A processing mold and preparation method of fastener

Abstract

The present invention discloses a processing mold and preparation method for a fastener, relating to the field of metal plastic processing technology. The mold comprises a relatively arranged punch and die, the upper end of the punch and the lower end of the die being respectively used to connect to a hydraulic press, the die comprising a first half and a second half, the first half and the second half being fastened together to form an entrance channel, an expansion corner channel, and a torsion channel, the die being provided with a forming slider, the forming slider being provided with an extrusion forming channel, the shape of the extrusion forming channel matching the shape of the fastener, the entrance channel, the expansion corner channel, the torsion channel, and the extrusion forming channel being sequentially connected to form a cavity channel structure, and the blank to be processed is sequentially upset in the entrance channel, sheared in the expansion corner channel, twisted in the torsion channel, and extruded in the extrusion forming channel under the action of the punch. The present invention enables the material to have both high strength and good plastic toughness, and significantly improves its wear resistance and fatigue resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of metal plastic processing, in particular to a processing die and a preparation method of a fastener. Background Art

[0002] The rapid development of my country's aerospace technology and the increasing demand for aircraft reliability have placed stringent performance requirements on fastener materials. Titanium alloys, due to their advantages such as high specific strength, corrosion resistance, fatigue resistance, high temperature resistance, non-magnetic properties, and good compatibility with composite materials, have become the preferred material for advanced aerospace fasteners. Currently, a growing number of titanium alloy fasteners are gradually replacing traditional alloy steel fasteners to meet the urgent needs of high-performance and weight reduction for spacecraft. Titanium alloy bolts are the most widely used aerospace fastener. Most titanium alloys have poor deformability and are prone to defects such as cracking during cold upsetting. Therefore, hot upsetting of high-temperature titanium alloys is the primary method used in production. However, the upsetting process is complex, involving extrusion, upsetting, squaring, and punching. Product quality is affected by a variety of factors, including workpiece structure, dimensional accuracy, materials, equipment, and molds. Furthermore, defects such as surface oxidation, localized burning, and overheating are easily incurred during heating of the blanks, making automated continuous upsetting difficult. This process is labor-intensive, resulting in poor product quality and low production efficiency.

[0003] Therefore, how to break through the bottleneck of existing forming technology, develop and design advanced processing technology, and produce high-performance titanium alloy bolt fasteners with high quality, high efficiency and stability to meet the performance requirements of various types of aircraft is an urgent problem that the industry needs to solve. Summary of the Invention

[0004] The purpose of the present invention is to provide a processing mold and preparation method for a fastener to solve the problems existing in the above-mentioned prior art, which can significantly improve the strength and toughness of the fastener while meeting the shape requirements of the fastener, thereby realizing the integrated shape and property design of high-performance fasteners.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a processing mold for a fastener, comprising a punch and a die arranged relatively to each other, the upper end of the punch and the lower end of the die being respectively used to connect to a hydraulic press, the die comprising a half-die one and a half-die two, the half-die one and the half-die two being buckled together to form an entrance channel, an expansion corner channel and a torsion channel, a forming slider being provided on the die, an extrusion forming channel being provided in the forming slider, the shape of the extrusion forming channel matching the shape of the fastener, the entrance channel, the expansion corner channel, the torsion channel and the extrusion forming channel being connected in sequence to form a cavity channel structure, and the blank to be processed is upset in the entrance channel, sheared in the expansion corner channel, twisted in the torsion channel and extruded in the extrusion forming channel in sequence under the action of the punch.

[0007] Preferably, the inlet channel is vertically arranged, the upper end of the inlet channel is the blank inlet, the lower end of the inlet channel is connected to the expansion corner channel, the cross-sectional shape of the inlet channel is circular, and the length of the inlet channel is the same as the pressing height of the punch processing fastener.

