Punching composite die

Abstract

The invention relates to the technical field of punching equipment, in particular to a punching composite die which comprises an upper die assembly and a lower die assembly, the upper die assembly comprises an upper die base and a punching female die, the punching female die is fixedly arranged on the lower end face of the upper die base, and an avoiding hole is formed in the punching female die in the vertical direction; the lower die assembly comprises a lower die base, a lower correcting die, an elastic piece and a punching punch, the lower correcting die is arranged on the upper end face of the lower die base and is in sliding fit with the lower die base in the vertical direction, the lower correcting die is provided with a through hole, the punching punch penetrates through the through hole, the length of the punching punch is larger than that of the through hole, and the lower correcting die is opposite to the punching female die. The avoiding hole is opposite to the punching punch, the elastic part drives the lower correcting die to move in the vertical direction, and the part to be punched is clamped between the lower correcting die and the punching female die. According to the punching composite die, the function that the wad is automatically separated from the avoiding hole is achieved, so that the normal work of the punching punch is not interfered, and the automatic construction of the punching composite die is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of punching equipment, and particularly relates to a punching compound die. BACKGROUND

[0002] Automobile light weight refers to reducing the overall quality of the automobile as much as possible under the premise of ensuring the strength and safety performance of the automobile, so as to improve the power performance of the automobile, reduce fuel consumption and reduce exhaust pollution. However, as an important security component of the automobile, the strength and rigidity of the front axle directly affect the safety and stability of the automobile during driving, and the light weight design of the front axle must ensure that the strength and rigidity of the front axle can meet the use requirements of the automobile.

[0003] In the light weight design of the front axle, it is a common weight reduction method to set a weight reduction hole on the front axle. However, the punching punch of the existing punching compound die is usually arranged on the upper die assembly. When the punching punch punches the front axle on the lower die assembly, the skin punched by the punching punch enters the escape hole of the lower die assembly together with the punching punch. If the skin in the escape hole is not cleaned in time, it will interfere with the work of the punching punch, which is not conducive to the automation construction of the punching compound die.

[0004] Therefore, there is an urgent need for a punching compound die to solve the above problems. SUMMARY

[0005] The present application aims to provide a punching compound die to solve the problem in the related art that when the punching punch punches the front axle on the lower die assembly, the skin punched by the punching punch enters the escape hole of the lower die assembly together with the punching punch, and if the skin in the escape hole is not cleaned in time, it will interfere with the work of the punching punch, which is not conducive to the automation construction of the punching compound die.

[0006] The present application provides a punching compound die, which comprises:

[0007] The upper die assembly comprises an upper die seat and a punching female die, the punching female die is fixedly arranged on the lower end surface of the upper die seat, and the punching female die is provided with an escape hole in the vertical direction;

[0008] The lower die assembly is arranged below the upper die assembly along the vertical direction, and comprises a lower die base, a lower correction die, an elastic member and a punching punch. The lower correction die is arranged on the upper end surface of the lower die base and is slidingly fitted with the lower die base along the vertical direction. The lower correction die is provided with a through hole along the vertical direction. The punching punch is slidingly arranged in the through hole. The length of the punching punch is greater than the length of the through hole. The lower correction die is opposite to the punching die. The avoiding hole is opposite to the punching punch. The elastic member has a driving trend of moving the lower correction die along the vertical direction and clamps the to-be-punched part between the lower correction die and the punching die.

[0009] As a preferred technical scheme of the punching composite die, the lower correction die comprises a sliding plate and a lower die body. The sliding plate is arranged on the lower die base and is slidingly fitted with the lower die base along the vertical direction. The lower die body is fixedly arranged on the side of the sliding plate away from the lower die base. The sliding plate and the lower die body are respectively provided with a first hole and a second hole. The first hole and the second hole constitute the through hole. The elastic member is arranged between the sliding plate and the lower die base.

[0010] As a preferred technical scheme of the punching composite die, the lower die assembly further comprises a lower backing plate. The lower backing plate is fixedly arranged on the upper end surface of the lower die base and is located between the lower die base and the sliding plate.

[0011] As a preferred technical scheme of the punching composite die, the sliding plate is provided with a guide hole along the vertical direction.

