Dynamic Model of the Hot Strip Rolling Mill Vibration Resulting from Entry Thickness Deviation and Its Dynamic Characteristics

Xinxin Wang,Xiaoqiang Yan

doi:10.1155/2019/5868740

Xinxin Wang, Xiaoqiang Yan

Open Access

https://doi.org/10.1155/2019/5868740

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Abstract

The vibration demolding of the crystallizer leads to slab thickness deviation in continuous casting processes. Therefore, in this paper, the dynamic model of the hot strip rolling mill vibration resulting from entry thickness deviation is proposed and its dynamic characteristics are studied. First, the dynamic model of vertical vibration in the hot strip rolling mill is established based on Sims’ rolling force model. Then, the model validity is certified by comparing the simulation with field test data from a 1580 hot strip rolling mill. Finally, we investigate the influence of model parameters on the dynamic characteristics of hot strip rolling mill vibration resulting from entry thickness deviation. The result indicates that hot strip rolling mill vibration resulting from entry thickness deviation can be reduced by increasing the area of the hydraulic cylinder piston side and the entry thickness as well as by decreasing the deformation resistance, rolling speed, and equivalent stiffness.

Highlights

It is well known that mill vibration has become a bottleneck in thin steel strip manufacturing and a global problem [1]
Kim et al [3] proposed a mathematical model of a cold rolling mill by considering the friction forces between rolls and the contact stiffness caused by roller bearings and rolls
Zheng et al [4] analyzed the spatial vibration of four-high rolling mills using the modified Riccati-transfer matrix method (Riccati-TMM) and the finite element method (FEM)

Summary

Introduction

It is well known that mill vibration has become a bottleneck in thin steel strip manufacturing and a global problem [1]. Fan et al [13] proposed a dynamic model of hot rolling mill vertical vibration to analyze the influence of rolling process. All above-mentioned models cannot be used to study the effect of entry thickness deviation on hot rolling mill vibration. We propose a vertical vibration dynamic model of the hot strip rolling mill based on Sims’ rolling force model [17, 18] to study dynamic characteristics of hot strip rolling mill vibration resulting from entry thickness deviation.

Dynamic Model

Model Validity

Findings

Conclusion