A surface strengthening process and apparatus for automobile wheel hubs

Abstract

This invention discloses a surface strengthening process and apparatus for automobile wheel hubs, relating to the field of automobile wheel hub surface strengthening technology. The surface strengthening process includes the following steps: S1: Adding reflective material, stainless steel particles, thermally conductive particles, and water-based polyurethane to a stirring device and stirring to obtain a first spraying liquid; S2: Adding thermally conductive particles, color-changing material, and water-based polyurethane to a second stirring device and stirring to obtain a second spraying liquid; S3: Spraying the first spraying liquid onto half of the top surface of the aluminum alloy automobile wheel hub; S4: Subsequently, using the automobile wheel hub surface strengthening apparatus, spraying the second spraying liquid onto the surface of the aluminum alloy automobile wheel hub. This invention, by incorporating reflective pigments into the first spraying liquid, allows it to reflect red and silver-white light in a nighttime environment when sprayed onto the automobile wheel hub, thus forming a strong warning color of alternating red and silver-white, making it easier for people to see the automobile wheel hub at night and increasing safety during nighttime driving.

Description

Technical Field

[0001] This invention relates to the field of automotive wheel hub surface strengthening technology, specifically to an automotive wheel hub surface strengthening process and apparatus. Background Technology

[0002] Car wheels are generally made of aluminum alloy. To prevent corrosion, a reinforcing material is usually sprayed onto the surface of the wheel rim to protect the aluminum alloy from damage. As the side of the car, the wheel rim is usually silver-white. At night, some dark-colored cars are not easily visible to the naked eye. By setting warning colors on the wheel rim, specific colors of light can be reflected, allowing people to quickly identify objects in front and avoid them. At the same time, the wheel rim needs to have good heat dissipation performance, as the heat generated by the brake disc needs to be quickly dissipated through the wheel rim. Therefore, the wheel rim needs to have good heat dissipation, and it should not accumulate a lot of dust.

[0003] The existing defects in car wheel hubs are: Existing technology WO2022109993A1 discloses a process for preparing a high-hardness, corrosion-resistant wheel hub coating. This technology includes the following steps: preparing AlxFeNiSiTi high-entropy alloy powder; mixing the AlxFeNiSiTi high-entropy alloy powder with stainless steel shot peening in a specific ratio, heating the mixture to a predetermined temperature after homogeneity; and using an inert gas to blast the AlxFeNiSiTi high-entropy alloy powder and stainless steel shot peening onto the wheel hub surface. As the nozzle moves, the AlxFeNiSiTi high-entropy alloy powder is uniformly adhered to the wheel hub surface to form a coating. This process allows the coating material to adhere better to the wheel hub surface, improving its adhesion and density. It can also repair some surface defects on the wheel hub. Furthermore, the Al content in the AlxFeNiSiTi high-entropy alloy can be adjusted to modify its hardness and corrosion resistance for different wheel hubs and usage conditions.

[0004] The aforementioned technologies do not address the issue of setting warning colors on the surface of car wheel rims, and therefore cannot provide a strong warning to people at night by reflecting warning light. Ordinary aluminum alloy is silver-white, and a single-color metal has poor effect. Therefore, a surface strengthening process for car wheel rims that can provide a strong color warning to people at night is needed to solve this problem. Summary of the Invention

[0005] One objective of this application is to provide a process and apparatus for strengthening the surface of automobile wheel hubs, which can solve the technical problems mentioned in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a surface strengthening process for automobile wheel hubs, the surface strengthening process for automobile wheel hubs comprising the following steps: S1: Add reflective material, stainless steel particles, thermally conductive particles and water-based polyurethane into the mixing device and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid one is obtained. S2: Add the thermally conductive particles, color-changing material and water-based polyurethane into the stirring device two and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid two is obtained. S3: Using the automotive wheel hub surface strengthening processing device, spray liquid is applied to half of the top surface of the aluminum alloy automotive wheel hub after cleaning and epoxy primer treatment to form coating layer one. The other half of the top surface of the aluminum alloy automotive wheel hub does not need to be sprayed. Then, the aluminum alloy automotive wheel hub is left to stand at 50 degrees Celsius for 15 minutes to wait for surface drying. S4: Then, the coating liquid II is sprayed onto the surface of the aluminum alloy car wheel using the car wheel surface strengthening processing device to form coating layer II. The aluminum alloy car wheel is then left to stand at 50 degrees Celsius for 15 minutes to allow it to dry.

