APPLICATION OF MULTI-CRITERIA DECISION MAKING TECHNIQUE IN WIRE-EDM FOR 90CrSI TOOL STEEL BY MARCOS METHOD

Abstract

This paper represents results of applying MCDM technique to select optimal input parameters for wire-cut electrical discharge machining (wire-cut EDM) of 90CrSi tool steel. To solve the MCDM problem, the MARCOS method was utilized, and the Entropy method was used to determine the criteria weights. This work investigated six input parameters, including cutting voltage (VM), pulse on time (t_on), pulse off time (t_off), servo voltage (SV), wire feed (WF), feed speed (SPD), and workpiece cutting radius (R). Additionally, a 2^7-2 design experiment and 32 experimental runs were performed to address the MCDM issue. According to the results of the study, experiment No. 7 produced the best results with the following input parameters: VM=9 (V), t_on=12 (μs), t_off=13 (μs), SV=25 (V), WF=8 (mm/min), SPD=4.5 (mm/min), and R=9 (mm). The results are promising to practically apply in industrial manufacturing.