Pressing plate structure capable of preventing broaching deformation

Abstract

The utility model discloses a pressure plate structure capable of preventing broaching deformation, which relates to the field of automobile thin material broaching, and comprises a pressure plate body and a limit piece, a punch is arranged on the pressure plate body, a pressure plate insert is arranged at the bottom of the pressure plate body, and the limit piece is arranged on the pressure plate body. A stamping hole longitudinally penetrating through the pressure plate insert is formed in the middle of the pressure plate insert and corresponds to the punch in position; the limiting piece comprises a punch insert bush which is arranged in the punching hole and longitudinally penetrates through the punching hole, the punch insert bush comprises a punch limiting hole used for limiting the punching path of the punch and a punch guide hole located in the bottom of the punch limiting hole, and the diameter of the punch guide hole is smaller than that of the punch limiting hole. The punch limiting hole and the punch guide hole in the punch bushing can limit the punching path of the punch in a segmented mode, it is guaranteed that the punch passing hole gap is even, the hole forming quality of part holes is improved, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of automobile thin material hole drawing, in particular to a material holding plate structure for preventing the hole drawing from being deformed. Background Art

[0002] When forming holes in automotive sheet metal, the sheet metal must first be placed on a machine tool or a lower die, and then the punch is pressed down using a pressing device to punch out the desired part holes on the sheet metal. To ensure the quality of the part holes, during the stamping process, the gap between the punch and the punch hole of the pressure plate must be strictly controlled to ensure that the gap between the punch and the punch hole of the pressure plate is uniform.

[0003] However, in actual use, after adjusting the punch position as the part hole position is adjusted, it is difficult to match the punch hole clearance of the pressure plate, causing the punch hole clearance to shift, resulting in the part hole deformation after the punch exits the pressure plate, failing to meet product quality requirements, causing waste, increasing processing costs, and also causing certain safety hazards when the parts are deformed due to hole pulling and flow to the customer end. Utility Model Content

[0004] The present application provides a material holding plate structure for preventing hole pulling from being deformed, which can solve the technical problems existing in the prior art.

[0005] The embodiment of the present application provides a press plate structure for preventing the deformation of a hole, comprising:

[0006] A blank pressing plate body, wherein a punch is arranged on the blank pressing plate body, a blank pressing plate block is arranged at the bottom of the blank pressing plate body, a punching hole is arranged in the middle of the blank pressing plate block and passes through the blank pressing plate block longitudinally, and the punching hole corresponds to the position of the punch;

[0007] A limiting member, wherein the limiting member comprises a punch sleeve which is arranged in the punching hole and passes through longitudinally, and the punch sleeve comprises a punch limiting hole for limiting the punching path of the punch and a punch guide hole which is located at the bottom of the punch limiting hole and has a diameter smaller than that of the punch limiting hole.

[0008] In one embodiment, the pressing plate body is provided with a through hole for the punch to pass through when moving longitudinally.

[0009] In one embodiment, the punch includes at least a first punching section passing through the punch limiting hole and a second punching section located at the bottom of the first punching section and having a smaller diameter than the first punching section, and the second punching section passes through the punch guide hole.

[0010] In one embodiment, the inner wall of the punch limiting hole is spaced a certain distance from the outer wall of the first punching section.

[0011] In one embodiment, the inner wall of the punch guide hole is spaced a certain distance from the outer wall of the second punching section.

[0012] In one embodiment, connectors for connecting the pressing plate entry block and the pressing plate body are provided on both sides of the pressing plate entry block.

[0013] In one embodiment, a fixing groove having the same center as the punch limiting hole and a diameter larger than that of the punch limiting hole is provided on the top of the pressing plate entry block body.

[0014] In one embodiment, a widened edge is provided on the outer periphery of the top of the punch limiting hole for fixing the punch sleeve in the punching hole.

[0015] In one embodiment, the widened edge is arranged in the fixing groove.

[0016] In one embodiment, the outer wall of the punch sleeve is spaced a certain distance from the inner wall of the punch hole.

[0017] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0018] By setting a pressing plate block at the bottom of the pressing plate body and a punch sleeve in the pressing plate block, when the punch descends and passes through the punch sleeve, the punch limiting hole and the punch guide hole in the punch sleeve can limit the descending path of the punch during punching in sections, preventing the position deviation when the punch passes through the hole, thereby solving the technical problem of hole deformation caused by the inability to accurately control the hole clearance of the punch in the related technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic structural diagram of a press plate structure for preventing hole deformation provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a punch sleeve structure in a blank holder structure for preventing hole deformation provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of a punch structure in a pressure plate structure for preventing hole deformation provided in an embodiment of the present application.