[0007] Preferably, the reflective material in S1 is a red pigment.

[0008] Preferably, the thermally conductive particles in S1 and S2 are diamond particles with an average particle size of 25-50 μm.

[0009] Preferably, the color-changing material in S2 is spiropyran powder.

[0010] Preferably, the spray liquid in S1 comprises, by weight, 10-15 parts reflective material, 20-30 parts stainless steel particles, 15-20 parts thermally conductive particles, and 120-150 parts waterborne polyurethane.

[0011] Preferably, the spray liquid in S2 comprises, by weight, 20-30 parts of thermally conductive particles, 20-30 parts of color-changing material, and 120-150 parts of waterborne polyurethane.

[0012] Preferably, the device includes a frame, a housing, and a hopper. The housing is mounted on the top of the frame, and two hoppers are mounted on the top of the housing. A controller is mounted on the right side of the housing.

[0013] Preferably, multiple support pillars are symmetrically installed at the bottom of the frame, multiple rotating rollers are movably installed through the inner side of the frame, a motor is installed on the right side of the frame, and the output end of the motor is connected to one end of the rotating roller. The motor is electrically connected to the controller, and two conveyor chains are symmetrically installed on the outer side of the rotating roller. Multiple support rods are installed on the inner side of the two conveyor chains.

[0014] Preferably, multiple heating lamps are installed on the top of the housing, and the heating lamps are electrically connected to the controller. Multiple infrared thermometers are installed through the two sides of the housing, and the infrared thermometers are electrically connected to the controller.

[0015] Preferably, the front output end of the material box is equipped with multiple solenoid valves, which are electrically connected to the controller. Multiple impurity pumps are installed on the top of the housing, and the impurity pumps are electrically connected to the controller. The input end of the impurity pump is connected to the output end of the solenoid valve. The output end of the impurity pump is equipped with a pipe, and the output end of the pipe is equipped with a nozzle.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention incorporates reflective pigments into the spraying liquid, which, when sprayed onto car wheel rims, reflects red and silver-white light in a nighttime environment, thus creating a strong warning color scheme of alternating red and silver-white. This makes it easier for people to observe car wheel rims at night, increasing safety while driving at night.

[0017] 2. By setting a second coating layer on the outside of the first coating layer, the present invention can effectively reduce the loss rate of reflective pigment in the first coating layer, thereby extending the lifespan of the first coating layer reflecting red light. At the same time, the polyurethane in the first and second coating layers solidifies to form a polyurethane layer. The polyurethane layer does not easily attract dust, and the dust falls off more easily. Therefore, it is not easy for dust to accumulate on the car wheel hub, thus ensuring that the car wheel hub has good heat dissipation capacity.

[0018] 3. By incorporating thermally conductive diamond particles into the first and second coating layers, this invention can significantly increase the speed at which the wheel hub dissipates heat outward. This allows the wheel hub to cool down promptly during frequent braking, preventing the brake disc's performance from deteriorating due to slow wheel hub cooling.

[0019] 4. This invention incorporates spiropyran powder, a color-changing material, into the second spray coating layer. This spiropyran powder changes from colorless to purple under daytime ultraviolet light irradiation, thereby absorbing some ultraviolet rays and reflecting some ultraviolet rays. Furthermore, diamond particles have excellent ultraviolet reflection capabilities. Therefore, this invention can effectively reduce the damage of ultraviolet rays to the waterborne polyurethane in the first and second spray coating layers under sunlight, and slow down the aging rate of the polyurethane. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the structure at point A in the diagram; Figure 3 This is a front sectional view of the frame and housing of the present invention; Figure 4 This is a process flow diagram of the present invention.