[0012] The lower die assembly further comprises a guide rod. The guide rod is fixedly connected with the lower backing plate and is arranged in the guide hole.

[0013] As a preferred technical scheme of the punching composite die, the lower backing plate comprises a backing plate part and a stamping part. The backing plate part is provided with a mounting through hole along the vertical direction. The stamping part is arranged in the mounting through hole. The backing plate part is fixedly arranged on the lower die base. The through hole is opposite to the stamping part.

[0014] As a preferred technical scheme of the punching composite die, the elastic member is a nitrogen gas spring. One end of the nitrogen gas spring is fixedly connected with the lower backing plate. The other end of the nitrogen gas spring is fixedly connected with the sliding plate.

[0015] As a preferred technical scheme of the punching composite die, the punching die comprises an upper backing plate and an upper die body fixedly arranged on the upper backing plate. The upper backing plate is fixedly arranged on the upper die base. The avoiding hole is located on the upper die body. The upper die body and the lower correction die clamp the to-be-punched part.

[0016] As the preferred technical scheme of the punching composite die, the limiting assembly comprises an upper limiting column and a lower limiting column, the upper limiting column is fixedly arranged on the upper die seat, the lower limiting column is fixedly arranged on the lower die seat, and the upper limiting column and the lower limiting column are oppositely arranged along the vertical direction.

[0017] As the preferred technical scheme of the punching composite die, the lower limiting column comprises a column body, a bolt and a plurality of gaskets, one end of the column body is fixedly arranged on the lower die seat, the other end of the column body is provided with a threaded hole opposite to the upper limiting column, the bolt is inserted into the threaded hole and is screwed with the lower limiting column, and at least one gasket is sleeved on the stud of the bolt.

[0018] As the preferred technical scheme of the punching composite die, the punching punch head comprises a blade portion, and a projection of the blade portion along the horizontal direction is in a V shape.

[0019] The beneficial effects of the present application are as follows:

[0020] The present application provides a punching compound die, which comprises an upper die assembly and a lower die assembly, the upper die assembly comprises an upper die seat and a punching female die, the punching female die is fixedly arranged on the lower end surface of the upper die seat, and the punching female die is provided with a relief hole in the vertical direction; the lower die assembly is arranged below the upper die assembly in the vertical direction and comprises a lower die seat, a lower correction die, an elastic member and a punching punch, the lower correction die is arranged on the upper end surface of the lower die seat and is in sliding fit with the lower die seat in the vertical direction, the lower correction die is provided with a through hole in the vertical direction, the punching punch is slidingly arranged in the through hole, the length of the punching punch is greater than the length of the through hole, the lower correction die is opposite to the punching female die, the relief hole is opposite to the punching punch, the elastic member has a driving trend of moving the lower correction die in the vertical direction and clamps the to-be-punched part between the lower correction die and the punching female die. When the to-be-punched part needs to be punched, the to-be-punched part is arranged between the lower correction die and the punching female die, at this time, the lower correction die is driven by the elastic member to move in the vertical direction towards the punching female die, thereby realizing that the lower correction die and the punching female die clamp and fix the to-be-punched part, and at this time, the lower correction die and the lower die seat have a gap, then the upper die seat is driven to move towards the lower die seat, at this time, the upper die assembly, the to-be-punched part and the lower correction die move in the vertical direction towards the lower die seat, because the length of the punching punch is greater than the length of the through hole and the lower die seat supports the punching punch, the punching punch extends out of the through hole and realizes punching on the to-be-punched part, the punched skin enters the relief hole together with the punching punch, after the punching is completed, the force applied to the upper die seat is removed, at this time, the elastic member drives the upper die assembly, the to-be-punched part and the lower correction die to move in the vertical direction away from the lower die seat, the punching punch is separated from the relief hole, and the skin can be automatically separated from the relief hole under the action of gravity. The punching compound die realizes the function that the skin is automatically separated from the relief hole, thereby not interfering with the normal work of the punching punch, which is beneficial to the automation construction of the punching compound die. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a punching compound die in the prior art;

[0022] Figure 2 It is a structural schematic diagram of a punching compound die in the embodiment of the present application;

[0023] Figure 3 It is a structural schematic diagram of an upper die body in the embodiment of the present application;

[0024] Figure 4 It is a structural schematic diagram of a lower die body in the embodiment of the present application;

[0025] Figure 5 It is a structural schematic diagram of a punching punch in the embodiment of the present application;

[0026] Figure 6A structure schematic diagram of a to-be-punched part in the embodiment of the present application.

