Front end bending in plate rolling influenced by circumferential speed mismatch and geometry

Philipp, Matthias; Schwenzfeier, Werner; Fischer, Franz Dieter; Wödlinger, R.; Fischer, Chad

doi:10.1016/j.jmatprotec.2006.11.027

Cited by 49 publications

(31 citation statements)

References 8 publications

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“…The neutral point moves to higher values of the reduction ratio with increasing material thicknesses. These types of FEB behavior of the rolled material were reported by Philipp et al 2 However, the FEB behaviors shown in Figure 9 are slightly different from those reported by Philipp et al 2 since Philipp et al did not consider heat flow between the material and the work roll and set the material temperature as constant (1000°C) during rolling.…”

Section: Feb Predicted By the Trained Nnmentioning

confidence: 52%

“…Philipp et al 2 provided a broad overview of FEB behavior during plate rolling. Philipp et al 2 also conducted a two-dimensional finite element (FE) analysis and showed that the bending direction (upward or downward) was dependent on the shape factor, and the circumferential speed difference of the upper and lower work rolls.…”

Section: Introductionmentioning

confidence: 99%

“…The investigations performed to date [1][2][3][4] have focused on accurate predictions of FEB using the FE method and tried to explain the causes and consequences of FEB. One of the main tasks of the engineers in actual plate mills is to develop an in-line control scheme that minimizes FEB, when the material's front end is bent downward or upward during rolling. Hence, the development of an analytical model that explicitly expresses FEB as a function of the rolling parameters is required.…”

Section: Introductionmentioning

confidence: 99%

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Application of neural networks to minimize front end bending of material in plate rolling process

Yang

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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This study proposes an approach that combines a trained neural network with a bisection algorithm to minimize the front end bending of material that occurs during plate rolling. With finite element analysis of plate rolling, front end bending data set was generated under conditions where the three rolling parameters (percentage reduction, entry material thicknesses, and percentage difference in peripheral speed between the top and bottom work rolls) varied at regular intervals. The finite element model was validated by comparing the computed roll forces, with the ones measured from a pilot plate rolling test. The pilot hot plate rolling test, wherein the rotational speeds/rates of two work rolls were independently controlled, was also performed, to validate the proposed approach. The proposed approach predicted the percentage difference in peripheral speed that minimized front end bending of the rolled material within 1 s. When the percentage difference in peripheral speed determined for the selected reduction and entry material thicknesses were input, the measured front end bending was only up to about 5 mm, which is negligible value because the ratio of the front end bending to roll diameter in the pilot plate rolling mill is only 0.0071 (5/700 mm), which is much lower than the ratio (0.02) in an actual plate rolling mill.

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Section: Feb Predicted By the Trained Nnmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application of neural networks to minimize front end bending of material in plate rolling process

Yang

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…They studied the effects of asymmetrical factors, rolling parameters and roll speed mismatch on the strip curvature. Philipp et al 8 investigated the influences of the related mismatch of circumferential speed between the WRs, the entrance thickness of the rolling stock and the draft per pass on the front-end bending. Gudur et al 9 presented a methodology for estimating the coefficient of friction from the asymmetric rolling process.…”

Section: Introductionmentioning

confidence: 99%

Prediction and control of front-end curvature in hot finish rolling process

Lee

Han

Park

et al. 2015

Advances in Mechanical Engineering

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The purpose of this study is to predict the front-end curvature in hot strip finishing mills and to prevent it by controlling the rolling conditions. A theoretical model based on the slab method is developed for predicting the front-end curvature by taking into account the entrance angle of the strip, the friction condition and the back tension. To validate the developed theoretical model, the theoretically obtained curvature value is compared with the results of finite element analysis. Consequently, it is shown that the calculation results of the theoretical model are in good agreement with the measured results of the finite element analysis. Furthermore, a curvature control model based on geometrical and mathematical approaches that can reduce the front-end curvature by the control of the roll speed ratio of the upper to lower rolls is proposed. The proposed curvature control model is verified by finite element analysis, and it is shown that the front-end curvature can be reduced considerably using the proposed model. Therefore, it is concluded that the proposed control model for reducing the front-end curvature in a hot strip finishing mill can be used to improve the quality of the rolled product.

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“…Analyses have been conducted with particular emphasis on differing roll speed and different frictional contacts between the rolls and the deforming metal on the upper and lower surfaces [12,13]. Bending effect due to the related mismatch of circumferential speed between the work rolls can reduce warping amount [14,15].…”

Section: Introductionmentioning

confidence: 99%

Differential Speed Rolling to Reduce Warping in Bimetallic Slab

Lee

Park

Moon

2014

Advances in Mechanical Engineering

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The mismatch of lengthwise elongation due to the difference of deformation resistances between constituent materials of bimetallic slab can cause warping. As the warping of bimetallic slab can lead to poor product shape with reduced productivity, this study focuses on the effect of differential speed rolling on the reduction of warping. The effects of differential speed rolling on the reduction of curvature are mainly performed by FEM based on fundamental processing parameters. Differential speed rolling experiments by using low-weight Al1050/Al6061 bimetallic slab produced by continuous clad casting have also been performed for the validation purpose. As rolling experiments for numerous processing conditions are hard to achieve, limited number of experiments has been performed in this study. Simulation results based on parametric study provide a broad overview on the warping behavior in Al1050/Al6061 bimetallic slab rolling.

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Front end bending in plate rolling influenced by circumferential speed mismatch and geometry

Cited by 49 publications

References 8 publications

Application of neural networks to minimize front end bending of material in plate rolling process

Application of neural networks to minimize front end bending of material in plate rolling process

Prediction and control of front-end curvature in hot finish rolling process

Differential Speed Rolling to Reduce Warping in Bimetallic Slab

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