轧机液压压下系统非线性振动诱因分析

doi:10.13228/j.boyuan.issn0449-749x.20190371

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Abstract The rolling mill with the hydraulic screw-down system is widely used in the strip production process, in order to solve the nonlinear vibration problem of rolling mill hydraulic screw-down system, the influence of three system parameters which are different damping coefficients, leakage coefficients and controller proportional coefficients on vertical vibration of the hydraulic screw-down system is studied under closed-loop control. Firstly, a vertical vibration model of the hydraulic screw-down system for the rolling mill is established considering the nonlinear spring force of the press cylinder. Secondly, the correlation between different system parameters and vertical vibration is analyzed by a vibration displacement-time diagram and a displacement-velocity phase diagram. Simulation results show that due to the hydraulic screw-down system of rolling mill adopts the traditional PID controller, the damping coefficient and leakage coefficient of the hydraulic system have slow time-varying characteristics, which may lead to the failure of the original PID control and cause vertical vibration of the system eventually. This research has a certain theoretical and practical engineering significance for the subsequent design of controllers to eliminate the vertical vibration caused by the fluctuation of hydraulic system parameters.

Key words： hydraulic screw down system nonlinear spring force vertical vibration nonlinear vibration model

Received: 07 August 2019

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	Articles by authors
	ZHANG Yong-shun
	JIANG Wan-lu
	LI Zhen-bao
	LI Jing-jing

Cite this article:

ZHANG Yong-shun,JIANG Wan-lu,LI Zhen-bao等. Inducement analysis of nonlinear vibration in rolling mill hydraulic screw down system[J]. Iron and Steel, 2020, 55(4): 106-112.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190371 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I4/106

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