表面形貌对滑动接触界面摩擦行为的影响

In order to study the influence of surface topography on the frictional behavior of the sliding contact interface formed during drawing, a new type of friction testing device was designed. Under oil lubrication conditions, a series of friction tests were carried out on aluminum alloy samples with unidirectional grooves, regular circular pits and random surfaces at different sliding speeds and contact pressures. The three-dimensional surface topography parameters of the samples before and after the test were measured by a non-contact three-dimensional profilometer, and the arithmetic mean deviation of surface height Sa, the surface bearing index Sbi, the void volume in the central area Vvc and the void volume in the valley area Vvv were selected to analyze the variation law of the surface topography of the sliding contact interface. The results show that: the surface with regular circular pits has a lower friction coefficient than the surface with unidirectional grooves and the random surface; under a relatively low contact pressure, the friction coefficients of the three surfaces decrease with the increase of the contact pressure, but under a high contact pressure, the friction coefficients of the three surfaces increase with the increase of the contact pressure; when the contact pressure is constant, the friction coefficients of the three surfaces have a significant dependence on the sliding speed; surface topography, sliding speed and contact pressure are important factors affecting the frictional behavior of the sliding contact interface.

为了研究表面形貌对拉延形成的滑动接触界面摩擦行为的影响，设计了一种新型的摩擦试验装置． 在油润.滑条件下，针对具有单向沟槽、规则圆形凹坑和随机表面的铝合金试样， 以不同滑动速度与接触压力进行一系列摩.擦试验． 利用非接触式三维轮廓仪测量出试验前后试样的三维表面形貌参数， 并选取表面高度算术平均偏差 Sa， 表.面支承指数 Sbi，中心区空体体积 Vvc和谷区空体体积 Vvv来分析滑动接触界面表面形貌的变化规律． 结果表明: 规则.圆形凹坑表面比单向沟槽表面和随机表面具有较低的摩擦系数; 在相对低的接触压力下，3 种表面的摩擦系数随着.接触压力的增大而减小，但在高的接触压力下，3 种表面的摩擦系数随着接触压力的增大而增大; 在接触压力一定.的情况下，3 种表面的摩擦系数对滑动速度有显著依赖性; 表面形貌、滑动速度和接触压力是影响滑动接触界面摩.擦行为的重要因素