Wire break detecting device for wire electric discharge machine

Abstract

In electric discharge machining for intermittently applying voltage pulses between a wire electrode and a workpiece with quiescent periods interposed, test voltage for checking conduction between upper and lower power feeding elements is applied during quiescent periods. When there is no conduction, it is determined that the wire electrode is broken between the upper and lower power feeding elements.

Description

technical field [0001] The present invention relates to a wire electrode disconnection detection device of a wire electric discharge machine, which detects the disconnection of a wire electrode of a wire electric discharge machine. Background technique [0002] The wire electric discharge machine generates intermittent discharge between the wire electrode and the workpiece (between electrodes), and moves the wire electrode and the workpiece relatively according to the state between the electrodes, thereby removing and machining the workpiece. In order to generate the intermittent discharge, a series of operations of applying a DC current between electrodes and then inserting a rest time are repeated. [0003] The machining conditions are set at the time of machining, but if the setting is not appropriate, machining becomes unstable, and the wire electrode may break suddenly. Then, when a DC power source from a machining power source is applied to the wire electrode immediat...

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Problems solved by technology

However, in this technology, when the test voltage is superimposed on the machining voltage, a potential gradient is generated in the wire electrode, so there is a possibility that the machining result may be affected by fluctuations, etc.

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