Preparation process of bolt

Abstract

The bolt preparation technology comprises the following steps that S1, a bolt blank is fed into a mold cavity through a feeding port of equipment; s2, the mold is driven by a traction device, so that the mold does annular motion in the mold track; s3, when the mold moves to different upsetting points of the mold track, upsetting is conducted on the bolt blank through an upsetting assembly; and S4, the upset and formed bolt is sent out through a discharging port of the equipment. The feeding port, the discharging port and the upsetting position are concentrated on the same straight line, the upsetting stroke is short, and maintenance is convenient; the upsetting part is closed, and the main die and the auxiliary die are communicated with each other, so that the bolt blank is prevented from shifting during upsetting, and upsetting failure is prevented; the mold is always positioned in the annular track; a limiting device is arranged in the annular rail, the moving speed of the die is limited, the die is in a transient stop state during upsetting, and safety is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bolts, in particular to a preparation process of a bolt. BACKGROUND

[0002] A bolt is a common mechanical part in life, which is a fastener composed of a head and a screw rod; although the bolt structure is simple, it plays an important role. At present, a cold header is commonly used to mass-produce bolts and nuts, which are fasteners; the cold header is generally designed with multiple molds, which can be used to upset different types of bolts; when the wire rod enters the cold header, it is first cut, and then the cut wire rod is conveyed to the upsetting position by the clamp; the mold is used to upset the blank to form a nut and a screw rod, different molds are selected to upset the required size, and a groove is upset on the nut, and finally it is conveyed to the outside of the cold header through the discharge port. The cold header combines multiple processes together, so that the production path is lengthened, and the machine body is large in size; if a fault occurs at a certain position, the whole machine cannot operate, and the maintenance time is long. SUMMARY

[0003] The purpose of the present application is to provide a preparation process of a bolt to solve the problems in the background.

[0004] To achieve the above purpose, the present application provides the following technical scheme: A preparation process of a bolt, comprising the following steps: S1, feeding the bolt blank into the mold cavity through the feeding port of the equipment; S2, driving the mold by the traction device to make the mold do circular motion in the mold track; S3, the mold is moved to different upsetting points in the mold track, and the upsetting assembly is used to upset the bolt blank; S4, the bolt formed by upsetting is sent out through the discharge port of the equipment.

[0005] Preferably, the mold is a pair of molds, including a main mold and an auxiliary mold; the main mold and the auxiliary mold are fixedly connected at the ends; the main mold is provided with a first cavity, and the auxiliary mold is provided with a second cavity; the diameter of the first cavity is greater than that of the second cavity; the bolt blank is pushed into the first cavity through the feeding port; the bolt blank is formed by the upsetting assembly in the first cavity and the second cavity.

[0006] Preferably, the mold track is a pair of closed ring-shaped slides, including a ring-shaped track and an auxiliary track; the auxiliary track is L-shaped in cross section, the horizontal part of the auxiliary track is located in the middle of the ring-shaped track, and the vertical part is fixedly connected to the outside of the ring-shaped track; the vertical part of the auxiliary track is provided with an upsetting hole for being penetrated by the upsetting assembly; the mold does repeated motion in the ring-shaped track.

[0007] Preferably, the upsetting assembly is located on both sides of the mold; the upsetting assembly comprises an upsetting rod and a punch upsetting rod; the upsetting rod comprises upsetting rod one, upsetting rod two and upsetting rod three; the upsetting rod one and the punch upsetting rod are located on one side of the mold, and the upsetting rod two and the upsetting rod three are located on the other side of the mold; the diameter of the upsetting rod is equal to that of the punch upsetting rod, and is greater than that of the upsetting rod two and the upsetting rod three; the diameter of the upsetting rod two is equal to that of the upsetting rod three; the length of the upsetting rod three is greater than that of the upsetting rod one, the upsetting rod two and the punch upsetting rod; The punch upsetting rod is a sleeve rod structure; it comprises a punch upsetting sleeve, a punch rod and a fixing rod; the punch upsetting sleeve is in sliding connection with the punch rod; the inside of the punch upsetting sleeve is provided with a fixing groove a; one end of the punch rod is flat, and the other end is cross-shaped; the punch rod is provided with a protruding ring b along the outer wall, which can slide in the fixing groove a; the fixing rod is inserted into the through hole provided on the surface of the protruding ring b, so as to prevent the punch rod from rotating during upsetting; the length of the punch rod is greater than that of the punch upsetting sleeve, and the protruding cross-shaped end of the punch rod is used to form a groove on the bolt blank.

