新型连铸结晶器冷却结构的铜板热-力学行为

摘要

建立板坯连铸结晶器三维热力耦合有限元模型，通过比较结晶器铜板宽面弯月面处横截面的温度、热应力及变形分布，考察结晶器新型冷却结构对铜板热-力学行为的影响规律。结果表明：在弯月面处宽面热面，新型铜板的最高温度较传统铜板的低60℃，最大热应力小85 MPa，且新型铜板与传统铜板最大变形分别为0.21 mm和0.29 mm；新型铜板和传统铜板弯月面处宽面热面温度、热应力和法向变形波动幅度分别为12℃和67℃，33 MPa和113 MPa以及0.02 mm和0.09 mm。因此，新型结构铜板温度、热应力和变形量分布均匀性和合理性比传统的有明显改善，更适合裂纹敏感性钢种的浇铸。%A three­dimensional thermo­mechanical coupled finite element model was established, the temperature, von Mises stress and displacement distribution of new cooling structure mold were compared, the effect of the new cooling structure mold on copper plate thermo­mechanical behavior was studied. The results show that in wide hot face of copper plate at meniscus, the highest temperature and the maximum von Mises stress of new mold are 60℃and 85 MPa lower than those of traditional mold, respectively. Meanwhile, the corresponding maximum norm displacements of new and traditional molds are 0.21 mm and 0.29 mm, respectively. The fluctuation range of temperature, von Mises stress and displacement of new and traditional mold at location mentioned above are 12℃and 67℃, 33 MPa and 113 MPa, 0.02 mm and 0.09 mm, respectively. Consequently, the temperature, von Mises stress and displacement distribution of new mold copper plate are more uniform and reasonable than those of traditional mold copper plate, indicating that the new mold copper plate is more suitable for the casting of cracking sensitive steel grade than traditional mold.