Optimisation of process parameters for gap current in wire electrical discharge machining
by Rohit Garg; Hari Singh
International Journal of Manufacturing Technology and Management (IJMTM), Vol. 25, No. 1/2/3, 2012

Abstract: Electrical discharge wire cutting, more commonly known as wire electrical discharge machining (WEDM), is a spark erosion process used to produce complex two- and three-dimensional shapes through electrically conductive work pieces by using wire electrode. The practical technology of the WEDM process is based on the conventional EDM sparking phenomenon utilising the widely accepted non-contact technique of material removal. In this paper, the various process parameters of WEDM like pulse on time (TO_ON), pulse off time (T_OFF),spark gap set voltage (SV), peak current (IP), wire feed (WF) and wire tension (WT) have been optimised to get their maximum impact on gap current (Ig) so as to obtain maximum material removal rate for hot die steel (H-11) material. Experimental investigation based on Taguchi's L-27 orthogonal array has been done. Signal-to-noise (S/N) ratio, analysis of variance (ANOVA) and various plots are generated to predict the optimal set of process parameters to maximise the gap current. The confirmation experiments have also been conducted to validate the results obtained by Taguchi technique.

Online publication date: Wed, 26-Nov-2014

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