[0008] Preferably, the upsetting rod one and the upsetting rod two on the opposite side are used to shape the bolt blank; the mold is moved to the middle of the positions where the upsetting rod one and the upsetting rod two are located; the upsetting rod one and the upsetting rod two enter the first chamber and the second chamber respectively; the upsetting rod two moves into the second chamber and leaves a space distance equal to the length of the screw rod in the second chamber; the upsetting rod one pushes the bolt blank from the first chamber into the second chamber in the first chamber until it reaches the end of the upsetting rod two; the bolt blank in the first chamber is a nut, and the bolt blank in the second chamber is a screw rod, and the upsetting is preliminarily completed; the upsetting rod one and the upsetting rod two are withdrawn from the first chamber and the second chamber; The mold is further moved to the middle of the punch upsetting rod and the upsetting rod three, and the punch upsetting rod and the upsetting rod three enter the first chamber and the second chamber respectively; the upsetting rod three abuts against the end of the screw rod, the punch rod extrudes the surface of the nut to form a groove, and the bolt is formed; the punch upsetting rod is pushed out of the first chamber, and the upsetting rod three is further pushed forward to push the formed bolt out of the first chamber to the discharge port and then pushed out along the original path.

[0009] Preferably, the traction device comprises a traction rod, a traction shaft and an extension part; one end of the traction rod is rotatably connected to one end of the traction shaft, and the other end is rotatably connected to the end of the mold; the other end of the traction shaft is rotatably connected with a rotating disc; the extension part is fixedly connected to the middle of the traction rod; the rotating disc can drive the traction shaft to move in a circular track, so that the traction rod and the extension part move along, thereby driving the mold to move along the annular track; when the traction shaft rotates to different positions along the circular track, the extension part stretches and contracts according to the different positions in the annular track, thereby moving the mold in the annular track.

[0010] Preferably, the main mold end is provided with a connecting ring; the connecting ring includes a pair of collars and a connecting rod, the connecting rod being fixedly connected to the outer wall of the pair of collars; the collars are rotatably connected to the end of the main mold to fix the distance between two adjacent molds and prevent the molds from colliding when they turn and slide on the circular track.

[0011] Preferably, the inner wall of the annular track is provided with multiple limiting devices, which are set at the positions where the mold passes through the inlet, outlet and the end of the molding component; when the mold touches the limiting device, the mold stops moving and performs the corresponding feeding, upsetting and unloading operations.

[0012] Preferably, the telescopic part includes telescopic rods and telescopic shafts; the telescopic rods and telescopic shafts are rotatably connected; the telescopic rods are fixedly connected to the end of the traction rod; there are no fewer than four telescopic rods and no fewer than four telescopic shafts.

[0013] Preferably, the feed inlet, the punch upsetting rod, and the discharge outlet are located on the same side to shorten the upsetting stroke.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention concentrates the feed inlet, discharge outlet, and upsetting point on a straight line, resulting in a short upsetting stroke and convenient maintenance; The upsetting section of this invention is closed, with the main mold and the auxiliary mold chambers connected to each other, to prevent the bolt blank from shifting during upsetting and to prevent upsetting failure. The mold of this invention is always within a circular track; the circular track is equipped with a limiting device, which not only limits the speed of mold movement, but also makes the mold temporarily stop during upsetting, thus making it safer. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall invention; Figure 2 This is a front view of a portion of the device structure of the present invention; Figure 3 This is a schematic diagram of the rear side of a portion of the device structure of the present invention; Figure 4 This is a cross-sectional view of the mold structure; Figure 5 This is a schematic diagram of the structure at the mold track. Figure 6 A schematic diagram of the upsetting process; Figure 7 Cross-sectional view of the punch upsetting rod structure; Figure 8 This is a schematic diagram of the structure of the traction device; Figure 9 This is a schematic diagram of the structure at the connecting ring. Figure 10 This is a schematic diagram of the expansion joint.

