Automatic die for extruding teeth inside and outside bolt thrust cap

Abstract

The invention relates to the technical field of tooth extruding dies, and discloses a bolt thrust cap internal and external tooth extruding automatic die which comprises an upper die, a lower die and a water supply part. The upper die is arranged above the lower die; a tapping punch is mounted at the bottom of the upper die, a loading groove is formed in the middle of the lower die, a circulating cylinder seat is mounted in the loading groove, and a thread forming part corresponding to the tapping punch is detachably mounted in the middle of the circulating cylinder seat. A circulating cavity is formed in the circulating cylinder seat, and the bottom of the circulating cylinder seat is connected with a drainage pipe. The internal thread and the external thread of the bolt thrust cap are machined at the same time through the one-time synchronous forming technology, efficiency is improved, sharp edges are avoided, meanwhile, a circulating cooling liquid system is adopted, inflow and outflow of cooling liquid are controlled through an elastic plugging piece, the temperature of the forming cylinder base is effectively reduced, the thread forming stability is guaranteed, and the mold structure is protected; the continuous cooling effect is ensured.

Description

Technical Field

[0001] This invention relates to the field of extrusion die technology, and in particular to an automatic extrusion die for the inner and outer teeth of a bolt thrust cap. Background Technology

[0002] Bolt thrust caps, also known as locking caps or anti-loosening caps, are an important functional structural design on bolts. Their core function is to limit the bolt's insertion depth and increase the contact area, dispersing pressure. This prevents the bolt from being excessively screwed into the threaded hole or process hole, ensuring a predetermined and precise distance between the bolt head and the surface of the connecting part. The increased base area also disperses the pressure of the bolt on the connecting part's surface, effectively preventing damage to softer materials (such as aluminum alloy shells) and improving connection stability. Machining bolt thrust caps requires a machining mold to create threads on both the inner and outer surfaces. The bolt thrust cap is fitted onto the bolt head, and the internal threads engage with the bolt head. Rotating the bolt thrust cap tightens the bolt. Once the bolt is screwed to a certain depth, it provides a stop. The bolt thrust cap also has a threaded rod section on the outside, which can be used to load other workpieces.

[0003] In the current bolt thrust cap manufacturing process, the processing of internal and external threads usually requires two steps. First, the thread rolling die is used to roll the thread on the shank of the bolt thrust cap to form the external thread. Then, the tapping die is used to tap the inner hole of the bolt thrust cap to produce the internal thread. This processing method cannot complete the processing of internal and external threads on a single die, which not only increases the complexity of the processing steps but also affects the production efficiency of bolt thrust caps.

[0004] To address the aforementioned issues, this application proposes an automatic die for extruding inner and outer threads of a bolt thrust cap. Summary of the Invention

[0005] This invention proposes an automatic die for extruding the inner and outer threads of a bolt thrust cap, which solves the problem in related technologies where the inner and outer threads of a bolt thrust cap need to be processed in two steps: first, the outer thread is processed using a thread rolling die, and then the inner thread is processed using a thread tapping die. This process cannot be completed simultaneously on a single die, resulting in complex procedures and reduced production efficiency.

[0006] This invention proposes an automatic die for extruding inner and outer threads of a bolt thrust cap, comprising an upper die, a lower die, and a water supply component;

[0007] The upper mold is positioned above the lower mold;

[0008] The bottom of the upper mold is equipped with a tapping punch, the middle of the lower mold is provided with a loading groove, and a circulation cylinder seat is installed in the loading groove. A thread forming part corresponding to the tapping punch is detachably installed in the middle of the circulation cylinder seat.

[0009] The circulation cylinder seat has a circulation chamber inside, the bottom of the circulation cylinder seat is connected to a drain pipe, the top of the drain pipe has an opening that communicates with the circulation chamber, the circulation cylinder seat is equipped with an elastic sealing member that matches the opening, and the water supply member is used to transport coolant to the circulation chamber.

[0010] When the mold is closed, the upper mold moves down and applies pressure to the elastic sealing component, causing it to deform and move down accordingly. The elastic sealing component seals the opening, and the water supply component delivers the coolant to the circulation chamber. When the mold is opened, the upper mold moves away from the lower mold, and the elastic sealing component returns to its original position under the action of elasticity and opens the opening. The coolant enters the drain pipe through the opening and then is discharged.

