High-precision thread double-end screw production device

Abstract

The invention discloses a high-precision thread double-end screw production device, and relates to the technical field of double-end screw production, the high-precision thread double-end screw production device comprises a thread rolling table, the top of the thread rolling table is slidably connected with a sleeve rod, the top of the sleeve rod is fixedly provided with a movable table through welding, and the top of the movable table is fixedly provided with a lower twisting plate through a bolt; according to the automatic feeding device, the independent driving source is arranged to control the upper and lower washboards to move, meanwhile, automatic feeding work of matched double-end screw blanks is completed, manual discharging is not needed, the labor cost is reduced, meanwhile, the production continuity and stability are improved, the transmission assembly drives the first rotary disc and the second rotary disc to rotate, the movable table connected with the sleeve rod is controlled to move, and the production efficiency is improved. Meanwhile, the positions of the twisting plates connected to the surface of the movable table through the rotating arm are adjusted and controlled, along with movement of the movable table and the external expansion plate, position control over the lifting plate in the transmission table, movement of the blank to be subjected to thread rolling to the gap between the upper twisting plate and the lower twisting plate and movable blank thread rolling operation are indirectly achieved, and the automation level is high.

Description

Technical Field

[0001] The present invention relates to the technical field of double-headed screw production, and particularly to a production device for high-precision thread double-headed screws. Background Technique

[0002] In the field of fastener manufacturing, due to the special structural requirements of double-headed screws, that is, threads need to be formed at both ends, and the coaxiality of the threads at both ends is required to be extremely high, production challenges are faced. Traditional production methods mostly use single-station double thread rolling, that is, first form a thread at one end, and then transfer it to the other end for thread processing. This method not only has low efficiency, but also due to the possible deviation caused by two-positioning, it is difficult to meet the high-precision requirements of coaxiality, increasing the risk of assembly failure;

[0003] In addition, some production equipment that attempts to use double-station one-time forming often has insufficient automation and relies on manual feeding, which not only increases labor costs but also is difficult to ensure the continuity and stability of production. According to the invention patent "Feeding device for double-headed stud thread rolling" with the publication number CN117840358A, it is mentioned that currently, common thread rolling machines or thread lathes are used for surface thread forming processing of double-headed studs. The processing principle of the thread rolling machine is to form thread grooves by cold pressing. Compared with the thread lathe, not only is the processing efficiency high, but also the thread quality of the finished stud formed by extrusion is higher. In some small processing workshops, it is necessary to manually add the double-headed studs after turning into the thread rolling channel of the thread rolling machine, and the thread rolling channel moves in a reciprocating cold pressing manner. When adding double-headed studs, the hands are too close to the thread rolling channel, posing a certain safety hazard;

[0004] Therefore, a feeding mechanism is set up for automatic blanking of double-headed screw blanks. However, considering that it cannot be guaranteed whether the blank can maintain a vertical state after leaving the push plate and before contacting the thread rolling support plate. Compared with single-side thread rolling screws, the head can be used for limit locking to always maintain vertical movement, and the lack of limit affects the overall thread rolling accuracy of the blank;

[0005] Therefore, we propose a production device for high-precision thread double-headed screws. Summary of the Invention

[0006] The purpose of the present invention is to provide a production device for high-precision thread double-headed screws to solve the problems of insufficient automation in double-headed screw production, relying on manual feeding, which not only increases labor costs but also is difficult to ensure the continuity and stability of production mentioned in the above background technique, and at the same time consider the problem of reduced overall thread rolling accuracy due to the lack of limit during synchronous thread rolling on both sides of the double-headed screw;

[0007] To achieve the above object, the present invention provides the following technical solution: A high-precision thread double-headed screw production device, including a thread rolling table, on the top of which a sleeve rod is slidably connected. The top of the sleeve rod is fixedly welded with a movable table, and the bottom of the movable table is fixedly bolted with a lower thread rolling plate;

[0008] On the movable table, an upper thread rolling plate is slidably connected. A slider is slidably connected to the central channel at the bottom of the upper thread rolling plate. On the thread rolling table and at the bottom of the movable table, a transmission feeding mechanism is installed. A receiving rack is installed on the side of the transmission feeding mechanism. The transmission feeding mechanism includes a transmission table, a flow channel, and a lifting plate. The transmission table is installed on the top of the thread rolling table. A flow channel is opened in the transmission table, and a lifting plate is slidably connected in the flow channel. One side of the flow channel is communicated with the through hole at the bottom of the receiving rack.

