Material Removal Ratein Edm Of Ti-6al-4v)utilizing Copper As Electrode and Negative Polarity of Electrode

The traditional machining techniques are often incapable to machine the titanium alloy economically. Electrical discharge machining (EDM) is a relatively modern machining process having distinct advantages over other machining processes and can machine Ti-alloys effectively. This paper attempts to develop optimization model and investigate the effects of peak current, pulse on time and pulse off time on EDM performance characteristics of titanium alloy Ti-6Al-4V utilizing copper as electrode and negative polarity of the electrode. A mathematical model for correlating influence of process variables and the response of material removal rate is developed in this paper. The optimal machining set-up in favor of material removal rate is estimated and verified. Design of experiments (DOE) method and response surface methodology (RSM) techniques are implemented. Analysis of variance (ANOVA) has been performed for the validity test of the fit and adequacy of the proposed models. The obtained results evidence that the material removal rate increases with ampere and pulse on time and in contrast decreasing tendency is observed while the pulse off time increase. The result leads to desirable process outputs (MRR) and economical industrial machining by optimizing the input parameters.

M.M.Noor