Abstract
It is known that only several percent of the meltpool in the discharge crater is removed as debris in electrical discharge machining (EDM). Hence, machining rate would be improved and thickness of the damaged layer would be decreased if most of the molten material could be removed. In the previous researches, it was found that the removal volume of single pulse discharge, machining rate of continuous pulse discharges, and tool wear are significantly influenced by the rising and falling speeds of the discharge current pulse. In the previous researches however, the influences of the pulse shapes were investigated under a limited machining condition. Machining characteristics of these pulse shapes have not been compared under different machining conditions. This study shows that the most efficient pulse shape can be different if the discharge duration and discharge current are changed. The reason why the optimum pulse shape depends on the machining conditions is discussed.
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