Abstract
In case of the electrical discharge machining of insulating ceramics by an assisting electrode method, since the resistance of EDMed surface is very high, it is difficult to detect the contact between a workpiece and an electrode. Therefore, after the electrode comes in contact with the workpiece, the feed of the electrode continues, and the electrode and/or the workpiece will be broken. In this study, we control the torque of the main axis in order to keep stable machining. The results of electrical discharge machining to insulating SiiNt ceramics using this equipment are described. Furthermore, in order to improve the EDMed surface, polishing process was carried on the same machine. The electrical conductive layer on the EDMed surface could be removed by rotating tool with diamond abrasive.
