Multi-response optimization of the machining characteristics in electrical discharge machining (EDM) using span-20 surfactant and chromium (Cr) powder mixed

Effects of Chromium (Cr) powder concentrations (C-p) and Span-20 surfactant concentrations (C-s) on AISI D2 hardened steel were evaluated using response surface methodology (RSM) and parameter processing parameter were optimized for optimal parameter conditions using multi-response desirability function. Responses taken involved material removal rate (MRR), electrode wear rate (EWR) and surface roughness (R-a). The experimental plan was based on the face centered, central composite design (CCD) using version 10.0 of the Design Expert software. The results identified that C-p is the most important parameter to maximize material removal rate (MRR) and minimize electrode wear rate (EWR) and surface roughness (R-a). With the topmost desirability solution, the suggested optimum parameter condition of C-p and C-s were 2.155 g/L and 10.000 g/L, respectively.