CUTTING TIP OF CUTTING EDGE REPLACEMENT TYPE

摘要

A cutting tip of the cutting edge replacement type (1) characterized in that: it comprises a base (8) and coating layers; the coating layers comprise inner layers and an outer layer; the inner layers each is a specific layer containing at least one element selected from the group consisting of the elements in Groups IVa, Va, and VIa of the Periodic Table, Al, and Si; the uppermost layer of the inner layers, which is in contact with the outer layer, is made of a compound comprising at least titanium and one or the two elements selected between nitrogen and boron; the outer layer is an alumina layer or a layer containing alumina; and that part of the outer layer which participates in cutting satisfies the relationship B/A=0.9, wherein A (µm) is the average thickness on the flank surface (3) side and B (µm) is the average thickness on the rake surface (2) side.