[0009] Furthermore, the transmission feeding mechanism further includes a transmission tooth column and an outer expansion plate. The outer wall of the transmission table is slidably connected with the outer expansion plate. The transmission tooth column is movably connected in the transmission table. The tooth pattern on the side wall of the lifting plate is meshed and connected with the transmission tooth column. The tooth pattern on one side of the outer expansion plate is meshed and connected with the other side of the transmission tooth column. The bottom of the outer expansion plate is fixed to the sleeve rod.

[0010] Furthermore, one side of the transmission table extends into the upper channel of the movable table and is slidably connected with the movable table. The top of the lifting plate is provided with a groove. The receiving rack is divided into two layers. The bottom is used for storing the raw materials of the thread double-headed screw, and the top is used for receiving the cost of the thread double-headed screw.

[0011] Furthermore, a transmission component is fixedly bolted on the thread rolling table. A turntable one is sleeved and fixed on the output end of the transmission component, and the end of the output end of the transmission component is fixedly connected with a turntable two.

[0012] Furthermore, the outer wall of the turntable one abuts against the inner wall of the sleeve rod. A rotating arm is movably connected on the thread rolling table. One side of the end of the turntable two is rotatably connected with the rotating arm, and the end of the rotating arm is movably connected with the side wall of the upper thread rolling plate.

[0013] Furthermore, telescopic rods are symmetrically installed on the top of the thread rolling table, and one end of the telescopic rods is fixed to the bottom of the movable table.

[0014] The production method of the high-precision thread double-headed screw production device is as follows:

[0015] Self-feeding anti-blocking pushing: The sleeve rod moves on the surface of the thread rolling table by relying on the rotation of the turntable one. The outer expansion plate contacts the transmission tooth column during the rising process of the sleeve rod, causing the lifting plate located in the flow channel on the other side to descend, gradually contacting the raw materials of the thread double-headed screw piled up and stored in the flow channel. After descending to the lowest point, the acquisition of a single raw material of the thread double-headed screw is completed;

[0016] Anti-displacement wire rolling and discharging: The first turntable rotates continuously, causing the sleeve rod to descend. The connecting rod on the second turntable pushes the rotating arm to rotate, resulting in the movement of the upper wire rolling plate. The descent of the movable table and the outward expansion plate causes the lifting plate connected in mesh to rise, pushing up the raw material of the double-headed screw with threads, and contacting the moving upper wire rolling plate. With the cooperation of the slider for position limitation, the raw material of the double-headed screw with threads moves between the upper and lower wire rolling plates to form a shape, and then the formed double-headed screw with threads automatically falls onto the receiving rack.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. In the present invention, an independent drive source is set to control the movement of the upper and lower wire rolling plates, and at the same time, the automatic feeding of the supporting double-headed screw blanks is completed. There is no need for manual feeding, which reduces the labor cost. At the same time, the continuity and stability of production are improved. The first turntable and the second turntable are driven to rotate by the transmission component, controlling the movement of the movable table connected to the sleeve rod. At the same time, the position of the upper wire rolling plate connected to the rotating arm on the surface of the movable table is adjusted. Along with the movement of the movable table and the outward expansion plate, the position control of the lifting plate in the transmission table is indirectly realized, moving the wire rolling blank to the gap between the upper and lower wire rolling plates for the wire rolling operation of the movable blank, with a high level of automation;

