THREE DIMENSIONAL MACHINING METHOD

摘要

PROBLEM TO BE SOLVED: To produce a smooth curved surface by integrating a different type of graphic information produced in another system into a formula of a curved surface, in three dimensional machining to be carried out by a programmed computer using a milling machine, etc. SOLUTION: A method for carrying out three dimensional machining for a workpiece by a programmed computer using a cutting tool of which the cutting surface has a quadratic surface of revolution, such as an ellipse, a sphere. A plurality of curved surfaces based on a plurality of different types of graphic information (including an expression defining a curved surface) representing a curved surface and a curve are defined by a unified expression of variables (u), (v). A central travelling point of the cutting tool having tip radii rp, rnis obtained with respect to a normal vector N at a point S(u, v) calculated by the unified expression. COPYRIGHT: (C)2003,JPO