Method and apparatus for preventing rivet cracking of hinge shafts

Abstract

This invention discloses a processing method and equipment for preventing hinge shaft cracking during riveting. The key technical points include a thread rolling device comprising a discharge track and an electrical control cabinet. The discharge track is obliquely oriented and has discharge grooves adapted to the hinge shafts. Several evenly arranged hinge shafts are placed on the discharge grooves. The discharge track is linear in structure and equipped with a high-frequency heating device adapted to the hinge shafts. The high-frequency heating device is electrically connected to the electrical control cabinet and includes a high-frequency heating bracket and a high-frequency heating conductive tube disposed within the bracket. This invention achieves this by simultaneously performing a tempering process on the hinge shafts via the high-frequency heating device during the thread rolling process, preventing cracking during riveting. This effectively avoids increasing production costs by using a mesh belt furnace and avoids time conflicts with the heat treatment of other products, thus preventing impact on overall production efficiency.

Description

Technical Field

[0001] This invention relates to the field of hinge shaft processing technology, specifically to a processing method and equipment for preventing hinge shaft cracking during riveting. Background Technology

[0002] Hinges are widely used connection structures in engineering. Hinge constraints limit the relative movement of connected parts within a plane, but allow relative rotation of components around a hinge axis. By limiting the rotation angle around the hinge axis, directional or fixed-angle rotation functions can be achieved in structures such as car doors. The hinge axis, as the core component of a hinge, typically passes through two connected parts, forming a relatively rotatable assembly. It is extremely common in industries such as automotive and machinery.

[0003] During actual production and after-sales inspections, the applicant discovered that hinge shafts processed only by the thread rolling process have excessively high surface hardness. This makes them highly susceptible to riveting cracks during subsequent riveting assembly of the riveted ends, severely impacting the hinge shaft's performance and assembly reliability. While companies can currently use equipment such as mesh belt furnaces to add a tempering process to the thread-rolled hinge shafts to reduce the hardness of the riveted ends and improve riveting performance, this process significantly increases production costs. Furthermore, the tempering process often conflicts with the heat treatment processes of other products, affecting overall production efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a processing method and equipment for preventing hinge shaft cracking during riveting. By simultaneously performing a tempering process on the hinge shaft through a high-frequency heating device when the hinge shaft is discharged after the thread rolling process, cracking of the hinge shaft during riveting is prevented. This effectively avoids increasing production costs by using a mesh belt furnace and also avoids time conflicts with the heat treatment of other products, thus preventing the impact on overall production efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a processing device for preventing hinge shaft riveting cracks, comprising a thread rolling device, the thread rolling device comprising a discharge track and an electrical control cabinet, characterized in that the discharge track is obliquely arranged and has a discharge groove adapted to the hinge shaft, a plurality of evenly arranged hinge shafts are placed on the discharge groove, the discharge track is arranged in a straight line, a high-frequency heating device adapted to the hinge shaft is arranged on the discharge track, the high-frequency heating device is electrically connected to the electrical control cabinet, the high-frequency heating device comprises a high-frequency heating bracket and a high-frequency heating conductive tube disposed within the high-frequency heating bracket.

[0006] By adopting the above technical solution, the high-frequency heating device uses electromagnetic induction to locally heat the riveting end of the hinge shaft, thereby completing the tempering process of the hinge shaft. This ensures that the riveting end of the hinge shaft will not crack after the hardness is reduced, while maintaining the hardness of the rest of the hinge shaft, thus ensuring the performance of the hinge shaft.

[0007] The present invention is further configured such that the high-frequency heating conductive tube is generally arranged in a U-shape, and the high-frequency heating conductive tube includes a first conductive straight section and two second conductive straight sections. The first conductive straight section is located on one side of the discharge chute, and the two conductive straight sections are on the other side of the discharge chute. The two ends of the first conductive straight section are respectively fixedly connected to one end of the two second conductive straight sections by means of conductive transition sections. The other ends of the two second conductive straight sections are electrically connected to the electrical control cabinet by means of conductive lead sections. The conductive transition sections are arranged in an arch or arc shape and span across the left and right sides of the discharge chute. The first conductive straight section, the two second conductive straight sections, the two conductive transition sections and the conductive lead sections are an integral structure.

