Heat treatment method applied to third-generation high-precision ball hub unit outer ring

Abstract

The invention relates to the technical field of hub unit machining, in particular to a heat treatment method applied to a third-generation high-precision ball hub unit outer ring, and the heat treatment method comprises the following steps: detection: conveying a to-be-treated hub unit workpiece to a detection mechanism through a first conveying belt, and detecting and judging the hub unit workpiece through the detection mechanism; if the detection is not passed, the first robot clamps the unqualified hub unit workpiece to a second conveying belt and conveys the unqualified hub unit workpiece to a maintenance position for reworking; through automatic detection, processing and transmission processes, the error rate of manual operation is reduced, it is ensured that each workpiece is subjected to the same processing step, and therefore the quality and consistency of products are improved; the medium-frequency induction heater and the accurately controlled quenching medium water temperature are used, so that the heating and cooling processes can be accurately controlled, and the performance of the material can meet the design requirements; and an automatic troubleshooting mechanism improves the production efficiency and reduces the rejection rate at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of wheel hub unit processing, and in particular to a heat treatment method for the outer ring of a third generation high-precision ball wheel hub unit. Background Art

[0002] With the development of the manufacturing industry, the demand for high-precision and high-performance parts is growing. Especially in the fields of automobiles, aerospace, etc., the quality requirements for parts are extremely strict. Traditional heat treatment methods often rely on manual operation, which is not only inefficient, but also easily leads to unstable product quality due to human factors. In addition, traditional cooling methods cannot meet the needs of modern industry for fast and uniform cooling, which directly affects the performance and service life of materials. Therefore, it is particularly important to develop an efficient and automated heat treatment method.

[0003] A Chinese patent discloses a surface heat treatment method for a wheel hub unit, publication number: (CN 109055704A), comprising the following steps: S1, installation: placing the wheel hub unit components into a medium frequency induction heater; S2, parameter setting: using a medium frequency heating method, wherein the rim adopts 8000 Hz, the hardened layer depth is 1.3-2.5 mm; the spoke and bead seat adopt 2500 Hz, the hardened layer depth is 2.4-4.1 mm, the heating temperature is 900-950°C, and the hardness of the hardened layer is HRC58-64; S3, quenching: energizing the medium frequency induction heater, using the induced current generated by the components under the action of the high-frequency magnetic field and the action of the magnetic field in the conductor to cause self-heating to reach the heating temperature, but the surface heat treatment method and cooling method of this wheel hub unit cannot meet the modern industry's demand for rapid and uniform cooling, which directly affects the performance and service life of the material, is inefficient, and is prone to unstable product quality due to human factors. Therefore, a heat treatment method and a method of use for the outer ring of a third-generation high-precision ball wheel hub unit are needed. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the surface heat treatment method and cooling method of the hub unit cannot meet the needs of modern industry for rapid and uniform cooling, which directly affects the performance and service life of the material, is inefficient, and is easily prone to unstable product quality due to human factors. A heat treatment method and use method for the outer ring of the third-generation high-precision ball hub unit are proposed.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a heat treatment method applied to the outer ring of the third generation high-precision ball hub unit, characterized in that: the heat treatment method is:

[0006] Inspection: The hub unit workpiece to be processed is conveyed from the first conveyor belt to the inspection mechanism, which inspects and determines the hub unit workpiece. If the inspection fails, the first robot clamps the unqualified hub unit workpiece to the second conveyor belt and sends it to the maintenance department for rework;

[0007] Heating: The hub unit workpiece to be processed is conveyed to the edge by the first conveyor belt, and the second robot puts the hub unit workpiece to be processed into the third conveyor belt and conveys it to the medium frequency induction heating furnace, where it is heated by the medium frequency induction heater and solution treated in the temperature range of 525-535°C. The holding time is about 0.5-1 hour.

