Electric heating – Metal heating – Cutting or disintegrating
Patent
1985-12-04
1987-12-15
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
318570, B23H 706, G05B 19415
Patent
active
047135174
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a cut contour display method in a wire electric discharge machine. More particularly, the invention relates to a cut contour display method in a wire electric discharge machine for displaying wire electrode paths lying on the upper and lower surfaces of a workpiece, along with a plurality of cross-sectional contours obtained by cutting a taper cut surface by a plurality of planes parallel to the lower surface of the workpiece.
In numerically controlled machining, including wire electrical discharge machining, the common practice is to display the machining path determined by the NC program on a display unit, such as a cathode ray tube (CRT), before actual machining takes place, check the program based on the display and then start the numerically controlled machining operation. In wire electric discharge machining, wherein a wire electrode path on either the upper or lower surface of the workpiece is commanded as the programmed path, the practice in the prior art is to display only the wire electrode path lying on the upper or lower workpiece surface, which constitutes the programmed surface, when the program check is performed.
In a case where taper cutting is carried out by a wire electric discharge machine, however, the contour cut on the upper surface of the workpiece and the contour cut on the lower surface of the workpiece differ. As a result, the taper-cut contour cannot be fully comprehended merely by displaying solely the contour of one surface, namely the upper or lower surface of the workpiece. This constitutes a hindrance to the program checking operation.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a cut contour display method in a wire electric discharge machine, whereby a taper-cut contour can be comprehended with ease and a program checked in a simple manner.
Another object of the present invention is to provide a cut contour display method in a wire electric discharge machine, wherein cut contours on the upper and lower surfaces of a workpiece, namely the wire electrode paths on the upper and lower surfaces of the workpiece, can be displayed on a display unit together with a plurality of cross-sectional contours obtained when a taper-cut surface is cut by a plurality of planes lying parallel to the lower surface of the workpiece.
The present invention provides a cut contour display method in a wire electrical discharge machine for subjecting a workpiece to taper cutting by moving a workpiece relative to a wire electrode and moving a wire tensioning guide horizontally. The method includes a step of entering a programmed path lying on the upper or lower surface of the workpiece, the thickness of the workpiece, a taper angle in each block or a vector indicative of an offset between the upper and lower surfaces of the workpiece at the end of the block, and data specifying a number of cross-sectional contours obtained by cutting a taper-cut surface into a plurality of planes lying parallel to the lower surface of the workpiece; a step of obtaining a wire electrode path on whichever one of the upper and lower surfaces of the workpiece is not a programmed surface by using the programmed path, workpiece thickness, taper angle or vector indicative of the offset between the upper and lower surfaces of the workpiece at the end of the block; a step of obtaining coordinate values of points on each cross-sectional contour at an end portion of each block by using the wire electrode paths on the upper and lower surfaces of the workpiece and the number of cross-sectional contours; and a step of displaying, on a display unit, the wire electrode paths on the upper and lower surfaces of the workpiece as well as each cross-sectional contour by using wire electrode path data for upper and lower surfaces of the workpiece and the coordinate values of the points on each cross-sectional contour at the end portion of each block. According to the present invention, the taper-cut contour can be comprehended with facili
REFERENCES:
patent: 4332995 (1982-06-01), Ito et al.
patent: 4546427 (1985-10-01), Kishi et al.
patent: 4559601 (1985-12-01), Kishi et al.
Evans Geoffrey S.
Fanuc Ltd.
Pellinen A. D.
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