PARAMETRIC ANALYSIS OF WIRE EDM PROCESS VARIABLES USING GREY ANALYSIS

The Wire-cut Electrical Discharge Machining (WEDM) is one of the nonconventional techniques working on spark erosion principle between the workpiece and an electrode. Wire EDM's surface finish is deliberately influenced by its parameters and machined material properties. So, better combinations of the machining parameters need to be selected for the better results, this may come through either by an experience or through experimental investigation. The experiment is done in accordance to Taguchi design methodology. The material selected is Stainless Steel SS420. The experimentation is accomplished using design of experiments with L27 orthogonal array. The process parameters of wire EDM selected in this work are pulse on time(Ton), pulse off time(Toff), wire tension(WT), wire feed(WF), servo voltage(SV), kerf width(KW) which are used to determine the performance and increase the efficiency of the stainless-steel metal. This analysis includes Grey Relational Analysis (GRA). Using GRA assess the multiple performance characteristics based on grey relational coefficient of each response.