粗轧机主传动扭振分析

Torsional Vibration Analysis of Rougher Main Driving System of Rolling Mills

分析了粗轧机主传动扭振模型及动态特性计算方法。在分析过程中考虑到轧辊与主传动动力侧之间的周向间隙对扭振响应幅度的影响,根据咬钢过程中间隙的启闭规律,基于龙格-库塔方法实现了扭振响应的数值仿真。对宝钢2050轧机R2主传动各工况进行了数值仿真,结果表明：当咬钢瞬间板坯速度大于轧辊圆周线速度水平分量时,轧辊与系统动力侧之间的接轴间隙打开,相对于间隙常闭工况,上下分支主轴的扭矩放大系数都有所增大,增幅达4%-20%。

The analytic model and dynamic response solution for torsional vibration of main driving system on rougher of rolling mill were studied. The circumferential backlash between the roll and the driving side of the main driving system, which can enlarge the amplitude of the displacement owing to torsional vibration was considered in analysis. According to the rule of backlash opening and closing during biting, a new numeric method based on an advanced 4-order Runge-Kutta algorithm was put forward and used to simulate dynamic response to torsional vibration of the main driving system. The computer simulation of torsional vibration of main driving system of R2 rougher for Baosteel 2 050 mm hot rolling mill was carried out. The result of simulation shows that the backlash is open if velocity of the blank exceeds the horizontal component of circular velocity of the roll and torque amplification factors is increased by 4-20 percent, when the backlash is closed.