[0008] By adopting the above technical solution, the high-frequency heating conductive tube, after being energized with high-frequency alternating current, causes high-frequency heating at the riveting end of the hinge shaft, thereby achieving local heating and completing the tempering process. The conductive transition part is designed with an arched or arc-shaped structure to prevent it from contacting the hinge shaft, ensuring that the hinge shaft passes smoothly on the discharge track. The high-frequency heating conductive tube is designed with a U-shaped structure to facilitate high-frequency heating.

[0009] The present invention is further configured such that the high-frequency heating bracket includes a first shielding frame and a second shielding frame respectively adapted to the first conductive straight section and the second conductive straight section. The first shielding frame and the second shielding frame are made of magnetic material. The cross-section of the first shielding frame and the second shielding frame is U-shaped. Conductive grooves adapted to the high-frequency heating conductive tube are opened in the first shielding frame and the second shielding frame. The lower ends of the first shielding frame and the second shielding frame are respectively fixed with a first bracket base plate and a second bracket base plate adapted to each other. The first bracket base plate, the second bracket base plate and the conductive groove cooperate with each other to form a conductive cavity. The first conductive straight section and the second conductive straight section pass through the conductive cavity. The first bracket base plate and the second bracket base plate are made of bakelite material.

[0010] By adopting the above technical solution, the first shielding frame and the second shielding frame can prevent electric radiation, and the first support base plate and the second support base plate can protect the high-frequency heating conductive tube.

[0011] The present invention is further configured such that a photoelectric sensor adapted to the high-frequency heating device is also provided on the discharge track. The photoelectric sensor is located on the side of the high-frequency heating device near the outlet end of the discharge track, and the photoelectric sensor is electrically connected to the electrical control cabinet.

[0012] By adopting the above technical solution, the photoelectric sensor is used to detect whether the hinge shaft in the discharge track is discharging material normally, so as to avoid the problem that the hinge shaft in the heating range of the high-frequency heating device will be heated and tempered for a long time when the material is stuck in the discharge track, which will affect the performance of the hinge shaft.

[0013] The present invention is further configured such that both the first shielding frame and the second shielding frame are composed of several powerful magnets sequentially spliced ​​together.

[0014] By adopting the above technical solution, the first shielding frame and the second shielding frame, which are spliced ​​together by strong magnets, can be freely combined according to the length of the first conductive straight section and the second conductive straight section to adapt to different types of high-frequency heating conductive tubes.

[0015] The present invention is further configured such that two lifting pneumatic actuators are provided on the left and right sides of the discharge track, and the piston rods of the pneumatic actuators are respectively connected to the bottom of the first support base plate and the second support base plate.

[0016] By adopting the above technical solution, the two pneumatic actuators move synchronously to raise or lower the first and second support base plates, thereby adjusting the height of the high-frequency heating conductive tube, so that hinge shafts with different lengths can be riveted.

[0017] On the other hand, the present invention provides the following technical solution: a processing method for preventing hinge shaft riveting cracks, wherein the riveting end of the hinge shaft is processed using the aforementioned processing equipment for preventing hinge shaft riveting cracks.

[0018] By adopting the above technical solution, the processing equipment that prevents hinge shaft riveting cracks can ensure that the riveted end of the hinge shaft completes the tempering process.

[0019] The present invention is further configured such that the processing method includes the following steps: Step 1, Feeding: The wire rolling equipment pushes the hinge shaft that has completed the wire rolling process onto the discharge track in preparation for heating and tempering; Step 2, Tempering: Under the control of the electrical control cabinet, the high-frequency heating device heats the riveting end of the hinge shaft passing through its range. The tempering process is completed after the hinge shaft passes through the area of ​​the high-frequency heating device on the discharge track. Step 3, Inspection: Under normal circumstances, after the tempering process is completed, the hinge shaft continues to slide in the discharge track to the photoelectric sensor. If the photoelectric sensor detects that the hinge shaft has passed, the discharge status is considered normal, and the next step is continued. Otherwise, if the photoelectric sensor does not detect that the hinge shaft has passed within a certain period of time, it is considered that there is a jam. The electrical control cabinet immediately controls the high-frequency heating device to stop heating, stops the tempering process, and notifies the staff to investigate the cause of the fault. After the fault is eliminated, the next step is continued. Step 4, Discharge: The hinge shaft that has completed the tempering process slides out from the outlet of the discharge track, thus completing the discharge process.

