A metal mold for protruding and extruding a protruding part and a method for forming a protruding part

Abstract

The application discloses a hardware die for forming a convex boss by using material extrusion, which comprises an upper die, a lower die, an extrusion punch and an extrusion die. The lower die can be close to or away from the upper die, and a stamping space for placing material is formed between the lower die and the upper die. The extrusion punch is arranged on the upper die, and a circular table surface and a flat surface connected with the circular table surface are arranged at the end of the extrusion punch. The extrusion die is arranged on the lower die, and the extrusion die corresponds to the end of the extrusion punch. A groove for inserting the extrusion punch is formed in the extrusion die. The application also discloses a forming method of the convex boss. By using the plasticity of the material, the hardware die changes the flowing direction of the material, increases the thickness of the material in the height direction, and realizes that the height of the convex boss is greater than the thickness of the material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mould, in particular to a hardware mould for forming a protruding boss by material extrusion and a method for forming a protruding boss. BACKGROUND

[0002] In a hardware stamping mould, extrusion of a protruding boss is a special stamping process, and a protruding boss structure is usually needed in electronic components to make the electronic components have multiple functions. The protruding boss structure of the electronic component is usually used for riveting, positioning, supporting, welding and the like. Since the electronic component is a precision component, the height of the protruding boss has strict requirements.

[0003] The traditional extrusion of the protruding boss usually adopts a cross-cut extrusion mode, and the height of the protruding boss must be less than the thickness of the material to prevent the protruding boss from cracking or falling off. When the protruding boss is extruded by the traditional cross-cut extrusion mode, if the height of the protruding boss is greater than the thickness of the material, the end and the sidewall of the protruding boss may crack or fall off, and the defective rate is high. The traditional cross-cut extrusion mode is difficult to realize for the protruding boss height requirement of some electronic components which must be greater than the thickness of the material. In view of this, the applicant has developed a hardware mould for forming a protruding boss by material extrusion, which changes the shape of the blind hole of the protruding boss to meet the height requirement of the protruding boss of special electronic components. SUMMARY

[0004] The present application aims to at least solve one of the above technical problems in the technical field. To this end, one object of the present application is to provide a hardware mould for forming a protruding boss by material extrusion, which changes the flow direction of the material by using the plasticity of the material to increase the thickness of the material in the height direction, so as to realize that the height of the protruding boss is greater than the thickness of the material.

[0005] A second object of the present application is to provide a method for forming a protruding boss, which changes the flow direction of the material by using the plasticity of the material to increase the thickness of the material in the height direction by means of the hardware mould, so as to realize that the height of the protruding boss is greater than the thickness of the material.

[0006] To achieve the above-mentioned objects, the present application provides a hardware mould for forming a protruding boss by material extrusion, which comprises an upper die, a lower die, an extrusion punch and an extrusion die.

[0007] The lower die can be close to or away from the upper die, and a stamping space for placing the material is formed between the lower die and the upper die.

[0008] The extrusion punch is arranged on the upper die, and a circular table surface and a flat surface connected with the circular table surface are arranged at the end of the extrusion punch.

[0009] The extrusion die is arranged on the lower die, and the extrusion die corresponds to the end of the extrusion punch, and a groove for inserting the extrusion punch is formed in the extrusion die.

[0010] According to the hardware die for extrusion forming convex boss of the embodiment of the present application, when the material needs to be extruded into a convex boss, the material is first placed in the stamping space. Since the end of the extrusion punch is provided with a circular table surface and a flat surface connected with the circular table surface, when the extrusion punch stamps, the flat surface first contacts the material, and then the circular table surface extrudes the side wall of the material, the plasticity of the material is utilized to increase the thickness direction material in the height direction, so that the height of the convex boss is greater than the thickness of the material. Therefore, the present application utilizes the plasticity of the material to change the flow direction of the material, so that the thickness direction material is extruded and increased in the height direction, and the height of the convex boss is greater than the thickness of the material.

