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Electrochemical Machining of Tungsten Carbide Microshaft  

Lee, Kang-Hee (동양미래대학 로봇자동화학부)
Publication Information
Journal of the Korean Society of Manufacturing Technology Engineers / v.19, no.3, 2010 , pp. 370-375 More about this Journal
Abstract
Tungsten carbide microshaft is used as micro punch, electrode of micro electro discharge machining, and micro tool because of its high hardness and rigidity. In this research, tungsten carbide microshaft was fabricated using electrochemical machining. $H_2SO_4$ solution was used as the electrolyte because it can dissolve tungsten carbide and cobalt simultaneously. Experimentally studied were the effects of electrolyte concentration, machining time, and machining voltage on material removal rate and the shape of the microshaft. To eliminate the effects of bubbles and metal corrosion layer on microshaft shape, the machining was performed below the electrolysis voltage. Three step electrochemical process was suggested to fabricate the straight tungsten carbide microshaft. As a result, a straight tungsten carbide microshaft of $30{\mu}m$ in diameter and $500{\mu}m$ in length was obtained through the proposed three step electrochemical process.
Keywords
Electrochemical machining; Electrolysis voltage; Electrolyte concentration; Tungsten Carbide microshaft;
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