Patent ID: 11938547
Assignee: SUMITOMO ELECTRIC HARDMETAL CORP.
Field: Surface technology, coating (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A turning tool used for turning, the turning tool comprising: a holder portion; and a cutting edge portion fixed to the holder portion, wherein
the cutting edge portion is composed of a synthetic single-crystal diamond,
the synthetic single-crystal diamond is a CVD single-crystal diamond,
the CVD single-crystal diamond includes more than or equal to 1 ppm and less than or equal to 100 ppm of hydrogen,
the cutting edge portion includes a rake face, a flank face, and a cutting edge disposed at a crossing portion at which the rake face and the flank face cross each other, and the cutting edge portion has a nose curvature having a curvature radius of more than or equal to 0.1 mm and less than or equal to 1.2 mm, and
the nose curvature satisfies at least one of
a condition that a direction of a line of intersection between the rake face and a bisecting cross section of a vertex angle of the nose curvature is within ±10° relative to a <110> direction of the synthetic single-crystal diamond, and
a condition that the direction of the line of intersection between the rake face and the bisecting cross section of the vertex angle of the nose curvature is within ±10° relative to a <100> direction of the synthetic single-crystal diamond.