A Comparative Analysis of Surface Roughness in Single and Hybrid Powder-Mixed Electric Discharge Machining Process

Powder-mixed electric discharge machining (PMEDM) technique overcomes the limitations of conventional (Electric Discharge Machining (EDM) technique of low Material Removal Rate (MRR) and surface finish. But the powders used does not improve all of the response variables. So hybrid PMEDM technique is developed. In hybrid PMEDM, two or more powders are mixed together in varying proportion to improve multiple responses which cannot be achieved in single PMEDM process. In this work, a comparative study is conducted between conventional single PMEDM process and hybrid powder mixed EDM process with silicon, aluminium and chromium powder. It is found that surface finish is improved in case of hybrid PMEDM. © 2021 School of Science, IHU. All rights reserved.