新型圆坯结晶器铜管结构模拟优化设计

为优化设计新型圆坯结晶器铜管结构,提高结晶器寿命和铸坯质量,利用商业有限元软件ANSYSTM建立二维连铸结晶器内钢水凝固传热及弹塑性应力有限元瞬态分析模型,铸坯传热边界采用与气隙相关的热流密度修正函数,建立与温度相关的热物性参数、力学性能和屈服函数,并利用多场间接耦合的方式对不同工况下的4种圆坯在结晶器内的凝固收缩变形过程进行数值模拟.结果表明,钢种和工况条件对铸坯边界凝固收缩过程影响显著,6瓣模型为4种计算模型的最优形状,依据铸坯边界凝固收缩曲线和新型结晶器设计准则,新型结晶器铜管结构设计采用凸型花瓣状内腔和大锥度设计.

Design of novel round copper mould tube cavity for continuous casting steels by numerical simulation

In order to optimize the round copper mould tube cavity and improve the guality of billet,the finite element model was employed to simulate the solidification and shrinkage of continuous casting steels by means of ANSYSTM.In the model,a gap-dependent heat transfer condition was adopted to modify the function of heat flux,and the material thermal properties,mechanical properties as well as the yield function were considered with the effect of temperature.The solidification and shrinkage behaviors of four round billets are simulated by indirect coupled method.The simulation results show that steels and working conditions have obvious influence on solidification and shrinkage of billets.Six-petal model is the best geometrical mould structure in the four optional shapes.According to the solidification shrinkage curves of billets and the design law for the novel mould,the convex petal and excessive taper were applied to the design of the novel round copper mould tube cavity.