[0008] Quenching: After solution treatment, the workpiece is quickly transferred to the quenching furnace and passed through the quenching medium water. The temperature of the quenching medium is usually controlled at 50-60℃, and the residence time is 8-10 minutes;

[0009] Cooling: The quenched hub unit workpiece is transported to the cooling device through the fourth conveyor belt, and is gradually cooled in multiple layers according to its metal material and heat treatment method through the cold cutting device. After cooling, it is placed in the box by the first robot, and then the workpiece after natural aging is placed at a temperature of 130-155℃ for artificial aging treatment, and the insulation time is 50-65 minutes to eliminate residual stress; through the automated detection, processing and transmission process, the error rate of manual operation is reduced, and the quality and consistency of the product are improved. Precise control of the heating and cooling process ensures that the performance of the material meets the design requirements. Automated troubleshooting mechanisms (such as automatic rework of defective products) improve production efficiency and reduce scrap rates.

[0010] Preferably, the cooling device includes a cooling box body, a working area is provided at the center of the cooling box body, the working area is associated with and matched with the width of the fourth conveyor belt, the top of the cooling box body is a hollow structure and a coolant component is provided inside, heat dissipation ports are provided on both sides of the top of the cooling box body, an air cooling component is provided on the inner wall of the working area, and a hollow structure is provided below the working area and a dust collection component is provided inside. Through the integrated coolant component and air cooling component, effective cooling of the workpiece is achieved and material performance problems caused by uneven temperature are avoided. The design of the heat dissipation port helps to quickly dissipate heat, maintain the stability of the equipment and extend its service life. The use of the dust collection component reduces dust pollution in the working environment and improves working conditions.

[0011] Preferably, the coolant assembly includes a coolant storage tank, a cover plate is provided on the top of the coolant storage tank, a liquid inlet is provided on the top of the coolant storage tank, a mounting frame is provided below the coolant storage tank, the top of the working area of ​​the mounting frame is matched, and atomizing nozzles are provided at the bottom of the mounting frame. The number of the atomizing nozzles is 10 to 20 and they are arranged in an evenly spaced array. The evenly spaced array arrangement of the atomizing nozzles ensures that the coolant can evenly cover the entire workpiece surface, thereby improving the cooling efficiency and enhancing the versatility of the equipment.

[0012] Preferably, the air cooling component includes a top fan and a side fan, the top fan is arranged concentrically and coaxially with the mounting frame, the side fan is associated with the inner wall of the working area, the number of the side fans is 2 and they are arranged accordingly, one end of the side fan is connected to a servo motor, a motor fixing bracket is installed on the outside of the servo motor, one side of the motor fixing bracket is associated with the cooling box body, the combined use of the top fan and the side fan provides an all-round cooling effect, ensuring that all parts of the workpiece can be adequately cooled, and the application of the servo motor allows the fan speed to be precisely controlled, so that the cooling intensity can be adjusted as needed.

[0013] Preferably, the side fan is provided with a protective filter cover facing the working area. The design of the protective filter cover not only protects the fan from damage by external foreign objects, but also prevents dust and other contaminants from entering the cooling system, thereby ensuring the cleanliness and efficiency of the cooling process.

[0014] Preferably, the dust suction component includes a waste storage box, a box door is provided on one side of the waste storage box, a dust suction pipe is provided on the top of the waste storage box, a dust suction pump is connected to the top of the dust suction pipe, and dust suction ports are connected to both sides of the dust suction pump. The number of the dust suction ports is 3 to 5 and they are arranged corresponding to each other. The design of the dust suction component effectively collects the waste generated during the processing process and keeps the working environment clean. The configuration of multiple dust suction ports improves the dust suction efficiency and ensures that the waste is completely removed.

[0015] Preferably, a parameter display screen is provided on one side of the cooling box body, an adjustment knob is provided below the parameter display screen, and a control switch is provided on one side of the adjustment knob. The design of the parameter display screen and the adjustment knob allows the operator to intuitively monitor and adjust various parameters of the cooling process, thereby improving the convenience and accuracy of operation. The setting of the control switch facilitates quick cutting off of the power supply of the equipment in an emergency, thereby increasing safety.

[0016] Preferably, the detection mechanism includes a detection box body, the top of the detection box body is a hollow structure and a data processing unit is arranged inside, a connecting frame is arranged on one side of the detection box body, a detector is arranged on one end of the connecting frame, and a data display screen is arranged on one side of the detection box body. The integrated data processing unit and data display screen enable the detection results to be directly displayed, which facilitates the operator to judge the product quality. The use of the detector improves the accuracy and efficiency of the detection.

