Research on Hydraulic Screw down-Vertical Vibration Characteristics of Strip Rolling Mill

doi:10.12068/j.issn.1005-3026.2022.07.009

Abstract

Abstract: Considering the effect of the vertical vibration of the strip mill on the non-linear flow rate of the four-way servo solenoid valve in the hydraulic system， the asymmetric segmented spring force of the hydraulic screw down cylinder under the non-linear flow rate change is derived. The dynamic equations of hydraulic screw down-vertical coupling vibration of the strip mill are established. The averaging method is used to solve the amplitude-frequency response equation of the coupled vibration system of the rolling mill， and the bifurcation characteristics of the rolling mill in the dynamic rolling process are solved using the singularity theory. Four different transition sets and their corresponding bifurcation diagrams are obtained. The effect of the unfolding parameters on the bifurcation characteristics of the rolling mill are analyzed. Finally， based on the actual rolling mill parameters， it is found through simulation that the amplitude-frequency curve of the system has turning characteristics at the section. Adjusting the response time of the servo valve can reduce the unstable frequency area of the coupling system. By adjusting the external excitation amplitude and damping ratio and other parameters， the resonance of the coupled system can be effectively improved. This can provide a theoretical reference for further suppressing the vibration of the roll system of the rolling mill.

Key words: hydraulic screw down-vertical vibration; strip rolling mill; non-linear flow rate; asymmetrical segmented spring force; bifurcation

CLC Number:

TH113.1

HOU Dong-xiao， FANG Cheng， CHEN Shan-ping， YAN Shuang. Research on Hydraulic Screw down-Vertical Vibration Characteristics of Strip Rolling Mill[J]. Journal of Northeastern University(Natural Science), 2022, 43(7): 972-980.

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