Abstract
Abstract In this experimentation tried to optimize spark gap in wire electric discharge machining on AISI 4140. The parameters considered for this study is Pulse on time (Ton), Pulse off time (Toff), Servo Voltage (SV), and Wire Feed (WF). AISI 4140 majorly used in defense because it is high hardness and strength and literature review available on wire electric discharge machining of AISI 4140 is scanty. Due to this reason, AISI 4140 is chosen for this study. Analysis of variance and regression analysis is carried out by using Minitab-18 software. Analysis of variance (ANOVA) gives percentage contribution of each factor for spark gap and regression analysis gives the mathematical relationship between process parameters and spark gap. For optimization purpose, Taguchi L9 orthogonal array is used. From ANOVA it is clear that servo voltage is the major influencing parameter than other parameters for spark gap. After optimization i.e. (machine parameters set at the optimum level) percentage decrement in spark gap is 72.52%
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