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Research on strip hysteretic behavior and mill vertical vibration system nonlinear dynamics

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Abstract

Rolling mill vibration is a technical problem in the iron and steel industry for many years and has serious impact and harm on production. There were serious vibrations in the middle mills when rolling thin container strip for the compact strip production (CSP) strip hot rolling process. This paper studied the hysteretic characteristic of rolled strip and established the vertical vibration system single-degree-of-freedom dynamics model of the F3 mill rollers. The influence of parameters on the system characteristics was studied, such as the linear damping coefficient, linear stiffness coefficient, nonlinear displacement coefficient, nonlinear velocity coefficient and exciting force, and then, the vibration source and vibration-restraining measure were studied from the roll gap. The results show that with increasing linear stiffness, damping and hysteresis coefficient, it can reduce the possibility of chaotic system; the linear stiffness coefficient had the greatest influence, and hysteresis damping coefficient had minimal influence on chaotic threshold. In order to reduce rolling mill vibration amplitude, we should reduce the external excitation force firstly, and in order to improve the dynamic performance of the system, we should control the speed of nonlinear coefficient values. The contrast experiments were carried out at the production scene finally.

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Acknowledgments

This research was supported by Key Scientific Research Project of Henan Province (No. 17A580003), Henan Polytechnic University Education Teaching Reform Research Projects (No. 2015JG034) and Colleges and Universities Focus on Soft Science Research Project Plan (No. 16A630049).

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Correspondence to Xiaobin Fan.

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Fan, X., Zang, Y. & Jin, K. Research on strip hysteretic behavior and mill vertical vibration system nonlinear dynamics. Appl. Phys. A 122, 877 (2016). https://doi.org/10.1007/s00339-016-0410-3

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