Preparation method of light alloy hub end face with impact-resistant and wear-resistant coating

Abstract

The invention relates to the field of coating processing, in particular to a preparation method of a light alloy hub end face with an impact-resistant and wear-resistant coating, which comprises the following steps: 1) preparing wear-resistant coating raw material mixed powder; and (2) the powder in the step (1) is put into a cold spraying powder feeder, and a coating is prepared through cold spraying equipment. And 3) carrying out heat treatment on the obtained coating. And (4) the coating obtained in the step (3) is machined into a cylinder with threads on the side face. And (5) a circle of groove is machined in the side face of the cylindrical coating with the threads obtained in the step (4). And (6) a threaded hole is punched in the position, needing to be provided with the impact-resistant and wear-resistant coating, of the end face of the hub, and a circle of groove is machined in the side face of the threaded hole. And (7) the obtained coating with the threads is put into the threaded hole obtained in the step (6) to be fixed. And (8) a metal repairing agent is injected into a gap between the coating and the threaded hole until the groove is filled with the metal repairing agent. And (9) the hub with the wear-resistant coating obtained in the step (8) is subjected to room-temperature curing. The coating prepared through the method is high in bonding strength with the hub and long in service life.

Description

Technical Field

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

[0002] The road wheels are important load-bearing parts of tracked vehicles. The use of lightweight materials such as aluminum alloy / magnesium alloy can improve the lightweight degree of the road wheels, reduce the unsprung mass of the vehicle, and improve the driving performance of the vehicle. Although aluminum alloy / magnesium alloy road wheels have the advantages of low density, high specific strength, and good shock absorption, they have poor wear resistance and corrosion resistance and cannot withstand the impact and wear from the external environment such as steel induction wheel teeth and sand and gravel particles. The method of directly preparing a wear-resistant coating on its surface is an effective method to increase the service life. However, in the actual running process, the coating is prone to peeling, resulting in coating failure. Summary of the invention

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

[0004] In order to achieve the above objectives, the present application provides a method for preparing a light alloy wheel hub end surface with an impact-resistant and wear-resistant coating.

[0005] The following steps are involved:

[0006] 1) Mixing the wear-resistant coating raw material powders;

[0007] 2) placing the mixed powder obtained in step 1) into a cold spray powder feeder, and preparing a coating using a cold spray device controlled by a robotic arm;

[0008] 3) heat treating the coating obtained in step 2) to eliminate internal stress of the coating;

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

[0010] 5) machining a circle of grooves on the side of the threaded cylindrical coating obtained in step 4);

[0011] 6) Drill threaded holes at the locations where impact-resistant and wear-resistant coatings are required on the end faces of the hubs, and make a circle of grooves on the sides of the threaded holes;

[0012] 7) placing the threaded cylindrical coating obtained in step 5) into the threaded hole obtained in step 6) and fixing it;

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

[0014] 9) The wheel hub with the wear-resistant coating obtained in step 8) is cured at room temperature, and after the curing is completed, the coating and the end face of the wheel hub are processed to the same height.

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

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

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

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

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

[0020] In some embodiments of the present application, different spray powders are prepared in step 1) to prepare wear-resistant coatings composed of different materials. Different wear-resistant coatings are installed according to different required positions of the wheel hub to adaptively adjust the wear resistance of different positions.

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

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

[0023] In some embodiments of the present application, the threaded holes and the threaded cylindrical coating are multiple and evenly arranged on the outer circumference of the hub end face.

[0024] In some embodiments of the present application, in step 4), the diameter of the cylindrical coating 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 hub while ensuring the bonding strength of the coating.

[0025] In some embodiments of the present application, the position of the groove in step 5) is 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 the present application, the threaded hole specifications in step 6) should match the threads of the coating to ensure that the coating can be firmly fixed in the substrate.

[0027] In some embodiments of the present 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 the present application, the metal repair agent in step 8) is an aluminum repair agent.

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

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

[0031] In some further embodiments of the present application, a road wheel comprising the above-mentioned light alloy hub end face is also provided.

[0032] In some embodiments of the present application, the prepared hub end face is installed in 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 the present application overcomes the shortcomings of traditional coatings such as weak bonding between the coating and the wheel hub, lack of impact resistance, and the problem that the entire wear-resistant coating is easily detached after being bonded to the wheel hub. The impact-resistant and wear-resistant coating prepared by the present application has high bonding strength, and the bonding between the coating and the substrate is increased by multiple threaded fastening methods. In addition, grooves are opened on the coating and the substrate to inject metal repair agent, and the cured metal repair agent strengthens the connection between the coating and the substrate, which can effectively reduce the possibility of coating peeling during actual use of the wheel hub. The coating can be applied at specific positions of the wheel hub according to actual working conditions, and different coatings can be applied at different positions for easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

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

[0037] Figure 2is a schematic cross-sectional view of a coating in some embodiments of the present application;

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

[0039] Figure 4 This is a real picture of the end face of a light alloy wheel hub with an impact-resistant and wear-resistant coating in some embodiments of the present application. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

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

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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, and it can be conduction between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0046] In some embodiments of the present application, a method for preparing a light alloy wheel hub end surface 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 15-45 μm as spray powder, and the content of tungsten carbide powder is 5%; mix the two powders and load them into a powder mixer, and the mixing time is 60 minutes;

[0048] 2) A cold spraying device controlled by a robotic arm was used to prepare a thick coating with a coating thickness of 8 mm and a porosity of 1.5%;

[0049] 3) placing the prepared thick coating into a heat treatment furnace for heat treatment at a temperature of 150° C. for a holding time of 3 h, and cooling to room temperature with the furnace after the holding is completed;

[0050] 4) Processing the thick coating obtained in step 3) into a cylindrical shape with threads on the side, wherein the diameter of the cylindrical coating is 12 mm, the thread pitch is 1.5 mm, and the thread depth is 0.6 mm;

[0051] 5) A circle of grooves is machined on the side of the threaded cylindrical coating obtained in step 4). The groove position is 3 mm away from the end of the coating, the groove width is 3 mm, and the depth is 3 mm.

