Automatic thread rolling machine for automotive fasteners

Abstract

The application relates to the technical field of screw production, and discloses an automatic thread rolling machine for automobile fasteners, which comprises a workbench, the upper surface of the workbench is fixedly connected with a first guide plate and a static thread rolling block, and a dynamic thread rolling block is arranged on one side surface of the first guide plate along the length direction. The automatic thread rolling machine for automobile fasteners is provided with a serpentine cooling cavity in the dynamic thread rolling block and is connected with a cooling water circulating device, so that the heat generated by the dynamic thread rolling block due to friction during reciprocating motion is effectively cooled and radiated, the service life of the dynamic thread rolling block is prolonged, the stability of the thread forming quality is ensured, the qualified rate of the automobile fasteners is improved, the cleaning pipe provided with a high-pressure air nozzle is arranged at the front end of the static thread rolling block, timely air blowing and cleaning of the working surface of the dynamic thread rolling block are realized, iron filings generated during thread rolling are prevented from being clamped in the thread to affect the thread rolling quality and the service life of the thread plate, and the overall performance and working effect of the thread rolling machine are improved.

Description

Technical Field

[0001] This application relates to the field of screw manufacturing technology, specifically an automatic thread rolling machine for automotive fasteners. Background Technology

[0002] A thread rolling machine consists of two identical rolling plates with the same thread profile and helix angle as the bolt thread. When the rolling plates move relative to each other, they roll the thread out of the bolt blank between the two rolling plates.

[0003] An existing patent (publication number: CN222268551U) discloses a screw thread rolling machine die plate; it includes a base plate, a first fixed plate on the base plate, threads on both the moving die plate and the sliding die plate, a groove on the first fixed plate, the sliding die plate slidingly engaging with the groove, the moving die plate slidingly connected to the base plate, and an adjustment component for adjusting the distance between the moving die plate and the sliding die plate. The adjustment component includes an adjustment motor, a first drive shaft, a cam, multiple sets of slide rods, multiple sets of springs, multiple sets of connecting plates, and a second fixed plate. The adjustment motor is fixedly mounted on the base plate, the first drive shaft is connected to the output end of the adjustment motor, the cam is fixedly mounted on the first drive shaft, and the cam slides against the moving die plate. The second fixed plate is fixedly mounted on the base plate. This utility model provides a screw thread rolling machine die plate that can adjust the distance between the moving die plate and the sliding die plate without the need for tools, saving time and effort, and is therefore easy to adjust.

[0004] Because a large amount of frictional heat is generated during the thread rolling process, and there is a lack of effective cooling and heat dissipation mechanisms, the temperature of the moving thread plate rises sharply. Excessive temperature not only accelerates the thermal fatigue of the thread plate material, reducing its hardness and aggravating wear, thus greatly shortening the service life of the thread plate, but also affects the forming quality of the thread, causing problems such as unstable thread dimensions and excessive surface roughness, reducing the pass rate of automotive fasteners. Secondly, during the thread rolling process, a large number of fine iron filings are generated when the metal material is extruded and deformed. These iron filings are very easy to stick to the surface of the thread plate. If they are not cleaned in time, they will continue to accumulate as the thread rolling continues, which also affects the machining accuracy of the thread. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides an automatic thread rolling machine for automotive fasteners, which has advantages such as improved thread rolling accuracy and solves the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: an automatic thread rolling machine for automotive fasteners, comprising a worktable, wherein a first guide plate and a stationary thread rolling block are fixedly connected to the upper surface of the worktable, and a movable thread rolling block is provided on one side of the first guide plate along its length direction, and the movable thread rolling block and the stationary thread rolling block are provided with thread rolling threads for performing thread rolling on their sides that are close to each other. The upper surface of the moving thread rolling block has a serpentine cooling channel along its length. The two ends of the serpentine cooling channel are respectively fixedly connected to an input pipe and an output pipe, which extend to one end of the moving thread rolling block. Both ends of the serpentine cooling channel are fixedly connected to flexible hoses. Two guide rings are fixedly connected to the side of the first guide plate away from the stationary thread rolling block. The two flexible hoses are respectively inserted into their corresponding guide rings. The outer surfaces of the two flexible hoses are fixedly connected to fixed rings. Each fixed ring is fixedly connected to its corresponding guide ring with a compression spring. Each compression spring is respectively sleeved with its corresponding flexible hose. A gap is provided between the moving thread rolling block and the stationary thread rolling block to allow the screw to pass through.

[0007] Furthermore, a first groove is provided at the top of the first guide plate, and a second groove is provided on the upper surface of the worktable. The moving thread rolling block is slidably connected to the first groove and the second groove respectively.

