Investigation of surface roughness for EN-31 by REDM with graphite electrode

Abstract

Machining of EN-31 is supposed to be very difficult by conventional machining methods. A rotational electrical discharge machine (REDM) has been developed with concentration of abrasive particles in oil. Investigations have been carried out for machining EN-31 material by REDM with graphite electrodes (Ge). Analysis of REDM process parameter has made to carry out on EN-31 for Surface Roughness (R_a) with graphite electrode (G_e). The experiments have been performed with three parameters: Peak current (P_c), tool rotation (T_rpm) and abrasive concentration (A_c). The variable concentration of silicon carbide (SiC) has been used to analyse the R_a at various concentration such as 60, 80 & 100 g/L. Optimal results have been obtained for process parameters, Pc – 12 amp, Trpm – 1800 rpm and Ge – 80 g/L.