Side punching die

Abstract

The utility model relates to the technical field of stamping dies, in particular to a side punching die which is used for punching a to-be-punched piece, the side punching die comprises a lower die, a punching assembly and a driving assembly, when the to-be-punched piece is punched, the punching portion of the to-be-punched piece is attached to the side wall, provided with an inserting hole, of a containing groove of the lower die, and the inserting hole is formed in the side wall of the containing groove of the lower die. The driving assembly drives the sliding block to move in the direction close to the inserting hole, then the punch penetrates through the punching part of the part to be punched and finally stretches into the inserting hole, and then a punched hole is formed in the punching part. In the punching process, if the punch and the to-be-punched piece are clamped or the punch and the lower die are clamped, due to the fact that a is larger than b and smaller than c, the gasket can be broken, at the moment, the sliding block continues to move in the direction close to the inserting hole, meanwhile, the punch can stretch into the containing hole of the sliding block, clamping stagnation of the sliding block can be avoided, and the service life of the sliding block is prolonged. Therefore, greater die damage caused by interference of die parts is avoided, and the risk coefficient of operators is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of stamping dies, in particular to a side punching die. Background Art

[0002] Stamping is a pressure processing method that uses a stamping die installed on a press to apply pressure to the raw material at room temperature to separate or plastically deform the raw material, thereby obtaining the required parts. The punching die is a die that punches various types of holes out of the raw material.

[0003] Because the stamping die is a structure with up-and-down reciprocating motion, conventional blanking is achieved by opening and closing the upper and lower dies. Therefore, the side punch is an unconventional forming structure. During the forming process, the side punch slider is fixed to the side punch head, which in turn drives the side punch head to move to punch the part to be punched. Due to factors such as unstable force on the side punch head, the side punch head is prone to jamming or breaking. Once broken, it is very likely to cause the side punch slider to jam, resulting in interference between mold parts and greater mold damage, while also increasing the risk factor for operators.

[0004] Therefore, a side punching die is urgently needed to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a side punching die to solve the problem in related technologies that the side punch is easily stuck or broken due to factors such as unstable force on the side punch, which in turn causes the side punch slider to get stuck, resulting in interference between mold parts and greater mold damage, and also increases the risk factor for operators.

[0006] The utility model provides a side punching die for punching a part to be punched, and the side punching die comprises:

[0007] A lower mold, wherein the top wall of the lower mold is provided with a receiving groove in a vertical direction, and the side wall of the receiving groove is provided with a plug hole;

[0008] A punching assembly includes a slider, a gasket, and a punch, wherein the slider is disposed in the receiving groove, a receiving hole is recessed in the side wall of the slider opposite the insertion hole, the gasket is fixedly connected to the slider and covers the receiving hole, the punch is fixedly connected to the gasket, the punch is opposite the receiving hole along the axial direction of the punch, the part to be punched is attached to the side wall of the receiving groove and is located between the insertion hole and the punch, the plate strength of the gasket is a, the plate strength of the part to be punched is b, and the breaking strength of the punch is c, where b<a<c;

[0009] A driving assembly drives the slider to move so that the punch passes through the part to be punched and extends into the insertion hole.

[0010] As an optimal technical solution for the side punching die, the axis of the plug hole and the axis of the punch are collinear.

[0011] As an optimal technical solution for the side punching die, the lower die is provided with a channel along the vertical direction, the channel is communicated with the plug hole, and the channel and the plug hole are connected to form an L-shaped pipeline.

[0012] As a preferred technical solution of the side punching die, a first inclined surface is provided on the side of the slider away from the punch along the axial direction of the punch;

[0013] The driving assembly includes an upper mold and a driving rod. Along the vertical direction, the bottom wall of the upper mold is opposite to the top wall of the lower mold. One end of the driving rod is fixed to the upper mold. The upper mold slides relative to the lower mold along the vertical direction so that the other end of the driving rod abuts against the first inclined surface and slides relatively.