[0027] In the drawings:

[0028] Z, vertical direction;

[0029] 1, upper die assembly; 11, upper die seat; 12, punching female die; 121, upper backing plate; 122, upper die body; 1221, avoiding hole;

[0030] 2, lower die assembly; 21, lower die seat; 22, lower correction die; 221, sliding plate; 222, lower die body; 223, through hole; 2231, first hole; 2232, second hole; 23, elastic member; 24, punching punch; 241, blade portion; 25, lower backing plate; 251, backing plate portion; 252, stamping portion; 26, guide rod;

[0031] 3, limiting assembly; 31, upper limiting column; 32, lower limiting column; 321, column body; 322, bolt; 323, gasket;

[0032] 100, to-be-punched part; 101, I-beam web; 1011, elliptical hole; 1012, skin; 102, knuckle; 103, kingpin. DETAILED DESCRIPTION

[0033] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "above", "above" and "above" of the first feature to the second feature include the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] like Figure 1 As shown, in the prior art, the punching punch 24 of the punching compound mold is usually set on the upper mold assembly 1. When the punching punch 24 punches the workpiece 100 to be punched on the lower mold assembly 2, the connecting skin 1012 punched down by the punching punch 24 enters the clearance hole 1221 of the lower mold assembly 2 together with the punching punch 24. If the connecting skin 1012 in the clearance hole 1221 is not cleaned in time, it will interfere with the operation of the punching punch 24, which is not conducive to the automation of the punching compound mold.

[0038] To solve the above problems, such as Figures 2 to 6As shown, the embodiment provides a punching compound die, which comprises an upper die assembly 1 and a lower die assembly 2. The upper die assembly 1 comprises an upper die seat 11 and a punching female die 12, the punching female die 12 is fixedly arranged on the lower end surface of the upper die seat 11, and the punching female die 12 is provided with a relief hole 1221 in the vertical direction Z. The lower die assembly 2 is arranged below the upper die assembly 1 in the vertical direction Z, and comprises a lower die seat 21, a lower correction die 22, an elastic element 23 and a punching punch 24. The lower correction die 22 is arranged on the upper end surface of the lower die seat 21 and is slidingly matched with the lower die seat 21 in the vertical direction Z. The lower correction die 22 is provided with a through hole 223 in the vertical direction Z, and the punching punch 24 is slidingly arranged in the through hole 223. The length of the punching punch 24 is greater than the length of the through hole 223. The lower correction die 22 is opposite to the punching female die 12, and the relief hole 1221 is opposite to the punching punch 24. The elastic element 23 has a driving trend of moving the lower correction die 22 in the vertical direction Z, and clamps the to-be-punched part 100 between the lower correction die 22 and the punching female die 12. When it is needed to punch the to-be-punched part 100, the to-be-punched part 100 is arranged between the lower correction die 22 and the punching female die 12. At this time, the lower correction die 22 is driven by the elastic element 23 to move in the vertical direction Z to the direction close to the punching female die 12, so as to realize the clamping and fixing of the to-be-punched part 100 by the lower correction die 22 and the punching female die 12. At this time, there is a gap between the lower correction die and the lower die seat 21. Then, the upper die seat 11 is driven to move to the direction close to the lower die seat 21. At this time, the upper die assembly 1, the to-be-punched part 100 and the lower correction die 22 move in the vertical direction Z to the direction close to the lower die seat 21. Since the length of the punching punch 24 is greater than the length of the through hole 223 and the lower die seat 21 supports the punching punch 24, the punching punch 24 extends out of the through hole 223 and realizes punching on the to-be-punched part 100. The punched skin 1012 enters the relief hole 1221 together with the punching punch 24. After punching, the force applied to the upper die seat 11 is removed. At this time, the elastic element 23 drives the upper die assembly 1, the to-be-punched part 100 and the lower correction die 22 to move in the vertical direction Z to the direction away from the lower die seat 21. The punching punch 24 is withdrawn from the relief hole 1221. The skin 1012 can be automatically withdrawn from the relief hole 1221 under the action of gravity. The punching compound die realizes the function of automatically separating the skin 1012 from the relief hole 1221, so as to not interfere with the normal work of the punching punch 24, which is beneficial to the automation construction of the punching compound die.

