Abstract
Powder mixed Electric Discharge machining is a special type of EDM where powders are mixed with dielectric to enhance the responses like surface finish and material removal rate (MRR) of the work piece. In the present paper, experimental studies have been conducted on the powder mixed electrical discharge machining (PMEDM) for machining EN-19 alloy steel by using a 10 mm diameter cylindrical brass electrode. The aim of the present study is to investigate the effect of process parameters, namely peak current (Ip), gap voltage (Vg) and pulse on time on (Ton) on various responses like material removal rate (MRR), surface roughness (SR), tool wear rate (TWR) and radial overcut (ROC) when the dielectric is mixed with various powders such as aluminium, Graphite, Titanium carbide and multi walled carbon nanotube (CNT). Detailed analysis is carried out on the machined surface to study the effect of powders on machining process. It was observed that CNT powder resulted in higher MRR and better surface finish, whereas aluminium powder provided less TWR and ROC.
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