INFLUENCE OF POWDER SUSPENDED DIELECTRIC ON MRR & SURFACE ROUGHNESS IN EDM
Keywords:
Powder mixed dielectric EDM, MRR, Surface Roughness, Powder characteristicsAbstract
EDM is a non traditional machining process used to machine complex shape electrically material irrespective to its hardness by removing material through electrically discharges in the presence of dielectric fluid. Powder mixed EDM is modified process which is used to improve surface roughness in addition to improvement in machining efficiency of the process .This process can be applied to fine finishing machining which eliminate post production surface treatment Powder mixed EDM has a different mechanism from the conventional EDM which can improve the surface roughness and higher resistance to corrosion because of the diffusion of electrode (tool) and/or powder into the machined surface. Various powders materials like Aluminium (Al), chromium (Cr), copper (Cu) & sililicon carbide (SCi) has its different effects on material removal rate and surface finish. An intensive study is carried on the investigation done by the different researchers in the field of Powder mixed EDM. This paper presents the different effects of various powders & their characteristics on the efficiency of EDM when used as suspended particles in dielectric fluid.. The mechanism of EDM in Powder suspended dielectric fluid is also discussed. This paper mainly focused on the effect of powder concentration, the particle size, the particle density, and the particle receptivity, thermal conductivity of powder along with other machining parameters on MRR and surface roughness are discussed. Highest surface finish & MRR can be achieved by selection of proper powder characteristics & optimum parameters.
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References
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