| 摘要 |
A flushing device having therein a chamber into which dielectric fluid is supplied for injecting dielectric fluid into a machining gap formed between a workpiece being machined and a wire electrode in a wire-cut electric discharge machine, a nozzle movable between a first position and a second position that is nearer the workpiece than the first position, for directing the dielectric fluid in the chamber toward the machining gap; and a spring or other bias apparatus for holding the nozzle in the first position. The spring constant of the spring or bias apparatus being such that during a first cut, when dielectric fluid is supplied to the chamber at a higher pressure, the force from the fluid pressure is sufficient to overcome the force of the spring or other bias apparatus, and the nozzle is caused to move to the second position; and during a skim cut, when the dielectric fluid is supplied to the chamber at a lower pressure, the force from the fluid pressure is insufficient to overcome the force of the spring or other bias apparatus, and the nozzle remains at the first position.
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