带钢热连轧非对称因素对板形的影响

Influence of asymmetric factors in hot tandem rolling on the shape of steel strips

为研究某2250 mm热连轧生产中非对称因素对轧件非对称板形(如楔形和单边浪)的影响,利用基于影响函数法的辊系变形模型、张应力模型和简化的轧制压力横向分布模型相结合的方法,建立了集轧机和轧件为一体的非对称板形计算模型.研究结果表明:来料楔形对轧件楔形的影响明显超过其对轧件平坦度的影响;上游机架和下游机架刚度非对称分别主要影响轧件楔形和平坦度;40℃以内的轧件温度不对称分布对轧件平坦度影响较小,对出口楔形的影响可以忽略;轧件跑偏对楔形和平坦度均有显著影响.根据板形良好条件确定了各非对称参数的允许范围.

In order to analyze the influence of asymmetric factors on the shape（ such as wedge and single edge wave） of rolled pieces in 2250 mm hot tandem rolling,an asymmetric shape calculation model involving rolls and rolled pieces was established,which is integrated by a roll deformation calculation model based on the influence function method,a transverse distribution model of tension stress and a simplified transversal distribution model of rolling force. The results show that the wedge of incoming pieces has a greater effect on the wedge of rolled pieces than on the flatness. The stiffness asymmetry of up-stream stands and down-stream stands mainly affect the wedge and flatness of rolled pieces,respectively. A temperature difference of rolled pieces within 40 ℃ has a little effect on the flatness and has negligible effect on the wedge. The deviation of rolled pieces affects both the wedge and flatness dramatically. The admissible ranges of asymmetric factors were determined with a target of achieving a good strip shape.