[0008] Preferably, the expansion angle channel includes a vertical channel and a horizontal channel, the upper end of the vertical channel is connected to the lower end of the inlet channel, the lower end of the vertical channel is connected to one end of the horizontal channel through a 90° equal channel angle, and the other end of the horizontal channel is connected to the torsion channel; the cross-sectional shape of the vertical channel is circular, and the cross-sectional size of the vertical channel gradually increases from the upper end of the vertical channel to the lower end of the vertical channel, the cross-sectional size of the upper end of the vertical channel is the same as the cross-sectional size of the inlet channel, and the cross-sectional size of the lower end of the vertical channel is the same as the cross-sectional size of the horizontal channel.

[0009] Preferably, one end of the torsional channel is connected to the other end of the horizontal channel, and the other end of the torsional channel is connected to one end of the extruded channel. The cross-sectional shape of one end of the torsional channel and the cross-sectional shape of the other end of the torsional channel are both circular. The cross-sectional size of one end of the torsional channel is the same as the cross-sectional size of the other end of the horizontal channel, and the cross-sectional size of the other end of the torsional channel is the same as the cross-sectional size of one end of the extruded channel. The cross-sectional shape of the torsional channel transitions from a circle to an initial ellipse, gradually twists from the initial ellipse to a final ellipse, and transitions from the final ellipse to a circle from one end of the torsional channel to the other end of the torsional channel, and the major axis of the initial ellipse is perpendicular to the major axis of the final ellipse.

[0010] Preferably, the extrusion forming channel includes a head channel and a threaded screw channel, one end of the head channel is connected to the other end of the torsion channel, the cross-sectional size of one end of the head channel is the same as the cross-sectional size of the other end of the torsion channel, the other end of the head channel is connected to the screw thread channel, the cross-sectional shape of the head channel is circular, and the cross-sectional size of the head channel gradually decreases from one end of the head channel to the other end of the head channel.

[0011] Preferably, the sum of the volumes of the inlet channel, the expansion corner channel, and the torsion channel is the same as the volume of the blank to be processed, and the volume of the extrusion forming channel is the same as the volume of the blank to be processed.

[0012] Preferably, both the first and second half molds are provided with slider holes, the slider holes are wedge-shaped, the forming slider and the slider baffle are provided in the slider holes, and the slider baffle is fitted with the forming slider;

[0013] The slide hole is provided with an air vent hole, and the air vent hole is connected to the atmosphere;

[0014] The forming slide and the slide baffle are detachably connected to the first half mold or the second half mold respectively through tightening bolts;

[0015] A limiting side plate is provided on the outer side of the forming slider and the slider baffle, and the limiting side plate is detachably connected to the half mold 1 or the half mold 2 via side plate bolts;

[0016] The axis of the clamping bolt is perpendicular to the axis of the side plate bolt.

[0017] Preferably, an upper template is provided at the upper end of the male die, and the upper template is used to connect with the upper slide of the hydraulic press; and a lower template is provided at the lower end of the female die, and the lower template is used to connect with the workbench of the hydraulic press;

[0018] The first half mold and the second half mold are detachably connected via positioning pins and fixing bolts.

[0019] Preferably, a plurality of heating rod holes are opened on the die, and the heating rod holes are used to place heating rods, and each of the heating rod holes is located outside the inlet channel, the expansion corner channel, the torsion channel and the extrusion forming channel.

[0020] The present invention also provides a method for preparing a fastener using the fastener processing mold, comprising the following steps:

[0021] Step 1: manufacturing a processing mold for the fastener according to the cavity channel structure;

[0022] Step 2: Assemble the processing mold of the fastener, with the concave mold installed on the workbench of the hydraulic press and the punch installed on the upper slide of the hydraulic press;

[0023] Step 3: Preheat the fastener processing mold according to the process requirements, and heat and keep the blank to be processed;

[0024] Step 4: Place the blank to be processed into the inlet channel, start the hydraulic press, press the punch down to a specified height, and return the hydraulic press;

[0025] Step 5: Take out the forming slider from the die;

[0026] Step 6: taking the prepared fastener out of the forming slider;

[0027] Step 7: Install the replaced forming slider;

[0028] Step 8. Repeat steps 4 to 7.

