基于“应变重构”的热轧带钢C翘缺陷调控研究

Research on control of C-warp defect of hot rolled strip based on"strain reconstruction"

由残余应力不平衡所导致的C翘缺陷是热轧带钢生产过程中难以回避的板形问题,但实际生产中缺乏有效的调控手段。采用基于弹性断裂力学原理的裂纹柔度法,研究了平整加工过程残余应力的演变规律,提出了基于加工过程金属流动性特征的"应变重构"方法,高效、便捷地改善了热轧带钢的平直度缺陷及应力问题。应用上述原理,分析了热轧生产中普遍存在的C翘缺陷的改善机制,并给出了现场应用案例。

C-warp defect caused by residual stress imbalance is an unavoidable shape defect in the production of hot rolled strip,but there is a lack of technical means to control C-warp in actual production.In this paper,the crack compliance method based on the principle of elastic fracture mechanics was used to study the evolution of residual stress in the process of tempering process,and"strain reconstruction"method based on the flow characteristics of metal in the process was proposed to improve the flatness defects and stress problems of hot rolled strip efficiently and conveniently.Based on the above principles,the improvement mechanism of C-warp defect in hot rolling production was analyzed,and the application case was given.