Abstract
The machining characteristics of electric discharge machining (EDM) are dependent on various factors, namely work material, process parameters, electrode materials as well as the dielectric fluids. It is to be noted that the addition of semiconductive particles in dielectric fluid improves its properties by reducing the insulating strength of the dielectric fluid and increasing the spark gap between the tool electrode and workpiece. This mechanism results in a more stable process, higher metal removal, and good surface finish. In the present paper, an experimental investigation on the influence of various dielectric fluids namely paraffin, kerosene, distilled water, and transformer oil mixed with aluminum powder during EDM of EN-19 work material. Brass is used as the electrode material during the machining process. The effects of Al powder mixed dielectric fluid on the material removal rate (MRR), electrode wear rate (EWR), surface roughness (SR), and radial over cut (ROC) were measured at different levels of input given parameters like gap voltage (Vg), peak current (Ip), and pulse on time (Ton). From the experimental results, it is observed that the transformer oil is found to provide high MRR, surface finish, EWR, and ROC among all other dielectric fluids.
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