[0029] Compared with the prior art, the present invention has achieved the following technical effects:

[0030] The present invention introduces the upsetting-torsion-extrusion composite strong plastic deformation technology in the fastener preparation process, and utilizes the continuous transition change of the cross-sectional shape and size of the cavity channel structure and the deformation advantage of torsional shear to generate asymmetric shear stress, large gradient strain and high hydrostatic pressure, which helps to obtain a gradient structure ultrafine grain structure under relatively low deformation temperature conditions, improve the low-temperature forming performance of the material, and form a gradient distribution change of the grain size of the material from the surface to the core, thereby improving the tissue refinement effect and the comprehensive performance of the material, so that the material has both high strength and good plastic toughness, and significantly improves its wear resistance and fatigue resistance, and prepares high-strength and tough fasteners with a gradient size distribution ultrafine grain structure and shape and size that meet the use requirements, thereby providing a new idea for the integrated control of the shape and properties of high-performance aviation fasteners. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a front view of a processing mold for a fastener of the present invention;

[0033] Figure 2 A side view of a processing mold for a fastener of the present invention;

[0034] Figure 3for Figure 2 AA cross-sectional view;

[0035] Figure 4 A schematic diagram of a half mold of the present invention;

[0036] Figure 5 This is a schematic diagram of the second half mold of the present invention;

[0037] Among them: 100-fastener processing mold, 1-upper template, 2-punch fixing plate, 3-punch, 4-die, 5-limiting side plate, 6-slider baffle, 7-forming slider, 8-lower template, 41-half mold one, 42-half mold two, 43-clamping bolt, 44-fixing bolt, 45-side plate bolt, 46-locating pin, 47-heating rod hole, 421-slider hole, 422-entrance channel, 423-expansion corner channel, 424-torsion channel, 425-vent hole, 51-extrusion forming channel. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The purpose of the present invention is to provide a processing mold and preparation method for a fastener to solve the problems existing in the above-mentioned prior art, which can significantly improve the strength and toughness of the fastener while meeting the shape requirements of the fastener, thereby realizing the integrated shape and property design of high-performance fasteners.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] like Figure 1-Figure 5As shown: This embodiment provides a fastener processing mold 100, including a punch 3 and a die 4 arranged relatively to each other, the upper end of the punch 3 and the lower end of the die 4 are respectively used to connect to the hydraulic press, the die 4 includes a half die 1 41 and a half die 2 42, the half die 1 41 and the half die 2 42 are buckled together to form an entrance channel 422, an expansion corner channel 423 and a torsion channel 424, a forming slider 7 is provided on the die 4, an extrusion forming channel 51 is provided in the forming slider 7, the shape of the extrusion forming channel 51 matches the shape of the fastener, the entrance channel 422, the expansion corner channel 423, the torsion channel 424 and the extrusion forming channel 51 are connected in sequence to form a cavity channel structure, and the blank to be processed is upset in the entrance channel 422, sheared in the expansion corner channel 423, twisted in the torsion channel 424, and extruded in the extrusion forming channel 51 under the action of the punch 3. This embodiment introduces the upsetting-torsion-extrusion composite strong plastic deformation technology in the fastener preparation process, and utilizes the continuous transition change of the cross-sectional shape and size of the cavity channel structure and the deformation advantage of torsional shear to generate asymmetric shear stress, large gradient strain and high hydrostatic pressure, which helps to obtain a gradient structure ultrafine grain structure under relatively low deformation temperature conditions, improve the low-temperature forming performance of the material, and form a gradient distribution change of the grain size of the material from the surface to the core, thereby improving the microstructure refinement effect and the comprehensive performance of the material, so that the material has both high strength and good plasticity and toughness, and significantly improves its wear resistance and fatigue resistance, and prepares high-strength and tough fasteners with a gradient size distribution ultrafine grain structure and a shape and size that meet the use requirements, thereby providing a new idea for the integrated control of the shape and properties of high-performance aviation fasteners.

