| 摘要 |
<p>A wire electric discharge machine comprising contact point output means 2 for outputting a point of time at which a wire electrode and an end face of a workpiece contact each other, supply stable state point output means 3 for outputting a point of time at which the supply of machining liquid to a machining position of the wire electrode is stabilized, and modifying means 1 for modifying the machining conditions of the wire electric discharge machine in accordance with the outputs of the contact time output means and supply stable state point output means, wherein the machining conditions is automatically modified at the point of time at which the wire electrode and the end face of the workpiece contact each other which is detected by measuring the voltage between the wire electrode and the workpiece; the machining conditions are modified to conditions providing lower power at the time of the contact; the distance of the wire electrode from the end face of the workpiece is detected and compared with a preset distance; in accordance with the comparison result, a point of time at which the supply of the machining liquid to the machining position of the wire electrode is stabilized is set; and the modified machining conditions are restored to original conditions at the time of stabilization, whereby, even when machining operation has to be started from a state in which the supply of the machining liquid is insufficient such that the machining operation has to be started with the wire electrode located at a peripheral edge of the workpiece, the machining operation can be stably started by means of automatic modification of the machining conditions. <IMAGE></p> |
