Optimization of WEDM Process Parameters on Machining of AZ91 Magnesium alloy using MOORA method

Selection of optimum machining parameters in wire electrical discharge machining (WEDM) operations leads to good functional attributes for the machined components and increased productivity. In this present experimental work, the effect and advancement of machining control parameters over kerf and cutting speed in wirecut electrical discharge machining operations were analyzed. Multi objective optimization by ratio analysis (MOORA) applied for optimization of kerf width (KW) and cutting speed (CS). Magnesium AZ91 alloy is selected as work material of dimension 100 x 100 x 10 mm. The analyses were outlined with Taguchi L27 design matrix. WEDM parameters resemble Pulse on time, Pulse off time, current, gap voltage, wire speed & wire tension are considered. The effect of the cutting control parameters on the kerf width and cutting speed is directed by using examination of fluctuation. The parameters corresponding to experiment run number 2 are pulse on duration 106 units (Level 1), pulse off duration40 units (Level 1), peak pulse current 150 units (Level 2), gap voltage30 units (Level 2), wire feed 6 units (Level 2) & wire tension 8 units (Level 2) are the best combination to achieve better CS and KW. (paper)