Process Parameter Optimization in EDM using Ni Coated Electrode for MRR and Ra Using Taguchi Method and TOPSIS for Titanium Alloy

Abstract

Currently, using coated electrodes in EDM is a new technology, and the effectiveness of this technical solution in improving the EDM machining process has been proven by recently published results. However, research to determine the optimal set of process parameters in EDM with coated electrodes is very necessary, because it will contribute to improving the efficiency of using this technology in practice. In this article, the optimal process parameters in EDM with Nickel Coated Electrode for Ti-6Al-4V have been determined. The Topsis method is used to solve the multi-objective problem in this study. The problem experimental work was performed using Taguchi based L16 orthogonal to solve multi-objective optimization. The current (I), voltage (U) and pulse on time (Ton) were used as input response variables for investigation process while material removal rate (MRR) and surface roughness (SR) were selected as performance measures. The experimental results show that the optimal process parameters of the multi-objective decision problem in EDM with Nickel Coated Electrode include U = 40 V, I = 40 A, Ton = 1000 µs, resulting in an MRR of 0.028 mg/ min and an SR of 7.56 µm. The combination between TOPSIS and Taguchi method has contributed to reducing the time and cost of experimental research.