Coupled approach for flatness prediction in cold rolling of thin strip

Abdelkhalek, Sami; Montmitonnet, Pierre; Legrand, Nicolas; Buessler, Pascal

doi:10.1016/j.ijmecsci.2011.04.001

Cited by 86 publications

(59 citation statements)

References 19 publications

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“…The basic dynamic programming is based on the optimization principle, and achieves the search of overall optimal solution. The precondition is the stages having no after-effect; namely, for the state of a certain given stage, the states of previous stages cannot directly affect its subsequent determination, which only depends on its current state [16].…”

Section: Axial Distribution Model Of Strip Thickness and Coil Radiusmentioning

confidence: 99%

Modelling the Dynamics and Secondary Deformation Behaviour of the Strip with Local Waves in Coiling Process

Sun¹,

Guan²,

Shao³

2016

Int. j. simul. model.

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With the introduction of 3D elastic-plastic deformation, and strip plastic flow factor concept, to analysis of the influence of strip local high points on the ridge-buckle behaviour in coiling process, an elastic-plastic coiling stress and ridge-buckle value model that can be used for online calculation was established. According to comparison and analysis of the influencing factors, uneven distribution of radial and circumferential stress caused by local waves is an important cause of strip ridge-buckle, and the ridge-buckle value increases with increases of local wave size, coil diameter and coiling tension, and significantly with decreases in the strip thickness. The influence of waves with different locations on the ridge-buckle value was analysed. Based on comparison of analysis results obtained by an elastic ridge-buckle value model and ANSYS FEM (finite element method), the accuracy and feasibility of this model have been proved, which will provide theoretical and model support for subsequent reduction of the ridge-buckle defects brought by local waves.

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Section: Axial Distribution Model Of Strip Thickness and Coil Radiusmentioning

confidence: 99%

Modelling the Dynamics and Secondary Deformation Behaviour of the Strip with Local Waves in Coiling Process

Sun¹,

Guan²,

Shao³

2016

Int. j. simul. model.

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“…The complete mechanism is approached by numerical simulations that model the coupling between the thermo-elasto-visco-plastic behavior of the strip and the thermo-elastic behavior of the roll and the post-bite buckling of the strip. For instance Abdelkhalek et al (2011) proposed such a comprehensive model based on an older approach established by Hacquin (1996). The residual stress distribution on a strip section transversal to the rolling direction is called a flatness defect, which can be sufficiently compressive to cause local buckling.…”

Section: Applicationsmentioning

confidence: 99%

“…However, spatial resolution limitations lead to uncertainties near strip edges. Indeed, very local residual stresses are predicted by numerical simulations of the rolling process for instance in the model proposed by Abdelkhalek et al (2011) based on Hacquin (1996. Therefore there is a risk of undetected overtraction at strip edges leading to fracture or very local compression leading to buckling with short wave length (around 1 mm) as shown in principle in Fig.…”

Section: Applicationsmentioning

confidence: 99%

Inverse Cauchy method with conformal mapping: Application to latent flatness defect detection during rolling process

Weisz-Patrault

2015

International Journal of Solids and Structures

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a b s t r a c tIn this paper a semi-analytical inverse Cauchy problem is presented for a finite cylinder with a cylindrical hole under the surface called the detecting roll. Applications to latent flatness defect detection during rolling process are considered. A steel strip wraps at a known angle around the detecting roll. The presented inverse method aims at evaluating the residual stress profile of the strip. The inputs are the displacements and free surface traction at the hole surface and the outputs are the resultant forces per unit length in the contact between the strip and the roll, thus by equilibrium of the strip the residual stress profile is inferred. This paper is based on plane complex elasticity with conformal mapping techniques. Several 2D-computations are performed at several axial positions. This work is theoretical, the measurement device is not available and technical issues are not broached. Some numerical examples with synthetic data are provided in order to evaluate accuracy and noise sensitivity. Results encourage further investigations and technical developments.

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“…Thus, it has already Rolls-strip coupling models are widely used to simulate the rolling deformation. There are two main modelling methods: one establishes the rolls and strip deformation models, respectively, and builds up an iterative calculation between the two models according to the coordination relationship until the pre-set convergence condition is achieved [7,8]. The computing speed of this method is fast, but too many assumptions limit the accuracy of the calculation results.…”

Section: Introductionmentioning

confidence: 99%

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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Coupled approach for flatness prediction in cold rolling of thin strip

Cited by 86 publications

References 19 publications

Modelling the Dynamics and Secondary Deformation Behaviour of the Strip with Local Waves in Coiling Process

Modelling the Dynamics and Secondary Deformation Behaviour of the Strip with Local Waves in Coiling Process

Inverse Cauchy method with conformal mapping: Application to latent flatness defect detection during rolling process

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

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