[0017] Preferably, the first conveyor belt, the second conveyor belt, the third conveyor belt and the fourth conveyor belt all include a support frame, a conveyor belt is provided on the top of the support frame, a belt transmission member is provided on one side of the support frame, and a drive motor is provided on one side of the belt transmission member. The unified conveyor belt design simplifies the layout and maintenance of the production line, and the use of the drive motor ensures the stability and reliability of the conveyor belt operation.

[0018] Preferably, the first robot and the second robot both include a base, a mechanical transmission arm is provided above the base, a section of the mechanical transmission arm is connected to a workpiece magnetic suction port, and the design of the mechanical transmission arm and the workpiece magnetic suction port enables the robot to flexibly grasp and move the workpiece, thereby improving the degree of automation. The use of the magnetic suction port ensures the safety and stability of the workpiece during the handling process.

[0019] The present invention is beneficial in that:

[0020] This application reduces the error rate of manual operations through automated detection, processing and transmission processes, ensures that each workpiece undergoes the same processing steps, and thus improves product quality and consistency; the use of medium-frequency induction heaters and precisely controlled quenching medium water temperature can accurately control the heating and cooling processes to ensure that the material performance meets the design requirements; automated troubleshooting mechanisms (such as automatic rework of defective products) improve production efficiency while reducing scrap rates; the use of dust collection components reduces dust pollution in the working environment, improves working conditions, and is beneficial to employee health; the design of the parameter display and adjustment knob allows the operator to intuitively monitor and adjust the various parameters of the cooling process, improving the convenience and accuracy of operation; in an emergency, the control switch can quickly cut off the power supply to the equipment, increasing safety; the design of the mechanical transmission arm and the workpiece magnetic suction port enables the robot to flexibly grasp and move workpieces, improving the degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0023] Figure 2 For the embodiment of the present invention Figure 1 A is an enlarged view of the middle image.

[0024] Figure 3 It is a schematic diagram of the structure of a cooling device according to an embodiment of the present invention.

[0025] Figure 4 Schematic diagram of the internal structure of the cooling device according to an embodiment of the present invention.

[0026] Figure 5 This is a schematic structural diagram of the cooling device according to an embodiment of the present invention from another perspective.

[0027] Figure 6 Schematic diagram of the detection mechanism structure of an embodiment of the present invention.

[0028] Figure 7 Schematic diagram of the internal structure of the detection mechanism according to an embodiment of the present invention.

[0029] In the figure: 1, quenching furnace; 2, medium frequency induction heating furnace; 3, third conveyor belt; 4, first robot; 5, detection mechanism; 6, first conveyor belt; 7, second conveyor belt; 8, mechanical transmission arm; 9, second robot; 10, base; 11, cooling device; 12, fourth conveyor belt; 13, workpiece magnetic suction port; 15, driving motor; 16, belt transmission member; 17, supporting frame; 18, cover plate; 19, box door; 20, cooling box body; 21, heat dissipation port; 22, atomizing nozzle; 23 , protective filter cover; 24, side fan; 25, dust pump; 26, dust pipe; 27, waste storage box; 28, mounting frame; 29, top fan; 30, coolant storage box; 31, liquid inlet; 33, servo motor; 34, motor fixing bracket; 35, dust inlet; 36, working area; 37, parameter display screen; 38, adjustment knob; 39, control switch; 40, connecting frame; 41, detector; 42, data display screen; 43, detection box body; 44, data processing unit; DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example

[0032] See also Figure 1-7 As shown:

[0033] Embodiment: A heat treatment method for the outer ring of a third generation high-precision ball hub unit, characterized in that: the heat treatment method is:

[0034] Inspection: The hub unit workpiece to be processed is conveyed by the first conveyor belt 6 to the inspection mechanism 5. The inspection mechanism 5 inspects and determines the hub unit workpiece. If the inspection fails, the first robot 4 clamps the unqualified hub unit workpiece to the second conveyor belt 7 and sends it to the maintenance place for rework;

