| Storsional self-excited vibration of rolling mill |
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| 作者姓名： | 唐华平 严珩志 钟掘 |
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| 作者单位： | CollegeofMechanicalandElectronicalEngineering,CentralSouthUniversity,Changsha410083,China |
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| 摘 要： | 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 tl, torsional vibration wave pattern gradually transforms from serration into sinusoid, and frictional self-excited vibration can cover all frequency components which are lower than that of free vibration; 2) stick time tl is directly proportional to torque increment AMR, 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 sliv time is a constant, it easily arouses strip surface shear impact and surface streaks.
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| 关 键 词： | 轧钢机 自激振动 质量控制 动态特性 |
Storsional self-excited vibration of rolling mill |
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| 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 t 1,torsional vibration wave pattern gradually transforms from serration into sinusoid,and frictional self-excited vibration can cover all frequency components which are lower than that of free vibration;2) stick time t 1 is directly proportional to torque increment Δ MR ,and is inversely proportional to live shaft stiffness K and drive shaft rotational velocity ω ;3) when slip time t 2 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. |
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| Keywords: | rolling mill drive self-excited vibration |
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