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铸件铸造过程热应力分析是铸件凝固过程数值模拟的重要组成部分,对于优化铸件的工艺设计、分析铸件凝固冷却过程中温度场变化引起的应力变化趋势,提高铸件质量有重要作用。本文应用ANSYS软件,对圆坯连铸过程结晶器内逐渐凝固形成的坯壳进行了热应力模拟,分析了拉坯速度、热流边界条件、圆坯尺寸以及浇注温度对结晶器出口处铸坯质量的影响。结果表明,冷却效果好,坯壳易形成,厚度较厚,但冷却中铸坯的温度梯度较大,结晶器出口处的最大等效应力值高。同时,结晶器出口处的坯壳厚度随浇注温度的升高而变薄。
The analysis of thermal stress during casting process is an important part of numerical simulation of casting solidification process. It plays an important role in optimizing process design of casting and analyzing the trend of stress change caused by temperature field in casting solidification and cooling process and improving the quality of casting. In this paper, ANSYS software was used to simulate the solidified shell gradually formed in the mold of round billet continuous casting. The effects of casting speed, boundary conditions of billet, round billet size and pouring temperature on the quality of billet Impact. The results show that the cooling effect is good, the shell is easy to form, and the thickness is thick. However, the temperature gradient of the slab during cooling is large, and the maximum equivalent stress at the outlet of the mold is high. At the same time, the thickness of the shell at the outlet of the mold decreases with the increase of pouring temperature.