Abstract
This study deals with electrical discharge machining (EDM) characteristics of electrically conductive fine ceramics developed recently. Ceramics have been applied in various fields because of their many excellent mechanical, electrical and thermal properties. However, the machining into three dimensional shapes is difficult by conventional mechanical machining methods. In order to make it possible tomachine by EDM, many types of electrically conductive ceramics have been recently introduced into the market. However, EDM characteristics of such new ceramics have not yet made clear sufficiently. In this report, EDM characteristics such as removal rate, electrode wear and surface roughness of TiB_2 used as a metal mold material for lens and parts of electronic device are experimentally discussed. As a result, the electrode wear rate can be much reduced when the polarity of copper electrode is positive and the pulse duration is set to 100μs or more. Also, high speed EDM is possible when the polarity of graphite electrode is negative.
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