Study of the output responses using Utility concept coupled with Taguchi Philosophy during EDM machining of nickel-based superalloy Inconel 718

Abstract

The primary objective of this research paper is to get the optimum combination of input process parameters such as peak current (IP), open voltage (Vg), pulse-on-time(Ton) & duty factor(τ) for EDM machining of Inconel 718. The output process parameters that we got and studied after experiments were materials removal rate (MRR), electrode wear rate (EWR), and surface roughness (SR). An orthogonal array of process parameters was created, using Minitab software as the design of experiments (DOE). For a single domain of multiple output response parameters, we used the utility method. After that, we used Taguchi optimization method to find out the optimal parameter setting for higher materials removal rate (MRR), lower electrode wear rate (EWR), and lower surface roughness (SR).