[0020] By adopting the above technical solution, the riveted end of the hinge shaft is locally heated. While ensuring the structural strength of other parts of the hinge shaft, the riveted end is tempered to reduce its hardness, thus avoiding cracking during riveting and ensuring the performance of the hinge shaft.

[0021] The present invention is further configured such that when the high-frequency heating device heats the riveted end of the hinge shaft, the heating temperature is 500-600℃.

[0022] By adopting the above technical solution, the riveted end of the hinge shaft can be effectively tempered.

[0023] The invention is further configured such that the hinge shaft passes through the area where the high-frequency heating device is located on the discharge track for 2-3 seconds.

[0024] By adopting the above technical solution, the riveted end of the hinge shaft can be effectively tempered.

[0025] In summary, the present invention has the following beneficial effects: 1. The high-frequency heating device uses electromagnetic induction to locally heat the riveted end of the hinge shaft, thereby completing the tempering process of the hinge shaft. This ensures that the riveted end of the hinge shaft will not crack after the hardness is reduced, while maintaining the hardness of the rest of the hinge shaft and ensuring its performance. 2. A photoelectric sensor is used to detect whether the hinge shaft in the discharge track is discharging material normally, so as to avoid the problem of prolonged heating and tempering of the hinge shaft within the heating range of the high-frequency heating device when material is stuck in the discharge track, which would affect the performance of the hinge shaft. Attached Figure Description

[0026] Figure 1 This is a perspective view of Example 1.

[0027] Figure 2 This is a schematic diagram of the structure of Embodiment 1.

[0028] Figure 3 for Figure 2 A cross-sectional view at point AA.

[0029] Figure 4 for Figure 3 A magnified view of a portion of point I in the middle.

[0030] Figure 5 for Figure 2 A cross-sectional view of section BB.

[0031] Figure 6 This is a schematic diagram of the structure of Example 2.

[0032] Figure 7 This is a schematic diagram of the structure of Example 3.

[0033] Figure 8 This is a flowchart of Example 4.

[0034] The attached figures are labeled as follows: 1. Discharge track; 11. Discharge chute; 2. Hinge shaft; 21. Riveting end; 3. High-frequency heating device; 31. High-frequency heating bracket; 311. First shielding frame; 312. Second shielding frame; 313. First bracket base plate; 314. Second bracket base plate; 32. High-frequency heating conductive tube; 321. First conductive straight section; 322. Second conductive straight section; 323. Conductive transition section; 324. Conductive lead section; 33. Strong magnet; 4. Photoelectric sensor; 5. Pneumatic actuator. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Example 1, as Figures 1 to 5 As shown, the present invention provides the following technical solution: a processing device for preventing riveting cracks in hinge shafts, comprising a thread rolling device, the thread rolling device comprising a discharge track 1 and an electrical control cabinet, the discharge track 1 being obliquely arranged and having a discharge groove 11 adapted to the hinge shaft 2, a plurality of evenly arranged hinge shafts 2 being placed on the discharge groove 11, the discharge track 1 being arranged in a straight line, and a high-frequency heating device 3 adapted to the hinge shaft 2 being provided on the discharge track 1, the high-frequency heating device 3 being electrically connected to the electrical control cabinet, the high-frequency heating device 3 using electromagnetic induction to locally heat the riveting end 21 of the hinge shaft 2 through high-frequency heating (induction heating), thereby completing the tempering process of the hinge shaft 2, ensuring that riveting cracks do not occur after the hardness of the riveting end 21 of the hinge shaft 2 is reduced, while retaining the hardness of the rest of the hinge shaft 2, thus ensuring the performance of the hinge shaft 2.

