Wire electric discharge machine

Details Wire electric discharge machine Wire electric discharge machine

2006-02-14

2006-02-14

Evans, Geoffrey S. (Department: 1725)

Electric heating

Metal heating

Cutting or disintegrating

C700S162000

Reexamination Certificate

active

06998561

ABSTRACT:
A wire electric discharge machine capable of preventing a straightness error from being caused by consumption of a wire electrode, to eliminate insufficient machining. A correction angle φ is predetermined for preventing the straightness error of the workpiece due to consumption. Correction amounts d1′, d2′ on a program plane and an upper surface of a workpiece, respectively, are determined based on the predetermined correction angle φ, and are added to or substracted from a predetermined offset amount depending on a wire electrode radius and an electric discharging gap, to determine corrected offset amounts d1, d2on the program plane and the upper surface of the workpiece, respectively. Correction amounts dlo, dup for lower and upper wire guides in an offset direction are obtained based on the corrected offset amounts d1, d2, respectively, so that motion paths of upper and lower wire guides relative to the workpiece are determined.

REFERENCES:
patent: 4703146 (1987-10-01), Kinoshita
patent: 4843203 (1989-06-01), Gamo et al.
patent: 63-120030 (1988-05-01), None
patent: 63-120030 (1988-05-01), None
patent: 4-105820 (1992-04-01), None
Notice of Grounds of Rejection for corresponding Japanese Application No. 2002-310024 mailed Oct. 26, 2004.

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