[0016] In the diagram: 1. Feed inlet; 2. Mold; 21. Main mold; 211. First chamber; 22. Secondary mold; 221. Second chamber; 23. Connecting ring; 231. Collar; 232. Connecting rod; 3. Mold track; 31. Circular track; 311. Limiting device; 32. Auxiliary track; 321. Upsetting hole; 4. Traction device; 41. Traction rod; 42. Traction shaft; 43. Telescopic part. 431. Telescopic rod; 432. Telescopic shaft; 5. Upsetting assembly; 51. Upsetting rod; 511. Upsetting rod one; 512. Upsetting rod two; 513. Upsetting rod three; 52. Punch upsetting rod; 521. Punch upsetting sleeve; 522. Punch rod; a. Fixing groove; b. Protruding ring; 6. Discharge port; 7. Drive device; 71. Steering device; 72. Linkage device; 73. Pushing device. Detailed Implementation

[0017] Example 1:

[0018] Please see Figures 1-10 The present invention provides a technical solution: A bolt manufacturing process includes the following steps: S1. The bolt blank is fed into the mold chamber 2 through the feed port 1 of the equipment, and the equipment is fixedly installed on the base; S2. The traction device 4 drives the mold 2, causing the mold 2 to make a circular motion within the mold track 3; the traction device 3 is connected to the drive device 7. S3. When the mold 2 moves to different upsetting points on the mold track 3, the bolt blank is upset by the upsetting component 5. S4. The upset bolts are sent out through the discharge port 6 of the equipment.

[0019] Specifically, mold 2 is a pair, including a main mold 21 and a secondary mold 22; the main mold 21 and the secondary mold 22 are fixedly connected at their ends; the main mold 21 is provided with a first chamber 211, and the secondary mold 22 is provided with a second chamber 221, the diameter of the first chamber 211 is larger than that of the second chamber 221; the bolt blank is pushed into the first chamber 221 through the feed port 1; the bolt blank is upset in the first chamber 211 and the second chamber 221 by the upsetting assembly 5.

[0020] Specifically, the mold track 3 is a pair of closed annular slides, including an annular track 31 and an auxiliary track 32. The auxiliary track 32 has an L-shaped cross-section. The horizontal part of the auxiliary track 32 is located in the middle of the annular track 31, and the vertical part is fixedly connected to the outside of the annular track 31. The vertical part of the auxiliary track 32 is provided with upsetting holes 321 for the upsetting components 5 to pass through. Since the auxiliary track 32 is located in the middle of the annular track 31, by opening upsetting holes 321 in the vertical part of the auxiliary track 32, more upsetting components 5 can pass through, and more bolts of the structure can be upset in sequence. The mold 2 moves repeatedly along the inner wall of the annular track 31. The inner wall of the annular track 31 and the upper and lower horizontal surfaces of the auxiliary track 32 are polished smooth and can be appropriately coated with lubricating oil to reduce the resistance between the mold 2 and the mold track 3 and increase the service life.

[0021] Specifically, the upsetting assembly 5 is located on both sides of the mold 2; the upsetting assembly 5 includes an upsetting rod 51 and a punch upsetting rod 52; the upsetting rod 51 includes upsetting rod one 511, upsetting rod two 512 and upsetting rod three 513; upsetting rod one 511 and punch upsetting rod 52 are located on one side of the mold 2, and upsetting rod two 512 and upsetting rod three 513 are located on the other side of the mold 2; the diameter of upsetting rod one 511 is equal to that of punch upsetting rod 52 and greater than that of upsetting rod two 512 and upsetting rod three 513; the diameter of upsetting rod two 512 is equal to that of upsetting rod three 513; the length of upsetting rod three 513 is greater than that of upsetting rod one 511, upsetting rod two 512 and punch upsetting rod 52; The punch upsetting rod 52 is a sleeve structure, including a punch upsetting sleeve 521, a punch rod 522, and a fixing rod. The punch upsetting sleeve 521 and the punch rod 522 are slidably connected. The punch upsetting sleeve 521 has a fixing groove a inside. One end of the punch rod 522 is flat, and the other end is cross-shaped, or it can be replaced with other shapes. The punch rod 522 has a protruding ring b along its outer wall, which can slide in the fixing groove a. The fixing rod is inserted into a through hole on the surface of the protruding ring b to prevent the punch rod 522 from rotating during upsetting. The length of the punch rod 522 is greater than that of the punch upsetting sleeve 521, and the protruding cross-shaped end of the punch rod 522 is used to groove the bolt blank.