[0037] The high-frequency heating device 3 includes a high-frequency heating bracket 31 and a high-frequency heating conductive tube 32 disposed within the high-frequency heating bracket 31. When a high-frequency alternating current is applied to the high-frequency heating conductive tube 32, the riveting end 21 of the hinge shaft 2 experiences high-frequency heating, thereby achieving localized heating and completing the tempering process. The high-frequency heating conductive tube 32 includes a first conductive straight section 321 and two second conductive straight sections 322. The first conductive straight section 321 is located on one side of the discharge chute 11, and the two conductive straight sections are on the other side of the discharge chute 11. The two ends of the first conductive straight section 321 are connected by conductive... The transition section 323 is fixedly connected to one end of each of the two second conductive straight sections 322. The other ends of the two second conductive straight sections 322 are electrically connected to the electrical control cabinet via conductive leads 324. The conductive transition section 323 is arched or arc-shaped and spans across the left and right sides of the discharge chute 11. The arched or arc-shaped structure of the conductive transition section 323 prevents it from contacting the hinge shaft 2, ensuring that the hinge shaft 2 passes smoothly on the discharge track 1. The first conductive straight section 321, the two second conductive straight sections 322, the two conductive transition sections 323, and the conductive leads 324 are all connected together. The wire section 324 is an integral structure with an overall U-shaped structure. The high-frequency heating conductive tube 32 has an overall U-shaped structure to facilitate high-frequency heating. The high-frequency heating bracket 31 includes a first shielding frame 311 and a second shielding frame 312 that are respectively adapted to the first conductive straight section 321 and the second conductive straight section 322. The first shielding frame 311 and the second shielding frame 312 are made of magnetic material and can prevent electromagnetic radiation. The cross-section of the first shielding frame 311 and the second shielding frame 312 is U-shaped. Both the shielding frame 311 and the second shielding frame 312 have conductive grooves adapted to the high-frequency heating conductive tube 32. The lower ends of the first shielding frame 311 and the second shielding frame 312 are respectively fixed with a first support base plate 313 and a second support base plate 314 adapted to each other. The first support base plate 313, the second support base plate 314 and the conductive grooves cooperate with each other to form a conductive cavity. The first conductive straight part 321 and the second conductive straight part 322 pass through the conductive cavity. The first support base plate 313 and the second support base plate 314 are made of bakelite material, which protects the high-frequency heating conductive tube 32.

[0038] The discharge track 1 is also equipped with a photoelectric sensor 4 that is compatible with the high-frequency heating device 3. The photoelectric sensor 4 is located on the side of the high-frequency heating device 3 near the outlet end of the discharge track 1, that is, on the side of the high-frequency heating device 3 that is inclined downward. The photoelectric sensor 4 is electrically connected to the electrical control cabinet. The photoelectric sensor 4 is used to detect whether the hinge shaft 2 in the discharge track 1 is discharging normally. If the hinge shaft 2 continuously passes through the photoelectric sensor 4, it is considered that the discharge is normal. If the hinge shaft 2 does not pass through the photoelectric sensor 4 for a period of time, it is considered that the material is stuck. The specific time length is set according to the actual situation on site. When the material is stuck in the discharge track 1, the electrical control cabinet stops the heating process of the high-frequency heating device 3 to prevent the hinge shaft 2 located within the heating range of the high-frequency heating device 3 from being heated and tempered for a long time, which would affect the performance of the hinge shaft 2.

[0039] Example 2, this example is based on Example 1, such as... Figure 6 As shown, the first shielding frame 311 and the second shielding frame 312 are both composed of several powerful magnets 33 spliced ​​together in sequence. The first shielding frame 311 and the second shielding frame 312, which are spliced ​​together by powerful magnets 33, can be freely combined according to the length of the first conductive straight section 321 and the second conductive straight section 322 to adapt to different types of high-frequency heating conductive tubes 32.

[0040] Example 3, this example is based on Example 1, such as... Figure 7 As shown, two lifting pneumatic actuators 5 are also provided on the left and right sides of the discharge track 1. The piston rods of the pneumatic actuators 5 are connected to the bottom of the first support base plate 313 and the second support base plate 314 respectively. The two pneumatic actuators 5 move synchronously to raise or lower the first support base plate 313 and the second support base plate 314, thereby adjusting the height of the high-frequency heating conductive tube 32, so that the hinge shaft 2 with different lengths can be used.

