DIAMOND-COATED CEMENTED CARBIDE CUTTING TOOL, AND METHOD FOR PRODUCING SAME

摘要

A cutting tool made of diamond-coated cemented carbide includes: a tool body made of tungsten carbide-based cemented carbide including: 3 to 15 mass% of Co; at least one of TaC and NbC of which a total amount is 0.1 to 3.0 mass%; and a balance including WC; and a diamond film coating the tool body, the tool body has a plurality of protrusions on a surface of the tool body, an upper portion of each of the protrusions is made of the at least one of TaC and NbC, and a lower portion of each of the protrusions is made of WC and Co, the lower portion being under the upper portion.