[0011] In addition, the hardware die for extrusion forming convex boss according to the above embodiment of the present application can also have the following additional technical features.

[0012] Further, the circular table surface of the end of the extrusion punch comprises a first circular table surface and a second circular table surface, one side of the second circular table surface is connected with the first circular table surface, and the flat surface is connected with the other side of the second circular table surface, and the taper of the second circular table surface is smaller than the taper of the first circular table surface.

[0013] Further, the taper of the second circular table surface is 15-25 degrees, and the taper of the first circular table surface is 65-75 degrees.

[0014] Further, the height of the second circular table surface is greater than or equal to twice the height of the first circular table surface.

[0015] Further, the second circular table surface and the flat surface are connected through a round corner.

[0016] Further, the hardware die further comprises a reverse material-increasing concave die and a reverse material-increasing punch, the reverse material-increasing concave die is arranged on the upper die, and an arc-shaped groove is arranged in the reverse material-increasing concave die; the reverse material-increasing punch is arranged on the lower die, the end of the reverse material-increasing punch corresponds to the reverse material-increasing concave die, and the end of the reverse material-increasing punch is provided with an arc surface which can be inserted into the arc-shaped groove of the reverse material-increasing concave die to make the material form a micro-convex structure.

[0017] Further, the depth at which the reverse material-increasing punch is inserted into the reverse material-increasing concave die is smaller than the depth at which the extrusion punch is inserted into the extrusion concave die.

[0018] Further, the upper die comprises an upper die base, an upper cushion plate, a fixed plate, a stop plate and an upper stripper plate, one end of the extrusion punch is fixed on the upper cushion plate, and the first circular table surface, the second circular table surface and the flat surface of the other end of the extrusion punch protrude from the upper stripper plate; the lower die comprises a lower die base, a lower cushion plate and a lower die plate, an elastic material stripping piece, a force transmission top rod and a limiting material stripping rod are arranged in the lower die, the elastic material stripping piece is arranged in the lower die base, the force transmission top rod is arranged in the lower cushion plate, one end of the force transmission top rod is connected with the elastic material stripping piece, the limiting material stripping rod is arranged at the other end of the elastic material stripping piece, the extrusion concave die is arranged in the lower die plate, and the extrusion concave die is connected with the limiting material stripping rod.

[0019] Further, the reverse material adding die is arranged on the upper stripper plate and located at one side of the extruding punch, and the reverse material adding punch is fixed at one end in the lower die base and protrudes from the other end of the lower die plate.

[0020] To achieve the above object, the second aspect of the embodiment of the present application provides a forming method of the convex boss, comprising the following steps:

[0021] Step S1: placing the material in the stamping space in the die;

[0022] Step S2: inserting the reverse material adding punch into the reverse material adding die to add part of the material into the reverse material adding die to form the micro-convex structure;

[0023] Step S3: moving the material to the extruding punch;

[0024] Step S4: extruding the micro-convex structure into the extruding die by the extruding punch to form the convex boss;

[0025] Step S5: moving the material out of the die.

[0026] According to the forming method of the convex boss, when the material needs to be extruded into the convex boss, the material is placed in the stamping space in the die, the reverse material adding punch is inserted into the reverse material adding die to add part of the material into the reverse material adding die to form the micro-convex structure, the material is moved to the extruding punch, the micro-convex structure is extruded into the extruding die by the extruding punch to form the convex boss, and the material is moved out of the die. Since the end of the extruding punch can be provided with a circular truncated cone and a flat surface connected with the circular truncated cone, when the extruding punch is stamped, the circular truncated cone extrudes the side wall of the material, the plasticity of the material is utilized to increase the thickness direction material in the height direction, and the height of the convex boss is greater than the thickness of the material. Therefore, the plasticity of the material is utilized to change the flow direction of the material, the thickness material is extruded and increased in the height direction, and the height of the convex boss is greater than the thickness of the material.

