Title: Influence of glycerin-air dielectric medium on near-dry EDM of titanium alloy

Authors: Krishnakant Dhakar; Akshay Dvivedi

Addresses: Mechanical Engineering Department, Maulana Azad National Institute of Technology, Bhopal, Madhya Pradesh, 462003, India ' Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247667, India

Abstract: Ti-6Al-4V is one of the most commonly used titanium alloy. The applications involve in the area of aerospace, chemical engineering, biomedical implants, marine industries, etc. The electrical discharge machining (EDM) is an unconventional machining process. It is widely used to produce complex profiles on electrically conductive materials. Near-dry EDM is a process variant of the EDM process. Generally, it uses water-air mixture as a dielectric medium. Near-dry EDM is an environment friendly process. In this investigation near-dry EDM of Ti-6AL-4V was investigated with glycerin-air dielectric medium. The one-factor-at-a-time approach was used for experimentation. The process parameters selected for experimentation were current, duty factor, lift setting, sensitivity setting, flushing pressure, liquid flow rate and gap control. The responses measured were material removal rate (MRR) and surface roughness (SR). The experimental results revealed that glycerin-air dielectric medium produced higher MRR with fine surface finish even at higher current and wear ratio of the process was also less than 1%.

Keywords: near-dry electric discharge machining; dielectric medium; material removal rate; MRR; surface roughness; SR.

DOI: 10.1504/IJASMM.2017.089928

International Journal of Additive and Subtractive Materials Manufacturing, 2017 Vol.1 No.3/4, pp.328 - 337

Received: 31 Mar 2017
Accepted: 29 Sep 2017

Published online: 07 Feb 2018 *

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