[0005] The method for machining a mold for an automotive end cone housing is as follows:

[0006] Step 1: Molding process. The sheet material is shaped using a pre-forming and molding mold. A pre-formed shell structure with a gradually raised center is processed in the middle of the sheet material. The surface of the shell structure is uneven. An inclined boss is processed in the middle of the surface of the shell structure.

[0007] Step 2: Shaping, punching and flanging. First, the edge of the boss is shaped by shaping, punching and flanging using a common mold. Then, the shell structure is inverted and holes are punched on the surface of the boss. After that, the edge of the punched through hole is flanged, and the axis of the through hole is inclined to the center line of the shell structure.

[0008] Step 3: Edge trimming and flanging. The edges of the shell structure are trimmed using a common trimming and flanging mold, and the trimmed areas are then flanged.

[0009] Furthermore, the common mold for shaping, punching, and flanging includes a mold frame with vertical spacing; a shaping mold, a punching mold, and a flanging mold are arranged at intervals between the mold frames; one shell structure is inclinedly disposed in the shaping mold for shaping processing, another shell structure is invertedly disposed in the punching mold for punching processing, and a third shell structure is inclinedly disposed in the flanging mold for flanging processing.

[0010] Furthermore, the mold frame includes an installation plate; the bottom of the installation plate is provided with templates via multiple mold feet; the mold feet are fixedly connected to the installation plate and templates respectively by bolts to form the mold frame; the shaping mold, punching mold, and flanging mold are respectively set on templates on opposite mold frames; the shaping mold includes a shaping upper pad plate and a shaping lower pad plate; the bottom of the shaping upper pad plate is provided with a shaping upper mold; the bottom surface of the shaping upper mold is an inclined surface; the shaping lower pad plate is provided with a shaping fixing plate; the shaping fixing plate is provided with a shaping unloading plate; the top surface of the shaping unloading plate is a wedge-shaped surface that matches the inclined surface; the shaping unloading plate has a through-hole in the middle; the shaping lower mold is provided in the mounting hole; the rectangular spring on the shaping fixing plate is connected to the bottom of the shaping lower mold.

[0011] Furthermore, the two ends of the inclined surface are flat; the two ends of the wedge-shaped surface are corresponding to the flat surface, forming a broken line shape; the top of the lower forming mold is provided with an embedded mold; the bottom inclination of the embedded mold is consistent with the inclination of the wedge-shaped surface; the top of the embedded mold is provided with a raised platform; the edge of the raised platform is stepped, and the bottom of the edge of the raised platform is inclined downward; the bottom of the upper forming mold is provided with an inner groove; the inner groove is adapted to the surface of the raised platform on the embedded mold.

[0012] Furthermore, the punching die includes an upper punching pad and a lower punching pad; an upper punching fixing plate is provided at the bottom of the upper punching pad; a punching unloading block is provided at the bottom of the upper punching fixing plate via an unloading block, and the unloading block fixing block is connected to the bottom of the upper punching fixing plate via a rectangular spring; a lower punching die is provided on the lower punching pad via a lower punching fixing plate; the surface of the lower punching die is an inclined surface, and the inclined surface cooperates with the bottom of the punching unloading block to squeeze the material sheet.

[0013] Furthermore, the punching unloading block and the unloading block fixing block have a through-hole in the middle; the punch at the bottom of the punching upper fixing plate passes through the through-hole; the punching lower die has an installation hole at the top; the inner wall contour of the installation hole is the same as the inner wall contour of the inner groove; the bottom of the installation hole has an embedding hole, the diameter of which is larger than the bottom diameter of the installation hole; an insert is provided in the embedding hole; a through hole is provided in the middle of the insert; the punch moves through the through hole to punch the material sheet in the installation hole.

[0014] Furthermore, the two ends of the punching lower die are flat, and the top flat surface of the punching lower die is in contact with the bottom surface of the punching unloading block; a guide block is provided on one side of the punching unloading block; the top of the guide block is fixed to the bottom of the template; the bottom of the guide block corresponds to the guide hole opened on the top flat surface of the punching lower die.

