摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tip excellent in a chipping resistance. SOLUTION: In a cutting tip where the whole of a cutting blade piece, comprised by being brazed to the cutting blade piece fitting part of a tip main body constituted of cemented carbide, is constituted of a BN sintered body, or the cutting blade piece is constituted of the cutting blade layer of the BN sintered body and the bed layer of the cemented carbide integrally sintered and bonded with the cutting blade layer, a sintered reaction layer, having structure dispersedly distributed by TiN and TiB2 in the bare surface of BN over a depth of 0.1-0.5 mm from the surface, is formed on the surface part of the rake face (upper surface) of the cutting blade piece. |