A mold for preparing fasteners and a method for preparing the same

Abstract

The present invention relates to the technical field of fastener preparation molds, specifically a fastener preparation mold and preparation method, including a stamping die set, a lift-out mold assembly is provided at the middle end of the stamping die set, and a molding module is provided at the middle end of the inner cavity of the lift-out mold assembly, a reverse buffer mechanism is connected to the bottom end of the lift-out mold assembly, a parting line is provided in the closed mold in the lift-out mold assembly, a mold cavity is provided at the middle end of the parting line, and an expansion cone wall is provided at the bottom end of the mold cavity. In order to allow the molded blank to be smoothly taken out without friction in the mold, a closed mold and a lift-out cone pile are combined, and the lift-out cone pile with a conical structure cooperates with the expansion cone wall to synchronously unfold and lift, so that the blank in the mold can be taken out stably and without damage, thereby reducing the friction between the blank itself and the inner wall of the mold, improving the overall fastener processing and preparation quality, and reducing the loss of the mold itself.

Description

Technical Field

[0001] The invention relates to the technical field of fastener processing equipment, in particular to a mold for preparing a fastener and a preparation method thereof. Background Art

[0002] Fasteners are a type of mechanical parts used for fastening connections and are extremely widely used. Common fasteners mainly include screws, nuts and bolts. The production of fasteners mainly includes wire pickling, annealing, secondary pickling, wire drawing, forming, rolling, heat treatment and electroplating. In the fastener molding and manufacturing process, cold heading is mainly used. By utilizing the plastic deformation of metal under the action of external force, and cooperating with the mold to redistribute and transfer the metal volume, the required parts or blanks are formed. The cold heading process is most suitable for the production of standard fasteners such as bolts, screws, nuts, rivets, pins, etc. The commonly used equipment for the cold heading process is mainly a special cold heading machine.

[0003] In the forming process, it is necessary to use a cold heading machine in conjunction with a mold, and the corresponding molding mold is used in conjunction with the stamping end to realize the molding process of the blank. The corresponding molding mold used in the cold heading process of the traditional cold heading machine is mainly an integrated structure. When in use, the accessories need to be placed in the mold. After the blank is molded by cold heading, the molded blank is ejected from the inside of the mold through the ejection mechanism.

[0004] When the above-mentioned mold is undergoing cold heading processing, the molded fastener blank needs to be ejected after the molding process is completed. Before ejection, the molded blank will be in a tight fit with the inner wall of the molding mold. In the subsequent ejection process, the blank will produce friction with the inner wall of the molding mold, and the friction process can easily cause scratches on the outer wall of the fastener blank. If the ejection structure is subjected to excessive force, the blank will also be deformed, and the inner wall of the molding mold will also be worn, seriously affecting the molding quality of the fastener and the overall processing efficiency.

[0005] In view of the above problems, we propose a mold and a method for preparing a fastener. Summary of the invention

[0006] The object of the present invention is to provide a mold and a method for preparing a fastener to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mold for preparing fasteners, comprising a stamping die set, a lifting mold assembly is arranged at the middle end of the stamping die set, and a molding module is arranged at the middle end of the inner cavity of the lifting mold assembly, and a reverse buffer mechanism is connected to the bottom end of the lifting mold assembly, the lifting mold assembly comprises a closing module, a parting line, a mold cavity, an expansion cone wall, a connecting pile, a lifting cone pile, a positioning outer rail, a positioning frame, a hydraulic cylinder and an expansion frame, and a parting line is opened at the middle end of the closing module, a mold cavity is arranged at the middle end of the parting line, and an expansion cone wall is arranged at the bottom end of the mold cavity, a connecting pile is arranged at the bottom end of the expansion cone wall, and a lifting cone pile is fixed to the top surface of the connecting pile, and positioning outer rails are arranged on the outer walls on both sides of the parting line, positioning frames are distributed at both ends of the closing module, and a hydraulic cylinder is connected to an inner wall of one side of the positioning frame, and an expansion frame is connected to one side of the hydraulic cylinder.

[0008] Furthermore, the closing module is divided symmetrically along both sides of the parting line, and the closing module forms a telescopic structure with the stamping die set through a hydraulic cylinder and a positioning frame.

