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    杨泊莘, 许浩杰, 安琦. 立轧塑性变形的力学分析及边缘裂纹研究[J]. 华东理工大学学报(自然科学版), 2023, 49(4): 606-614. DOI: 10.14135/j.cnki.1006-3080.20220314002
    引用本文: 杨泊莘, 许浩杰, 安琦. 立轧塑性变形的力学分析及边缘裂纹研究[J]. 华东理工大学学报(自然科学版), 2023, 49(4): 606-614. DOI: 10.14135/j.cnki.1006-3080.20220314002
    YANG Boxin, XU Haojie, AN Qi. Mechanical Analysis of Plastic Deformation and Research on Edge Crack in Vertical Rolling Process[J]. Journal of East China University of Science and Technology, 2023, 49(4): 606-614. DOI: 10.14135/j.cnki.1006-3080.20220314002
    Citation: YANG Boxin, XU Haojie, AN Qi. Mechanical Analysis of Plastic Deformation and Research on Edge Crack in Vertical Rolling Process[J]. Journal of East China University of Science and Technology, 2023, 49(4): 606-614. DOI: 10.14135/j.cnki.1006-3080.20220314002

    立轧塑性变形的力学分析及边缘裂纹研究

    Mechanical Analysis of Plastic Deformation and Research on Edge Crack in Vertical Rolling Process

    • 摘要: 钢坯边缘开裂是轧制工艺中的一个重要难题。建立了一种在立轧阶段对钢坯边缘裂纹扩展与闭合进行判断的能量分析模型,根据所提出的Γ-三次曲线函数狗骨模型,推导了对应的塑性流动速度场、应变速率场以及包含裂纹尺寸参数的总功率泛函表达式。基于功率最小化原理,数值求解了狗骨变形参数和轧制力,实现了对临界开裂点的计算。结合具体算例对所建立的计算方法进行了验证,并进一步研究了裂纹尺寸对立轧工艺参数和钢坯力学性能的影响。结果表明,开裂与钢坯边缘的变形程度有关,在压下量大小一定的前提下,增大立辊半径可以起到抑制边缘开裂、提高裂纹闭合率的作用。

       

      Abstract: The cracks appearance on slab edge is a significant quality problem faced in the rolling process. In this paper, an energy analytic model to evaluate the growth and closure of edge crack in vertical rolling process is established. According to the proposed Γ-cubic function dog-bone model, the corresponding expressions of plastic flow velocity field, strain rate field, as well as total power functional with crack size parameters are obtained. The calculation of critical crack point is achieved after dog-bone deformation parameters and rolling force are solved numerically by using the principle of minimum energy. Then, the established calculation method is verified by specific examples. Furthermore, the effects of crack size on rolling parameters and mechanical properties are studied. The results show that the growth of crack is related to the deformation degree of the slab edge. For the premise of width reduction requirement, increasing the radius of vertical rollers is an advantage to control the edge crack and improve the crack closure rate. This paper provides an insight into ensuring product quality and the optimization of rolling process.

       

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