Electric heating – Metal heating – Cutting or disintegrating
Reexamination Certificate
2008-05-13
2008-05-13
Evans, Geoffrey S. (Department: 1793)
Electric heating
Metal heating
Cutting or disintegrating
Reexamination Certificate
active
07371989
ABSTRACT:
A wire electric discharge machine capable of taper machining with an improved accuracy. A reference wire correction amount d set in advance is determined to be a proper value for a wire-diameter correction amount for a speed control plane, and adjustment amounts for adjusting the reference wire correction amount for the upper and lower surfaces of a workpiece are determined to be proportional to (1-Lu/Lm) and (1-Ll/Lm), respectively, where Lu, Lm and Ll are machining distances at the upper surface, speed control plane and lower surface, respectively. As a proportionality coefficient, a reference adjustment amount e is set in advance. Using adjustment amounts e(1-Lu/Lm) and e(1-Ll/Lm), wire-diameter correction amounts for the workpiece upper and lower surfaces are determined to be d+e(1-Lu/Lm) and d+e(1-Ll/Lm). When a workpiece setting table and upper and lower wire guides are driven, axes are controlled so that a wire electrode follows, on the workpiece upper and lower surfaces, paths shifted by the wire-diameter amounts, respectively.
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European Search Report issued Dec. 21, 2007 in corresponding European Patent Application No. 06254939.9-1262.
Arakawa Yasuo
Miyajima Keiichiro
Evans Geoffrey S.
Fanuc Ltd
Staas & Halsey , LLP
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