Wood cutting tool

Abstract

Provided is a wood cutting tool with improved wear resistance and corrosion resistance. A hard fundamental layer (18) of chromium nitride (CrN) is subjected to PVD to be coated on a rake face (16) of a substrate (12) formed of a cemented carbide alloy or a tool steel. The hard fundamental layer (18) has a five-layer structure having a first layer (18a) to a fifth layer (18e) disposed in order from the substrate (12) side. A hard main layer (20) of chromium oxide (Cr2O3) is coated on the outer surface of the fifth layer (18e) of the hard fundamental layer (18). The hard main layer (20), like the hard fundamental layer (18), is formed by PVD. The hard fundamental layer (18) is coated with the hard main layer (20) to suppress corrosion, thereby improving the wear resistance and corrosion resistance of a cemented carbide replaceable knife (10).

Dependencies are inferred from the claim text.