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Theoretical and experimental study on the producible rolling thickness in ultra-thin strip rolling
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.jmatprotec.2019.116537
Xiao Liu , Hong Xiao

Abstract The cold rolling process of a thin strip is difficult to continue when the strip has been thinned to a certain thickness. A limit thickness, which is referred to as the limiting producible rolling thickness below which plastic deformation does not occur, exists even if the rolling force and the number of rolling passes are increased. The Stone formula is the most common approach for predicting this limit, but its results are inaccurate in experiments or in ultra-thin strip-rolling production. In this study, the variation laws of the contact profile and rolling pressure of ultra-thin strips with different thickness specifications at different reductions were obtained by finite element simulations, indicating that the Stone minimum thickness can be regarded as the critical thickness that exists when a neutral zone is present under a minimal reduction. A theoretical calculation model of producible rolling thickness for an ultra-thin strip based on Fleck theory was established and verified by experiments. When this model is used, the single-pass reduction can be obtained in accordance with the given unit width rolling force, the technical parameters of the rolling mill, the yield strength of the material, and the initial thickness of the strip. The formula for the conditional limiting producible thickness considering the restriction of rolling force was corrected. The relationship between single-pass reduction and the ratio of the initial thickness of the strip to the theoretical limiting producible thickness under the condition of the maximum allowable rolling force of the rolling mill was discussed. This study provides theoretical guidance for practical production by defining the product specification ranges and rolling regulations for existing rolling mills and determining the roller diameters and force and energy parameters for the design of rolling mills.

中文翻译:

超薄带材轧制可生产轧制厚度的理论与试验研究

摘要 当带钢减薄到一定厚度后,薄带钢的冷轧工艺难以继续。即使增加轧制力和轧制道次,也存在极限厚度,称为极限可生产轧制厚度,低于该极限厚度不会发生塑性变形。Stone 公式是预测该极限的最常用方法,但其结果在实验或超薄带钢轧制生产中不准确。本研究通过有限元模拟得到不同厚度规格的超薄带钢在不同压下量下的接触轮廓和轧制压力的变化规律,表明 Stone 最小厚度可以看作是在最小减薄下存在中性区时存在的临界厚度。建立了基于Fleck理论的超薄带钢可轧制厚度理论计算模型,并通过实验验证。使用该模型时,根据给定的单位宽度轧制力、轧机技术参数、材料屈服强度、带钢初始厚度,可得到单道次压下量。修正了考虑轧制力限制的条件限制可生产厚度公式。讨论了在轧机最大允许轧制力条件下单道次压下率与带钢初始厚度与理论极限可生产厚度之比的关系。本研究通过定义现有轧机的产品规格范围和轧制规定,确定轧机设计的轧辊直径和力和能量参数,为实际生产提供理论指导。
更新日期:2020-04-01
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