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熱帶鋼軋機板形綜合控制技術開發

Development of integrated shape control technologies in hot strip mills

  • 摘要: 為了改善熱帶鋼軋機的板形控制性能、提高產品的板形質量、降低生產消耗,針對工作輥可軸向竄動的熱帶鋼軋機,在大量有限元模擬基礎上開發了特殊的工作輥輥形技術和支持輥輥形技術及相應的板形控制模型,包括過程控制系統(L2級)的板形設定控制模型和基礎自動化系統(L1級)的彎輥力前饋控制模型、凸度反饋控制模型及平坦度反饋控制模型.在經歷離線模型建立、在線編程和調試等諸多復雜過程后,輥形技術及板形控制模型在工業寬帶鋼熱軋機上進行了長期、穩定的應用.生產實踐表明,采用這些板形控制技術后,凸度偏差控制在±18μm的比例超過93%,平坦度偏差控制在±25IU的比例超過94%,同時實現了自由規程軋制.

     

    Abstract: 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.

     

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