Multi-Performance Optimization of Wire Cut EDM Process Parameters on Surface Roughness of AA7075 / B4Cp Metal Matrix Composites

Abstract

This paper focus on multi performance optimization of process parameters for wire cut electric discharge machining of AA7075/B4C (15%) metal matrix composites processed by stir casting technique using taguchi�s design of experiment and regression analysis. The machining was performed as per design of experiments approach using L9 orthogonal array. Four wire cut electric discharge machining parameters namely pulse-on-time (TON), pulse-off-time (TOFF), spark voltage (SV) and wire tension (WT) were chosen as machining process parameters. Signal-to- noise ratio is used to find the optimal combination of process parameters. The mathematical relationships between wire cut electric discharge machining input process parameters and response parameter are established to determine optimal values of surface roughness by using regression analysis. The Analysis of variance (ANOVA) and F-test are performed to obtain statistically significant process parameters. The generated optimal process conditions have been verified by conducting confirmation experiments and predicted results have been found to be in good agreement with experimental findings.