Controller for wire electric discharge machine

摘要

A controller for a wire electric discharge machine performing electric discharge machining by applying electric discharge pulse current between a wire electrode and a workpiece while said wire electrode and said workpiece are caused to move relative to each other. The controller includes discharge pulse current integrated value computing means (19) for integrating discharge pulse current applied every predetermined time; moving means for moving the wire electrode and workpiece relative to each other along a machining path on the basis of a moving command; and reference discharge pulse current integrated value memory means (20) for storing a time integrated value for discharge pulse current which is used as a reference. The controller determines a ratio of a numerical value obtained by the discharge pulse current integrated value computing means to a numerical value stored in said reference discharge pulse current integrated value memory means, and outputs, to the moving means, a distance value obtained by multiplying the relative moving distance between the wire electrode and workpiece to be determined by a preset feed speed and the predetermined time by the ratio as a moving command every predetermined time.