A study of wear mechanisms of PCBN cutting tools used in precision turning of hardened 09crsi steel

The features of chip formation, cutting temperature and wear in hard turning are addressed in recent studies but the wear mechanism of PCBN cutting tool in precision turning has not been realli understood. The research results of the authors in turning hardened 09CrSi steel using PCBN cutting tools shows that rake face and flank face wear were the two main types of wear. The mechanism of the rake face wear involved with the abrasion wear caused by hard particles in the steel and wear of surface layers based on adhesion - fatigue. The flank face wear was not normalli the detachments of CBN particles but might be involving directli with heat, frictional interactions between work and tool materials in a combination with oxidation phenomenon. Wear of cutting tool had directly affected surface roughness of the machined element.