[0009] Furthermore, the bottom end of the mold cavity and the expansion cone wall are integrated, and the jacking cone pile is in contact with the inner wall of the bottom end of the expansion cone wall.

[0010] Furthermore, the stamping die set includes a main die frame, a cold molding table, a blank groove, a template frame, a frame pile, a pallet, a stamping die, a top frame and a support rod. The cold molding table is fixed to the middle top surface of the main die frame, and blank grooves are opened on both sides of the top surface of the cold molding table. The middle end of the cold molding table is provided with a template frame, and the bottom end of the template frame is provided with a frame pile, pallet plates are distributed on the outer walls around the frame pile, and a stamping die is provided on the center top of the template frame, the top end of the stamping die is connected to the top frame, and support rods are distributed around the top frame.

[0011] Furthermore, the template frame forms a detachable structure through the frame piles and the cold molding table, and the middle of the bottom end of the stamping module and the middle of the top surface of the template frame are symmetrical about the Y axis.

[0012] Furthermore, the molding module includes a cavity frame, a buckle frame, a docking slat, a slat bolt, a top ring platform, an inner groove and a protrusion, and buckle frames are distributed on both sides of the cavity frame, the middle ends of both sides of the cavity frame are connected to the docking slats, and slat bolts are distributed around the docking slats, a top ring platform is arranged at the top of the cavity frame, inner grooves are distributed on both sides of the middle end of the cavity frame, and protrusions are arranged equidistantly in the Y-axis direction of the inner grooves.

[0013] Furthermore, the buckle frame and the docking strips are symmetrically distributed along the two sides of the mold cavity frame, and the mold cavity frame forms a detachable structure with the ejection mold assembly through the docking strips and the strip bolts.

[0014] Furthermore, the reverse buffer mechanism includes a lifting cylinder, a lifting rod, a linkage rod, a pressure sensor and a damping rod, and a lifting rod is arranged at the top end of the lifting cylinder, linkage rods are distributed on both sides of the lifting rod, and a pressure sensor is arranged on the top surface of one end of the linkage rod, and the damping rod is connected to the top end of the pressure sensor.

[0015] Furthermore, the linkage platform rod forms a lifting structure through a lifting rod and a lifting cylinder, and both ends of the damping rod are connected to a pressure sensor and a lifting and ejecting mold assembly.

[0016] A method for preparing a fastener, applied to the mold for preparing the fastener, comprises the following steps:

[0017] S1. Combine the main mold frame with the template frame, and engage the piles at the bottom of the template frame and the surrounding pallets with the middle position of the cold molding table of the main mold frame. Then make sure that the support rods around the cold molding table are stably placed and uniform in size, and combine the stamping module with the bottom of the top frame, while keeping the center of the stamping die at the bottom of the stamping module aligned with the center of the closed module below;

[0018] S2. After the overall mold structure is assembled, the closed mold is expanded from the center of the pile to both ends through the hydraulic cylinders connected at both ends. Then the user puts the corresponding fastener blank into the mold cavity so that the bottom of the blank fits with the top of the jacking cone pile and is placed stably. Then the hydraulic cylinder is opened to reclose the closed mold to keep the internal blank fit and placed;

[0019] S3. After the blank is placed, the stamping die at the bottom of the stamping die is pressed downward, so that the inner wall of the mold cavity frame around the blank and the center of the mold is instantly cold-pressed and molded;

[0020] S4. After the molding of the blank is completed, the connecting pile connected to the top is driven by the lifting cylinder to rise, and then the lifting cone pile at the top of the connecting pile lifts the expansion cone wall opened at the bottom of the closed module, so that the entire expansion cone wall and the middle of the closed module are synchronously expanded, and at the same time, the inner walls of the two sets of cavity frames in the closed module are loosened to fit the outer walls around the blank after molding;

