Part piercing method and piercing die

Abstract

The application relates to a part punching method and a punching die, which comprises the following steps: designing a punching die according to the size of a part to be punched, placing a blank, compacting the blank, punching the blank by a punching punch, ejecting the part, and taking out the part. The technical scheme has the advantages that the compressive stress is established on the blank before punching, so that the tensile stress formed by the punching shear surface due to the blanking is totally or partially offset, the part and the part hole are prevented from being deformed due to the residual tensile stress of the hole shear surface, the size precision of the part after punching is high, the use requirement is met, and the processing efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of part punching, in particular to a part punching method and a punching die. BACKGROUND

[0002] Punching is a punching process separation procedure that a pair of tools (die) working parts punch and concave die, using a punching equipment to press the punched material between them, so that the shear deformation occurs at the blade gap, and then the punching is separated and broken.

[0003] In the use process of the traditional punching die, tensile stress is formed on the punching shear surface and the hole edge during the punching separation process, and there is still a large residual compressive stress after the punching is completed, which causes a large deformation of the punching hole and the surrounding area after the punching is completed, reduces the size precision of the punched part, and does not meet the use requirement. SUMMARY

[0004] Therefore, it is necessary to provide a part punching method and a punching die, which can form tensile stress on the punching shear surface and the hole edge during the punching separation process, and there is still a large residual compressive stress after the punching is completed, which causes a large deformation of the punching hole and the surrounding area after the punching is completed, reduces the size precision of the punched part, and does not meet the use requirement.

[0005] To achieve the above purpose, in the first aspect, the present application provides a part punching method, comprising the following steps:

[0006] Designing a punching die according to the size of the part to be punched

[0007] The punching die comprises a punching punch, a punching pressure plate and a concave die, the punching punch is arranged in the punching pressure plate and can slide relatively along the inner hole of the punching pressure plate, and the inner hole of the concave die is hollow;

[0008] Inserting a blank

[0009] The blank is placed on the concave die;

[0010] Pressing the blank

[0011] A first protrusion is arranged below the punching pressure plate, a second protrusion is arranged above the concave die, the punching punch and the punching pressure plate are moved downward along the first direction, the first protrusion and the second protrusion are pressed into the blank, and a recess is formed on the blank, so that the punching area of the blank is in a compressive stress state;

[0012] The punching punch acts on the blank

[0013] A third protrusion is arranged below the punching punch, the punching punch is continuously moved downward along the first direction, the third protrusion is pressed into the blank to form a recess, so as to further increase the compressive stress of the punching area of the blank;

[0014] punching the blank

[0015] continuing to move the piercing punch downward along the first direction to punch the blank until the part is separated from the waste, since the whole blank, especially the punching area, is in a compressive stress state, the tensile stress formed during the punching of the part is offset, and the whole punching hole shear surface and the adjacent area are in a low residual stress state;

[0016] part ejection

[0017] moving the piercing punch and the piercing pressure plate upward along the first direction to the starting position, the piercing punch is stationary, and the piercing pressure plate is moved downward along the first direction to eject the part from the piercing punch, and the waste naturally falls along the inner hole of the concave die;

[0018] part removal

[0019] removing the part from the piercing die to complete the whole piercing process.

[0020] Unlike the prior art, the above technical solution places the blank on the concave die, moves the piercing punch and the piercing pressure plate downward along the first direction to press the first protrusion and the second protrusion into the blank to form a recess, so that the punching area of the blank is in a compressive stress state; continues to move the piercing punch downward along the first direction to punch the blank until the part is separated from the waste, since the whole blank, especially the punching area, is in a compressive stress state, the tensile stress formed in the hole and the adjacent area during the punching of the part is offset, and the whole punching hole shear surface and the adjacent area are in a low residual stress state after the punching is completed; then moves the piercing punch and the piercing pressure plate upward along the first direction to the starting position, the piercing punch is stationary, and the piercing pressure plate is moved downward along the first direction to eject the part from the piercing punch, and the waste naturally falls along the inner hole of the concave die; thus, since a compressive stress is established on the blank before piercing, the tensile stress formed on the piercing shear surface by the piercing is offset in whole or in part, the deformation of the part and the hole of the part caused by the residual tensile stress of the hole shear surface is avoided, the dimensional accuracy of the part after piercing is ensured to be high, the use requirements are met, and the processing efficiency is high.

[0021] As an embodiment of the present application, the positions of the first protrusion and the second protrusion correspond to each other.

