Kyocera Corporation

Ayano Negishi

Ryoma Nomiyama

A cermet insert includes a first surface, a second surface, a cutting edge, a third surface located opposite to the first surface, and a through hole extending from the first surface to the third surface. An inner wall constituting the through hole has, at least in a center portion, a binder-phase-rich layer having a higher binder phase content than an interior of the base. A thickness Tof the binder-phase-rich layer at the center portion is larger than a thickness Tof the binder-phase-rich layer at an end portion. The thickness Tis 1 μm or more and 20 μm or less, the thickness Tis 0.2 μm or more and 6 μm or less. The first surface includes a chip breaker. An arithmetic mean roughness Ra of the chip breaker is 0.05 μm or less when a cut-off value is 0.08 mm.

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Otsu, Japan

Ayano Negishi