[0021] S5. As the two sets of cavity frames unfold, the jacking cone piles at their bottom continue to lift synchronously, forming an expanding and lifting state, so that the blank and the inner wall of the mold rise without friction. Then the jacking cone piles rise to the center height of the closed mold. The user takes out the finished blank and puts in a new blank to continue the molding preparation, and repeats this process.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In the present invention, in order to allow the molded blank to be smoothly taken out without friction in the mold, a closed mold is combined with a jacking cone pile, and the jacking cone pile of the conical structure cooperates with the expansion cone wall to synchronously expand and jack up, and in order to maintain the stability of the force and the stability of the jacking process, a reverse buffering method is used to reduce the influence of the jacking force, so that the blank in the mold can be taken out stably without damage, thereby reducing the friction between the blank itself and the inner wall of the mold, improving the overall fastener processing and preparation quality, and reducing the loss of the mold itself;

[0024] In the present invention, in order to maintain the accuracy of the stamping die in the middle of the bottom end of the stamping die to the center of the bottom template frame during the stamping process, the top of the stamping die is connected by a top frame, and each group of top frames is supported by support rods distributed equidistantly around to maintain the horizontal stability of the entire stamping die, so that the center of the bottom end of the stamping die and the center of the template frame are kept flush and aligned on the Y-axis position, so that the stamping die at the bottom end of the stamping die can stably enter the mold during the working process to perform the stamping molding process, avoiding the phenomenon of inaccurate position alignment of the stamping die and offset;

[0025] In the present invention, in order to improve the adaptability in the process of processing fastener blanks of different specifications, a replaceable mold cavity frame is adopted, and the distributed buckle frames on both sides of the mold cavity frame are buckled with the inner wall of the closed mold center, so as to form the mold center, and the two sets of mold cavity frames are combined to form an inner cavity structure, and the blank is placed in the cavity for molding. Not only can the docking be kept stable by the combination of the inner groove and the protrusion during the closing process, but also when dealing with fastener blanks of different specifications, the mold cavity frame itself can also be replaced by the disassembly structure, and the adaptability is improved on the basis of the original blank molding, so that the mold not only has a wide range of application for fastener molding, but also can be taken out and replaced or repaired when worn out for a long time, saving materials;

[0026] In the present invention, the two ends of the jacking rod are connected with the pressure sensor and the damping rod through the linkage rod. When the jacking cylinder drives the jacking rod and the connecting pile to perform jacking, the linkage rods at both ends of the jacking rod can buffer the upward jacking force of the jacking cylinder through the connected damping rod, thereby reducing the inertia of the jacking force and maintaining the stability of the jacking process. The spoke-type pressure sensor is connected to the bottom ends of the two groups of damping rods, which can facilitate the user to observe the stress condition of the damping rod during the jacking process during the caching and jacking force process, thereby facilitating subsequent debugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the stamping die set of the present invention;

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the stamping die template frame of the present invention;

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the jacking and ejecting mold assembly of the present invention;

[0030] Figure 4 This is a schematic diagram of the internal structure of the ejection mold assembly of the present invention;

[0031] Figure 5 This is a schematic diagram of the three-dimensional structure of the shaping module of the present invention;

[0032] Figure 6 This is a schematic diagram of the exploded structure of the molding module of the present invention;

[0033] Figure 7 It is a schematic diagram of the three-dimensional structure of the reverse buffer mechanism of the present invention;

[0034] Figure 8 The present invention is a flow chart for preparing the fastener.

[0035] In the figure: 1. stamping die set; 101. main die frame; 102. cold molding table; 103. blank slot; 104. template frame; 105. frame pile; 106. cardboard; 107. stamping die; 108. top frame; 109. support rod; 2. lifting die assembly; 201. closing die; 202. parting line; 203. die cavity; 204. expansion cone wall; 205. connection pile; 206. lifting cone pile; 207. fixed 1. Outer rail; 208. Positioning frame; 209. Hydraulic cylinder; 210. Expansion frame; 3. Molding module; 301. Cavity frame; 302. Buckle frame; 303. Docking slats; 304. Slat bolts; 305. Top ring platform; 306. Inner groove; 307. Bump; 4. Reverse buffer mechanism; 401. Lifting cylinder; 402. Lifting rod; 403. Linkage platform rod; 404. Pressure sensing module; 405. Damping rod. DETAILED DESCRIPTION

