Patent ID: 9541914
Date: 2017-01-10
CPC Classifications: B23H,G05B

Claim:
1. A wire electric discharge machine that performs machining by moving a wire electrode stretched between an upper wire guide and a lower wire guide relative to a table on which a workpiece is placed, the wire electric discharge machine comprising: a wire guide moving means for slanting the wire electrode at a predetermined angle; a contact detector disposed on the upper wire guide; a means for calculating a taper angle of a tapered section of a tapered workpiece mounted on the table, based on positions obtained through measurement, by the contact detector, of two points at arbitrary heights on the tapered section; and a means for calculating wire support positions of the upper wire guide and the lower wire guide that give a target taper angle and a target shape dimension, based on a position of any one of the two points measured, the calculated taper angle, the upper surface position of the workpiece obtained through measurement by the contact detector, and a position at which the tapered section and the upper surface of the workpiece intersect when there is no machining error.