Analysis of Machining Characteristics in Additive Mixed Electric Discharge Machining of Nickel-Based Super Alloy Inconel 718

Abstract

Additive mixed electric discharge machining (AEDM) is a recent innovation for enhancing the capabilities of electrical discharge machining process. The objective of present research work is to study the influence of operating process input parameters on machining characteristics of nickel-based super alloy (Inconel 718) in aluminium AEDM with copper electrode. The effectiveness of AEDM process on Inconel is evaluated in terms of material removal rate (MRR), surface roughness (SR), and wear ratio (WR) using one variable at a time (OVAT) approach. It is found experimentally that particle concentration and size significantly affect machining efficiency. Aluminium powder (325 mesh size) particles of concentration 6 g/l in AEDM produce maximum machining rate, minimum SR, and 4 g/l produces minimum WR within experimental conditions.