轧制界面非稳态油膜润滑特性

Unsteady Lubrication Film Characteristics at Rolling Interface

以流体力学理论、轧制理论及Hill的特性曲线微分方程解法为基础,建立了轧制界面考虑入口板带厚度、轧辊半径发生波动下非稳态油膜厚度分布动力学模型,提出了油膜波动系数来反映界面油膜厚度绝对波动,并进行了相应的仿真分析.结果表明:非稳态条件下轧制界面油膜厚度分布性态会随时间不同而发生变化,不同时刻最小油膜厚度也会发生变化;界面油膜厚度的绝对波动会随着入口板带厚度、轧辊半径非均匀程度加剧而变大,而入口板带厚度、轧辊半径的变化频率对界面油膜厚度的绝对波动影响较小.

Based on hydrodynamics, rolling theory, and characteristics curve solution of Hill differential equation, a dynamic model of unsteady film thickness distribution at the rolling interface was constructed. The model considered the fluctuation of the inlet strip thickness and the roll radius. The film wave coefficient was proposed to reflect the absolute fluctuation of film thickness. The corresponding simulation and analyses were also carded out. The results show that the film thickness distribution and the thinnest film thickness are time-dependent under unsteady condition. As the non-uniform degree of inlet strip thickness and the roll radius increases, the absolute fluctuation of film thickness rises. However, the fluctuation frequency shows little effects on the absolute fluctuation of film thickness.