Multi-layer pull rod composite punch quick-changing structure and die

Abstract

The utility model relates to the technical field of dies, in particular to a multi-layer pull rod composite punch quick-changing structure and a die, the multi-layer pull rod assembly comprises at least three layers of pull rods which are arranged in a stacked mode in the first direction, and the pull rods are arranged in the die in a sliding mode in the second direction; the composite punch assembly comprises a plurality of forming punches, and the punching direction of each forming punch is arranged in the first direction; and the anti-interference structure is arranged on the pull rod located on the middle layer, so that the pull rod located on the middle layer does not interfere with the forming punches controlled by other pull rods when sliding in the second direction. The multi-layer pull rod structure and the multiple forming punches are integrated in the same space, the multiple forming punches can be rapidly switched at the same time, part style changing with or without composite characteristic primitives can be achieved without disassembling, assembling and replacing the punches by the die, the style changing production time is greatly shortened, and the die switching efficiency and the production efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a quick-change structure and mold for a multi-layer tie rod composite punch. Background Technology

[0002] To meet production demands and save on production costs, a single mold may need to accommodate the production needs of multiple products with similar structures. When handling different parts of the product structure, such a mold involves a quick-change punch structure. Traditional quick-change structures can only switch between punches for forming single feature elements. However, composite feature elements with multiple feature elements require multiple forming punches for forming. Each forming punch also needs a corresponding punch structure to achieve the production of composite feature elements. Therefore, during production changes, the mold needs to be disassembled and replaced with different punches to meet the production requirements of composite feature elements.

[0003] like Figure 1 and Figure 2 As shown, the only difference between part A and part B is the presence or absence of the composite feature element C. The forming of this composite feature element C requires two punches: a die-cutting tool and a punch. For example... Figure 3 and Figure 4 As shown, the existing mold for processing composite feature element C has two types of punches: pressing and punching. The pressing and punching are formed in a specific order by the position of each punch and the design of a special structure. First, the protrusion is pressed and formed, and then the punching is completed. When switching between the production of parts A and B, the mold needs to be removed from the machine and the punches need to be disassembled to achieve the change. This results in low mold switching efficiency when the production of parts involving the presence or absence of composite feature element C is changed. Utility Model Content

[0004] This utility model provides a multi-layer tie rod composite punch quick-change structure and mold to solve the technical problem that the existing quick-change mold structure can only switch forming punches for single feature elements, resulting in low mold switching efficiency when changing parts involving composite feature elements.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, this utility model provides a quick-change structure for a multi-layer tie rod composite punch, comprising:

[0007] A multi-layer tie rod assembly includes at least three layers of tie rods, which are stacked along a first direction, and each tie rod is slidably disposed in a mold along a second direction.

[0008] A composite punch assembly includes multiple forming punches, each forming punch having its stamping direction along a first direction. The non-forming ends of the forming punches respectively cooperate with corresponding pull rods. Sliding of the pull rods along a second direction allows the corresponding forming punches to participate in or not participate in stamping. The forming punches include forming punches or punching punches.

[0009] The anti-interference structure is provided on the tie rod located in the middle layer, forming a cavity through which the forming punch controlled by other tie rods passes, so that the tie rod in the middle layer does not interfere with the forming punch controlled by other tie rods when sliding in the second direction.

[0010] In one embodiment, each of the tie rods is provided with a clearance structure along the first direction.

[0011] In one embodiment, the edge of the clearance structure is provided with a guide structure, which is an inclined surface or a sliding guide mechanism, and the non-forming end of the forming punch is provided with a punch inclined surface or arc surface that cooperates with the guide structure.

[0012] In one embodiment, the composite punch assembly further includes an elastic element that presses the forming punch against the corresponding pull rod. The elastic element and the forming punch are disposed on the same side of the pull rod, with one end of the elastic element pressing against the forming punch and the other end pressing against the mold.

[0013] In one embodiment, each of the pull rods has a connecting portion at its end, the connecting portion being used to connect to a drive mechanism that drives the pull rod to slide in a second direction.

