Numerical Analysis of Intermediate Roll Shifting–Induced Rigidity Characteristics of UCM Cold Rolling Mill

Wang, Qinglong; Ling, Xu; Hu, Yunjian; Sun, Jie; Zhang, Dianhua

doi:10.1002/srin.201700454

Cited by 19 publications

(15 citation statements)

References 41 publications

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“…Among the existing calculation methods, such as the elastic base beam method, [1] the influence coefficient method, [2] the boundary element method, [3] the finite element method (FEM), [4] and the strip element method, [5] the FEM is proven to be an effective and feasible method to tackle the complicated rolling mechanics. [6,7] In recent decades, the strip shape problem in cold rolling has been investigated by many researchers using FEM. Chen and Zou [4] proposed a 2D thickness-variable FEM to calculate the elastic deformation of the roll stack, which was modified by Zhou et al [8] using the inversion of the condensed stiffness matrix.…”

Section: Introductionmentioning

confidence: 99%

Effects of Rolling Force on Strip Shape during Tandem Cold Rolling Using a Novel Multistand Finite Element Model

Lianjie

Xie

Liu

et al. 2021

steel research int.

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In the tandem cold rolling (TCR) process, the work hardening effect has a direct influence on the rolling force, which affects the strip shape, including the strip crown and flatness, significantly. However, previous studies focus on the single finite element (FE) model, ignoring the work hardening effect. To investigate the effect of the rolling force on strip shape, herein, a novel elastic–plastic multistand FE model for the TCR process with consideration of the work hardening effect is proposed for the first time using a segmentation modeling strategy, data transfer technologies, and element remesh technology. The proposed FE model is verified by comparing with industrial experimental results. The effects of rolling force on the strip crown and flatness at each stand are investigated quantitatively using the developed FE model. The results illustrate that the strip crown at 40 mm from the edge (C 40) is in a decreasing trend when the rolling force decreases from stand 1 (S1) to stand 4 (S4). By contrast, interestingly, two opposite trends of C 40 are found at stand 5 (S5). This work provides a fresh perspective on the TCR simulation and contributes to further understanding the effect of the rolling force on the strip shape.

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Section: Introductionmentioning

confidence: 99%

Effects of Rolling Force on Strip Shape during Tandem Cold Rolling Using a Novel Multistand Finite Element Model

Lianjie

Xie

Liu

et al. 2021

steel research int.

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show abstract

“…Nevertheless, based on the existing research results, some problems have been discovered. In most of the research results, the influence of the HAGC system is often overlooked when the vertical vibration of the rolling mill is analyzed [36,37]. In essence, the HAGC system is a nonlinear closed-loop system, which has many factors affecting its stability.…”

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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“…The flatness of the strip is directly affected by the loaded roll gap profile. Therefore, the original roll profile is a decisive factor in flatness control [3,4]. The contact stress concentration between the rolls is generated by the unreasonable design of the original roll profile and then induces the roll spalling and flatness defects, which are shown in Figure 1.…”

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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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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Numerical Analysis of Intermediate Roll Shifting–Induced Rigidity Characteristics of UCM Cold Rolling Mill

Cited by 19 publications

References 41 publications

Effects of Rolling Force on Strip Shape during Tandem Cold Rolling Using a Novel Multistand Finite Element Model

Effects of Rolling Force on Strip Shape during Tandem Cold Rolling Using a Novel Multistand Finite Element Model

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

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

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