Bolt heat treatment processing technology

Abstract

The invention relates to a bolt heat treatment machining process. The bolt heat treatment machining process comprises the steps that S1, automatic feeding is conducted; s2, automatic cleaning is conducted, specifically, the bolts are fed into a cleaning mechanism through a magnetic tape type feeding machine, the bolts are sequentially transferred and soaked in cleaning pools with different cleaning solutions through the cleaning mechanism, and finally the cleaned bolts are automatically dried to remove surface stains; s3, controllable atmosphere heating and heat preservation; s4, quenching is conducted; the heated bolt is transferred into an oil quenching tank to be quenched, the oil temperature of the oil quenching tank is kept at 65-95 DEG C, and it is ensured that the oil temperature is uniform through multi-direction jet flow; s5, deoiling is carried out; s6, tempering is conducted, specifically, the cleaned bolt is fed into a tempering furnace, tempering treatment is conducted within the temperature range of 100-750 DEG C, the tempering time is controlled to be 50-250 minutes, and the furnace temperature uniformity is controlled to be within + / -5 DEG C; and S7, cooling and discharging. According to the cleaning device, pollution to the surrounding environment during cleaning can be reduced, and the cleaning device is more environmentally friendly, high in mechanization degree and capable of meeting the requirement for large-batch production of factories.

Description

Technical Field

[0001] This application relates to the technical field of bolt processing, and in particular to a bolt heat treatment process. Background Technology

[0002] Currently, heat treatment is a key process for improving the mechanical properties of bolts, such as strength, hardness, toughness, and fatigue life, especially for high-strength bolts. The purpose of heat treatment is to improve the microstructure of the raw materials, eliminate network carbides, and facilitate subsequent cold heading machining.

[0003] Thorough and proper cleaning before bolt heat treatment is a crucial preliminary step to ensure heat treatment quality, prevent surface defects such as decarburization, oxidation, and quenching soft spots, improve the adhesion of subsequent coatings, and achieve green manufacturing. The main purposes of cleaning include: removing organic contaminants such as oil, cutting fluid, and rust-preventive oil to prevent carbonization during heating, which can lead to carbon buildup or localized carburization / decarburization; and removing solid impurities such as metal shavings, dust, and scale to prevent affecting heating uniformity or contaminating the furnace.

[0004] In related technologies, cleaning bolts typically involves immersing them sequentially in cleaning tanks containing different cleaning solutions, followed by drying. However, this cleaning process usually requires workers to operate lifting equipment to transfer bolts between different devices. During this transfer, residual cleaning solution on the bolt surface can easily pollute the surrounding environment. Furthermore, the level of mechanization is low, making it difficult to meet the needs of large-scale factory production. Summary of the Invention

[0005] This application provides a bolt heat treatment process that can reduce pollution to the surrounding environment during cleaning, is more environmentally friendly, has a high degree of mechanization, and can meet the needs of mass production in factories.

[0006] The bolt heat treatment process provided in this application adopts the following technical solution: A bolt heat treatment process includes: S1. Automatic feeding: Bolts to be processed are fed into the production line via a magnetic tape feeder. S2. Automatic Cleaning: The magnetic tape feeder feeds the bolts into the cleaning mechanism. The cleaning mechanism sequentially transports the bolts and immerses them in cleaning tanks with different cleaning solutions. Finally, the cleaned bolts are automatically dried to remove surface stains. S3. Controlled atmosphere heating and heat preservation: The cleaned bolts are sent into the quenching furnace and heated and kept at a temperature range of 800-930℃ under the protection of methanol cracking atmosphere. The heat preservation time is controlled at 30-150 minutes. The carbon potential in the furnace is monitored in real time by the oxygen probe and automatically adjusted to the set value by the carbon potential controller. The furnace temperature uniformity is controlled within ±5℃ in the uniform temperature zone. S4. Quenching: The heated bolts are transferred to a quenching oil tank for quenching. The oil temperature in the quenching oil tank is maintained at 65-95℃, and the oil temperature is ensured to be uniform through multi-directional jetting. S5. Degreasing: The quenched bolts are placed on the degreasing rack, and the quenching oil adhering to the surface is removed by the tumbling of the mesh belt and the blowing of the fan. S6. Tempering: The cleaned bolts are sent into a tempering furnace and tempered in a temperature range of 100-750℃. The tempering time is controlled within 50-250 minutes, and the furnace temperature uniformity is controlled within ±5℃. S7. Cooling and Discharge: The tempered bolts are cooled in a cooling tank at 40-55℃ and finally discharged through the discharge mechanism.