[0043] In this embodiment, an upper template 1 is provided at the upper end of the punch 3, and the upper template 1 is used to connect with the upper slider of the hydraulic press. A lower template 8 is provided at the lower end of the die 4, and the lower template 8 is used to connect with the workbench of the hydraulic press. Half mold 1 41 and half mold 2 42 can be detachably connected by positioning pins 46 and fixing bolts 44.

[0044] In this embodiment, a plurality of heating rod holes 47 are provided on the die 4 for placing heating rods. Each heating rod hole 47 is located outside the inlet channel 422 , the expansion corner channel 423 , the torsion channel 424 and the extrusion forming channel 51 .

[0045] In this embodiment, the inlet channel 422 is vertically arranged, the upper end of the inlet channel 422 is the blank inlet, the lower end of the inlet channel 422 is connected to the expansion corner channel 423, the cross-sectional shape of the inlet channel 422 is circular, and the length of the inlet channel 422 is the same as the downward pressing height of the punch 3 for processing the fastener.

[0046] In this embodiment, the expansion corner channel 423 includes a vertical channel and a horizontal channel. The upper end of the vertical channel is connected to the lower end of the inlet channel 422, the lower end of the vertical channel is connected to one end of the horizontal channel through a 90° equal channel angle, and the other end of the horizontal channel is connected to the torsion channel 424; the cross-sectional shape of the vertical channel is circular, and the cross-sectional size of the vertical channel gradually increases from the upper end of the vertical channel to the lower end of the vertical channel. The cross-sectional size of the upper end of the vertical channel is the same as the cross-sectional size of the inlet channel 422, and the cross-sectional size of the lower end of the vertical channel is the same as the cross-sectional size of the horizontal channel.

[0047] In this embodiment, one end of the torsional channel 424 is connected to the other end of the horizontal channel, and the other end of the torsional channel 424 is connected to one end of the extrusion forming channel 51. The cross-sectional shape of one end of the torsional channel 424 and the cross-sectional shape of the other end of the torsional channel 424 are both circular. The cross-sectional dimensions of one end of the torsional channel 424 are the same as the cross-sectional dimensions of the other end of the horizontal channel, and the cross-sectional dimensions of the other end of the torsional channel 424 are the same as the cross-sectional dimensions of one end of the extrusion forming channel 51. The cross-sectional area of ​​the torsional channel 424 is the same at all locations. The cross-sectional shape of the torsional channel 424 transitions from a circle to an initial ellipse, then gradually twists from the initial ellipse to a final ellipse, and then transitions from the final ellipse to a circle. The dimensions of the circular cross-sectional shape after the transition are the same as those of the horizontal channel. The initial ellipse is twisted 90° to the final ellipse, i.e., the major axis of the initial ellipse is perpendicular to the major axis of the final ellipse. The dimensions and ratio of the major axis to the minor axis of the initial and final ellipses can be adjusted according to process requirements.

[0048] In this embodiment, the extrusion forming channel 51 includes a head channel and a threaded screw channel. One end of the head channel is connected to the other end of the torsion channel 424. The cross-sectional size of one end of the head channel is the same as the cross-sectional size of the other end of the torsion channel 424. The other end of the head channel is connected to the screw thread channel. The cross-sectional shape of the head channel is circular, and the cross-sectional size of the head channel gradually decreases from one end of the head channel to the other end of the head channel.

[0049] In this embodiment, the sum of the volumes of the inlet channel 422 , the expansion corner channel 423 , and the torsion channel 424 is the same as the volume of the blank to be processed, and the volume of the extrusion forming channel 51 is the same as the volume of the blank to be processed.

