高速轧机工作界面非稳态润滑过程界面动力学特性  

Interface dynamic characteristics of high-speed rolling mill work interface based on unsteady lubrication process

作　　者：王桥医[1] 陈娟[1] 高瑞进[1] 赵勇 

机构地区：[1]杭州电子科技大学机械工程学院,浙江杭州310018 [2]西南铝业(集团)有限责任公司,重庆401326

出　　处：《中南大学学报（自然科学版）》2013年第2期546-551,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51175133)

摘　　要：综合运用轧制理论、流体力学理论、摩擦润滑理论,建立考虑非稳态润滑过程轧机系统力学模型。该模型综合运用界面摩擦模型、轧制力、轧制力矩模型、流体动力润滑模型构成的多重耦合模型,定量分析高速轧机工作界面非稳态润滑过程界面动力学特性。研究结果表明:对于较小的压下率,摩擦应力很小,摩擦应力最大值发生在入口和出口的边缘处,并且在较小的压下率下油膜压应力变化非常小;在较大的张应力条件下,工作区压应力低,油膜剪切应力小,压力梯度也相当小;摩擦应力在入口和出口边缘达到最大;随着张应力的减小,油膜压力增大,剪切应力增大更快,最终达到了润滑油抗剪强度;在全膜润滑或者表面粗糙度很小的情况下,轧制力的平均值和轧制力变化的幅度随着压下率的增加而增加,轧制力的最小值几乎一样,不受表面粗糙度和压下率变化的影响;轧制力矩的变化趋势和轧制力的变化非常相似,然而对于带材表面粗糙度很大的轧制过程,轧制力矩的变化幅度比轧制力的变化小。On the basis of rolling theory, hydromechanics theory, lubrication and friction theory, the mechanical model of rolling mill system based on the rolling gap during unsteady lubrication process was presented. In the analysis of interface dynamic characteristic process, the coupling model that consists of interface friction model, the rolling force and rolling torque model and hydrodynamic lubrication model was taken into account, and the interface dynamic characteristics of the high-speed rolling mill work interface based on unsteady lubrication process were discussed quantificationally. The results show that for small reductions, the friction stress values are low and their maximum values occur at the inlet and outlet edges, and for small reductions, the change of lubricant pressure is small. At high tension stress, the pressure in the work zone is low, the lubricant shear stress is small, the pressure gradient is also rather small. The friction stress is the maximum at the inlet and outlet edges. As the tension stress decreases, the lubricant pressure increases, the shear stress rises more quickly and finally reaches the lubricant shear strength. For full film lubrication or the large surface roughness case, the average roll force and its variation amplitude increase with the increase of the reduction, and the minimum of the roll forces is at about the same level regardless of reduction and surface roughness. The trends of roll torque variations are very similar to those of the roll force variations. However, for a high strip surface roughness operation, the roll torque variation amplitude is smaller than that of the roll force.

关 键 词：高速轧机 工作界面 非稳态润滑 动力学 耦合模型 

分 类 号：TH117.2[机械工程—机械设计及理论]