[0036] In order to facilitate the problem to be solved, the embodiment of the present invention provides a mold and a method for preparing a fastener. The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] like Figures 1 to 8As shown, a mold for preparing fasteners includes a stamping die set 1; a lifting die assembly 2 is provided at the middle end of the stamping die set 1, and a molding module 3 is provided at the middle end of the inner cavity of the lifting die assembly 2, and a reverse buffer mechanism 4 is connected to the bottom end of the lifting die assembly 2. The stamping die set 1 includes a main mold frame 101, a cold molding table 102, a blank groove 103, a template frame 104, a frame pile 105, a card board 106, a stamping die 107, a top frame 108 and a support rod 109. The main mold frame 1 A cold molding table 102 is fixed on the middle top surface of 01, and blank grooves 103 are opened on both sides of the top surface of the cold molding table 102, a template frame 104 is arranged at the middle end of the cold molding table 102, and a frame pile 105 is arranged at the bottom end of the template frame 104, and a clamping plate 106 is distributed around the outer wall of the frame pile 105, and a stamping die 107 is arranged at the center top of the template frame 104, and a top frame 108 is connected to the top of the stamping die 107, and support rods 109 are distributed around the top frame 108;

[0038] In order to facilitate the inspection and maintenance of the mold during long-term use, the template frame 104 is arranged in an integrated combination manner, such as Figures 1 to 8 As shown, the template frame 104 of this device is arranged on the top surface of the cold molding table 102 of the main mold frame 101 in a partitioned manner, and the template frame 104 itself is connected to the top-lifting mold assembly 2 to form an integrated structure, so that the operator can disassemble and assemble with the cold molding table 102 through the frame pile 105 at the bottom during maintenance and inspection, and the outer wall parts around the frame pile 105 are all distributed with the same size of the card plate 106, which can be disassembled after the inspection and maintenance is completed and assembled to keep the overall template frame 104 and the connected top-lifting mold assembly 2 and the installation position of the entire cold molding table 102 stable, so as to facilitate the subsequent accurate stamping and molding of the installed blank;

[0039] In order to maintain the accuracy of the stamping die at the middle of the bottom end of the stamping die 107 to the center of the bottom template frame 104 during the stamping process, as shown in FIG. Figures 1 to 8 As shown, the middle of the bottom end of the stamping die 107 is symmetrical with the middle end of the top surface of the template frame 104 on the Y axis, and is connected by a top frame 108 at the top of the stamping die 107. At the same time, each group of top frames 108 are supported by equidistant support rods 109 on all sides to maintain the horizontal stability of the entire stamping die 107, so that the center of the bottom end of the stamping die 107 and the center of the template frame 104 are aligned in the Y-axis position, so that during the stamping process, the stamping die at the bottom end of the stamping die 107 can stably enter the mold during operation to perform the stamping and molding process, avoiding the phenomenon of inaccurate position alignment of the stamping die and offset, thereby improving the quality and stability of the preparation process.

[0040] like Figures 1 to 8As shown, the jacking mold assembly 2 includes a closing mold 201, a parting line 202, a mold cavity 203, an expansion cone wall 204, a connecting pile 205, a jacking cone pile 206, a positioning outer rail 207, a positioning frame 208, a hydraulic cylinder 209 and an expansion frame 210, and the middle end of the closing mold 201 is provided with a parting line 202, the middle end of the parting line 202 is provided with a mold cavity 203, and the bottom end of the mold cavity 203 is provided with an expansion cone wall 204, the bottom end of the expansion cone wall 204 is provided with a connecting pile 205, and the top surface of the connecting pile 205 is fixed with a jacking cone pile 206, the outer walls on both sides of the parting line 202 are provided with positioning outer rails 207, and the positioning frames 208 are distributed at both ends of the closing mold 201, and the inner wall of one side of the positioning frame 208 is connected to the hydraulic cylinder 209, and one side of the hydraulic cylinder 209 is connected to the expansion frame 210;