[0050] In this embodiment, both half mold 1 41 and half mold 2 42 are provided with a slider hole 421, and the slider hole 421 is wedge-shaped. The forming slider 7 and the slider baffle 6 are arranged in the slider hole 421, and the slider baffle 6 is in contact with the forming slider 7; the slider hole 421 is provided with an air vent 425, and the air vent 425 is connected to the atmosphere; the forming slider 7 and the slider baffle 6 are detachably connected to half mold 1 41 or half mold 2 42 respectively through the clamping bolt 43; limiting side plates 5 are provided on both sides of the forming slider 7 and the slider baffle 6, and the limiting side plates 5 are detachably connected to half mold 1 41 or half mold 2 42 through the side plate bolts 45; the axis of the clamping bolt 43 is perpendicular to the axis of the side plate bolt 45.

[0051] In this embodiment, the forming slider 7 can adopt a wedge-shaped, integrated structure or a split structure. In the split structure, the forming slider 7 comprises two half sliders, which are fastened together to form the extrusion forming channel 51. The two half sliders are respectively located in the slider holes 421 of the first mold half 41 and the second mold half 42. The half slider and the slider baffle 6 in the same slider hole 421 are detachably connected to the first mold half 41 or the second mold half 42 via a clamping bolt 43. The outer side of the half slider and the slider baffle 6 on the same side are provided with a limit plate 5.

[0052] In this embodiment, the forming slider 7 is used in conjunction with the slider baffle 6, the limit baffle, and the clamping bolt 43. Installation and coordination: The forming slider 7 is installed in the slider hole 421, and the wedge-shaped position with the slider hole 421 limits its height freedom; the limit baffle limits its longitudinal freedom, ensuring the positioning connection between the extrusion forming channel 51 and the torsion channel 424; the slider baffle 6 and the clamping bolt 43 limit the horizontal lateral freedom of the forming slider 7. Quick disassembly method: Removing the slider baffle 6 cancels the longitudinal freedom; removing the clamping bolt 43 and the slider baffle 6 cancels the horizontal lateral freedom; the forming slider 7 can be removed in both the horizontal wedge direction and the longitudinal direction. Multiple sets of forming sliders 7 can be prepared and used alternately to achieve rapid and continuous production of fasteners.

[0053] The replacement forming slider 7 proposed in this embodiment and the structural design of the die 4 have the advantages of both excellent forming performance and high production efficiency. On the one hand, it ensures high-precision forming of the fastener shape. On the other hand, the forming slider 7 can be quickly replaced to form continuous production capacity, which is suitable for high-efficiency, high-quality and continuous production of fasteners made of difficult-to-deform materials.

[0054] Example 2

[0055] This embodiment also provides a method for preparing a fastener using the fastener processing mold 100 of the first embodiment. In this embodiment, a homogenized TC4 (Ti-6Al-4V) titanium alloy round rod ingot is used as the blank to be processed, and the fastener is a bolt. This embodiment is also suitable for the manufacture of fasteners made of other difficult-to-deform lightweight metal materials, and includes the following steps:

[0056] Step 1: Manufacturing a fastener processing mold 100 according to the cavity channel structure;

[0057] Step 2: Assemble the processing mold 100 for the fastener. Specifically, assemble the mold half 41 and the mold half 42 using the positioning pins 46 and the fixing bolts 44, and fix them to the lower mold plate 8. Apply a high-temperature release agent to the inner surface of the slider hole 421. Install the forming slider 7 and the slider baffle 6 into the slider hole 421 and limit them by the limiting side plate 5 and the clamping bolts 43. The die 4 is mounted on the workbench of the hydraulic press through the lower mold plate 8. The punch 3 is installed in the punch fixing plate 2 and installed to the upper mold plate 1. The punch 3 is mounted on the upper slider of the hydraulic press through the upper mold plate 1.