[0014] In one embodiment, when the multi-layer tie rod assembly includes three layers of tie rods, the first tie rod is used to control whether the punching punch participates in the punching or not, the second tie rod is used to control whether the die punch of the forming punch participates in the punching or not, and the third tie rod is used to control whether the punch of the forming punch participates in the punching or not. The first tie rod, the second tie rod, and the punching punch are located above the upper ejector plate of the mold, the die punch is located inside the upper ejector plate, and the punch is located inside the lower template and the lower backing plate of the mold.

[0015] In one embodiment, the third tie rod is provided with a material discharge through hole at the corresponding position of the punching hole.

[0016] In one embodiment, the anti-interference structure is a U-shaped notch provided at the front end of the pull rod, the U-shaped notch extending along the sliding direction of the pull rod.

[0017] In one embodiment, the multi-layer tie rod composite punch quick-change structure further includes a locking structure for locking the sliding position of the tie rod.

[0018] Secondly, this utility model provides a mold, including the multi-layer tie rod composite punch quick-change structure as described above.

[0019] Compared with the prior art, the advantages of this utility model are that by integrating a multi-layer tie rod structure and multiple forming punches in the same space, this utility model can achieve simultaneous and rapid switching of multiple forming punches. It can realize the change of parts with and without composite feature elements without the need for mold removal and punch replacement, which greatly shortens the change of production time and improves the mold switching efficiency and production efficiency. Attached Figure Description

[0020] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0021] Figure 1 This is a structural schematic diagram of part A, which lacks composite element features.

[0022] Figure 2 This is a structural schematic diagram of part B, which has composite graphic element features.

[0023] Figure 3 This diagram illustrates the forming process of a mold without a quick-change structure for machining parts with composite graphic features, as described in existing technologies. Figure 1 ;

[0024] Figure 4 This diagram illustrates the forming process of a mold without a quick-change structure for machining parts with composite graphic features, as described in existing technologies. Figure 2 ;

[0025] Figure 5 A three-dimensional structural diagram of the multi-layer tie rod composite punch quick-change structure provided in the embodiment of this utility model;

[0026] Figure 6 This is a schematic diagram showing the first lever in the pushed-in state;

[0027] Figure 7 for Figure 6 A magnified view of a portion of point D in the middle;

[0028] Figure 8 This is a schematic diagram showing the first lever in the extended position.

[0029] Figure 9 A schematic diagram of the mold structure with the tie rod fully pushed in;

[0030] Figure 10 for Figure 9 A magnified view of a portion of point E in the middle;

[0031] Figure 11 A schematic diagram of the mold structure with the tie rod fully extended;

[0032] Figure 12 A schematic diagram of the mold structure of a multi-layer tie rod composite punch quick-change structure with elastic elements for composite punch assembly when the tie rods are fully extended.

[0033] Figure 13 This is a schematic diagram showing the installation location of the locking structure.

[0034] Figure label:

[0035] C. Composite feature primitives;

[0036] 1. Upper mold base;

[0037] 2. First pull rod;

[0038] 3. Install the upper clamp;

[0039] 4. Upper stop plate;

[0040] 5. Second tie rod; 5-1. U-shaped notch;

[0041] 6. Remove the upper plate;

[0042] 7. Download the template;

[0043] 8. Lower pad;

[0044] 9. Third tie rod; 9-1. Material discharge through hole;

[0045] 10. Lower mold base;

[0046] 11. Punch; 11-1. Punch bevel;

[0047] 12. Die punch;

[0048] 13. Parts;

[0049] 14. Punch;

[0050] 15. Spring;

[0051] 16. Equal-height sleeve;

[0052] 17. Connecting part;

[0053] 18. Incline;

[0054] 19. Locking pin. Detailed Implementation

[0055] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0056] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] In the description of this utility model, 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; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0058] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0059] To facilitate understanding, the specific details of the existing technology are explained further below:

