Chopping or cutting machine knife, e.g. for a chopping shear, shredding mill or rotary shear, has a metallic cutting region of hardness decreasing with increasing distance from its free face or chip face

摘要

A chopping or cutting machine knife, with a metallic cutting region of hardness decreasing with increasing distance from its free face (3) or chip face (4) to a certain minimum hardness, is new. Preferred Features: The hardness gradient is produced by immersion, flame or induction hardening, laser surface hardening, case hardening, nitriding or carbonitriding.