Studying The Affect of Current on (MRR) and (EW) in Electrical DischargeMachining (EDM)

The experimental work of this study leads with electro discharge machining (EDM). A system for machining in this process has been developed. Many parameters are studied such as current, dielectric fluid, thickness of the workpiece. The main aim of this work is to calculate the metal removal rate (MRR), electrode wear (EW) using copper electrode when machining stainless steel 304 specimens of thickness (0.4, 0.5, 1mm). Different current rates are used ranging from (10, 15, 20, 25, 30)Amp, and using tap water as a dielectric solution, it found that low current gives a less material removal rate and electrode wear while high current gives a high material removal rate and electrode wear, the dielectric fluid is changed in order to enhance results. The results show that maximum MRR is achieved 1.01164mm/min when machining thickness of workpiece 0.4mm and using electrode of copper metal which gives minimum EW 0.04gm, while when using thickness 0.5mm it gives MRR 0.43828 mm/min and EW 0.12gm, for thickness 1mm the MRR 0.33964mm/min and EW is 0.11gm. The results show also that using distilled water as a dielectric fluid with copper electrode and thickness of workpiece 0.5mm gives minimum MRR 0.13854mm/min and less EW 0.08gm compared with using tap water.