[0019] 2. In the present invention, according to the thread settings at both ends of the double-headed screw, a supporting wire rolling mechanism is set. Compared with the vertical wire rolling method, the forming accuracy is high. Horizontal rolling wire rolling is adopted, and with the setting of the slider in the groove of the upper wire rolling plate, the rolling position of the blank is limited during the movement. At the same time, baffles are installed on both sides of the wire rolling plate to further prevent the longitudinal deviation during the rolling of the blank. The blank is driven to perform rolling wire rolling in a semi-surrounding structure, with high wire rolling accuracy, ensuring the coaxiality requirement of the threads at both ends of the double-headed screw and improving the product quality. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the high-precision double-headed screw production device with threaded teeth of the present invention;

[0021] Figure 2 It is a schematic diagram of the sectional structure of the high-precision double-headed screw production device of the present invention;

[0022] Figure 3 It is a schematic diagram of the installation of the receiving rack and the transmission feeding mechanism at the top of the wire rolling table of the present invention;

[0023] Figure 4 It is a schematic diagram of the installation of the transmission component on the high-precision double-headed screw production device of the present invention;

[0024] Figure 5 It is a schematic diagram of the front view structure of the high-precision double-headed screw production device of the present invention;

[0025] Figure 6Schematic diagram of the main view cross-section structure of the high-precision thread double-headed screw production device of the present invention;

[0026] Figure 7 Schematic diagram of the slider installation structure between the upper rubbing plate and the lower rubbing plate of the present invention.

[0027] In the figure: 1, thread rolling table; 2, transmission assembly; 3, receiving rack; 4, transmission feeding mechanism; 401, transmission table; 402, runner; 403, lifting plate; 404, transmission tooth column; 405, outward expansion plate; 5, turntable one; 6, turntable two; 7, rotating arm; 8, upper rubbing plate; 9, sleeve rod; 10, movable table; 11, lower rubbing plate; 12, slider; 13, telescopic rod. Specific implementation mode

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figure 1-7 , the present invention provides a technical solution:

[0030] Embodiment 1: Threads need to be formed at both ends of the same blank for the double-headed screw, and the coaxiality of the threads at both ends needs to be ≤0.05 mm to avoid assembly failure caused by positioning deviation. Single-station double thread rolling or double-station one-time forming can be used. To improve the blank forming rate, as Figure 1 shown, double-station one-time forming is adopted, and an automatic feeding component is equipped at the same time, without manual participation in feeding, with high automation;

[0031] When producing high-precision thread double-headed screws, the blanks are laid flat in the bottom gaps of the receiving rack 3. As Figure 2 shown, the receiving rack 3 is divided into two layers. The bottom layer is used for blank storage, and the top layer is used for picking up the formed double-headed screws. Feeding and discharging are located on the same side, which is convenient for raw material control and finished product monitoring. In case of an emergency, such as a large thread rolling error, subsequent blanks can be stopped from continuous processing in time;

[0032] A transmission feeding mechanism 4 is also installed on the top of the thread rolling table 1. The transmission table 401 in this mechanism is clamped with the movable table 10 on the thread rolling table 1, that is, one side of the transmission table 401 is clamped with the through groove on the movable table 10. As Figure 3As shown in the figure, when the subsequent movable table 10 moves, it is convenient to obtain the blanks discharged from the top of the transmission table 401. A flow channel 402 is arranged in the transmission table 401, and one side of the flow channel 402 is communicated with the blank discharging position of the receiving rack 3, so that the arranged blanks continuously enter the interior of the transmission table 401 along the flow channel 402;

[0033] The flow channel 402 is in a "U" shape, one side is communicated with the receiving rack 3, and the other side contacts the movable table 10. A lifting plate 403 is slidably connected in the flow channel 402 on the side of the movable table 10. As Figure 2 shown, a transmission tooth column 404 is movably connected in the transmission table 401. The side of the transmission tooth column 404 is meshed and connected with the lifting plate 403. An outward expanding plate 405 sliding on the outer wall of the transmission table 401 is also meshed and connected with the transmission tooth column 404. The outward expanding plate 405 and the lifting plate 403 are symmetrically centered on the transmission tooth column 404, that is, when the outward expanding plate 405 rises, the lifting plate 403 descends. By using the staggered distribution of the two plate members, the bottom of the outward expanding plate 405 is fixed to the sleeve rod 9. As Figure 5 shown, the sleeve rod 9 is located on the thread rolling table 1 and is connected to the movable table 10 at the top. The movement of the sleeve rod 9 synchronously drives the outward expanding plate 405 and the movable table 10 to move;

