润滑接触摩擦力的往复式实验研究

Effect of surface roughness on sliding friction in lubricated contacts-reciprocal experiment study

在往复式试验机上研究实际加工表面球-盘式接触混合润滑摩擦特性,比较采用不同黏度润滑油光滑接触摩擦力的大小。针对表面粗糙度幅值和纹理对摩擦行为的影响进行研究,结果表明,混合润滑时较高黏度润滑油的摩擦力较小;表面粗糙度幅值在混合润滑时对摩擦力影响较大,且随速度增加而增强,边界润滑时影响很小。与纵向纹理相比,横向纹理表面的摩擦力较小且稳定,低速时这种差别更加明显。

Due to shortage of energy supply and worsening environment, friction reduction is an urgent subject of tribology, a longterm attempt has been done to reduce or control friction by design and machining of surface topography. However, there is a difficulty in understanding mechanism of topography effects on friction behaviors. Friction performances of machined surface are stud- ied in Universal Material Tester（UMT）. All tests are conducted between a ball and a disk. At first, the magnitude of friction is compared in smooth contacts lubricated by the oils of different viscosity. And then the influences of roughness amplitude and surface texture on friction behaviors are investigated. The experimental results show, the higher viscosity lubricant would give rise to the lower friction in mixed lubrication regime. Roughness amplitude imposes a strong influence on friction in mixed lubrication regime, and the effect gets stronger with increasing speed, but less effect in boundary lubrication. Compared with longitudinal texture, transverse texture is lower and yield small fluctuations in friction, especially at the low speed.