小规格H型钢粗轧扭转影响因素分析

Analysis of Influencing Factor of Torsion During Small-size H-beam Rough Rolling Process

针对小规格H型钢粗轧过程中轧件出现扭转变形问题,以某钢厂小H型钢粗轧工艺参数为参考,利用Marc/superform有限元软件对粗轧轧制阶段进行模拟,分析轧件产生扭转变形的原因以及工艺因素对轧件扭转变形的影响规律。结果表明:小型H型钢粗轧过程轧辊轴向错位或来料偏扭都会引起轧件的扭转;减小孔型侧壁斜度对抑制轧件扭转程度作用明显;扩大槽底圆角能够增大翼缘外端部与圆角处接触面积,对轧件扭转起到一定的限制作用。文中孔型系统下V2,V5压下量比值越大轧件扭转越严重,立轧道次压下量比值控制在1.1~1.5范围更有利于提升轧制稳定性。

Aiming at the problem of torsion deformation during the rough rolling of small H-beams,taking the rough rolling process parameters of small H-beam in a steel company as a reference,the Marc/superform finite element software was used to simulate the rough rolling stage,and to analyze causes of the torsional deformation of the rolled piece and the influence of technological factors on the torsional deformation of the rolled piece.The results show that the improper installation of the rolls or the skew of incoming will cause the torsion of the rolled pieces during the rough rolling of small H-beam.Reducing the side wall slope of the pass has a significant effect on restraining the twist of the rolled piece.Enlarging the fillet at the bottom of the groove can increase the contact area between flange and the fillet,which plays a certain role in limiting the torsion of the rolled piece.In this paper,the larger the reduction ratio of V2 and V5 in the pass system,the more serious the torsion of the rolled piece will be.Controlling the reduction ratio of the vertical pass within the range of 1.1-1.5 is more conducive to improving the rolling stability.