WIRE ELECTRIC DISCHARGE MACHINE HAVING CORNER SHAPE CORRECTING FUNCTION

摘要

A wire electric discharge machine has a function of performing correction of corner shapes independently on an upper surface and a lower surface of workpiece. On the basis of the positions of upper and lower wire guides and the position and the thickness of the workpiece, the wire electric discharge machine calculates, on the upper and lower surfaces of the workpiece, a shape correction amount in a state in which there is a space between the upper nozzle and the upper surface of the workpiece and also in which there is a space between the lower nozzle and the lower surface of the workpiece, from a correction amount at the time when nozzles of the upper and lower wire guides are closely attached to the upper and lower surfaces of the workpiece. The wire electric discharge machine performs shape correction according to the calculated shape correction amount.

主权项

1. A wire electric discharge machine that stretches a wire electrode between upper and lower wire guides and relatively moves the wire electrode with respect to a workpiece on the basis of a machining program in order to perform electric discharge machining, the wire electric discharge machine comprising:
a reference-position storing unit configured to store, as a reference position, relative positions in a workpiece thickness direction of the upper and lower wire guides with respect to workpiece upper and lower surfaces and thickness of the workpiece in a state in which the upper and lower wire guides respectively approach the upper and lower surfaces of the workpiece; a correction-amount storing unit configured to store correction amounts for correcting shift amounts between wire guide coordinate positions on a machining program route in the reference position and actual machining positions on the workpiece upper and lower surfaces, with the shift being caused by wire bending during machining; a setting unit configured to set relative positions in the workpiece thickness direction of the upper and lower wire guides with respect to the workpiece upper and lower surfaces in any upper and lower wire guide positions and the thickness of the workpiece; a correction-amount calculating unit configured to calculate, on the basis of the reference position stored in the reference-position storing unit and the correction amounts stored in the correction-amount storing unit, correction amounts for correcting the respective shift amounts in the relative positions in the workpiece thickness direction of the upper and lower wire guides with respect to the workpiece upper and lower surfaces and the thickness of the workpiece set by the setting unit; and a wire-guide-position correcting unit configured to correct, on the basis of the correction amounts calculated by the correction-amount calculating unit, positions of the upper and lower wire guides in a relative movement command of a wire guide with respect to the workpiece commanded by the machining program, independently in an upper guide section and lower guide section.