[0021] In the diagram: 1. Frame; 2. Support column; 3. Rotating roller; 4. Motor; 5. Conveyor chain; 6. Support rod; 7. Housing; 8. Controller; 9. Heat lamp; 10. Infrared thermometer; 11. Material bin; 12. Solenoid valve; 13. Impurity pump; 14. Pipe; 15. Nozzle. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 A process and apparatus for surface strengthening of automobile wheel hubs, the process comprising the following steps: S1: Add reflective material, stainless steel particles, thermally conductive particles and water-based polyurethane into the mixing device and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid one is obtained. S2: Add the thermally conductive particles, color-changing material and water-based polyurethane into the stirring device two and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid two is obtained. S3: Using the automotive wheel hub surface strengthening processing device, spray liquid is applied to half of the top surface of the aluminum alloy automotive wheel hub after cleaning and epoxy primer treatment to form coating layer one. The other half of the top surface of the aluminum alloy automotive wheel hub does not need to be sprayed. Then, the aluminum alloy automotive wheel hub is left to stand at 50 degrees Celsius for 15 minutes to wait for surface drying. S4: Then, the coating liquid II is sprayed onto the surface of the aluminum alloy car wheel using the car wheel surface strengthening processing device to form coating layer II. The aluminum alloy car wheel is then left to stand at 50 degrees Celsius for 15 minutes to allow it to dry.

[0026] The reflective material in S1 is red pigment, which can reflect red light at night, thus creating a red warning for people and making it easier for them to know that there are obstacles ahead. In addition, half of the aluminum alloy car wheel is red and the other half is the original metallic color. The alternating reflection of the original metallic color and red can give people a stronger reflective warning.

[0027] The heat-conducting particles in S1 and S2 are diamond particles with an average particle size of 25-50 μm. Using diamond particles as heat-conducting particles has stronger thermal conductivity. The diamond particles in the first coating layer can quickly transfer the heat of the aluminum alloy car wheel to the outer coating layer two. The diamond particles in the second coating layer can quickly transfer the heat from the first coating layer to the surface of the second coating layer and then dissipate the heat into the air, thereby achieving rapid heat dissipation of the aluminum alloy car wheel.

[0028] The color-changing material in S2 is spiropyran powder. Spiropyran powder is colorless and transparent at night, so spray coating one and the aluminum alloy car wheel hub can be seen through spray coating two. When exposed to sunlight during the day, ultraviolet radiation will cause the spiropyran powder to turn purplish-red, dark purple, or bluish-purple. These colors can reflect some of the ultraviolet rays, thereby reducing the damage of ultraviolet rays to polyurethane, slowing down the aging rate of polyurethane, and extending the life of spray coating one and spray coating two.

[0029] The spray liquid in S1 comprises, by weight, 10-15 parts reflective material, 20-30 parts stainless steel particles, 15-20 parts thermally conductive particles, and 120-150 parts waterborne polyurethane, with ultraviolet absorbers added to the waterborne polyurethane.

[0030] The spraying liquid in S2 comprises, by weight, 20-30 parts of thermally conductive particles, 20-30 parts of color-changing material, and 120-150 parts of waterborne polyurethane, with ultraviolet absorbers added to the waterborne polyurethane.

[0031] A surface strengthening processing device for automobile wheel hubs includes a frame 1, a housing 7, and material bins 11. The housing 7 is installed on the top of the frame 1, and two material bins 11 are installed on the top of the housing 7. A controller 8 is installed on the right side of the housing 7. The frame 1 provides a mounting position for the housing 7, the motor 4, and the rotating roller 3. The housing 7 provides space for coating spraying and drying of aluminum alloy automobile wheel hubs, and also provides a mounting position for the material bins 11. The front material bin 11 is used to store spraying liquid one, and the rear material bin 11 is used to store spraying liquid two.

