Optimization of Processing Parameters for Longitudinal-torsional Composite Ultrasonic Vibration Assisted Helical Grinding for Hole Making Based on Grey Relational Analysis and Entropy Weight Method
In order to optimize parameters of the longitudinal-torsional ultrasonic vibration assisted helical grinding for hole making and improve the processing performance,taking zirconia ceramics as the research object,and pitch,spiral feed speed,spindle speed and ultrasonic amplitude as the process parameters,and the orthogonal method is used to design exper-iment with four factors and three levels,and to measure the grinding force,surface roughness of the wall and bottom of the hole.Using grey correlation analysis and entropy weight method,the optimal process parameters are as follows:pitch is 3.5μm,spiral feed speed is 875mm/min,spindle speed is 20000r/min,ultrasonic amplitude is 6μm.The influence of pitch,ultrasonic amplitude,spindle speed and spiral feed speed on grey correlation degree are decreased successively.The empirical prediction model of grey correlation degree,target parameters and process parameters is established.The optimal process parameters are as follows:pitch is 3.Oμm,spiral feed speed is 875mm/min,spindle speed is 22000r/min,ultrasonic amplitude is 6μm.The surface roughness of the wall and bottom of the hole are 0.12789μm and 0.38137μm,and the grinding force is 9.482N,and the correlation degree is slightly better than the maximum correlation degree of the orthogonal experiment.
万方数据
维普
