Investigation into micro-hole geometrical accuracy during micro-EDM of Ti-6Al-4V employing different dielectrics
by G. Kibria; B. Bhattacharyya
International Journal of Machining and Machinability of Materials (IJMMM), Vol. 10, No. 4, 2011

Abstract: Micro-electrical discharge machining (micro-EDM) is a non-contact type advanced machining process (AMP) in which removal of material from workpiece takes place by thermo-erosion mechanism between the micro-tool and workpiece within a small gap. The present study attempts to make comparative investigation of micro-hole machining process in EDM for using three different dielectrics such as pure kerosene, pure de-ionised water and boron carbide mixed kerosene and de-ionised water. The two most important process parameters, i.e., peak current and pulse-on-time were varied keeping other parameters as constant. The experimental results revealed that B₄C mixed dielectrics result in non-uniformly circular micro-holes compared to pure kerosene and de-ionised water. Moreover, when de-ionised water is used, powder mixed dielectric results in generation of accurate micro-hole with respect to taper and circularity. Analysis has also been made with the help of optical and SEM micrographs to show the influence of different dielectrics on the micro-hole geometrical accuracy, i.e., hole taper and circularity.

Online publication date: Tue, 30-Dec-2014

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