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短行程控制是粗轧中间坯调宽过程中改善轧件头尾部形状、降低切损量的有效方法,而目前采用较多的折线式短行程控制模型还有待进一步提高。结合热带钢粗轧机组实际工艺条件,采用刚塑性有限元法建立立辊/水平辊连轧过程热力耦合数值计算模型,对粗轧过程头尾部非稳态变形分布进行深入分析,得出中间坯头尾部立辊/水平辊轧制失宽变化规律。基于数值计算结果提出5次多项式短行程控制策略,并建立相应多项式短行程控制模型。通过对比计算结果表明,新建的多项式短行程控制模型具有更好的头尾形状控制能力,提高了热带钢产品成材率。
Short stroke control is an effective way to improve the head and tail shape of the rolling stock and reduce the cutting loss during the process of widening the width of the roughing intermediate billet. However, more short-stroke control models with short stroke still need to be further improved. Based on the actual technological conditions of the roughing mill of the hot strip mill, a rigid-plastic finite element method was used to establish the numerical model for the thermal coupling of the vertical roll and the horizontal roll. The unsteady deformation distribution of the head and the tail of the rough rolling process was analyzed. Head and tail vertical roll / horizontal roll rolling loss of variation. Based on the numerical calculation results, the polynomial short stroke control strategy is proposed and the corresponding polynomial short stroke control model is established. The results of comparison show that the new polynomial short-stroke control model has better head and tail shape control ability and improves the yield of tropical steel products.