[0015] Furthermore, the flanging mold includes an upper flanging pad and a lower flanging pad; the upper flanging mold is provided at the bottom of the upper flanging pad; a flanging unloading block is provided on the lower flanging pad via a rectangular spring; a lower flanging punch is provided on the unloading block; the lower flanging punch is fitted into a corresponding groove provided at the bottom of the upper flanging mold.

[0016] Furthermore, the upper pad of the flip-hole has a through-hole in the middle; the bottom of the accommodating hole extends and connects to the corresponding groove, and the accommodating hole is set with a through hole corresponding to the shell structure; the diameter of the accommodating hole is larger than the diameter of the through hole of the shell structure; a top material block is provided in the accommodating hole; the top of the top material block is fixed to a rectangular spring on the template; the surface of the lower punch of the flip-hole is adapted to the inner wall of the corresponding groove; an insert is provided on the top of the lower punch of the flip-hole at the position corresponding to the accommodating hole; the diameter of the insert is smaller than the same as the diameter of the through hole of the shell structure; when the lower punch of the flip-hole moves and inserts into the corresponding groove, the insert is inserted into the accommodating hole; when the lower punch of the flip-hole disengages from the corresponding groove, the top material block pushes the shell structure.

[0017] Beneficial effects: The present invention first shapes the edge of the boss, then processes through holes on the surface of the boss, and then performs flanging processing on the through holes to form a shell structure that meets the requirements. This facilitates the shell flanging position to be adapted to the end cone of the car, reducing the gap between the end cone and the shell and ensuring stability. The excess waste edge of the shell is cut off, and then the cut position is flanged. During installation, the flanged edge can fit better on the end cone, further increasing the stability of the end cone and the shell. At the same time, the center of the flanged edge is misaligned with the through hole, which can relatively cooperate to limit the end cone and increase stability. Attached Figure Description

[0018] Appendix Figure 1 This is a flowchart of the processing method;

[0019] Appendix Figure 2 This is a diagram of the common mold structure for shaping, punching, and flanging.

[0020] Appendix Figure 3 This is a structural diagram of the shaping mold;

[0021] Appendix Figure 4 Here is a structural diagram of the punching die;

[0022] Appendix Figure 5 This is a diagram of the common-mode structure for edge cutting and flanging;

[0023] Appendix Figure 6 This is a structural diagram of the cutting edge mold;

[0024] Appendix Figure 7 This is a structural diagram of the flange mold. Detailed Implementation

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] As attached Figure 1-7 The method for machining a mold for an automotive end cone housing is as follows:

[0027] Step 1: Molding Processing. The sheet material is pre-formed using a pre-forming and molding co-mold. A shell structure with a progressively raised center is pre-formed in the middle of the sheet material. The surface of the shell structure is uneven. An inclined boss is formed in the middle of the shell structure surface. The sheet material is first pre-formed to form a shell structure with a raised center, and then the raised position is formed to form an inclined boss. This prevents the inclined boss from being subjected to excessive local stress in a single molding process, which could lead to insufficient strength.

[0028] Step 2: Shaping, punching, and flanging. The edges of the boss are first shaped using a common mold for shaping, punching, and flanging. The shell structure is then inverted, and holes are punched on the surface of the boss. The edges of the punched through holes are then flanged, with the axis of the through holes inclined to the center line of the shell structure. The boss edges are shaped first, then through holes are machined on the surface of the boss, and then the through holes are flanged to form a shell structure that meets the requirements. This facilitates the fitting of the flanged position of the shell onto the end cone of the car, reducing the gap between the end cone and the shell and ensuring stability.

[0029] Step 3: Edge trimming and flanging. The edges of the shell structure are trimmed using a common trimming and flanging mold, and the trimmed areas are then flanged. Excess waste edges are trimmed off, and the trimmed areas are then flanged. During installation, the flanged edges fit better onto the end cone, further increasing the stability of the end cone and the shell. At the same time, the center of the flanged edges is offset from the through hole, which can relatively cooperate to limit the end cone and increase stability.