[0007] Preferably, the cleaning mechanism includes a machine platform, and the cleaning pools are arranged sequentially inside the machine platform. The cleaning pools are equipped with soaking cages for placing bolts. The machine platform is also equipped with a transfer unit mounted above the cleaning pools, which is used to transfer the soaking cages between the various cleaning pools.

[0008] Preferably, the machine base is provided with a feeding chamber for placing soaking cages, and a feeding bin is rotatably provided on the machine base above the feeding chamber. The feeding chamber is provided with a lifting unit that is linked to the feeding bin, and the soaking cages located in the feeding chamber are placed on the lifting unit. The lifting unit is used to drive the feeding bin to rotate back and forth. A temporary storage cavity for temporarily storing bolts is formed on the feeding bin.

[0009] Preferably, the machine platform is provided with a spin-drying chamber and a conveying unit for sending the soaking cage into the spin-drying chamber; the conveying unit is used to send the soaking cage onto the conveying unit; the spin-drying chamber is provided with a driving component, which is used to drive the soaking cage to rotate and spin-dry.

[0010] Preferably, the machine platform is provided with a spin-drying chamber and a conveying unit for sending the soaking cage into the spin-drying chamber; the conveying unit is used to send the soaking cage onto the conveying unit; the spin-drying chamber is provided with a driving component, which is used to drive the soaking cage to rotate and spin-dry.

[0011] Preferably, the machine platform is provided with a rotary unit mounted above the drying unit. The rotary unit is used to clamp the soaking cage on the tilting and unloading assembly and assist the soaking cage in tilting. The machine platform is provided with a return unit located on one side of the feeding hopper. The rotary unit is used to remove the soaking cage after unloading from the tilting and unloading assembly and place the soaking cage on the return unit. The return unit is used to push the soaking cage into the lifting unit, which is in a lifting state.

[0012] Preferably, the cleaning tank is equipped with a lifting unit, and the soaking cage located in the cleaning tank is placed on the lifting unit; the lifting unit drives the soaking cage to rise and fall.

[0013] Preferably, the tilting unloading assembly includes a fixed plate disposed on the movable end of the conveying unit, a tilting plate rotatably disposed on one side of the fixed plate, and a limiting seat for insertion into the bottom of the soaking cage rotatably disposed on the side wall of the tilting plate away from the fixed plate; a telescopic drive is rotatably disposed at the bottom of the fixed plate, and the movable end of the telescopic drive is rotatably disposed at the bottom of the tilting plate, the telescopic drive being used to drive the tilting plate to tilt.

[0014] Preferably, an external gear ring is provided on the outer wall of the limiting seat, and the driving assembly includes a spin-drying motor fixedly mounted on the spin-drying chamber. A drive gear for meshing with the external gear ring is coaxially mounted on the rotating shaft of the spin-drying motor. When the conveying unit sends the soaking cage into the designated work position of the spin-drying chamber, the external gear ring meshes with the drive gear.

[0015] Preferably, the fixing plate is provided with a baffle, which closes one side opening of the spin-drying chamber when the conveying unit sends the soaking cage into the designated work position of the spin-drying chamber.