[0027] Further, in step S4, the extruding punch is close to the lower die, the second circular truncated cone of the extruding punch first extrudes the material to form a small package, then the extruding punch continues to be close to the lower die, and the first circular truncated cone of the extruding punch extrudes the material to form the convex boss. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Fig. 5 is a structural schematic diagram of the hardware die for extruding and forming the convex boss according to the embodiment of the present application;

[0029] Figure 2 Fig. 6 is an exploded view of the hardware die for extruding and forming the convex boss according to the embodiment of the present application;

[0030] Figure 3 Fig. 7 is a partial enlarged view of Figure 2 Fig. 8 is a partial enlarged view of

[0031] Figure 4Structure diagram of a protruding boss formed by extruding a material by a protruding punch according to an embodiment of the present application;

[0032] Figure 5 Structure diagram of a protruding boss formed by extruding a material by a protruding punch according to an embodiment of the present application;

[0033] Figure 6 Structure diagram of a protruding boss formed by extruding a material by a protruding punch according to an embodiment of the present application; Figure 5 Structure diagram of a protruding boss formed by extruding a material by a protruding punch according to an embodiment of the present application;

[0034] Figure 7 Structure diagram of a protruding boss formed by extruding a material by a protruding punch according to an embodiment of the present application.

[0035] Label description

[0036] Upper die 1, upper die seat 11, upper pad plate 12, fixed plate 13, stop plate 14, upper stripper plate 15;

[0037] Lower die 2, lower die seat 21, lower pad plate 22, lower die plate 23, stripper elastic element 24, force transmission top rod 25, limit material stripping rod 26;

[0038] Extruding punch 3, circular platform 31, first circular platform 311, second circular platform 312, flat surface 32;

[0039] Extruding die 4, groove 41;

[0040] Reverse material adding die 5, arc-shaped groove 51;

[0041] Reverse material adding punch 6, arc surface 61;

[0042] Material 10, protruding boss 101, micro-protruding structure 102. DETAILED DESCRIPTION

[0043] Embodiments of the present application are described in detail below with reference to the accompanying drawings, wherein the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0044] As shown in Figures 1 to 6 A hardware die for forming a protruding boss by material extrusion according to an embodiment of the present application includes an upper die 1, a lower die 2, an extruding punch 3, and an extruding die 4.

[0045] The lower die 2 can be close to or away from the upper die 1, and a stamping space for placing the material 10 is formed between the lower die 2 and the upper die 1. During stamping, the material 10 can be placed in the stamping space, and then the lower die 2 and the upper die 1 are close to each other to extrude the material 10 to form a protruding boss 101.

[0046] The extrusion punch 3 is arranged on the upper die 1, and the end of the extrusion punch 3 is provided with a circular platform 31 and a flat surface 32 connected with the circular platform 31. The extrusion cavity 4 is arranged on the lower die 2, and the extrusion cavity 4 corresponds to the end of the extrusion punch 3. The extrusion cavity 4 is formed with a groove 41 for inserting the extrusion punch 3. During extrusion, the extrusion punch 3 is inserted into the groove 41 to extrude the material into the groove 41 to form the convex boss 101.

[0047] When the material 10 needs to be extruded to form the convex boss 101, the material 10 is first arranged in the stamping space. Since the end of the extrusion punch 3 is provided with the circular platform 31 and the flat surface 32 connected with the circular platform 31, the flat surface 32 first contacts the material during stamping of the extrusion punch 3, and then the circular platform 31 extrudes the side wall of the material 10 to increase the thickness direction of the material 10 in the height direction by using the plasticity of the material 10, so that the height of the convex boss 101 is greater than the thickness of the material 10. Therefore, the plasticity of the material 10 is used to change the flow direction of the material 10, so that the thickness of the material 10 is extruded to increase in the height direction, and the height of the convex boss 101 is greater than the thickness of the material 10.