[0060] The structure of the mold for processing part B with composite primitive feature C in the existing technology is as follows: Figure 3As shown, this mold is a mold without a quick-change structure, only suitable for forming feature products with composite graphic element feature C, that is, only suitable for forming part B. When processing part A, it needs to be replaced. The mold consists of, from top to bottom, an upper mold base 1, an upper clamping plate 3, an upper stop plate 4, an upper ejector plate 6, a lower template 7, a lower pad plate 8, and a lower mold base 10. Among them, the upper mold base 1 and the upper clamping plate 3 are fixedly connected, and the upper clamping plate 3 is provided with a punching punch 11, the non-forming end of which abuts against the upper mold base 1; the upper stop plate 4 and the upper ejector plate 6 are fixedly connected, and the upper ejector plate 6 is provided with a die punch 12, the non-forming end of which abuts against the upper stop plate 4; an equal-height sleeve 16 is provided between the upper mold base 1 and the upper ejector plate 6, and a spring 15 is provided between the upper mold base 1 and the upper stop plate 4; by setting the spring 15 and the equal-height sleeve 16, a mold can be formed. The distance between the sleeve 16, the upper stop plate 4, the upper ejector plate 6 assembly and the upper mold base 1, the upper clamping plate 3 assembly can be compressed and reset; the lower template 7, the lower pad plate 8 and the lower mold base 10 are fixedly connected, and a punch 14 that cooperates with the die punch 12 is provided between the lower template 7 and the lower pad plate 8. The die punch 12 and the punch 14 together constitute a forming punch, used to form a convex shape on part B. The punching punch 11 cooperates with the punch 14 for punching holes in part B. Figure 3 and Figure 4 The forming process shown requires processing part B with composite graphic element feature C. The machine needs to be stopped and the original mold replaced with the composite stamping mold described above. Then, part 13 is placed between the upper ejector plate 6 and the lower template 7, and the stamping machine is operated to stamp. During the mold closing process, the upper stop plate 4 presses onto the upper ejector plate 6 assembly first. Part 13 first contacts the punch 14 and the die 12. At this time, the die 12 and the punch 14 work together to press part 13 into a protrusion. The mold continues to close, the spring 15 is compressed, and the distance between the upper clamping plate 3 and the upper stop plate 4 is compressed until they fit together. The punching punch 11 presses down and works together with the punch 14 to punch part 13. Finally, the stamping forming of composite graphic element feature C is achieved.

[0061] When alternating between producing part A and part B, the machine needs to be stopped to disassemble and replace the mold, resulting in a long changeover time. The existing quick-change mold structure can only switch the forming punch for a single feature element. For example, the existing quick-change mold structure can only quickly change whether the punching punch 11 participates in the stamping process.

[0062] Therefore, this utility model provides a multi-layer tie rod composite punch quick-change structure and mold to solve the technical problem that the existing quick-change mold structure can only switch forming punches for a single feature element, resulting in low mold switching efficiency when changing parts involving the presence or absence of composite feature element C.

[0063] To achieve the above objectives, the present invention adopts the following technical solution:

[0064] Example 1

[0065] This utility model provides a multi-layer tie rod composite punch quick-change structure, including a multi-layer tie rod assembly, a composite punch assembly, and an anti-interference structure. The multi-layer tie rod assembly includes at least three layers of tie rods stacked along a first direction, with each tie rod slidably disposed in a mold along a second direction. The composite punch assembly includes multiple forming punches, each forming punch having its stamping direction along the first direction. The non-forming ends of the forming punches respectively cooperate with corresponding tie rods. The sliding of the tie rods along the second direction allows the corresponding forming punches to participate in stamping or not participate in stamping. The forming punches include forming punches or punching punches. The anti-interference structure is provided on the tie rods in the middle layer, forming cavities through which forming punches controlled by other tie rods pass, ensuring that the tie rods in the middle layer do not interfere with the forming punches controlled by other tie rods when sliding along the second direction.

[0066] In this embodiment, the stamping and mold closing of the mold along the vertical direction is used as an example for illustration. In other embodiments, the stamping and mold closing of the mold along the horizontal direction or along other angles can also be used.

[0067] Specifically, such as Figure 5 and Figure 9 As shown, when the multi-layer tie rod assembly includes three layers of tie rods, the three layers of tie rods in each tie rod include a first tie rod 2, a second tie rod 5, and a third tie rod 9 arranged sequentially from top to bottom. The vertical direction is the first direction, and the horizontal direction is the second direction. The first tie rod 2 is used to control whether the punching punch 11 participates in the punching or not. The second tie rod 5 is used to control whether the die punch 12 of the forming punch participates in the punching or not. The third tie rod 9 is used to control whether the punch 14 of the forming punch participates in the punching or not. The first tie rod 2, the second tie rod 5, and the punching punch 11 are located above the upper ejector plate 6 of the mold. The die punch 12 is located inside the upper ejector plate 6, and the punch 14 is located inside the lower template 7 and the lower backing plate 8 of the mold.