[0039] Optionally, the lower correction die 22 comprises a sliding plate 221 and a lower die body 222, the sliding plate 221 is arranged on the lower die seat 21 and is slidably connected with the lower die seat 21 along the vertical direction Z, the lower die body 222 is fixedly arranged on the side of the sliding plate 221 away from the lower die seat 21, the sliding plate 221 and the lower die body 222 are respectively provided with a first hole 2231 and a second hole 2232, the first hole 2231 and the second hole 2232 form a through hole 223, and the elastic member 23 is arranged between the sliding plate 221 and the lower die seat 21. In the embodiment, since the lower die body 222 directly contacts the to-be-punched part 100, the lower die body 222 is a consumable part, therefore, the sliding plate 221 and the lower die body 222 are detachably connected, thereby the maintenance cost of the punching composite die can be reduced. In addition, the sliding plate 221 can reduce the size of the lower die body 222 along the vertical direction Z, thereby the production cost of the lower die body 222 can be reduced.

[0040] Optionally, the lower die assembly 2 further comprises a lower backing plate 25, the lower backing plate 25 is fixedly arranged on the upper end surface of the lower die seat 21 and is located between the lower die seat 21 and the sliding plate 221. In the embodiment, the lower backing plate 25 supports the punching punch 24, when the lower die assembly 2 moves downward together with the to-be-punched part 100, the punching punch 24 directly abuts against the lower backing plate 25, so as to realize the supporting effect of the lower backing plate 25 on the punching punch 24, since the impact force between the punching punch 24 and the lower backing plate 25 is large, the lower backing plate 25 can protect the lower die seat 21. Optionally, the lower backing plate 25 and the lower die seat 21 are detachably connected.

[0041] Optionally, the sliding plate 221 is provided with a guide hole along the vertical direction Z; the lower die assembly 2 further comprises a guide rod 26, the guide rod 26 is fixedly connected with the lower backing plate 25 and is arranged in the guide hole. In the embodiment, the axis of the guide rod 26 is arranged along the vertical direction Z, therefore, the sliding plate 221 can slide along the vertical direction Z relative to the lower backing plate 25 along the guide rod 26.

[0042] Optionally, a sliding bearing can be arranged in the guide hole, and the guide rod 26 is arranged in the sliding bearing. In the embodiment, when the sliding plate 221 slides relative to the guide rod 26, the arrangement can effectively improve the problem of jamming of the sliding plate 221 relative to the guide rod 26.

[0043] Optionally, the guide rod 26 is provided with at least three guide rods, the guide hole is provided with at least three guide holes, and the guide rod 26 and the guide hole are arranged one by one.

[0044] Optionally, the lower base plate 25 comprises a base plate part 251 and a punching part 252, the base plate part 251 is provided with a mounting through hole in the vertical direction Z, the punching part 252 is arranged in the mounting through hole, and the base plate part 251 is fixedly arranged on the lower die seat 21, and the through hole 223 is opposite to the punching part 252. In this embodiment, the base plate part 251 is fixedly arranged on the lower die seat 21, and after the punching part 252 is arranged in the mounting through hole, the base plate part 251 is fixed to the punching part 252, the punching punch 24 directly abuts against the punching part 252, and when the punching part 252 is damaged, the punching part 252 can be directly replaced, without the need to replace the entire lower base plate 25, thereby reducing the maintenance cost in the later period.

[0045] Optionally, the mounting through hole is a two-stage stepped hole, the diameter of the first-stage stepped hole close to the lower die seat 21 is greater than the diameter of the second-stage stepped hole close to the sliding plate 221, and the punching part 252 is a two-stage stepped column, the diameter of the first-stage stepped column is consistent with the diameter of the first-stage stepped hole, and the diameter of the second-stage stepped column is consistent with the diameter of the second-stage stepped hole. In this embodiment, when the base plate part 251 is fixedly arranged on the lower die seat 21, the punching part 252 is fixedly arranged on the base plate part 251 in the vertical direction Z.