[0008] With the above scheme, the moving thread rolling block can move linearly and stably along the first and second slide grooves, ensuring the smoothness and accuracy of the thread rolling process.

[0009] Furthermore, the rear end of the moving thread rolling block is hinged to a connecting rod, and the other end of the connecting rod is hinged to an external eccentric wheel.

[0010] With the above scheme, the eccentric wheel rotates under the drive of an external motor, and drives the moving thread rolling block to perform reciprocating linear motion through the connecting rod, thereby realizing the thread rolling action. The drive mechanism is a common structure in which the motor drives the eccentric wheel to rotate, which is the existing technology. The reciprocating motion of the moving thread rolling block is realized through this structure.

[0011] Furthermore, a feeding block is fixedly connected to the upper surface of the workbench. The feeding block is located at the rear end of the stationary thread rolling block, and the feeding block and the stationary thread rolling block surround an L-shaped feeding groove. A cylinder is provided at the corner of the L-shaped feeding groove, and a pusher plate is fixedly connected to the output end of the cylinder.

[0012] With the above scheme, the output end of the cylinder pushes the pusher plate, which can push the screw material in the L-shaped feeding groove into the space between the moving and stationary thread rolling blocks. Through the linear movement of the moving thread rolling blocks, the surface of the material is thread rolled. When the maximum stroke is reached, the bottom of the material lacks the support of the worktable, and the material is automatically dropped into the collection device.

[0013] Furthermore, a U-shaped limiting sleeve is fixedly connected to the upper surface of the moving thread rolling block.

[0014] With the above scheme, when the moving thread rolling block is reset, the U-shaped limiting sleeve and the L-shaped feeding groove are at the same horizontal position. When the pusher plate pushes the screw material into the gap between the moving and stationary thread rolling blocks, the top of the screw material can simultaneously enter the U-shaped limiting sleeve and contact the two inner walls of the U-shaped limiting sleeve. During the process of the moving thread rolling block driving the screw material, the perpendicularity of the screw material to the worktable can be guaranteed, thus ensuring the thread rolling quality.

[0015] Furthermore, a cleaning tube is fixedly installed at the front end of the stationary thread rolling block along its height direction. A linearly arranged high-pressure air nozzle is fixedly connected to the outer surface of the cleaning tube, with the high-pressure air nozzle facing the moving thread rolling block. The bottom end of the cleaning tube is connected to the output end of an external air pump.

[0016] Through the above scheme, during the reciprocating motion of the moving thread rolling block, the working surface of the moving thread rolling block extending out of the worktable can be cleaned by blowing air, so as to prevent iron filings generated by thread rolling from getting stuck in the teeth of the working surface of the moving thread rolling block, thereby affecting the thread rolling quality and the life of the die plate. Due to the large weight of the material, the air nozzle cannot stop the material from falling during the material dropping process, so as to achieve the vertical dropping of the material to the designated position.

[0017] Furthermore, the moving thread rolling block is made of copper alloy.

[0018] The above solution facilitates the rapid removal of heat by the cooling water in the serpentine cooling channel, while also ensuring the strength and hardness of the moving thread rolling block to meet the requirements of thread rolling operation.

[0019] Furthermore, the working surface of the moving thread rolling block is coated with a hard chrome plating.

[0020] The above solution has good hardness and wear resistance. During the thread rolling process, the working surface of the moving thread rolling block comes into frequent contact and friction with the screw material. The hard chrome plating can effectively resist the wear caused by friction and extend the service life of the working surface of the moving thread rolling block.

[0021] Compared with the prior art, the technical solution of this application has the following beneficial effects: This automatic thread rolling machine for automotive fasteners effectively cools and dissipates heat generated by friction during the reciprocating motion of the moving thread rolling block by setting a serpentine cooling channel inside the moving thread rolling block and connecting it to a cooling water circulation device. This avoids thermal fatigue, decreased hardness, and accelerated wear of the thread plate material caused by excessive temperature, thereby extending the service life of the moving thread rolling block. At the same time, it ensures the stability of thread forming quality and improves the pass rate of automotive fasteners. By setting a cleaning pipe with a high-pressure air nozzle at the front end of the stationary thread rolling block, timely air blowing cleaning of the working surface of the moving thread rolling block is achieved, preventing iron filings generated during thread rolling from getting stuck in the thread and affecting the thread rolling quality and the life of the thread plate. This achieves the goal of improving the overall performance and working effect of the thread rolling machine.

