DOI: 10.5176/2251-1857_M312.63
Authors: U. K. Vishwakarma, A. Dvivedi, P. Kumar
Abstract: During electrical discharge machining (EDM) dielectric fluid, between the tool and workpiece electrodes, helps in formation of plasma channel and also flushes away the eroded particles. Further, it carries out heat generated during machining and thus controls thermal damage. As machining proceeds, the concentration of debris increase and in the absence of proper flushing the frequency of discharges decrease, causing reduction in material removal rate (MRR) and deteriorate the surface quality. Rotary tool EDM (REDM) becomes advantageous in terms of debris removal by centrifugal force, thus improves flushing condition. In present investigation, Al-SiC metal matrix composite (MMC) has been machined by REDM process and effect of different process parameters, namely discharge current, gap control, duty factor, electrode rotation speed and flushing pressure, have been analyzed in terms of MRR and tool wear rate (TWR) using response surface methodology (RSM). The effective flushing in the machining gap provided by electrode rotation remarkably improves the surface quality with less tool wear.
Keywords: Rotary tool EDM, MRR, TWR, RSM
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