[0030] The preforming and forming mold includes a preforming mold; the preforming mold includes a top plate and a bottom plate; a preforming upper mold is fixed at the bottom of the top plate; a preforming lower mold is provided at the top of the bottom plate; the preforming upper mold and the preforming lower mold are arranged opposite to each other; the surface of the preforming lower mold is raised; the bottom of the preforming upper mold is provided with an extrusion groove corresponding to the raised part of the preforming lower mold; a driving device on the bottom plate drives a push rod to move the preforming lower mold and push the material sheet into the extrusion groove, thereby forming a preformed shell structure; the forming mold includes a forming lower mold and a forming upper mold; a boss is provided at the top of the forming lower mold, and the boss is inclined; a rectangular spring on the bottom plate elastically drives the forming lower mold to move, and the forming lower mold drives the boss to extrude the shell structure, thereby forming an inclined boss; thus processing the formed shell structure for subsequent processing.

[0031] The common mold for shaping, punching, and flanging includes a mold base 1 with vertical spacing; a shaping mold 2, a punching mold 3, and a flanging mold 4 are arranged at intervals between the mold bases 1; one shell structure is inclinedly disposed within the shaping mold 2 for shaping, another shell structure is invertedly disposed within the punching mold 3 for punching, and a third shell structure is inclinedly disposed within the flanging mold 4 for flanging. This common mold design for shaping, punching, and flanging allows multiple processes to be performed simultaneously, increasing mold processing efficiency.

[0032] The mold frame 1 includes an mounting plate 11; the bottom of the mounting plate 11 is provided with templates 12 via multiple mold feet; the mold feet are fixedly connected to the mounting plate 11 and templates 12 by bolts to form the mold frame 1; the shaping mold 2, punching mold 3, and flanging mold 4 are respectively arranged on templates 12 on opposite mold frames 1; the shaping mold 2 includes a shaping upper pad 21 and a shaping lower pad 23; the bottom of the shaping upper pad 21 is provided with a shaping upper mold 22; the shaping upper mold The bottom surface of the upper forming die 22 is an inclined surface 221; a forming fixing plate 24 is provided on the forming lower pad 23; a forming unloading plate 25 is provided on the forming fixing plate 24; the top surface of the forming unloading plate 25 is a wedge-shaped surface 251 that cooperates with the inclined surface 221; a mounting hole 252 is provided through the middle of the forming unloading plate 25; a forming lower die 26 is provided in the mounting hole 252; a rectangular spring on the forming fixing plate 24 is connected to the bottom of the forming lower die 26. The inclined surface of the forming upper die cooperates with the wedge-shaped surface of the forming unloading plate, causing the shell structure to be inclined along the inclined surface, so as to make the axis of the through hole vertical, so as to shape the side wall of the through hole.

[0033] The inclined surface 221 has two flat edges 222 at both ends; the wedge-shaped surface 251 is set at both ends corresponding to the flat edges 222, forming a broken line shape; the top of the shaping lower die 26 is provided with an embedded die 261; the bottom inclination of the embedded die 261 is the same as the inclination of the wedge-shaped surface 251; the top of the embedded die 251 is provided with a raised platform 253; the edge of the raised platform 253 is stepped, and the bottom of the edge of the raised platform 253 is inclined downward; the bottom center of the shaping upper die 22 has an inner groove 223; the inner groove 223 is adapted to the surface of the raised platform 253 on the embedded die 261. The cross-section of the extrusion surface formed between the inclined surface and the wedge-shaped surface is broken line, which can effectively increase the stability between the inclined surface and the wedge-shaped surface and avoid misalignment.

[0034] The punching die 3 includes an upper punching pad 31 and a lower punching pad 34. An upper punching fixing plate 32 is provided at the bottom of the upper punching pad 31. A punching unloading block 33 is provided at the bottom of the upper punching fixing plate 32 via a material unloading block fixing block, and the bottom of the upper punching fixing plate 32 is connected to the material unloading block fixing block via a rectangular spring. A lower punching die 36 is provided on the lower punching pad 34 via a lower punching fixing plate 35. The surface of the lower punching die 36 is inclined, and the inclined surface cooperates with the bottom of the punching unloading block 33 to press the material sheet. The lower punching die and the punching unloading plate can press against each other to tighten the edges of the shell structure, facilitating the movement of the shell structure during punching processing and preventing misalignment of the punching position.