[0016] In summary, this application includes at least one of the following beneficial technical effects: By immersing the bolts sequentially in cleaning tanks containing different cleaning solutions, the cleaning effect on the surface dirt and oil stains of the bolts can be ensured. The soaking cage rotates and spins in the spin-drying chamber to accelerate the removal of cleaning fluid from the bolt surface, thereby increasing the subsequent drying rate. It enables automatic recycling and replenishment of empty soaking cages. The entire cycle process is fully mechanically controlled with a high degree of automation. Furthermore, the entire cleaning, spin-drying, and subsequent drying processes are all completed within the machine, reducing pollution to the surrounding environment during cleaning and making it more environmentally friendly. It can meet the needs of large-scale production in factories. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the process flow of an embodiment of this application; Figure 2This is a schematic diagram of the overall structure of the cleaning mechanism in an embodiment of this application; Figure 3 yes Figure 2 A partial structural diagram; Figure 4 This is a schematic diagram highlighting a partial structure of the transfer unit; Figure 5 This is a schematic diagram highlighting a portion of the lifting unit's structure; Figure 6 This is a partial structural diagram highlighting the return unit and the feeding chamber; Figure 7 This is a schematic diagram highlighting a portion of the lifting unit's structure; Figure 8 yes Figure 6 A schematic diagram of the local structure from another perspective; Figure 9 This is a schematic diagram highlighting a portion of the tilting unloading assembly; Figure 10 This is a schematic diagram highlighting a partial structure of the transport unit.

[0018] Explanation of reference numerals in the attached drawings: 1. Cleaning mechanism; 10. Cleaning tank; 11. Soaking cage; 12. Lifting unit; 120. Placement rack; 121. Lifting cylinder; 2. Machine platform; 20. Feeding chamber; 21. Lifting unit; 210. Hydraulic cylinder; 211. Lifting platform; 212. Linkage rod; 22. Returning unit; 220. Returning roller; 221. Returning pneumatic guide rail; 222. Push plate; 3. Transfer unit; 30. Transfer guide rail; 31. 1. Transfer seat; 32. Transfer cylinder; 33. Pneumatic gripper; 4. Feeding bin; 40. Temporary storage chamber; 5. Spin-drying chamber; 50. Drive assembly; 51. Spin-drying motor; 52. Drive gear; 6. Conveying unit; 60. Pneumatic linear guide rail; 7. Drying unit; 8. Tilting unloading assembly; 80. Fixing plate; 81. Tilting plate; 82. Limit seat; 83. Telescopic drive component; 84. External gear ring; 85. Baffle; 9. Rotation unit. Detailed Implementation

[0019] The present application will be further described in detail below with reference to the accompanying drawings.

[0020] This application discloses a bolt heat treatment process.

[0021] Reference Figure 1 , Figure 2 Bolt heat treatment processes include: S1. Automatic feeding: Bolts to be processed are fed into the production line via a magnetic tape feeder. S2. Automatic Cleaning: Bolts are fed into the cleaning mechanism 1 via a magnetic tape feeder for cleaning. Mechanism 1 sequentially transfers the bolts and immerses them in cleaning pools 10 with different cleaning solutions. Finally, the cleaned bolts are automatically dried to remove surface stains. S3. Controlled atmosphere heating and heat preservation: The cleaned bolts are sent into the quenching furnace and heated and kept at a temperature range of 800-930℃ under the protection of methanol cracking atmosphere. The heat preservation time is controlled at 30-150 minutes. The carbon potential in the furnace is monitored in real time by the oxygen probe and automatically adjusted to the set value by the carbon potential controller. The furnace temperature uniformity is controlled within ±5℃ in the uniform temperature zone. S4. Quenching: The heated bolts are transferred to a quenching oil tank for quenching. The oil temperature in the quenching oil tank is maintained at 65-95℃, and the oil temperature is ensured to be uniform through multi-directional jetting. S5. Degreasing: The quenched bolts are placed on the degreasing rack, and the quenching oil adhering to the surface is removed by the tumbling of the mesh belt and the blowing of the fan. S6. Tempering: The cleaned bolts are sent into a tempering furnace and tempered in a temperature range of 100-750℃. The tempering time is controlled within 50-250 minutes, and the furnace temperature uniformity is controlled within ±5℃. S7. Cooling and Discharge: The tempered bolts are cooled in a cooling tank at 40-55℃ and finally discharged through the discharge mechanism.

