Parametric evaluation of PMEDM for the machining of inconel-800 using response surface methodology

Abstract

Electrically conductive materials are suitably machined with the aid of electrical discharge machining (EDM). But now a day’s it has limited applications because of the time-consuming machining rate. In the current scenario, its replacement is Powder Mixed EDM (PMEDM) in which fine particles mixed with EDM oil outcome in superior machining rates and improved surface value. The objective of this effort is to evaluate the performance of PMEDM by using Inconel-800 material. The MRR varied from 5.022 to 33.744 mm3/min. The micrographs show that, the most influencing parameters are current, Ton and electrode material which affect the integrity of the machined sample. In this work electrodes i.e. Cu, Cu-Cr and Gr have been chosen along with fine particles i.e. W4C, boron carbide and cobalt for optimization of MRR.Input parameters that we used are pulse off-time, pulse on-time, peak current, electrode and powder particles. Scanning Electron Microscope (SEM) is used to analyze the microstructure analysis.