[0068] like Figure 9 , Figure 10 and Figure 11 As shown, the first pull rod 2 is located between the upper mold base 1 and the upper clamping plate 3, and the front end of the first pull rod 2 is provided with a relief structure. When the first pull rod 2 is pushed in, the non-forming end of the punch 11 abuts against the first pull rod 2, and the punch 11 pushes downward, participating in the stamping process. When the first pull rod 2 is pulled out, the non-forming end of the punch 11 is opposite to the relief structure of the first pull rod 2, and the punch 11 is not subjected to the pressure of the first pull rod 2. At this time, even if the mold is pressed down, the punch 11 does not participate in the stamping process.

[0069] like Figure 9 , Figure 10 and Figure 11 As shown, the second pull rod 5 is located between the upper stop plate 4 and the upper release plate 6. The front end of the second pull rod 5 is provided with a relief structure. When the second pull rod 5 is pushed in, the non-forming end of the die punch 12 of the forming punch abuts against the second pull rod 5, and the die punch 12 pushes downward, participating in the stamping process. When the second pull rod 5 is pulled out, the non-forming end of the die punch 12 is opposite to the relief structure of the second pull rod 5, and the die punch 12 is not subjected to the pressure of the second pull rod 5. At this time, even if the mold is pressed down, the die punch 12 does not participate in the stamping process.

[0070] like Figure 9 , Figure 10 and Figure 11 As shown, the third tie rod 9 is located between the lower pad 8 and the lower die holder 10. The front end of the third tie rod 9 is provided with a relief structure. When the third tie rod 9 is pushed in, the non-forming end of the punch 14 of the forming punch abuts against the third tie rod 9, and the punch 14 pushes upward, participating in the stamping process. When the third tie rod 9 is pulled out, the non-forming end of the punch 14 is opposite to the relief structure of the third tie rod 9. Under the action of gravity, the punch 14 falls back to the relief structure of the third tie rod 9. At this time, the top of the punch 14 is lower than the upper surface of the lower die plate 7. Even if the die is pressed down, the punch 14 does not participate in the stamping process.

[0071] like Figure 9 As shown, each tie rod has a clearance structure along the first direction; that is, the first tie rod 2, the second tie rod 5, and the third tie rod 9 all have clearance structures in the vertical direction. When the first tie rod 2, the second tie rod 5, and the third tie rod 9 are pushed in, the punching punch 11, the die punch 12, and the convex punch 14 are all ejected by the tie rods and participate in the stamping process, thus realizing the stamping forming of the composite graphic element feature C. Figure 11 As shown, when each pull rod is pulled out to the position of the forming punch in the relief structure, the forming punch does not participate in the stamping. Alternatively, the relief structure can be omitted, and each pull rod can be pulled out to the position away from the forming punch. In this case, the rear end of each forming punch is also in an empty state, which can achieve the effect of the forming punch not participating in the stamping.

[0072] Therefore, by pushing in and pulling out the first tie rod 2, the second tie rod 5, and the third tie rod 9, the punching punch 11, the die punch 12 of the forming punch, and the punch 14 can be controlled to participate in or not participate in stamping. This allows for rapid switching of multiple forming punches, enabling the stamping forming of the composite graphic feature C without stopping the machine to change ordinary molds and composite stamping molds. A linkage structure can be set between the tie rods to achieve synchronous switching. Alternatively, the horizontal sliding of each tie rod can be set to be independent, and multiple stamping states can be achieved by controlling the pushing in and pulling out of the first tie rod 2, the second tie rod 5, and the third tie rod 9. By controlling the independent pushing in and pulling out of different tie rods, multiple state combinations can be formed, achieving switching between different feature forming modes, for example:

[0073] (1) If the first tie rod 2, the second tie rod 5 and the third tie rod 9 are all pushed in, the punching punch 11, the die punch 12 and the punch 14 of the forming punch will all participate in the stamping and forming, and the B type parts with composite graphic feature C can be stamped.

[0074] (2) If the first tie rod 2, the second tie rod 5 and the third tie rod 9 are all pulled out, the punching punch 11, the die punch 12 and the punch 14 of the forming punch will not participate in the stamping process, and the A type parts without composite graphic feature C can be stamped.

