An investigation into surface roughness of work piece produced by chromium powder suspended dielectric in PMEDM process

In this research article, an investigation of surface roughness (SR) of work surfaces produced by the powder mixed electrical discharge machining of EN-8 steel has been carried out. Response surface methodology has been used to plan and analyse the experiments. Average current, duty cycle, electrode angle and concentration of chromium powder added into the dielectric fluid were selected as process parameters. Experiments have been performed on a newly designed experimental set-up developed in the laboratory. An empirical model has been developed for surface roughness. In addition, the recommended model has been verified by conducting confirmation experiments. [Received 14 May 2015; Revised 14 April 2016; Accepted 8 June 2016]