[0032] Multiple support pillars 2 are symmetrically installed at the bottom of the frame 1. Multiple rotating rollers 3 are movably installed through the inner side of the frame 1. A motor 4 is installed on the right side of the frame 1, and the output end of the motor 4 is connected to one end of the rotating roller 3. The motor 4 is electrically connected to the controller 8. Two conveyor chains 5 are symmetrically installed on the outer side of the rotating roller 3. Multiple support rods 6 are installed on the inner side of the two conveyor chains 5. The support pillars 2 provide support for the frame 1. The controller 8 controls the operation of the motor 4. The operation of the motor 4 drives the rotating roller 3 to rotate, which in turn drives the conveyor chains 5 to move backward. The backward movement of the conveyor chains 5 drives the support rods 6 to move backward. The support rods 6 are used to provide a placement position for the aluminum alloy car wheel hub. After the aluminum alloy car wheel hub is placed on the support rods 6, the support rods 6 move backward, driving the aluminum alloy car wheel hub to move backward, so that the aluminum alloy car wheel hub can be sprayed with spray liquid one and spray liquid two in sequence, and at the same time, it can be dried.

[0033] Multiple heating lamps 9 are installed on the top of the housing 7. The heating lamps 9 are electrically connected to the controller 8. Multiple infrared thermometers 10 are installed through both sides of the housing 7. The infrared thermometers 10 are also electrically connected to the controller 8. The heating lamps 9 convert electrical energy into heat energy to dry the first and second spray coatings on the aluminum alloy car wheel hub, thereby accelerating the drying speed of the first and second spray coatings. The infrared thermometers 10 detect the temperature of the aluminum alloy car wheel hub. When the temperature of the aluminum alloy car wheel hub rises to the set value, the controller 8 controls the heating lamps 9 to stop working.

[0034] Multiple solenoid valves 12 are installed on the front output end of the material tank 11. The solenoid valves 12 are electrically connected to the controller 8. Multiple impurity pumps 13 are installed on the top of the housing 7. The impurity pumps 13 are electrically connected to the controller 8. The input end of the impurity pump 13 is connected to the output end of the solenoid valve 12. A pipe body 14 is installed on the output end of the impurity pump 13. A nozzle 15 is installed on the output end of the pipe body 14. The front material tank 11 stores spraying liquid one, and the rear material tank 11 stores spraying liquid two. After the solenoid valve 12 and the impurity pump 13 are opened, the impurity pump 13 delivers the liquid in the material tank 11 into the pipe body 14. Then the liquid in the pipe body 14 enters the nozzle 15, thereby realizing the spraying of aluminum alloy car wheel hubs. The front nozzle 15 sprays the aluminum alloy car wheel hubs with spraying liquid one, and the rear nozzle 15 sprays the aluminum alloy car wheel hubs with spraying liquid two.

[0035] Working principle: The car wheel hub is placed on the support rod 6, and then the support rod 6 moves the car wheel hub backward. First, the front nozzle 15 sprays the aluminum alloy car wheel hub with spraying liquid one. Then, the aluminum alloy car wheel hub is left to stand at 50 degrees Celsius for 15 minutes to wait for surface drying. Then, the car wheel hub moves backward to below the rear nozzle 15, and the rear nozzle 15 sprays the aluminum alloy car wheel hub with spraying liquid two.

