Electric heating – Metal heating – Cutting or disintegrating
Patent
1997-07-31
1998-12-01
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
219 6913, 219 6917, 36447404, 409 80, B23H 720, B23H 702, B23H 504, B23H 900
Patent
active
058441913
ABSTRACT:
A method and a system for creating an improved cutting tool having a helical shaped cutting surface includes a computer, a computer numerically controlled milling machine and an electric discharge machine. The computer can be programmed to form the female shape of a helical spline of a cutting tool that extends longitudinally from the back of the tool to the front of the tool so that it is not parallel to a plane perpendicular to a longitudinal axis of the tool. Disposed along the spline may be a plurality of cutting teeth that each extend outward from the curved spline and have a cutting face that is curved in both a radial direction and in an axial direction with respect to the cutting tool. After forming the female shape of this spline, the computer can develop a cutting path for a tool of a numerically controlled milling machine and operate the milling machine to create an electrode having the female shape of the spline of the cutting tool. This electrode can be installed into an electric discharge machine that has a cutter blank loaded into the machine. The electric discharge machine can then be employed to form the male shape of the spline of the cutting tool.
REFERENCES:
patent: 3322185 (1967-05-01), Christenson
patent: 4490600 (1984-12-01), Rae
patent: 4793220 (1988-12-01), Yamamoto et al.
patent: 5014421 (1991-05-01), Swarden et al.
patent: 5091622 (1992-02-01), Ohba
patent: 5177689 (1993-01-01), Kinasi et al.
patent: 5377116 (1994-12-01), Wayne et al.
Illustrations of Turbine Rotor Cutting Tool manufactured by Precision Tool Works of Philadelphia, PA, (old design side view and old design looking from end) No Publication Date.
Abeles Daniel C.
Evans Geoffrey S.
Maire David C.
Westinghouse Electric Corporation
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