Manifested flatness defect prediction in cold rolling of thin strips

Nakhoul, Rebecca; Montmitonnet, Pierre; Legrand, Nicolas

doi:10.1007/s12289-014-1166-y

Cited by 27 publications

(12 citation statements)

References 15 publications

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“…LAM3, a software package jointly developed by a consortium composed of Cemef, Transvalor, Arcelor Research and Alcan, solves the strip elasto-plastic strain by a 3D implicit FE procedure, and the roll stack elastic deformation by semianalytic models. LAM3 adopts an updated Lagrangian formulation with stationary and non-stationary versions (see, e.g., [43][44][45][46] for more details). The process consists in rolling a thin sheet metal, with a rolling velocity of the order of 1000 mm/s.…”

Section: Simulation Using the Fe Code Lam3mentioning

confidence: 99%

Investigation of the effect of temper rolling on the texture evolution and mechanical behavior of IF steels using multiscale simulation

et al. 2015

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract The main objective of this study is to simulate texture and deformation during the temper-rolling process.To this end, a rate-independent crystal plasticity model, based on the self-consistent scale-transition scheme, is adopted to predict texture evolution and deformation heterogeneity during temper-rolling process. For computational efficiency, a decoupled analysis is considered between the polycrystalline plasticity model and the finite element analysis for the temper rolling. The elasto-plastic finite element analysis is first carried out to determine the history of velocity gradient during the numerical simulation of temper rolling. The thus calculated velocity gradient history is subsequently applied to the polycrystalline plasticity model. By following some appropriately selected strain paths (i.e., streamlines) along the rolling process, one can predict the texture evolution of the material at the half thickness of the sheet metal as well as other parameters related to its microstructure. The numerical results obtained by the proposed strategy are compared with experimental data in the case of IF steels.

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Section: Simulation Using the Fe Code Lam3mentioning

confidence: 99%

Investigation of the effect of temper rolling on the texture evolution and mechanical behavior of IF steels using multiscale simulation

et al. 2015

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“…The other established modeling method is also based on FEM and has been widely employed by many researchers for rolling simulations, due to the increased quality of the results and the possibility to apply realistic boundary conditions and constraints in complicated models [12][13][14][15][16][17][18]. The method has been effectively applied for the prediction of strip crown in both cold and hot rolling operation.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Plate Crown during Aluminum Hot Flat Rolling by Finite Element Modeling

Gavalas

Papaefthymiou

2019

JMMP

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The roll deflection during hot rolling can result in uneven thickness distribution across the width of a plate (crown). A conventional rolling mill is equipped with bending systems that can control this convex shape of the plate. However, the determination of the proper bending load is very complicated as the plate crown is influenced by the rolling conditions. In this paper, a thermo-mechanical Finite Element Model on LS-DYNA™ software was utilized to predict crown evolution based on the rolling conditions in order to determine the setting values for achieving the target crown. The simulation results were compared and verified with actual industrial data for rolling force, plate temperature and plate crown. This approach is essential for pass schedule design and process parameter optimization in order to achieve the desired product quality.

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“…Weiss et al analysed the rolling process using finite element analysis, determined the distribution of residual stresses, and obtained the theoretical moment curvature characteristics using the output of this analysis as the input to the modelling for pure bending [15]. Nakhoul et al used a coupled finite element method to compute stresses and strains in-bite and out-of-bite in cold rolling of thin strips and predicted the manifested flatness defect, taking into account the stress field in the pre-and post-bite areas reorganized by the buckling [16]. Mathieu et al introduced a numerical modelling of strip conveying through an industrial leveller using FEM software and predicted the final strip shape from plastic strains and residual stresses via width and thickness [17].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Residual Stress Based on Curvature Coupling in Multi-Roll Levelling

Liang

Wang

et al. 2019

Applied Sciences

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Residual stress is the main cause of flatness defects in sheet metal and the basic method to improve the shape quality of the sheet is to reduce and eliminate the residual stress by multi-roll levelling. The curvature coupling between repeated sheet bendings in multi-roll levelling greatly affects the accuracy of the analysis of the residual stress evolution, which is rarely considered in current research. Aiming to address this problem, a method for eliminating residual stress by multi-roll levelling based on curvature coupling is discussed in this article. An evaluation criterion and an analysis model are proposed to investigate the evolution of the residual stress in multi-roll levelling considering the curvature coupling between bendings. The effects of the intermesh of the work rolls and the plastic deformation of the sheet on the residual stress are also discussed. The results show that multi-roll levelling will cause rolling residual stress while reducing the initial residual stress of the sheet and the larger plastic deformation caused by the intermesh of the work rolls at the entry is beneficial for the complete elimination of the initial residual stress, but the rolling residual stress will increase at the same time. Therefore, the total residual stress of the sheet after levelling depends on the appropriate levelling parameters.

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Manifested flatness defect prediction in cold rolling of thin strips

Cited by 27 publications

References 15 publications

Investigation of the effect of temper rolling on the texture evolution and mechanical behavior of IF steels using multiscale simulation

Investigation of the effect of temper rolling on the texture evolution and mechanical behavior of IF steels using multiscale simulation

Prediction of Plate Crown during Aluminum Hot Flat Rolling by Finite Element Modeling

Evolution of Residual Stress Based on Curvature Coupling in Multi-Roll Levelling

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