Simulation And Experimental Research On Ultrasonic Assisted Grinding On GH4169 Superalloy

GH4169 superalloy can maintain excellent strength and stability in high temperature environments,which is widely used in key fields such as aerospace,chemical energy,and nuclear energy.However,the difficulty of machining of superalloys limits its development.It solves the problems of large cutting force,severe tool wear and high processing temperature during the processing of GH4169 superalloys,which has high practical application value for optimizing the processing technology of superalloy,obtaining high quality parts and improving material processing efficiency.Ultrasonic assisted grinding has effects in reducing grinding force,reducing tool wear,increasing removal rate and improving surface finish.Therefore,ultrasonic assisted grinding technology has application prospects in the field of processing superalloy.However,the current research on ultrasonic grinding of superalloys is not comprehensive,and the application effect needs to be verified.Based on the above problems,this research aims at the difficult machining of GH4169 superalloy and uses ultrasonic-assisted grinding processing methods to study the influence of ultrasonic assisted grinding process parameters on grinding force,grinding wheel wear and grinding surface quality,and adopts the method of combining dynamic simulation and machining experiment to establish the prediction model of ground surface morphology and roughness,The main research contents include:The grinding force and grinding force ratio are analyzed of GH4169 superalloy ultrasonic-assisted grinding by changing the spindle speed,feed rate,and grinding depth.Taking ordinary grinding as a control,the influence of the introduction of ultrasonic vibration on the grinding force and the form of material removal are studied under different process parameters;In order to study the effect of ultrasonic vibration on the wear mechanism of grinding wheels,the ultrasonic-assisted grinding GH4169 superalloy grinding wheel wear research was carried out.The indirect method was used to compare the wear of the grinding wheels under the two processing methods,the influence of ultrasonic vibration on the wear behavior of the grinding wheel is obtained by observing the form of abrasive wear;the wear of the grinding wheel directly determine the quality of the grinding surface.The surface morphology and surface roughness under different process parameters are observed,the influence of spindle speed,grinding depth,and feed rate on the surface quality of ultrasonic assisted grinding are analyzed.The formation mechanism of ultrasonic assisted grinding morphology is analyzed deeply,the simulation study of ultrasonic-assisted grinding morphology was carried out to solve the ultrasonic cutting trajectory of abrasive particles.The cutting geometry model of abrasive particles and materials is constructed,three dimensional model of material grinding process is generated.Combining experiments to verify the accuracy of the ultrasonic assisted grinding surface morphology and roughness prediction model,the simulation analysis of ultrasonic assisted grinding of superalloy was carried out by changing the process parameters such as spindle speed,feed rate,ultrasonic amplitude and ultrasonic frequency of the prediction model.This model provides a new method for studying the surface quality of ultrasonic grinding,and provides a theoretical basis for exploring the optimization of high quality processing parameters for ultrasonic assisted grinding of GH4169 superalloy.