Application of utility concept approach for multi-response optimisation of wire electrical discharge machining during profile cutting of Inconel-625
by Sachin Ashok Sonawane; Mahesh Laxmikant Kulkarni
International Journal of Machining and Machinability of Materials (IJMMM), Vol. 20, No. 1, 2018

Abstract: This research study investigates the effects of machining factors such as on pulse-on time, pulse-off time, servo voltage, peak current, wire feed rate and wire tension on kerf widths at different locations on the profile, i.e., at straight cut, at an angle 90°, 70° and 30° along with surface roughness, overcut, MRR and surface topography of the machined surface while WEDM of Inconel-625. Taguchi's L₂₇ orthogonal design was applied for the planning of experiments. The utility concept was used to translate the multi-response problem into a single equivalent response called overall utility index. Pulse on time was observed as the prime factor affecting the overall utility index. Surface topography of the machined samples shows craters, debris deposited on the machined surface and micro-cracks. This paper reports machining of the complex profile on Inconel-625 and optimisation of machining factors which will be helpful for the manufacturing industries to manufacture complex patterns.

Online publication date: Fri, 26-Jan-2018

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