[0022] Specifically, upsetting rod 1 511 and upsetting rod 2 512 on the opposite side are used to upset and shape the bolt blank; the mold 2 moves from the discharge port 1 to the middle of the positions of upsetting rod 1 511 and upsetting rod 2 512; upsetting rod 1 511 and upsetting rod 2 512 enter the first chamber 211 and the second chamber 221 respectively, upsetting rod 2 512 moves into the second chamber 221, and reserves space in the second chamber 221 for the length of the bolt to be upset; upsetting rod 1 511 in the first... The bolt blank is pushed from the first chamber 211 into the second chamber 221 until it reaches the end of the upsetting rod 512. Since the width of the first chamber 211 is greater than that of the second chamber 221, the diameter of the bolt blank entering the second chamber 221 is reduced due to compression. This results in the bolt blank in the first chamber 211 being a nut and in the second chamber 221 being a screw, thus the initial upsetting is completed. The upsetting rod 511 and the upsetting rod 512 are then withdrawn from the first chamber 211 and the second chamber 221. The mold 2 moves further to the middle of the upsetting rod 52 and the third upsetting rod 513. The upsetting rod 52 and the third upsetting rod 513 enter the first chamber 211 and the second chamber 221 respectively. The third upsetting rod 513 abuts against the end of the screw. When the punch rod 522 extrudes a groove into the surface of the nut, the third upsetting rod 513 simultaneously forms a counterforce with the punch rod 522 to counteract the thrust of the punch rod 522, and the bolt is formed. The upsetting rod 52 is pushed out of the first chamber 211, and the third upsetting rod 513 is pushed forward further to push the formed bolt out of the first chamber 211 to the discharge port. The third upsetting rod 513 is pushed out along the original path.

[0023] Specifically, the traction device 4 includes a traction rod 41, a traction shaft 42, and a telescopic part 43; one end of the traction rod 41 is rotatably connected to one end of the traction shaft 42, and the other end is rotatably connected to the end of the mold 2; the other end of the traction shaft 42 is rotatably connected to a rotating disk; the telescopic part 43 is fixedly connected to the middle of the traction rod 41; the rotating disk can drive the traction shaft 42 to move in a circular trajectory, so that the traction rod 41 and the telescopic part 43 follow the movement, thereby driving the mold 2 to move along the annular track 31; as the traction shaft 42 rotates to different positions along the circular trajectory, the telescopic part 43 stretches and contracts accordingly according to the different positions in the annular track 31, thereby tractioning the mold 2 to move within the annular track 31; The drive device 7 includes a steering device 71, a linkage device 72, and a pushing device 73; the rotation device 71 converts forces from the same direction into different directions and transmits them to the linkage device 72 and the pushing device 73; one end of the linkage device 72 is rotatably connected to a rotating wheel, which is connected to a transmission belt. The transmission belt drives the rotating disk to rotate, and the rotating disk drives the traction device 4 to move. The traction device 4 drives the mold 2 to move within the circular track 31; the pushing device 73 pushes the end of the upsetting assembly 5 to perform the upsetting process. The base has an inverted T-shaped structure with a vertical circular groove. The rotating disk has an outer disk and an inner disk, which are fixedly connected. The inner disk is embedded in the circular groove, making the circular groove an annular groove. The outer disk has a diameter larger than the circular groove, and one side of the outer disk is rotatably connected to the vertical side of the base. The length of the traction shaft 42 is greater than the thickness of the circular groove. The traction shaft 42 passes through the annular groove, with one end connected to the rotating disk for transmission and the other end rotatably connected to the end of the traction rod 41. Driven by the rotating disk, the rotating shaft 42 moves within the annular groove, forming a circular trajectory. Specifically, the main mold 21 is provided with a connecting ring 23 at its end; the connecting ring 23 includes a pair of collars 231 and a connecting rod 232, the connecting rod 232 is fixedly connected to the outer wall of the pair of collars 231; the collars 231 are rotatably connected to the end of the main mold 21 to fix the distance between two adjacent molds 2, so as to prevent the molds 2 from colliding when the annular track 31 turns and slides. By using the connecting ring 23 to fix the distance between two adjacent molds 2, the number of molds 2 in the annular track 31 can be increased.