[0052] 6) Drill threaded holes at the locations where impact-resistant and wear-resistant coatings are required on the wheel hub end faces. The threaded hole specifications are consistent with the threads of the coating to ensure that the coating is fixed in the substrate; and a circle of grooves are machined on the side of the threaded hole. The groove position on the side of the threaded hole is 3mm from the bottom of the threaded hole, the groove width is 3mm, and the depth is 3mm.

[0053] 7) The threaded coating obtained in step 5) is placed into the threaded hole obtained in step 6) and fixed.

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

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

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

[0057] 1) Select SUS316 powder and tungsten carbide powder as spray powder, the content of tungsten carbide powder is 10%. Both spray powders are spherical. The particle size is 15-45μm. Mix the two powders and put them into the powder mixer. The mixing time is 60min.

[0058] 2) A cold spraying device controlled by a robotic arm was used to prepare a thick coating with a coating thickness of 10 mm and a porosity of 2%.

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

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

[0061] 5) A circle of grooves is machined on the side of the threaded cylindrical coating obtained in step 4). The groove position is 2 mm away from the end of the coating, the groove width is 2 mm, and the depth is 2 mm.

[0062] 6) Drill threaded holes at the locations where impact-resistant and wear-resistant coatings are required on the wheel hub end faces. The threaded hole specifications should be consistent with the threads of the coating to ensure that the coating can be fixed in the substrate. A circle of grooves is machined on the side of the threaded hole. The groove position on the side of the threaded hole is 2mm from the bottom of the threaded hole, the groove width is 2mm, and the depth is 2mm.

[0063] 7) The threaded coating obtained in step 5) is placed into the threaded hole obtained in step 6) and fixed.

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

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

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

[0067] The present application overcomes the shortcomings of traditional coatings such as weak bonding between the wheel hub and lack of impact resistance, as well as the problem that the entire wear-resistant coating is easily detached after being bonded to the wheel hub. The impact-resistant and wear-resistant coating prepared by the present application has high bonding strength, and the bonding between the coating and the substrate is increased by means of multiple threaded fastenings. In addition, grooves are opened on the coating and the substrate to inject metal repair agent, and the cured metal repair agent strengthens the connection between the coating and the substrate, which can effectively reduce the possibility of coating peeling during actual use of the wheel hub. The coating can be applied at specific positions of the wheel hub according to actual working conditions, and different coatings can be applied at different positions for easy operation.

[0068] The light alloy wheel hub end face prepared by the preparation method of the present 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 method; the metal repair agent fills the groove, which greatly enhances the bonding force between the coating and the substrate. The present application can also prepare wear-resistant coatings composed of different materials by selecting different spray powders. Different wear-resistant coatings can be installed according to the different required positions of the wheel hub to adaptively adjust the wear resistance of different positions.

[0069] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for preparing a light alloy wheel hub end surface with an impact-resistant and wear-resistant coating, characterized in that: The following steps are involved: 1) Mixing the wear-resistant coating raw material powders; 2) placing the mixed powder obtained in step 1) into a cold spray powder feeder, and preparing a coating using a cold spray device controlled by a robotic arm; 3) heat treating the coating obtained in step 2) to eliminate internal stress of the coating; 4) processing the coating obtained in step 3) into a cylindrical shape with threads on the side; 5) machining a circle of grooves on the side of the threaded cylindrical coating obtained in step 4); 6) Drill threaded holes at the locations where impact-resistant and wear-resistant coatings are required on the end faces of the hubs, and make a circle of grooves on the sides of the threaded holes; 7) placing the threaded cylindrical coating obtained in step 5) into the threaded hole obtained in step 6) and fixing 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 the wear-resistant coating obtained in step 8) is cured at room temperature, and after the curing is completed, the coating and the end face of the wheel hub are processed to the same height.

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

3. The method for preparing the end surface 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 SUS316 powder and tungsten carbide powder are mixed for spraying, wherein the content of tungsten carbide powder is 5%-10%; and the mixing time of SUS316 powder and tungsten carbide in step 1) is 60min-180min.

4. The method for preparing the end surface 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 spray powders are prepared to prepare wear-resistant coatings composed of different materials. Different wear-resistant coatings are installed according to different required positions of the wheel hub to adjust the wear resistance of different positions.

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

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

7. The method for preparing the end surface 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 10-14 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 hub while ensuring the bonding strength of the coating.

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

9. A light alloy wheel hub end face, characterized in that: Prepared by the preparation method described in any one of claims 1 to 8.

10. A road wheel, characterized in that: The invention comprises the light alloy hub end face as claimed in claim 9.

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