Method for nano reconstruction of surface texture of metal roller

Abstract

The invention relates to a method for the nano reconstruction of the surface texture of a metal roller, which comprises the following steps: 1) heating the matrix surface of a high-hardness metal roller by adopting an induction coil, wherein the temperature of the roller is between 0.2 and 0.5Tm DEG C, and the Tm is the melting point of a roller material; 2) using high pressure gas and a nozzle to accelerate hard metal particles with the diameter between 40 and 500 microns to the supersonic speed to form a supersonic speed gas-solid two-phase flow to bombard the surface of the roller, performmicro-forging deformation on a surface layer material of the roller, and bombard the surface layer material so as to ensure that the surface layer of the roller generates strong partial plastic deformation and crystal grains are thinned to the nano magnitude; and 3) adopting a high-speed gas flow to perform quick cooking on the surface of the roller, wherein the cooling speed is between 50 and 200 DEG C per second, and the cooling gas may be an inert gas or a reducing gas. The method achieves the surface nano reinforcement of high-hardness roller workpieces, obtains ideal surface nano-grain layers and ultrafine grain layers, and can perform online adjustment on the texture of the processed roller workpieces to ensure the stability of the texture.

Description

technical field [0001] The invention relates to a surface nano-strengthening technology of a roller workpiece, in particular to a nano-reconstruction method of the surface structure of a metal roller. Background technique [0002] Various roller workpieces are key components of iron and steel metallurgical tools and equipment, which play a decisive role in equipment stability and steel quality, but the wear of roller tools is very serious, and the replacement cycle of some roller parts is very short, which affects the effective work of the unit time, increasing the cost of production. Based on the working characteristics of the roll tool, the failure of the material mostly occurs on the surface. For example, the fatigue, corrosion and wear of the material are very sensitive to the surface structure and performance. Therefore, improving the surface strength, hardness and wear resistance of the roll material is the key to extending the roll. Effective way of life. [0003] T...

AI Technical Summary

Problems solved by technology

However, since the bombardment is carried out at room temperature, it does not involve the composition of the metal material to be processed and the requirements of the pretreatment microstructure state on the bombardment conditions, so when processing rotating parts of medium and high carbon steel or low and medium alloy steel materials, the surface is easy to Damage occurs, and a large residual stress is generated below the surface layer, which affects its performance

[0012] In summary, the existing surface coating or deposition, surface strong plastic deformation technology (hammering, surface rolling, mechanical grinding), various surface shot peening techniques and other methods to realize the nanometerization of the surface of metal materials, in addition to their respective existence In addition to the shortcomings and deficiencies, the above methods are only suitable for rollers with low hardness, and for high hardness rollers, due to the difficulty in deformation, the ideal nanocrystalline layer is often not obtained, which is easy to cause surface damage and peeling of the surface layer etc., it is difficult to realize industrial application

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