[0024] Specifically, the inner wall of the annular track 31 is provided with multiple limiting devices 311, which are set at the positions where the mold 2 passes through the inlet 1, the outlet 5 and the end of the molding component 5; when the mold 2 touches the limiting device 311, the mold 2 stops moving and performs the corresponding feeding, upsetting and unloading operations; the limiting device 311 can also control the speed of the mold 2. When the speed is too fast, the limiting device 311 changes the moving speed of the mold 2; through cooperation with the connecting ring 23, collisions between the mold 2 and the connecting ring 23 are avoided.

[0025] Specifically, the telescopic part 43 includes a telescopic rod 431 and a telescopic shaft 432; the telescopic rod 431 and the telescopic shaft 432 are rotatably connected; the telescopic rod 431 is fixedly connected to the end of the traction rod 41; there are no fewer than four telescopic rods 431 and no fewer than four telescopic shafts 432, and the four telescopic rods 431 and the four telescopic shafts 432 form a telescopic rhombus; the second rhombus shares a telescopic shaft 432 with the first rhombus, that is, three telescopic shafts 432 and four telescopic rods 431 form the second rhombus, and so on, until the required number is reached; the more rhombuses there are, the greater the bending angle of the telescopic part 43, which helps to reduce the frictional resistance generated by the mold 2 when turning.

[0026] Specifically, the feed inlet 1, the punch upsetting rod 52, and the discharge outlet 6 are located on the same side, shortening the upsetting stroke. The discharge outlet 6 is located below the punch upsetting rod 52, so that the material can directly enter the discharge outlet after upsetting is completed, reducing the upsetting process.

[0027] Working principle: The main mold 21 and the auxiliary mold 22 are fixedly connected and placed in the annular track 31, with the end of the main mold 21 positioned at the feed port 1. If there is a pair of molds 2, a connecting ring 23 is rotatably connected between the pair of molds 2 to fix the distance between the two adjacent molds 2. If there are at least two pairs of molds 2, the distance between the molds 2 is controlled by the limiting device 311 and the connecting ring 23 to avoid collision. The cut bolt blank is fed into the first chamber 211 through the feed port 1; the rotating disk is driven by the drive device 7 to start rotating, which drives the traction shaft 42 to move in a circular trajectory. The traction shaft 42 drives the traction rod 41 to move in the annular track 31; the inner wall of the annular track 31 is provided with no less than three limiting devices 311, corresponding to the feed port, upsetting rod 1 511 and discharge port 6 on one side of the mold track 3, wherein the discharge port 6 is located on the upper side of the punch upsetting rod 52, and the upsetting rod 2 512 and upsetting rod 3 513 are respectively connected to the upsetting rod 1 511. Upsetting rod 511 and punch 52 are aligned and located on the other side of mold track 3. Mold 2 moves to upsetting rod 511 and stops. Drive device 7 pushes upsetting rod 511 and upsetting rod 512 from both sides of mold track 3 into the first chamber 211 and the second chamber 221. Upsetting rod 512 stops in the second chamber 512 at the space required for upsetting the bolt length. Upsetting rod 511 pushes the bolt blank from the first chamber 211 to the second chamber 221. Since the diameter of the first chamber 211 is larger than that of the second chamber 221, the bolt blank moves from the first chamber 211 to the second chamber 221. In chamber 221, the bolt blank entering the second chamber 221 becomes thinner, becoming a screw, while the bolt blank in the first chamber 211 becomes a nut. Then, upsetting rod one 511 and upsetting rod two 512 exit the chambers, and the mold 2 continues to move until it stops at the punch upsetting rod 52. The punch upsetting rod 52 and the opposite upsetting rod three 513 begin to enter the first chamber 211 and the second chamber 221 respectively. Upsetting rod three 513 abuts against the end of the screw, and while the punch rod 522 is pressing a groove into the nut surface, upsetting rod three 513 simultaneously engages with the punch... The rod 522 forms a counterforce to counteract the thrust of the punch rod 522, thus forming the bolt. The punch upsetting rod 52 exits the first chamber 211, and the upsetting rod 513 continues to push forward, pushing the bolt out of the first chamber 211. The bolt then falls into the discharge port 6 below, completing the upsetting process. The length of the upsetting rod 513 is not less than the length of the mold 2, allowing it to push the bolt out of the chamber. The punch upsetting rod 52 is a sleeve structure, with the end of the internal punch rod 522 being cross-shaped or other shapes, used to groove the surface of the nut.

