孔型对H型钢开坯轧制成形的影响及优化

采用弹塑性有限元方法,依托ABAQUS软件中显式计算的方法,对不同规格H型钢的往复开坯轧制进行仿真分析。应用ALE网格自适应技术解决了多道次的网格畸变问题。引入现场测试的温度数据作为模型的温度边界条件。通过对不同规格H型钢使用相同坯料的轧制过程进行模拟分析发现,孔型对开坯轧制最终成形有较大影响。分析结果表明,当采用展宽孔型轧制大规格型钢时,最终道次稳定段的轧件断面不能充满孔型,造成翼缘内侧缺肉现象;采用箱型孔预轧制小规格型钢时,这一现象则不是很明显。采用实测尺寸对H700×300规格H型钢的断面尺寸进行了对比验证。针对上述缺陷对H700×300规格的H型钢粗轧孔型进行优化,改善了翼缘缺肉现象。研究结果对于制定BD轧制规程具有指导意义。

Effects of groove on deformation in break-down rolling of H-beam and optimization

Reversing break-down rolling processes of different sizes of H-beam were simulated by ABAQUS software using explicit method in this paper.The technology of mesh adaptation(ALE) was used to solve the problem of mesh distortion in multi-pass rolling.The simulation model was more accurate by introducing the measurement data of temperature.The results indicated that the groove obviously affected the final cross-section of break-down rolling.When broadening groove was used to roll large size H-beam,the cross-section of rolled pieces in last pass didn't match the groove,which caused the incomplete flange.When box groove was used to roll small size H-beam,the cross-section of rolled pieces in last pass almost matched the groove.The cross-section dimension of H700×300 was verified by the measurement data.According to the above phenomena,the groove of large size H-beam has been optimized to improve the incompleteness of flange.Results of this study could provide guidance for designing rolling schedule of BD.