[0011] As a further optimization of the present invention, the thread forming part includes a forming cylinder seat, which is detachably installed in the middle of the circulating cylinder seat and located below the tapping punch. A forming cavity is provided inside the forming cylinder seat, and the inner wall of the forming cylinder seat is integrally formed with thread protrusions in a spiral structure. The outer circumference of the tapping punch is integrally formed with tapping threads in a spiral structure.

[0012] As a further optimization of the present invention, the outer periphery of both the tapping thread and the thread protrusion is arc-shaped, so that the inner and outer threads of the bolt thrust cap form a spiral arc structure.

[0013] As a further optimization of the present invention, a threaded groove is provided in the middle of the circulating cylinder seat, the forming cylinder seat is threadedly connected in the threaded groove, and the threaded groove in the middle of the circulating cylinder seat is not connected to the circulating cavity inside it.

[0014] As a further optimization of the present invention, the elastic sealing component includes a shaft, an elastic part and a sealing head. A vertically arranged shaft is installed in the circulation cavity of the circulation cylinder seat through the elastic part, and the top end of the shaft slides through the top of the circulation cylinder seat. A sealing head located above the drain pipe is installed at the bottom end of the shaft, and the sealing head corresponds to the opening.

[0015] As a further optimization of the present invention, the elastic part includes a spring and a loading shaft. The loading shaft is fixedly mounted on a shaft rod, and a spring sleeved on the shaft rod is fixed on the loading shaft. The top end of the spring is connected to the top wall inside the circulation cavity.

[0016] As a further optimization of the present invention, the water supply component includes a water pump and a water supply pipe. The bottom of the circulation cylinder seat is connected to a water supply pipe that communicates with the circulation chamber, and the end of the water supply pipe away from the circulation cylinder seat is connected to the water pump.

[0017] As a further optimization of the present invention, a liquid level sensor is installed in the circulation chamber, and a controller is installed on the outside of the lower mold, and the liquid level sensor and the water pump are both electrically connected to the controller.

[0018] The above-described technical solution of the present invention has the following beneficial technical effects:

[0019] 1. During processing, the blank is placed into the thread forming part in the lower die, and then the upper die moves down, driving the tapping punch to rotate. The tapping threads on the outer periphery of the tapping punch can tap and extrude threads into the inside of the blank. When the center of the blank is formed with threads, the blank can be rotated by the rotational force of the tapping punch. The thread protrusions on the inner wall of the forming cylinder form external threads on the outer periphery of the blank, so that the inner and outer threads of the bolt thrust cap can be formed simultaneously. Moreover, the outer periphery of the tapping thread and the thread protrusion are both arc-shaped, so that the threads formed inside and outside the bolt thrust cap are also arc-shaped with a spiral structure. The above design realizes the synchronous forming of the inner and outer threads of the bolt thrust cap in one step, reducing processing steps and improving production efficiency. At the same time, the arc-shaped thread design avoids sharp edges, which can prevent over-tightening during subsequent use and improve the controllability of product assembly.

[0020] 2. To reduce overheating of the inner wall of the forming cylinder during prolonged processing, when the upper mold moves downwards to close with the lower mold, the upper mold pushes the elastic sealing element downwards, causing it to seal the opening on the drain pipe. At this time, the water supply component introduces coolant into the circulation chamber within the circulating cylinder. The coolant absorbs the heat from the forming cylinder itself through the inner wall of the circulating cylinder, and this absorbed heat is then absorbed by the coolant, thus cooling the forming cylinder. After the bolt thrust cap is processed, the upper mold moves upwards, and the pressure on the elastic sealing element is released, allowing it to regenerate its elasticity. Under the action of returning to its original position, the opening on the drain pipe is immediately opened, and the coolant in the circulating cylinder seat can enter the drain pipe through the opening, and then be discharged to the collection system for collection. This ensures that there is fresh coolant flowing into the circulating cavity every time the bolt thrust cap is processed. The above-mentioned circulating coolant effectively controls the temperature rise of the forming cylinder seat during long-term processing, ensuring the stability of the thread forming. At the same time, the elastic sealing part buffers the impact of the upper mold moving downward when sealing the opening, protecting the mold structure. Moreover, the coolant is refreshed every time the processing is completed, ensuring the continuity of the cooling effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an automatic die for extruding inner and outer teeth of a bolt thrust cap proposed in this invention.

