Wear Mechanism Of Diamond Tool In Rotary Ultrasonic Grinding Of Tungsten Alloy

Tungsten alloy with high density,small thermal expansion coefficient,adiabatic shearing ability and ability to absorb radiation characteristics,are widely used in aircraft missile is inertial element,core,nuclear reactor radiation shielding cover,leaf collimator and balancing precision parts manufacturing,these parts in the field of atomic energy,precision medical instrument,aviation and military fields have important role.Natural single crystal diamond is the most ideal ultra-precision cutting tool material.However,the tool wear mechanism of diamond cutting tungsten alloy is not clear,which becomes the technical bottleneck restricting the high quality cutting of tungsten alloy.Therefore,revealing the tool wear mechanism of diamond cutting tungsten alloy can not only provide a theoretical basis for suppressing tool wear,but also provide guidance for the development and manufacture of high-performance cutting tools for tungsten alloy,and contribute to the high-quality machining of tungsten alloy.This paper aims at the wear problem of diamond tools in rotary ultrasonic grinding of tungsten alloys.Based on the theory of thermodynamics,the analysis and calculation of the direction of chemical reaction and the temperature range of the reaction are carried out to speculate the types of chemical reactions that occur during the grinding process,and to predict the reaction products.The mechanism of diffusion wear and oxidation wear is analyzed in depth.According to this theory,the simultaneous thermal analysis test of diamond and tungsten alloy was carried out to study the wear form of diamond under oxygen-free and oxygen-free conditions.The results showed that the main form of diamond wear under anaerobic conditions is diffusion wear,the initial temperature of diamond graphitization is about 1080?;under oxygen conditions,both oxidative wear and diffusion wear coexist,and the initial temperature of diamond graphitization is approximately 720?.Based on the above theories and experiments,this paper analyzes the effects of grinding speed,grinding depth and ultrasonic vibration on the grinding force,grinding temperature and diamond wear in the grinding process through the simulation and experiment of rotating ultrasonic single particle diamond grinding of tungsten alloys.It summarizes the advantages of rotary ultrasonic grinding in reducing grinding force,grinding temperature and diamond wear.Combining the reaction types and reaction product analysis results of thermodynamics and simultaneous thermal analysis,it reveals that diamond grinding tungsten alloys under thermal and mechanical coupling The wear regularity and wear mechanism of Tungsten alloy provide a theoretical basis for further research on the suppression measures of diamond tool wear in tungsten alloy grinding.