Spatial vibration characteristics of six-high cold strip rolling mills

Zheng, Yuhong; Li, Y. G.; Shen, Guang Xian; Xie, Mengxue

doi:10.1080/03019233.2017.1410966

Cited by 9 publications

(3 citation statements)

References 17 publications

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“…In the metallurgical industry, the rolling mill represents a core piece of equipment. However, it has been found that there are always some parameter changes or disturbance factors during the rolling process, which may induce vibration in the rolling mill [1,2]. This may even cause the load roll system to produce vertical vibration with large amplitude, leading to production accidents such as steel-heaping, strip breakage, component damage and so on [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Bifurcation Characteristic Research on the Load Vertical Vibration of a Hydraulic Automatic Gauge Control System

et al. 2019

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As the core control system of a rolling mill, the hydraulic automatic gauge control (HAGC) system is key to ensuring a rolling process with high speed, high precision and high reliability. However, a HAGC system is typically a mechanical-electric-hydraulic coupling system with nonlinear characteristics. The vertical vibration of the load easily occurs during the working process, which seriously affects the stability of the system and the causes are difficult to determine. In this work, the theory and method of nonlinear dynamics were employed. The load vertical vibration model of the HAGC system was established. Then, the multi-scale method was utilized to solve the obtained model, and the singularity theory was further applied to derive the transition set. Moreover, the research object of this article focused on some nonlinear factors such as excitation force, elastic force and damping force. The effects of the above feature parameters on bifurcation behavior were emphatically explored. The bifurcation characteristic of the load vertical vibration of the HAGC system was revealed. The research results indicate that the bifurcation curves in each sub-region, divided by the transition set, possess their own topological structure. The changes of the feature parameters, such as the nonlinear stiffness coefficient, liquid column height, nonlinear damping coefficient, and external excitation have an influence on the vibration amplitude of the HAGC system. By reasonably adjusting the nonlinear stiffness coefficient to effectively avoid the resonance region, the stability of the system will be facilitated. Furthermore, this is conducive to the system’s stability as it properly controls the size of the liquid column height of the hydraulic cylinder. The appropriate nonlinear damping coefficient can decrease the unstable area, which is beneficial to the stability of the system. However, large external excitation is not conducive to the stability of the system.

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Section: Introductionmentioning

confidence: 99%

Bifurcation Characteristic Research on the Load Vertical Vibration of a Hydraulic Automatic Gauge Control System

et al. 2019

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“…Sun et al [5] and Wu et al [6] developed a theoretical model for mixed lubrication and analysed the effects of surface roughness, rolling speed, rolling reduction, and rolling oil viscosity on oil film thickness in the deformation zone. Fujita et al [7], Wei et al [8], and Zheng et al [9] improved the vibration stability by controlling the lubricity in high speed cold rolling. Bai et al [10] developed an optimization technology of emulsion flow to minimize the overall fluctuation of rolling pressure during speed acceleration and deceleration in the rolling process.…”

Section: Introductionmentioning

confidence: 99%

“…[8], and Zheng et al. [9] improved the vibration stability by controlling the lubricity in high speed cold rolling. Bai et al.…”

Section: Introductionmentioning

confidence: 99%

Model and influence factors of oil film thickness in the deformation zone of double cold reduction mill

Cui

et al. 2019

Ironmaking & Steelmaking

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In the double cold rolling process, oil film thickness in the deformation zone is a key parameter for evaluating rolling lubricity. This study investigated the formation and variation mechanism of oil film thickness on the strip and work roll surface in double cold reduction mill. Subsequently, a calculation model of oil film thickness in the deformation zone of double cold reduction mill was established by combining of the plate out theory and hydrodynamic lubrication principle. Moreover, the influence of emulsion flow, emulsion concentration, emulsion plate out distance, rolling speed, bite angle, entry deformation resistance, back tension, oil initial kinetic viscosity, and oil pressure viscosity coefficient on the oil film thickness were quantitatively analysed. The oil film thickness was achieved with an accuracy greater than 90% through a field application of this calculation model, which provides theoretical foundation for the lubricity control of double cold reduction rolling.

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A Method for Three-Dimensional Deformation Predictions in the Rolling of Steel Strips

Niu

2019

Metall Mater Trans B

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Spatial vibration characteristics of six-high cold strip rolling mills

Cited by 9 publications

References 17 publications

Bifurcation Characteristic Research on the Load Vertical Vibration of a Hydraulic Automatic Gauge Control System

Bifurcation Characteristic Research on the Load Vertical Vibration of a Hydraulic Automatic Gauge Control System

Model and influence factors of oil film thickness in the deformation zone of double cold reduction mill

A Method for Three-Dimensional Deformation Predictions in the Rolling of Steel Strips

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