[0022] like Figure 2 , Figure 3 As shown, the cleaning mechanism 1 includes a machine platform 2, and cleaning pools 10 are arranged sequentially along the length of the machine platform 2, with each cleaning pool 10 being independent of the others. A lifting unit 12 is installed within each cleaning pool 10. The lifting unit 12 includes a placement frame 120 that moves up and down along the height of the cleaning pool 10. A lifting cylinder 121 is fixedly installed on the top of the machine platform 2, corresponding to the lower placement frame 120. The piston rod of the lifting cylinder 121 is fixedly connected to the lower placement frame 120, and the lifting cylinder 121 is used to drive the placement frame 120 to move up and down.

[0023] like Figure 3 , Figure 4 as well as Figure 5As shown, a soaking cage 11 for placing bolts is provided on the placement rack 120. A transfer unit 3, mounted above the cleaning tanks 10, is also provided on the top of the machine base 2. The transfer unit 3 is used to transfer the soaking cage 11 between the various cleaning tanks 10. The transfer unit 3 includes a transfer guide rail 30 horizontally fixed to the top of the machine base 2, the length of which extends along the arrangement direction of the various cleaning tanks 10. A transfer seat 31 is slidably mounted on the transfer guide rail 30 in the horizontal direction. A motor reduction gearbox is fixedly mounted on the transfer seat 31. A traveling gear is coaxially mounted on the output shaft of the motor reduction gearbox. The traveling gear meshes with a rack fixedly mounted on the transfer guide rail 30, the length of which extends along the length direction of the guide rail 30. When the motor reduction gearbox drives the traveling gear to rotate, the interaction between the traveling gear and the rack drives the transfer seat 31 to slide back and forth along the length direction of the guide rail 30.

[0024] like Figure 3 , Figure 4 as well as Figure 5 As shown, the transfer unit 3 also includes a transfer cylinder 32 fixedly mounted on the transfer seat 31. A pneumatic gripper 33 is fixedly mounted on the piston rod of the transfer cylinder 32 to clamp the crossbar fixed on the soaking cage 11. When the transfer seat 31 moves directly above the cleaning tank 10, the lifting cylinder 121 drives the placement rack 120 and the soaking cage 11 to be lifted from the cleaning tank 10 to a specified height. Then, the pneumatic gripper 33 clamps and fixes the crossbar on the soaking cage 11. Next, the transfer seat 31 drives the soaking cage 11 to move above the next cleaning tank 10 and places it on the already lifted placement rack 120. Then, driven by the lifting cylinder 121, the placement rack 120 slowly lowers the soaking cage 11 into the cleaning tank 10 until the cleaning liquid in the cleaning tank 10 completely submerges the bolt.

[0025] like Figure 6 , Figure 7 as well as Figure 8 As shown, the machine base 2 is equipped with a feeding chamber 20 for placing the soaking cage 11. The feeding chamber 20 and the cleaning tank 10 are arranged in the same row, and the guide rail 30 is also mounted above the feeding chamber 20. A feeding bin 4 is rotatably installed on the outer wall of the machine base 2 above the feeding chamber 20. The feeding bin 4 is used to receive the bolts to be processed sent out by the discharge port of the magnetic tape feeder and guide the bolts to be processed to fall into the soaking cage 11 located in the feeding chamber 20, so as to realize the automatic feeding of bolts.