[0014] As an optimal technical solution for the side punching die, a second inclined surface is provided at the other end of the driving rod, and the second inclined surface can be fitted with the first inclined surface.

[0015] As a preferred technical solution for the side punching die, the driving assembly further includes a first elastic member, which is arranged between the slider and the side wall where the plug hole is located.

[0016] As an optimal technical solution for the side punching die, the upper die includes an upper die base, an upper pad and an upper clamping plate stacked in sequence along the vertical direction, and the other end of the driving rod passes through the upper clamping plate and abuts against the upper pad.

[0017] As an optimal technical solution for the side punching mold, the upper mold also includes a stripping cover plate, a stripping plate and a second elastic member. The stripping cover plate and the stripping plate are stacked in sequence. The stripping cover plate and the upper clamping plate are connected with a second elastic member. The side of the stripping plate away from the stripping cover plate is the bottom wall of the upper mold.

[0018] As an optimal technical solution for the side punching die, a guide column is provided along the vertical direction on the side of the stripping cover plate away from the stripping plate, and the guide column is sequentially passed through the upper clamping plate, the upper pad and the upper die base, and the guide column is respectively slidably fitted with the upper clamping plate, the upper pad and the upper die base.

[0019] As an optimal technical solution for the side punching die, the lower die includes a lower die base, a lower pad and a lower template stacked in sequence along the vertical direction, and the side of the lower template away from the lower pad is the top wall of the lower die.

[0020] The beneficial effects of the utility model are:

[0021] The utility model provides a side punching die for punching a piece to be punched, the side punching die comprises a lower die, a punching assembly and a driving assembly, the top wall of the lower die is provided with a receiving groove in a vertical direction, and the side wall of the receiving groove is provided with a plug-in hole; the punching assembly comprises a slider, a gasket and a punch, the slider is provided in the receiving groove, the side wall of the slider opposite to the plug-in hole is provided with a receiving hole, the gasket is fixed to the slider and covers the receiving hole, the punch is fixed to the gasket, the punch is opposite to the receiving hole along the axial direction of the punch, the piece to be punched is attached to the side wall of the receiving groove and is located between the plug-in hole and the punch, the plate strength of the gasket is a, the plate strength of the piece to be punched is b, the breaking strength of the punch is c, and b<a<c; the driving assembly drives the slider to move so that the punch passes through the piece to be punched and extends into the plug-in hole. When punching a part to be punched, the punching portion of the part to be punched is placed on the side wall of the receiving groove where the plug hole is provided. At this time, the driving component drives the slider to move in the direction close to the plug hole, so that the punch passes through the punching portion of the part to be punched and finally extends into the plug hole. When the driving component drives the slider to move in the direction away from the plug hole, the punch is separated from the punching portion, and a hole is formed in the punching portion. During the above punching process, if the punch is stuck with the part to be punched, or the punch is stuck with the lower die, the gasket will break due to b<a<c. At this time, the slider continues to move in the direction close to the plug hole, and at the same time, the punch will extend into the receiving hole of the slider. This setting can avoid the slider from getting stuck, thereby avoiding interference with the mold parts to cause greater mold damage, and reducing the risk factor for the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a side punching die in an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0024] In the picture:

[0025] Y, vertical direction;

[0026] 100, part to be punched; 101, first plate; 102, second plate;

[0027] 1. Lower die; 11. Lower die base; 12. Lower plate; 13. Lower template; 131. Receiving groove; 132. Connecting hole; 133. Channel;

[0028] 21. Slider; 211. Accommodating hole; 212. First inclined surface; 22. Gasket; 23. Punch;

