AP1000钢安全壳封头瓣片模压成形回弹模拟及补偿

Springback simulation and compensation of molded forming for steel AP1000 containment vessel head petals

采用PAM-STAMP 2G有限元软件,对AP1000钢安全壳大尺寸、中厚度、调质型高强度椭圆形封头瓣片在不同温度下的模压成形回弹进行有限元模拟分析。采用光顺几何补偿算法对模具型面的迭代回弹进行补偿修正,将封头瓣片实际成形后的偏差与模具型面补偿修正模拟的结果进行对比验证。研究结果表明:采用温模压成形可显著地改善封头瓣片的成形效果,其在500℃的模压成形回弹量最小;对于模压成形,通过模具型面补偿修正设计合理的型面尺寸,是瓣片获得理想成形精度的一种有效办法。

For steel AP1000 containment vessel with large dimension, medium thickness, tempered and quenched high strength elliptical head petals, the spring-back processes of molded forming under the different temperatures were simulated by finite element analysis software PAM - STAMP 2G. The iterative spring-back values of the die profile were compensated and corrected by the algorithm of smoothing geometry compensation, and the deviation of the actually formed petals was verified by the simulated result. The result shows that the forming quality of the head petals can be significantly improved by warm forming, and its spring-back reaches the minimum value at 500 ~C. Therefore, molded forming is an effective method to obtain perfect petal forming accuracy by designing reasonable profile dimensions based on the compensation and correction of die profile.