[0048] Alternatively, the circular platform 31 at the end of the extrusion punch 3 includes a first circular platform 311 and a second circular platform 312. The second circular platform 312 is connected with the first circular platform 311 on one side, and the flat surface 32 is connected with the other side of the second circular platform 312. The taper of the second circular platform 312 is smaller than the taper of the first circular platform 311. In this example, the taper of the second circular platform 312 is 15-25 degrees, and the taper of the first circular platform 311 is 65-75 degrees. That is, the taper K1 of the first circular platform 311 is greater than the taper K2 of the second circular platform 312, so that during extrusion, the flat surface 32 first extrudes the material 10, and then the second circular platform 312 extrudes the side wall of the material 10, thereby using the plasticity of the material 10 to increase the thickness direction of the material 10 in the height direction, so that the height of the convex boss 101 is greater than the thickness of the material 10. Then, the first circular platform 311 extrudes the side wall of the material 10, and the first circular platform 311 of the extrusion punch 3 continues to form extrusion to form more sufficient material 10 supplement, so as to give higher pressure, so that the height of the convex boss 101 reaches the requirement, and the convex boss 101 is full.

[0049] In this example, the height of the second circular platform 312 is greater than or equal to twice the height of the first circular platform 311. As an optimal embodiment, the height of the second circular platform 312 is 1.1 mm, the height of the first circular platform 311 is 0.5 mm, the thickness of the material 10 is usually 1 mm, and the taper of the second circular platform 312 is 20 degrees, and the taper of the first circular platform 311 is 70 degrees. In this way, during extrusion, the flat surface 32 first extrudes the material 10, and then the second circular platform 312 extrudes the side wall of the material 10, thereby using the plasticity of the material 10 to increase the thickness direction of the material 10 in the height direction, so that the height of the convex boss 101 is greater than the thickness of the material 10. Then, the first circular platform 311 extrudes the side wall of the material 10, and the first circular platform 311 of the extrusion punch 3 continues to form extrusion to form more sufficient material 10 supplement, so as to give higher pressure, so that the height of the convex boss 101 reaches the requirement, and the convex boss 101 is full. Figure 4As shown, the second circular platform 312 of the extrusion punch 3 extrudes the sidewall of the material 10, the taper of the second circular platform 312 is 20 degrees, and the thickness of the sidewall B is greater than or equal to 1 / 3 of the material thickness during extrusion, the plasticity of the material 10 is utilized to increase the material 10 in the thickness direction in the height direction, so that the height of the convex boss 101 is greater than the thickness of the material 10, and the material 10 is present at the bottom hole of the material 10, and the first circular platform 311 is continuously formed by the extrusion punch 3, and the taper of the first circular platform 311 is 70 degrees, so that more sufficient material 10 is supplemented, higher pressure is given, the height of the convex boss 101 reaches the requirement, and the convex boss 101 is full.

[0050] That is, by setting the second circular platform 312 and the first circular platform 311, the height of the second circular platform 312 is slightly equal to twice the height of the first circular platform 311, the taper of the second circular platform 312 is 20 degrees, and the taper of the first circular platform 311 is 70 degrees, so that the second circular platform 312 extrudes the sidewall of the material 10 during extrusion of the extrusion punch 3, and the thickness of the sidewall B is greater than or equal to 1 / 3 of the material thickness, which effectively prevents the sidewall B from cracking or material loss. Figure 7 As shown, the traditional extrusion convex boss mode is a cutting extrusion convex boss mode, the sidewall b is relatively thin, and when the thickness of the convex boss of some electronic components needs to be greater than the material thickness, the sidewall b of the traditional extrusion convex boss mode is prone to cracking or material loss.

