Cutting tool, esp. drill, milling tool, tap drill, reamer or chamfering drill - has cutting part coated with sliding layer of lesser hardness than base layer of cutting part giving improved tool life at higher cutting speeds

摘要

A cutting tool (1), esp. a drill, a milling tool, a tap drill, a reamer, or a chamfering drill has a shaft and a cutting part (2) on which at least a cutter (8,9) to cut a workpiece. The tool is novel in that the cutting part is coated with a sliding layer (20) of lesser hardness than the base layer (26) of the cutting part. -