[0075] (3) If the first pull rod 2 is pushed in and the second pull rod 5 and the third pull rod 9 are pulled out, only the punching punch 11 participates in the stamping process, while the die punch 12 and punch 14 of the forming punch do not participate in the stamping process and can punch holes.

[0076] (4) If the second tie rod 5 and the third tie rod 9 are pushed in and the first tie rod 2 is pulled out, the punching punch 11 will not participate in the stamping process, and the die punch 12 and the punch 14 of the forming punch will both participate in the stamping process, and a convex shape can be formed.

[0077] Preferred, such as Figure 6 , Figure 7 and Figure 8 As shown, the edge of the yielding structure is provided with a guide structure, which is an inclined surface 18, an arc surface, or a sliding guide mechanism.

[0078] In this embodiment, as Figure 7 As shown, the guide structure is inclined plane 18.

[0079] In other embodiments, the sliding guide mechanism can be a rotatable sliding roller disposed at the edge of the relief structure, and the non-forming end of the forming punch is provided with a punch bevel 11-1 or an arc surface that matches the guide structure. By providing the guide structure, the pushing in and pulling out of the pull rod can be made smoother.

[0080] Preferably, the composite punch assembly further includes an elastic element that presses the forming punch against its corresponding pull rod. The elastic element and the forming punch are disposed on the same side of the pull rod, with one end of the elastic element pressing against the forming punch and the other end pressing against the mold.

[0081] like Figure 11 and Figure 12As shown, without the elastic element, the punch 14 falls back to the relief structure of the third tie rod 9 under the action of gravity and does not participate in the stamping process at all. However, the lower ends of the punching punch 11 and the die punch 12 will fall back onto the part 13 under the action of gravity. Although the rear ends of the punching punch 11 and the die punch 12 are in an empty state, neither of them is subjected to force and does not participate in the stamping process. When they come into contact with the part 13, only a small force is needed to push the forming punch back. Generally, it will not cause surface defects to the product. However, by setting the elastic element, each forming punch can be kept in contact with each tie rod. When the forming punch is located at the relief structure of each tie rod, the stamping end of the forming punch is far away from the part 13, avoiding causing surface defects to the part 13.

[0082] Preferred, such as Figure 6 As shown, the end of the pull rod is provided with a connecting part 17, which is used to connect to the drive mechanism that drives the pull rod to slide horizontally. By setting the connecting part 17 and connecting it to the drive mechanism, automatic and rapid switching of the forming punch can be achieved.

[0083] Preferred, such as Figure 9 As shown, the third pull rod 9 is provided with a material discharge through hole 9-1 at the corresponding position of the punch. By setting the material discharge through hole 9-1, the punched material can fall through the material discharge through hole 9-1, and there will be no situation of waste material blocking the third pull rod 9.

[0084] Preferred, such as Figure 5 As shown, the anti-interference structure is a U-shaped notch 5-1 provided at the front end of the tie rod, which extends along the sliding direction of the tie rod. In this embodiment, the tie rod in the middle layer is the second tie rod 5, and the front end of the second tie rod 5 is provided with a U-shaped notch 5-1. By providing the U-shaped notch 5-1, the second tie rod 5 slides horizontally without interfering with the punching head 11 controlled by the first tie rod 2. The forming punches controlled by the three tie rods are stacked, and the three tie rods do not interfere with each other. The punching head 11 of the upper die passes through the middle of the die punch 12, and the two also do not interfere with each other.

[0085] Preferably, the multi-layer tie rod composite punch quick-change structure also includes a locking structure for locking the horizontal sliding position of the tie rod, such as... Figure 13 As shown, the mold is equipped with a locking structure for locking the first pull rod 2. This locking structure is a locking pin 19, which is threadedly connected to the upper mold base 1 and is angled towards the first pull rod 2. Its end can fix the first pull rod 2. By setting the locking structure, the push-in or pull-out position of the pull rod can be fixed, preventing the position of the pull rod from changing due to accidental contact, which would affect the control of the pull rod on the forming punch.

[0086] This embodiment integrates a three-layer tie rod structure in the same space, which can independently control punching and pressing protrusions. This allows for the use of the same mold to quickly switch production between parts A and B without stopping the machine to change the mold, thus improving the switching efficiency of molds for this type of composite feature element C.