[0028] Mold 2 continues to move, having moved from one end of the circular track 31 to the other, and begins to turn at the circular point. During the turn, the telescopic part 43 begins to bend, and the angle between its telescopic rod 431 and the traction rod 41 begins to change. It gradually changes from a stretched state during planar movement to a contracted state until the turn of mold 2 is complete. The telescopic part 43 then gradually changes from a contracted state to a stretched state, and mold 2 continues to move until it reaches the upper side of the initial position of the feed inlet 1 and begins to turn again. At this time, the telescopic part gradually changes from a stretched state to a contracted state until the turn is complete. Mold 2 continues to move to the feed inlet 2, triggering the limiting device 311, and the feed inlet 1 begins to feed material, and the above movement is repeated. If a pair of molds 2 move within the circular track 31, the connecting ring 23 always fixes the distance between adjacent main molds 21, and collisions can be avoided even when the turning force direction is inconsistent or uneven. Within the mold track 3, only one mold is needed. The upsetting process can be carried out with mold 2; with the addition of connecting ring 23, mold 2 can be used for upsetting in pairs, solving the problem of uneven movement speed between a pair of adjacent molds 2; with the addition of upper limit device 311, the problem of displacement between upsetting component 5 and mold 2 during upsetting is avoided, and the movement speed of mold 2 is limited, avoiding the problem of collision between adjacent molds 2 between a pair of connecting rings 23; if the mold track 3 is large enough, and the positions between the upper limit devices 311 are reasonably set, and the traction component 13 is added, more than two pairs of molds 2 can be placed in the mold track 3, and more molds 2 can be placed, thereby increasing the production quantity; through the limiting and stopping function of the upper limit device 311, the distance between adjacent molds 2 between a pair of connecting rings 23 can be kept within a certain range. Once the distance range is exceeded, it will encounter the upper limit device 311, which will adjust the distance automatically to ensure that the mold 2 moves normally within the mold track 3.

[0029] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A process for the production of a bolt, characterized in that: The method comprises the following steps: S1, the bolt blank is sent into the mold (2) cavity through the feeding port (1) of the equipment; S2, the mold (2) is driven by the traction device (4) to make the mold (2) do circular motion in the mold track (3); S3, the mold (2) is moved to different upsetting points of the mold track (3), and the bolt blank is upset by the upsetting assembly (5); S4, the upset bolt is sent out through the discharge port (6) of the equipment.

2. The process for manufacturing a bolt according to claim 1, characterized in that: The mold (2) is a pair of molds, including a main mold (21) and a secondary mold (22); the end of the main mold (21) and the secondary mold (22) is fixedly connected; the first cavity (211) is arranged in the main mold (21), the second cavity (221) is arranged in the secondary mold (22), the diameter of the first cavity (211) is greater than that of the second cavity (221); the bolt blank is pushed to the first cavity (221) through the feeding port (1); the bolt blank is upset in the first cavity (211) and the second cavity (221) by the upsetting assembly (5).

3. The process for manufacturing a bolt according to claim 1, wherein: The mold track (3) is a pair of closed annular slides, including an annular track (31) and an auxiliary track (32); the cross section of the auxiliary track (32) is L-shaped, the horizontal part of the auxiliary track (32) is located in the middle of the annular track (31), and the vertical part is fixedly connected to the outside of the annular track (31); the vertical part of the auxiliary track (32) is provided with an upsetting hole (321) for being penetrated by the upsetting assembly (5); the mold (2) does repeated motion in the annular track (31).

4. The process for manufacturing a bolt according to claim 1, wherein: The upsetting assembly (5) is located on both sides of the mold (2); the upsetting assembly (5) comprises an upsetting rod (51) and a punch upsetting rod (52); the upsetting rod (51) comprises an upsetting rod one (511), an upsetting rod two (512) and an upsetting rod three (513); the upsetting rod one (511) and the punch upsetting rod (52) are located on one side of the mold (2), the upsetting rod two (512) and the upsetting rod three (513) are located on the other side of the mold (2); the diameter of the upsetting rod one (511) is equal to that of the punch upsetting rod (52), which is greater than that of the upsetting rod two (512) and the upsetting rod three (513); the diameter of the upsetting rod two (512) is equal to that of the upsetting rod three (513); the length of the upsetting rod three (513) is greater than that of the upsetting rod one (511), the upsetting rod two (512) and the punch upsetting rod (52). The punch upsetting rod (52) is a sleeve rod structure; comprising a punch upsetting tube sleeve (521), a punch rod (522) and a fixed rod; the punch upsetting tube sleeve (521) is slidably connected with the punch rod (522); the inside of the punch upsetting tube sleeve (521) is provided with a fixed groove (a); one end of the punch rod (522) is flat, and the other end is cross-shaped; the punch rod (522) is provided with a protruding ring (b) along the outer wall, which can slide in the fixed groove (a); the fixed rod is inserted into the through hole formed on the surface of the protruding ring (b) to prevent the punch rod (522) from rotating during upsetting; the length of the punch rod (522) is greater than that of the punch upsetting tube sleeve (521), and the protruding cross-shaped end of the punch rod (522) is used for forming grooves on the bolt blank.

