A method of preparing a light alloy wheel hub end face with an impact-resistant wear-resistant coating

Abstract

The application relates to the field of coating processing, in particular to a light alloy hub end face preparation method with an impact-resistant wear-resistant coating, which comprises the following steps: 1) mixing and powdering of wear-resistant coating raw materials; 2) placing the powder in step 1) into a cold spraying powder feeder, and preparing a coating by using a cold spraying device; 3) heat treating the obtained coating; 4) processing the coating obtained in step 3) into a cylindrical shape with a threaded side face; 5) processing a circle of grooves on the side face of the threaded cylindrical coating obtained in step 4); 6) processing a threaded hole on the position of the hub end face where the impact-resistant wear-resistant coating is needed, and processing a circle of grooves on the side face of the threaded hole; 7) fixing the obtained threaded coating into the threaded hole obtained in step 6); 8) injecting a metal repair agent into the gap between the coating and the threaded hole until the grooves are filled; and 9) room temperature curing the hub with the wear-resistant coating obtained in step 8). The coating prepared by the method has high bonding strength with the hub and long service life.

Description

Technical Field

[0001] This application relates to the field of coating processing, and in particular to a method for preparing the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating. Background Technology

[0002] Road wheels are crucial load-bearing components of tracked vehicles. The use of lightweight materials, such as aluminum / magnesium alloys, can improve the weight reduction of road wheels, decrease unsprung mass, and enhance vehicle handling performance. While aluminum / magnesium alloy road wheels possess advantages such as low density, high specific strength, and good shock absorption, their wear resistance and corrosion resistance are poor, making them unable to withstand impact wear from external environments such as steel idler wheel teeth and sand particles. Applying a wear-resistant coating directly to their surface is an effective way to extend service life; however, in actual vehicle operation, coating peeling is prone to occur, leading to coating failure. Summary of the Invention

[0003] The purpose of this application is to provide a method for preparing a coating with high bonding strength and impact and wear resistance. This solves the problems of low bonding strength, thin thickness, and insufficient impact and wear resistance of current protective coatings on wheel hub end faces.

[0004] To achieve the above objectives, this application provides a method for preparing the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating.

[0005] Includes the following steps:

[0006] 1) Mix the wear-resistant coating raw material powder;

[0007] 2) The mixed powder from step 1) is placed into a cold spray powder feeder, and a coating is prepared using a cold spray equipment controlled by a robotic arm.

[0008] 3) The coating obtained in step 2) is subjected to heat treatment to eliminate internal stress in the coating;

[0009] 4) The coating obtained in step 3) is processed into a cylindrical shape with threads on the side;

[0010] 5) A groove is machined around the side of the threaded cylindrical coating obtained in step 4);

[0011] 6) Drill threaded holes at the locations on the wheel hub end face where an impact-resistant and wear-resistant coating is required, and machine a groove around the side of the threaded holes.

[0012] 7) Place the threaded cylindrical coating obtained in step 5) into the threaded hole obtained in step 6) and fix it in place;

[0013] 8) Inject the metal repair compound into the gap between the coating and the threaded hole until the groove is filled;

[0014] 9) Cure the wear-resistant coating obtained in step 8) at room temperature. After curing, process the coating and the end face of the wheel hub to the same height.

[0015] In some embodiments of this application, the raw materials for the wear-resistant coating are SUS316 powder and tungsten carbide powder.

[0016] In some embodiments of this application, the SUS316 powder and tungsten carbide powder used for spraying in step 1) are spherical in shape.

[0017] In some embodiments of this application, the SUS316 powder has a particle size of 15-45 μm. The tungsten carbide powder has a particle size of 15-45 μm.

[0018] In some embodiments of this application, in step 1), a mixture of SUS316 powder and tungsten carbide powder is sprayed, wherein the content of tungsten carbide powder is 5%-10%.

[0019] In some embodiments of this application, the mixing time of SUS316 powder and tungsten carbide in step 1) is 60 min to 180 min.

