热连轧机弯辊力优化设定策略研究及应用

针对传统热轧机板形设定模型仅根据带钢头部的要求来设定弯辊力而可能导致中尾部所需弯辊力超出设备能力极限的问题,提出一种弯辊力优化设定策略。该策略对带钢全长轧制过程进行考虑,根据最近一次同钢种同规格带钢轧制时实际轧制力与凸度的变化,预算本卷带钢全长板形控制所需要的弯辊力调节量,结合弯辊设备的能力极限,为带钢中尾部板形控制预留必要的弯辊力。在上海梅山钢铁股份有限公司热轧厂1780热连轧生产线上的实际应用效果表明,采用该策略后基本消除了带钢尾部中间轧破现象,大幅提高了热轧带钢中尾部轧制的稳定性。

Research and application of optimal strategy for setting bending force in hot strip mills

In view of the fact that the traditional model for setting hot rolling strip shape sets the bending force based on the strip head requirements alone and consequently the bending force needed by the strip middle and tail cannot be satisfied by the equipment in the full length rolling process, a new strategy for optimally setting the bending force in hot strip mills was proposed. It considers the full length rolling process and, according to the change of the actual convexity and rolling force in the latest rolling of strip of the same grade and specifications, predicts the amount of roll bending force adjustment required by full length shape control. In light of the bending limit of the rolling equipment, it reserves the needed roll bending force for the shape control of the strip middle and tail. Successfully applied to the 1780 mm hot strip mill in Meisteel, the new strategy is found to have basically eliminated the breaking phenomenon in the strip tail and greatly improved the hot rolling stability of the strip middle and tail.