[0051] The present application cleverly sets the taper of the second circular platform 312 to 20 degrees, the second circular platform 312 preliminarily extrudes the material to form a small package, if the taper of the second circular platform 312 is not set to be greater than the taper of the first circular platform 311, the sidewall B is still prone to cracking or material loss, in order to further prevent the sidewall B from cracking or material loss, the present application further sets the first circular platform 311, the second circular platform 312 preliminarily extrudes the material to form a small package, the first circular platform 311 extrudes the material on the upper side of the second circular platform 312 downward, more sufficient material 10 is supplemented, higher pressure is given, the height of the convex boss 101 reaches the requirement, and the convex boss 101 is full. And the first circular platform 311 extrudes the material on the upper side of the second circular platform 312 downward, so that the material of the sidewall B is more, the density and thickness of the sidewall B are greater, thereby effectively preventing the sidewall B from cracking or material loss. Therefore, compared with the traditional cutting extrusion convex boss mode, the present application can prevent the sidewall B from cracking or material loss, thereby being suitable for some electronic components whose convex boss height is greater than the material thickness.

[0052] In order to prevent the material 10 from being damaged during punching, the second circular platform 312 and the flat surface 32 are connected by a round corner 33 in the present example, so that the convex boss 101 is connected by a curved surface after being formed, and the convex boss 101 is further prevented from cracking.

[0053] In the example, the metal mold for the material adding extrusion forming convex boss further comprises a reverse material adding concave die 5 and a reverse material adding punch 6. The reverse material adding concave die 5 is arranged on the upper die 1, and an arc-shaped groove 51 is arranged in the reverse material adding concave die 5. The reverse material adding punch 6 is arranged on the lower die 2, and the end of the reverse material adding punch 6 corresponds to the reverse material adding concave die 5. The end of the reverse material adding punch 6 is provided with an arc surface 61 which can be inserted into the arc-shaped groove 51 of the reverse material adding concave die 5 so as to form a micro convex structure 102 on the material 10.

[0054] Before the extrusion punch 3 extrudes, the material 10 is arranged in the extrusion space, and the end of the reverse material adding punch 6 is inserted into the arc surface 61 of the arc-shaped groove 51 of the reverse material adding concave die 5 so as to form the micro convex structure 102 on the material 10. In some examples, the depth of the insertion of the reverse material adding punch 6 into the reverse material adding concave die 5 is less than the depth of the insertion of the extrusion punch 3 into the extrusion concave die 4. That is, when the extrusion punch 3 is inserted into the extrusion concave die 4 to the depth, the plasticity of the material 10 is used to change the flow direction of the material 10 so that the material 10 is extruded to increase in the height direction, and the material 10 is slightly convex to form the micro convex structure 102. The height of the micro convex structure 102 can be 0.1mm-0.2mm. Then, the material 10 moves to the position of the extrusion punch 3, and the extrusion punch 3 extrudes the micro convex structure 102 in the opposite direction to form the convex boss 101 by extruding the material 10 in the micro convex structure 102 in the opposite direction, so as to realize the material adding forming convex boss 101, prevent the convex boss 101 from cracking or falling off, and improve the qualified rate.

[0055] When the material 10 moves to the position of the extrusion punch 3 and the extrusion punch 3 extrudes the micro convex structure 102 in the opposite direction, the material of the micro convex structure 102 is more, which can extrude the part of the material in the opposite direction to form the convex boss 101. When the micro convex structure 102 is extruded, the plasticity of the material is used, and the part of the micro convex structure 102 flows to the bottom of the convex boss 101, so that the bottom of the convex boss 101 is not easy to crack or fall off. At the same time, the part of the micro convex structure 102 also flows to the side wall B of the convex boss 101, so that the side wall B is relatively thick, and the side wall B of the convex boss 101 is not easy to crack or fall off. Therefore, the reverse material adding concave die 5 and the reverse material adding punch 6 are arranged to form the micro convex structure 102, so that when the micro convex structure 102 is extruded in the opposite direction, the density and thickness of the side wall B of the convex boss 101 and the bottom of the convex boss 101 are increased, the height of the convex boss 101 reaches the requirement, the convex boss 101 is full, and the convex boss 101 will not crack or fall off.

