Multiresponse Optimization of EDM Machining Parameters Using Taguchi Methodology with Grey Relational Analysis

Abstract

In the present research, Taguchi methodology with grey relational analysis has been employed to optimize EDM parameters for multiple responses, i.e. metal removal rate and surface roughness during the EDM machining of Hastelloy C-276 alloy. The experiments have been carried out according to Taguchi approach based on L9 orthogonal array. The gap voltage, peak current and pulse on time have been considered as EDM parameters, while metal removal rate and surface roughness have been taken as responses. A grey relational grade has been obtained from the grey relational analysis. The optimum level of parameters has been obtained on the basis of rank. The percentage contribution of EDM parameters on multiple responses is calculated using analysis of variance. The pulse on time has been found main influencing parameter that affects the metal removal rate as well as surface roughness. The best-performance characteristics have been obtained at the first level of peak current, at first level of gap voltage and at first level of pulse on time. KeywordsHastelloy C-276 alloyGrey relationTaguchi methodologyMRRSurface roughness