抄録
A new machining method combining ELID, electrolytic in-process dressing, -grinding and EDM, electric discharge machining, is proposed in order to improve the productivity of precision curved-surfaces such as aspherical mirror. Since the wheel circumference under the ELID-grinding is covered with insulation materials, the electrodes made of graphite or Ag-W compound are inserted around the wheel periphery for EDM. During ELID-grinding, direct current is applied through the electrodes and a workpiece. When Ag-W plates are utilized for the electrodes, active but stable electric discharge have been observed at the grinding point, and grinding forces were successfully diminished in comparison with the conventional ELID-grinding. The roughness of the finished surface, however, deteriorates due to EDM. In order to obtain both machining efficiency and good surface finish, higher table speed is recommended and the down feed must be set slightly larger than the removal rate by EDM.