[0046] Optionally, the elastic member 23 is a nitrogen spring, one end of the nitrogen spring is fixedly connected with the lower base plate 25, and the other end of the nitrogen spring is fixedly connected with the sliding plate 221. In this embodiment, the nitrogen spring realizes elastic action through compression and expansion of high-pressure nitrogen gas, and compared with a traditional metal spring or a rubber component, the nitrogen spring has a smaller volume but a greater elastic force, and can satisfy synchronous movement of the upper die assembly 1, the to-be-punched part 100 and the lower correction die 22 in the vertical direction Z away from the lower die seat 21. At the same time, the nitrogen spring runs stably and has no vibration, the elastic force output curve of the nitrogen spring is gentle, the nitrogen spring can avoid uneven stress of the sliding plate 221, and can avoid causing the sliding plate 221 to be stuck relative to the guide rod 26.

[0047] Optionally, the nitrogen spring is provided with at least three.

[0048] Optionally, the punching female die 12 comprises an upper base plate 121 and an upper die body 122 fixedly arranged on the upper base plate 121, the upper base plate 121 is fixedly arranged on the upper die seat 11, the avoiding hole 1221 is arranged on the upper die body 122, and the upper die body 122 and the lower correction die 22 clamp the to-be-punched part 100. In this embodiment, since the upper die body 122 directly contacts the to-be-punched part 100, the upper die body 122 is a consumable part, and therefore, the upper base plate 121 and the upper die body 122 are detachably connected, thereby reducing the maintenance cost of the punching compound die. In addition, the upper base plate 121 can reduce the size of the upper die body 122 in the vertical direction Z, thereby reducing the production cost of the upper die body 122.

[0049] Optionally, the piercing composite die further comprises a limiting assembly 3, the limiting assembly 3 comprises an upper limiting column 31 and a lower limiting column 32, the upper limiting column 31 is fixedly arranged on the upper die seat 11, the lower limiting column 32 is fixedly arranged on the lower die seat 21, and the upper limiting column 31 and the lower limiting column 32 are oppositely arranged along the vertical direction Z. In the embodiment, when the upper die assembly 1 approaches the lower die assembly 2, the upper limiting column 31 and the lower limiting column 32 abut, at this time, the piercing punch 24 just penetrates through the to-be-pierced part 100 and is arranged in the avoiding hole 1221.

[0050] Optionally, if the avoiding hole 1221 is a blind hole, when the upper limiting column 31 and the lower limiting column 32 abut, the piercing punch 24 at this time is spaced apart from the bottom wall of the avoiding hole 1221.

[0051] Optionally, the lower limiting column 32 comprises a column body 321, a bolt 322 and a plurality of gaskets 323, one end of the column body 321 is fixedly arranged on the lower die seat 21, the other end of the column body 321 is provided with a threaded hole opposite to the upper limiting column 31, the bolt 322 is inserted into the threaded hole and is screwed with the lower limiting column 32, and at least one gasket 323 is sleeved on the shank of the bolt 322. In the embodiment, by sleeving different numbers of gaskets 323 on the shank, and then screwing the bolt 322, the head and the column body 321 clamp the gaskets 323 on the shank, so as to adjust the length of the lower limiting column 32, so as to adapt to different to-be-pierced parts 100.

[0052] Optionally, the piercing punch 24 comprises a blade edge portion 241, and the projection of the blade edge portion 241 along the horizontal direction is V-shaped. In the embodiment, compared with the projection of the blade edge portion 241 along the horizontal direction being in the shape of a straight line, the straight-line-shaped blade edge portion 241 realizes the simultaneous piercing of the to-be-pierced region of the to-be-pierced part 100, while the V-shaped blade edge portion 241 realizes the piercing of both ends of the to-be-pierced region of the to-be-pierced part 100 first and the middle part later, so that the V-shaped blade edge portion 241 makes the deformation amount of the to-be-pierced part 100 smaller.

[0053] Optionally, the to-be-pierced part 100 can be a front axle of a vehicle, the front axle comprises an I-beam web 101 and a knuckle 102 and a kingpin 103 arranged at both ends of the I-beam web 101, and the weight of the front axle can be reduced by piercing the I-beam web 101. In addition, the thickness of the I-beam web 101 is thinned, so that the oval holes 1011 completely symmetrical along the center of the I-beam web 101 can be punched out at the position of the I-beam web 101.

