Application of MARCOS Method for Determining Best Process Factor for EDM using Graphite Electrodes

Abstract

This paper reports on a study that used graphite electrodes and the multi-criteria decision making (MCDM) approach to determine the optimal process variables for Electrical Discharge Machining (EDM) cylindrical shaped parts of 90CrSi tool steel. The Measurement of Alternatives and Ranking according to COmpromise Solution (MARCOS) methodology was used in the study to answer the MCDM problem, and the Entropy method was used to estimate the weights of the criteria. Additionally, the material removal rate (MRR) and surface roughness (RS) were selected as the investigation's two criteria. In addition, the servo voltage SV, servo current IP, pulse on time T_on, pulse off time T_off, and type of graphite TOG were the five process parameters that were investigated. Additionally, Minitab R19 software's Taguchi method was used to design the experiment and evaluate the results. Moreover, the design L18 (6^1 + 3^4) was applied for this experiment. The optimal process parameters were suggested, and the MCDM problem has been fixed.