高速轧机工作界面的负阻尼特性

来源期刊：中南大学学报(自然科学版)2002年第4期

论文作者：段吉安 钟掘

文章页码：401 - 404

关键词：轧制界面;动力学;模型;耦合

Key words：rolling interface; dynamics; model; coupling

摘    要：轧制界面作为轧制过程的工作界面,其动力学特性对轧机振动有决定性影响.作者分析了动态情况下轧制界面上的金属塑性流动、界面摩擦学、工作辊运动等行为机理及其耦合特性;通过研究工作辊振动对界面润滑膜厚的影响以及界面动态摩擦学行为对金属塑性流动的影响,建立了轧制界面的动力学模型,并对轧制界面的阻尼特性进行了数值仿真.研究结果表明:在混合润滑条件下,轧制界面因润滑膜厚动态变化可产生负阻尼,界面阻尼的大小与轧制工艺、轧辊表面状态、润滑剂特性等参数密切相关,为解释轧机自激振动机理、控制或消除轧机颤振提供了理论基础.

Abstract: Dynamic properties of rolling interface directly determine the chatter of rolling mill. In this paper, the metal plastic flow, tribology performance of the interface, vibration of work roll and their coupling relationship are analyzed.Taking into account the effect of work roll vibration on tribology behavior of rolling interface, a dynamic model of rolling interface in rolling mill is established. This model reflects the effect of dynamic interface lubrication on metal plastic flow. Based on this model, numerical simulations of the damping property of the rolling interface are accomplished. It is found that the rolling interface is of negative damping coefficient due to the dynamic variation of the thickness of lubricating film on the rolling interface under the hybrid-lubricated condition.