| 摘要 |
PCT No. PCT/JP88/00386 Sec. 371 Date Dec. 12, 1988 Sec. 102(e) Date Dec. 12, 1988 PCT Filed Apr. 20, 1988 PCT Pub. No. WO88/08560 PCT Pub. Date Nov. 3, 1988.The invention relates to an NC data creation method for machining a curved surface (101) having a cutting boundary surface (102) in the depth direction. Data specifying the three-dimensional curved surface (101) and the curved surface (102) of a cutting boundary in the depth direction are inputted. When the three-dimensional curved surface (101) is defined by a set of a plurality of point-sequence paths (11i), a point sequence Q(i,j) of a tool nose corresponding to a point sequence A(i,j) is determined. Next, there is determined a projected point sequence B'(i,j) obtained by projecting the point sequence Q(i,j) of the tool nose onto a reference plane (103), as well as a projected point sequence C(i,j) obtained by projecting the first-mentioned projected point sequence onto the curved surface (102) of the cutting boundary. Thereafter, a check is performed to see whether a line segment connecting the point sequence Q(i,j) of the tool nose and a line segment connecting the projected point sequence C(i,j) on the curved surface of the cutting boundary intersect. If they do intersect, NC data up to the point of intersection P(i,j) are created. NC data are subsequently created in the same manner upon performing a pick-feed.
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