[0087] The composite feature element C provided in this embodiment is a composite feature of upward protrusion and punching. In other embodiments, it can also be a composite feature element composed of other features such as downward protrusion and punching, protrusion and bending.

[0088] This embodiment, by setting up a multi-layer tie rod assembly, a composite punch assembly, and an anti-interference structure on the tie rod in the middle layer, can control whether multiple forming punches of the stamping composite feature element C participate in stamping. This solves the technical problem that the existing quick-change die structure can only switch forming punches for a single feature element, resulting in low die switching efficiency when changing parts involving the presence or absence of composite feature element C.

[0089] Example 2

[0090] This utility model also provides a mold, including the multi-layer tie rod composite punch quick-change structure as described above. The mold is suitable for producing parts with composite feature element C, and the production of different styles of parts with or without composite feature element C can be quickly switched by pushing in and pulling out the tie rod.

[0091] In summary, this utility model integrates a multi-layer tie rod structure and multiple forming punches in the same space, enabling simultaneous and rapid switching of multiple forming punches. It allows for the replacement of parts with or without composite feature element C without the need for disassembling and replacing the punches after removing the mold, greatly shortening the production time for changing parts and improving the mold switching efficiency and production efficiency.

[0092] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A multi-layer pull rod composite punch quick-change structure, characterized in that, include: A multi-layer tie rod assembly includes at least three layers of tie rods, which are stacked along a first direction, and each tie rod is slidably disposed in a mold along a second direction. A composite punch assembly includes multiple forming punches, each forming punch having a punching direction along the first direction. The non-forming ends of the forming punches are respectively engaged with the corresponding pull rods. The sliding of the pull rods along the second direction allows the corresponding forming punches to participate in the punching or not participate in the punching. The forming punches include forming punches or punching punches. as well as The anti-interference structure is provided on the tie rod located in the middle layer, forming a cavity through which the forming punch controlled by other tie rods passes, so that the tie rod in the middle layer does not interfere with the forming punch controlled by other tie rods when sliding in the second direction.

2. The multi-layer drawbar composite punch quick-change structure according to claim 1, characterized in that, Each of the aforementioned tie rods is provided with a clearance structure along the first direction.

3. The multi-layer drawbar composite punch quick-change structure according to claim 2, characterized in that, The edge of the clearance structure is provided with a guide structure, which is an inclined surface or a sliding guide mechanism, and the non-forming end of the forming punch is provided with a punch inclined surface or arc surface that matches the guide structure.

4. The multi-layer drawbar composite punch quick-change structure according to claim 3, characterized in that, The composite punch assembly also includes an elastic element that presses the forming punch against the corresponding pull rod. The elastic element and the forming punch are located on the same side of the pull rod, with one end of the elastic element pressing against the forming punch and the other end pressing against the mold.

5. The multi-layer drawbar composite punch quick-change structure according to claim 1, characterized in that, Each of the pull rods has a connecting part at its end, which is used to connect to a drive mechanism that drives the pull rod to slide in a second direction.

6. The multi-layer drawbar composite punch quick-change structure according to claim 1, characterized in that, When the multi-layer tie rod assembly includes three layers of tie rods, the first tie rod in each tie rod is used to control whether the punching punch participates in the punching or not, the second tie rod is used to control whether the die punch of the forming punch participates in the punching or not, and the third tie rod is used to control whether the punch of the forming punch participates in the punching or not. The first tie rod, the second tie rod, and the punching punch are located above the upper ejector plate of the mold, the die punch is located inside the upper ejector plate, and the punch is located inside the lower template and the lower backing plate of the mold.

7. The multi-layer drawbar composite punch quick-change structure according to claim 6, characterized in that, The third tie rod has a material discharge through hole at the corresponding position of the punch.

8. The multi-layer drawbar composite punch quick-change structure according to claim 1, characterized in that, The anti-interference structure is a U-shaped notch provided at the front end of the pull rod, and the U-shaped notch extends along the sliding direction of the pull rod.

9. The multi-layer drawbar composite punch quick-change structure according to any one of claims 1-8, characterized in that, It also includes a locking structure for locking the sliding position of the pull rod.

10. A mold characterized in that, The multi-layer tie rod composite punch quick-change structure includes any one of claims 1-9.

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