Speed and load modes of rolling hollow billet at the wide-strip rolling mill

Radionov, Andrey A.; Karandaev, A. S.; Khramshin, Vadim R.; Andryushin, Igor Yuryevich; Nikolaevich, Gostev Anatoliy

doi:10.1109/meacs.2014.6986841

Cited by 18 publications

(6 citation statements)

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“…This creates a torque overshoot resulting in dynamic speed drop. Literary review and experimental studies have shown the amplitude of such dynamic torque on hot-rolling mills might reach 50 to 100 percent of the steady-state torque [2][3][4][5][6]. This in its turn results in premature wear-out and breakages in mechanical equipment, especially in spindle heads.…”

Section: Introductionmentioning

confidence: 99%

Constraining the dynamic torque of a rolling mill stand drive

Gasiyarov¹,

Khramshin²,

Гасияров³

et al. 2018

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We herein consider issues of limiting the dynamic loads in the electromechanical systems of horizontal rolls in the stand of a plate mill. It is shown that shock loads mainly occur during gripping due to gaps in spindle connections; the size of the gap depends on how worn-out those spindles are. We analyze a method of limiting such dynamic loads that consists in gripping workpieces while accelerating the electric drive. We also task ourselves to prove the feasibility of implementing this method at the 5000 rolling mill employed by PJSC Magnitogorsk Iron and Steel Works (MMK). We present the oscillograms of workpiece gripping in accelerated and decelerated modes; those oscillograms prove how efficient pre-setting the gap size is. The paper contains a control chart that ensures electric drive acceleration before gripping. We have developed a mathematical model of the dual-mass electromechanical roll system for reversing stands and present herein the parameters of the simulated object. The proposed dynamic load limitation has been simulated. We herein specify a minimum timeframe between the onset of pre-acceleration and the load application moment, which timeframe is necessary for angular gaps to be fully closed. The timeframe value is explained. We have also implemented the developed speed control algorithms in the APCS of the 5000 rolling mill stand. The paper presents the torque and speed oscillograms for the workpiece gripping. It is proved that the torque overshoots in the upper-and lower-roll electric drives is reduced to acceptable levels by this method. We also analyze the oscillograms of the lower-roll drive parameters obtained over nine reversing-rolling passes. It is confirmed that the dynamic torque of grip does not exceed 25% of the steady-state torque. We thus conclude that this speed control method has proven efficient for the stand electric drives of the 5000 mill. Expanded implementation of this method in the existing hot-rolling mills is noted as practical.

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Section: Introductionmentioning

confidence: 99%

Constraining the dynamic torque of a rolling mill stand drive

Gasiyarov¹,

Khramshin²,

Гасияров³

et al. 2018

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“…Вопросы, связанные с разработкой электроприводов и систем управ-ления непрерывной подгруппы черновой группы исследо-ваны в [12][13][14][15][16][17]. При этом значительное внимание уделено математическому моделированию поведения металла в очагах деформации и межклетевых промежутках в режиме последовательного захвата волосы вертикальными и гори-зонтальными валками универсальных клетей [18][19][20].…”

Section: Introductionunclassified

Load modes of mill 2000 electric drives at rolling hollow billet

2016

RIJEE

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“…Причиной несогласованности являются недостаточная точность вычисления и задания скоростных режимов. Кроме того, в двухконтурной системе регулирования скорости электроприводов клетей при изменении нагрузки возникают статическая и динамическая ошибки регулирования скорости, которые не контролируются и не регулируются [3,4]. Мгновенный подпор, формирующийся в полосе во время ее захвата валками последующей клети, воспринимается валками предыдущей клети в виде дополнительного сопротивления.…”

Section: Introductionunclassified

Mathematical modelling of the interrelated electric and mechanical systems of continuous sub-group of the rolling mill stands (part 1. Development of the mathematical model)

2015

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Speed and load modes of rolling hollow billet at the wide-strip rolling mill

Cited by 18 publications

References 0 publications

Constraining the dynamic torque of a rolling mill stand drive

Constraining the dynamic torque of a rolling mill stand drive

Load modes of mill 2000 electric drives at rolling hollow billet

Mathematical modelling of the interrelated electric and mechanical systems of continuous sub-group of the rolling mill stands (part 1. Development of the mathematical model)

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