Experimental Investigation of Surface Roughness and Kerf Width During Machining of Blanking Die Material on Wire Electric Discharge Machine

Wire electric discharge machine (WEDM) is spark erosion in unconventional machining technique to cut hard and the conductive material with a wire as an electrode. The blanking die material SKD 11 is a high carbon and high chromium tool steel with high hardness and high wearing resistance property. This tool steel has broad application in press tools and dies making industries. In this research study the behavior of six process parameters includes Ton (pulse on time), Toff (pulse off time), IP (peak current), SV (servo voltage), WF (wire feed rate) and WT (wire tension) base on design of experiment method during WEDM of SKD 11 were experimentally studied. The 0.25 mm diameter of the brass wire has used as the electrode to cut the work piece. The surface roughness and kerf width are selected as performance measurement. Response Surface methodology (RSM) is utilized for process optimization as well as for formulating regression model for correlating process parameters with performance measurements.