| abstract |
The present invention provides a cutting insert made of a WC-based cemented carbide capable of obtaining a good finished surface with a long life, less abnormal damage, and a method for producing the same. In a WC-based cemented carbide cutting insert containing Co as a binder phase component, a sintered skin within a range of at least 2 mm from the intersecting ridge line between the flank face and the honing portion toward the inside of the rake face. In the surface region of the chip breaker portion subjected to wet blasting, the hcp transformation rate of the bonding layer Co is set to 0.3 or more, the surface roughness Ra is set to 0.2 μm or less, and the WC hard phase remains on the insert surface. By setting the stress to 850 MPa or more by compression, even in cutting conditions where thermal shock acts on the cutting edge, such as wet cutting and intermittent cutting, prevention of crack initiation / development, improvement of fracture resistance, finished surface of the work material Improve accuracy. [Selection] Figure 2 |