[0022] Figure 2 This is a schematic diagram of the mold-closing structure of the upper and lower molds of the present invention;

[0023] Figure 3 This is a schematic diagram of the mating structure between the circulating cylinder seat and the threaded forming part of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the elastic sealing component of the present invention;

[0025] Figure 5 For the present invention Figure 3 Enlarged view of A in the middle;

[0026] Figure 6 This is a schematic diagram of the tapping punch of the present invention.

[0027] Reference numerals: 1. Upper die; 101. Tapping punch; 1011. Tapping thread; 2. Lower die; 21. Controller; 3. Circulating cylinder seat; 301. Liquid level sensor; 31. Drain pipe; 311. Opening; 4. Thread forming part; 41. Forming cylinder seat; 42. Thread protrusion; 5. Elastic sealing part; 51. Shaft; 52. Elastic part; 521. Spring; 522. Loading shaft; 53. Sealing head; 6. Water supply part; 61. Water pump; 62. Water supply pipe. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0029] like Figure 1-6 As shown, the present invention proposes an automatic die for internal and external extrusion of bolt thrust caps, comprising an upper die 1, a lower die 2, and a water supply component 6;

[0030] The upper mold 1 is positioned above the lower mold 2;

[0031] The bottom of the upper mold 1 is equipped with a tapping punch 101, the middle of the lower mold 2 is provided with a loading groove, and a circulation cylinder seat 3 is installed in the loading groove. The middle of the circulation cylinder seat 3 is detachably equipped with a thread forming part 4 corresponding to the tapping punch 101.

[0032] The circulation cylinder seat 3 has a circulation chamber inside. The bottom of the circulation cylinder seat 3 is connected to a drain pipe 31. The top of the drain pipe 31 has an opening 311 that communicates with the circulation chamber. An elastic sealing member 5 that cooperates with the opening 311 is installed on the circulation cylinder seat 3. The water supply member 6 is used to transport coolant to the circulation chamber.

[0033] When the mold is closed, the upper mold 1 moves down and applies pressure to the elastic sealing member 5, causing it to deform elastically and move down accordingly. The elastic sealing member 5 seals the opening 311, and the water supply member 6 delivers the coolant to the circulation chamber. When the mold is opened, the upper mold 1 moves away from the lower mold 2, and the elastic sealing member 5 returns to its original position under the action of elasticity and opens the opening 311. The coolant enters the drain pipe 31 along the opening 311 and then is discharged.

[0034] During processing, the blank is placed into the thread forming part 4 in the lower mold 2, the upper mold 1 moves down, the tapping punch 101 moves down and rotates accordingly, tapping and extruding the inside of the blank. After tapping and extruding, the blank is rotated, and the thread forming part 4 forms external threads on the outer periphery of the blank, realizing the synchronous forming of internal and external threads.

[0035] It should be noted that during mold closing, the upper mold 1 moves downward, applying pressure to the elastic sealing component 5, causing its elastic deformation to follow and move downward. The elastic sealing component 5 seals the opening 311. The water supply component 6 delivers coolant to the circulation chamber, absorbing the heat from the thread forming component 4 through the inner wall of the circulation cylinder seat 3. The coolant absorbs the heat. During mold opening, the upper mold 1 moves away from the lower mold 2, and the elastic sealing component 5 returns to its original position under elastic action and opens the opening 311. The coolant flows through the opening 311 into the drain pipe 31 and then is discharged. The above achieves simultaneous forming of the inner and outer threads of the bolt thrust cap in one operation, reducing processing steps. Furthermore, the circulating coolant effectively controls the temperature rise of the forming cylinder seat 41 during long-term processing, ensuring the stability of thread forming. At the same time, the elastic sealing component 5 buffers the impact of the upper mold 1 moving downward when sealing the opening 311, protecting the mold structure. Moreover, the coolant is refreshed with each processing operation, ensuring the continuity of the cooling effect.

[0036] It should be further noted that the upper mold 1 is equipped with a motor that drives the tapping punch 101 to rotate. This is existing technology and will not be elaborated on here.

[0037] In this embodiment, the thread forming part 4 includes a forming cylinder seat 41, which is detachably installed in the middle of the circulating cylinder seat 3 and is located below the tapping punch 101. A forming cavity is provided inside the forming cylinder seat 41, and a spiral thread protrusion 42 is integrally formed on the inner wall of the forming cylinder seat 41. A spiral tapping thread 1011 is integrally formed on the outer circumference of the tapping punch 101.

