Abstract
This work investigates the feasibility of applying die sinking electrical discharge machining (EDM) for blind hole drilling of carbon fibre reinforced composite (CFRC) materials. Both carbon fibre reinforced polymers as well as carbon-carbon composites were tested. Machining was performed with copper electrodes, at various currents, pulse durations and polarities. The machined surfaces are evaluated in terms of dimensional accuracy, material removal rate and surface roughness and are also examined by microscope. Research indicates that EDM is a feasible method for blind-hole drilling of CFRC materials however; proper selection of operational parameters is needed. Optimal results are, in general, obtained by low pulse currents and pulse durations and by using tool with positive polarity.
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