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Journal of Applied Sciences
Year: 2011  |  Volume: 11  |  Issue: 10  |  Page No.: 1784 - 1790

Machining of Cemented Tungsten Carbide using EDM

A.T.Z. Mahamat, A.M.A. Rani and Patthi Husain    

Abstract: In this study, we investigate the possibility of machining cemented tungsten carbide WC+6% Co by using copper. Tungsten carbide is hard and brittle with low thermal conductivity and low thermal expansion. The high resistant to abrasive wear and high melting point are the main reason for the selection of these materials for large number of applications such as machining tool and die material. The hardness of WC+Co primarily depends on the average grain size and cobalt content. The difficulty when machining cemented tungsten carbide comes from the thermal stress. The micro cracks enlarge, which leads to macro crack and fragmentation. This can be referred to the low thermal expansion, thermal conductivity and brittleness, which create a high thermal stress. Generally, cooling and removal of the cracked particles are difficult. In order to develop the optimal machining process for the desirable machining response, L9 Taguchi Orthogonal Array (OA) were used. This orthogonal array is used for optimization of the following variables; Peak-Current (IP), pulse ON-Time (ON), pulse OFF-Time (OFF) and Gap-Voltage (GAP). The results show that it’s possible to EDMing WC-Co using copper electrode at very low energy setting but at the expense of material removal rate MRR.

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