To provide a cutting insert capable of preventing a crack from reaching up to the another main surface, when the crack is generated on a side surface, the crack being caused by chipping of a one main surface side cutting edge, and to provide a cutting tool.
A cutting tool comprises a cutting insert 4 detachably held by a holder. The cutting insert 4 is formed in a substantially square shape in a plan view, and includes four R-shaped corner parts 4a. The cutting insert 4 is formed of a CBN sintered body as a whole. The cutting insert 4 is composed of two main surfaces 6 becoming mutually opposed upper-lower surfaces and four side surfaces 7 arranged so as to mutually connect respective main surfaces 6. Boundary parts (ridgeline parts) between the respective main surfaces 6 and the respective side surfaces 7, form cutting edges 8. A crack absorbing approximately cross-sectional V-shaped groove part 10 recessed relative to the side surfaces 7 is formed over the whole periphery of the cutting insert 4 in a central part of the respective side surfaces 7 of the cutting insert 4.
KOROGI YOSUKE
WATABE NAOKI
TSUKIHARA NOZOMI
YONEKURA HIROKI
| JPH05285708A | 1993-11-02 | |||
| JP2012035341A | 2012-02-23 |
Yoshiki Kuroki
Ichira Kondo