Self sharpening saw or milling cutter - has teeth made from relatively soft material which is surface hardened for regenerating cutting edge on wearing

摘要

The saw or milling cutter does not require resharpening during its whole life as it is designed to wear into a sharp cutting edge. The basic material is surface hardened pref. by enrichment with borch, and on profile grinding the front of the tooth is ground away and the soft metal is exposed. The tooth front is subject to relatively greater wear than the tooth cutting faces, which then project further forward when the softer core material is worn away. Hence the geometry of the tooth can be designed arbitrarily. In the case of saws, the conventional geometry of the carbide tipped saws can be used. The hardness of the surface layer can be much higher than on using carbides. Since the tooth core is made of soft material there is no danger of fracturing.