[0038] When the upper die 1 moves down, it drives the tapping punch 101 to rotate and move down to tap and extrude threads inside the blank. The tapping threads 1011 on the outer periphery of the tapping punch 101 tap the inside of the blank. After the tapping is completed, it drives the blank to rotate. The thread protrusions 42 on the inner wall of the forming cylinder 41 form external threads on the outer periphery of the blank. The above can achieve simultaneous forming of internal and external threads.

[0039] In this embodiment, the outer periphery of both the tapping thread 1011 and the thread protrusion 42 is arc-shaped, so that the inner and outer threads of the bolt thrust cap form a spiral arc structure. When the tapping punch 101 rotates and moves downward, the arc-shaped tapping thread 1011 taps the inside of the blank. After tapping, it drives the blank to rotate. The arc-shaped thread protrusion 42 on the inner wall of the forming cylinder 41 forms an arc-shaped external thread on the outer periphery of the blank, so that the threads formed inside and outside the bolt thrust cap form a spiral arc structure. The above-mentioned arc-shaped thread design avoids sharp edges, which can prevent excessive screwing during subsequent use and improve the controllability of product assembly.

[0040] In this embodiment, a threaded groove is provided in the middle of the circulating cylinder seat 3, and the forming cylinder seat 41 is threadedly connected in the threaded groove, and the threaded groove in the middle of the circulating cylinder seat 3 is not connected to the circulating cavity inside it.

[0041] When installing the thread forming part 4, the forming cylinder seat 41 is installed in the threaded groove in the middle of the circulating cylinder seat 3 through a threaded connection, which facilitates the installation and disassembly of the thread forming part 4 and makes it easy to replace the thread forming part 4 of different specifications to adapt to the processing of bolt thrust caps of different specifications.

[0042] In this embodiment, the elastic sealing member 5 includes a shaft 51, an elastic part 52 and a sealing head 53. The shaft 51 is vertically arranged in the circulation cavity of the circulation cylinder seat 3 through the elastic part 52, and the top end of the shaft 51 slides through the top of the circulation cylinder seat 3. The bottom end of the shaft 51 is equipped with a sealing head 53 located above the drain pipe 31, and the sealing head 53 corresponds to the opening 311.

[0043] When the mold is closed, the upper mold 1 moves downward and applies pressure to the top of the shaft 51. The shaft 51 moves downward against the elastic force of the elastic part 52, driving the sealing head 53 to move downward and block the opening 311 on the drain pipe 31. Then, the coolant is transported to the circulation chamber in the circulation cylinder seat 3 through the water supply part 6. When the mold is opened, the upper mold 1 moves upward, and the shaft 51 moves upward under the elastic force of the elastic part 52, driving the sealing head 53 to move upward and open the opening 311, so that the coolant is discharged. The above realizes the automatic sealing and discharge of coolant, ensuring the normal operation of the cooling system in different working stages, while buffering the impact of the upper mold 1 moving downward and protecting the mold structure.

[0044] In this embodiment, the elastic part 52 includes a spring 521 and a loading shaft 522. The loading shaft 522 is fixedly mounted on the shaft 51. The spring 521, which is sleeved on the shaft 51, is fixed on the loading shaft 522. The top end of the spring 521 is connected to the top wall of the circulation cavity. When the mold is closed, the upper mold 1 moves down to apply pressure to the top end of the shaft 51. The shaft 51 drives the loading shaft 522 to move downward, stretching the spring 521. When the mold is opened, the upper mold 1 moves up, the spring 521 recovers its deformation, and pushes the loading shaft 522 and the shaft 51 to move upward, so that the sealing head 53 opens the opening 311.

[0045] In this embodiment, the water supply component 6 includes a water pump 61 and a water supply pipe 62. The bottom of the circulation cylinder seat 3 is connected to the water supply pipe 62, which communicates with the circulation cavity. The end of the water supply pipe 62 away from the circulation cylinder seat 3 is connected to the water pump 61. When it is necessary to introduce coolant into the circulation cylinder seat 3, the water pump 61 delivers the coolant along the water supply pipe 62 to the circulation cavity in the circulation cylinder seat 3. This ensures a continuous supply of coolant, which can cool the forming cylinder seat 41 in a timely manner, control its temperature rise, and ensure the stability of the thread forming.

[0046] In this embodiment, a liquid level sensor 301 is installed in the circulation chamber, and a controller 21 is installed on the outside of the lower mold 2. The liquid level sensor 301 and the water pump 61 are both electrically connected to the controller 21. The liquid level sensor 301 monitors the liquid level in the circulation chamber in real time and transmits the signal to the controller 21. When the mold is opened, the coolant in the circulation chamber will be discharged through the drain pipe 31. When the mold is closed, the coolant can be transported to the circulation chamber through the water supply pipe 62 by the water pump 61. The liquid level sensor 301 can monitor the coolant volume in the circulation chamber. When a certain amount is reached, the water pump 61 can be stopped by the controller 21.

