EXPERIMENTAL INVESTICATION AND OPTIMIZATION OF WIRE EDM PARAMETERS FOR SURFACE ROUGHNESS, MRR AND MACHINING TIME IN SS304

With the increasing demands of high surface finish and machining of complex shape geometries, conventional machining process are now being replaced by non-traditional machining processes. Wire EDM is one of the non-traditional machining processes. Surface roughness, material removal rate and machining time are of crucial importance in the field of machining processes. The objective of optimization is to attain the minimum machining time, best surface integrity and material removal rate simultaneously. In this present study stainless steel SS304 is used as a work piece, brass wire of 0.25mm diameter used as a tool and water is used as a dielectric fluid. For experimentation Taguchi’s L9 orthogonal array has been used. The Test of hypothesis of the model resulted satisfactorily for the fitness function. Further a mathematical model developed using regression analysis which can be used for finding optimized values of pulse on time, pulse off time, peak current, and voltage.