[0022] By fixing a U-shaped limiting sleeve to the upper surface of the moving thread rolling block, when the pusher plate pushes the screw material into the gap between the moving and stationary thread rolling blocks, the top of the screw material can simultaneously enter the U-shaped limiting sleeve and contact the two inner walls, ensuring the perpendicularity of the screw material to the worktable, thereby ensuring the thread rolling quality. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this application. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of this application. Figure 2 ; Figure 3 This is a schematic diagram of the overall structure of this application. Figure 3 ; Figure 4 This is a structural diagram of the moving thread rolling block in this application; Figure 5 Here are structural diagrams of the first and second slides of this application; Figure 6 This is a structural diagram of the serpentine cooling channel of this application.

[0024] In the picture: 1. Workbench; 2. First guide plate; 3. Stationary thread rolling block; 4. Moving thread rolling block; 5. Serpentine cooling channel; 6. Input pipe; 7. Output pipe; 8. Hose; 9. Guide ring; 10. Fixing ring; 11. Compression spring; 12. First slide groove; 13. Second slide groove; 14. Connecting rod; 15. Feeding block; 16. L-shaped feeding trough; 17. Cylinder; 18. Push plate; 19. U-shaped limit sleeve; 20. Cleaning pipe; 21. High-pressure air nozzle. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Please see Figures 1-6An automatic thread rolling machine for automotive fasteners according to this embodiment includes a worktable 1. A first guide plate 2 and a stationary thread rolling block 3 are fixedly connected to the upper surface of the worktable 1. A movable thread rolling block 4 is provided on one side of the first guide plate 2 along its length. The movable thread rolling block 4 and the stationary thread rolling block 3 are provided with thread rolling threads for thread rolling on their sides that are close to each other. A first groove 12 is provided at the top of the first guide plate 2. A second groove 13 is provided on the upper surface of the worktable 1. The movable thread rolling block 4 is slidably connected to the first groove 12 and the second groove 13 respectively. The above arrangement enables the movable thread rolling block 4 to move linearly and stably along the first groove 12 and the second groove 13, ensuring the smoothness and accuracy of the thread rolling process.

[0027] The rear end of the moving thread rolling block 4 is hinged to a connecting rod 14, and the other end of the connecting rod 14 is hinged to an external eccentric wheel. The eccentric wheel rotates under the drive of an external motor, which in turn drives the moving thread rolling block 4 to perform reciprocating linear motion through the connecting rod 14, thereby realizing the thread rolling action. The drive mechanism is a common structure where the motor drives the eccentric wheel to rotate, which is existing technology. The reciprocating motion of the moving thread rolling block 4 is achieved through this structure. The front end of the stationary thread rolling block 3 is fixedly installed with a cleaning tube 20 arranged along its height direction, and the outer surface of the cleaning tube 20 is fixedly connected to... There are linearly arranged high-pressure air nozzles 21 facing the moving thread rolling block 4. The bottom end of the cleaning pipe 20 is connected to the output end of an external air pump. During the reciprocating motion of the moving thread rolling block 4, air can be blown to clean the working surface of the moving thread rolling block 4 that extends out of the worktable 1, so as to prevent iron filings generated by thread rolling from getting stuck in the teeth of the working surface of the moving thread rolling block 4, thereby affecting the thread rolling quality and the life of the tooth plate. Due to the large weight of the material, the air nozzles cannot block the material from falling during the material dropping process, so as to realize the vertical dropping of the material to the designated position.

[0028] A serpentine cooling channel 5 is provided along the length of the upper surface of the moving thread rolling block 4. An input pipe 6 and an output pipe 7 are fixedly connected to both ends of the serpentine cooling channel 5, respectively. The input pipe 6 and the output pipe 7 extend to one end of the moving thread rolling block 4. Flexible hoses 8 are fixedly connected to both ends of the serpentine cooling channel 5. Two guide rings 9 are fixedly connected to the side of the first guide plate 2 away from the stationary thread rolling block 3. The two flexible hoses 8 are respectively inserted into their corresponding guide rings 9. Fixing rings 10 are fixedly connected to the outer surfaces of the two flexible hoses 8. A compression spring 11 is fixedly connected between each fixing ring 10 and its corresponding guide ring 9. Each compression spring 11 is sleeved onto its corresponding flexible hose 8. The other ends of the two flexible hoses 8 are respectively exposed to external cooling. The cooling water circulation equipment is a common cooling water supply and circulation device, which is an existing device. The cooling water cools the moving thread rolling block 4 through the serpentine cooling channel 5, preventing the moving thread rolling block 4 from generating a large amount of frictional heat due to continuous reciprocating motion, which would cause the temperature to be too high and affect its performance and service life. Secondly, through the setting of the hose 8, the moving thread rolling block 4 pulls the hose 8 to slide in the guide ring 9 during the movement, which can prevent the hose 8 from being damaged due to excessive pulling. Furthermore, during the movement of the hose 8, the fixed ring 10 and the guide ring 9 move closer to each other, squeezing the compression spring 11. When the moving thread rolling block 4 returns to its original position, the elastic force of the compression spring 11 pushes the fixed ring 10 and the hose 8 to return to their original position, ensuring smooth cooling water circulation and avoiding entanglement and compression.