[0029] 31. Upper die; 311. Upper die base; 312. Upper pad; 313. Upper clamping plate; 314. Stripping cover; 315. Stripping plate; 316. Second elastic member; 32. Driving rod; 321. Second inclined surface; 33. First elastic member. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific position, be constructed and operated in a specific position, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0034] like Figure 1 and Figure 2 As shown, this embodiment provides a side punching die for punching a punching part 100. The side punching die includes a lower die 1, a punching assembly and a driving assembly. The top wall of the lower die 1 is provided with a receiving groove 131 along the vertical direction Y, and the side wall of the receiving groove 131 is provided with a plug hole 132; the punching assembly includes a slider 21, a gasket 22 and a punch 23. The slider 21 is provided in the receiving groove 131, and the side wall of the slider 21 opposite to the plug hole 132 is provided with a receiving hole 211. The gasket 22 is fixed to the slider 21. The punch 23 is connected to and covers the accommodating hole 211, and the punch 23 is fixedly connected to the gasket 22. The punch 23 is opposite to the accommodating hole 211 along the axial direction of the punch 23. The part to be punched 100 is attached to the side wall of the accommodating groove 131 and is located between the plug hole 132 and the punch 23. The plate strength of the gasket 22 is a, the plate strength of the part to be punched 100 is b, and the breaking strength of the punch 23 is c, b<a<c; the driving assembly drives the slider 21 to move so that the punch 23 passes through the part to be punched 100 and extends into the plug hole 132. When punching the part to be punched 100, the punching part of the part to be punched 100 is placed on the side wall of the accommodating groove 131 where the plug hole 132 is provided. At this time, the driving component drives the slider 21 to move toward the direction close to the plug hole 132, and then the punch 23 passes through the punching part of the part to be punched 100, and finally extends into the plug hole 132. When the driving component drives the slider 21 to move away from the plug hole 132, the punch 23 is detached from the punching part, and a punched hole is formed in the punching part. During the above-mentioned punching process, if the punch 23 is stuck with the part to be punched 100, or the punch 23 is stuck with the lower die 1, since b<a<c, the gasket 22 will break. At this time, the slider 21 continues to move toward the direction close to the plug hole 132. At the same time, the punch 23 will extend into the accommodating hole 211 of the slider 21. This setting can avoid the slider 21 from getting stuck, thereby avoiding interference with the mold parts to cause greater damage to the mold, and reducing the risk factor for the operator.

[0035] Specifically, since b < a, when the side punching die is operating normally, the gasket 22 can provide sufficient support force to the punch 23 to ensure that the punch 23 can punch the punching member 100 normally. When the punch 23 is stuck, the force exerted by the punch 23 on the gasket 22 is greater than the maximum force that the gasket 22 can withstand. Therefore, the gasket 22 will break, allowing the punch 23 to extend into the receiving hole 211. The purpose of a < c is to prevent the support force of the gasket 22 from being greater than the maximum force that the punch 23 can withstand, thereby avoiding damage to the punch 23.

[0036] Optionally, the axis of the insertion hole 132 is collinear with the axis of the punch 23. In this embodiment, this arrangement can avoid the problem of the punch 23 being stuck during the insertion of the insertion hole 132.

[0037] Optionally, the lower die 1 is provided with a channel 133 along the vertical direction Y, the channel 133 being connected to the plug hole 132, and the channel 133 and the plug hole 132 are connected to form an L-shaped pipeline. In this embodiment, when the punch 23 passes through the workpiece to be punched 100 and extends into the plug hole 132, the punch 23 will carry the waste material cut from the workpiece to be punched 100 into the plug hole 132. Since the channel 133 is provided along the vertical direction Y, the waste material in the plug hole 132 will slide down along the channel 133. Specifically, one end of the channel 133 is connected to the plug hole 132, and the other end of the channel 133 is connected to the waste bucket, thereby allowing the waste material in the channel 133 to enter the waste bucket along the channel 133.

