Optimization of ejecting-explosion EDM parameters on SiCp/Al using signal-to-noise ratio and grey relational analysis
With the increasing application of SiCp/Al,higher requirements are put forward for their processing efficiency and sur-face quality.In response to the above questions,based on the orthogonal test of L25(56),20％of SiCp/Al composites are pro-cessed using a new and efficient EDM processing method—ejecting-explosion EDM.The main optimization indicators are MRR,TWR and Ra,and the process parameters are high-voltage wave current,high-voltage wave voltage,low-voltage wave current,low-voltage wave voltage,pulse width and phase difference.Based on the orthogonal test results,the influence of each process parameter on different optimization indicators and the combination of single-objective optimal processing parameters are studied by using the Signal to Noise Ratio(SNR).Based on the Grey Relational Analysis(GRA),the weights of each optimization index are determined according to the Analytic Hierarchy Process(AHP),and the multi-objective optimal processing parameter combi-nation of the three optimization indicators is comprehensively considered and verified by experiment.The results show that the op-timal process parameter combination for multi-objective optimization is high-voltage wave current 6 A,high-voltage wave voltage 120 V,low-voltage wave current 2 A,low-voltage wave voltage 100 V,pulse width 10 μs,and phase difference 50％,and pro-cessing by using this processing parameter combination can effectively improve the processing efficiency and surface quality.
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