直线运动滚动导轨副混合润滑研究

综合考虑了直线运动导轨副接触几何、预紧力、真实表面粗糙度、曲率系数等因素,建立了直线运动导轨副混合润滑数值模型,研究了滑块移动速度、曲率半径系数、工作载荷、表面粗糙度对导轨接触副润滑特性的影响,得到结论:导轨副法向工作载荷、最大赫兹接触压力和赫兹接触半径随着外加总载荷的增大而增大,平均膜厚随着载荷的增大而减小;混合润滑模型可预测导轨副在大范围工况条件下完整的润滑状态;直线运动导轨大多工作在混合润滑状态下,随着滑块移动速度的增加,接触界面由边界润滑状态向混合润滑状态转变,润滑性能逐渐提高;适当增加曲率半径系数,有利于润滑油膜的形成与稳定。

Mixed lubrication of a linear motion rolling guideway pair

A numerical model for the mixed lubrication of a linear motion rolling guideway pair was proposed considering the factors of contact geometry, preload, real surface roughness and curvature coefficient.The effects of the moving speed, curvature coefficient, load and surface roughness on the lubrication characteristics of the linear motion rolling guideway pair and sub-stress were studied.The results show that the normal working load of the guideway pair, maximum Hertz pressure and Hertz contact radius increase with the rise of the normal total load, however, the average film thickness decreases with the growth of the normal total load.The numerical model can be used to predict the whole lubrication characteristics in a wide range of operating conditions of the guide rail.The linear motion guide rail is mostly working under the mixed lubrication state, and as the moving speed increases, the contact interface performs from the boundary lubrication condition to mixed lubrication condition, the lubrication performance becomes better and better. Appropriately increasing the coefficient of curvature radius will be conducive to the formation and stabilization of oil film.