[0036] Example 1, please refer to Figure 4 A surface strengthening process for automotive wheel hubs: 1. Add 12 parts of reflective red pigment, 25 parts of stainless steel particles, 17 parts of thermally conductive diamond particles and 140 parts of water-based polyurethane into the mixing device and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid 1 is obtained. 2. Add 25 parts of thermally conductive diamond particles, 25 parts of color-changing material spiropyran powder and 140 parts of water-based polyurethane into the mixing device 2 and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid 2 is obtained. 3. Using the automotive wheel hub surface strengthening processing device, spray the first coating liquid onto half of the top surface of the aluminum alloy automotive wheel hub after it has been cleaned and treated with epoxy primer, forming the first coating layer. The other half of the top surface of the aluminum alloy automotive wheel hub does not need to be sprayed. Then, let the aluminum alloy automotive wheel hub stand at 50 degrees Celsius for 15 minutes to wait for the surface to dry. Fourth, the coating liquid II is then sprayed onto the surface of the aluminum alloy car wheel using the car wheel surface strengthening processing device to form coating layer II. The aluminum alloy car wheel is then left to stand at 50 degrees Celsius for 15 minutes to allow it to dry.

[0037] Example 2, please refer to Figure 4 A surface strengthening process for automotive wheel hubs: 1. Add 25 parts of stainless steel particles, 17 parts of thermally conductive diamond particles and 140 parts of water-based polyurethane into the mixing device and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid 1 is obtained. 2. Add 25 parts of thermally conductive diamond particles, 25 parts of color-changing material spiropyran powder and 140 parts of water-based polyurethane into the mixing device 2 and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid 2 is obtained. 3. Using the automotive wheel hub surface strengthening processing device, spray the first coating liquid onto half of the top surface of the aluminum alloy automotive wheel hub to form the first coating layer. The other half of the top surface of the aluminum alloy automotive wheel hub does not need to be sprayed. Then, let the aluminum alloy automotive wheel hub stand at 50 degrees Celsius for 15 minutes to wait for the surface to dry. Fourth, the coating liquid II is then sprayed onto the surface of the aluminum alloy car wheel using the car wheel surface strengthening processing device to form coating layer II. The aluminum alloy car wheel is then left to stand at 50 degrees Celsius for 15 minutes to allow it to dry.

[0038] Example 3, please refer to Figure 4 A surface strengthening process for automotive wheel hubs: 1. Add 12 parts of reflective red pigment, 25 parts of stainless steel granules and 140 parts of water-based polyurethane into the mixing device and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid 1 is obtained. 2. Add 25 parts of thermally conductive diamond particles, 25 parts of color-changing material spiropyran powder and 140 parts of water-based polyurethane into the mixing device 2 and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid 2 is obtained. 3. Using the automotive wheel hub surface strengthening processing device, spray the first coating liquid onto half of the top surface of the aluminum alloy automotive wheel hub to form the first coating layer. The other half of the top surface of the aluminum alloy automotive wheel hub does not need to be sprayed. Then, let the aluminum alloy automotive wheel hub stand at 50 degrees Celsius for 15 minutes to wait for the surface to dry. Fourth, the coating liquid II is then sprayed onto the surface of the aluminum alloy car wheel using the car wheel surface strengthening processing device to form coating layer II. The aluminum alloy car wheel is then left to stand at 50 degrees Celsius for 15 minutes to allow it to dry.

[0039] Example 4, please refer to Figure 4 A surface strengthening process for automotive wheel hubs: 1. Add 12 parts of reflective red pigment, 25 parts of stainless steel particles, 17 parts of thermally conductive diamond particles and 140 parts of water-based polyurethane into the mixing device and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid 1 is obtained. 2. Add 25 parts of the color-changing material spiropyran powder and 140 parts of water-based polyurethane into the mixing device 2 and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid 2 is obtained. 3. Using the automotive wheel hub surface strengthening processing device, spray the first coating liquid onto half of the top surface of the aluminum alloy automotive wheel hub to form the first coating layer. The other half of the top surface of the aluminum alloy automotive wheel hub does not need to be sprayed. Then, let the aluminum alloy automotive wheel hub stand at 50 degrees Celsius for 15 minutes to wait for the surface to dry. Fourth, the coating liquid II is then sprayed onto the surface of the aluminum alloy car wheel using the car wheel surface strengthening processing device to form coating layer II. The aluminum alloy car wheel is then left to stand at 50 degrees Celsius for 15 minutes to allow it to dry.

