Coupling Mechanism of Control on Strip Profile and Flatness in Single Stand Universal Crown Reversible Rolling Mill

Ma, Xiaobao; Wang, Dongcheng; Liu, Hong‐Min

doi:10.1002/srin.201600495

Cited by 26 publications

(13 citation statements)

References 11 publications

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“…Numerous tapered work roll contours are designed according to the control of the strip profile. Ma et al [6] developed a symmetrical tapered work roll contour with unknown tapered height, and claimed that the controlling width was 100 mm. It was designed for a six-high reversal mill with a work roll diameter of 240 mm.…”

Section: Of 15mentioning

confidence: 99%

Silicon Steel Strip Profile Control Technology for Six-High Cold Rolling Mill with Small Work Roll Radius

Shao

Wang

et al. 2020

Metals

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Due to the requirement of magnetic properties of silicon steel sheets, producing high-precision size strips is the main aim of the cold rolling industry. The tapered work roll shifting technique of the six-high cold rolling mill is effective in reducing the difference in transverse thickness of the strip edge, but the effective area is limited, especially for a high crown strip after the hot rolling process. The six-high mill with a small work roll size can produce a strip with higher strength and lower thickness under a smaller rolling load. At the same time, the profile of the strip can be substantially improved. By advancing a well-established analytical method, a series of simulation analyses are conducted to reveal the effectiveness of a small work roll radius for the strip profile in the six-high cold rolling process. Through the analysis of flattening deformation and deflection deformation on the load, the change rule of the strip profile produced by the work roll with a small roll diameter can be obtained. Combined with theoretical analysis and industrial experiments, it can be found that the improvement effect of the small work roll radius on the profile of the silicon strip is as significant.

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Section: Of 15mentioning

confidence: 99%

Silicon Steel Strip Profile Control Technology for Six-High Cold Rolling Mill with Small Work Roll Radius

Shao

Wang

et al. 2020

Metals

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“…Because of the application of electrical steel (such as it is required to be laminated on many occasions), the requirement of strip profile and flatness quality is increasingly strict. To solve the problem, the new-generation high-tech rolling mills and various shape control methods, [1][2][3][4] such as continuously variable crown (CVC), pair cross (PC), SmartCrown, asymmetry self-compensating rolling (ASR), and Kawasaki steel work-roll shifting (K-WRS), are established and have been applied by the competitive steelmakers worldwidely. [5][6][7][8][9][10] For the uneven deformation crown control of the upstream stands of hot strip mills (HSMs), CVC technology and SmartCrown technology can increase the crown control ability by shifting the work roll.…”

Section: Introductionmentioning

confidence: 99%

Work Roll Shifting Strategy of Uneven “Cat Ear” Wear Control for Profile and Flatness of Electrical Steel in Schedule‐Free Rolling

Cao

Xiong

Huang

et al. 2020

steel research int.

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There are severe uneven “cat ear” wear contours of work rolls, the key factors to affect high‐quality profile and flatness control of electrical steel strips, in the schedule‐free rolling process with a large number of the same width strip rolling campaigns of hot rolling mills. The work roll wear prediction model, thermal roll contour model, and a 3D finite‐element model of roll stacks and strip are established using MATLAB and ABAQUS software. The effects of the work roll wear contour on the loaded roll gap profile within the entire rolling campaign are analyzed. A variable stroke and step (VSS) shifting strategy is developed based on the exponentially damped sinusoids function, which can get the smooth work roll wear contours. The main parameters including attenuation coefficient of stroke, the coil number and the attenuation coefficient of the first shifting cycle, and the initial phase avoiding repetition of the shifting position, are obtained by genetic optimization. The industrial application of the VSS shifting strategy gives remarkable results. The “cat ear” height value of local work roll wear contours is decreased by 67.3% and the high‐precision rate of crown from 25 to 40 μm of the electrical steel is increased by 22.5%.

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“…Many efforts have been made to control the strip shape defects. Bai et al [16][17][18][19][20][21] used optimization strategies such as hydraulic rolls bending, rolls shifting, and new roll contour to control the flatness defects. The influence of lubrication on profile and flatness with asymmetry self-compensating work roll (ASR) was studied during hot strip rolling process to meet the requirement of schedule-free rolling (SFR) campaigns for nonoriented electrical steel production with identical strip width.…”

Section: Introductionmentioning

confidence: 99%

A Study on Potential Strip Shape Control of High‐Strength Steel during Hot Pinch Rolling Process

Kong

Zhao

Cao

et al. 2020

steel research int.

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Hot‐rolled high‐strength steel (HSS) strips always present side‐camber after they are cut into subsections along the rolling direction. To deal with the potential strip shape defect of hot‐rolled HSS, the nonlinear finite element (FE) software is applied to establish a 3D model of pinch roll and strips to simulate the pinch rolling process before the hot rolling coiler. The effects of temperature distribution, roll wear, friction coefficient, initial strip flatness defects, and tension on the strip longitudinal extension distribution are studied along the width direction. The results indicate that the pinch roll wear presents a great influence on both the tendency and quantitative value of the strip longitudinal extension distribution. The maximum unevenness value is 178%, and the maximum differences of longitudinal strain between the center and edge of the strips reach to 51.43%. A newly pinch roll contour is proposed to improve the potential strip shape defects. After the industrial application, the average pinch roll wear thickness decreases from 180 to 120 μm. The hot rolled strips are cut into substrips and the maximum side‐camber value decreases from 12 to 3 mm, which meets the requirement from the auto part manufacturers.

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Coupling Mechanism of Control on Strip Profile and Flatness in Single Stand Universal Crown Reversible Rolling Mill

Cited by 26 publications

References 11 publications

Silicon Steel Strip Profile Control Technology for Six-High Cold Rolling Mill with Small Work Roll Radius

Silicon Steel Strip Profile Control Technology for Six-High Cold Rolling Mill with Small Work Roll Radius

Work Roll Shifting Strategy of Uneven “Cat Ear” Wear Control for Profile and Flatness of Electrical Steel in Schedule‐Free Rolling

A Study on Potential Strip Shape Control of High‐Strength Steel during Hot Pinch Rolling Process

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