Multi Response Optimization of Proces Parameters in Electrical Discharge Machining Using TOPSIS

Electrical Discharge Machining (EDM) is identified for machining difficult to machine materials. This paper proposes an approach to study the influence of electrical discharge machining process parameters on Taper, Radial over cut (ROC), Material removal rate (MRR) in machining of the AA 6061-TiB₂ in-situ metal matrix composite fabricated by flux assisted synthesis. Pulse on time, pulse off time and current are considered as process parameters. AA 6061-TiB₂ composite was machined by EDM process using a copper electrode and kerosene is used as a dielectric fluid. Multi criteria decision making technique named Technique Ordered Preference by Similarity to the Ideal Solution (TOPSIS) was used to find out the optimum process parameters. The optimum levels of machining parameters are found to be pulse on time 90μs, pulse off time 3μs and discharge current 30 Amps.