板坯连铸铸坯二冷顶弯段应力分析

Simulation of Stress on Bending Bow of Slab Caster

以某钢厂2号板坯连铸机结晶器至二冷顶弯段末的铸坯为研究对象,采用切片法建立沿拉坯方向上铸坯的二维纵断面弹塑性应力分析模型,并结合有限元数值模拟技术,对Q235G钢连铸坯的连铸过程进行数值仿真,获得顶弯过程中铸坯内的应力变化规律.结果表明,在夹棍位置下,铸坯内部20mm处受到的等效应力随距弯月面距离的增加逐渐增大;铸坯表面受到的等效应力先增大,然后在10.25MPa上下波动,在顶弯段末,等效应力开始回落.此外,外弧侧凝固坯壳受到的等效应力大于内弧侧坯壳的等效应力.模拟所得计算结果可为研究2号铸机顶弯段结构对铸坯质量的影响提供理论依据.

The No.2 slab caster of certain steel plant, which was from mold to the end of secondary cooling bending bow, was regarded as study target. The planar elastic-plastic stress analysis model along rolling direction was built by microtomy, and united with finite element numerical simulation technology to simulate the continuous casting process of Q235G slab, and then the stress change law of slab during bending process obtained. The results showed that under the rollers, the equivalent stress of subcutaneous 20 mm increased with increasing the distance to meniscus. On the slab surface, the equivalent stress firstly increased, and then fluctuated around 10.25 MPa, at the end of bending bow, the equivalent stress began to decline. In addition, the equivalent stress of solidified shell in out arc was greater than inner arc. The results presented reference to understand the structural influence of No.2 slab caster bending bow on the slab quality.