Study the effect of pulsed current on hardened tool steel operation by using the electric discharge machining (EDM)

This paper reports the results of an experimental investigation carried out to study the effects of machining parameters such as pulsed current on material removal rate, diameteral overcut, electrode wear and surface roughness in electric discharge machining of En-31 tool steel (IS designation: T105 Cr 1 Mn 60) hardened and tempered to 55HRc. The work material was ED machined with copper, copper tungsten, brass and aluminum electrodes by varying the pulsed current at reverse polarity.