[0035] The punching unloading block 33 and the unloading block fixing block have a through hole 331 in the middle; the punch 37 at the bottom of the punching upper fixing plate 32 passes through the through hole 331; the punching lower die 36 has a mounting hole 361 at the top; the inner wall contour of the mounting hole 361 is the same as the inner wall contour of the inner groove 223; the bottom of the mounting hole 361 has an embedding hole 362, the diameter of the embedding hole 362 is larger than the bottom diameter of the mounting hole 361; an insert 363 is provided in the embedding hole 362; a through hole 364 is provided in the middle of the insert 363; the punch 37 moves through the through hole 364 to punch the material in the mounting hole 361. The shell structure is inverted in the mounting hole. The mounting hole can limit the shell structure and prevent it from moving. At the same time, it can facilitate the downward movement of the punch to punch the surface of the shell structure boss to form a through hole. The insert restricts the edge of the boss and prevents the edge of the boss from being squeezed by the punch and causing edge damage. The waste pieces punched off the boss fall into the through hole.

[0036] The two ends of the punching die 36 are flat, and the top flat surface of the punching die 36 contacts the bottom surface of the punching unloading block 33; this facilitates the cooperation between the punching die and the punching unloading block, and plays a guiding and positioning role; a guide block 38 is provided on one side of the punching unloading block 33; the top of the guide block 38 is fixed to the bottom of the template 12; the bottom of the guide block 38 corresponds to the guide hole 381 opened on the top flat surface of the punching die 36; through the cooperation of the guide block and the guide hole, the guiding effect is further increased, and misalignment is prevented during punching.

[0037] The flanging mold 4 includes an upper flanging pad 41 and a lower flanging pad 42; an upper flanging mold 43 is provided at the bottom of the upper flanging pad 41; a flanging unloading block 44 is provided on the lower flanging pad 42 via a rectangular spring; a lower flanging punch 45 is provided on the lower flanging unloading block 44; the lower flanging punch 45 is fitted into a corresponding groove 431 at the bottom of the upper flanging mold 43. The shell structure is covered by the lower flanging punch; when the lower flanging punch is embedded in the upper flanging mold, it can perform flanging processing on the shell structure; multiple positioning pins 46 are provided at the bottom of the upper flanging mold; the multiple positioning pins are arranged around to limit the shell structure, and the positioning pins also play a guiding and positioning role.

[0038] The upper pad 41 of the flip-hole has a through-hole accommodating hole 411 in the middle; the bottom of the accommodating hole 411 extends and connects to the corresponding groove 431, and the accommodating hole 411 is set to the through hole of the shell structure; the diameter of the accommodating hole 411 is larger than the diameter of the through hole of the shell structure; a top material block 412 is provided in the accommodating hole 411; the top of the top material block 412 is fixed to a rectangular spring on the template 12; the surface of the lower punch 45 of the flip-hole is adapted to the inner wall of the corresponding groove 431; an insert 451 is provided on the top of the lower punch 45 of the flip-hole at the position corresponding to the accommodating hole 411; the diameter of the insert 451 is smaller than the same as the diameter of the through hole of the shell structure; when the lower punch 45 of the flip-hole moves and inserts into the corresponding groove 431, the insert 4512 is inserted into the accommodating hole 411; when the lower punch 45 of the flip-hole disengages from the corresponding groove 431, the top material block 412 pushes the shell structure. When the rectangular spring acts elastically to cause the lower punch to embed into the corresponding groove, the insert at the top of the lower punch performs a flipping operation on the through hole of the shell structure, thus forming a flipped hole. When the lower punch disengages from the corresponding groove, the elasticity of the rectangular spring pushes the ejector block to move and push the flipped hole of the shell structure, causing the shell structure to disengage from the corresponding groove. The operation is simple. By using a common mold to process the shell structure, multiple processing steps can be performed simultaneously, thereby improving processing efficiency.

