Abstract
Electrical Discharge Machining (EDM) has emerged as a well known manufacturing process where machining takes place by periodic electric discharge between tool and workpiece. This has been recognized as an efficient technology for precision machining of electrically conducting hard materials. A lot of experimentation has been carried out to find the optimum parameters for the EDM process. Researchers have also used powder metallurgy electrodes to study their influence on surface properties and output process parameters. In this paper, powder metallurgy electrodes prepared with different compositions of copper and manganese has been used to machine EN-31 die-steel. Comparisons have been made with copper electrode for micro-hardness and surface roughness behavior of workpiece and it has been found that copper-manganese (in weight ratio 70-30) composite electrode shows better results than copper-manganese (in weight ratio 80-20) electrode and copper electrode.
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