Abstract
Investigations were conducted on the machining of AISI D2 tool steel via Conventional electrical discharge machining (CEDM) and Cryogenic cooled electrode in electrical discharge machining (CCEDM). Machining parameters, including discharge current, pulse on time, and gap voltage, were varied to investigate their effects on machining performance such as on Electrode wear ratio (EWR), surface roughness (Ra), microstructure, surface morphology, and elemental composition. Experimental results showed that EWR was reduced by 20% in CCEDM compared with in CEDM. Moreover, the Ra in CCEDM decreased by approximately 19% compared with that in CEDM. The results also indicated that the surface morphology of the workpiece machined via CCEDM was better than that of the workpiece machined via CEDM. Lastly, the damaged layer and microcracks were less in the workpiece machined via CCEDM than those in the workpiece machined via CEDM.
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