Influence of profile indicators of hot-rolled strip on transverse thickness difference of cold-rolled silicon steel

Ma, Xiaobao; Wang, Dongcheng; Liu, Hong‐Min; Zhang, Shuai

doi:10.1051/metal/2018044

Cited by 12 publications

(9 citation statements)

References 12 publications

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“…In truth, the original data always comprise lots of noise and outliers, which may bring about misleading predictions. In addition, the predicted data based on the prediction model have strong correspondence to the measured data [22]. In the Fig.…”

Section: Fig5 Framework Of Strip Crown Predictionsupporting

confidence: 52%

Application of support vector machine for the prediction of strip crown in hot strip rolling

Song

Yuan

et al. 2020

Preprint

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In order to enhance the prediction accuracy of the strip crown and improve the quality of final product in the hot strip rolling, an optimized model based upon support vector machine (SVM) is proposed firstly. Meanwhile, for purposes of enriching data information and ensuring data quality, the actual data from a hot-rolled plant are collected to establish prediction model, as well as the prediction performance of models was evaluated by using multiple indicators. Besides, the traditional SVM model and the combined prediction models with the particle swarm optimization (PSO) and the cuckoo search (CS) optimization algorithm are also proposed. Furthermore, the prediction performance comparisons of the three different methods are discussed and validated. The results show that the CS-SVM has the highest prediction accuracy compared to the other two methods, and the root mean squared error (RMSE) of the proposed CS-SVM is 2.05µm, and 98.11% of prediction data have an absolute error below 4.5μm. In addition, the results also demonstrated that the CS-SVM not only with faster convergence speed and higher prediction accuracy but can be well applied to the actual hot strip rolling production.

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Section: Fig5 Framework Of Strip Crown Predictionsupporting

confidence: 52%

Application of support vector machine for the prediction of strip crown in hot strip rolling

Song

Yuan

et al. 2020

Preprint

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“…A full set of VCR configuration of seven stands for finishing rolling can maintain the stability of finishing rolling profile and improve roll wear and strip steel section quality, so that local profile defects of strip are effectively suppressed. 3. SVT work roll is adopted to cooperate with the long stroke intelligent shifting technology in the downstream stands to maximize the uniform roll wear, directly control the shape of the strip edge, reduce the crown and edge drop of the strip at the exit of finishing rolling, and improve the crown hit ratio.…”

Section: Discussionmentioning

confidence: 99%

“…Wang et al [2] believed that the hot-rolled shape of silicon steel affects the size of cold-rolled strip steel; on this basis, the proposed rectangular section control technology is a solution of silicon steel strip shape (including crown, wedge, local peak point, and flatness) throughout the whole process of strip rolling: the hot tandem rolling process includes high-performance variable crown work roll technology in the upstream stands and limited shifting technology for scheduling-free rolling in the downstream stands, while the cold continuous rolling process includes edge varying contacts work roll technology, as well as strip edge-drop setting and closed-loop control technology. Ma et al [3] analyzed the influence of the section shape of hotrolled silicon steel strip on transverse thickness difference of cold-rolled finished strip. The traditional shape control of the silicon steel strip is close to the process of finished strip steel-cold rolling process.…”

Section: Introductionmentioning

confidence: 99%

Research and application of approximate rectangular section control technology in hot strip mills