[0034] As Figure 6 shown, a turntable two 6 is fixed at the end of the transmission component 2 installed on the side of the thread rolling table 1. At the same time, a turntable one 5 is also sleeved and fixed on the output shaft. The turntable one 5 abuts against the sleeve rod 9. The end of the turntable two 6 is rotationally connected to the rotating arm 7 through a connecting rod, and the connecting rod at the end of the rotating arm 7 is rotationally connected to the upper rubbing plate 8 installed on the movable table 10. In order to Figure 6 take an example, when the entire turntable one 5 rotates counterclockwise, it drives the entire sleeve rod 9 to move downward on the surface of the thread rolling table 1. At the same time, the connecting rod on the turntable two 6 pushes the rotating arm 7 to rotate to the left, resulting in the upper rubbing plate 8 installed at the end of the connecting rod at the other end of the rotating arm 7 starting to move to the right on the movable table 10. The outward expanding plate 405 driven by the downward movement of the sleeve rod 9 moves synchronously, causing the lifting plate 403 located in the flow channel 402 on the side of the transmission tooth column 404 to move upward, thereby pushing the blanks discharged into the flow channel 402 towards the top of the movable table 10;

[0035] It can be understood that the downward movement of the sleeve rod 9 and the upward movement of the lifting plate 403 pushed by the outward expanding plate 405, that is, when the lifting plate 403 is stationary and the movable table 10 moves downward, the end blanks can be moved to the top of the movable table 10. Now, with the upward pushing action of the outward expanding plate 405, the blanks on the lifting plate 403 move upward at a double pitch. At this time, the upper rubbing plate 8 on the top of the movable table 10 moves to the right and gradually contacts the blanks in the groove on the top of the lifting plate 403, pushes them out of the groove and contacts the lower rubbing plate 11 on the side of the movable table 10, and is formed under the combined extrusion of the upper rubbing plate 8 and the lower rubbing plate 11;

[0036] By analyzing the movement trajectories of turntable 1 (5) and turntable 2 (6), it can be learned that turntable 1 (5) rotating 90 degrees counterclockwise drives the sleeve rod 9 to move downward. Turntable 2 (6) rotates to move the upper rubbing plate 8 to the right. When turntable 1 (5) continues to rotate 90 degrees, it starts to push the entire sleeve rod 9 upward, and turntable 2 (6) continuously pushes the entire upper rubbing plate 8 to move to the right. This is the moment when the blank is fully thread-rolled. Since the entire sleeve rod 9 and the outward expansion plate 405 rise, the lifting plate 403 at the end of feeding continuously descends in the runner 402 at this time, that is, it moves downward after the feeding ends, and starts to obtain a new round of blanks;

[0037] When turntable 1 (5) rotates 180 degrees, subsequent rotation will cause the rotating arm 7 connected to turntable 2 (6) to start pulling the upper rubbing plate 8 to reset to the left. At the same time, the entire turntable 1 (5) drives the movable table 10 connected to the entire sleeve rod 9 to move to the highest point. At this time, it is the lowest point of the movement of the lifting plate 403. The groove on the lifting plate 403 contacts the bottom of the runner 402, and the blank stored in the runner 402 automatically rolls onto the lifting plate 403. Along with the subsequent 180-degree rotation and reset, the upper rubbing plate 8 moves to the farthest position to the left at this time. When turntable 1 (5) rotates again, it starts to contact the blank stored on the lifting plate 403 on the right again, and continuously completes the blank thread-rolling work;

[0038] Through the rotation of turntable 1 (5) and turntable 2 (6), the combined activities of the movable table 10, the upper rubbing plate 8, and the lifting plate 403 are realized, and the blank of the double-headed screw is thread-rolled at high speed while automatically feeding. Compared with manual feeding, the forming efficiency of the double-headed screw is high.

