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基于LS-DYNA软件平台建立换热器胀接工艺的仿真模型,研究包含支撑板结构的大型管-翅式换热器的胀接工艺过程。分析了胀接过程中翅片的变形及支撑板的存在对翅片的影响,对胀接工艺参数进行了优化,同时分析了胀接前后换热管内径的变化。结果表明,胀接过程中,与支撑板右侧相邻的翅片受到的轴向挤压力最大,危险性最高;适当增加翅片间隙可有效避免胀接过程中翅片的损坏;此外,变形区管壁材料的流动使得胀接后换热管内径略大于模具外径。
Based on LS-DYNA software platform, a simulation model of heat expansion process was established and the expansion process of large tube-fin heat exchanger with support plate structure was studied. The influence of the deformation of the fins and the existence of the support plate on the fins during the expansion process is analyzed, and the process parameters of the expansion process are optimized. The changes of the inner diameter of the heat exchange tubes before and after expansion are analyzed. The results show that in the process of expansion joint, the fins adjacent to the right side of the support plate have the highest axial compressive force and the highest danger. The proper increase of the fin gap can effectively avoid the damage of the fins during the expansion joint. In addition, The deformation of the wall material flow so that the expansion after the heat transfer tube diameter slightly larger than the outer diameter of the mold.