CUTTING EDGE REPLACEMENT-TYPE CUTTING CHIP

摘要

This invention provides a cutting edge replacement-type cutting chip (1), characterized in that it comprises a base material (8) and a covering layer, the covering layer comprises an inner layer and an outer layer, the inner layer comprises an alumina layer or an alumina-containing layer as the uppermost layer in contact with the outer layer, the outer layer is formed of at least one metal selected from the group consisting of group IVa elements, group Va elements, and group VIa elements of the periodic table, Al and Si, or a compound comprising this metal and at least one element selected from the group consisting of carbon, nitrogen, oxygen, and boron, and, at a site involved in cutting, a requirement of B/A = 0.9 is satisfied wherein A represents the average thickness on a flank (3) side, µm; and B represents the average thickness on a front face (2) side, µm.