[0041] In order to keep the closing module 201 stable in its structure during the closing and unfolding process, a sliding combination is adopted, such as Figures 1 to 8 As shown, the closed module 201 is divided into two groups by the parting line 202 at the middle end, and the mold cavity 203 at the middle end of the two groups of closed modules 201 is used to place the blank. The two groups of closed modules 201 rely on the positioning outer rails 207 on both sides of the parting line 202 to engage with the inner frame of the template frame 104. When the closed module 201 is extended and retracted through the hydraulic cylinders 209 at both ends, the positioning outer rails 207 that are in contact with the inner frame of the template frame 104 can be synchronized to slide, thereby improving the stability of the process of the closed module 201 internal expansion cone wall 204 cooperating with the connecting pile 205 to carry out the linkage lifting and removal of the blank, and reducing the shaking and deviation of the unfolding process;

[0042] In order to ensure that the finished blank can be smoothly removed from the mold without friction, Figures 1 to 8As shown, after the molding of the blank is completed, it can be ejected by the jacking cone pile 206 at the bottom end of the closing module 201, and the connecting pile 205 at the top is driven to rise by the reverse buffer mechanism 4, and the jacking cone pile 206 at the top of the connecting pile 205 cooperates with the jacking cone pile 206 to lift the corresponding expansion cone wall 204. Since the expansion cone wall 204 and the jacking cone pile 206 adopt a conical structure from top to bottom, when the jacking cone pile 206 is lifted, the expansion cone wall 204 will be pressed by the conical structure of the jacking cone pile 206, so that the entire expansion cone wall 204 and the closing module 201 are The inner wall mold of the closed module 201 is also separated synchronously after the expansion, loosening the fit to the outer wall around the blank, and the top surface of the lifting cone pile 206 and the bottom of the blank are in contact with each other on the basis of the original contact. As the expansion process progresses, the blank is removed from the mold without friction around it and the inner wall of the mold. The lifting cone pile 206 with a conical structure cooperates with the expansion cone wall 204 to allow the blank in the mold to be removed stably and without damage, thereby reducing the friction between the blank itself and the inner wall of the mold, improving the overall fastener processing quality, and reducing the loss of the mold itself.

[0043] like Figures 1 to 8 As shown, the molding module 3 includes a cavity frame 301, a buckle frame 302, a docking strip 303, a strip bolt 304, a top ring platform 305, an inner groove 306 and a protrusion 307, and the buckle frames 302 are distributed on both sides of the cavity frame 301, the middle ends of both sides of the cavity frame 301 are connected with the docking strip 303, and the strip bolts 304 are distributed around the docking strip 303, the top of the cavity frame 301 is provided with a top ring platform 305, the inner grooves 306 are distributed on both sides of the middle end of the cavity frame 301, and the inner grooves 306 are equidistantly arranged with protrusions 307 in the Y-axis direction;

[0044] In order to improve the adaptability during the processing of fastener blanks of different specifications, a replaceable mold cavity frame 301 is used, such as Figures 1 to 8As shown, the buckle frame 302 and the docking strips 303 are symmetrically distributed along the two sides of the mold cavity frame 301, and the mold cavity frame 301 forms a detachable structure with the ejection mold assembly 2 through the docking strips 303 and the strip bolts 304. This mold cavity frame 301 is placed on the inner walls of the mold cavity 203 on both sides of the closed module 201, and the distributed buckle frames 302 on both sides of the mold cavity frame 301 are buckled with the inner wall of the center of the closed module 201, thereby forming the mold center, and then the strip bolts 304 distributed by the docking strips 303 are tightened to allow the entire mold cavity frame 301 to be in the closed module 201. The wall remains stable, and an inner cavity structure can be formed by combining two sets of cavity frames 301, and the blank is placed in the cavity for molding. The cavity frame 301 not only maintains docking stability through the combination of inner groove 306 and protrusion 307 during the closing process, but also can be replaced through the disassembly structure of the cavity frame 301 itself when dealing with fastener blanks of different specifications, thereby improving adaptability on the basis of the original blank molding. This makes the mold not only widely applicable to fastener molding, but also can be taken out, replaced or repaired when worn out over a long period of time, saving materials.

