Title: Multi-objective parametric optimisation during electrical discharge machining of Inconel 718 with different electrodes

Authors: Naveen Beri; Sachin Maheshwari; Chitra Sharma; Anil Kumar

Addresses: University School of Engineering and Technology, Guru Gobind Singh Indraprastha University, Kashmere Gate, Delhi – 110 006, India; Department of Mechanical Engineering, Beant College of Engineering and Technology, Gurdaspur, Punjab, Pin 143 521, India. ' Division of Manufacturing Process and Automation Engineering, Netaji Subhas Institute of Technology, Dwarka, New Delhi – 110 078, India. ' Department of Mechanical and Automation Engineering, Indira Gandhi Institute of Technology, Kashmere Gate, Delhi – 110 006, India. ' University School of Engineering and Technology, Guru Gobind Singh Indraprastha University, Kashmere Gate, Delhi – 110 006, India; Department of Mechanical Engineering, Beant College of Engineering and Technology, Gurdaspur, Punjab, Pin 143 521, India

Abstract: This paper presents multi-objective parametric optimisation of electrical discharge machining (EDM) process by the Taguchi method with grey relation analysis. Experimental investigations are performed on Inconel 718 with three different electrodes. Orthogonal array (L36) is used to identify the effect of process parameters (viz. polarity, electrode type, peak current, pulse on time, duty cycle, gap voltage, retract distance and flushing pressure) on the performance characteristics in terms of material removal rate, surface roughness and tool wear rate. Using grey relational analysis, grey relational grade has been determined, which effectively represents the aggregate of different process attributes. As a result, a multi-objective parametric optimisation is converted into optimisation of a single grey relational grade. Experimental results have shown that utilisation of optimal machining parameter combination enhances a significant improvement of the grey relation grade and the grey relation grade is improved by 8.72%.

Keywords: electrical discharge machining; EDM; electro-discharge machining; Taguchi methods; orthogonal array; grey relation analysis; GRA; multi-objective optimisation; material removal rate; MRR; surface roughness; tool wear; surface quality.

DOI: 10.1504/IJMATEI.2011.042879

International Journal of Materials Engineering Innovation, 2011 Vol.2 No.3/4, pp.236 - 248

Published online: 26 Mar 2015 *

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