CPC B23B 27/1611 (2013.01) | 20 Claims |
1. An insert, comprising a base which is a cermet comprising hard particles and a binder phase, wherein
the base comprises
a first surface,
a second surface,
a cutting edge located on at least a part of a ridge line of the first surface and the second surface,
a third surface located opposite to the first surface, and
a through hole from the first surface to the third surface,
an inner wall constituting the through hole comprises a binder-phase-riched layer having a higher content of the binder phase than an inside of the base, at least in a center part,
a thickness T1 of the binder-phase-riched layer in the center part is larger than a thickness T2 of the binder-phase-riched layer in an end part of the inner wall, and
the thickness T1 is 1 μm or more, and 20 μm or less.
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