| 摘要 |
PROBLEM TO BE SOLVED: To solve problem of a conventional wire-cut electro-discharge machining method wherein a wire electrode is irregularly vibrated before a step position, and the breakage of the wire electrode is induced. SOLUTION: Before electro-discharge machining is performed, a machine is run idle while supplying a processing fluid jet of a predetermined set pressure toward the surface of a workpiece from upper and lower processing fluid jet nozzles. The load pressures of the processing fluid at the upper and lower processing fluid jet nozzles are properly detected, and stored in association with the relative positions thereof on a relative moving path. During the electro-discharge machining, based on the load pressure stored in a step portion, the processing conditions are changed and set stepwise to the processing conditions which meet the requirements of plate thickness and machining fluid jet supply state so that electro-discharge energy is gradually increased or decreased according to a change in the load pressure, and also changed and set to the plate thickness and machining fluid jet supply state so that the set pressure can be gradually increased or decreased according to a change in the load pressure. COPYRIGHT: (C)2011,JPO&INPIT
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