SURFACE-COATED CUTTING TOOL

Japanese Patent JP2018202505

A

To provide a surface-coated cutting tool which exhibits an excellent defect resistance in a high speed and high efficiency processing with a high heat load.SOLUTION: A coating sheet formed on a base material includes a lamination layer structure in which an A layer 2, a B layer 3, a C layer 4 and a D layer 9 are repeatedly laminated in this order. Each of the A layer, the B layer, the C layer and the D layer is a nitride of at least two or more kinds of elements selected from a group comprising a group 4 element, a group 5 element, a group 6 element, Al, Si, B and Y, a lattice constant of the A layer L, a lattice constant of the layer B L, a lattice constant of the C layer Land a lattice constant of the D layer Lsatisfy a relationship of L