[0038] Optionally, along the axial direction of the punch 23, a first inclined surface 212 is provided on the side of the slider 21 away from the punch 23; the driving assembly includes an upper mold 31 and a driving rod 32. Along the vertical direction Y, the bottom wall of the upper mold 31 is opposite to the top wall of the lower mold 1, and one end of the driving rod 32 is fixed to the upper mold 31. The upper mold 31 slides relative to the lower mold 1 along the vertical direction Y so that the other end of the driving rod 32 abuts against the first inclined surface 212 and slides relatively. In this embodiment, in the vertical direction Y from the lower mold 1 to the upper mold 31, the first inclined surface 212 is inclined in the direction close to the plug hole 132. Since the upper mold 31 can only move relative to the lower mold 1 along the vertical direction Y, when the other end of the driving rod 32 abuts against the first inclined surface 212 and slides relatively, the driving rod 32 drives the slider 21 to move in the direction close to the plug hole 132, thereby realizing the driving of the slider 21.

[0039] Optionally, a second inclined surface 321 is provided at the other end of the driving rod 32, and the second inclined surface 321 can be aligned with the first inclined surface 212. In this embodiment, this arrangement enables surface-to-surface interaction between the driving rod 32 and the slider 21. Compared to point-to-surface contact or line-to-surface contact between the first inclined surface 212 and the driving rod 32, this arrangement can improve the durability and stability of the first inclined surface 212, and prevent the force of the driving rod 32 from forming pits or grooves on the first inclined surface 212, which could cause the driving rod 32 and the slider 21 to become stuck.

[0040] Optionally, the drive assembly further includes a first elastic member 33, which is disposed between the slider 21 and the sidewall where the insertion hole 132 is located. In this embodiment, when the upper mold 31 moves away from the lower mold 1 along the vertical direction Y, the slider 21 moves away from the insertion hole 132 under the action of the first elastic member 33. Specifically, the first elastic member 33 can be one of a coil spring, an elastic rubber, and an elastic plate.

[0041] Optionally, the upper die 31 includes an upper die base 311, an upper pad 312, and an upper clamping plate 313 stacked in sequence along the vertical direction Y. The other end of the driving rod 32 passes through the upper clamping plate 313 and abuts against the upper pad 312. In this embodiment, the upper die base 311, the upper pad 312, and the upper clamping plate 313 are fixedly connected by bolts. The upper clamping plate 313 functions to limit the driving rod 32 so that the driving rod 32 cannot move horizontally. Since the upper die base 311 is made of a soft metal material, if the driving rod 32 directly abuts against the upper die base 311, when the driving rod 32 interacts with the slider 21, the reaction force of the driving rod 32 can easily damage the upper die base 311. Therefore, an upper pad 312 is provided between the upper clamping plate 313 and the upper die base 311. The upper pad 312 is made of a hard metal material so that the upper pad 312 can withstand the reaction force of the driving rod 32.

[0042] Optionally, the upper mold 31 also includes a stripping cover plate 314, a stripping plate 315 and a second elastic member 316. The stripping cover plate 314 and the stripping plate 315 are stacked in sequence. The stripping cover plate 314 and the upper clamping plate 313 are connected with the second elastic member 316. The side of the stripping plate 315 away from the stripping cover plate 314 is the bottom wall of the upper mold 31. In this embodiment, the part to be punched 100 generally includes a punching portion and a fixing portion. The punching portion is attached to the side wall provided with the plug hole 132, and the fixing portion is provided on the top wall of the lower mold 1. As the upper mold 31 moves toward the lower mold 1 along the vertical direction Y, the bottom wall of the stripper plate 315 first abuts against the top wall of the lower mold 1, and then the fixing portion is clamped between the top wall and the bottom wall. Subsequently, the upper mold base 311, the upper pad 312 and the upper clamping plate 313 overcome the elastic force of the second elastic member 316, and the upper mold base 311, the upper pad 312 and the upper clamping plate 313 continue to move toward the lower mold 1, thereby causing the driving rod 32 to drive the slider 21 to move toward the plug hole 132. At the same time, the clamping force of the top wall and the bottom wall on the fixed mold gradually increases. Specifically, the second elastic member 316 can be one of a coil spring, an elastic rubber and an elastic plate.

