Super Cutting Speed Property by High Hardness Cubic Boron Nitride Thin Films

Abstract

  High performance of tools coated with c-BN thin films was studied. The c-BN thin film with good adhesion has the high hardness of 5400 HK almost same as c-BN bulk in the substrate voltage-120 V and the low friction coefficient of 0.12. Cutting performance of a general-purpose square-end-mill coated with c-BN was measured. Frank wear of tools coated with c-BN is 150 micron meter at the cutting speed of 150 m/min and is 27 micron meter at the cutting speed of 565 m/min. At a cutting speed higher than 450 m/min, tools coated with c-BN have good cutting performance.