[0022] Thus, the positions of the first protrusion and the second protrusion correspond to each other, i.e., the first protrusion and the second protrusion are located on the same vertical line, which on the one hand can cooperate with each other to press into the blank to form a recess when the piercing punch and the piercing pressure plate are moved downward along the first direction, so that the piercing die tightly presses the blank, so that the whole blank, especially the punching area, is in a compressive stress state; on the other hand, the corresponding recess ensures the accuracy of subsequent piercing, thereby improving the dimensional accuracy of the part after piercing.

[0023] As an embodiment of the present application, the cross section of the first protrusion is inverted trapezoid, and the cross section of the second protrusion is normal trapezoid.

[0024] In this way, by setting the cross section of the first protrusion as inverted trapezoid and the cross section of the second protrusion as normal trapezoid, the diameter of the protrusion pressed into the blank gradually increases, thereby facilitating the protrusion to be pressed into the blank to form a recess, and in addition, the gradual pressing of the protrusion into the blank can also avoid excessive deformation of the blank.

[0025] As an embodiment of the present application, the cross sections of the first protrusion, the second protrusion and the third protrusion are rectangular.

[0026] In this way, since the positions of the protrusions are not large, the cross sections of the protrusions are set as rectangular for the convenience of mold manufacturing.

[0027] As an embodiment of the present application, the preset height and the preset width of the first protrusion, the second protrusion and the third protrusion are consistent.

[0028] In this way, by setting the preset height and the preset width of the first protrusion, the second protrusion and the third protrusion to be consistent, the stress concentration in the punching process is ensured, and the punching efficiency is improved.

[0029] As an embodiment of the present application, the preset height is 0.05-0.2mm, and the preset width is 0.2-0.5mm.

[0030] In this way, by setting the height and the width of the protrusion in the specified range, the punching die is used for the specified part range, so as to ensure that the protrusion can be pressed into the blank with small force, and the requirement for equipment tonnage is reduced.

[0031] As an embodiment of the present application, the cross section of the third protrusion is inverted trapezoid.

[0032] In this way, by setting the cross section of the third protrusion as inverted trapezoid, the diameter of the third protrusion pressed into the blank gradually increases, thereby facilitating the third protrusion to be pressed into the blank to form a recess, and in addition, the gradual pressing of the third protrusion into the blank can also avoid excessive deformation of the blank.

[0033] As an embodiment of the present application, the diameter of the punching convex die is the same as the diameter of the inner hole of the concave die.

[0034] In this way, by setting the diameter of the punching convex die to be the same as the diameter of the inner hole of the concave die, the hole punched out is circular. In other embodiments, the diameter of the punching convex die can be set to be smaller than the diameter of the inner hole of the concave die, and the shape and the diameter of the punching convex die are determined according to the actual situation, so that the hole punched out can be a special-shaped hole.

[0035] As an embodiment of the present application, the thickness of the blank is 0.5-15mm.

[0036] Thus, by setting the thickness of the blank to 0.5-15 mm, the piercing die is used for a specified part range to ensure the stability and accuracy of the blanking.

[0037] To achieve the above object, in a second aspect, the inventor provides a part piercing die for performing any one of the part piercing methods provided by the inventor.

[0038] Unlike the prior art, the above technical solution is provided with a piercing die, which completes the piercing under the action of the piercing die. Since the compressive stress is established on the blank before piercing, the tensile stress formed by the piercing shear surface is completely or partially offset, avoiding the deformation of the part and the hole of the part caused by the residual tensile stress of the hole shear surface, ensuring the high dimensional accuracy of the part after piercing, meeting the use requirements, and having high processing efficiency.

[0039] The above description related to the invention is only a summary of the technical solution of the present application. In order for those skilled in the art to more clearly understand the technical solution of the present application, and then can be implemented according to the content of the description and the drawings, and in order to make the above and other purposes, characteristics and advantages of the present application can be more easily understood, the following is described in conjunction with the specific embodiments of the present application and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0040] The accompanying drawings are only used to show the principles, implementation manners, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and cannot be considered as a limitation of the present application.