5. A process for the production of a bolt according to claim 4, characterized in that: The upsetting rod one (511) and the upsetting rod two (512) on the opposite side are used for shaping the bolt blank; the mold (2) moves to the middle of the positions where the upsetting rod one (511) and the upsetting rod two (512) are located; the upsetting rod one (511) and the upsetting rod two (512) respectively enter the first chamber (211) and the second chamber (221), the upsetting rod two (512) moves to the second chamber (221), and a space distance of the length of the screw rod is reserved in the second chamber (221); the upsetting rod one (511) pushes the bolt blank from the first chamber (211) into the second chamber (221) in the first chamber (211), until the end of the upsetting rod two (512) is reached; the bolt blank is a nut in the first chamber (211), and a screw rod in the second chamber (221), and the upsetting is preliminarily completed; the upsetting rod one (511) and the upsetting rod two (512) are withdrawn from the first chamber (211) and the second chamber (221); The mold (2) is further moved to the middle of the punch upsetting rod (52) and the upsetting rod three (513), the punch upsetting rod (52) and the upsetting rod three (513) respectively enter the first chamber (211) and the second chamber (221); the upsetting rod three (513) abuts to the end of the screw rod, the punch rod (522) extrudes the nut surface into a groove, and the bolt is formed; the punch upsetting rod (52) is pushed out of the first chamber (211), the upsetting rod three (513) is further pushed forward to push the formed bolt out of the first chamber (211) to the discharge port, and the upsetting rod three (513) is pushed out along the original path.

6. The process for making a bolt according to claim 1, wherein: The traction device (4) comprises a traction rod (41), a traction shaft (42) and a telescopic part (43); one end of the traction rod (41) is rotatably connected to one end of the traction shaft (42), and the other end is rotatably connected to the end of the mold (2); the other end of the traction shaft (42) is rotatably connected with a rotating disc; the telescopic part (43) is fixedly connected to the middle of the traction rod (41); the rotating disc can drive the traction shaft (42) to move in a circular trajectory, so that the traction rod (41) and the telescopic part (43) move together, thereby driving the mold (2) to move along the annular track (31); when the traction shaft (42) rotates to different positions along the circular trajectory, the telescopic part (43) stretches and contracts according to different positions on the annular track (31), thereby moving the mold (2) in the annular track (31).

7. The process of claim 2, wherein: The end of the main mold (21) is provided with a connecting ring (23); the connecting ring (23) comprises a pair of sleeves (231) and a connecting rod (232), and the connecting rod (232) is fixedly connected to the outer walls of the pair of sleeves (231); the sleeves (231) are rotatably connected to the end of the main mold (21), so as to fix the distance between the adjacent two molds (2), and avoid collision when the mold (2) turns and slides on the annular track (31).

8. The process of claim 3, wherein: The inner wall of the annular track (31) is provided with a plurality of limiting devices (311) arranged at positions where the mold (2) passes through the feeding port (1), the discharging port (5) and the end of the shaping assembly (5); when the mold (2) touches the limiting device (311), the mold (2) stops moving, and corresponding feeding, upsetting and discharging operations are performed.

9. The process for making a bolt according to claim 6, wherein: The telescopic part (43) comprises telescopic rods (431) and telescopic shafts (432); the telescopic rods (421) and the telescopic shafts (432) are rotationally connected; the telescopic rods (431) are fixedly connected to the end of the traction rod (41); the telescopic rods (431) are not less than four, and the telescopic shafts (432) are not less than four.

10. The process for making a bolt according to claim 1, wherein: The feeding port (1), the punch upsetting rod (52) and the discharging port (6) are located on the same side, and the upsetting stroke is shortened.

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