Shao

Wang

et al. 2021

J. Iron Steel Res. Int.

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Profile requirements of silicon steel strip are extremely high and the thickness difference of cold-rolled products is usually less than 7 lm, and the profile quality of hot-rolled strip is the key to ensure the thickness difference of cold-rolled products. In order to produce the silicon steel strip with high-precision shape, the concept of quasi-rectangular rolling during hot continuous rolling was put forward; the equipment configuration and technical method of approximate rectangular section control were studied. Through the roughing multi-target load distribution technology and the roll configuration technology for uniform wear of a 4-high rolling mill, the strip crown of transfer bar was reduced and the profile control stability was guaranteed. Configuring variable contact back-up roll technology on all stands in the finishing rolling process, equipped with symmetry variable taper work roll and long-stroke intelligent shifting strategy in the downstream stands, and using side rolling lubrication technology can make the roll wear more uniform, reduce the edge drop of silicon steel strip, improve the profile quality, and make the strip section of finishing exit ''quasi-rectangular''. In addition, induction furnace and side heater were also equipped to guarantee the temperature uniformity of the strip, so as to improve the stability of profile control. The whole control technology is based on the 1580-mm hot continuous rolling production line, designed, and developed according to the characteristics of equipment and products, and has been successfully applied, which can obtain the approximate rectangular strip section satisfying the flatness quality, and improve the strip section precision of silicon steel and other products.

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“…Abdelkhalek et al [33] reported that the edge drop causes a slight decrease in wavelength during the cold thin strip rolling. The transverse thickness difference of the cold-rolled strip increases nonlinearly with the wedge of the hot-rolled strip [5]. Therefore, the quantitative study about the effects of entry strip edge drop or even wedge on strip flatness will be carried out in future work.…”

Section: The Strip Crown Inheritance Factor At Stands S1 and S5mentioning

confidence: 99%

“…Zhang et al [3] and Yu et al [4] discovered that increasing the entry strip crown causes an increase in the exit strip crown and the edge drop in a universal crown control mill (UCM mill) and a 20-high Sendzimir mill, respectively. Ma et al [5] carried out a numerical analysis about the influence of the hot-rolled strip profile on transverse thickness difference (TTD) of cold-rolled silicon steel, and found that the TTD of the cold-rolled strip has a nearly linear relationship with the C 40 (crown at 40 mm from the strip edge) of the hot-rolled strip without wedge, while the TTD of cold-rolled strip increases nonlinearly with the W 40 (wedge at 40 mm from the strip edge) at a certain C 40 . Using the same method, Wang et al [6] also found that the TTD of cold-rolled strip increases with the C 25 (crown at 25 mm from the strip edge) of the hot-rolled strip when the C 40 remains constant and the ratio of C 40 to C 25 varies.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the strip crown inheritance in tandem cold rolling by a novel 3D multi-stand FE model

Xie

Liu

et al. 2022

Int J Adv Manuf Technol

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The strip shape inheritance model is widely applied to improve the strip shape quality in tandem cold rolling (TCR). However, the inheritance mechanism is still currently unclear. To bridge this gap, this paper presents a new numerical method for calculating the strip crown inheritance factor. In addition, the effects of the entry strip crown on exit strip crown and flatness were quantitatively analysed at each stand in the TCR using a novel three-dimensional (3D) multi-stand elastic–plastic finite element (FE) model. The results show that the strip crown inheritance factor increases slowly from S1 (stand 1) to S3 (stand 3), while rising sharply from S3 to S5 (stand 5), reaching a peak value of 0.495 μm/μm at S5. This trend coincides with that of strip plastic rigidity, which verifies that the strip crown inheritance factor is dependent on the strip plastic rigidity. Furthermore, the variation of strip crown and flatness under different entry strip crowns from S1 to S5 is jointly influenced by the pass reduction and strip plastic rigidity. Moreover, the strip crown inheritance factor increases with the deformation resistance of the strip at both S1 and S5. These findings not only offer a fresh perspective to understand the mechanism of strip crown inheritance, but also provide an important basis for optimising the strip shape control in the TCR process.

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Influence of profile indicators of hot-rolled strip on transverse thickness difference of cold-rolled silicon steel

Cited by 12 publications

References 12 publications

Application of support vector machine for the prediction of strip crown in hot strip rolling

Application of support vector machine for the prediction of strip crown in hot strip rolling

Research and application of approximate rectangular section control technology in hot strip mills

Numerical analysis of the strip crown inheritance in tandem cold rolling by a novel 3D multi-stand FE model

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