[0026] like Figure 6 , Figure 7 as well as Figure 8As shown, a lifting unit 21, which is linked to the feeding bin 4, is provided inside the feeding chamber 20. The lifting unit 21 includes a hydraulic cylinder 210 fixedly installed at the bottom of the feeding chamber 20, with the piston rod of the hydraulic cylinder 210 arranged vertically upward. A lifting platform 211 located inside the feeding chamber 20 is fixedly installed on the piston rod of the hydraulic cylinder 210. The lifting platform 211 moves up and down along the height direction of the feeding chamber 20 under the drive of the hydraulic cylinder 210. The soaking cage 11 located inside the feeding chamber 20 is placed on the lifting platform 211. A linkage rod 212 is provided between the lifting platform 211 and the feeding bin 4. The linkage rod 212 is symmetrically arranged outside the soaking cage 11. The bottom of the linkage rod 212 is rotatably mounted on the lifting platform 211, and the top of the linkage rod 212 is movably mounted on the feeding bin 4. The linkage rod 212 is used to drive the feeding bin 4 to rotate back and forth.

[0027] When the lifting platform 211 lifts the soaking cage 11 upwards, the linkage rod 212 pushes the feeding bin 4 to rotate away from the loading chamber 20. A temporary storage chamber 40 for storing bolts is formed at the end of the feeding bin 4 away from the loading chamber 20. While the transfer unit 3 removes the soaking cage 11 from the loading chamber 20, the bolts fed from the magnetic tape feeder outlet can be temporarily stored in the temporary storage chamber 40 without stopping the magnetic tape feeder. This ensures the continuity of bolt feeding, guarantees bolt processing efficiency, and meets the needs of mass production in the factory.

[0028] When the empty soaking cage 11 is replenished onto the lifting platform 211, the lifting platform 211 will lower the empty soaking cage 11. At this time, the linkage rod 212 will cause the discharge port of the feeding bin 4 to rotate towards the feeding chamber 20. As the tilt angle of the feeding bin 4 gradually increases, the bolts located in the temporary storage chamber 40 will slide down into the empty soaking cage 11 under their own gravity. The entire feeding process is fully automatic, with a high degree of mechanization. At the same time, it also ensures the continuity of feeding, realizes uninterrupted feeding, and improves processing efficiency.

[0029] like Figure 9 , Figure 10 As shown, the machine base 2 is equipped with a spin-drying chamber 5 and a conveying unit 6 for feeding the soaking cage 11 containing bolts into the spin-drying chamber 5. The conveying unit 6 includes a pneumatic linear guide rail 60 fixedly mounted on the machine base 2. The pneumatic linear guide rail 60 is horizontally arranged, and its length direction is perpendicular to the length direction of the transfer guide rail 30. A tilting unloading assembly 8 is provided on the sliding end of the pneumatic linear guide rail 60. The transfer unit 3 is used to transport the cleaned bolts together with the soaking cage 11 onto the tilting unloading assembly 8.

[0030] like Figure 9 , Figure 10As shown, the tilting unloading assembly 8 includes a fixed plate 80 fixedly mounted on the sliding end of the pneumatic linear guide rail 60. A tilting plate 81 is rotatably mounted on the side wall of the fixed plate 80 facing the feeding direction of the transfer unit 3. The rotation axis of the tilting plate 81 extends along the length of the pneumatic linear guide rail 60. A limiting seat 82 for insertion into the limiting groove of the bottom central axis of the soaking cage 11 is rotatably mounted on the side wall of the tilting plate 81 away from the fixed plate 80. A telescopic drive member 83 is rotatably mounted on the bottom of the fixed plate 80. In this embodiment, the telescopic drive member 83 is a cylinder. The piston rod of the telescopic drive member 83 is rotatably mounted on the bottom of the tilting plate 81, and the telescopic drive member 83 is used to drive the tilting plate 81 to tilt left and right.

[0031] like Figure 9 , Figure 10 As shown, an external gear ring 84 is coaxially fixed on the outer wall of the limiting seat 82, and a drive assembly 50 is fixedly installed inside the spin-drying chamber 5. The drive assembly 50 includes a spin-drying motor 51 fixedly installed inside the spin-drying chamber 5. A drive gear 52 for meshing with the external gear ring 84 is coaxially fixed on the rotating shaft of the spin-drying motor 51. When the movable end of the pneumatic linear guide rail 60 sends the flipping unloading assembly 8 together with the soaking cage 11 into the designated station of the spin-drying chamber 5, the external gear ring 84 will mesh with the drive gear 52. Then the spin-drying motor 51 is started. With the cooperation of the external gear ring 84 and the drive gear 52, the soaking cage 11 is driven to rotate and spin-dry inside the spin-drying chamber 5 to accelerate the discharge of the cleaning liquid from the bolt surface and improve the subsequent drying rate.

