不同表面粗糙度的摩擦副润滑状态的 Stribeck曲线研究

利用Stribeck润滑曲线理论分析和薄膜润滑试验考察了不同表面粗糙度的钢球与圆盘点接触及钢滑块与圆盘面接触摩擦副的润滑状态，通过改变圆盘转速获得了包含薄膜润滑状态的Stribeck曲线．结果表明：在Stribeck曲线上可以划分出薄膜润滑状态，其位于摩擦系数谷底附近；薄膜润滑的产生及其区间大小同圆盘表面粗糙度密切相关；圆盘表面粗糙度较小时更易形成薄膜润滑状态，而圆盘表面粗糙度较大时薄膜润滑状态不明显；光滑表面对应的Stribeck曲线谷底较宽，相应的薄膜润滑区间亦较宽．

Study on the Lubrication State of Frictional Pairs with Different Surface Roughness Based on Stribeck Curves

The lubricating states of a steel ball-disc point contact pair and a steel sliding block-disc plane contact pair were investigated based on theoretical analysis of the relevant Stribeck curves and thin film lubrication test. Thus the Stribeck curves involving the thin film lubrication regime were obtained by changing the rotary speed of the disc. As the results, it was feasible to recognize thin film lubrication regime on the Stribeck curves, and the thin film lubrication zone was near to the friction coefficient valley. The appearance of the thin film lubrication regime and its range was closely dependent on the surface roughness of the disc. Namely, it was easy for the frictional pair to reach thin film lubrication regime as the disc had a smaller surface roughness, while it was hard to differentiate the thin film lubrication regime as the disc had a larger surface roughness. Moreover, the Stribeck curve for the frictional pair of a smaller disc surface roughness showed a broader frictional coefficient valley and thin film lubrication zone as well.