[0023] In the figure: 1. the pressing plate body; 101. the through hole; 2. the punch; 201. the first punching section; 202. the second punching section; 3. the pressing plate block; 301. the punching hole; 302. the fixing groove; 4. the punch sleeve; 401. the punch limiting hole; 402. the punch guide hole; 403. the widened edge; 5. the connecting piece. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] The embodiment of the present application provides a pressure plate structure for preventing hole deformation, which can solve the technical problem in the prior art that after adjusting the position of the part hole, the position of the punch 2 cannot be accurately controlled, resulting in the gap between the pressure plate punch 2 and the hole being offset, thereby causing the part hole to be deformed.

[0026] Figure 1 It is a structural schematic diagram of a pressure plate structure for preventing hole deformation provided in an embodiment of the present application. The pressure plate structure in the present application includes a pressure plate body 1 and a limiting member. A punch 2 is provided on the pressure plate body 1, and a pressure plate entry block 3 is provided at the bottom of the pressure plate body 1. A punching hole 301 is provided in the middle of the pressure plate entry block 3 and runs through the pressure plate entry block 3 longitudinally, and the punching hole 301 corresponds to the position of the punch 2; the limiting member, the limiting member includes a punch sleeve 4 which is arranged in the punching hole 301 and runs through longitudinally, the punch sleeve 4 includes a punch limiting hole 401 for limiting the punching path of the punch 2 and a punch guide hole 402 located at the bottom of the punch limiting hole 401 and having a diameter smaller than the punch limiting hole 401.

[0027] The pressing plate body 1 is mainly used to support the pressure and force that the stamping plate is subjected to during the stamping process so that it can maintain a stable shape. It can reduce the deformation and damage of the plate and ensure the accuracy and quality of stamping. The punch 2 arranged on the pressing plate body 1 can be replaced with different specifications according to the size requirements of the part hole to be stamped, and a pressing device is arranged at the end of the punch 2 away from the pressing plate body 1 to push the pressing plate body 1 and the punch 2 down together until the pressing plate body 1 presses the plate, and the punch 2 continues to descend to form a hole. This stamping method and configuration are commonly used combinations in this technical field and will not be elaborated on here.

[0028] The pressing plate entry block 3 is arranged at the bottom of the pressing plate and replaces the pressing plate body 1 to press the material plate during the stamping process. The punch 2 will first pass through the punching hole 301 on the pressing plate entry block 3 during the descent process. The punch sleeve 4 arranged in the punching hole 301 will limit the descent path of the punch 2 to prevent the position of the punch 2 from shifting. The punch sleeve 4 is made of steel material with high hardness, high wear resistance, uniform eutectic carbide, good toughness and not easy to crack. After the punch 2 passes through the punch sleeve 4, it reaches the material plate for stamping.

[0029] Furthermore, a through hole 101 is provided on the pressure plate body 1 for the punch 2 to pass through when it moves longitudinally. The diameter of the through hole 101 is larger than the diameter of the punch 2. The through hole 101 is mainly used for the punch 2 to pass through and does not produce a limiting effect. Therefore, there is no specific restriction on the diameter of the through hole 101, and the punch 2 can pass through it freely. However, the path of the punch 2 is vertically downward, passing through the through hole 101 and the punching hole 301 successively. Therefore, in order to ensure the normal descent of the punch 2, the through hole 101 needs to be cocentric with the punching hole 301.

[0030] Furthermore, the punch 2 at least includes a first punching section 201 passing through the punch limiting hole 401 and a second punching section 202 located at the bottom of the first punching section 201 and having a smaller diameter than the first punching section 201 , and the second punching section 202 passes through the punch guide hole 402 .

[0031] See Figure 2 , Figure 3 In order to further limit the punch 2, the internal space of the punch sleeve 4 is consistent with the shape of the punch 2, and the punch sleeve 4 is connected from top to bottom. When the hole pulling work is performed, the punch 2 slowly passes through the punch sleeve 4. The commonly used punch 2 is a multi-T-type punch. The punch 2 includes at least two sections, that is, at least a first punching section 201 and a second punching section 202. The diameter of the punch 2 is reduced from top to bottom in sections. When punching a part hole with a smaller diameter, the longitudinal length of the punch 2 remains unchanged, but its diameter needs to be reduced accordingly. The slender punch 2 is very easy to break during punching. Therefore, the segmented punch 2 can improve the stability of the punch 2, and the specific number of sections of the punch 2 is determined according to the size of the part hole.

