1580四辊热轧机轧制力对系统动力响应的影响分析

发布时间：2018-08-13 20:00

【摘要】：随着科学技术的不断进步,各行业都呈现出突飞猛进的发展势头,对板带钢的质量和产量要求也越来越高。然而轧机振动问题是影响板带钢质量和产量的重要原因之一,对此国内外学者对于轧机振动问题进行了大量的研究。但在结构方面大多研究的都是轧机局部系统的振动,不能综合地考虑在轧机各部件相互作用影响下轧机整体振动特点。在外部激振力方面关于以轧制力作为轧机激振力的研究,大部分把轧制力都作为恒定力施加在轧机上来研究轧机的振动特性,而忽略了由于板带钢的存在轧制力是波动的力这一特点。实际上轧机振动的因素有很多,而轧制过程中波动的轧制力对轧机系统的影响是造成轧机振动甚至严重损坏的主要原因之一,也是轧机振动领域中需要一直重视的研究方向。本文综合考虑了辊系轴承座与机架之间的间隙、支承辊和工作辊之间的线性刚度和非线性阻尼等影响因素,以包括主传动系统、轴承座、机架为一体的1580四辊轧机系统为研究对象进行合理简化,建立了该轧机振动的几何分析模型。基于ANSYS有限元软件,对建立的1580四辊轧机系统模型进行了数值模拟计算,计算了轧机的固有频率及主振型。将计算结果与在生产现场对该轧机进行刚度测试实验获得的数据进行对比,证明了该轧机建模的合理性,也直观的了解了轧机振动的固有特性,并为下一步的仿真分析提供了理论依据。基于已经建立的1580四辊轧机振动模型,在LS-DYNA显性动力学分析软件中进行轧机轧制过程的仿真。增加塑性轧件来为轧机施加波动的轧制力,得到在波动的轧制力的作用下轧机振动的特性。通过LS-Pre Post、Matlab等软件来获取轧机各部件的一系列振动曲线,观察及分析轧机在轧件咬入阶段的振动特性,这为优化轧机结构或解决实际工作中轧机出现的异常振动都提供了理论参考。
[Abstract]:With the continuous progress of science and technology, every industry is showing a rapid development momentum, and the quality and output of strip steel are more and more demanding. However, the vibration problem of rolling mill is one of the important reasons that affect the quality and output of strip and plate. Many scholars at home and abroad have done a lot of research on the vibration problem of rolling mill. However, in the aspect of structure, the vibration of the local system of the rolling mill is mostly studied, and the overall vibration characteristics of the mill cannot be considered comprehensively under the influence of the interaction of the various parts of the mill. In the aspect of external exciting force, most of the rolling force is applied to the rolling mill as a constant force to study the vibration characteristics of the rolling mill. The rolling force is a fluctuating force due to the existence of strip steel. In fact, there are many factors of rolling mill vibration, and the effect of rolling force fluctuating during rolling process on rolling system is one of the main causes of rolling mill vibration and even serious damage, and it is also the research direction that needs to be paid attention to in the field of rolling mill vibration. In this paper, the influence factors, such as the clearance between the bearing seat of the roller system and the frame, the linear stiffness and the nonlinear damping between the backup roll and the work roll, are considered synthetically to include the main transmission system, the bearing seat, etc. The 1580 four high rolling mill system with the frame as an integral whole was reasonably simplified and the geometric analysis model of the rolling mill vibration was established. Based on the finite element software ANSYS, the system model of 1580 four high rolling mill is numerically simulated, and the natural frequency and main vibration mode of the mill are calculated. Comparing the calculation results with the data obtained from the stiffness test of the mill at the production site, it is proved that the modeling of the mill is reasonable, and the inherent characteristics of the rolling mill vibration are intuitively understood. It also provides the theoretical basis for the next simulation analysis. Based on the established vibration model of 1580 four high rolling mill, the rolling process is simulated in LS-DYNA explicit dynamic analysis software. The vibration characteristics of the rolling mill under the action of the fluctuating rolling force are obtained by increasing the plastic workpiece to apply the fluctuating rolling force to the rolling mill. A series of vibration curves of various parts of the rolling mill are obtained by using LS-Pre postscript Matlab software, and the vibration characteristics of the rolling mill during the bite stage are observed and analyzed. It provides a theoretical reference for optimizing the structure of rolling mill and solving the abnormal vibration of rolling mill in practice.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG333

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