Experimental Investigations and ALE Finite Element Method Analysis of Chatter in Cold Strip Rolling

Niroomand, Mohammad Reza; Forouzan, Mohammad Reza; Salimi, M.; Shojaei, Hamid R.

doi:10.2355/isijinternational.52.2245

Cited by 21 publications

(13 citation statements)

References 29 publications

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“…According to previous research of the authors, 22) in which explicit finite element method has been used, the effect of the wave propagation was found to be important in the chatter phenomenon. According that stress wave propagation is taken into account only in dynamic finite element method, finite element analysis is used to evaluate the wave propagation theory.…”

Section: Wave Propagation In Rolling Chattermentioning

confidence: 95%

“…Niroomand et al 22) utilized a finite element model of the chatter vibrations in rolling, which relaxes many assumptions of analytical models. This model has the benefit of mass translation to the computational region by using Arbitrary Lagrangian Eulerian (ALE) technique, which tremendously reduces huge computational requirements of common Lagrangian models.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical and Experimental Analysis of Chatter in Tandem Cold Rolling Mills Based on Wave Propagation Theory

2015

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In this paper, a new theory is introduced to explain chatter mechanism based on wave propagation in elastic solids. It is believed that previous theories in chatter are based on a static analysis and normally are consistent just for low-frequency vibrations such as forced vibration. But chatter phenomenon is a dynamic high-frequency event and requires a consistent theory with a dynamic analysis. In this research, variations of inter-stand tensions are calculated based on wave propagation theory. Predicted results by wave propagation theory were evaluated by dynamic finite element method in a benchmark problem. Results show that wave propagation theory is consistent by dynamic finite element method, but previous theories are not sufficiently accurate in chatter conditions. Hereafter, a numerical model is constituted to simulate the vibrational behavior of a tandem rolling mill. Parameters for numerical simulations are adopted from an industrial two-stand tandem mill. Consequently, results of the analytical model are compared with the experimental measurements from that full scale industrial mill. Two main chattering characteristics, i.e., critical rolling speed and chatter frequency, obtained from the simulation program were found to be more consistent with the experimental results when considering the dynamic effects.

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Section: Wave Propagation In Rolling Chattermentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Analysis of Chatter in Tandem Cold Rolling Mills Based on Wave Propagation Theory

2015

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“…Substituting equations (7), (14), (15) and (18) into equation (5) leads to the resultant dynamic component of the rolling force P var = p 1 y + p 2 y 2 + p 3 y 3 + p 4 u…”

Section: Dynamic Component Of the Rolling Forcementioning

confidence: 99%

Stability of the coupled vibrations of work roll and strip in cold rolling process

2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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Undesirable vibrations that occurred in cold rolling mills, widely known as chatter, are studied in this article by considering the interaction of three types of vibrations, namely, the longitudinal vibration of the rolled strip and the torsional and vertical vibrations of the upper work roll. The dynamic component of rolling force is determined using the quasi-static model under the assumption that the changes in roll gap and strip tension produce the variation of rolling force. The coupled vibrations of the work roll and rolled strip are mathematically governed by a set of 3-degree-of-freedom nonlinear equations. Under chatter conditions, a new variable is introduced to represent the motion of the quasi-neutral point. A stability criterion for the motion of the quasi-neutral point is developed by studying the eigenvalues of the corresponding characteristic equation of the linearized parts of the non-linear equations. The chatter stability can then be examined by evaluating the determinants of five matrices. Numerical examples are given to show the stable and unstable vibrations in the cold rolling process. The unstable vibration would lead to skidding phenomenon and even break the rolled strip. The results presented in this article provide new insights into the dynamic interaction of the coupled vibrations and the dynamics of the rolling process.

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“…This method has been applied in the cold and hot rolling process for the first time by the authors. 1,35) Specifications of the rolling mill under consideration are presented in Table 1. It also presents characteristics of the strip in the third pass.…”

Section: Mil Specificationsmentioning

confidence: 99%

Development of a Rolling Chatter Model Considering Unsteady Lubrication

2014

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Chatter, limiting the rolling speed for thin steel strips, has been identified as a serious limitation in increasing the efficiency of the cold rolling process. Many experimental investigations have led to the point that lubrication is one of the effective factors causing chatter. In this article, a new chatter model of the cold strip rolling with consideration of unsteady lubrication is proposed. The limiting shear stress concept and the variation of the lubricant viscosity with pressure are considered in this model. The results of the simulation are verified by comparing to experimental data. Also, a parametric study on the effect of some of the major parameters of rolling lubricant on the chatter critical speed is conducted. The results show that under the operating conditions of this paper, the limiting shear stress is an effective parameter.

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Experimental Investigations and ALE Finite Element Method Analysis of Chatter in Cold Strip Rolling

Cited by 21 publications

References 29 publications

Theoretical and Experimental Analysis of Chatter in Tandem Cold Rolling Mills Based on Wave Propagation Theory

Theoretical and Experimental Analysis of Chatter in Tandem Cold Rolling Mills Based on Wave Propagation Theory

Stability of the coupled vibrations of work roll and strip in cold rolling process

Development of a Rolling Chatter Model Considering Unsteady Lubrication

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