Method for performing laser-assisted grinding on surface of superhard material grinding tool

Abstract

The invention provides a method for performing laser-assisted grinding on the surface of a superhard material grinding tool. The laser-assisted grinding method is adopted, the characteristics of high energy density and high cooling rate of laser are utilized, and the surface of the superhard material grinding tool is subjected to laser polishing pretreatment; because the expansion coefficients of a grinding tool matrix and diamond have great difference, the interface of the grinding tool matrix and the diamond is easily separated at a great cooling rate to form cracks; moreover, the laser with high energy density can gasify and boil matrix metal in a molten pool, and defects such as cracks and holes are formed on the surface of the grinding tool; and in addition, diamond abrasive particles in a polishing layer on the surface of the grinding tool are heated and combusted to be decomposed into CO2 or graphitized into low-strength graphite, the hardness or wear resistance of the surface of the grinding tool is greatly reduced, and the factors make the machined surface easily stripped and dropped in the subsequent mechanical grinding process, so that the aim of efficiently performing mechanical grinding on the superhard material grinding tool is fulfilled.

Description

technical field [0001] The invention belongs to the technical field of forming and manufacturing superhard material abrasive tools, in particular to a method for laser-assisted grinding on the surface of superhard material abrasive tools. Background technique [0002] Superhard material abrasives are widely used in high-precision machining and manufacturing in the fields of automobiles, aerospace, semiconductors, etc., so the abrasives themselves need to meet high precision requirements. After sintering, the surface of superhard material abrasive tools often needs to be ground to meet product precision requirements while reducing surface roughness and improving surface quality. The currently used method is to directly mechanically grind the surface of the superhard material abrasive tool, but the inside of the abrasive tool contains superhard abrasive grains such as diamond and CBN, which have high hardness and excellent wear resistance. Traditional mechanical grinding can o...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the processing efficiency is low, the energy consumption is large, and the grinding process generates a lot of heat, which can easily cause burns on the abrasive tools.

In addition, for metal abrasive tools, the directional pressure applied by the grinding process will form a texture inside the abrasive tool, resulting in uneven plastic deformation, and at the same time, a large residual internal stress will be formed, which seriously affects the accuracy of the abrasive tool

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