Cemented carbide inserts for milling of hard Fe-based alloys >45 HRC

摘要

The present invention relates to cutting insert for milling of hardened steels, tool steels and hard cast irons and stainless steels with a hardness of >45 HRC comprising a substrate and a coating. The substrate has a hardness of 1700 HV3-2000 HV3, with a 10° angle and 0.2 mm wide negative chamfer giving an edge sharpness of 0 (sharp)-40 µm and the coating comprises a homogeneous Al x Ti 1-x N-layer with x=0.6-0.67, preferably x=0.62 and a thickness of 1-3.8 µm. The invention also relates to a method of making as well as the use of the inserts.