[0032] In order to further limit the punch 2, the internal shape of the punch sleeve 4 is adapted to the shape of the punch 2. Specifically, taking the two-stage punch 2 as an example, the punch sleeve 4 includes a punch limiting hole 401 and a punch guide hole 402 located at the bottom of the punch limiting hole 401. When the punch 2 reaches the material plate, the first punching section 201 is located in the punch limiting hole 401, and the second limiting hole is located in the punch guide hole 402 and passes through the punch guide hole 402 to reach the material plate. It should be noted that the punch sleeve 4 in the present application can be applicable to the existing commonly used A-type punches and T-type punches or other types of punches. At this time, the internal shape of the punch sleeve 4 always remains consistent with the shape of the punch 2. When the punch 2 is changed according to the shape of the part hole, the internal shape of the punch sleeve 4 also changes accordingly.

[0033] Furthermore, the punch 2 will return to the pressure plate into the block 3 after the hole pulling is completed. Therefore, the inner wall of the punch limit hole 401 is spaced a certain distance from the outer wall of the first punching section 201, and the inner wall of the punch guide hole 402 is also required to be spaced a certain distance from the outer wall of the second punching section 202. Specifically, the distance between the punch limit hole 401 and the first punching section 201 can be maintained at 0.05MM-1MM. Similarly, the distance between the punch guide hole 402 and the second punching section 202 is maintained at 0.05MM-1MM. In order to further accurately position the punch 2 and keep the through-hole gap at the optimal distance, in the actual hole pulling process, the distance between the punch limit hole 401 and the first punching section 201 is set to 0.05MM, and the distance between the punch guide hole 402 and the second punching section 202 is set to 0.1MM, so as to effectively limit the punch 2. Under the premise of avoiding the deviation of the punch 2, it can also be used as a space for the punch 2 to flexibly enter and exit, thereby preventing friction between the punch 2 and the punch sleeve 4 and increasing wear.

[0034] Furthermore, both sides of the pressing plate inlet block 3 are provided with connecting pieces 5 for connecting the pressing plate inlet block 3 and the pressing plate body 1, see Figure 1 In one embodiment of the present application, the connecting member 5 is a locking screw, which penetrates the pressure plate block 3 longitudinally, and the two locking screws are symmetrically arranged. The screw head of the locking screw is located at the bottom of the pressure plate block 3 for easy installation. The screw rod of the locking screw passes through the pressure plate block 3 and is connected to the bottom of the pressure plate body 1. In this embodiment, screw holes are opened at the bottom of the pressure plate body 1 and at the corresponding positions where the locking screw rod passes.

[0035] Furthermore, a fixing groove 302 is provided on the top of the body of the pressing plate entry block 3, which is cocentric with the punch limiting hole 401 and has a diameter larger than the punch limiting hole 401. A widened edge 403 for fixing the punch insert 4 in the punching hole 301 is provided on the outer periphery of the top of the punch limiting hole 401. The widened edge 403 is arranged in the fixing groove 302. As an optional embodiment, the height of the fixing groove 302 and the edge of the widened edge 403 are equal and the height is set between 3-4MM, see Figure 2 The punch sleeve 4 is directly and vertically arranged in the punching hole 301. However, during punching, when the punch 2 deviates, it may accidentally touch the inner wall of the punch sleeve 4, causing the punch sleeve 4 to fall off. Therefore, in order to stabilize the connection between the punch sleeve 4 and the pressure plate block 3, in the present application, a widened edge 403 is arranged on the top of the punch sleeve 4. The widened edge 403 is located at the top of the punch limiting hole 401 and is arranged along the outer periphery of the punch limiting hole 401. The fixed groove 302 on the pressure plate block 3 is recessed downward and cocentric with the widened edge 403, so that the widened edge 403 can be directly placed in the fixed groove 302 to prevent the punch sleeve 4 from falling off, that is, the punch sleeve 4 as a whole is directly suspended on the pressure plate block 3 through the widened edge 403.

[0036] Furthermore, the outer wall of the punch sleeve 4 is spaced a certain distance from the inner wall of the punch hole 301, and the spacing distance is 0.5MM. The gap between the punch and the pressure plate in the normal design can be transferred to between the pressure plate and the sleeve, and there is also a certain distance between the inner wall of the fixed groove 302 and the widened edge 403, so that the punch sleeve 4 can be flexibly taken out, and it is convenient to replace the punch sleeve 4 of appropriate size according to the diameter of the punch 2, so as to limit the punch 2 more accurately.