[0041] In the drawings of the specification:

[0042] Figure 1 Flowchart of the part piercing method of an embodiment of the present application;

[0043] Figure 2 Schematic diagram of the blank insertion of an embodiment of the present application;

[0044] Figure 3 Schematic diagram of the blank pressing of an embodiment of the present application;

[0045] Figure 4 Schematic diagram of the blank pressing of an embodiment of the present application; Figure 3 Enlarged view of A in FIG. 6;

[0046] Figure 5 Schematic diagram of the blank pressing of an embodiment of the present application;

[0047] Figure 6 Schematic diagram of the blank pressing of an embodiment of the present application; Figure 5 Enlarged view of B in FIG. 6;

[0048] Figure 7A schematic view of blank punching for one embodiment of the present application;

[0049] Figure 8 A schematic view of the punch and the punch plate returning to the starting position for one embodiment of the present application;

[0050] Figure 9 For Figure 8 An enlarged view of the middle C;

[0051] Figure 10 A schematic view of the part after removal for one embodiment of the present application;

[0052] Figure 11 A schematic view of the part after removal of the waste for one embodiment of the present application.

[0053] The reference signs involved in the above-mentioned figures are explained as follows:

[0054] 1. Punch

[0055] 11. Third protrusion

[0056] 2. Punch plate

[0057] 21. First protrusion

[0058] 3. Die

[0059] 31. Second protrusion

[0060] 32. Inner hole

[0061] 4. Blank

[0062] 5. Part

[0063] 6. Waste

[0064] a. First direction

[0065] h. Preset height

[0066] w. Preset width DETAILED DESCRIPTION

[0067] In order to describe possible application scenarios, technical principles, specific schemes that can be implemented, purposes and effects that can be achieved of the present application in detail, the following will be described in detail in combination with specific embodiments listed and with the aid of the accompanying drawings. The embodiments described in the present document are only used to more clearly illustrate the technical schemes of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0068] The term "embodiment" is mentioned herein means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit the independence or association between other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, each technical feature mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0069] Unless otherwise defined, the meaning of technical terms used herein is the same as commonly understood by one of ordinary skill in the art to which this application belongs; the use of related terms in the present application is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0070] In the description of the present application, the phrase "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally represents that the associated objects before and after are a "or" logical relationship.

[0071] In the present application, the 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 actual quantity, primary and secondary or order relationship between the entities or operations.

[0072] In the present application, without more limitation, the "include", "contain", "have" or other similar expressions used in the sentence are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include the elements inherent in such process, method or product.

[0073] In the present application, the expressions such as "greater than", "less than", "exceed" are understood as not including the number; the expressions such as "above", "below", "within" are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly limited.

[0074] In the description of the embodiments of the present application, the spatially relative terms, such as "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or position relationship shown in the specific embodiment or the accompanying drawings, and are only for the convenience of describing the specific embodiments of the present application or for the convenience of the reader to understand, and do not indicate or imply that the indicated device or component must have a particular position, a particular orientation, or be constructed or operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0075] Unless otherwise expressly specified or limited, the terms "mount", "connect", "connection", "fixed", "set", and the like used in the description of the embodiments of the present application should be interpreted broadly. For example, the "connection" can be a fixed connection, or a detachable connection, or an integral setting; it can be a mechanical connection, or an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium; it can be a communication or interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0076] In the use process of the traditional punching die, the punching punch will generate a large impact force when punching the blank, and the blank is easy to deviate or cause the blank to deform too much during the punching process and after the punching is completed, which leads to a decrease in the size precision of the punched part, and does not meet the use requirements. The inventor found the above problems, in order to avoid the blank from deviating or deforming too much during the punching process and after the punching is completed, a compressive stress is established on the blank before punching, so as to completely or partially offset the tensile stress formed on the punching shear surface due to punching, avoid the deformation of the part and the part hole caused by the residual tensile stress of the hole shear surface, effectively maintain the size precision of the punched part, the product size precision is high, and the processing efficiency is high.

[0077] The part 5 punching method and punching die of the present application are mainly used for the blank 4 with a thickness of 0.5-15mm, and separate the part 5 from the waste 6 by punching the blank 4.

[0078] According to some embodiments of the present application, please refer to Figures 1 to 11 The present embodiment relates to a part 5 punching method, comprising the following steps:

[0079] S101: Design a punching die according to the size of the part 5 to be punched

[0080] As Figure 2As shown, the punching die includes a punching punch 1, a punching pressure plate 2, and a die 3. The punching punch 1 is disposed inside the punching pressure plate 2 and can slide relative to the inner hole of the punching pressure plate 2. The inner hole 32 of the die 3 is hollow.

[0081] S102: Insert blank 4

[0082] like Figure 2 As shown, the blank 4 is placed on the die 3;

[0083] S103: Press the billet 4.