[0039] The edge trimming and flanging common mold includes an edge trimming mold 6 and a flanging mold 7; the edge trimming mold 6 includes an upper mounting plate and a lower mounting plate; an upper edge trimming mold 61 is fixedly mounted on the bottom of the upper mounting plate; a receiving groove is formed in the middle of the bottom of the upper edge trimming mold 61; the inner wall of the receiving groove is adapted to the surface of the shell structure; a spliced ​​slice 611 is provided at the edge of the receiving groove 65 of the upper edge trimming mold; the slice 611 is detachably mounted on the bottom of the upper edge trimming mold; a lower edge trimming mold 62 is provided on the top of the lower mounting plate; an insert 63 is fixed on the top of the lower edge trimming mold; the surface of the insert is adapted to the inner wall of the shell structure; an annular groove 64 is formed on the surface of the lower edge trimming mold, the annular groove is circumferentially arranged around the edge of the insert; the slice is positioned corresponding to the annular groove. The driving device on the lower mounting plate drives the push rod to move the lower cutting die, and the slicing cuts off the waste edges of the shell structure. The flanging die 7 includes a lower flanging die 71 and an upper flanging die 72. The upper flanging die is fixed to the bottom of the upper mounting plate. The bottom of the upper flanging die 72 has a flanging groove 75 that matches the surface of the shell structure. The inlay block 73 on the top of the lower flanging die 71 matches the interior of the shell structure. The push rod on the lower mounting plate is provided with the lower flanging die. The push rod 74 drives the lower flanging die and the inlay block to push the shell structure into the flanging groove 75. The edge of the shell structure is squeezed by the edge of the flanging groove to form a flanging. After the shell structure is removed, the processing is completed.

[0040] 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 method for machining a mold for an automobile end cone housing, characterized in that, The processing method is as follows: Step 1: Molding process. The sheet material is shaped using a pre-forming and molding mold. A pre-formed shell structure with a gradually raised center is processed in the middle of the sheet material. The surface of the shell structure is uneven. An inclined boss is processed in the middle of the surface of the shell structure. Step 2: Shaping, punching and flanging. First, the edge of the boss is shaped by shaping, punching and flanging using a common mold. Then, the shell structure is inverted and holes are punched on the surface of the boss. After that, the edge of the punched through hole is flanged, and the axis of the through hole is inclined to the center line of the shell structure. Step 3: Edge trimming and flanging. The edges of the shell structure are trimmed using a common trimming and flanging mold, and the trimmed areas are then flanged. The forming, punching and flanging mold includes a mold frame (1) with a vertical spacing; a forming mold (2), a punching mold (3) and a flanging mold (4) are arranged at a distance between the mold frames (1); one of the shell structures is inclined in the forming mold (2) for forming, another shell structure is inverted in the punching mold (3) for punching, and a third shell structure is inclined in the flanging mold (4) for flanging. The mold frame (1) includes a mounting plate (11); the mounting plate (11) is provided with templates (12) through multiple mold feet; the mold feet are fixedly connected to the mounting plate (11) and templates (12) respectively by bolts to form the mold frame (1); the shaping mold (2), punching mold (3) and flanging mold (4) are respectively set on the templates (12) on the opposite mold frame (1); the shaping mold (2) includes a shaping upper pad plate (21) and a shaping lower pad plate (23); the bottom of the shaping upper pad plate (21) is provided with a shaping upper mold (22); the shaping The bottom surface of the upper mold (22) is an inclined surface (221); a shaping fixing plate (24) is provided on the shaping lower pad (23); a shaping unloading plate (25) is provided on the shaping fixing plate (24); the top surface of the shaping unloading plate (25) is a wedge-shaped surface (251) that matches the inclined surface (221); a mounting hole (252) is provided through the middle of the shaping unloading plate (25); a shaping lower mold (26) is provided in the mounting hole (252); a rectangular spring on the shaping fixing plate (24) is connected to the bottom of the shaping lower mold (26); The inclined surface (221) has two flat edges (222) at both ends; the wedge-shaped surface (251) is set at both ends corresponding to the flat surface (222) to form a broken line shape; the lower forming mold (26) is provided with an embedded mold (261) at the top; the bottom inclination of the embedded mold (261) is consistent with the inclination of the wedge-shaped surface (251); the top of the embedded mold (261) is provided with a raised platform (253); the edge of the raised platform (253) is stepped, and the bottom edge of the raised platform (253) is inclined downward; the middle of the bottom of the upper forming mold (22) is provided with an inner groove (223); the inner groove (223) is adapted to the surface of the raised platform (253) on the embedded mold (261).