[0047] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.

Claims

1. An automatic die for extruding inner and outer threads of a bolt thrust cap, characterized in that, Includes upper mold (1), lower mold (2) and water supply component (6); The upper mold (1) is positioned above the lower mold (2); The bottom of the upper mold (1) is equipped with a tapping punch (101), the middle of the lower mold (2) is provided with a loading groove, and a circulation cylinder seat (3) is installed in the loading groove. The middle of the circulation cylinder seat (3) is detachably equipped with a thread forming part (4) corresponding to the tapping punch (101). The circulation cylinder seat (3) has a circulation chamber inside. The bottom of the circulation cylinder seat (3) is connected to a drain pipe (31). The top of the drain pipe (31) has an opening (311) that communicates with the circulation chamber. An elastic sealing member (5) that cooperates with the opening (311) is installed on the circulation cylinder seat (3). The water supply member (6) is used to transport coolant to the circulation chamber. When the mold is closed, the upper mold (1) moves down and applies pressure to the elastic sealing part (5), causing it to deform and move down. The elastic sealing part (5) seals the opening (311), and the water supply part (6) delivers the coolant to the circulation chamber. When the mold is opened, the upper mold (1) moves away from the lower mold (2), and the elastic sealing part (5) returns to its original position under the action of elasticity and opens the opening (311). The coolant enters the drain pipe (31) through the opening (311) and then is discharged.

2. The automatic die for extruding inner and outer threads of a bolt thrust cap according to claim 1, characterized in that, The thread forming part (4) includes a forming cylinder seat (41), which is detachably installed in the middle of the circulating cylinder seat (3) and is located below the tapping punch (101). A forming cavity is provided inside the forming cylinder seat (41), and the inner wall of the forming cylinder seat (41) is integrally formed with a thread protrusion (42) in a spiral structure. The outer circumference of the tapping punch (101) is integrally formed with a tapping thread (1011) in a spiral structure.

3. The automatic die for extruding inner and outer threads of a bolt thrust cap according to claim 2, characterized in that, The outer periphery of both the tapping thread (1011) and the thread protrusion (42) is arc-shaped, so that the inner and outer threads of the bolt thrust cap form a spiral arc structure.

4. The automatic die for extruding inner and outer threads of a bolt thrust cap according to claim 2, characterized in that, The circulation cylinder seat (3) has a threaded groove in the middle, and the forming cylinder seat (41) is threadedly connected in the threaded groove. The threaded groove in the middle of the circulation cylinder seat (3) is not connected to the circulation cavity inside it.

5. The automatic die for extruding inner and outer threads of a bolt thrust cap according to claim 1, characterized in that, The elastic sealing member (5) includes a shaft (51), an elastic part (52) and a sealing head (53). The shaft (51) is vertically arranged in the circulation cavity of the circulation cylinder seat (3) through the elastic part (52), and the top end of the shaft (51) slides through the top of the circulation cylinder seat (3). The bottom end of the shaft (51) is equipped with a sealing head (53) located above the drain pipe (31), and the sealing head (53) corresponds to the opening (311).

6. The automatic die for extruding inner and outer threads of a bolt thrust cap according to claim 5, characterized in that, The elastic part (52) includes a spring (521) and a loading shaft (522). The loading shaft (522) is fixedly mounted on the shaft (51). The spring (521) is fixedly mounted on the loading shaft (522) and the top end of the spring (521) is connected to the top wall inside the circulation cavity.

7. The automatic die for extruding inner and outer threads of a bolt thrust cap according to claim 1, characterized in that, The water supply component (6) includes a water pump (61) and a water supply pipe (62). The bottom of the circulation cylinder seat (3) is connected to the water supply pipe (62) which communicates with the circulation chamber, and the end of the water supply pipe (62) away from the circulation cylinder seat (3) is connected to the water pump (61).

8. The automatic die for extruding inner and outer threads of a bolt thrust cap according to claim 7, characterized in that, A liquid level sensor (301) is installed inside the circulation chamber, and a controller (21) is installed on the outside of the lower mold (2). The liquid level sensor (301) and the water pump (61) are both electrically connected to the controller (21).

Images