[0032] like Figure 9 , Figure 10 As shown, a baffle 85 is fixedly installed on the fixed plate 80. When the conveying unit 6 sends the soaking cage 11 into the designated position of the spin-drying chamber 5, the baffle 85 closes one side opening of the spin-drying chamber 5, thereby effectively preventing the cleaning liquid from splashing everywhere.

[0033] like Figure 8 , Figure 9 , Figure 10As shown, a drying unit 7 is installed on the machine base 2, and the drying unit 7 and the cleaning tank 10 are located on opposite sides of the machine base 2. When the conveying unit 6 moves the soaking cage 11, which has been spun dry, out of the spin-drying chamber 5 to the feed inlet side of the drying unit 7, the telescopic drive component 83 will drive the tilting plate 81 to tilt towards the feed inlet of the drying unit 7. A rotary unit 9 is installed on the machine base 2 above the drying unit 7. The rotary unit 9 and the transfer unit 3 are arranged side by side on opposite sides of the machine base 2, and the structure of the rotary unit 9 is completely the same as that of the transfer unit 3, which will not be described in detail here. The rotary unit 9 is used to clamp the crossbar of the soaking cage 11 on the tilting unloading assembly 8 and assist the soaking cage 11 to tilt towards the feed inlet of the drying unit 7, ensuring that the soaking cage 11 remains stable on the tilting plate 81 during the tilting process, until the bolts inside the soaking cage 11 are emptied into the drying unit 7. The drying unit 7 includes an oven and a conveyor belt that rotates inside the oven.

[0034] like Figure 8 As shown, the machine base 2 is equipped with a return material unit 22 located on one side of the feed bin 4. After the soaking cage 11 completes the bolt tilting process, the piston rod of the telescopic drive component 83 will retract and drive the tilting plate 81 to tilt and reset in the direction away from the feed inlet of the drying unit 7 until the tilting plate 81 tilts to a horizontal state. Then the rotary unit 9 takes the empty soaking cage 11 after unloading from the tilting plate 81 and moves the empty soaking cage 11 to the return material unit 22.

[0035] like Figure 8 As shown, the return unit 22 includes multiple return rollers 220 rotatably mounted on the machine base 2. The return rollers 220 are parallel to each other and arranged sequentially towards the temporary storage chamber 40. The return unit 22 is also equipped with a return pneumatic guide rail 221, the length of which extends along the arrangement direction of the return rollers 220. A push plate 222 is fixedly mounted on the movable end of the return pneumatic guide rail 221. The push plate 222 is used to push the soaking cage 11 placed on the return rollers 220 into the lifting platform 211, which is in a raised state. This achieves automatic recycling and replenishment of the empty soaking cage 11. The entire cycle process is fully mechanically controlled, with a high degree of automation. Furthermore, the entire cleaning, spin-drying, and subsequent drying processes are all completed within the machine base 2, reducing pollution to the surrounding environment during cleaning, making it more environmentally friendly, and meeting the needs of large-scale factory production.

[0036] The implementation principle is as follows: by immersing the bolts sequentially in cleaning pools 10 with different cleaning solutions, the cleaning effect on the surface dirt and oil stains of the bolts can be ensured. The cleaning solution can be an alkaline phosphate-free cleaning agent containing biodegradable surfactants, silicate corrosion inhibitors, etc. Finally, the bolts are rinsed with hot water to remove residual alkaline solution. When the transfer seat 31 moves directly above the cleaning pool 10, the lifting cylinder 121 drives the placement frame 120 and the soaking cage 11 to be lifted from the cleaning pool 10 to the designated height. Then, the pneumatic gripper 33 clamps and fixes the crossbar on the soaking cage 11. Next, the transfer seat 31 drives the soaking cage 11 to move above the next cleaning pool 10 and places the soaking cage 11 on the already lifted placement frame 120. Then, the placement frame 120, driven by the lifting cylinder 121, slowly lowers the soaking cage 11 into the cleaning pool 10 until the cleaning solution in the cleaning pool 10 completely submerges the bolts.