[0040] Example 5, please refer to Figure 4 A surface strengthening process for automotive wheel hubs: 1. Add 12 parts of reflective red pigment, 25 parts of stainless steel particles, 17 parts of thermally conductive diamond particles and 140 parts of water-based polyurethane into the mixing device and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid 1 is obtained. 2. Add 25 parts of thermally conductive diamond particles and 140 parts of water-based polyurethane into the mixing device 2 and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid 2 is obtained. 3. Using the automotive wheel hub surface strengthening processing device, spray the first coating liquid onto half of the top surface of the aluminum alloy automotive wheel hub to form the first coating layer. The other half of the top surface of the aluminum alloy automotive wheel hub does not need to be sprayed. Then, let the aluminum alloy automotive wheel hub stand at 50 degrees Celsius for 15 minutes to wait for the surface to dry. Fourth, the coating liquid II is then sprayed onto the surface of the aluminum alloy car wheel using the car wheel surface strengthening processing device to form coating layer II. The aluminum alloy car wheel is then left to stand at 50 degrees Celsius for 15 minutes to allow it to dry.

[0041] Example 6, please refer to Figure 4 A surface strengthening process for automotive wheel hubs: 1. Add 12 parts of reflective red pigment, 25 parts of stainless steel particles, 17 parts of thermally conductive diamond particles and 140 parts of water-based polyurethane into the mixing device and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid 1 is obtained. 2. Using the automotive wheel hub surface strengthening processing device, spray the first coating liquid onto half of the top surface of the aluminum alloy automotive wheel hub to form the first coating layer. The other half of the top surface of the aluminum alloy automotive wheel hub does not need to be sprayed. Then, let the aluminum alloy automotive wheel hub stand at 50 degrees Celsius for 15 minutes to wait for surface drying.

[0042] Performance testing: 1. Reflective performance test: In a 20℃ environment, in a dark environment, the products of each embodiment are placed on the substrate at the same time, and then each product is simultaneously irradiated with white light. The color of each product is observed and recorded as color record one. 2. Heat dissipation performance: In a 20°C environment, the products of each embodiment are placed on the substrate at the same time, and then the inner wall of the car wheel hub is heated to 50°C from the inside of the car wheel hub. Then the heating is stopped, and the temperature of the surface with the sprayed liquid on the outer surface of the car wheel hub is measured after 1 minute. 3. Color change performance test: In a 20℃ environment, the products of each embodiment were placed on the substrate at the same time, and then each product was irradiated with a UV lamp at the same time. After 10 minutes, the UV lamp was turned off and the color of each product was observed and recorded as color record two.

[0043] Test data of each embodiment under the same test conditions

[0044] Experimental data shows that this invention, by incorporating reflective pigments into the first spray coating, allows the car wheel hub to reflect red and silver-white light in a nighttime environment, creating a strong warning color scheme of alternating red and silver-white. This makes the wheel hub more easily visible at night, increasing driving safety. The second spray coating, applied to the outside of the first coating layer, effectively reduces the rate of pigment loss, extending the lifespan of the red light reflected by the first coating layer. The inclusion of thermally conductive diamond particles in both coating layers significantly increases the rate of heat dissipation from the wheel hub, allowing for timely cooling during frequent braking and preventing a decline in braking performance caused by slow wheel hub cooling. Furthermore, the inclusion of spiropyran powder, a color-changing material, in the second spray coating layer changes from colorless to purple under daytime ultraviolet radiation, absorbing and reflecting some ultraviolet light. The diamond particles also possess excellent ultraviolet reflection capabilities, effectively reducing the damage to the waterborne polyurethane in both coating layers under sunlight and slowing down the aging process of the polyurethane.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the rights involved.