[0035] Heating: The hub unit workpiece to be processed is conveyed to the edge by the first conveyor belt 6, and the second robot 9 puts the hub unit workpiece to be processed into the third conveyor belt 3 and conveys it to the medium frequency induction heating furnace quenching furnace; 2, it is heated by the medium frequency induction heater, and the solution treatment is carried out in the temperature range of 525-535℃, and the holding time is about 0.5-1 hour;

[0036] Quenching: After solution treatment, the workpiece is quickly transferred to the quenching furnace and passed through the quenching medium water. The temperature of the quenching medium is usually controlled at 50-60℃, and the residence time is 8-10 minutes;

[0037] Cooling: The quenched hub unit workpiece is transported to the cooling device 11 through the fourth conveyor belt 12, and is gradually cooled in multiple layers according to its metal material and heat treatment method by the cold cutting device. After cooling, it is placed in the box by the first robot 4, and then the workpiece after natural aging is placed at a temperature of 130-155°C for artificial aging treatment, and the insulation time is 50-65 minutes to eliminate residual stress; through the automated detection, processing and transmission process, the error rate of manual operation is reduced, and the quality and consistency of the product are improved. Precise control of the heating and cooling process ensures that the performance of the material meets the design requirements. Automated troubleshooting mechanisms (such as automatic rework of defective products) improve production efficiency and reduce scrap rates.

[0038] In this embodiment, the cooling device 11 includes a cooling box body 20, a working area 36 is provided in the center of the cooling box body 20, and the working area 36 is associated with and matched with the width of the fourth conveyor belt 12. The top of the cooling box body 20 is a hollow structure and a coolant component is provided inside. Heat dissipation ports 21 are provided on both sides of the top of the cooling box body 20. An air cooling component is provided on the inner wall of the working area 36. The bottom of the working area 36 is a hollow structure and a dust collection component is provided inside. Through the integrated coolant component and air cooling component, effective cooling of the workpiece is achieved and material performance problems caused by uneven temperature are avoided. The design of the heat dissipation port 21 helps to quickly dissipate heat, maintain the stability of the equipment and extend its service life. The use of the dust collection component reduces dust pollution in the working environment and improves working conditions.

[0039] In this embodiment, the coolant assembly includes a coolant storage tank 30, a cover plate 18 is provided on the top of the coolant storage tank 30, a liquid inlet 31 is provided on the top of the coolant storage tank 30, a mounting frame 28 is provided below the coolant storage tank 30, the mounting frame 28 is matched with the top of the working area 36, ​​and an atomizing nozzle 22 is provided at the bottom of the mounting frame 28. The number of the atomizing nozzles 22 is 10 to 20 and they are arranged in an evenly spaced array. The evenly spaced array arrangement of the atomizing nozzles 22 ensures that the coolant can evenly cover the entire workpiece surface, thereby improving the cooling efficiency and enhancing the versatility of the equipment.

[0040] In this embodiment, the air cooling component includes a top fan 29 and a side fan 24, both of which are industrial fans and are common products on the market and can be purchased directly. The top fan 29 is arranged concentrically and coaxially with the mounting frame 28, and the side fan 24 is associated with the inner wall of the working area 36. The number of the side fans 24 is 2 and they are arranged accordingly. One end of the side fan 24 is connected to a servo motor 33, and the servo motor 33 is a common product on the market and can be purchased directly. A motor fixing bracket 34 is installed on the outside of the servo motor 33, and one side of the motor fixing bracket 34 is associated with the cooling box body 20. The combined use of the top fan 29 and the side fan 24 provides an all-round cooling effect, ensuring that all parts of the workpiece can be fully cooled. The application of the servo motor 33 allows the fan speed to be precisely controlled, so that the cooling intensity can be adjusted as needed.

[0041] In this embodiment, the side fan 24 is provided with a protective filter cover 23 facing the working area 36. The design of the protective filter cover 23 not only protects the fan from damage by external foreign objects, but also prevents dust and other pollutants from entering the cooling system, thereby ensuring the cleanliness and efficiency of the cooling process.