[0029] The moving thread rolling block 4 is made of copper alloy, which facilitates the rapid removal of heat by the cooling water in the serpentine cooling channel 5 while ensuring the strength and hardness of the moving thread rolling block 4 to meet the requirements of thread rolling. The working surface of the moving thread rolling block 4 is coated with hard chrome, which has good hardness and wear resistance. During the thread rolling process, the working surface of the moving thread rolling block 4 frequently comes into contact with and rubs against the screw material. The hard chrome coating can effectively resist the wear caused by friction and extend the service life of the working surface of the moving thread rolling block 4. A gap is provided between the moving thread rolling block 4 and the stationary thread rolling block 3 for the screw to pass through. The upper surface of the worktable 1 is fixedly connected to the upper... Material block 15, the feeding block 15 is located at the rear end of the stationary thread rolling block 3, and the feeding block 15 and the stationary thread rolling block 3 surround an L-shaped feeding groove 16. A cylinder 17 is set at the corner of the L-shaped feeding groove 16. The output end of the cylinder 17 is fixedly connected to a pusher plate 18. The output end of the cylinder 17 pushes the pusher plate 18, which can push the screw material in the L-shaped feeding groove 16 into the space between the moving thread rolling block 4 and the stationary thread rolling block 3. Through the linear movement of the moving thread rolling block 4, the surface of the material is thread rolled. When the maximum stroke is reached, the bottom of the material lacks the support of the worktable 1, and the material is automatically dropped into the collection device.

[0030] A U-shaped limiting sleeve 19 is fixedly connected to the upper surface of the moving thread rolling block 4. When the moving thread rolling block 4 is reset, the U-shaped limiting sleeve 19 and the L-shaped feeding groove 16 are at the same horizontal position. When the pusher plate 18 pushes the screw material into the gap between the moving thread rolling block 4 and the stationary thread rolling block 3, the top of the screw material can simultaneously enter the U-shaped limiting sleeve 19 and contact the two inner walls of the U-shaped limiting sleeve 19. During the process of the moving thread rolling block 4 driving the screw material, the perpendicularity of the screw material to the worktable 1 can be guaranteed, thus ensuring the thread rolling quality.

[0031] The working principle of the above embodiment is as follows: First, a feeding operation is performed. A feeding block 15 is fixed on the upper surface of the workbench 1, which together with the stationary thread rolling block 3 forms an L-shaped feeding groove 16. A cylinder 17 is installed at the corner of the feeding groove, and the pusher plate 18 connected to its output end is in the initial position. After the screw material is put into the L-shaped feeding groove 16, the cylinder 17 is started. The output end of the cylinder 17 pushes the pusher plate 18, pushing the screw material into the gap between the moving thread rolling block 4 and the stationary thread rolling block 3. The U-shaped limiting sleeve 19 fixed on the upper surface of the moving thread rolling block 4 is at the same horizontal position as the L-shaped feeding groove 16. The top of the screw material enters the U-shaped limiting sleeve 19 and contacts the two inner walls, ensuring the perpendicularity of the screw material to the workbench 1, which is beneficial to the subsequent thread rolling quality.