Claims

1. A surface strengthening process for automobile wheel hubs, characterized in that: The surface strengthening process for automobile wheel hubs includes the following steps: S1: Add reflective material, stainless steel particles, thermally conductive particles and water-based polyurethane into the mixing device and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid one is obtained. S2: Add the thermally conductive particles, color-changing material and water-based polyurethane into the stirring device two and stir for 10 minutes at a speed of 30 revolutions per minute. After stirring, spray liquid two is obtained. S3: Using the automotive wheel hub surface strengthening processing device, spray liquid is applied to half of the top surface of the aluminum alloy automotive wheel hub after cleaning and epoxy primer treatment to form coating layer one. The other half of the top surface of the aluminum alloy automotive wheel hub does not need to be sprayed. Then, the aluminum alloy automotive wheel hub is left to stand at 50 degrees Celsius for 15 minutes to wait for surface drying. S4: Then, the coating liquid II is sprayed onto the surface of the aluminum alloy car wheel using the car wheel surface strengthening processing device to form coating layer II. The aluminum alloy car wheel is then left to stand at 50 degrees Celsius for 15 minutes to allow it to dry.

2. The surface strengthening process for automobile wheel hubs according to claim 1, characterized in that: The reflective material in S1 is a red pigment.

3. The surface strengthening process for automobile wheel hubs according to claim 1, characterized in that: The thermally conductive particles in S1 and S2 are diamond particles with an average particle size of 25-50 μm.

4. The surface strengthening process for automobile wheel hubs according to claim 1, characterized in that: The color-changing material in S2 is spiropyran powder.

5. The surface strengthening process for automobile wheel hubs according to claim 1, characterized in that: The spraying liquid in S1 comprises, by weight, 10-15 parts reflective material, 20-30 parts stainless steel particles, 15-20 parts thermally conductive particles, and 120-150 parts waterborne polyurethane.

6. The surface strengthening process for automobile wheel hubs according to claim 1, characterized in that: The spray liquid in S2 comprises, by weight, 20-30 parts of thermally conductive particles, 20-30 parts of color-changing material, and 120-150 parts of waterborne polyurethane.

7. A surface strengthening processing apparatus for automobile wheel hubs, applicable to the surface strengthening processing technology for automobile wheel hubs as described in claim 1, characterized in that: It includes a frame (1), a housing (7) and a hopper (11). The housing (7) is installed on the top of the frame (1), and two hoppers (11) are installed on the top of the housing (7). A controller (8) is installed on the right side of the housing (7).

8. The automotive wheel hub surface strengthening processing device according to claim 7, characterized in that: Multiple support columns (2) are symmetrically installed at the bottom of the frame (1). Multiple rotating rollers (3) are movably installed through the inner side of the frame (1). A motor (4) is installed on the right side of the frame (1), and the output end of the motor (4) is connected to one end of the rotating roller (3). The motor (4) is electrically connected to the controller (8). Two conveyor chains (5) are symmetrically installed on the outer side of the rotating roller (3). Multiple support rods (6) are installed on the inner side of the two conveyor chains (5).

9. The automotive wheel hub surface strengthening processing device according to claim 7, characterized in that: Multiple heating lamps (9) are installed on the top of the housing (7). The heating lamps (9) are electrically connected to the controller (8). Multiple infrared thermometers (10) are installed through both sides of the housing (7). The infrared thermometers (10) are electrically connected to the controller (8).

10. The automotive wheel hub surface strengthening processing device according to claim 7, characterized in that: Multiple solenoid valves (12) are installed on the front output end of the material box (11). The solenoid valves (12) are electrically connected to the controller (8). Multiple impurity pumps (13) are installed on the top of the housing (7). The impurity pumps (13) are electrically connected to the controller (8). The input end of the impurity pumps (13) is connected to the output end of the solenoid valves (12). The output end of the impurity pumps (13) is equipped with a pipe body (14). The output end of the pipe body (14) is equipped with a nozzle (15).

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