滑动摩擦结合面磨合磨损表征方法与影响因素

定量分析研究磨合磨损的表征方法与影响因素对于获得低磨损率的稳定持续工作状态、保证摩擦副工作性能和使用寿命都具有重要意义。基于质量磨损量,构建了滑动摩擦磨合磨损的表征方法,得到一种新的磨合磨损相关参数计算模型。采用球-盘摩擦副,得到磨削抛光表面、周向纹理表面与径向纹理表面3种表面形貌的样件在不同工况下的质量磨损量,分析了法向载荷、滑动速度和初始表面状态3种因素对摩擦副结合面磨合磨损的影响,推出磨合磨损阶段的质量磨损率和磨损系数随时间的变化规律。结果表明:载荷和转速均与初始质量磨损率正相关;在磨合磨损初期,周向纹理表面的质量磨损量和质量磨损率较高;在整个磨合磨损过程中,磨削抛光表面的磨损系数较为稳定,径向纹理表面的磨损率最低,而钢球对磨件的磨损量却最大,在低速或低载时体现的尤为明显。

Characterization Methods and Influence Factors of Running-in Wear Between Sliding Joint Surfaces

Quantitative analysis of characterization methods and influencing factors of running-in wear is of great significance for stable working state with low wear rate, excellent friction performance and long service life. Characterization methods of sliding running-in wear was established and a new calculation model of relevant parameters was obtained based on the wear mass loss. With ball-disk friction pair, wear mass loss of grinding polishing surface, circumferential textured surface and radial textured surface were obtained under different operating condition. The influences of loading, revolving speed and initial surface morphology on sliding joint surfaces were investigated. Rule of mass wear rate and wear coefficient changing with time were derived in running-in wear stage. The results show that, loading and revolving speed are positively correlated with initial mass wear rate. At the beginning of the running-in wear, circumferential textured surface has higher mass wear loss and wear rate. In the whole process of running-in wear, wear coefficient of grinding polishing surface is relatively stable, wear rate of radial textured surface is the lowest. Nevertheless, the wear mass of its paired three balls is the largest, especially for lower speed or loading.