[0042] In this embodiment, the dust collection component includes a waste storage box 27, a box door 19 is provided on one side of the waste storage box 27, a dust collection pipe 26 is provided on the top of the waste storage box 27, a dust collection pump 25 is connected to the top of the dust collection pipe 26, and dust collection ports 35 are connected to both sides of the dust collection pump 25. The number of the dust collection ports 35 is 3 to 5 and they are arranged corresponding to each other. The design of the dust collection component effectively collects the waste generated during the processing process and keeps the working environment clean. The configuration of multiple dust collection ports 35 improves the dust collection efficiency and ensures that the waste is completely removed.

[0043] In this embodiment, a parameter display screen 37 is provided on one side of the cooling box body 20, an adjustment knob 38 is provided below the parameter display screen 37, and a control switch 39 is provided on one side of the adjustment knob 38. The design of the parameter display screen 37 and the adjustment knob 38 allows the operator to intuitively monitor and adjust various parameters of the cooling process, thereby improving the convenience and accuracy of operation. The setting of the control switch 39 facilitates quick cutting off of the power supply of the equipment in an emergency, thereby increasing safety.

[0044] In this embodiment, the detection mechanism 5 includes a detection box body 43, the top of the detection box body 43 is a hollow structure and a data processing unit 44 is provided inside, one side of the detection box body 43 is connected to a frame 40, one end of the connection frame 40 is provided with a detector 41, and one side of the detection box body 43 is provided with a data display screen 42. The integrated data processing unit 44 and the data display screen 42 allow the detection results to be directly displayed, which facilitates the operator's judgment of the product quality. The use of the detector 41 improves the accuracy and efficiency of the detection.

[0045] In this embodiment, it is characterized in that: the first conveyor belt 6, the second conveyor belt 7, the third conveyor belt 3 and the fourth conveyor belt 12 all include a support frame 17, a conveyor belt is provided on the top of the support frame 17, a belt transmission member 16 is provided on one side of the support frame 17, and a drive motor 15 is provided on one side of the belt transmission member 16. The drive motor 15 is a common product on the market and can be purchased directly. The unified conveyor belt design simplifies the layout and maintenance of the production line. The use of the drive motor 15 ensures the stability and reliability of the conveyor belt operation.

[0046] In this embodiment, the first robot 4 and the second robot 9 both include a base 10, and a mechanical transmission arm 8 is provided above the base 10. A section of the mechanical transmission arm 8 is connected to a workpiece magnetic suction port 13. The design of the mechanical transmission arm 8 and the workpiece magnetic suction port 13 enables the robots to flexibly grasp and move the workpiece, thereby improving the degree of automation. The use of the magnetic suction port ensures the safety and stability of the workpiece during the handling process.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a combined manner.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A heat treatment method for the outer ring of a third generation high-precision ball hub unit, characterized in that: The heat treatment method is: Inspection: The hub unit workpiece to be processed is conveyed from the first conveyor belt (6) to the inspection mechanism (5), and the inspection mechanism (5) inspects and determines the hub unit workpiece. If the inspection fails, the first robot (4) clamps the unqualified hub unit workpiece to the second conveyor belt (7) and sends it to the maintenance department for rework; Heating: The hub unit workpiece to be processed is conveyed to the edge by the first conveyor belt (6), and the second robot (9) puts the hub unit workpiece to be processed into the third conveyor belt (3), and conveys it to the medium frequency induction heating furnace (quenching furnace; 2), and is heated by the medium frequency induction heater, and solution treatment is performed in the temperature range of 525-535° C., and the holding time is about 0.5-1 hour; Quenching: After solution treatment, the workpiece is quickly transferred to the quenching furnace and passed through the quenching medium water. The temperature of the quenching medium is usually controlled at 50-60℃, and the residence time is 8-10 minutes; Cooling: The quenched hub unit workpiece is transported to the cooling device (11) via the fourth conveyor belt (12), and is gradually cooled in multiple layers by the cold cutting device according to its metal material and heat treatment method. After cooling, it is placed in a box by the first robot (4), and then the workpiece after natural aging is placed at a temperature of 130-155°C for artificial aging treatment, with a heat preservation time of 50-65 minutes to eliminate residual stress.

