Multi-optimisation of electric discharge machining parameters for cryogenically treated pure titanium using grey-Taguchi technique

In this paper, optimisation of process parameters using grey relational analysis (GRA) based on Taguchi approach in powder mixed electric discharge machining (PM-EDM) of cryogenically treated pure titanium with cryogenically treated electrodes considering multiple machining characteristics is reported. Material removal rate (MRR), tool wear rate (TWR), surface roughness (SR) and micro-hardness (MH) were identified as the EDM performance characteristics. Four input parameters chosen in the present study were peak current, pulse-on-time, different types of electrode material and cryogenic treatment (CT) of electrode materials. Shallow cryogenic treatment (SCT) and deep cryogenic treatment (DCT) were employed on electrode materials to study their effects on machining performance of DCT titanium. A suitable L9 orthogonal array (OA) was selected to assign the four parameters and thereafter, experiments were carried out accordingly. The analysis of variance (ANOVA) was applied to identify the most significant p...