关键词: 球-盘摩擦;三维接触应力;车削试验;刀具-切屑摩擦模型

Abstract: The ball-disc friction experiments have been performed by UMT-2 friction tester. The ball material is cemented carbide (material of cutting tool) while the disc material is Al7050-T7451 (material of workpiece). The 3D profile of groove on the disc after friction test and wear pattern on the ball have been measured to determine the contact stress in the 3D stress conditions. A model of average friction coefficient, which considers the effect of sliding speed and average contact stress, has been presented. Orthogonal cutting experiments have been performed and the cutting forces and thrust forces have been measured to calculate the mechanical model, which is presented to describe the contact between cutting tool and chip. The contact length between cutting tool and chip, length of sticking and sliding zone in the different cutting conditions has been calculated.

Key words: ball-disc friction;contact stress;orthogonal cutting experiments;friction between cutting tool and chip