Multi-Response Optimization of EDM Parameters for Complex Surface Removal of Al 6061

The present investigation explored an innovative approach for the complex surface removal selectively using electric discharge machining (EDM) process. The parametric effects on the selective material removal of Al 6061 surface is performed by modified mild steel tool electrode where the influence peak current, pulse on-time and pulse off-time on the output responses such as TWR, MRR, Ra and ED is evaluated. The outcomes of this investigation demonstrated that the TWR, MRR, Ra and ED increase with an increase in I p and T on whereas decrease with a decrease in pulse off-time. I p has a significant contribution of 50.97% for TWR, 59.02 % for MRR 56.88 % for Ra and 54.50 % for ED as per ANOVA results. The optimal parameters selection is done using the multi-criteria decision-making TOmada de Decisao Interativa Multicriterio (TODIM) method. For equal weightages of all the output responses the common optimum condition is obtained at 6A of I p 400μs of T on and 75μs of T off .