Abstract
Abstract As a thermal machining process, Electro-Discharge Machining (EDM) provides a means of machining ceramic materials, irrespective of their hardness and strength, provided that their electrical conductivity values are of the order of 0.01 S/cm (100 Ω*cm), as is sometimes the case with engineering ceramics. EDM achieves high removal rates as compared with traditional techniques for the machining of these materials. The lack of correlation between the cutting rate, the surface roughness and the physical material parameters confirms that the removal mechanisms for machining conductive ceramics differ from those involved in metal machining. In order to ensure process stability, the grain structure evinced by the ceramic must be as fine and homogeneous as possible. The complex workpiece geometries and high accuracy to shape and size attainable with electro-discharge machining particularly favour its use in toolmaking.
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