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Forced transverse vibration of rolls for four-high rolling mill

Journal of Central South University 2009年第6期16卷 954-960页

作者：孙建亮彭艳刘宏民江光彪 State Key Laboratory of Metastable Materials Science and Technology Yanshan University Engineering Research Center of Rolling Equipment and Complete Technology of Ministry of Education Yanshan University Hot Rolling mill of Baoshan Iron and Steel Co Ltd

In order to investigate the forced transverse vibration of rolls under distributed draught pressure and moment of bending roll force, the forced transverse vibration model of rolls for four-high rolling mill was established. The work roll and backup roll were considered as elastic continuous bodies that were joined by a Winkler elastic layer. According to Euler-Bemoulli beam theory, the forced transverse vibration of rolls was analyzed based on modal superposition method. The forced vibration equations were established when the draught pressure and moment of bending roll force were imposed on the rolls respectively. Numerical modeling was made on 2 030 mm cold tandem rolling mill of Baoshan Iron and Steel Company. Simulation results show that when the work roll is only subjected to different forms of draught pressures, the vibration curves of work roll and backup roll are quadratic curves with amplitudes of 0.3 mm and 45 μm, respectively. When only the moments of bending roll force are imposed on the work roll and backup roll, the vibration curves of work roll and backup roll are quadratic curves, and the amplitudes are 5.0 and 1.6 μm, respectively. The influence of moment of bending roll force on the vibration of work roll is related with the bending roll force.

关键词： four-high mill forced transverse vibration rolls modal superposition method

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Effect of Load Distribution on Strip Crown in Hot Strip Rolling

引用

Journal of Materials Science & Technology 2004年第3期20卷 330-334页

作者： HongshuangDI JianzhongXU DianyaoGONG XianghuaLIU GuodongWANG XiaomingHE LiyingBA StateKeyLaboratoryofRollingandAutomation NortheasternUniversityP.O.Box105Shenyang110004China HotStripRollingGroupofBAOSTEEL Shanghai201900China

In order to establish precision model, a software to calculate the strip crown of four-high hot rolling mill was developedby using affecting function method according to the strip crown calculation theory. The effect of work roll diameter,unit width rolling load, roll bending force, work roll crown, initial strip crown and reduction, etc, on load distributioneffect rate was simulated by using the software. The results show that the load distribution effect rate increaseswith the increase of strip width, work roll diameter, unit width rolling load, roll bending force, work roll crown,initial strip crown and reduction. Based on the simulation results, base value of load distribution effect rate andfitting coefficients of six power polynomial of load distribution effect rate modification coefficient were determinedconsidering all of the above parameters. A simplified mathematical model for calculating load distribution effect ratewas established.

关键词： Hot strip rolling four-high mill Affecting function Load distributionv Crown control

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