| 摘要 |
PURPOSE:To prevent generation of thermal strain by covering a reference surface board for fixation of a work partially or in the whole with platings or metallization of a material which has a smaller specific resistance value than the material of the surface board, and thereby preventing heat emission by high-frequency pulse current flowing at the surface. CONSTITUTION:A work to be machined 12 is fixed to a reference surface board 21, and high-frequency pulse current is applied through an interpole wiring cord 16, upper guide 5, wire electrode 1, and the surface of reference board 23, wherein electric discharge is made repeatedly between the mating minute gaps through the processing liquid as a medium, when fused spattering will be made with the thermal energy at electric discharging. The surface of said reference surface board 21 is covered with material with high electroconductivity such as copper, aluminum, copper alloy, and aluminum alloy through platings, metallization, sheet coatings. Accordingly heat emission due to high-frequency current flowing at the surface of reference board 21 will be small to contribute to prevention of the reference board 21 from thermal strain.
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