[0041] In another aspect, according to Embodiment Four, the present invention provides the following technical solution, such as... Figures 1 to 8 As shown, a processing method for preventing hinge shaft riveting cracks includes the following steps: Step 1, feeding: The wire rolling equipment pushes the hinge shaft 2, which has completed the wire rolling process, onto the discharge track 1 in preparation for heating and tempering; Step 2, Tempering: Under the control of the electrical control cabinet, the high-frequency heating device 3 performs high-frequency heating on the riveting end 21 of the hinge shaft 2 passing through its range. The tempering process is completed after the hinge shaft 2 passes through the area of ​​the high-frequency heating device 3 on the discharge track 1. Step 3, Inspection: Under normal circumstances, after the tempering process is completed, the hinge shaft 2 continues to slide in the discharge track 1 to the photoelectric sensor 4. If the photoelectric sensor 4 detects that the hinge shaft 2 has passed, the discharge status is considered normal, and the next step is continued. Otherwise, if the photoelectric sensor 4 does not detect that the hinge shaft 2 has passed within a certain period of time, it is considered that there is a jam. The electrical control cabinet immediately controls the high-frequency heating device 3 to stop heating, stops the tempering process, and notifies the staff to investigate the cause of the fault. After the fault is eliminated, the next step is continued.

[0042] Step 4, Discharge: The hinge shaft 2, which has completed the tempering process, slides out from the outlet of the discharge track 1, thus completing the discharge process.

[0043] When the high-frequency heating device 3 heats the riveted end 21 of the hinge shaft 2, the heating temperature is 500-600℃; the time it takes for the hinge shaft 2 to pass through the area where the high-frequency heating device 3 is located on the discharge track 1 is 2-3 seconds.

[0044] In summary, the present invention has the following beneficial effects: 1. The high-frequency heating device 3 uses electromagnetic induction to locally heat the riveting end 21 of the hinge shaft 2 through high-frequency heating, thereby completing the tempering process of the hinge shaft 2. While ensuring that the riveting end 21 of the hinge shaft 2 will not crack after the hardness is reduced, the hardness of the rest of the hinge shaft 2 is preserved, thus ensuring the performance of the hinge shaft 2. 2. The photoelectric sensor 4 is used to detect whether the hinge shaft 2 in the discharge track 1 is discharging material normally, so as to avoid the problem that the hinge shaft 2 in the heating range of the high-frequency heating device 3 will be heated and tempered for a long time when the material is stuck in the discharge track 1, which will affect the performance of the hinge shaft 2.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present invention should be included within the protection scope of the present invention.

Claims

1. A processing device for preventing hinge shaft riveting cracks, comprising a thread rolling device, the thread rolling device including a discharge track (1) and an electrical control cabinet, characterized in that, The discharge track (1) is obliquely arranged and has a discharge chute (11) adapted to the hinge shaft (2) on it. Several hinge shafts (2) are placed on the discharge chute (11). The discharge track (1) is arranged in a straight line. A high-frequency heating device (3) adapted to the hinge shaft (2) is provided on the discharge track (1). The high-frequency heating device (3) is electrically connected to the electrical control cabinet. The high-frequency heating device (3) includes a high-frequency heating bracket (31) and a high-frequency heating conductive tube (32) arranged in the high-frequency heating bracket (31).

2. The processing equipment for preventing hinge shaft cracking under riveting according to claim 1, characterized in that, The high-frequency heating conductive tube (32) is arranged in a U-shape. The high-frequency heating conductive tube (32) includes a first conductive straight section (321) and two second conductive straight sections (322). The first conductive straight section (321) is located on one side of the discharge chute (11), and the two conductive straight sections are on the other side of the discharge chute (11). The two ends of the first conductive straight section (321) are fixedly connected to one end of the two second conductive straight sections (322) respectively by providing conductive transition sections (323). The two second conductive straight sections (322) The other end is electrically connected to the electrical control cabinet by means of a conductive lead part (324). The conductive transition part (323) is arranged in an arch or arc shape and spans the left and right sides of the discharge chute (11). The first conductive straight part (321), the two second conductive straight parts (322), the two conductive transition parts (323) and the conductive lead part (324) are arranged as an integral structure.

