BESCHICHTETER SCHNEIDWERKZEUGEINSATZ

摘要

The present invention relates to a coated cemented carbide inserts (cutting tool), particularly useful for milling at high cutting speeds in steels and milling in hardened steels. The inserts are characterised by a WC-Co cemented carbide containing NbC and TaC and a W-alloyed binder phase and a coating including a first, innermost layer of TiCxNyOz with equiaxed grains, a layer of TiCxNyOz with columnar grains and at least one layer of Al2O3 consisting essentially of the kappa -phase.