On the experimental study of Electric Discharge Machining (EDM) of P20 type tool steel

Evaluating customer demands to link with manufacturer may have the most important role in producing parts with utmost preciseness. Replacing traditional manufacturing process with modern and advanced process technology has already been an important alternative in competitive world market, which may fulfill the customer satisfaction in long term. Electric Discharge Machining (EDM) is one of the advanced process technology, which belongs to non-traditional manufacturing process. It is quite an expensive machining process, which is mostly used in producing molding dies of different kinds and smart pats as well as the wire EDM processes. We can say it is a thermo electrical process with analyzable material removal system. The aim of this paper is to test the effect of EDM parameters on P20 type tool steel. This type of tool steel is largely used in producing different kinds of molding dies in many industries. At this research work we have used different kind of tool electrode materials like graphite, copper and Brass. The effective parameters of electric discharge machining and outputs (response variables) of working material were defined as follows: Open circuit voltage (V), Peak current(I_c), Pulse on time (T_on), Tool wear ratio (TWR), Surface roughness (R_a), Material removal rate (MRR), and Electrode wear ratio (EWR).