圆凹坑织构对线接触摩擦副摩擦学性能的影响

根据摩擦试验中圆盘试样的旋转方向,用YLP-20型激光加工系统在圆柱销试样回转面不同区域(前端、后端、中间)加工规则分布的表面织构,利用UMT-3摩擦磨损仪进行单向旋转摩擦试验,研究表面织构分布区域对摩擦副摩擦学行为的影响。结果表明:在载荷10N、滑动速度0.003~0.628m/s时,不同分布区域的织构对摩擦副的摩擦学行为影响不同,相比无织构试样,分布于试样回转面中间部分的织构对摩擦副起到了减摩作用。这是由于中间织构通过形成局部流体动压润滑作用提高了摩擦副的承载能力,降低了接触表面的摩擦因数,同时通过储存磨屑,减少了表面磨损。前后端织构产生的流体动压润滑效应很小,磨损严重,导致其摩擦因数高于中间织构和无织构试样的摩擦因数。

Influence of Dimple Texture on Tribological Behavior of Line Contact Friction Pairs

To investigate the effect of the distribution area of surface texture on the tribological behavior of friction pair, a YLP20 laser processing system was used to process the surface texture with regular distribution in different cylindrical rotary surface areas respectively, and the single tribological test under the condition of rotating was conducted by a Tribometer (UMT3). Test results show that the textures of different distribution areas(front, back and middle texture of line contact specimen) have different effects on the tribological behaviors of friction pairs, and textures in the middle of the line contact specimen have better effect of friction pairs on reducing friction under the experimental conditions that the load is 10 N and the sliding speeds are 0.0030.628 m/s compared with nontextured sample. The reason is that surface textures reduce the friction coefficient of the contact surfaces and improve the bearing capacity of the friction pairs by forming local hydrodynamic pressure lubrication. Moreover, surface textures reduce the surface wear by storing particles. The frontend textured sample and backend textured sample have higher friction coefficients because of their more serious grinding cracks and more particles, and they have minimal effect of hydrodynamic pressure lubrication.