[0058] Step 3: Preheat the fastener processing mold 100 according to the process requirements. The preheating temperature of the fastener processing mold 100 is 320°C. The blank to be processed is heated and kept warm. The preheating temperature of the blank to be processed is 350°C. The blank to be processed is removed from the electric furnace, a high-temperature lubricant is applied to the outer surface of the blank to be processed, and the blank is quickly placed into the inlet channel 422.

[0059] Step 4: Place the blank to be processed through the inlet channel 422, apply high-temperature lubricant on the outer surface of the punch 3, start the hydraulic press, press the punch 3 down to a specified height, and return the hydraulic press;

[0060] This embodiment adopts a discharging method in which the last blank to be processed pushes out the previous blank to be processed (i.e., "material pushing material"). Based on the forming principle of two blanks to be processed to extrude a fastener, the volume conversion relationship between the cavity channel structure and the single blank to be processed is utilized to determine the entrance of the expansion channel as the downward pressure height position of the bolt forming punch 3;

[0061] According to the law of constant volume (the volume of metal remains unchanged during plastic deformation), the volume V of the cavity channel structure is calculated. The cross-sectional area of ​​the blank to be processed is S, and the height H required to fill the blank to be processed can be obtained as H = V / S;

[0062] Step 5: Unscrew the clamping bolt 43, remove the limit side plate 5, remove the slider baffle 6, and remove the forming slider 7 in the die 4;

[0063] Step 6: Take the prepared fastener out of the forming slider 7 and clean the cavity of the forming slider 7 for future use;

[0064] Step 7: Install the replacement forming slider 7, install the slider baffle 6, install the limiting side plate 5, and tighten the clamping bolt 43;

[0065] Step 8. Repeat steps 4 to 7 to achieve continuous high-quality production.

[0066] This embodiment introduces the upsetting-torsion-extrusion composite strong plastic deformation technology to generate high hydrostatic pressure and large shear strain inside the material, thereby improving the material's low-temperature forming ability, increasing the material's strength and toughness and the fastener forming efficiency, and realizing the forming and characterization integration of the fastener preparation process.

[0067] This embodiment causes the blank to be processed to undergo a variety of deformation forms such as upsetting, shearing, torsion, and extrusion in a single extrusion process. By utilizing the continuous transition changes in the cross-sectional shape and size of the cavity channel structure and the deformation advantages of torsional shear, asymmetric shear stress, large gradient strain, and high hydrostatic pressure can be generated inside the material, forming a gradient distribution change in the grain size of the material from the surface to the core, thereby improving the microstructure refinement effect and the comprehensive performance of the material, and preparing a high-strength and tough fastener with an ultrafine grain microstructure with a gradient size distribution and a shape and size that meets the use requirements.

