热轧薄板等间距纵向条纹产生机制及控制策略

 热轧过程引入的带钢表面等间距纵向条纹缺陷，经后工序酸洗、冷轧、连续退火等处理均无法彻底消除，严重影响成品表面质量。通过全流程缺陷演变研究及工艺试验，确认了该缺陷是由热轧精轧末机架工作辊辊面磨削螺旋纹在轧制过程中转印至带钢表面所致。磨削过程中砂轮平面与轧辊辊面曲线的接触匹配不当、磨辊工艺参数不合适等因素会导致磨削螺旋纹的产生。通过优化精轧工作辊CVC辊形及轧辊磨削参数，彻底消除了轧辊表面磨削螺旋纹以及由此导致的热轧薄板表面等间距纵向条纹缺陷。

Generation mechanism and control strategy of equally-spaced longitudinal stripes on the surface of hot-rolled plate

Equally- spaced longitudinal stripes introduced in hot rolling process couldn’t be completely eliminated after pickling，cold rolling and continuous annealing，which seriously affect the quality of finished product. Defect evolution research during the whole process and technological experiment have been carried out，which confirmed that the translations of grinding spiral lines，closely related to the roll grinding process and CVC roll profile curvature，from the finishing work roll surface in last pass to the steel strip surface，was the main cause. Grinding spiral lines on roll surface and the resulting equally- spaced longitudinal strips in hot- rolled sheet surface were caused by the mismatch of grinding wheel surface and the roll surface curve，and could be completely eliminated by optimizing CVC profile of finishing work roll and roll grinding parameters.