Effect of Dielectric on Electrical Discharge Machining: A Review

In the present study a comprehensive work has been carried out to investigate the influence of dielectric on machining parameters of EDM process. An EDM is a non- traditional thermo- erosive process used to machine a materials irrespective of their hardness. It produced a highly précised and better surface topography in materials. Dielectric is an important parameter in EDM and plays a crucial role in determining high material removal rate (MRR) and surface finish during operation. The dielectric fluid behave as a medium which controls the electrical discharge and absorb heat during process. It remove the debris particles and cool the work-piece. Adding of powder such as Ti, Si, graphite, Cu, Al₂O₃ etc. in dielectric fluid increases the fluid conductive nature with an increase in micro-hardness of material. Selecting suitable dielectric from different present fluids is highly essential for conducting experiment in EDM. This paper presents the literature views of use of different dielectrics and its effect on optimization of machining parameters and respective characteristic properties.