热带钢轧机板形综合控制技术开发

为了改善热带钢轧机的板形控制性能、提高产品的板形质量、降低生产消耗,针对工作辊可轴向窜动的热带钢轧机,在大量有限元模拟基础上开发了特殊的工作辊辊形技术和支持辊辊形技术及相应的板形控制模型,包括过程控制系统(L2级)的板形设定控制模型和基础自动化系统(L1级)的弯辊力前馈控制模型、凸度反馈控制模型及平坦度反馈控制模型.在经历离线模型建立、在线编程和调试等诸多复杂过程后,辊形技术及板形控制模型在工业宽带钢热轧机上进行了长期、稳定的应用.生产实践表明,采用这些板形控制技术后,凸度偏差控制在±18μm的比例超过93%,平坦度偏差控制在±25IU的比例超过94%,同时实现了自由规程轧制.

Development of integrated shape control technologies in hot strip mills

In order to improve the shape control performances of hot strip mills and the shape quality of strips and to reduce production consume, special contour technologies of work rolls and backup rolls were developed for this type of hot strip mills whose work rolls can shift axially, on the basis of large amount of finite element simulations. Relevant shape control models were also set up, including the shape setup control model in process control system (LEVEL 2), the bending force feedforward control model, the crown feedback control model and the flatness feedback control model in basic automation system (LEVEL 1). After several complicated processes such as setup of off-line models, on-line programming, and debugging were finished, roll contour technologies and shape control models were stably applied in an industrial wide strip hot rolling mill. The production data showed the control precisions of profile and flatness, with the crown deviation in the range of ±18μm and the flatness deviation less than ±25 IU, were over 93% and 94%, respectively. And at the meantime, schedule free rolling was realized.