Invertis Journals of Science & Technology

Sagar Chugh ¹, Sanjeev Goyal ¹, Sanjay Kumar ¹

Affiliations
1 Department of Mechanical Engineering, YMCA University of Science & Technology, Faridabad-121006, IN

Abstract

Electrical Discharge Machining (EDM) is a non-contact machining process, which electrically removes material from any conductive workpiece. This is achieved by applying high frequency pulsed current to the workpiece through a tool electrode immersed in a dielectric fluid which subsequently melts and vaporizes the workpiece material. Unlike the traditional machining method, EDM offers many advantages, for instance, it can be used to machine very complex shape by using a simple tool electrode. In addition, the ease of machining in EDM process is only depending on the λ·θ·ρ theory, which is the product of thermal conductivity (λ), melting point (θ) and electrical resistivity (ρ) of workpiece material. As a product of electrical discharge, debris are created and accumulated in the sparking gap between the tool electrode and the workpiece. If the amounts of debris in the machining gap are too large, reduction of resistance occurs and encourages the formation of abnormal discharges, which leads to significant tool wear and slows down the material removal rate.

Keywords

WEDM, Performance Parameter.

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Sagar Chugh ¹, Sanjeev Goyal ¹, Naresh Yadav ¹

Affiliations
1 Department of Mechanical Engineering, YMCA University of Science & Technology, Faridabad-121006, IN

Abstract

The challenge of modern industries is mainly focused on the achievement of high quality, in terms of work dimensional accuracy, surface finish and higher MRR. Wire EDM machines are used to cut conductive metals of any hardness or that are difficult or impossible to cut with traditional methods. Wire EDM uses a very thin wire 0.02-0.03 mm in diameter as an electrode and machines a workpiece with electric discharge like a bandsaw by moving either workpiece or wire. The prominent feature of moving wire is that a complicated cut-out can be easily machined without using a forming electrode. This machining process is not limited by hardness, toughness and brittleness of the material and can produce intricate shape on any workpiece by suitable control over the physical parameters of the processes Machine tool industry has made exponential growth in its manufacturing capabilities in last decade but still machine tools are not utilized at their full potential. The main problem arrives in this process is the proper selection of parameters so as to utilize the process capability to full its potential. As in case of wire EDM, the limitation arises due to poor MRR and higher surface roughness which has attracted the attention of the researchers and practising engineers.

Keywords

Wire EDM, Performance Parameter.

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