| 摘要 |
<p>PCT No. PCT/JP82/00093 Sec. 371 Date Nov. 26, 1982 Sec. 102(e) Date Nov. 26, 1982 PCT Filed Apr. 1, 1982 PCT Pub. No. WO82/03353 PCT Pub. Date Oct. 14, 1982.A numerical control machining method and apparatus wherein a workpiece (101) is machined on the basis of curved surface data defining a curved surface. In the numerical control machining method and apparatus, a first boundary surface (103) serving as an upper limit and a second boundary surface (104) serving as a lower limit are respectively entered as inputs. A determination is made whether a tool lies in an upper part with respect to the first boundary surface (103), between the first and second boundary surfaces, or in a lower part with respect to the second boundary surface (104), and only the curved surface (CA1) enclosed by the first boundary surface (103) and the second boundary surface (104) is machined on the basis of the curved surface data. Then first and second boundary surfaces (103, 104) are moved downwards by predetermined values and the tool is moved by rapid traverse to a position (P12) corresponding to the first boundary surface (103'). After the completion of the machining of the curved surface (CA1) enclosed by the first and second boundary surfaces the next cutting operation is started from the position (P12).</p> |
