| 摘要 |
A plunge-cutting forming tip which improves chip disposal. A protrusion (11) is disposed on a rake face (7) in the vicinity of the ridgeline of a plunge-cutting edge (3). In cutting by means of the tip (1), a chip (K) is ejected which is not only merely thin, but also is ejected in such a manner as to be partially squeezed as a result of pressing against the protrusion (11). Accordingly, the chip is ejected such that a cross section thereof is deformed into a channel shape instead of assuming a flat shape. Thus, the rigidity of the chip is increased, so that chip disposal is improved accordingly.
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