连铸坯倒角对粗轧宽展的影响及宽度模型改进

doi:10.13228/j.boyuan.issn0449-749x.20170591

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摘要带倒角的结晶器能够改善连铸板坯角部在矫直段的高温延展性，显著减少角横裂的发生。然而，连铸坯的倒角对粗轧过程宽展量有很大影响。通过建立粗轧过程板坯形变的有限元仿真模型，系统研究了轧制过程中板坯倒角尺寸和形状对轧件宽展量的影响。结果表明，连铸坯倒角边长越大，相同的立辊侧压量下所产生的狗骨回展量越小，同时在水平轧制时所产生的自然宽展也越小，而倒角角度的变化对粗轧宽展的影响不显著。针对现有的宽展公式没有考虑轧件存在倒角的问题，给出了一个含有倒角参数的修正项公式。通过与现场实测数据和原宽度模型计算结果对比，对于带倒角的连铸坯轧制情况，修正后的宽展模型预报精度显著提高。

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	苏岚

关键词 ：连铸坯倒角 , 有限元模型, 宽展模型, 粗轧

Abstract：The mould with chamfered corner can improve high temperature ductility at continuous casting slab corner in straightening section，and significantly reduce the occurrence of transverse crack. However，the chamfering of the continuous casting slab has a significant effect on the spread during rough rolling. The slab deformation finite element model of rough rolling process was used to study the influence of chamfering side length and shape on the spread during rough rolling. The results show that the larger the chamfering side length，the dog bone spread is smaller produced by the same width reduction，and the natural spread is smaller produced by the horizontal rolling. The chamfering angle had no significant effect on the spread. A modified formula with chamfering parameters was presented. The accuracy of the modified spread prediction model is improved obviously for the continuous casting slab with chamfered corners on base of the comparison with the measured value and the calculated value using the new original spread model.

收稿日期: 2017-12-08 出版日期: 2018-06-20

PACS:

TG335

引用本文:

苏岚，宋勇，郑永刚，高志刚. 连铸坯倒角对粗轧宽展的影响及宽度模型改进[J]. , 2018, 53(6): 70-75. SU Lan，SONG Yong，ZHENG Yong-gang，GAO Zhi-gang. Influence of slab chamfer on spread and improvement of width control model in rough rolling. Iron and Steel, 2018, 53(6): 70-75.

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