基于二冷均匀冷却的方坯连铸机二冷喷淋结构

某厂180 mm方坯连铸机生产的铸坯存在较为严重的角部皮下裂纹问题。通过对铸机建模、数值仿真,得到铸坯凝固过程中的表面中心、角部温度等数据。基于二冷均匀冷却原则,对铸坯二冷喷淋结构进行数值仿真评估与优化,包括铸坯在纵向以及周向上的冷却均匀性分析。依据分析结果提出喷淋结构改造方案,对铸机第10流二冷喷淋结构进行实际改造,进行生产试验。对比未改造(其他流)与改造后(10流)生产的铸坯低倍形貌发现,10流生产的铸坯角部皮下裂纹得到明显改善。

Research on secondary cooling spray structure of billet continuous casting machine based on uniform cooling

The billet produced by the 180 mm billet continuous caster in a certain factory has serious corner subcutaneous cracks. Through modeling and numerical simulation of the casting machine, the surface center and corner temperature of the casting slab solidification process are obtained. Based on the principle of uniform cooling of the secondary cooling, the simulation evaluation and optimization of the secondary cooling spray structure of the cast slab, including the cooling uniformity analysis of the cast slab in the longitudinal and circumferential directions. According to the optimized structure plan, the 10th stream and second cold spray structure of the casting machine was actually modified and the production test was carried out. Comparing the low-magnification morphology of cast slabs produced without modification (other streams) and after modification (10 streams), it is found that the subcutaneous cracks at the corners of the slab produced by 10 streams have been significantly improved.