CSP热连轧机振动问题

某CSP精轧机组F3轧机在轧制薄规格集装箱板时发生了强烈的振动，为确定其性质并寻求抑制措施，首先对其主传动系统和机座系统的固有特性进行了计算，然后对F3轧机的主传动系统转矩、接轴弯矩、工作辊的振动等进行了现场测试，最后建立了F3轧机振动的速度图谱。结果发现，F3有轻微扭振，其主要振动形式为辊系水平(轧制方向)和垂直振动，且水平方向上的能量远大于垂直方向上的，二者主要频率均为51 Hz，它们是由接手轴弧形齿啮合冲击激发辊系水平方向上第三阶共振和轧机机座垂振系统第一阶共振引起的。据此，提出了及时更换接轴弧形齿及在工作辊轴承座和衬板间添加铜垫片以消除轴承座和牌坊间间隙的简易措施，从而起到抑制辊系水平方向上振动的作用，该措施已在某钢厂应用。

VIBRATION PROBLEMS OF CSP HOT TANDEM MILL

The F_3 stand in a certain CSP hot tandem mill ap- pears strong vibration when thin container strips are rolled.In order to determine its nature and seek measures to restrain the vibration,firstly the F_3 internal characteristics of main drive system and stand are calculated,then the main drive system torque,the spindle bending torque and the rollers'vibration are field tested,lastly the F_3 speed spectrum is established.It is found that F_3 has weak torsional vibration.The main vibrating energy is concentrated in horizontal(along rolling direction) and vertical direction.And the former is far greater than the latter,but their frequency are both 51 Hz.They are caused by the third order sympathetic vibration of transverse system and first order sympathetic vibration of vertical system excitated by the meshing impact of curved gear coupling.Hereby the corre- sponding measures such as changing curved tooth duly are put forward.In order to eliminate the clearance between work roller's bearing chock and scaleboard the sheet copper is filled up into the gap.This simple measure is helpful to restrain F_3 horizontal vibration and has been employed in some factory.