Contact detection apparatus for wire electrical discharge machine with capability to vary applied gap voltage

摘要

A contact detection apparatus for a wire electrical discharge machine includes a voltage application unit adapted to apply a detection voltage to detect contact between a wire electrode and a workpiece; a contact determination unit adapted to determine contact or non-contact between the wire electrode and the workpiece based on changes in the detection voltage applied by the voltage application unit; and a voltage value changing unit adapted to change a voltage value of the detection voltage applied by the voltage application unit.

主权项

1. A contact detection apparatus for a wire electrical discharge machine, said apparatus comprising:
a voltage application unit configured to apply a detection voltage to detect contact between a wire electrode and a workpiece during non-machining periods; a contact determination unit configured to determine contact or non-contact between the wire electrode and the workpiece based on changes in the detection voltage applied by the voltage application unit; and a controller configured to change, during the non-machining periods, a voltage value of the detection voltage applied by the voltage application unit according to a property of the workpiece.