[0056] As shown in FIG. 1, Figure 7 The traditional extrusion convex boss mode is a cutting extrusion convex boss mode, and the side wall is thin. When the thickness of the convex boss of some electronic components needs to be greater than the thickness of the material, the side wall b of the traditional extrusion convex boss mode is easy to crack or fall off. Figure 4 As shown in FIG. 1,

[0057] As an example, the upper die 1 comprises an upper die seat 11, an upper pad plate 12, a fixed plate 13, a stop plate 14 and an upper stripper plate 15, one end of the extrusion punch 3 is fixed on the upper pad plate 12, the first circular platform 311, the second circular platform 312 and the flat surface 32 of the other end of the extrusion punch 3 protrude from the upper stripper plate 15; the lower die 2 comprises a lower die seat 21, a lower pad plate 22 and a lower die plate 23, the lower die 2 is provided with a stripping elastic element 24, a force transmission ejector rod 25 and a limiting stripping rod 26, the stripping elastic element 24 is arranged in the lower die seat 21, the force transmission ejector rod 25 is arranged in the lower pad plate 22, one end of the force transmission ejector rod 25 is connected with the stripping elastic element 24, the limiting stripping rod 26 is arranged at the other end of the stripping elastic element 24, the extrusion die 4 is arranged in the lower die plate 23, and the extrusion die 4 is connected with the limiting stripping rod 26.

[0058] The stripping elastic element 24 can be a stripping spring, and the convex boss 101 is formed after the stripping spring is arranged, so that the material 10 is easily lifted.

[0059] In some examples, the reverse material increasing die 5 is arranged on the upper stripper plate 15 and located at one side of the extrusion punch 3, one end of the reverse material increasing punch 6 is fixed in the lower die seat 21, and the other end of the reverse material increasing punch 6 protrudes from the lower die plate 23, that is, the curved surface 61 of the reverse material increasing punch 6 protrudes from the lower die plate 23, so that the material 10 is extruded into the reverse material increasing die 5 to form the micro-convex structure 102.

[0060] The application further provides a forming method of the convex boss, comprising the following steps:

[0061] Step S1: the material 10 is arranged in a stamping space in a die;

[0062] Step S2: the reverse material increasing punch 6 is inserted into the reverse material increasing die 5, so that the material 10 is partially increased to form the micro-convex structure 102 in the reverse material increasing die 5;

[0063] Step S3: the material 10 moves to the extrusion punch 3;

[0064] Step S4: the extrusion punch 3 extrudes the micro-convex structure 102 into the extrusion die 4 to form the convex boss 101;

[0065] Step S5: the material 10 moves out of the die.

[0066] When the material 10 needs to be extruded to form the convex boss 101, the material 10 is placed in the stamping space in the die; the reverse material adding punch 6 is inserted into the reverse material adding die 5, so that the material 10 is partially added to the reverse material adding die 5 to form the micro convex structure 102; the material 10 is moved to the extrusion punch 3; the extrusion punch 3 extrudes the micro convex structure 102 into the extrusion die 4 to form the convex boss 101; and the material 10 is moved out of the die. Since the end of the extrusion punch 3 can be provided with the circular truncated cone surface 31 and the flat surface 32 connected with the circular truncated cone surface 31, when the extrusion punch 3 is stamped, the circular truncated cone surface 31 extrudes the side wall of the material 10, and the thickness direction of the material 10 is increased in the height direction by using the plasticity of the material 10, so that the height of the convex boss 101 is greater than the thickness of the material 10. Therefore, the plasticity of the material 10 is utilized to change the flow direction of the material 10, so that the thickness of the material 10 is extruded and increased in the height direction, the height of the convex boss 101 is greater than the thickness of the material 10, and the material adding is realized to form the convex boss 101, so that the situation that the convex boss 101 is cracked or falls off is prevented, and the qualified rate is improved.

