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

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.