Experimental Investigations to Study Electrical Discharge Diamond Cutoff Grinding (EDDCG) Machinability of Cemented Carbide

The present investigation aims at evaluating the performance of electrical discharge diamond cutoff grinding (EDDCG) of cemented carbide. EDDCG is an abrasive based hybrid process consisting of diamond cutoff grinding (DCG) and electrical discharge cutoff grinding (EDCG) and is a playing major role in the processing of modern materials viz. cemented nitrides, titanium alloys, super alloys, composites of metal matrix, cemented carbides, etc. This article investigates the influence of four different parameters viz. rates per minute (RPM) of wheel, gap current, on-time (t(on)), and duty factor (d(f)) on material removal rate (MRR) and surface roughness (R-a). Large numbers of experiments were performed on indigenously built EDDCG set up mounted as an attachment on electrical discharge machining (EDM). The experimental results reveal that R-a increases with an increase of gap current and as well as d(f) but decreases with an increase of wheel RPM. Further, it also shows that the MRR rises with rise in wheel RPM, gap current, and t(on) but decreases as d(f) increases. After machining of cemented carbide workpiece by EDDCG process, the scanning electron microscope (SEM) micrographs of the machined surface were observed to study the combined effect of mechanical and electroerosion process.