[0067] As an example, in step S4, the extrusion punch 3 approaches the lower die 2, the second circular truncated cone surface 312 of the extrusion punch 3 first extrudes the material to form a small package, and then the extrusion punch 3 continues to approach the lower die 2, and the first circular truncated cone surface 311 of the extrusion punch 3 extrudes the material to form the convex boss 101. Since the first circular truncated cone surface 311 of the extrusion punch 3 extrudes the material to form the convex boss 101, the first circular truncated cone surface 311 extrudes the material on the basis of the original small package, so that more sufficient material 10 is added, higher pressure is given, the height of the convex boss 101 reaches the requirement, and the convex boss 101 is full.

[0068] The above embodiments and drawings are not limited to the product shape and style of the present application, and any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the scope of the present application.

Claims

1. A power-boosting extrusion forming male die for a hardware mold, characterized by: The extrusion punch and the extrusion die are arranged on the upper die and the lower die respectively. The lower die is capable of moving close to or away from the upper die, and a stamping space for placing materials is formed between the lower die and the upper die. The extrusion punch is arranged on the upper die, and a circular platform and a flat surface connected with the circular platform are arranged at the end of the extrusion punch. The extrusion die is arranged on the lower die, and the extrusion die corresponds to the end of the extrusion punch, and a groove for inserting the extrusion punch is formed in the extrusion die. The circular platform at the end of the extrusion punch comprises a first circular platform and a second circular platform, the second circular platform is connected with the first circular platform at one side, the flat surface is connected with the other side of the second circular platform, and the taper of the second circular platform is smaller than the taper of the first circular platform. The taper of the second circular platform is 15-25 degrees, the taper of the first circular platform is 65-75 degrees, and the height of the second circular platform is greater than or equal to twice the height of the first circular platform.

2. The compound metal die for overmolding a boss of claim 1, wherein: The second circular platform and the flat surface are connected through a round corner.

3. The compound metal die for overmolding a boss of claim 1, wherein: The reverse material increasing die is arranged on the upper die, and an arc-shaped groove is arranged in the reverse material increasing die.

4. A method of forming a male buckle, using the male buckle forming die of any one of claims 1 to 3, wherein: The reverse material increasing punch is arranged on the lower die, and the end of the reverse material increasing punch corresponds to the reverse material increasing die, and the end of the reverse material increasing punch is provided with an arc surface capable of being inserted into the arc-shaped groove of the reverse material increasing die so as to form a micro-convex structure of the material. The depth of the reverse material increasing punch inserted into the reverse material increasing die is smaller than the depth of the extrusion punch inserted into the extrusion die. The upper die comprises an upper die seat, an upper pad plate, a fixed plate, a stop plate and an upper stripping plate arranged in sequence from top to bottom, one end of the extrusion punch is fixed on the upper pad plate, and the first circular platform, the second circular platform and the flat surface at the other end of the extrusion punch protrude from the upper stripping plate. The lower die comprises a lower die seat, a lower pad plate and a lower die plate arranged in sequence from bottom to top, an elastic stripping piece, a force transmission top rod and a limiting stripping rod are arranged in the lower die, the elastic stripping piece is arranged in the lower die seat, the force transmission top rod is arranged in the lower pad plate, one end of the force transmission top rod is connected with the elastic stripping piece, the limiting stripping rod is arranged at the other end of the elastic stripping piece, the extrusion die is arranged in the lower die plate, and the extrusion die is connected with the limiting stripping rod. The reverse material increasing die is arranged on the upper stripping plate and located at one side of the extrusion punch, and one end of the reverse material increasing punch is fixed in the lower die seat and the other end of the reverse material increasing punch protrudes from the lower die plate. The method comprises the following steps: S1: placing materials in the stamping space in the die; S2: inserting the reverse material increasing punch into the reverse material increasing die to increase the materials in the reverse material increasing die to form a micro-convex structure; S3: moving the materials to the extrusion punch; S4: extruding the micro-convex structure into the extrusion die by the extrusion punch to form a convex bud; S5: moving the materials out of the die.

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