Air jet impingement to reduce hot strip wave on a run-out table

Woo, Young Yun; Han, Sang Wook; Cho, Jin-Rae; Moon, Young Hoon

doi:10.1051/meca/2018037

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…However, there is a lack of systematic research on water flow arrangement in water flow center crown cooling. Up to now the phenomenon of edge wave in hot-rolled strip during the run-out table cooling has been studied extensively [24][25][26]. Hence, center wave compensation control is that strip is rolled with appropriate center wave at the exit of finishing mill to compensate the edge wave defect during the cooling stage.…”

Section: Introductionmentioning

confidence: 99%

Residual stress control of hot-rolled strips during run-out table cooling

Sun

Wen

et al. 2023

Int J Adv Manuf Technol

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The strips with good flatness after finish rolling will have flatness defects such as edge wave after run-out table cooling. These defects are caused by the residual stress due to inhomogeneous thermal and microstructural behaviors during the cooling stage.The traditional residual stress control methods rely too much on experience, resulting in poor control effect and poor universality. Therefore, this study proposed two residual stress control methods based on model calculation: water flow central crown, and center wave compensation control. The former is mainly based on controlling the uniformity of strip transverse temperature and microstructure. The latter is mainly controlled by mutual compensation of internal stresses. In this paper, the mathematical models of water flow central crown cooling and critical center wave compensation stress were established respectively. Meanwhile, a post-buckling model of hot-rolled strip was established to calculate the aim flatness value at exit of finishing mill under critical compensation stress. Furthermore, a fully coupled finite element model based on temperature, phase transitions, and stress was developed and it was verified using experimental data. Finally, the above two residual stress control methods were realized in the finite element model. The results showed that the two methods can reduce the residual stress and improve the flatness, and the application of center wave compensation control is more effective.

show abstract

Section: Introductionmentioning

confidence: 99%

Residual stress control of hot-rolled strips during run-out table cooling

Sun

Wen

et al. 2023

Int J Adv Manuf Technol

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show abstract

“…The high quality metal strips, such as aluminum auto body sheet (ABS), aviation aluminum-alloy, high precision electronic copper strip, and silicon steel, etc., are widely used in the high-end manufacturing industry, power industry, and information technology industry [1], [2]. The production process of strips needs to meet three technological requirements: a) high heating efficiency, b) high temperature uniformity, and c) contactless heat treatment [3]. With the high heating efficiency, temperature control precision and product surface quality, the air cushion furnace becomes an indispensable equipment in the production process of the high quality metal strips [4].…”

Section: Introductionmentioning

confidence: 99%

Hard-Division and Multi-Model Based Floating Height Prediction for Air Cushion Furnace With Hybrid Nozzles

et al. 2020

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The strip floating height is a key factor affecting production efficiency and quality of the air cushion furnace. At present, the air cushion furnace with hybrid nozzles is the most typical heating and drying equipment. In order to predict the floating height of the strip in this equipment, a hard-division and multi-model based floating height prediction method is proposed. In hard division method, the process is divided into several stable and vibration stages. On the one hand, time interval based novel density clustering algorithm is proposed so as to avoid the wrong division caused by noise at hard division stage. On the other hand, covariance matrices based local density is presented to better capture dynamic characteristics of the process. In the multi-model stage, a hybrid prediction model under stable state and XGBoost-based model under vibration state are established to predict the strip floating height. The hybrid prediction model is composed of mechanism model and data driven model. The mechanism model is proposed by combining the force balance equation and inviscid theory which can predict the major information of the floating height and the data driven model compensates the error of the mechanism model. A mount of experiments have been carried out on the existing air cushion experimental platform and show desirable prediction effect.

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Residual stress control of hot-rolled strips during run-out table cooling

Wu¹,

Sun

Wen³

et al. 2022

Preprint

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The strips with good flatness after finish rolling will have flatness defects such as edge wave after run-out table cooling. These defects are caused by the residual stress due to inhomogeneous thermal and microstructural behaviors during the cooling stage. The traditional residual stress control methods rely too much on experience, resulting in poor control effect and poor universality. Therefore, this study proposed two residual stress control methods based on model calculation: water flow central crown, and center wave compensation control. The former is mainly based on controlling the uniformity of strip transverse temperature and microstructure. The latter is mainly controlled by mutual compensation of internal stresses. In this paper, the mathematical models of water flow central crown cooling and critical center wave compensation stress were established respectively. Meanwhile, a post-buckling model of hot-rolled strip was established to calculate the aim flatness value at exit of finishing mill under critical compensation stress. Furthermore, a fully coupled finite element model based on temperature, phase transitions, and stress was developed and it was verified using experimental data. Finally, the above two residual stress control methods were realized in the finite element model. The results showed that the two methods can reduce the residual stress and improve the flatness, and the application of center wave compensation control is more effective.

show abstract

Air jet impingement to reduce hot strip wave on a run-out table

Cited by 3 publications

References 25 publications

Residual stress control of hot-rolled strips during run-out table cooling

Residual stress control of hot-rolled strips during run-out table cooling

Hard-Division and Multi-Model Based Floating Height Prediction for Air Cushion Furnace With Hybrid Nozzles

Residual stress control of hot-rolled strips during run-out table cooling

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