A Parametric Optimization of Tool Wear Rate on INCONEL718 using Different Electrode on EDM

Electrical Discharge Machining or EDM is a machining method primarily used for hard metals or those that would be impossible to machine with traditional techniques. EDM only works with materials that are electrically conductive. EDM is a thermoelectric process in which heat energy of spark is used to remove material from the workpiece. Electrical discharge machining performance is mainly find out on the basis of Material Removal Rate (MRR), Tool Wear Rate (TWR) and Surface Roughness (SR). The important EDM machining parameters are Peak current, pulse on time, pulse off time, voltage, arc gap, flashing pressure and duty cycle. The Workpiece material selected in this work is INCONEL718 is a High Strength, Temperature Resistant (HSTR) Nickel based super alloy. The tool material is Aluminum, Copper and Brass. The input variable parameters are current, pulse on time and pulse off time and output parameter is tool wear rate for optimization. Taguchi Method is applied to reduce the experiment and ANOVA method is used to optimization of output parameter is used to optimize the parameters using MINITAB 17 software.