[0039] Embodiment 2: To further improve the thread-rolling accuracy of the double-headed screw, as Figure 7 shown, a square slider 12 is slidably connected in the bottom channel of the upper rubbing plate 8. Since the double-headed screw is a fastener with threads at both ends, the rubbing plate positions are correspondingly distributed at both ends of the blank to prevent the double-headed screw from being misaligned during the lateral movement, resulting in the deviation of the thread-rolling position and the decrease in accuracy;

[0040] When the upper rubbing plate 8 moves to the right to contact the blank and pushes the blank to move, the slider 12 performs lateral limit on the blank and moves synchronously with the blank, preventing the blank from laterally deviating. At the same time, along with the end of the limit of the slider 12, due to the design of the inclined channel in the upper rubbing plate 8, the slider 12 automatically resets after moving a certain distance without the blank blocking. By installing stoppers at both ends of the blank on the movable table 10 to perform longitudinal limit on the movement of the blank, the thread-rolling accuracy of the double-headed screw is further improved;

[0041] Considering that the cross-sectional radii of different double-headed screws are different, during specific thread-rolling, the upper rubbing plate 8 on the top of the movable table 10 and its own lower rubbing plate 11 can be replaced to realize the matching thread-rolling forming of double-headed screws of different sizes. The telescopic rod 13 installed at the bottom of the movable table 10 further improves the stability of the movable table 10 during thread-rolling.

[0042] The working principle of the present invention is as follows: the blanks are laid flat in the bottom gap of the receiving rack 3. The receiving rack 3 is divided into two layers, the bottom layer is used for storing the blanks, and the top layer is used for forming and receiving the stud screws. When the transmission feeding mechanism 4 is started, the arranged blanks enter the interior of the transmission platform 401 along the flow channel 402;

[0043] The lifting plate 403 in the flow channel 402 is lifted and pushed by the driving gear column 404 and the outer expansion plate 405. When the outer expansion plate 405 rises with the sleeve rod 9, it contacts and drives the driving gear column 404 to rotate, thereby driving the lifting plate 403 to descend, contact and pick up the blank in the flow channel 402. Subsequently, when the sleeve rod 9 descends, the outer expansion plate 405 descends together, and the movable table 10 and the upper wash plate 8 begin to prepare to receive the blank.

[0044] As the turntable 1 5 continues to rotate, the sleeve rod 9 descends and pushes the entire movable platform 10 to move downward. At the same time, the connecting rod on the turntable 2 6 pushes the rotating arm 7 to rotate, thereby driving the upper washboard 8 to move rightward on the movable platform 10. At this time, the blank on the lifting plate 403 is contacted and pushed by the upper washboard 8, gradually contacting and being squeezed with the lower washboard 11 to form a thread, and the slider 12 slides in the groove at the bottom of the upper washboard 8 to limit the blank laterally to prevent it from being misplaced. When the turntable 1 5 rotates a certain angle, the sleeve rod 9 starts to rise, and the turntable 2 6 continues to push the upper washboard 8 to It moves right until the blank is completely thread-rolled and formed. At this time, the formed stud screws automatically fall into the top layer of the receiving rack 3. Subsequently, the turntable 1 5 continues to rotate, driving the sleeve rod 9, the movable table 10 and the upper rubbing plate 8 to reset and prepare for the next round of production. During the whole process, the transmission feeding mechanism 4, turntable 1 5, turntable 2 6, movable table 10, the upper rubbing plate 8, the lower rubbing plate 11 and the lifting plate 403 and other components work together to realize the automatic feeding, lifting, pushing, thread rolling and forming of the blank and the cycle of finished product discharge, thereby completing the production of stud screws efficiently and with high precision.

