Thermal metal spraying method for brake table roller

Abstract

The invention discloses a brake table roller metal thermal spraying method which comprises the following steps: 1, blow-washing: after a roller is processed, carrying out surface blow-washing by using compressed air, so that the surface roughness of the roller reaches 100 microns; 2, fixing: placing the roller on a lathe, and rotating at a low speed; 3, spraying: feeding the amorphous alloy into a spray gun opening through compressed air by using a supersonic electric arc spraying method, melting the amorphous alloy at a high temperature, spraying the amorphous alloy to the surface of the roller at an extremely high speed, and adhering the amorphous alloy to the surface of the roller after surface melting, impact and cooling are combined; and 4, continuous spraying: spraying the surface of the roller for multiple times along with the continuous rotation of the roller and the uniform-speed movement of the spray gun, and finally forming a multi-layer amorphous alloy coating on the surface of the roller to finish spraying. According to the metal thermal spraying method for the brake table roller, the hardness of the surface of the roller can be not lower than HV800, the hardness is high, and the wear resistance is high; the roughness of the roller can reach not less than 200 microns, the adhesion coefficient is not less than 0.80, and the friction force is strong, so that a tire in contact with the roller is not easy to slip; the service life of the roller is not less than 200000 times of tire braking force detection, and the durability is high.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle detection equipment, and in particular to a metal thermal spraying method for a brake platform roller. Background Art

[0002] At present, the number of cars in my country is increasing. Braking is a key factor in car safety, and the detection of car braking has also become an important project. The current equipment for detecting car braking is a brake stand, which mainly drives the wheel to rotate through a roller, and uses the slip difference between the wheel and the roller when the wheel is braked to detect the braking force.

[0003] In this technical context, the friction between the wheel and the roller is a problem that must be faced. The roller must have good hardness, friction and a long service life to withstand such a harsh working environment. Existing rollers are made of ordinary stainless steel, without any surface treatment, low hardness, too little friction, resulting in rapid wear and easy slippage. Summary of the invention

[0004] The object of the present invention is to provide a brake drum metal thermal spraying method to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The metal thermal spraying method of the brake drum comprises the following steps:

[0007] 1. Blowing and washing: After the roller is processed, use compressed air to blow and wash the surface so that the surface roughness of the roller reaches 100um;

[0008] 2. Fixing: Place the drum on the lathe and rotate it at low speed;

[0009] 3. Spraying: Use supersonic arc spraying method to send amorphous alloy into the spray gun through compressed air. After the amorphous alloy is melted at high temperature, it is sprayed onto the drum surface at a very fast speed. Combined with surface melting and impact, after cooling, the amorphous alloy is attached to the drum surface;

[0010] 4. Continuous spraying: With the continuous rotation of the drum and the uniform movement of the spray gun, the drum surface is sprayed multiple times, and finally a multi-layer amorphous alloy coating is formed on the drum surface, and the spraying is completed.

[0011] The brake station roller metal thermal spraying method described in this patent can achieve a hardness of the roller surface of not less than HV800, with high hardness and strong wear resistance; the roller roughness can reach not less than 200um, the adhesion coefficient is not less than 0.80, and the friction is strong, making it difficult for the tire in contact with it to slip; the roller life is not less than 200,000 times of tire braking force detection, and it is highly durable. DETAILED DESCRIPTION

[0012] The metal thermal spraying method of the brake drum comprises the following steps:

[0013] 1. Blowing and washing: After the roller is processed, use compressed air to blow and wash the surface so that the surface roughness of the roller reaches 100um;

[0014] 2. Fixing: Place the drum on the lathe and rotate it at low speed;

[0015] 3. Spraying: Use supersonic arc spraying method to send amorphous alloy into the spray gun through compressed air. After the amorphous alloy is melted at high temperature, it is sprayed onto the drum surface at a very fast speed. Combined with surface melting and impact, after cooling, the amorphous alloy is attached to the drum surface;

[0016] 4. Continuous spraying: With the continuous rotation of the drum and the uniform movement of the spray gun, the drum surface is sprayed multiple times, and finally a multi-layer amorphous alloy coating is formed on the drum surface, and the spraying is completed.

[0017] The brake station roller metal thermal spraying method described in this patent can achieve a hardness of the roller surface of not less than HV800, with high hardness and strong wear resistance; the roller roughness can reach not less than 200um, the adhesion coefficient is not less than 0.80, and the friction is strong, making it difficult for the tire in contact with it to slip; the roller life is not less than 200,000 times of tire braking force detection, and it is highly durable.

[0018] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Brake drum metal thermal spraying method, characterized in that: The steps include: 1) Blowing and washing: After the roller is processed, use compressed air to blow and wash the surface so that the surface roughness of the roller reaches 100um: 2) Fixing: Place the drum on the lathe and rotate it at low speed; 3) Spraying: Use supersonic arc spraying method to send amorphous alloy into the spray gun through compressed air. After the amorphous alloy is melted at high temperature, it is sprayed onto the drum surface at a very fast speed. Combined with surface melting and impact, after cooling, the amorphous alloy is attached to the drum surface; 4) Continuous spraying: With the continuous rotation of the drum and the uniform movement of the spray gun, the drum surface is sprayed multiple times, and finally a multi-layer amorphous alloy coating is formed on the drum surface, and the spraying is completed.