[0020] In some embodiments of this application, different spraying powders are used in step 1) to prepare wear-resistant coatings with different material compositions. Different wear-resistant coatings are installed according to the different locations required by the wheel hub to adaptively adjust the wear resistance of different locations.

[0021] In some embodiments of this application, the coating thickness after spraying in step 2) is ≥8mm, and the coating porosity is ≤2%.

[0022] In some embodiments of this application, the heat treatment temperature in step 3) is 130℃-160℃, the holding time is 2-4h, and the furnace is cooled to room temperature after the holding time is completed.

[0023] In some embodiments of this application, there are multiple threaded holes and threaded cylindrical coatings, evenly distributed on the outer periphery of the hub end face.

[0024] In some embodiments of this application, the diameter of the cylindrical coating in step 4) is 10-14 mm, the thread pitch is 1.0-1.5 mm, and the thread depth is 0.5-0.8 mm, so as to ensure the strength of the wheel hub while ensuring the adhesion of the coating.

[0025] In some embodiments of this application, the groove in step 5) is located 2-4 mm from the end of the coating, the groove width is 2-3 mm, and the depth is 2-3 mm. This setting can better ensure the strength of the coating and the bonding force with the wheel hub.

[0026] In some embodiments of this application, step 6) the thread hole specification should match the thread of the coating to ensure that the coating can be firmly fixed in the substrate.

[0027] In some embodiments of this application, the groove on the side of the threaded hole is located 2-4 mm from the bottom of the threaded hole, the groove width is 2-3 mm, and the depth is 2-3 mm.

[0028] In some embodiments of this application, the metal repair agent in step 8) is an aluminum repair agent.

[0029] In some embodiments of this application, the room temperature curing time for step 9) is 24-48 hours.

[0030] In some other embodiments of this application, a light alloy wheel hub end face prepared by the above-described preparation method is also provided.

[0031] In some further embodiments of this application, a road wheel including the aforementioned light alloy hub end face is also provided.

[0032] In some embodiments of this application, the prepared hub end face is installed into a road wheel to obtain a road wheel with excellent impact resistance and wear resistance.

[0033] Compared with the prior art, the advantages of this application are:

[0034] The preparation method of this application overcomes the shortcomings of traditional coatings, such as weak adhesion between the coating and the wheel hub, poor impact resistance, and easy detachment of the wear-resistant coating after it is applied to the wheel hub. The impact-resistant and wear-resistant coating prepared by this application has high bonding strength. The bonding between the coating and the substrate is increased by fastening with multiple threads. Furthermore, by creating grooves in the coating and the substrate and injecting metal repair agent, the cured metal repair agent enhances the connection between the coating and the substrate. This effectively reduces the possibility of coating peeling off during actual use of the wheel hub. Moreover, the coating can be applied to specific locations on the wheel hub according to actual working conditions, or different coatings can be applied to different locations, which is convenient for operation. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the threaded hole on the end face of the wheel hub in some embodiments of this application;

[0037] Figure 2This is a schematic diagram of the coating cross-section in some embodiments of this application;

[0038] Figure 3 This is a schematic diagram of the cross-section of the cured metal repair agent coating in some embodiments of this application;

[0039] Figure 4 This is a photograph of the end face of a lightweight alloy wheel hub with an impact-resistant and wear-resistant coating, as shown in some embodiments of this application. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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 application.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal conduction of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0046] In some embodiments of this application, a method for preparing the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating is provided, comprising the following steps:

[0047] 1) Select SUS316 powder and tungsten carbide powder with a particle size of 15-45μm as the spraying powder, with the content of tungsten carbide powder being 5%; mix the two powders and load them into the powder mixer, with a mixing time of 60min.

[0048] 2) A thick coating with a porosity of 1.5% was prepared using a cold spraying equipment controlled by a robotic arm.

[0049] 3) The prepared thick coating is placed in a heat treatment furnace for heat treatment at a temperature of 150°C for 3 hours. After heat treatment, it is cooled to room temperature with the furnace.

