Pragmatic Deliberation of Powder Mixed EDM In Favor of MRR & Surface Finish of EN 8 Material

Electrical discharge machining is a technological process use, when very complex shapes on hard materials with a high geometrical and dimensional accuracy are required. Material removal rate and surface finish are most important output parameters, which decide the machining performance. Present study attempts to optimize the process on the powder mixed electrical discharge machining (PMEDM) of En-8. In the PMEDM process, the powder particle suspended in the dielectric fluid disperses and makes the discharging energy dispersion almost uniform; it displays multiple discharging effects. Also the plasma channel becomes enlarged and widened. This phenomenon improves results in both MRR and surface finish. ANOVA analysis carried out which conclude that current is the main factor which contributes much more, but the contribution of concentration is also considerable. Here the value of MRR is improved from 41.15 mm3/min (in conventional EDM) to 45.64 mm3/min in powder mixed EDM. Also surface roughness is improved from its minimum value in conventional EDM 7.12 µm to 6.93 µm.