Integrated design of roll contours for strip edge drop and crown control in tandem cold rolling mills

Cao, Jian; Chai, Xue-ting; Liu, Yanlin; Kong, Ning; She, Jia; Zeng, Wei

doi:10.1016/j.jmatprotec.2017.09.038

Cited by 65 publications

(33 citation statements)

References 15 publications

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“…Substitute Equation (17) and Equation (19) to Equation 20, we can obtain q ci . When the difference between q ci and q i is higher than the required accuracy, q i needs to be corrected by Equation (21), and then recalculate q ci , until the accuracy is satisfied.…”

Section: Similarly We Can Obtain the Elastic Deflection Of The Intermentioning

confidence: 99%

“…The optimal profile parameters were not determined, although the effect of SmartCrown profile parameters on roll gap control was analyzed in the kinds of literature. Meanwhile, FEM is used as the research method in most of the literature [6,7,14,17,18], so that the calculation takes a long time that is not suitable for the optimization algorithms to determine the optimal profile parameters. Besides, the optimization objective of the roll profile in the literature is relatively single.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Objective Optimization of Intermediate Roll Profile for a 6-High Cold Rolling Mill

Jin

Wei

et al. 2020

Metals

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The multi-objective optimization of the SmartCrown intermediate roll profile for a cold rolling mill was proposed in this paper in order to improve the strip flatness quality. A coupling model of roll profile and strip flatness was established, and the roll gap profile, roll gap crown adjustment range, rolls contact pressure, and strip flatness under different intermediate roll profile parameters were calculated based on the coupling model. The results showed that the roll gap crown adjustment range and rolls contact pressure difference increased with increasing roll profile parameters. The roll profile parameters were multi-optimized based on the non-dominated sorting genetic algorithm II (NSGA-II). The minimum rolls contact pressure difference and maximum roll gap crown adjustment range were taken as the objective function of multi-objective optimization. The optimal roll profile parameters were applied to a six-high five stand tandem cold rolling mills, which improved the flatness quality of the DP780 steel strip.

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Section: Similarly We Can Obtain the Elastic Deflection Of The Intermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimization of Intermediate Roll Profile for a 6-High Cold Rolling Mill

Jin

Wei

et al. 2020

Metals

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show abstract

“…It was designed for a six-high reversal mill with a work roll diameter of 240 mm. Cao et al [7] proposed a single tapered 0.8 mm × 120 mm (height × length) contour for a four-high tandem rolling mill, in which the work roll diameter was 600 mm. Sun et al [8] developed a work roll contour for the first stand of a six-high tandem rolling process.…”

Section: Of 15mentioning

confidence: 99%

Silicon Steel Strip Profile Control Technology for Six-High Cold Rolling Mill with Small Work Roll Radius

Shao

Wang

et al. 2020

Metals

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Due to the requirement of magnetic properties of silicon steel sheets, producing high-precision size strips is the main aim of the cold rolling industry. The tapered work roll shifting technique of the six-high cold rolling mill is effective in reducing the difference in transverse thickness of the strip edge, but the effective area is limited, especially for a high crown strip after the hot rolling process. The six-high mill with a small work roll size can produce a strip with higher strength and lower thickness under a smaller rolling load. At the same time, the profile of the strip can be substantially improved. By advancing a well-established analytical method, a series of simulation analyses are conducted to reveal the effectiveness of a small work roll radius for the strip profile in the six-high cold rolling process. Through the analysis of flattening deformation and deflection deformation on the load, the change rule of the strip profile produced by the work roll with a small roll diameter can be obtained. Combined with theoretical analysis and industrial experiments, it can be found that the improvement effect of the small work roll radius on the profile of the silicon strip is as significant.

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“…six-high universal crown mill (UCM), introduced in Ref. [5,6], a novel X-type six-high (X-6h) mill is proposed.…”

Section: Introductionmentioning

confidence: 99%

Optimization design of a novel X-type six-high rolling mill based on maximum roll system stiffness

2020

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The present investigation devices a novel X-type six-high (X-6h) mill. In addition, parametric models of different roll layouts such as the four-high (4-h), I-type six-high (I-6h), and X-6h mills are established. Three-dimensional (3D) finite element (FE) contact analysis for a strip rolling process is conducted when the mills are subjected to a constant vertical load of 65 kN. Through comparative analysis of von Mises stress, contact stress and elastic deformation displacement in three roll layouts, the rigidity characteristic of each is obtained, and it is found that the proposed X-6h mill has the largest roll gap stiffness. The influence of different roll diameter ratios on the roll gap stiffness of the roll system is investigated, based on which an optimization design model is built. Further, by taking into account the roll gap stiffness of the roll system as the optimization objective, the optimum diameter ratios of backup roll (BUR) to work roll (WR) of the X-6h rolling mill is achieved via the genetic algorithm (GA) optimization method, obtaining the optimum structural parameters of BUR and WR as well. The reliability of the proposed design is verified by manufacturing a prototype mill which produced magnesium alloy and aluminum alloy strips of high quality.

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Integrated design of roll contours for strip edge drop and crown control in tandem cold rolling mills

Cited by 65 publications

References 15 publications

Multi-Objective Optimization of Intermediate Roll Profile for a 6-High Cold Rolling Mill

Multi-Objective Optimization of Intermediate Roll Profile for a 6-High Cold Rolling Mill

Silicon Steel Strip Profile Control Technology for Six-High Cold Rolling Mill with Small Work Roll Radius

Optimization design of a novel X-type six-high rolling mill based on maximum roll system stiffness

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