扁坯窄面鼓肚变形的分析和避免措施

Analysis of Deformation of Narrow Surface Bulging and Avoiding Measures

扁坯由于厚度较薄,理论上一般不会出现窄面鼓肚的问题,但是实际生产中这种情况时有发生。本文通过研究分析,发现当铸坯宽面夹持辊间距过大引起铸坯鼓肚后,鼓肚的铸坯通过下一对宽面夹持辊时,由于坯壳角部的扭转变形会造成铸坯窄面出现明显的鼓肚。高碳钢连铸过程中,当二次冷却比水量不合适时,也有可能导致铸坯的窄面鼓肚,同时产生三角区、中间裂纹。通过分析两个钢厂出现的问题,给出了相应的解决方法,可以为同类连铸机的设计、维护起到一定的参考作用。

Because the thickness of flat bloom is thin. In theory, there is no problem of narrow-face bulging. But in real production this happens all the time. Through the research and analysis, it is found that when the spacing between the wide surface clamping roller is too large, A bulge will appear. When the casting billet of the drum is passed through the next pair of wide-face clamping rolls, due to the torsion deformation of the blank shell, it can cause obvious bulge in narrow side. When the high carbon steel is casting, if the secondary cooling ratio is not timely, it is possible to cause the bulging in narrow surface of the flat bloom and produce the middle crack in the triangle area. By analyzing the problems of two steel mills,the corresponding solutions are given, which can serve as a reference for the design and maintenance of similar continuous casting machines.