Abstract:

According to ITER vacuum vessel manufacturing standard, China fusion engineering test reactor (CFETR) vacuum vessel shells forming was pre-studied at room temperature. Firstly, the empirical formula was used to calculate the forming die dimension of the vacuum vessel shell which was mostly determined by the mechanical properties of material. Then, the bending process was simulated with finite element software for three nearby values in which the optimal profile errors of the shell meet the demand of ±1.5mm. Finally, the optimal dimensional values of the molds were confirmed to guide the forming experiment study. The actual profile errors, the thickness reduction, the maximum spring back and deformation were measured in the experiment. The results are in reasonable agreement with the finite element analysis data, verifying the suitability of the forming die design.

Key words: Vacuum vessel, Forming, Die design, Spring-back

摘要：

参考ITER真空室制造规范，在常温下对中国聚变工程实验堆(CFETR)真空室壳体成型进行工艺预研。先根据成型经验公式计算出所研究壳体的成型模具尺寸范围，再利用有限元软件选择3组公式值附近的尺寸模拟了该成型工艺最佳模具尺寸参数，分析出最佳型面尺寸误差在±1.5mm内，并以此指导成型实验。测试了成型实验后工件减薄量、回弹量、变形率等参数，与模拟分析结果吻合度较高，验证了该成型模具设计的合理性。

关键词: 真空室, 成型, 模具设计, 回弹