[0043] Specifically, the driving rod 32 passes through the stripping cover plate 314 and the stripping plate 315 and is slidably matched with the stripping cover plate 314 and the stripping plate 315 respectively.

[0044] Optionally, a guide post is provided on the side of the stripping cover plate 314 away from the stripping plate 315 along the vertical direction Y. The guide post is sequentially passed through the upper clamping plate 313, the upper pad 312 and the upper die base 311, and the guide post is respectively slidably engaged with the upper clamping plate 313, the upper pad 312 and the upper die base 311. In this embodiment, this arrangement allows the stripping cover plate 314 and the stripping plate 315 to move relative to the upper clamping plate 313 only along the vertical direction Y, thereby preventing the stripping cover plate 314 and the stripping plate 315 from moving relative to the upper clamping plate 313 in the horizontal direction.

[0045] Optionally, the lower mold 1 includes a lower mold base 11, a lower pad 12 and a lower template 13 stacked in sequence along the vertical direction Y, and the side of the lower template 13 away from the lower pad 12 is the top wall of the lower mold 1. In this embodiment, the lower template 13 is recessed with a through hole along the vertical direction Y, and the through hole and the lower pad 12 are surrounded by a receiving groove 131. A channel 133 is provided next to the through hole, and the plug hole 132 connects the channel 133 and the receiving groove 131. The slider 21 is located in the receiving groove 131 and slides on the lower pad 12. The lower pad 12 is made of hard material, which can improve the durability of the lower mold 1. The lower mold base 11, the lower pad 12 and the lower template 13 are fixed to each other by bolts.

[0046] Exemplarily, the workpiece 100 to be punched includes a first plate 101 and a second plate 102, which are connected to form an L-shape. When punching a hole in the first plate 101, the lower die base 11 of the side punching mold is first fixed to the fixed base of the punching machine, and the upper die base 311 is fixed to the driving base of the punching machine. The first plate 101 is attached to the side wall of the accommodating groove 131 where the plug hole 132 is set, and the punching position on the first plate 101 is opposite to the punch 23 along the axial direction of the punch 23. At this time, the second plate 102 is located on the top wall of the lower template 13, and the driving seat moves along the vertical direction Y toward the direction close to the fixed seat, thereby making the upper mold 31 approach the lower mold 1. In this process, the bottom wall of the stripping plate 315 is first fitted with the top wall of the lower template 13, and then the second plate 102 is clamped to achieve the fixation of the punching part 100. Subsequently, the upper mold base 311, the upper base plate and the upper clamping plate 313 continue to move toward the lower mold 1 until the upper mold base 315 is close to the lower mold 1. The clamping plate 313 and the stripping cover plate 314 are pressed tightly together. In the process of the upper clamping plate 313 and the stripping cover plate 314 approaching each other until they are pressed tightly, the second inclined surface 321 of the driving rod 32 and the first inclined surface 212 of the slider 21 fit together and slide relative to each other, thereby moving the slider 21 toward the direction close to the plug hole 132, so that the punch 23 passes through the first plate 101 and is inserted into the plug hole 132. At this point, the punching on the first plate 101 is completed, and the waste cut from the first plate 101 is discharged through the plug hole 132 and the channel 133. Finally, the upper die 31 and the lower die 1 are separated from each other, and the punching of the punching part 100 to be punched is completed. When the punch 23 gets stuck, the reaction force of the punch 23 is greater than the maximum supporting force of the gasket 22, and then the punch 23 breaks the gasket 22, and then the punch 23 enters the accommodating hole 211, preventing the slider 21 from getting stuck, thereby avoiding interference with the mold parts and causing greater damage to the mold, and reducing the risk factor for the operator.

