Wood cutting tool
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United States of America Patent
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May 7, 2013
Grant Date -
Feb 10, 2011
app pub date -
Apr 22, 2009
filing date -
Apr 25, 2008
priority date (Note) -
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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).
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