[0050] 4) The thick coating from step 3) is processed into a cylindrical shape with threads on the side. The diameter of the cylindrical coating is 12mm, the thread pitch is 1.5mm, and the thread depth is 0.6mm.

[0051] 5) A groove is machined around the side of the threaded cylindrical coating obtained in step 4). The groove is located 3mm from the end of the coating, and has a width of 3mm and a depth of 3mm.

[0052] 6) Drill threaded holes on the wheel hub end face where the impact-resistant and wear-resistant coating needs to be applied. The thread specifications of the threaded holes should be consistent with the threads of the coating to ensure that the coating is fixed in the substrate. Also, machine a groove around the side of the threaded hole. The groove on the side of the threaded hole should be 3mm from the bottom of the threaded hole, with a groove width of 3mm and a depth of 3mm.

[0053] 7) Place the threaded coating obtained in step 5) into the threaded hole obtained in step 6) and fix it.

[0054] 8) Inject the metal repair agent into the gap between the coating and the threaded hole until the groove is filled.

[0055] 9) The wheel hub with wear-resistant coating obtained in step 8) is cured at room temperature for 36 hours. After curing, the coating and the end face of the wheel hub are machined to the same height.

[0056] In some embodiments of this application, a method for preparing the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating is provided, comprising the following steps:

[0057] 1) SUS316 powder and tungsten carbide powder were selected as the coating powders, with the tungsten carbide powder content being 10%. Both coating powders were spherical with a particle size of 15-45 μm. The two powders were mixed and loaded into a powder mixer, with a mixing time of 60 min.

[0058] 2) A thick coating with a porosity of 2% was prepared using a cold spraying equipment controlled by a robotic arm.

[0059] 3) The prepared thick coating is placed in a heat treatment furnace for heat treatment at a temperature of 170°C for 2 hours. After heat treatment, the coating is cooled to room temperature with the furnace.

[0060] 4) The thick coating from step 3) is processed into a cylindrical shape with threads on the side. The diameter of the cylindrical coating is 14mm, the thread pitch is 1.0mm, and the thread depth is 0.8mm.

[0061] 5) A groove is machined around the side of the threaded cylindrical coating obtained in step 4). The groove is located 2mm from the end of the coating, and has a width and depth of 2mm.

[0062] 6) Drill threaded holes on the wheel hub end face where the impact-resistant and wear-resistant coating needs to be applied. The thread specifications of the threaded holes should match the threads of the coating to ensure that the coating can be fixed in the substrate. Also, machine a groove around the side of the threaded hole. The groove should be 2mm from the bottom of the threaded hole, 2mm wide, and 2mm deep.

[0063] 7) Place the threaded coating obtained in step 5) into the threaded hole obtained in step 6) and fix it.

[0064] 8) Inject the metal repair agent into the gap between the coating and the threaded hole until the groove is filled.

[0065] 9) The wheel hub with wear-resistant coating obtained in step 8) is cured at room temperature for 30 hours. After curing, the coating and the end face of the wheel hub are machined to the same height.

[0066] In some embodiments of this application, the prepared hub end face is installed into a road wheel to obtain a road wheel with excellent impact resistance and wear resistance.

[0067] This application overcomes the shortcomings of traditional coatings, such as weak adhesion between the coating and the wheel hub, poor impact resistance, and easy detachment of the wear-resistant coating after it is applied to the wheel hub. The impact-resistant and wear-resistant coating prepared by this application has high bonding strength. The bonding between the coating and the substrate is increased by fastening with multiple threads. Furthermore, by injecting metal repair agent into grooves on the coating and the substrate, the cured metal repair agent enhances the connection between the coating and the substrate, which can effectively reduce the possibility of coating peeling off during actual use. Moreover, the coating can be applied to specific locations on the wheel hub according to actual working conditions, or different coatings can be applied to different locations, which is convenient for operation.