[0047] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A side punching die, used for punching a part to be punched (100), characterized in that: include: A lower mold (1), wherein a top wall of the lower mold (1) is provided with a receiving groove (131) in a vertical direction (Y), and a side wall of the receiving groove (131) is provided with a plug hole (132); A punching assembly comprises a slider (21), a gasket (22) and a punch (23), wherein the slider (21) is arranged in the receiving groove (131), a receiving hole (211) is recessed in the side wall of the slider (21) opposite to the plug hole (132), the gasket (22) is fixedly connected to the slider (21) and covers the receiving hole (211), the punch (23) is fixedly connected to the gasket (22), the punch (23) is opposite to the receiving hole (211) along the axial direction of the punch (23), the part to be punched (100) is attached to the side wall of the receiving groove (131) and is located between the plug hole (132) and the punch (23), the plate strength of the gasket (22) is a, the plate strength of the part to be punched (100) is b, and the breaking strength of the punch (23) is c, b<a<c; A driving assembly drives the slider (21) to move so that the punch (23) passes through the part to be punched (100) and extends into the insertion hole (132).

2. The side punching die according to claim 1, characterized in that: The axis of the insertion hole (132) and the axis of the punch (23) are collinear.

3. The side punching die according to claim 1, characterized in that: The lower mold (1) is provided with a channel (133) along the vertical direction (Y), the channel (133) is communicated with the plug hole (132), and the channel (133) and the plug hole (132) are connected to form an L-shaped pipeline.

4. The side punching die according to claim 1, characterized in that: Along the axial direction of the punch (23), a first inclined surface (212) is provided on a side of the slider (21) away from the punch (23); The driving assembly includes an upper mold (31) and a driving rod (32). Along the vertical direction (Y), the bottom wall of the upper mold (31) is opposite to the top wall of the lower mold (1), one end of the driving rod (32) is fixed to the upper mold (31), and the upper mold (31) slides relative to the lower mold (1) along the vertical direction (Y) so that the other end of the driving rod (32) abuts against the first inclined surface (212) and slides relatively.

5. The side punching die according to claim 4, characterized in that: A second inclined surface (321) is provided at the other end of the driving rod (32), and the second inclined surface (321) can be fitted with the first inclined surface (212).

6. The side punching die according to claim 4, characterized in that: The driving assembly further comprises a first elastic member (33), wherein the first elastic member (33) is arranged between the sliding block (21) and the side wall where the plug hole (132) is located.

7. The side punching die according to claim 4, characterized in that: The upper mold (31) includes an upper mold base (311), an upper pad (312) and an upper clamping plate (313) stacked in sequence along the vertical direction (Y), and the other end of the driving rod (32) passes through the upper clamping plate (313) and abuts against the upper pad (312).

8. The side punching die according to claim 7, characterized in that: The upper mold (31) also includes a stripping cover plate (314), a stripping plate (315) and a second elastic member (316); the stripping cover plate (314) and the stripping plate (315) are stacked in sequence; the stripping cover plate (314) and the upper clamping plate (313) are connected with a second elastic member (316); and the side of the stripping plate (315) away from the stripping cover plate (314) is the bottom wall of the upper mold (31).

9. The side punching die according to claim 8, characterized in that: A guide column is provided along the vertical direction (Y) on the side of the stripping cover plate (314) away from the stripping plate (315), and the guide column is sequentially passed through the upper clamping plate (313), the upper pad (312) and the upper mold base (311), and the guide column is respectively slidably matched with the upper clamping plate (313), the upper pad (312) and the upper mold base (311).

10. The side punching die according to claim 1, characterized in that: The lower mold (1) comprises a lower mold base (11), a lower pad (12) and a lower mold plate (13) stacked in sequence along the vertical direction (Y), and the side of the lower mold plate (13) away from the lower pad (12) is the top wall of the lower mold (1).

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