金属塑性加工过程界面油膜特性研究

Research on Characteristics of Oil Film for Work Interface in Metal Rolling Processes

综合应用流体动力润滑理论和轧制理论,建立了金属塑性加工界面油膜厚度基本模型。通过入口区的分析,建立了考虑非稳态变量如入口角、带张力、轧制速度等因素影响的入口油膜厚度模型,同时还分析了入口油膜厚度的线性解及其频率响应情况。金属塑性加工界面工作区油膜厚度基本模型建立在已知的非稳态入口区分析的基础之上。以某大型公司轧机为例,通过仿真模拟,定量分析了一些主要参数对入口区和工作区油膜厚度分布的影响。计算结果表明:首先应避免轧辊速度的波动和低频后张应力,这是因为它们可能导致入口油膜厚度的较大变化;其次尽量避免轧辊的高频振动,这是因为轧辊振动频率越高,入口角变化越快,而入口角高频率变化也会极大地增大入口油膜厚度的变化。

On the basis of rolling theory and hydromechanics theory,a basic film thickness model of work interface in metal rolling processes was developed. The inlet film thickness was defined by the analysis of the inlet zone, and the influence of unsteady variables such as inlet angle, strip tension stress and rolling speed variation on inlet film thickness were investigated, and the analysis of linear solutions and frequency response of inlet film thickness was made. The analysis of the unsteady work zone was based on the known inlet zone. rolling mill in a certain corporation was chosen as the subject for the study. Using simulation program, the influence of some main parameters on the film thickness distribution of work zone and inlet zone was analyzed quantitatively. The calculatrd results indicate that avoiding low frequency back tension stress and roll speed variations which may cause inlet film thickness variations. Secondly, high frequency rolling mill vibrations should definitely be avoided since they may induce a high frequency inlet angle change which will in turn dramatically increase the inlet film thichness variation.