A kinematic analytical approach to predict roll force, rolling torque and forward slip in thin hot strip continuous rolling

Bayoumi, Laila S.

doi:10.1179/174328107x203822

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…Therefore, accurate prediction of the rolling force and the forward slip is a key issue in obtaining better control of production line in tandem cold rolling. There have been many researchers proposing different methods to predict the rolling force and forward slip which can be divided into two groups: the direct method and the indirect method [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A novel approach to improve the computing accuracy of rolling force and forward slip

Yan

Zhang

2017

Ironmaking & Steelmaking

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In cold strip rolling control system, rolling force and forward slip are the prerequisites for the model setting calculation, and the deformation resistance and friction coefficient are the main parameters that affect their predictions. A new method based on objective function is first proposed in this paper to improve the calculation accuracy of rolling force and forward slip, and the deformation resistance and friction coefficient are taken as optimisation variables. Using the multi-population co-evolutionary algorithm to solve the objective function, the required rolling force and forward slip are obtained. The pre-set values of rolling force and roller line speed are compared with the actual measured ones in a 1450 mm five-stand tandem cold mill and other researcher's method. Results show that the calculated values are in fair agreements with the on-line measured ones, and the thickness and flatness accuracy of the final product are improved.

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Section: Introductionmentioning

confidence: 99%

A novel approach to improve the computing accuracy of rolling force and forward slip

Yan

Zhang

2017

Ironmaking & Steelmaking

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“…Pawelski [12] introduced an explicit analytical method for determining the forward slip during cold strip rolling, which reproduced most predictions of classic strip theory, except for extreme cases, such as in the foil rolling regime or for skin pass rolling. Bayoumi [13] developed a kinematic analytical approach to predict the forward slip in hot strip rolling based on formulating a velocity field in the roll bite zone that considers the effect of interfacial friction on the distribution of the axial velocity and longitudinal stresses across the strip thickness. This method could yield accurate results, compared with those of the finite element simulation, and was suitable for use in online control because of the drastic reduction in computational time.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Forward Slip in Micro Flexible Rolling of Thin Aluminium Strips

Jiang

2019

Metals

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This study delineates a novel finite element model to consider a pattern of process parameters affecting the forward slip in micro flexible rolling, which focuses on the thickness transition area of the rolled strip with thickness in the micrometre range. According to the strip marking method, the forward slip is obtained by comparison between the distance of the bumped ridges on the roll and that of the markings indented by the ridges, which not only simplifies the calculation process, but also maintains the accuracy as compared with theoretical estimates. The simulation results identify the qualitative and quantitative variations of forward slip with regard to the variations in the reduction, rolling speed, estimated friction coefficient and the ratio of strip thickness to grain size, respectively, which also locate the cases wherein the relative sliding happens between the strip and the roll. The developed grain-based finite element model featuring 3D Voronoi tessellations allows for the investigation of the scatter effect of forward slip, which gets strengthened by the enhanced effect of every single grain attributed to the dispersion of fewer grains in a thinner strip with respect to constant grain size. The multilinear regression analysis is performed to establish a statistical model based upon the simulation results, which has been proven to be accurate in quantitatively describing the relationship between the forward slip and the aforementioned process parameters by considering both correlation and error analyses. The magnitudes of each process parameter affecting forward slip are also determined by variance analysis.

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“…The specific control mode is to adjust the gap to control tension and to change the speed to control thickness, which is not sufficient to deal with the coupling problem between tension and thickness. Hence, many researchers have investigated ways to achieve better control of the tandem cold rolling process [1][2][3]. To improve the automatic gauge control (AGC) performance of thickness subsystem, Sun et al [4] designed a fuzzy self-tuning PID controller and optimized monitor AGC.…”

Section: Introductionmentioning

confidence: 99%

Optimal control of tension and thickness for tandem cold rolling process based on receding horizon control

Sun

Chen

et al. 2019

Ironmaking & Steelmaking

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Tandem cold rolling is a high-speed, high-efficiency, and complex production process. In some cases, minor interference or disoperation may result in large economic losses. To improve control performance and enhance system robustness, an optimal tension and thickness control method is presented in this paper. The control method is designed based on the receding horizon control (RHC) strategy, which has good tracking performance and strong constraint handling capability. First, a state space model is constructed to describe the tension and thickness of the tandem cold rolling process. Then, according to the system model, a RHC controller is designed and introduced into the control system. Based on field data, model verification and a series of experiments are completed. The results show that the proposed RHC control strategy can effectively reduce the effects of disturbances and has excellent control performance compared with the conventional proportion and integration (PI) control strategy.

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A kinematic analytical approach to predict roll force, rolling torque and forward slip in thin hot strip continuous rolling

Cited by 7 publications

References 7 publications

A novel approach to improve the computing accuracy of rolling force and forward slip

A novel approach to improve the computing accuracy of rolling force and forward slip

Finite Element Analysis of Forward Slip in Micro Flexible Rolling of Thin Aluminium Strips

Optimal control of tension and thickness for tandem cold rolling process based on receding horizon control

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