Experimental Study on Micro Electrical Discharge Machining of Al2O3-TiC Ceramics
To study the effects of the processing parameters of Al2O3-TiC ceramics on the processing performance during electrical discharge machining(EDM),a mixed 2-3 level orthogonal test was designed,which was designed with polarity,inter-electrode voltage,maximum discharge current,gain,pulse frequency,pulse width,and discharging gap.Three kinds of target performance,including electrode length loss,electrode contour loss,material removal rate were selected.Through the range analysis,the effects of the processing parameters on the processing performance was obtained.Combining with analysis of variance,the polarity has a significant impact on the electrode loss;the inter electrode voltage and pulse current have a significant impact on the material removal rate.Taking the three factors into account,the optimal combination level of machining parameters is a negative processing polarity,electrode voltage of 130 V,peak current of 50 A,45 gain,pulse frequency of 150 Hz,pulse width of 1.0 μs and discharging gap of 40 μm.
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