Modeling and Parametric Optimization of Process Parameters of Wire Electric Discharge Machining on EN-31 by Response Surface Methodology

Nowadays, the majority of industry uses nonconventional machines; wire electric discharge machining is one of them. In this experimentation, optimize process parameters of wire electric discharge machining with help of response surface methodology. Central composite design is used for the design of experiments. The process parameters considered for this study are a pulse on time, wire feed rate, pulse off time, and servo voltage. For this experimentation work, EN-31 used as workpiece material. The high percentage of carbon present in the material due to this is used for manufacturing punches and dies. To find out significant factors, ANOVA is calculated. Analysis of variance for MRR clearly shows that pulse on time and servo voltages are the most significant parameters. From result analysis, the high value of MRR is obtained at high value of pulse on time and low value of servo voltage. In the case of surface roughness also pulse on time and servo voltage are the most significant factors as compared to others; the low value of surface roughness is obtained at a low value of pulse on time and high value of servo voltage.