Abstract
It is very challenging to machine high aspect ratio and complex-shaped holes with micro-electrical discharge machining process. Micro-hole drilling plays a vital role in the production of various aspect ratio (length/depth) micro-holes. This work presents an attempt to fabricate high aspect ratio micro-holes using micro-EDM process on a brass workpiece with tungsten carbide electrode. In the present study, the effect of different machining and operating parameters, namely, spindle speed, feed, input voltage and capacitance on the performance of micro-EDM process is studied. The performance of micro-EDM process is evaluated on the basis of material removal rate (MRR) and the tool wear rate (TWR). It was found that there is significant effect of capacitance and feed on the MRR. The MRR improved with increasing values of capacitance and feed rates, while the TWR decreases with increasing discharge energy (capacitance and voltage).
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