Mixed Scheduled Rolling of High Tensile Strength and Mild Steel Using a High-accuracy Profile Model in Hot Strip Finishing Mill

Fukushima, S.; Washikita, Yoshiro; Sasaki, Tomoya; Nakagawa, Shigemasa; Buei, Yasuhiko; Yakita, Yukihiko; Ye, Jun

doi:10.2355/tetsutohagane.100.1499

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…Kim et al [16] proposed a model to predict the distribution of rolling force and tension of hot rolled strip by considering the influence of pre deformation near the roll entrance before the strip enters the bite zone. Suguhiro et al [17] developed a new method of high-precision online shape prediction model based on matrix model by taking rolling force and tension into account through experiments and finite element analysis. Garber et al [18] developed the calculation program of the main drive power of the hot rolling wide strip mill, which reduced the contact stress of the roll by redistributing the tension reduction and tension between the stands and increasing the temperature of semi-finished products.…”

Section: State Of the Artmentioning

confidence: 99%

Shape Change Simulation Analysis of Wheel Steel in a Four-High Hot Rolling Mill

Liu¹,

Cui²,

Li³

et al. 2022

Int. j. simul. model.

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To reveal the shape change characteristics during the rolling process of the four-high hot continuous rolling mill, a three-dimensional finite element model was built with the wheel steel 380CL as the sample. The equivalent stress field, strain field, and displacement change of thickness of the wheel steel in each rolling process were analysed, and the field measurement and verification analysis were carried out. Results show that the equivalent stress, strain and thickness displacement of the strip edge gradually increases with the rolling, respectively. Reasonable tension before and after loading can effectively reduce the equivalent stress in the deformation zone and the rolling pressure required during rolling. The difference between the simulated rolling outlet thickness of 7.61 mm and the field measured thickness of 7.69 mm is small, which verifies that the calculation accuracy of the finite element is high. The conclusions obtained in this study provide a basis and reference for the development of similar wheel steel rolling calculation model.

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Section: State Of the Artmentioning

confidence: 99%

Shape Change Simulation Analysis of Wheel Steel in a Four-High Hot Rolling Mill

Liu¹,

Cui²,

Li³

et al. 2022

Int. j. simul. model.

View full text Add to dashboard Cite

show abstract

“…Furthermore, the doubledirection search and look-up table method replacing the quadruple iterative computation, ensures that the computation time is less than 16 ms, which meets online applications 6. CONCLUSION (1) Regarding the crown distribution problem in the initial setting of continuous hot rolling mill, based on a large amount of regression calculation of off-line finite element models, this article conducts the optimization calculation strategy, which accurately describes the state transition, and establishes the dynamic programming-based profile distribution model.…”

Section: Application Effect Of Profile Distribution Modelmentioning

confidence: 99%

“…In order to improve the control quality of the profile control models, scholars have done much study on the models, including coupling deformation of roller and strip, roller thermal expansion and wear model, etc., all of which have achieved comparatively good verification effect [1][2][3][4][5]. However, the crown initialization problem has drawn little attention.…”

Section: Introductionmentioning

confidence: 99%

Research on Crown & Flatness Allocation Strategy of Hot Rolling Mills

Sun¹,

Li²,

Shao³

2016

Int. j. simul. model.

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In order to present the reasonable crown of hot rolling mills, the bend force and shift position should be pre-computed in a reasonable manner, while maintaining a good profile. How to search the optimal crown trajectory in ratio crown range is the key problem. Crown and flatness allocation strategy is researched based on dynamic programming method which has been improved and optimized by the algorithm. The key parameters have been calculated by finite element method and regression calculation method, which can regress the equation of the mechanical crown. Comparing with a real production hot rolling mills, the result of state transition equation shows a perfect availability. Additionally, the parallel computing model and look-up table method have been utilized in dynamic programming calculation program. The results show that the bend force normalization population standard deviation fell from 0.2 to 0.06 and the continuously variable crown (CVC) roll shift position normalization population standard deviation fell from 0.3 to 0.15. The consequences show that the crown and flatness allocation strategy has a better application effect and the computing time is only 16 ms, which proves that the model can be applied online.

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Effect of Internal Stress of Incoming Strip on Hot Rolling Deformation Based on Finite Element and Infinite Element Coupling Method

Liu

Yan

et al. 2018

Metals

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Abstract:Limited by the deficiency of the finite element method (FEM) to deal with infinite domain problems, the traditional FEM rolling model is not suitable enough to study the effect of the complex internal stress of the incoming strip on hot rolling deformation. To solve this problem, the finite element and infinite element (FE-IE) coupling method is adopted, where the finite element is for the rolling area of the strip and the infinite element is for the elastic constraint of the strip end. Based on the improved rolls-strip coupling model, several internal stresses with typical distribution forms are applied to the strip by a programmed user subroutine, and the effect of the internal stress of the incoming strip on hot rolling deformation is evaluated. The results show that under the same average stress, the various distribution forms of internal stress have little effect on the total roll force, mainly because of the average effect. The uniform internal stress decreases the central thickness and quadratic crown of the strip. Under the symmetric stress and asymmetric stress, the thickness of each fiber along the strip width direction is closely related to the magnitude and distribution of the stress deviation (subtract the average stress from the longitudinal stress). Under the quadratic wave stress, the central thickness and quadratic crown vary almost linearly with the amplitude of the stress deviation. The efficiency coefficients obtained can be treated as a theoretical basis for the further development of an accurate prediction model of hot rolling.

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Mixed Scheduled Rolling of High Tensile Strength and Mild Steel Using a High-accuracy Profile Model in Hot Strip Finishing Mill

Cited by 4 publications

References 5 publications

Shape Change Simulation Analysis of Wheel Steel in a Four-High Hot Rolling Mill

Shape Change Simulation Analysis of Wheel Steel in a Four-High Hot Rolling Mill

Research on Crown & Flatness Allocation Strategy of Hot Rolling Mills

Effect of Internal Stress of Incoming Strip on Hot Rolling Deformation Based on Finite Element and Infinite Element Coupling Method

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