Abstract
Abstract We investigate the removal mechanism of high-electric-resistivity materials in electrical discharge machining (EDM) processes by calculation of the workpiece temperature taking the Joule heating in the workpiece into account. The distribution of Joule heating inside the workpiece is calculated from the calculated electric potential distribution. Then considering both the heat flux from the arc column and the Joule heating, the time-dependent workpiece temperature is computed using the finite-difference method. From the computed temperature distribution it is found that the Joule heating causes a much greater temperature rise around the discharge spot in the machining of high-electric-resistivity materials than in the machining of metallic materials. This indicates that the removal of high-electric-resistivity materials in a single discharge is greater than that of metallic materials. However, it is found that a longer pulse interval is necessary to deionize the arc plasma and recover the insulation of the gap after each discharge, which results in a lower material removal rate in a series of pulse discharges.
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