[0037] The pressure plate structure in the present application is suitable for stamping processing with a stamping stroke within 16MM. Take A punch B19 as an example (A-type punch with a straight blade of 19mm). When using the pressure plate structure in the present application, the height of the pressure plate block 3 is set to 40MM, and a punch sleeve 4 matching the punch 2 model is selected, and the punch sleeve 4 is placed in the stamping hole 301 to ensure that the distance between the punch limit hole 401 and the first punching section 201 is set to 0.05MM, and the distance between the punch guide hole 402 and the second punching section 202 is set to 0.1MM. Then, the punch is pressed. The material plate entry block 3 is connected to the pressure plate through the connecting piece 5, and finally the material plate is placed in the lower die of the punch press, the punch press is started, and the pressure plate body 1 descends, driving the pressure plate entry block 3 to press the material plate. At this time, the second punching section 202 in the punch 2 is located in the punch limit hole 401, completing the initial positioning, and then the second punching section 202 continues to descend and passes through the punch guide hole 402 to complete the hole pulling work, and finally returns to the punch guide hole 402 again. During stamping, the punch guide hole 402 guides the second punching section 202 to ensure that the stamping stroke of the punch 2 is always in the correct position.

[0038] In the present application, the pressing plate has a simple structure and is highly replaceable, and can be adapted to the punching requirements of various diameters of part holes. The multi-stage punch 2 can be limited in sections through the punch limiting hole 401 and the punch guide hole 402 in the punch sleeve 4, and the clearance of the punch 2 through the hole is always kept uniform and of appropriate size, thereby ensuring the regularity of the part hole and improving product quality.

[0039] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0040] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0041] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A blank holding plate structure for preventing hole deformation, characterized in that: include: A material pressing plate body (1), wherein a punch (2) is provided on the material pressing plate body (1), a material pressing plate entry block (3) is provided at the bottom of the material pressing plate body (1), a punching hole (301) is provided in the middle of the material pressing plate entry block (3) and runs longitudinally through the material pressing plate entry block (3), and the punching hole (301) corresponds to the position of the punch (2); A limiting member, the limiting member comprising a punch sleeve (4) disposed in the punching hole (301) and longitudinally extending therethrough, the punch sleeve (4) comprising a punch limiting hole (401) for limiting the punching path of the punch (2) and a punch guide hole (402) located at the bottom of the punch limiting hole (401) and having a diameter smaller than that of the punch limiting hole (401).

2. A blank holding plate structure for preventing hole deformation according to claim 1, characterized in that: The pressing plate body (1) is provided with a through hole (101) for the punch (2) to pass through when moving longitudinally.

3. A blank holding plate structure for preventing hole deformation according to claim 1, characterized in that: The punch (2) comprises at least a first punching section (201) passing through the punch limiting hole (401) and a second punching section (202) located at the bottom of the first punching section (201) and having a smaller diameter than the first punching section (201), and the second punching section (202) passes through the punch guide hole (402).

4. A blank holding plate structure for preventing hole deformation according to claim 3, characterized in that: The inner wall of the punch limiting hole (401) is spaced a certain distance from the outer wall of the first punching section (201).

5. A blank holding plate structure for preventing hole deformation according to claim 3, characterized in that: The inner wall of the punch guide hole (402) is spaced a certain distance from the outer wall of the second punching section (202).

6. A blank holding plate structure for preventing hole deformation according to claim 1, characterized in that: Connecting pieces (5) for connecting the pressing plate entry block (3) and the pressing plate body (1) are provided on both sides of the pressing plate entry block (3).

7. A blank holding plate structure for preventing hole deformation according to claim 4, characterized in that: A fixing groove (302) having the same center as the punch limiting hole (401) and a diameter greater than that of the punch limiting hole (401) is provided on the top of the body of the pressing plate entry block (3).

8. A blank holding plate structure for preventing hole deformation according to claim 7, characterized in that: A widened edge (403) is provided on the outer periphery of the top of the punch limiting hole (401) for fixing the punch sleeve (4) in the punching hole (301).

9. A blank holding plate structure for preventing hole deformation according to claim 8, characterized in that: The widened edge (403) is arranged in the fixing groove (302).

10. A blank holding plate structure for preventing hole deformation according to claim 1, characterized in that: The outer wall of the punch sleeve (4) is spaced a certain distance from the inner wall of the punch hole (301).

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