Vibration characteristics of multi-parametric excitations and multi-frequency external excitations of rolling mill under entry thickness fluctuation of strip

Xu, Teng; Hou, Dongxiao; Sun, Zhengnan; Guo, Da-wu

doi:10.1007/s42243-020-00404-1

Cited by 14 publications

(6 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[5][6][7][8] To ensure the shape and surface quality of strip steel, frequent roll changes (rolling a certain distance) and offline grinding are necessary to meet the quality and shape requirements. [9,10] The rolling mileage and roll change period limit the flexibility of hot rolling planning and restrict the further improvement of the production rate. [11][12][13] Roll wear and roll profile curvature are usually calculated by a mathematical model.…”

Section: Introductionmentioning

confidence: 99%

Study on Error Compensation Method of Online Roll Profile Measurement

Xing

Peng

Sun

et al. 2023

steel research int.

View full text Add to dashboard Cite

Flatness and surface quality are important quality indexes of strip steel, and roll wear will directly affect the product's flatness and surface quality. Online roll profile measurement technology can obtain the information of roll profile in real time, guide the optimization of roll change rhythm, and improve the flatness control ability of rolling mill and surface quality of strip product. However, the error caused by roll displacement, clearance, roll thermal crown, and other factors is usually the same order of magnitude as the roll shape or roll wear, or even one order of magnitude higher. So error compensation is the key to ensuring the accuracy of online roll profile measurement. Herein, the position measurement technology of the roll bearing block is considered in the online roll profile measurement, and the measurement error caused by the deviation of the roll axis is separated. The thermal crown model is established to separate the measurement errors caused by the thermal crown. The error compensation model of online roll profile measurement is established, and the simulation calculation is carried out. This error compensation method is of great significance to improve the accuracy of online roll profile measurement and realize the fine management of mill roll in service.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on Error Compensation Method of Online Roll Profile Measurement

Xing

Peng

Sun

et al. 2023

steel research int.

View full text Add to dashboard Cite

show abstract

“…Существенное влияние на процесс возникновения автоколебаний оказывает и изменение толщины полосы на входе первой клети стана. Модель влияния толщины полосы на входе предложена в работе [16].…”

Section: Introductionunclassified

Chatter of the stands of the cold Rolling tandem mill 2000 of the Magnitogorsk Iron and Steel Works

Krasnov,

Kachurin,

Vishnyakov

et al. 2023

MEI

View full text Add to dashboard Cite

One of the problems of cold rolling of thin strips is self-excited chatter vibrations, which lead to the appearance of various defects. High-frequency self-oscillations can lead to defects related to surface quality, low-frequency ones with high amplitude levels can lead to gusts of thin bands or even severe accidents of the rolling mill itself. As a rule, self–oscillations occur suddenly at high rolling speeds, more than 20 m / s and thin strips, the thickness is usually around 300-700 microns. For the normal operation of the rolling mill, it is necessary to use special systems for monitoring the vibration state and preventing the occurrence of self-oscillations. The control system for exceeding the critical vibration level generates signals from the automated control system of the mill to eliminate self-oscillations. The critical vibration level is determined by the spectral composition using the fast Fourier transform (FFT). When self-oscillations occur, lowfrequency components from 5 to 20 Hz prevail, frequencies in the range of the third octave from 100 to 200 Hz and frequencies of the fifth octave from 400 to 800 Hz. The cold rolling mill 2000 of the Magnitogorsk Iron and Steel Works combines a tandem five-cell mill and a continuous etching unit. There is no regular vibration monitoring system at the mill, warning and elimination of self-oscillations occurs in manual mode. With the use of research vibration equipment, experimental studies have been conducted on the possibility of using technological parameters to control and prevent the occurrence of self-oscillations. The moment of occurrence of self-oscillations can be controlled by the vibrations of the hydraulic tensioning device (GNU) of the mill. Processing of the vibration displacement signal of the measuring channel of the GNU FFT

show abstract

“…In ref. [10], the nonlinear dynamic behavior of the global bifurcation properties was studied. Studies have shown that the strip thickness fluctuation is one of the factors that lead to changes in the rolling force.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Amplitude-Frequency Characteristics of Vertical–Torsional Coupling System with Harmonic Response in Hot Tandem Mill

et al. 2022

View full text Add to dashboard Cite

Vibration is a common and urgent technical issue in the steel industry. The world’s first multi-mode continuous-casting and rolling plant of Shou Gang Jing Tang Iron and Steel Co., Ltd. (Tangshan, China), has a finishing mill, F3, that experiences frequent, strong vibrations during the process of rolling thin-gauge (<1.5 mm) strip steel, which have seriously hindered the production of high-quality thin strip steel products. The changes in the strips’ surface quality are among the factors that induce rolling mill vibrations. In this study, considering the nonlinear surface quality of strip steel, a finite element model of the F3 mill was established, and the harmonic response method was used to obtain a rolling mill vertical system in the ANSYS environment. This study assesses the sensitive amplitude versus frequency characteristics curve of a torsional coupling system, the influence of strip thickness and strip hardness fluctuations on the vibration of the primary drive system, and the dynamic amplitude versus frequency characteristics of the three directions on the top of a torii. Finally, the field experiment verifies the correctness of the analytical results, which provides theoretical guidance for suppressing rolling mill vibrations and has a certain application value.

show abstract

Vibration characteristics of multi-parametric excitations and multi-frequency external excitations of rolling mill under entry thickness fluctuation of strip

Cited by 14 publications

References 18 publications

Study on Error Compensation Method of Online Roll Profile Measurement

Study on Error Compensation Method of Online Roll Profile Measurement

Chatter of the stands of the cold Rolling tandem mill 2000 of the Magnitogorsk Iron and Steel Works

Dynamic Amplitude-Frequency Characteristics of Vertical–Torsional Coupling System with Harmonic Response in Hot Tandem Mill

Contact Info

Product

Resources

About