[0045] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0046] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0047] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific implementation manners. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A high-precision thread double-head screw production device, comprising a thread rolling table (1), characterized in that: The top of the thread rolling table (1) is slidably connected to a sleeve rod (9), the top of the sleeve rod (9) is fixed with a movable table (10) by welding, and the top of the movable table (10) is fixed with a lower scrubbing plate (11) by bolts; An upper rubbing plate (8) is slidably connected to the movable platform (10), and a slider (12) is slidably connected to the central groove at the bottom of the upper rubbing plate (8). A transmission feeding mechanism (4) is installed on the thread rolling platform (1) and located at the bottom of the movable platform (10). A receiving frame (3) is installed on the side of the transmission feeding mechanism (4). The transmission feeding mechanism (4) comprises a transmission platform (401), a flow channel (402) and a lifting plate (403). A transmission platform (401) is installed on the top of the thread rolling platform (1), and a flow channel (402) is opened in the transmission platform (401). A lifting plate (403) is slidably connected in the flow channel (402), and one side of the flow channel (402) is connected to a through hole at the bottom of the receiving frame (3).

2. A high-precision thread stud screw production device according to claim 1, characterized in that: The transmission feeding mechanism (4) further comprises a transmission tooth column (404) and an external expansion plate (405); the external expansion plate (405) is slidably connected to the outer wall of the transmission platform (401); the transmission tooth column (404) is movably connected inside the transmission platform (401); the tooth pattern on the side wall of the lifting plate (403) is meshingly connected to the transmission tooth column (404); the tooth pattern on one side of the external expansion plate (405) is meshingly connected to the other side of the transmission tooth column (404); and the bottom of the external expansion plate (405) is fixed to the sleeve rod (9).

3. A high-precision thread double-head screw production device according to claim 2, characterized in that: One side of the transmission platform (401) extends into the groove on the movable platform (10) and is slidably connected to the movable platform (10). A groove is provided on the top of the lifting plate (403). The receiving frame (3) is divided into two layers, the bottom layer is used for storing raw materials of threaded stud screws, and the top layer is used for receiving the cost of threaded stud screws.

4. A high-precision thread double-head screw production device according to claim 3, characterized in that: A transmission assembly (2) is fixed to the thread rolling table (1) by means of bolts, a turntable 1 (5) is sleeved and fixed on the output end of the transmission assembly (2), and a turntable 2 (6) is fixedly connected to the end of the output end of the transmission assembly (2).

5. The high-precision thread double-head screw production device according to claim 4 is characterized in that: The outer wall of the turntable 1 (5) is in contact with the inner wall of the sleeve rod (9); a rotating arm (7) is movably connected to the thread rolling table (1); one side of the movable connecting rod at the end of the turntable 2 (6) is rotatably connected to the rotating arm (7); and the movable connecting rod at the end of the rotating arm (7) is movably connected to the side wall of the upper scrubbing plate (8).

6. A high-precision thread double-head screw production device according to claim 5, characterized in that: A telescopic rod (13) is symmetrically mounted on the top of the thread rolling table (1), and one end of the telescopic rod (13) is fixed to the bottom of the movable table (10).

7. A high-precision thread double-head screw production device according to claim 6, characterized in that: The production method of the high-precision thread double-head screw production device is as follows: Self-feeding anti-blocking material pushing: the sleeve rod (9) attached to the turntable (5) rotates and moves on the surface of the thread rolling table (1), and the outer expansion plate (405) contacts the transmission gear column (404) as the sleeve rod (9) rises, causing the lifting plate (403) on the other side located in the flow channel (402) to descend, gradually contacting the threaded stud screw raw materials accumulated and stored in the flow channel (402), and after descending to the lowest point, the single threaded stud screw raw materials are obtained; Anti-dislocation thread rolling material discharge: the turntable 1 (5) rotates continuously, causing the sleeve rod (9) to descend, and the upper connecting rod of the turntable 2 (6) pushes the rotating arm (7) to rotate, causing the upper rolling plate (8) to move, and the movable platform (10) and the outer expansion plate (405) to descend, so that the meshing lifting plate (403) rises, pushing the raw material with the threaded stud screw upward and contacting the upper rolling plate (8) during the movement, and cooperating with the slider (12) for limiting, so that the threaded stud screw raw material moves and is formed between the upper rolling plate (8) and the lower rolling plate (11), and then the formed threaded stud screw automatically falls into the receiving frame (3).

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