转向辊升速过程带钢打滑行为力学建模及应用

Mechanical modling and application of strip′s sliding during the acceleration stage of steering roll

针对生产实际发生打滑问题,结合现场实际条件,建立连退活套转向辊升速过程中与转向辊接触段带钢的运动及力学模型,推导建立判断带钢发生打滑与否的模型,分析了升速过程中带钢打滑的力学原理,指出了在升速过程中带钢不仅可以由于粗糙度下降引起打滑,而且可以在摩擦因数足够的情况下由于前后张力波动也引起打滑,并分析了前后张力的波动对与转向辊接触段带钢的摩擦力、支持力、加速度的影响,在此基础之上,指出了张力波动控制优化的目标值,并应用于现场,避免了打滑事故的再次发生。

In response to the slipping problems in actual production,combining with the actual conditions,the kinematics model and mechanics model are built for the strip which contacts with the the steering roll in the looper of continuous annealing line during its acceleration stage,and the model to judge whether the strip sliding occurs is established.The mechnical principle of strip＇s sliding during acceleration stage is analyzed.It is pointed out that in the process of acceleration,the strip＇s sliding is not only caused by the decline of roughness,but also by the fluctuation of the forward and backward tensions in the case of enough friction coefficient.And the influence of the fluctuation of the forward and backward tensions on the friction force,the supporting force and the acceleration of the strip which s with the the steering roll is discussed.Then on this base,the optimization target value of the tension fluctuation is concluded,which is applied in field production to avoid the slipping accident occurred again.