[0045] like Figure 7 As shown, the reverse buffer mechanism 4 includes a lifting cylinder 401, a lifting rod 402, a linkage rod 403, a pressure sensor 404 and a damping rod 405, and the lifting rod 402 is arranged at the top of the lifting cylinder 401, the linkage rods 403 are distributed on both sides of the lifting rod 402, and the pressure sensor 404 is arranged on the top surface of one end of the linkage rod 403, and the damping rod 405 is connected to the top of the pressure sensor 404;

[0046] Finally, in order to maintain the stability of the force during the lifting process and the smoothness of the lifting process, the reverse buffering method is used to reduce the impact of the lifting force, such as Figure 7 As shown, the two ends of the jacking rod 402 are connected with the pressure sensor 404 and the damping rod 405 through the linkage rod 403. When the jacking cylinder 401 drives the jacking rod 402 and the connecting pile 205 to perform jacking, the linkage rods 403 at both ends of the jacking rod 402 can buffer the upward jacking force of the jacking cylinder 401 through the connected damping rod 405, reduce the inertia of the jacking force, and thus maintain the stability of the jacking process. The spoke-type pressure sensor 404 is connected to the bottom ends of the two groups of damping rods 405, which can facilitate the user to observe the force condition of the damping rod 405 during the jacking process during the caching and jacking force process, which is convenient for subsequent debugging.

[0047] In summary, the specific steps of the mold in preparing fasteners include the following:

[0048] S1. Module assembly: Assemble the main mold frame 101 with the template frame 104, and engage the piles 105 at the bottom of the template frame 104 and the surrounding pallets 106 with the middle position of the cold molding table 102 of the main mold frame 101, and then make sure that the support rods 109 around the cold molding table 102 are stably placed and uniform in size, and assemble the stamping module 107 with the bottom of the top frame 108, while keeping the center of the stamping die at the bottom of the stamping module 107 aligned with the center of the closed module 201 below;

[0049] S2. Blank insertion: After the overall mold structure is assembled, the closing mold 201 is expanded toward both ends at the center of the pile 105 through the hydraulic cylinders 209 connected at both ends. Then the user inserts the corresponding fastener blank into the mold cavity 203 so that the bottom end of the blank fits with the top of the jacking cone pile 206 and is placed stably. Then the hydraulic cylinder 209 is opened to reclose the closing mold 201 to keep the internal blank fit and placed;

[0050] S3 blank molding: After the blank is placed, the stamping die at the bottom of the stamping die 107 is pressed downward, so that the inner wall of the mold cavity frame 301 around the blank and the center of the mold is instantly completed by cold pressing molding;

[0051] S4. Mold expansion: After the molding of the blank is completed, the top connection pile 205 is driven to rise by the lifting cylinder 401, and then the lifting cone pile 206 at the top of the connecting pile 205 lifts the expansion cone wall 204 opened at the bottom of the closing module 201, so that the entire expansion cone wall 204 and the middle end of the closing module 201 are synchronously expanded, and at the same time, the inner walls of the two sets of mold cavity frames 301 in the closing module 201 are loosened to fit the outer walls around the blank after molding;