3. The processing equipment for preventing hinge shaft riveting cracks according to claim 2, characterized in that, The high-frequency heating bracket (31) includes a first shielding frame (311) and a second shielding frame (312) respectively adapted to the first conductive straight section (321) and the second conductive straight section (322). The first shielding frame (311) and the second shielding frame (312) are made of magnetic material. The cross-section of the first shielding frame (311) and the second shielding frame (312) is arranged in a U-shape. The first shielding frame (311) and the second shielding frame (312) are each provided with a high-frequency heating conductive tube ( 32) The lower ends of the first shielding frame (311) and the second shielding frame (312) are respectively fixed with a first support base plate (313) and a second support base plate (314). The first support base plate (313) and the second support base plate (314) cooperate with the conductive groove to form a conductive cavity. The first conductive straight part (321) and the second conductive straight part (322) pass through the conductive cavity. The first support base plate (313) and the second support base plate (314) are made of bakelite material.

4. The processing equipment for preventing hinge shaft riveting cracks according to claim 3, characterized in that, The discharge track (1) is also equipped with a photoelectric sensor (4) adapted to the high-frequency heating device (3). The photoelectric sensor (4) is located on the side of the high-frequency heating device (3) near the outlet end of the discharge track (1). The photoelectric sensor (4) is electrically connected to the electrical control cabinet.

5. The processing equipment for preventing hinge shaft riveting cracks according to claim 4, characterized in that, The first shielding frame (311) and the second shielding frame (312) are both composed of several powerful magnets (33) spliced ​​together in sequence.

6. The processing equipment for preventing hinge shaft riveting cracking according to claim 4, characterized in that, Two lifting pneumatic actuators (5) are also provided on the left and right sides of the discharge track (1). The piston rods of the pneumatic actuators (5) are respectively connected to the bottom of the first support base plate (313) and the second support base plate (314).

7. A processing method for preventing hinge shaft cracking during riveting, characterized in that, The riveting end (21) of the hinge shaft (2) is processed using a processing device for preventing hinge shaft riveting cracks as described in any one of claims 1-6.

8. A processing method for preventing hinge shaft riveting cracks according to claim 7, characterized in that, The processing method includes the following steps: Step 1, feeding: The wire rolling equipment pushes the hinge shaft (2) that has completed the wire rolling process onto the discharge track (1) in preparation for heating and tempering; Step 2, Tempering: Under the control of the electrical control cabinet, the high-frequency heating device (3) heats the riveting end (21) of the hinge shaft (2) within its range. The tempering process is completed after the hinge shaft (2) passes through the area of ​​the high-frequency heating device (3) on the discharge track (1). Step 3, Inspection: Under normal circumstances, after the tempering process is completed, the hinge shaft (2) continues to slide in the discharge track (1) to the photoelectric sensor (4). If the photoelectric sensor (4) detects that the hinge shaft (2) has passed, it is considered that the discharge status is normal and the next step is continued. Otherwise, if the photoelectric sensor (4) does not detect that the hinge shaft (2) has passed within a period of time, it is considered that there is a jam. The electrical control cabinet immediately controls the high-frequency heating device (3) to stop heating, stops the tempering process, and notifies the staff to investigate the cause of the fault. After the fault is eliminated, the next step is continued. Step 4, Discharge: The hinge shaft (2) that has completed the tempering process slides out from the outlet of the discharge track (1), thus completing the discharge process.

9. A processing method for preventing hinge shaft riveting cracks according to claim 7, characterized in that, When the high-frequency heating device (3) heats the riveted end (21) of the hinge shaft (2), the heating temperature is 500-600℃.

10. A processing method for preventing hinge shaft riveting cracks according to claim 7, characterized in that, The hinge shaft (2) passes through the area of ​​the high-frequency heating device (3) on the discharge track (1) for 2-3 seconds.

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