Throw-away tipped drill.

摘要

A throw-away tipped drill comprises an insert (21, 31) for cutting a workpiece and a shank (22, 32) to be mounted on a prescribed position of a cutting machine, and the insert (21, 31) is disengageably mechanically connected with the shank (22, 32). At least a cutting edge of the insert (21, 31) is formed of a diamond or cubic boron nitride sintered body, and the shank (22, 32) is made of steel. Due to this structure, the insert (21, 31) has excellent wear resistance and adhesion resistance, while the shank (22, 32) has sufficient toughness against breakage. Further, the drill requires no resharpening for continuous use.