3 500 mm产线薄宽规格桥梁板边浪原因分析与控制

针对某厂生产薄宽规格桥梁板在冷床冷却时出现边浪的问题,分析了其产生原因,即钢板在冷却过程中边部和中部温差较大,边部和中部收缩不一致产生不均匀变形而导致钢板边浪缺陷.在轧机无弯辊、轧辊轴向横移等先进板形控制手段,产线无冷矫直机和压平机对板形进行处理的条件下,通过调整压下负荷分配,末道次和末第2道次产生比例凸度差,使轧制钢...

Cause analysis and control of edge wave of thin-wide gauge bridge plate in 3 500 mm production line

Aimed at the edge wave defect of thin-wide gauge bridge plate in a factory,the causes of edge wave defects were analyzed.The results show that during the cooling process,the temperature difference between the sides and the middle of the plate is large,and the shrinkage discrepancy between the sides and the middle of the plate results in uneven deformation,which leads to the edge wave defect of the plate.Under the conditions of rolling mill without bending roll,roll axis shifting along horizontal direction and other advanced shape control measures,and no cold straightener and flattener in the production line,the rolled plate shape was contrlled to form a small medium wave by adjusting the load distribution under pressure,and the difference of proportional convexity between the last two passes.At the same time,through the optimization of laminar cooling manifold model and straightening process,the problem of thin gauge of bridge plate edge defects was effectively solved,the comprehensive qualified rate of shape of 6-12 mm gauge bridge plate was increased,and the production cost was reduced.