[0052] S5. Ejection of blank: As the two groups of cavity frames 301 unfold, the lifting cone piles 206 at the bottom continue to lift synchronously, forming an expanding and lifting state, so that the blank and the inner wall of the mold rise without friction. Then the lifting cone piles 206 rise to the center height of the closed mold 201. The user takes out the finished blank and puts in a new blank to continue the molding preparation, and repeats this process.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mold for preparing a fastener, characterized in that: include: Stamping die set (1); A lifting mold assembly (2) is arranged on the punching die set (1), the lifting mold assembly (2) comprising a closing die (201) and a parting line (202), the parting line (202) being arranged on the closing die (201), the closing die (201) being symmetrically divided along both sides of the parting line (202), and the closing die (201) forming a telescopic structure with the punching die set (1) via a hydraulic cylinder (209) and a positioning frame (208); A molding module (3) is arranged in the inner cavity of the ejection mold assembly (2); A reverse buffer mechanism (4) is arranged at the bottom end of the ejection mold assembly (2); The ejection mold assembly (2) further comprises: A mold cavity (203) is disposed in the middle of the parting line (202); An expansion cone wall (204) is provided at the bottom end of the mold cavity (203); A connecting pile (205) is arranged at the bottom end of the expansion cone wall (204); A jacking cone pile (206) is arranged on the top surface of the connecting pile (205); Positioning outer rails (207) are arranged on the outer walls on both sides of the parting line (202); Positioning frames (208) are arranged at both ends of the closing module (201); A hydraulic cylinder (209) connected to an inner wall of one side of the positioning frame (208); An expansion frame (210) connected to one side of the hydraulic cylinder (209); The bottom end of the mold cavity (203) and the expansion cone wall (204) are integrally formed, and the jacking cone pile (206) is in contact with the inner wall of the bottom end of the expansion cone wall (204); The shaping module (3) comprises: A mold cavity frame (301), wherein inner grooves (306) are distributed on both sides of the middle end of the mold cavity frame (301), and the inner grooves (306) are provided with convex blocks (307) arranged equidistantly in the Y-axis direction; The buckle frame (302) is arranged on both sides of the mold cavity frame (301), the middle ends of both sides of the mold cavity frame (301) are connected with docking strips (303), and the four sides of the docking strips (303) are respectively provided with strip bolts (304); A top ring platform (305) is arranged at the top of the mold cavity frame (301); The buckle frame (302) and the docking strips (303) are symmetrically distributed along the two sides of the mold cavity frame (301), and the mold cavity frame (301) forms a detachable structure with the ejection mold assembly (2) through the docking strips (303) and the strip bolts (304).

2. The mold for preparing a fastener according to claim 1, characterized in that: The stamping die set (1) comprises: Main mold frame (101); A cold molding table (102) is arranged on the middle top surface of the main mold frame (101), and blank grooves (103) are provided on both sides of the top surface of the cold molding table (102); A template frame (104) is arranged in the middle of the cold molding table (102), and a frame pile (105) is arranged at the bottom end of the template frame (104); A clamping plate (106) is arranged on the outer walls around the pile (105); A stamping die (107) is arranged at the center top of the template frame (104); A top frame (108) connected to the top end of the stamping die (107); The support rods (109) are distributed around the top frame (108).

3. The mold for preparing a fastener according to claim 2, characterized in that: The middle of the bottom end of the punching die (107) and the middle of the top surface of the template frame (104) are symmetrical along the Y axis.

4. The mold for preparing a fastener according to claim 1, characterized in that: The reverse buffer mechanism (4) comprises: Lifting cylinder (401); A lifting rod (402) is arranged at the top end of the lifting cylinder (401), linkage rods (403) are distributed on both sides of the lifting rod (402), and a pressure sensor (404) is arranged on the top surface of one end of the linkage rod (403); The damping rod (405) is connected to the top end of the pressure sensor (404).

5. The mold for preparing a fastener according to claim 4, characterized in that: The linkage platform rod (403) forms a lifting structure through the lifting rod (402) and the lifting cylinder (401), and the two ends of the damping rod (405) are connected to the pressure sensor (404) and the lifting and ejecting mold assembly (2).

6. A method for preparing a fastener, characterized in that: The method is applied to a mold for preparing a fastener according to any one of claims 1 to 5, comprising the following steps: The main mold frame (101) is combined with the template frame (104), and is engaged with the middle position of the cold molding table (102), so that the center of the bottom stamping die of the stamping die (107) is aligned with the center of the lower closing die (201); The closing mold (201) is expanded toward both ends at the center of the pile (105), and the corresponding fastener blank is put into the mold cavity (203), so that the closing mold (201) is closed again; The punching die at the bottom of the punching die (107) punches downward, so that the inner wall of the mold cavity frame (301) around the blank and the center of the mold are instantly cold-pressed and molded; The connecting pile (205) connected at the top is driven to rise by the lifting cylinder (401), so that the entire expansion cone wall (204) and the middle end of the closing module (201) are synchronously expanded, and the inner walls of the two groups of cavity frames (301) in the closing module (201) are loosened to fit the outer walls around the blank after molding; The jacking cone pile (206) at the bottom is synchronously jacked up so that the blank is lifted up around the inner wall of the mold without friction. When the jacking cone pile (206) rises to the center height of the closed mold (201), the blank that has been molded is taken out.

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