工艺参数对热轧机振动固有特性影响分析

doi:10.13228/j.boyuan.issn0449-749x.20200474

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Abstract The vibration problem of rolling mill is the main cause of strip thickness difference,surface scratch or vibration pattern. In addition,vibration can cause fatigue damage of equipment parts,and even cause instability vibration due to process reasons,which will endanger the production safety of the system. It is very important to master and understand the natural frequency and vibration characteristics of rolling mill system,which is the basic condition of vibration analysis. Strong vibration occurred on F2 stand of hot continuous rolling line in a steel plant when rolling thin products. In order to better identify the type of mill vibration and suppress the mill vibration,it is necessary to conduct a comprehensive analysis on the natural modal characteristics of the rolling mill system. Considering the vibration of horizontal,torsional and vertical system,and considering the coupling effect of strip and rolling mill system,an 11 degree of freedom vibration model of hot rolling mill is established. The natural modal characteristics of the rolling mill system without strip steel are analyzed,and the sensitivity of inertia parameters and elastic parameters to the natural modal characteristics of the rolling mill system is analyzed. At the same time,the influence of process parameters,such as front and back tension,inlet thickness,exit thickness,friction coefficient and deformation resistance on the natural characteristics of the rolling mill system is analyzed. The results show that the strip and rolling mill are coupled to form a variable structure system. The natural characteristics of the system vary with different process parameters. The process parameters mainly affect the natural characteristics of the system by changing the 4th and 10th modes. The influence of different process parameters on the natural characteristics of rolling mill system is different,and the influence of inlet thickness is the most significant. The system natural frequency can be improved by changing process parameters. The guidance for the identification of rolling mill vibration types and vibration suppression was provided.

Key words： hot rolling mill modal analysis sensitivity process condition strip steel

Received: 15 September 2020

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	HUANG Jin-lei
	ZANG Yong
	GAO Zhi-ying

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HUANG Jin-lei,ZANG Yong,GAO Zhi-ying. Influence of process parameters on vibration natural characteristics of hot rolling mill[J]. Iron and Steel, 2021, 56(2): 93-98.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200474 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I2/93

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