[0054] Obviously, the above embodiments of the present application are merely example for clearly explaining the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A punching composite die, characterized in that, include: The upper die assembly (1) includes an upper die base (11) and a punching die (12). The punching die (12) is fixed to the lower end face of the upper die base (11). The punching die (12) is provided with a clearance hole (1221) along the vertical direction (Z). The lower die assembly (2) is disposed below the upper die assembly (1) along the vertical direction (Z), and includes a lower die base (21), a lower straightening die (22), an elastic element (23), and a punching punch (24). The lower straightening die (22) is disposed on the upper end face of the lower die base (21) and slides relative to the lower die base (21) along the vertical direction (Z). The lower straightening die (22) is provided with a through hole (223) along the vertical direction (Z), and the punching punch (24) slides through the hole. Located in the through hole (223), the length of the punch (24) is greater than the length of the through hole (223). The lower correction die (22) is opposite to the punch die (12), the clearance hole (1221) is opposite to the punch (24), and the elastic member (23) has the tendency to drive the lower correction die (22) to move along the vertical direction (Z) and clamp the part to be punched (100) between the lower correction die (22) and the punch die (12).

2. The punching composite mold according to claim 1, characterized in that, The lower correction mold (22) includes a sliding plate (221) and a lower mold body (222). The sliding plate (221) is disposed on the lower mold base (21) and slides relative to the lower mold base (21) in the vertical direction (Z). The lower mold body (222) is fixed on the side of the sliding plate (221) away from the lower mold base (21). The sliding plate (221) and the lower mold body (222) are respectively provided with a first hole (2231) and a second hole (2232). The first hole (2231) and the second hole (2232) form the through hole (223). The elastic element (23) is disposed between the sliding plate (221) and the lower mold base (21).

3. The punching composite mold according to claim 2, characterized in that, The lower mold assembly (2) also includes a lower pad (25), which is fixed to the upper end face of the lower mold base (21) and located between the lower mold base (21) and the sliding plate (221).

4. The punching composite die according to claim 3, characterized in that, The sliding plate (221) is provided with guide holes along the vertical direction (Z); The lower mold assembly (2) also includes a guide rod (26), which is fixedly connected to the lower pad (25) and passes through the guide hole.

5. The punching composite die according to claim 4, characterized in that, The lower pad (25) includes a pad portion (251) and a stamping portion (252). The pad portion (251) is provided with a mounting through hole along the vertical direction (Z). The stamping portion (252) passes through the mounting through hole. The pad portion (251) is fixed to the lower die base (21). The through hole (223) is opposite to the stamping portion (252).

6. The punching composite die according to claim 4, characterized in that, The elastic element (23) is a nitrogen spring. One end of the nitrogen spring is fixedly connected to the lower pad (25), and the other end of the nitrogen spring is fixedly connected to the sliding plate (221).

7. The punching composite die according to claim 1, characterized in that, The punching die (12) includes an upper pad (121) and an upper die body (122) fixed on the upper pad (121). The upper pad (121) is fixed on the upper die base (11). The clearance hole (1221) is located on the upper die body (122). The upper die body (122) and the lower correction die (22) clamp the part to be punched (100).

8. The punching composite die according to any one of claims 1-7, characterized in that, It also includes a limiting component (3), which includes an upper limiting post (31) and a lower limiting post (32). The upper limiting post (31) is fixed to the upper mold base (11), and the lower limiting post (32) is fixed to the lower mold base (21). The upper limiting post (31) and the lower limiting post (32) are arranged opposite to each other along the vertical direction (Z).

9. The punching composite die according to claim 8, characterized in that, The lower limit post (32) includes a post body (321), a bolt (322) and a plurality of washers (323). One end of the post body (321) is fixed to the lower mold base (21). The other end of the post body (321) is provided with a threaded hole on the surface opposite to the upper limit post (31). The bolt (322) extends into the threaded hole and is screwed to the lower limit post (32). At least one washer (323) is sleeved on the stud of the bolt (322).

10. The punching composite die according to any one of claims 1-7, characterized in that, The punch (24) includes a cutting edge (241), the projection of which along the horizontal direction is V-shaped.

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