SURFACE-COATED CUTTING TOOL

摘要

Wear resistance and chipping resistance are both highly established for a surface-coated cutting tool (1). The surface-coated cutting tool (1) of the present invention includes a base material (7), and a coat film formed on the base material (7). A first coat layer (8) at a chamfer portion (4) has residual stress that exhibits a minimal value at a depth A within 2 µm from the surface, and that is greater than or equal to -7 GPa and less than or equal to -1 GPa. The first coat layer(8) at a portion other than the chamfer portion (4) has residual stress that increases continuously or stepwise as a function of advance in the central direction of the rake face and the central direction of the flank face, and that is greater than or equal to 0 GPa and less than or equal to 2 GPa. In the first coat layer (8), the region further deeper in the depth direction from depth A at the chamfer portion and the region other than the chamfer portion (4) is a rough crystal texture region (9) including crystals larger than the crystals in a fine crystal texture region (10).