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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Storsional self-excited vibration
of rolling mill
TANG Hua-ping(唐华平), YAN Heng-zhi(严珩志), ZHONG Jue(钟  掘)

College of Mechanical and Electronical Engineering,
Central South University, Changsha 410083, China

Abstract:The roller's torsional self-excited vibration caused by roller stick-slip, and its influence on strip surface quality have been studied. Based on analysis of roller working surface stickslip, roller rotation dynamics equations have been established. The nonlinear sliding-frictional resistance has been linearized, and dynamics equations have been solved according to the characteristics of stick and slip between roller and strip. The results show that: 1) with decreasing stick time t1, torsional vibration wave pattern gradually transforms from serration into sinusoid, and frictional self-excited vibration can coverall frequency components which are lower than that of free vibration; 2) stick time t1 is directly proportional to torque increment ΔMR, and is inversely proportional to live shaft stiffness K and drive shaft rotational velocity ω; 3) when slip time t2 is basically steady, the longer the stick time, the larger the energy that system absorbs and discharges. As the slip time is a constant, it easily arouses strip surface shear impact and surface streaks.

 

Key words: rolling mill; drive; self-excited vibration

ISSN 1672-7029
CN 43-1423/U

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