为了优化液芯压下工艺参数,达到改善铸坯中心处偏析和疏松的目的.基于有限元法,以结晶器出口处薄板坯横截面的温度为初始条件,利用Marc软件模拟计算了薄板坯三维热-力耦合模型带液芯压下过程,分析了压下量分配对铸坯各节点应力和应变的影响.研究结果表明,总压下量相同时,均匀的压下量有利于降低铸坯表面的应力,而局部大压下更有利于改善铸坯的中心质量.
In order to improve the slab center segregation and porosity,the parameters of liquid core reduction process were optimized.Based on the finite element theory,the software Marc was used to compute the three-dimensional thermal-mechanical coupling model of thin slab during the liquid core reduction process,and the temperature of the slab cross section in the mold exit was considered as the initial conditions.The effects of different reduction distribution on nodes'stresses and strains in slab were analyzed.The result showed that the slab surface stress would be decreased by adopting evenly reduction distribution with constent overall reduction and the bigger reduction can be more helpful for improving the central quality.
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