短切玻璃纤维增强聚醚醚酮承力支架研制

Development of Bearing Bracket Made From Polyether Ketone by Shot Glass Fiber Reinforced

为加工某航天器高性能承力支架零件,本文对不同玻璃纤维含量的短切玻璃纤维增强聚醚醚酮(SGF/PEEK)的力学性能进行了分析,利用Moldflow分析软件对承力支架注塑模具、注塑工艺参数进行了优化。结果表明,30wt%的SGF/PEEK作为承力支架材料时力学性能最优,模流分析有效预测注塑过程,改善主流道及二级流道尺寸可有效提升保压效果,保压压力和模具温度对承力支架翘曲变形的影响最为显著,得出一组优化的工艺参数,采用该参数成型的零件已成功应用于某航天器燃料贮箱中并通过了飞行考核。

In order to obtain high-performance bearing bracket for spacecraft, the mechanical properties of short glass fiber reinforced polyether ketone （SGF/PEEK） with different fiberglass content were analyzed. And the injection mold and injection process parameters were optimized by the software of Moldflow. The results show that the mechanical properties of 30wt% SGF/PEEK are optimal. The mold flow simulation can predict the injection process effectively. Improving the sizes of main and secondary runners can effectively enhance the effect of pressure holding. The holding pressure and the mold temperature have remarkable influences on the warpage deformation of bearing brackets. The brackets formed by optimized process parameters have been applied to spacecraft fuel tanks successfully and passed the flight assessment.