| 摘要 |
PCT No. PCT/JP89/00025 Sec. 371 Date Sep. 7, 1989 Sec. 102(e) Date Sep. 7, 1989 PCT Filed Jan. 11, 1989 PCT Pub. No. WO89/06391 PCT Pub. Date Jul. 13, 1989.There are provided a first machining method in which a tool (TL) is fed a predetermined amount (d) in a center direction of a blank to cut into the blank, after which the tool is fed in a cutting mode by an amount (W) corresponding to groove width longitudinally of the blank to perform grooving, and a second machining method in which the tool (TL) is fed in the center direction of the blank to perform machining down to the groove bottom (GB), after which the tool is raised to perform grooving. Based on data indicative of the shape of the tool used, it is decided whether to perform grooving down to the designated groove bottom (GB) by repeating the first machining method or perform grooving to a designated groove width by repeating the second machining method.
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