Inducement analysis of nonlinear vibration in rolling mill hydraulic screw down system
ZHANG Yong-shun1,2, JIANG Wan-lu1, LI Zhen-bao1, LI Jing-jing1
1. Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control, Yanshan University, Qinhuangdao 066004, Hebei, China; 2. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, Hebei, China
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.
张永顺, 姜万录, 李振宝, 李静静. 轧机液压压下系统非线性振动诱因分析[J]. 钢铁, 2020, 55(4): 106-112.
ZHANG Yong-shun, JIANG Wan-lu, LI Zhen-bao, LI Jing-jing. Inducement analysis of nonlinear vibration in rolling mill hydraulic screw down system. Iron and Steel, 2020, 55(4): 106-112.
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