[0084] like Figure 3 and Figure 4 As shown, a first protrusion 21 is provided below the punching plate 2, and a second protrusion 31 is provided above the die 3. The punching punch 1 and the punching plate 2 are moved downward along the first direction a, so that the first protrusion 21 and the second protrusion 31 are pressed into the blank 4 and a depression is formed on the blank 4, so that the punching area of ​​the blank 4 is in a state of compressive stress.

[0085] S104: Punching punch 1 functions on blank 4

[0086] like Figure 5 and Figure 6 As shown, a third protrusion 11 is provided below the punching punch 1. The punching punch 1 is moved downward along the first direction a, so that the third protrusion 11 is pressed into the blank 4 to form a depression, so as to further increase the compressive stress in the punching area of ​​the blank 4.

[0087] S105: Punching the blank 4

[0088] like Figure 7 As shown, the punching punch 1 continues to move downward along the first direction a to punch the blank 4 until the part 5 is separated from the scrap 6. Since the blank 4 as a whole, especially the punching area, is in a compressive stress state, it can offset the tensile stress formed during the punching process of the part 5. The entire punching hole shear surface and adjacent area are in a low residual stress state.

[0089] S106: Part 5 ejected

[0090] like Figure 8 and Figure 10 As shown, the punching punch 1 and the punching pressure plate 2 move upward along the first direction a to the starting position. The punching punch 1 is stationary, and the punching pressure plate 2 moves downward along the first direction a to push the part 5 out of the punching punch 1. The scrap 6 falls naturally along the inner hole 31 of the die 3.

[0091] S107: Part 5 removed

[0092] like Figure 11 As shown, part 5 is removed from the punching die to complete the entire punching process.

[0093] At S102, when the blank 4 is placed, the second protrusion 31 of the concave die 3 protrudes, so the blank 4 is placed on the second protrusion 31.

[0094] At S105, when the blank 4 is punched, the punching punch 1 continues to move downward along the first direction a to punch the blank 4, so the part 5 enters the inner hole 32 of the concave die 3 with the movement of the punching punch 1, thereby separating the part 5 and the waste 6.

[0095] At S106, when the part 5 and the waste 6 are ejected, the interference fit between the part 5 and the punching punch 1 and the punching pressure plate 2 causes the punched part 5 to move upward along the first direction a to the starting position with the punching punch 1 and the punching pressure plate 2. At this time, the punching punch 1 is only stationary, and the punching pressure plate 2 is moved downward along the first direction a, so that the part 5 is ejected from the punching punch 1. In addition, the punching pressure plate 2 can also be stationary, and the punching punch 1 can be moved upward along the first direction a, so that the part 5 can also be moved out.

[0096] The above technical solution places the blank 4 on the concave die 3, moves the punching punch 1 and the punching pressure plate 2 downward along the first direction a to press the first protrusion 21 and the second protrusion 31 into the blank 4 to form a recess, so that the entire blank 4 is in a compressive stress state; continues to move the punching punch 1 downward along the first direction a to punch the blank 4 until the part 5 and the waste 6 are separated, because the punching area of the blank 4 is in a compressive stress state, the tensile stress formed in the hole and the adjacent area during the punching process of the part 5 can be offset, and the entire punching shear surface and the adjacent area are in a low residual stress state after the punching is completed; then moves the punching punch 1 and the punching pressure plate 2 upward along the first direction a to the starting position, the punching punch 1 is stationary, and the punching pressure plate 2 is moved downward along the first direction a to eject the part 5 from the punching punch 1, and the waste 6 naturally falls along the inner hole 31 of the concave die 3; in this way, because the compressive stress is established on the blank 4 before punching, the tensile stress formed on the punching shear surface by the punching is offset in whole or in part, the deformation of the part 5 and the part hole caused by the residual tensile stress of the punching shear surface is avoided, the dimensional accuracy of the part 5 after punching is high, the use requirement is met, and the processing efficiency is high.

[0097] According to some embodiments of the present application, the first protrusion 21 and the second protrusion 31 can correspond in position. Figure 4

[0098] ​Thus, the first protrusion 21 and the second protrusion 31 are located in the same vertical line, on one hand, the first protrusion 21 and the second protrusion 31 can be matched to be pressed into the blank 4 to form a recess when the punching punch 1 and the punching anvil 2 move downward along the first direction a, so that the punching die can press the blank 4, and the whole blank 4 is in a state of compressive stress; on the other hand, the recess ensures the accuracy of subsequent blanking, thereby improving the dimensional accuracy of the punched part 5. Preferably, the first protrusion 21 of the punching anvil 2 is arranged close to the punching punch 1, and the second protrusion 31 of the concave die 3 is arranged close to the inner hole 32 of the concave die 3.

