A Review on the Influence of Electrical Process Parameters of Electrical Discharge Machining (EDM) on Surface Roughness and Material Removal Rate
Keywords:
EDM, Process parameters, Material Removal Rate (MRR), Surface Roughness (SR), Polarity.Abstract
Metal removal processes can be divided into two categories-Conventional machining processes and unconventional machining processes. Conventional processes like drilling, turning, milling, shaping, boring, slotting, etc., take more time for machining of a component than unconventional machining processes. Surface finish too, in conventional machining processes, is not as good as in unconventional processes. In machining of many hard materials and their alloys, conventional machining processes become incapable. So, to avoid all such problems, there are many unconventional machining processes like electrical discharge machining (EDM), electro chemical machining (ECM), laser beam machining (LBM), ultrasonic machining (USM), abrasive jet machining (AJM), water jet machining (WJM), etc. EDM can produce complex shapes and machine hard materials easily. In this review article, consideration is given to the influence of electrical process parameters of EDM on metal removal rate (MRR) and surface roughness (SR) like current, voltage, pulse on-time, pulse off-time, duty factor, etc. It was found that surface roughness decreases with decrease in peak current and pulse on-time. MRR increases with increase in pulse on-time, peak current and relative gap voltage. Polarity affects processing speed and finish of EDM operation. MRR is more when tool electrodes are connected at positive terminal than at negative terminal.
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