[0037] When the movable end of the pneumatic linear guide 60 sends the tilting unloading assembly 8 along with the soaking cage 11 into the designated station of the spin-drying chamber 5, the external gear ring 84 will mesh with the drive gear 52, and then the spin-drying motor 51 will be started. With the cooperation of the external gear ring 84 and the drive gear 52, the soaking cage 11 will be driven to rotate and spin-dry in the spin-drying chamber 5 to accelerate the discharge of the cleaning liquid from the bolt surface and improve the subsequent drying rate.

[0038] The rotary unit 9 is used to clamp the crossbar of the soaking cage 11 on the flipping unloading assembly 8 and assist the soaking cage 11 to flip towards the feed port of the drying unit 7, ensuring that the soaking cage 11 can remain stable on the flipping plate 81 during the flipping process, until the bolts in the soaking cage 11 are emptied into the drying unit 7.

[0039] A pusher plate 222 is fixedly installed on the movable end of the return pneumatic guide rail 221. The pusher plate 222 is used to push the soaking cage 11 placed on the return roller 220 to move it onto the lifting platform 211, which is in a raised state. This realizes the automatic recycling and replenishment of the empty soaking cage 11. The entire cycle process is fully mechanically controlled, with a high degree of automation. Furthermore, the entire cleaning, spin-drying, and subsequent drying processes are all completed within the machine 2, reducing pollution to the surrounding environment during cleaning, making it more environmentally friendly, and meeting the needs of mass production in factories.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bolt heat treatment process, characterized in that, include: S1. Automatic feeding: Bolts to be processed are fed into the production line via a magnetic tape feeder. S2. Automatic cleaning: The magnetic tape feeder feeds the bolts into the cleaning mechanism (1), the cleaning mechanism (1) transfers the bolts in sequence and soaks them in cleaning pools (10) with different cleaning solutions, and finally automatically dries the bolts after cleaning to remove surface stains. S3. Controlled atmosphere heating and heat preservation: The cleaned bolts are sent into the quenching furnace and heated and kept at a temperature range of 800-930℃ under the protection of methanol cracking atmosphere. The heat preservation time is controlled at 30-150 minutes. The carbon potential in the furnace is monitored in real time by the oxygen probe and automatically adjusted to the set value by the carbon potential controller. The furnace temperature uniformity is controlled within ±5℃ in the uniform temperature zone. S4. Quenching: The heated bolts are transferred to a quenching oil tank for quenching. The oil temperature in the quenching oil tank is maintained at 65-95℃, and the oil temperature is ensured to be uniform through multi-directional jetting. S5. Degreasing: The quenched bolts are placed on the degreasing rack, and the quenching oil adhering to the surface is removed by the tumbling of the mesh belt and the blowing of the fan. S6. Tempering: The cleaned bolts are sent into a tempering furnace and tempered in a temperature range of 100-750℃. The tempering time is controlled within 50-250 minutes, and the furnace temperature uniformity is controlled within ±5℃. S7. Cooling and Discharge: The tempered bolts are cooled in a cooling tank at 40-55℃ and finally discharged through the discharge mechanism.

2. The bolt heat treatment process according to claim 1, characterized in that: The cleaning mechanism (1) includes a machine platform (2), and the cleaning pools (10) are arranged in sequence inside the machine platform (2). The cleaning pools (10) are equipped with soaking cages (11) for placing bolts. The machine platform (2) is also equipped with a transfer unit (3) mounted above the cleaning pools (10). The transfer unit (3) is used to transfer the soaking cages (11) between the various cleaning pools (10).

