冷轧基板起筋成因分析及控制实践

针对1 450、2 032 mm热连轧线生产的冷轧基板在下游工序出现的批量起筋缺陷,结合两条热轧线的装备控制特点,从板形控制、轧制工艺规范管控的变化对其产生原因和机理进行分析,得出热轧带钢凸度控制失稳是导致起筋的重要原因。通过进行HVC板形控制模型的优化及生产工艺管理制度的调整,实现轧制过程的“均匀变形、板凸度一致”控制,保证带钢断面质量及凸度命中效果,冷轧产品起筋缺陷发生率同比下降95.12%,产品质量得到明显改善。

Cause analysis and control practice of ridge #br# buckle of cold rolling substrate

 In view of the batch ridge buckle defect appearing in the downstream process for the cold rolling substrate produced by the 1 450 and 2 032 mm hot rolling line, combined with the characteristics of equipment control of two hot rolling production lines, the causes and mechanism of the defects were analyzed from the change of shape control and rolling process specification control. And the results showed that the instability of crown control of hot rolling strip was an important reason for the ridge buckle. By optimizing the control model of HVC profile and adjusting the production process management system, the control principle of "uniform deformation and uniform crown" for the rolling process was realized, the cross section quality of the strip and crown control was ensured, the occurrence rate of ridge buckle of cold rolled products was reduced by 95.12% compared with the same period of the last cycle, and the product quality was obviously improved.