Wire electric discharge machining apparatus

A wire electric discharge machining apparatus that generates discharge between a wire electrode and a workpiece and moves the wire electrode and the workpiece relative to each other to perform discharge machining with respect to the workpiece, the apparatus comprising:

• a corner speed controller that controls a machining speed for each wire center trajectory in a corner portion, according to an amount of machining estimated for the corner portion formed by changing a direction of relatively moving the wire electrode, when the wire electrode is moved on the wire center trajectory, which is offset from a programmed trajectory prestored to obtain a desired machining shape, to perform finish machining in each of machining stages with an offset amount being changed;
• and
• a machining-condition correcting unit that corrects machining conditions in each of the machining stages corresponding to a circular arc radius of a portion corresponding to the corner portion of the programmed trajectory, with respect to machining according to the machining speed calculated by the corner speed controller.