| 摘要 |
PCT No. PCT/JP86/00374 Sec. 371 Date Mar. 16, 1987 Sec. 102(e) Date Mar. 16, 1987 PCT Filed Jul. 18, 1986 PCT Pub. No. WO87/00651 PCT Pub. Date Jan. 29, 1987.The invention relates to a method of creating a complex curved surface (CPS) comprising at least two three-dimensional curved surfaces (10a, 10b), particularly a method of creating a complex curved surface in which roundness is provided at a portion where first and second curved surfaces intersect. In the curved surface creation method, rounding is performed by obtaining normal vectors V1, V2 of first and second curved surfaces (10a, 10b) at a point of intersection P0 of first and second section curves (11, 12) obtained when the first and second curved surfaces are cut by a section (13) perpendicular to the XY plane, calculating an angle theta defined by V1xV2 and a normal vector v of the section (13), calculating R' in accordance with the equation R'=(1+1/¦cos theta ¦)xR/2 when roundness of radius R is commanded, and inserting a circular arc of radius R' at the portion where the first and second curved surfaces intersect. R' is the average value of the major axis (=R/¦cos theta ¦) and minor axis (=R) of an ellipse.
|
