关键词: 纯铁, 车削, 刀具寿命, 平均磨损量, 表面完整性

Abstract: The finish turning of pure iron material with uncoated carbide tools under minimal-quantity lubrication was performed to investigate the tool wear and its effects on the surface integrity of pure iron material turned respectively by the tool with an average flank wear of 0. 12 and 0. 21 mm.The results show that ( 1) the life of the tool used in the finish turning of pure iron material is greatly influenced by the turning speed; ( 2) the nose wear and the notch wear on the flank surface are two main wear modes of the tool; ( 3) the surface roughness rapidly increases with the tool wear at a high turning speed but first increases and then changes a little with the tool wear at a low turning speed; ( 4) both the tangential and the axial residual stresses on the tool surface first decrease and then increase with the increase in the tool wear at the turning speeds of 100 and 300m/min,while the surface microhardness first increases and then decreases; and ( 5) with the increase in tool wear,both the distortion and the tensile plastic deformation of grains in the surface layer increase,and serious tearing and plastic flow defects appear on the workpiece surface.

Key words: pure iron, turning, tool life, average wear, surface integrity