Patent ID: 8580376

Claim:
A culling tool, comprising: a sintered cermet, which contains a hard phase comprising one or more selected from among carbides, nitrides, and carbonitrides which comprise mainly Ti and contain one or more metals selected from among metals of Groups 4, 5, and 6 in the periodic table, and a binder phase comprising mainly at least one of Co and Ni; and a cutting edge which lies along an intersecting ridge portion between a rake face and a flank face, and comprises a nose lying on the cutting edge located between the flank faces adjacent to each other, wherein the hard phase comprises a first hard phase and a second hard phase, and when a residual stress is measured in the rake face by 2D method, a residual stress σ 11 [ 1 r ] of the first hard phase in a direction (σ 11 direction), which is parallel to the rake face and goes from the center of the rake face to the nose being the closest to a measuring point, is 50 MPa or below in terms of compressive stress (σ 11 [ 1 r ]=−50 to 0 MPa), and a residual stress σ 11 [ 2 r ] of the second hard phase in the σ 11 direction is 150 MPa or above in terms of compressive stress (σ 11 [ 2 r ]≦−150 MPa).