[0068] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A fastener processing mold, characterized in that: The invention comprises a punch and a die arranged opposite to each other, wherein the upper end of the punch and the lower end of the die are respectively used to be connected to a hydraulic press, the die comprises a first half and a second half, the first half and the second half are buckled together to form an inlet channel, an expansion corner channel and a torsion channel, the die is provided with a forming slider, an extrusion forming channel is provided in the forming slider, the shape of the extrusion forming channel matches the shape of the fastener, the inlet channel, the expansion corner channel, the torsion channel and the extrusion forming channel are sequentially connected to form a cavity channel structure, and the blank to be processed is sequentially upset in the inlet channel, sheared in the expansion corner channel, twisted in the torsion channel, and extruded in the extrusion forming channel under the action of the punch; The expansion angle channel includes a vertical channel and a horizontal channel, the upper end of the vertical channel is connected to the lower end of the inlet channel, and the lower end of the vertical channel is connected to one end of the horizontal channel through a 90° equal channel angle; One end of the torsion channel is communicated with the other end of the horizontal channel, and the other end of the torsion channel is communicated with one end of the extruded channel. The cross-sectional shape of one end of the torsion channel and the cross-sectional shape of the other end of the torsion channel are both circular. The cross-sectional dimensions of one end of the torsion channel are the same as the cross-sectional dimensions of the other end of the horizontal channel, and the cross-sectional dimensions of the other end of the torsion channel are the same as the cross-sectional dimensions of one end of the extruded channel. The cross-sectional areas of all locations of the torsion channel are the same. The cross-sectional shape of the torsion channel transitions from a circle to an initial ellipse, gradually twists from the initial ellipse to a final ellipse, and transitions from the final ellipse to a circle from one end of the torsion channel to the other end of the torsion channel. The major axis of the initial ellipse is perpendicular to the major axis of the final ellipse. The extrusion forming channel includes a head channel and a threaded screw channel, one end of the head channel is connected to the other end of the torsion channel, the cross-sectional size of the one end of the head channel is the same as the cross-sectional size of the other end of the torsion channel, the other end of the head channel is connected to the threaded screw channel, the cross-sectional shape of the head channel is circular, and the cross-sectional size of the head channel gradually decreases from one end of the head channel to the other end of the head channel; Both half mold one and half mold two are provided with slider holes, the slider holes are wedge-shaped, the forming slider and the slider baffle are arranged in the slider holes, and the slider baffle is in contact with the forming slider; the slider hole is provided with an air vent hole, and the air vent hole is connected to the atmosphere; the forming slider and the slider baffle are detachably connected to the half mold one or the half mold two respectively through clamping bolts; limiting side plates are provided on the outer sides of the forming slider and the slider baffle, and the limiting side plates are detachably connected to the half mold one or the half mold two through side plate bolts; the axis of the clamping bolt is perpendicular to the axis of the side plate bolt.

2. The fastener processing mold according to claim 1, characterized in that: The upper end of the male die is provided with an upper template, and the upper template is used to connect with the upper slide of the hydraulic press. The lower end of the female die is provided with a lower template, and the lower template is used to connect with the workbench of the hydraulic press. The first half mold and the second half mold are detachably connected via positioning pins and fixing bolts.

3. The fastener processing mold according to claim 1, characterized in that: The die is provided with a plurality of heating rod holes for placing heating rods, and each of the heating rod holes is located outside the inlet channel, the expansion corner channel, the torsion channel and the extrusion forming channel.

4. The fastener processing mold according to claim 1, characterized in that: The inlet channel is vertically arranged, the upper end of the inlet channel is the blank inlet, the lower end of the inlet channel is connected to the expansion corner channel, the cross-section of the inlet channel is circular, and the length of the inlet channel is the same as the pressing height of the punch processing fastener; The other end of the horizontal channel is connected to the torsion channel; the cross-sectional shape of the vertical channel is circular, and the cross-sectional size of the vertical channel gradually increases from the upper end of the vertical channel to the lower end of the vertical channel, the cross-sectional size of the upper end of the vertical channel is the same as the cross-sectional size of the inlet channel, and the cross-sectional size of the lower end of the vertical channel is the same as the cross-sectional size of the horizontal channel; The sum of the volumes of the inlet channel, the expansion corner channel, and the torsion channel is the same as the volume of the blank to be processed, and the volume of the extrusion forming channel is the same as the volume of the blank to be processed.

5. A method for producing a fastener using the fastener processing mold according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: manufacturing a processing mold for the fastener according to the cavity channel structure; Step 2: Assemble the processing mold of the fastener, with the concave mold installed on the workbench of the hydraulic press and the punch installed on the upper slide of the hydraulic press; Step 3: Preheat the fastener processing mold according to the process requirements, and heat and keep the blank to be processed; Step 4: Place the blank to be processed into the inlet channel, start the hydraulic press, press the punch down to a specified height, and return the hydraulic press; Step 5: Take out the forming slider from the die; Step 6: taking the prepared fastener out of the forming slider; Step 7: Install the replaced forming slider; Step 8. Repeat steps 4 to 7.

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