| 摘要 |
PURPOSE:To aim at a sharp cut of non-cutting time by, first, establishing an awaiting point for each tool on a plural number of tool bench and second, selecting and ordering the first and the second tools to be used, respectively, in the first and second machine processing based on a program with the second tool awaiting at the established point while the first process is being performed. CONSTITUTION:A T4, which is a cutting off bit, it to be moved back to a point on the circumference of a circle Cb which is slightly larger than the diameter of a raw material (d) from the center of a raw material 1 (hereinafter referred to as the 'awaiting point'). Simultaneously, a first tool T1 to be used next is positioned by approaching toward the awaiting point by means of a rapid traverse and the tool T1 is further advanced to cut the raw material 1. In parallel with the advancing of the tool T1, the tool T4 is moved back using the rapid traverse method to a circumference of a circle Ca which is the extreme backdown position and, simultaneously, a tool T3, which is the second tool, is advanced to that extreme backdown position by the rapid traverse method. The non-cutting time used for tool exchanging can be sharply reduced by constantly selecting the tool to be used by a numerically controlled device to have the tool awaited at the awaiting point.
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