| 摘要 |
PURPOSE:To enable griding and cutting with high accuracy in a short time by forming discharge bands and polishing bands on the peripheral surface of a disc in such a manner that an electric griding and a mechanical griding are laternately repeated to a non-conductive material to be ground. CONSTITUTION:In an electrolytic discharge machining method using a grinder having a conductive portion, electrodes of a voltage supply device E are connected to a disc 1 and a non-conductive material M to be ground. The disc 1 is rotated at high speed and electrolyte is supplied, so that a DC current of a fixed voltage is applied between the disc 1 and the material M. A solution of 1 to 2% of electrolyte NaNO3, NaCl, KNO3 or the like is used. Discharge bands 11 and polishing bands 12 are alternately brought into contact with the non- conductive material M with a short-time time lag by high-speed rotation of the disc 1 to generate pulses, so that electrolytic discharge is advanced by dielectric action. Thus, griding and cutting can be performed with high accuracy in a short time. |
