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Title: Multi-quality characteristics optimisation on WEDM for Ti-6Al-4V using Taguchi-grey relational theory

Authors: Neeraj Sharma; Rajesh Khanna; Yogesh Kumar Sharma; Rahul Dev Gupta

Addresses: Department of Mechanical Engineering, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala-133207, India ' Department of Mechanical Engineering, D.A.V. University, Jalandhar-144012, India ' Department of Mechanical Engineering, D.A.V. University, Jalandhar-144012, India ' Department of Mechanical Engineering, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala-133207, India

Abstract: In the present research, Ti-6Al-4V alloy was processed on wire-cut electrical discharge machine (WEDM) and the machining responses were analysed. The effect of machining variables was investigated on cutting speed (CS) and surface roughness (SR). Taguchi technique-based L9 orthogonal array was considered for the planning of experiments. Grey relational theory is used for multi-characteristics optimisation. During the research, it was observed that the best optimal setting for the process parameters is A1 B2 C2. At the suggested optimal setting, the predicted value of CS was 0.2044 mm/min and SR was 2.162 μm. These values are predicted at 95% confidence level. Scanning electron microscopy (SEM) investigates the surface morphology after the WEDM process. The surface integrity reveals the white-layer, sub-surface cracks and micro-cracks on the machined surface. The crack intensity increases with the increase of discharge energy.

Keywords: wire-cut electrical discharge machine; WEDM; Ti-6Al-4V; ANOVA; GRA; multi-response optimisation; scanning electron microscopy; SEM.

DOI: 10.1504/IJMMM.2019.098067

International Journal of Machining and Machinability of Materials, 2019 Vol.21 No.1/2, pp.66 - 81

Received: 07 Feb 2018
Accepted: 23 May 2018

Published online: 21 Feb 2019 *

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