MATHEMATICAL MODELING OF MRR FOR ELECTRICAL DISCHARGE MACHINING

Abstract

The right selection of manufacturing parameters is one of the most important aspects in the electrical discharge machining operation as these conditions has important effect on material removal rate (MRR). In this work the experiments are conducted on the machining of EN 31 die steel with graphite electrode in electrical discharge machining (EDM). The EDM oil commercial grade has been used as dielectric fluid. The effect of various EDM parameters such as discharge current, Ton and Toff has been investigated to yield the response in terms of MRR. In this work mathematical models have been developed for relating the MRR with machining parameters like discharge current, Ton, and Toff. The optimum value has been determined with the help of main effect plot and Annova table. With the help of MINITAB 15 software mathematical modeling has been done. The optimum value for MRR has been determined.