2. A heat treatment method for the outer ring of a third generation high-precision ball hub unit according to claim 1, characterized in that: The cooling device (11) comprises a cooling box body (20), a working area (36) is provided at the center of the cooling box body (20), the working area (36) is associated with and matched with the width of the fourth conveyor belt (12), the top of the cooling box body (20) is a hollow structure and a coolant component is provided inside, heat dissipation ports (21) are provided on both sides of the top of the cooling box body (20), an air cooling component is provided on the inner wall of the working area (36), and the bottom of the working area (36) is a hollow structure and a dust collection component is provided inside.

3. A heat treatment method for the outer ring of a third generation high-precision ball hub unit according to claim 2, characterized in that: The coolant assembly comprises a coolant storage tank (30), a cover plate (18) is provided on the top of the coolant storage tank (30), a liquid inlet (31) is provided on the top of the coolant storage tank (30), a mounting frame (28) is provided below the coolant storage tank (30), the top of the mounting frame (28) and the working area (36) are matched, and an atomizing nozzle (22) is provided at the bottom of the mounting frame (28), and the number of the atomizing nozzles (22) is 10 to 20 and they are arranged in an array with equal spacing.

4. A heat treatment method for the outer ring of a third generation high-precision ball hub unit according to claim 3, characterized in that: The air cooling component comprises a top fan (29) and a side fan (24); the top fan (29) is arranged concentrically and coaxially with the mounting frame (28); the side fan (24) is associated with the inner wall of the working area (36); the number of the side fans (24) is two and they are arranged correspondingly; one end of the side fan (24) is connected to a servo motor (33); a motor fixing frame (34) is installed on the outer side of the servo motor (33); one side of the motor fixing frame (34) is associated with the cooling box body (20).

5. A heat treatment method for the outer ring of a third generation high-precision ball hub unit according to claim 4, characterized in that: The side fan (24) is provided with a protective filter screen cover (23) facing the working area (36).

6. A heat treatment method for the outer ring of a third generation high-precision ball hub unit according to claim 2, characterized in that: The dust collection assembly comprises a waste storage box (27), a box door (19) is provided on one side of the waste storage box (27), a dust collection pipe (26) is provided on the top of the waste storage box (27), a dust collection pump (25) is connected to the top of the dust collection pipe (26), and dust collection ports (35) are connected to both sides of the dust collection pump (25), and the number of the dust collection ports (35) is 3 to 5 and they are arranged corresponding to each other.

7. A heat treatment method for the outer ring of a third generation high-precision ball hub unit according to claim 2, characterized in that: A parameter display screen (37) is provided on one side of the cooling box body (20), an adjustment knob (38) is provided below the parameter display screen (37), and a control switch (39) is provided on one side of the adjustment knob (38).

8. The heat treatment method for the outer ring of the third generation high-precision ball hub unit according to claim 1 is characterized in that: The detection mechanism (5) comprises a detection box body (43), the top of the detection box body (43) is a hollow structure and a data processing unit (44) is arranged inside, one side of the detection box body (43) is connected to a connecting frame (40), one end of the connecting frame (40) is provided with a detector (41), and one side of the detection box body (43) is provided with a data display screen (42).

9. The heat treatment method for the outer ring of the third generation high-precision ball hub unit according to claim 1, characterized in that: The first conveyor belt (6), the second conveyor belt (7), the third conveyor belt (3) and the fourth conveyor belt (12) all comprise a support frame (17), a conveying belt is provided on the top of the support frame (17), a belt transmission member (16) is provided on one side of the support frame (17), and a driving motor (15) is provided on one side of the belt transmission member (16).

10. The heat treatment method for the outer ring of the third generation high-precision ball hub unit according to claim 1, characterized in that: The first robot (4) and the second robot The robot (9) comprises a base (10), and a mechanical transmission arm (8) is arranged above the base (10). One section of the mechanical transmission arm (8) is connected to a workpiece magnetic suction port (13).

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