[0099] According to some embodiments of the present application, optionally, the cross section of the first protrusion 21 is inverted trapezoidal, and the cross section of the second protrusion 31 is trapezoidal.

[0100] Thus, by setting the cross section of the first protrusion 21 as inverted trapezoidal and the cross section of the second protrusion 31 as trapezoidal, the diameter of the protrusion pressed into the blank 4 gradually increases, thereby facilitating the protrusion to be pressed into the blank 4 to form a recess, and in addition, the gradual pressing of the protrusion into the blank 4 can also avoid excessive deformation of the blank 4.

[0101] According to some embodiments of the present application, optionally, as shown in Figure 6 , the cross section of the first protrusion 21, the second protrusion 31 and the third protrusion 11 is rectangular.

[0102] Thus, since the positions of the protrusions are not large, the cross sections of the protrusions are uniformly set as rectangular for the convenience of mold manufacturing.

[0103] According to some embodiments of the present application, optionally, as shown in Figure 6 and Figure 9 , the preset height h and the preset width w of the first protrusion 21, the second protrusion 31 and the third protrusion 11 are consistent.

[0104] Thus, by setting the preset height h and the preset width w of the first protrusion 21, the second protrusion 31 and the third protrusion 11 to be consistent, the stress concentration in the blanking process is ensured, and the blanking efficiency is improved.

[0105] According to some embodiments of the present application, optionally, as shown in Figure 9 , the preset height h is 0.05-0.2mm, and the preset width w is 0.2-0.5mm.

[0106] Thus, by setting the height and width of the protrusion within a specified range, the punching die is used for a specified part 5 range, so as to ensure that the protrusion can be pressed into the blank 4 with small force, and the requirement for equipment tonnage is reduced.

[0107] According to some embodiments of the present application, optionally, the cross section of the third protrusion 11 is inverted trapezoidal.

[0108] Thus, by setting the cross-sectional shape of the third protrusion 11 as an inverted trapezoid, the diameter of the third protrusion 11 pressed into the blank 4 gradually increases, thereby facilitating the third protrusion 11 to be pressed into the blank 4 to form a recess, and in addition, the gradual pressing of the third protrusion 11 into the blank 4 can also avoid excessive deformation of the blank 4. Preferably, the punching punch 1 is provided with third protrusions 11 on both sides close to the punching anvil 2.

[0109] According to some embodiments of the present application, optionally, as shown in Figures 2 to 11 the diameter of the punching punch 1 is the same as the diameter of the inner hole 32 of the die 3.

[0110] Thus, by setting the diameter of the punching punch 1 to be the same as the diameter of the inner hole 32 of the die 3, the punched hole is circular. In other embodiments, the diameter of the punching punch 1 can also be set to be smaller than the diameter of the inner hole 32 of the die 3, and the shape, diameter, and height and width of the protrusions of the punching punch 1 can be determined according to actual conditions, so that the punched hole can be a special-shaped hole.

[0111] According to some embodiments of the present application, optionally, the thickness of the blank 4 is 0.5-15mm.

[0112] Thus, by setting the thickness of the blank 4 to be 0.5-15mm, the punching die is used for specified parts 5, so as to ensure the stability and accuracy of the punching.

[0113] According to some embodiments of the present application, optionally, the punching die further comprises a counter block, which is arranged at the inner hole 32 of the die 3 and can slide relatively along the inner hole 32 of the die 3.

[0114] Thus, by setting the counter block, the subsequent waste 6 can be easily ejected, and the cleaning is facilitated. Specifically, after the punching anvil 2 moves downward along the first direction a to eject the part 5 from the punching punch 1, the counter block moves upward along the first direction a to eject the waste 6.

[0115] According to some embodiments of the present application, please refer to Figures 2 to 11 , the present embodiment also relates to a part 5 punching die for performing the part 5 punching method.

[0116] The above technical solution is provided with a punching die, and the punching is completed under the action of the punching die. Since the compressive stress is established on the blank 4 before punching, the tensile stress formed on the punching shear surface by punching is completely or partially offset, the deformation of the part 5 and the part hole caused by the residual tensile stress of the hole shear surface is avoided, the dimensional accuracy of the part 5 after punching is high, the use requirements are met, and the processing efficiency is high.

