Wire electric discharge machine capable of detecting machining state
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United States of America Patent
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Mar 10, 2015
Grant Date -
Mar 1, 2012
app pub date -
Jun 2, 2011
filing date -
Aug 26, 2010
priority date (Note) -
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Abstract
A voltage is applied to a machining gap between a wire electrode and a workpiece for a period of one microsecond or less with a quiescent time longer than the duration of voltage application between each two adjacent cycles of voltage application provided, and the number of duty cycles and a machining-gap voltage are detected. An open-circuit state in which electric discharge does not occur after the voltage is applied is identified by the detected machining-gap voltage, and the number of open-circuits is counted. An average machining-gap voltage is obtained based on the numbers of duty cycles and open-circuits and the supply voltage or an average voltage for each duty cycle.
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