| 摘要 |
An indexable type rotary cutting tool (1) has at least one indexable inserts (3, 6). The indexable insert (3, 6) has a main cutting edge (7) and an outer peripheral cutting edge (9). The main cutting edge (7) ranges from 3 to 35 degrees in cutting edge angle, and the main cutting edge (7) is shaped like and arc or a substantially arc, and the outer peripheral cutting edge (8) is shaped like a straight line, an arc, or a substantially arc so as to be back-tapered with respect to a center axis of the tool.
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