[0117] Those skilled in the art will understand that the above embodiments can be provided as methods, apparatus, or computer program products. These embodiments may take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. All or part of the steps in the methods involved in the above embodiments can be implemented by a program instructing related hardware, and the program can be stored in a computer-readable storage medium for executing all or part of the steps described in the methods of the above embodiments. The computer device includes, but is not limited to: personal computers, servers, general-purpose computers, special-purpose computers, network devices, embedded devices, programmable devices, smart mobile terminals, smart home devices, wearable smart devices, in-vehicle smart devices, etc.; the storage medium includes, but is not limited to: RAM, ROM, magnetic disks, magnetic tapes, optical disks, flash memory, USB flash drives, portable hard drives, memory cards, memory sticks, network server storage, network cloud storage, etc.

[0118] The above embodiments are described with reference to flowchart illustrations and / or block diagrams of the methods, apparatus (systems), and computer program products according to the embodiments. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a computer device to produce a machine, such that the instructions, which execute via the processor of the computer device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0119] These computer program instructions may also be stored in a computer device-readable storage medium that can direct a computer device to operate in a particular manner, such that the instructions stored in the computer device-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0120] These computer program instructions can also be loaded onto a computer device, causing a series of operational steps to be performed on the computer device to produce a computer-implemented process, thereby providing instructions that execute on the computer device for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0121] It should be noted that, although the above-mentioned embodiments have been described herein, the patent protection scope of the present application is not limited thereby. Therefore, based on the innovative idea of the present application, the changes and modifications made to the embodiments described herein, or the equivalent structures or equivalent process transformations made using the content of the present application specification and drawings, directly or indirectly apply the above technical solutions to other related technical fields, are all included in the patent protection scope of the present application.

Claims

1. A method of piercing a part, characterized by, The method comprises the following steps: Designing a punching die according to the size of the part to be punched The punching die comprises a punching punch, a punching platen and a die, the punching punch is arranged in the punching platen and can slide relatively along the inner hole of the punching platen, and the inner hole of the die is hollow; Placing a blank The blank is placed on the die; Pressing the blank A first protrusion is arranged below the punching platen, a second protrusion is arranged above the die, the punching punch and the punching platen are moved downward along a first direction, the first protrusion and the second protrusion are pressed into the blank, and a recess is formed on the blank, so that the punching area of the blank is in a compressive stress state; The punching punch acts on the blank A third protrusion is arranged below the punching punch, the punching punch is continuously moved downward along the first direction, the third protrusion is pressed into the blank to form a recess, so as to further increase the compressive stress of the punching area of the blank; Punching the blank The punching punch is continuously moved downward along the first direction to punch the blank until the part is separated from the waste, since the punching area is in a compressive stress state, the tensile stress formed during the punching process of the part can be offset, and the entire punching hole shear surface and the adjacent area are in a low residual stress state; The part is ejected The punching punch and the punching platen are moved upward along the first direction to the starting position, the punching punch is stationary, the punching platen is moved downward along the first direction, the part is ejected from the punching punch, and the waste naturally falls along the inner hole of the die; The part is taken out of the punching die, and the entire punching process is completed. The positions of the first protrusion and the second protrusion correspond to each other.

2. The method of punching a part according to claim 1, wherein, The cross section of the first protrusion is inverted trapezoidal, and the cross section of the second protrusion is trapezoidal.

3. The method of punching a part according to claim 2, wherein, The cross sections of the first protrusion, the second protrusion and the third protrusion are rectangular.

4. The method of punching a part according to claim 1, wherein, The preset height and the preset width of the first protrusion, the second protrusion and the third protrusion are consistent.

5. The method of punching a part according to claim 4, wherein, The preset height is 0.05-0.2 mm, and the preset width is 0.2-0.5 mm.

6. The method of punching a part according to claim 5, wherein, The cross section of the third protrusion is inverted trapezoidal.

7. The method of punching a part according to claim 1, wherein, The diameter of the punching punch is the same as the diameter of the inner hole of the die.

8. The method of punching a part according to claim 1, wherein, The thickness of the blank is 0.5-15 mm.

9. The method of punching a part according to claim 1, wherein, A device for performing the part punching method according to any one of claims 1-9.

10. A piercing die for a part, characterized in that, ​

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