Patent ID: 9643257
Date: 2017-05-09
CPC Classifications: B23B,C23C,Y10T

Claim:
1. A cutting tool, comprising a base body whose surface is coated with a coating layer made of Cr a M 1-a (C 1-x N x ) (here, M is at least one element selected from Ti, Al, Si, W, Mo, Ta, Hf, Nb, Zr, and Y, 0.01≦a≦0.4, and 0≦x≦1), wherein a cutting edge is formed on an intersection ridgeline between a rake face and a flank face, wherein the coating layer contains Ti and Al, wherein an Al content ratio of the coating layer for the rake face is greater than an Al content ratio of the coating layer for the cutting edge and is smaller than an Al content ratio of the coating layer for the flank face, and wherein a Cr content ratio of the coating layer for the rake face is smaller than a Cr content ratio of the coating layer for the cutting edge and is greater than a Cr content ratio of the coating layer for the flank face.