3. The bolt heat treatment process according to claim 2, characterized in that: The machine base (2) is provided with a feeding chamber (20) for placing the soaking cage (11). The machine base (2) is rotatably provided with a feeding bin (4) located above the feeding chamber (20). The feeding chamber (20) is provided with a lifting unit (21) that is linked with the feeding bin (4). The soaking cage (11) located in the feeding chamber (20) is placed on the lifting unit (21). The lifting unit (21) is used to drive the feeding bin (4) to rotate back and forth. The feeding bin (4) has a temporary storage cavity (40) for temporarily storing bolts.

4. The bolt heat treatment process according to claim 3, characterized in that: The machine (2) is provided with a spin-drying chamber (5) and a conveying unit (6) for sending the soaking cage (11) into the spin-drying chamber (5); the transfer unit (3) is used to send the soaking cage (11) to the conveying unit (6); the spin-drying chamber (5) is provided with a drive assembly (50) for driving the soaking cage (11) to rotate and spin-dry.

5. The bolt heat treatment process according to claim 4, characterized in that: The machine (2) is equipped with a drying unit (7), and the conveying unit (6) is equipped with a flipping unloading assembly (8). The transfer unit (3) is used to transport the soaking cage (11) to the flipping unloading assembly (8). When the conveying unit (6) transports the flipping unloading assembly (8) to one side of the drying unit (7), the flipping unloading assembly (8) drives the soaking cage (11) to flip towards the feed inlet of the drying unit (7) until the bolts in the soaking cage (11) are poured into the drying unit (7).

6. The bolt heat treatment process according to claim 5, characterized in that: The machine (2) is equipped with a rotary unit (9) mounted above the drying unit (7). The rotary unit (9) is used to clamp the soaking cage (11) on the flipping unloading assembly (8) and assist the soaking cage (11) in flipping. The machine (2) is equipped with a return unit (22) located on one side of the feed hopper (4). The rotary unit (9) is used to remove the soaking cage (11) after unloading from the flipping unloading assembly (8) and place the soaking cage (11) on the return unit (22). The return unit (22) is used to push the soaking cage (11) into the lifting unit (21) which is in a lifting state.

7. The bolt heat treatment process according to claim 2, characterized in that: The cleaning pool (10) is equipped with a lifting unit (12), and the soaking cage (11) located in the cleaning pool (10) is placed on the lifting unit (12); the lifting unit (12) drives the soaking cage (11) to rise and fall.

8. The bolt heat treatment process according to claim 5, characterized in that: The overturning unloading assembly (8) includes a fixed plate (80) disposed on the movable end of the conveying unit (6), a flipping plate (81) is rotatably disposed on one side of the fixed plate (80), and a limiting seat (82) for inserting into the bottom of the soaking cage (11) is rotatably disposed on the side wall of the flipping plate (81) away from the fixed plate (80); a telescopic drive member (83) is rotatably disposed at the bottom of the fixed plate (80), and the movable end of the telescopic drive member (83) is rotatably disposed at the bottom of the flipping plate (81), and the telescopic drive member (83) is used to drive the flipping plate (81) to flip.

9. The bolt heat treatment process according to claim 8, characterized in that: An external gear ring (84) is provided on the outer side wall of the limiting seat (82). The drive assembly (50) includes a spin-drying motor (51) fixedly installed on the spin-drying chamber (5). A drive gear (52) for meshing with the external gear ring (84) is coaxially arranged on the rotating shaft of the spin-drying motor (51). When the conveying unit (6) sends the soaking cage (11) into the designated work position of the spin-drying chamber (5), the external gear ring (84) meshes with the drive gear (52).

10. The bolt heat treatment process according to claim 9, characterized in that: A baffle (85) is provided on the fixed plate (80). When the conveying unit (6) sends the soaking cage (11) into the designated work position of the spin-drying chamber (5), the baffle (85) closes one side opening of the spin-drying chamber (5).

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