T形沟槽表面织构对金属-橡胶密封副摩擦性能的影响

Effect of T-shaped Groove Surface Texture on the Friction Performance of Metal-Rubber Seal Pair

为研究T形沟槽形非光滑表面的形貌参数对摩擦性能的影响,验证自组装凹坑形非光滑表面的耐磨性能,基于稳态二维不可压缩Reynolds方程,建立T形沟槽表面织构化理论模型;利用有限差分法和高斯-赛德尔迭代法求解金属表面的油膜压力分布和剪切应力,进而获得油膜承载力和摩擦因数;对T形槽织构的宽度系数比α、深度系数比β对金属-橡胶摩擦副油膜承载能力和摩擦因数的影响规律进行数值分析。结果表明:T形沟槽织构的存在使得油膜内部的压力增大,并且随T形沟槽宽度系数比增加,织构动润滑性能先增大后减小再增加,宽度系数比在40%时达到最佳,且宽度系数比越大,织构的动压效应越差,宽度系数比无限接近1时,沟槽突变为矩形沟槽,使动压效应增加;随着T形沟槽深度系数比增加,织构动润滑性能先增加后减小,宽度系数比在40%~60%内最佳;在流体动压润滑范围内,适当控制T形沟槽的宽度比和深度比,使沟槽底部尽可能平整,保证织构上下两部分良好的协同作用和动压区域,便能获得润滑减摩性能最好的T形沟槽表面织构。

In order to study the effect of the morphology parameters of the T-shaped groove-shaped non-smooth surface on the friction performance,the wear resistance of the self-assembled pit-shaped non-smooth surface was verified.Based on the steady-state two-dimensional incompressible Reynolds equation,a theoretical model of T-groove surface texture was established;the finite difference method and the Gauss-Seidel iteration method were used to solve the oil film pressure distribution and shear stress on the metal surface,thus the oil film bearing capacity and friction factor were obtained;the influences of the width coefficient ratioαand depth coefficient ratioβof the T-slot texture on the oil film bearing capacity and friction coefficient of the metal-rubber friction pair had been numerically analyzed.The results show that the existence of T-shaped groove texture increases the pressure inside the oil film,and with the increase of T-groove width coefficient ratio,the dynamic lubrication performance of the texture first increases,then decreases and then increases,when the width factor ratio is 40%,the best hydrodynamic lubrication performance is achieved,and the larger the width factor ratio is,the worse the dynamic pressure effect of the texture is;when the width factor ratio is close to 1,the groove becomes a rectangular groove abruptly,which increases the dynamic pressure effect;as the T-groove depth coefficient ratio increases,the texture dynamic lubrication performance first increases and then decreases,and the width coefficient ratio is the best in the range of 40%to 60%;within the range of hydrodynamic lubrication,appropriately controlling the width ratio and depth ratio of the T-groove,making the bottom of the groove as flat as possible,ensuring good synergy and dynamic pressure area between the upper and lower parts of the texture,T-groove surface texture with the best lubrication and friction performance can be obtained.