2. The mold processing method for automobile end cone housing according to claim 1, characterized in that: The punching die (3) includes an upper punching pad (31) and a lower punching pad (34); the upper punching pad (31) is provided with an upper punching fixing plate (32) at the bottom; the upper punching fixing plate (32) is provided with a punching unloading block (33) at the bottom through an unloading block fixing block, and the lower punching fixing plate (32) is connected to the unloading block fixing block by a rectangular spring; the lower punching pad (34) is provided with a lower punching die (36) through a lower punching fixing plate (35); the surface of the lower punching die (36) is a slope, and the slope cooperates with the bottom of the punching unloading block (33) to squeeze the material sheet.

3. The mold processing method for automobile end cone housing according to claim 2, characterized in that: The punching unloading block (33) and the unloading block fixing block are provided with a through hole (331) in the middle; the punch (37) provided at the bottom of the punching upper fixing plate (32) passes through the through hole (331); the punching lower die (36) is provided with a mounting hole (361) at the top; the inner wall contour of the mounting hole (361) is the same as the inner wall contour of the inner groove (223); the mounting hole (362) is provided with an embedding hole (362) at the bottom, and the diameter of the embedding hole (362) is larger than the bottom diameter of the mounting hole (361); an insert (363) is provided in the embedding hole (362); a through hole (364) is provided in the middle of the insert (363); the punch (37) moves through the through hole (364) to punch the material in the mounting hole (361).

4. The mold processing method for automobile end cone housing according to claim 3, characterized in that: The two ends of the punching die (36) are flat, and the top flat surface of the punching die (36) is in contact with the bottom surface of the punching unloading block (33); a guide block (38) is provided on one side of the punching unloading block (33); the top of the guide block (38) is fixed to the bottom of the upper template (12); the bottom of the guide block (38) corresponds to the guide hole (381) opened on the top flat surface of the punching die (36).

5. The mold processing method for automobile end cone housing according to claim 4, characterized in that: The hole-flipping mold (4) includes a hole-flipping upper pad plate (41) and a hole-flipping lower pad plate (42); a hole-flipping upper mold (43) is provided at the bottom of the hole-flipping upper pad plate (41); a hole-flipping unloading block (44) is provided on the hole-flipping lower pad plate (42) by means of a rectangular spring; a hole-flipping lower punch (45) is provided on the hole-flipping unloading block (44); the hole-flipping lower punch (45) is fitted into a corresponding groove (431) provided at the bottom of the hole-flipping upper mold (43).

6. The mold processing method for automobile end cone housing according to claim 5, characterized in that: The upper pad (41) of the flip-hole has a through-hole (411) in the middle; the bottom of the accommodating hole (411) extends to connect with the corresponding groove (431), and the accommodating hole (411) is set with a through hole corresponding to the shell structure; the diameter of the accommodating hole (411) is larger than the diameter of the through hole of the shell structure; a top piece (412) is provided in the accommodating hole (411); the top of the top piece (412) is fixed to a rectangular spring on the template (12); the surface of the lower punch (45) of the flip-hole is flush with... The inner wall of the corresponding groove (431) is adapted; the top of the flip-hole punch (45) is provided with a first insert (451) at the position corresponding to the receiving hole (411); the diameter of the first insert (451) is smaller than the diameter of the through hole of the shell structure; when the flip-hole punch (45) moves and embeds into the corresponding groove (431), the first insert (451) is embedded into the receiving hole (411); when the flip-hole punch (45) disengages from the corresponding groove (431), the top block (412) pushes the shell structure.

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