Research of Roughness of Hard Turned Bores

Abstract

This paper reports an extensive characterization of the surface roughness generated during hard turning operations performed with conventional PCBN tools and during combination turning and grinding machining. Hard turning has been applied in many cases such as producing bearings, gears, axles and other mechanical components. The PCBN is widely used for finish machining of hardened steel parts (HRC 45–65). The special condition of dry hard cutting is the required cutting speed must be ranged from 90 to 180 m/min. After the hard turning and combination machining tests, the relevant changes of surface profiles and surface roughness parameters were successively registered and measured by a profilometer. Based on the experimental results, this paper shows and analyse the modification of the surface roughness parameters in case of hard turning and combination machining.