[0068] The light alloy wheel hub end face prepared by the method of this application has good wear resistance and long service life, and its shear bonding strength is more than 1.5 times that of the existing bonding methods. The metal repair agent fills the groove, which greatly enhances the bonding force between the coating and the substrate. This application can also prepare wear-resistant coatings with different material compositions by selecting different spraying powders. Different wear-resistant coatings can be installed according to the different requirements of the wheel hub to adaptively adjust the wear resistance of different positions.

[0069] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for preparing the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating, characterized in that, Includes the following steps: (1) Mix the wear-resistant coating raw material powder; (2) The mixed powder from step 1) is placed into a cold spray powder feeder and a coating is prepared using a cold spray equipment controlled by a robotic arm. (3) The coating obtained in step 2) is subjected to heat treatment to eliminate internal stress in the coating; (4) The coating obtained in step 3) is processed into a cylindrical shape with threads on the side; (5) A groove is machined around the side of the threaded cylindrical coating obtained in step 4); (6) Drill threaded holes at the locations on the wheel hub end face where an impact-resistant and wear-resistant coating is required, and machine a groove around the side of the threaded holes. (7) Place the threaded cylindrical coating obtained in step 5) into the threaded hole obtained in step 6) and fix it; (8) Inject the metal repair agent into the gap between the coating and the threaded hole until the groove is filled; (9) The wheel hub with wear-resistant coating obtained in step 8) is cured at room temperature. After curing, the coating and the end face of the wheel hub are machined to the same height.

2. The method for preparing the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating according to claim 1, characterized in that, The raw materials for the wear-resistant coating are SUS316 powder and tungsten carbide powder; the SUS316 powder and tungsten carbide powder used for spraying in step 1) are spherical; the particle size of SUS316 powder is 15-45μm; the particle size of tungsten carbide powder is 15-45μm.

3. The method for preparing the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating according to claim 1, characterized in that, In step 1), the spraying powder is a mixture of SUS316 powder and tungsten carbide powder, wherein the content of tungsten carbide powder is 5%-10%; the mixing time of SUS316 powder and tungsten carbide powder in step 1) is 60min-180min.

4. The method for preparing the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating according to claim 1, characterized in that, In step 1), different wear-resistant coatings with different material compositions are prepared by using different spray powders. Different wear-resistant coatings are installed according to the different locations required by the wheel hub, and the wear resistance of different locations is adjusted.

5. The method for preparing the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating according to claim 1, characterized in that, In step 2), the coating thickness after spraying is ≥8mm and the coating porosity is ≤2%; in step 3), the heat treatment temperature is 130℃-160℃ and the holding time is 2-4h. After the holding time is completed, the coating is cooled to room temperature in the furnace.

6. The method for preparing the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating according to claim 1, characterized in that, The threaded holes and threaded cylindrical coatings are multiple and evenly distributed on the outer periphery of the hub end face.

7. The method for preparing the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating according to claim 1, characterized in that, In step 4), the diameter of the cylindrical coating is 10-14mm, the thread pitch is 1.0-1.5mm, and the thread depth is 0.5-0.8mm, ensuring the strength of the wheel hub while guaranteeing the adhesion of the coating.

8. The method for preparing the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating according to claim 1, characterized in that, In step 5), the groove is located 2-4 mm from the end of the coating, with a width of 2-3 mm and a depth of 2-3 mm, which can better ensure the strength of the coating and its bonding force with the wheel hub; in step 6), the threaded hole specification should match the thread of the coating to ensure that the coating can be firmly fixed in the substrate; the groove on the side of the threaded hole is located 2-4 mm from the bottom of the threaded hole, with a width of 2-3 mm and a depth of 2-3 mm; in step 8), the metal repair agent is an aluminum repair agent; in step 9), the room temperature curing time is 24-48 hours.

9. A lightweight alloy wheel hub end face, characterized in that, It is prepared by any one of the preparation methods described in claims 1-8.

10. A road wheel, characterized in that, Includes the light alloy wheel hub end face as described in claim 9.

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