[0032] Next, the external motor is started, which drives the eccentric wheel to rotate. The eccentric wheel drives the moving thread rolling block 4 to reciprocate linearly through the hinged connecting rod 14. The rear end of the moving thread rolling block 4 is hinged to the connecting rod 14. The first sliding groove 12 at the top of the first guide plate 2 and the second sliding groove 13 on the upper surface of the worktable 1 provide a stable sliding track for the moving thread rolling block 4, allowing it to move smoothly and linearly along the track. The side of the moving thread rolling block 4 that is close to the stationary thread rolling block 3 is provided with thread rolling threads. During the reciprocating motion of the moving thread rolling block 4, friction is generated with the surface of the screw material, thereby performing thread rolling processing on the surface of the material. When the moving thread rolling block 4 generates frictional heat during its reciprocating motion, the serpentine cooling channel 5 inside it flows with coolant. The cooling water circulation device introduces cooling water into the serpentine cooling channel 5 from the input pipe 6 through the hose 8. The cooling water flows in the channel, carrying away the heat generated by the moving thread rolling block 4. The water flows back to the circulation equipment from the output pipe 7 through the hose 8 to achieve cooling and heat dissipation, preventing the moving thread rolling block 4 from being affected by excessive temperature, thus reducing its performance and service life. The hose 8 is connected to the moving thread rolling block 4 through the guide ring 9 and the compression spring 11. When the moving thread rolling block 4 moves, it pulls the hose 8 to slide in the guide ring 9. The fixed ring 10 and the guide ring 9 squeeze the compression spring 11. When resetting, the compression spring 11 pushes the hose 8 back to its original position, ensuring smooth circulation of cooling water. Finally, when the pusher plate 18 pushes the screw material to its maximum stroke, the bottom of the material lacks the support of the worktable 1, thus automatically dropping the material into the collection device. At the same time, the high-pressure air nozzle 21 on the front cleaning pipe 20 of the stationary thread rolling block 3 blows air to clean the working surface of the moving thread rolling block 4 when the moving thread rolling block 4 reciprocates, preventing iron filings from getting stuck in the thread and affecting the quality and life of the thread plate.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0034] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic thread rolling machine for automotive fasteners, comprising a worktable (1), characterized in that: The upper surface of the workbench (1) is fixedly connected to a first guide plate (2) and a stationary thread rolling block (3). A movable thread rolling block (4) is provided on one side of the first guide plate (2) along its length direction. The movable thread rolling block (4) and the stationary thread rolling block (3) are provided with thread rolling teeth for thread rolling. The upper surface of the moving thread rolling block (4) is provided with a serpentine cooling channel (5) along its length. The two ends of the serpentine cooling channel (5) are respectively fixedly connected to an input pipe (6) and an output pipe (7). The input pipe (6) and the output pipe (7) extend to one end of the moving thread rolling block (4). Both ends of the serpentine cooling channel (5) are fixedly connected to hoses (8). The side of the first guide plate (2) away from the stationary thread rolling block (3) is fixedly connected to two guide rings (9). The two hoses (8) are respectively inserted into their corresponding guide rings (9). The outer surfaces of the two hoses (8) are fixedly connected to fixed rings (10). Each fixed ring (10) is fixedly connected to its corresponding guide ring (9) with a compression spring (11). Each compression spring (11) is respectively sleeved with the corresponding hose (8). A gap is provided between the moving thread rolling block (4) and the stationary thread rolling block (3) for the screw to pass through.

2. The automatic thread rolling machine for automotive fasteners according to claim 1, characterized in that: The top of the first guide plate (2) is provided with a first groove (12), and the upper surface of the worktable (1) is provided with a second groove (13). The moving thread rolling block (4) is slidably connected to the first groove (12) and the second groove (13) respectively.

3. An automatic thread rolling machine for automotive fasteners according to claim 1, characterized in that: The rear end of the moving thread rolling block (4) is hinged to a connecting rod (14), and the other end of the connecting rod (14) is hinged to an external eccentric wheel.

4. An automatic thread rolling machine for automotive fasteners according to claim 1, characterized in that: The upper surface of the workbench (1) is fixedly connected to a feeding block (15), which is located at the rear end of the static thread rolling block (3). The feeding block (15) and the static thread rolling block (3) surround an L-shaped feeding groove (16). A cylinder (17) is provided at the corner of the L-shaped feeding groove (16), and a pusher plate (18) is fixedly connected to the output end of the cylinder (17).

5. An automatic thread rolling machine for automotive fasteners according to claim 1, characterized in that: The upper surface of the moving thread rolling block (4) is fixedly connected with a U-shaped limiting sleeve (19).

6. An automatic thread rolling machine for automotive fasteners according to claim 1, characterized in that: The front end of the static thread rolling block (3) is fixedly installed with a cleaning tube (20) arranged along its height direction. The outer surface of the cleaning tube (20) is fixedly connected with linearly arranged high-pressure air nozzles (21). The high-pressure air nozzles (21) face the moving thread rolling block (4). The bottom end of the cleaning tube (20) is connected to the output end of an external air pump.

7. An automatic thread rolling machine for automotive fasteners according to claim 1, characterized in that: The moving thread rolling block (4) is made of copper alloy.

8. An automatic thread rolling machine for automotive fasteners according to claim 1, characterized in that: The working surface of the moving thread rolling block (4) is coated with hard chrome.

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