Coated cermet cutting tool and use thereof

摘要

The present invention relates to a cutting tool insert comprising a cermet body comprising a Co and/or Ni binder phase and a coating deposited as monolayer or as multiple and/or alternating layers of carbide, nitride or oxide deposited by CVD- and/or MTCVD-methods. The coating has a thickness of 21-50 µm, when the inserts have a flat rake face, without or with simple chipbreakers and a Co binder phase or a thickness of 10-50 µm when the inserts have a rake face land with a width of 100-300 µm with an angle of 10-25° to the rake face and a Co and/or Ni binder phase. The cermet body comprising more than 50 vol% Ti-based carbonitride and less than 15 wt% and more than 6 wt% Co and/or Ni binder phase and the cermet body has a hardness measured as Vickers Hardness at 3kg load, HV3, of >1650 HV3. The present invention also relates to the use of the coated cutting tool insert for the machining of cast iron work pieces at a cutting speed of >300 m/min, at a cutting depth of 2-8 mm and a feed of 0.2-0.7 mm/rev.