发动机舱口盖既要考虑结构强度、刚度和稳定性，又要满足服役温度及减重需求，因此选用高温双马来酰亚胺树脂基复合材料制造发动机舱口盖。使用高温固化双马来酰亚胺高强碳纤维预浸料CCF800H/QY260E，采用共固化及二次胶接工艺制备大曲率复杂加筋结构口盖制件，可于230 ℃高温环境下长期服役。研究了高温树脂基复合材料制件成型工艺方法、闭合环形加强边铺叠方法及高效快捷低成本的长桁、加强边定位方式。完成了高温树脂基复合材料制件工艺辅助材料、工装结构及材质、热压罐设备及配件的优化选择，成功制备出耐高温的大曲率加筋复杂结构口盖制件。

The engine hood cover should not only consider the structural strength, stiffness and stability, but also meet the service temperature and weight reduction requirements, so the high temperature bismaleimide resin matrix composite is selected to manufacture the engine hood cover. CCF800H/QY260E, a high-temperature cured bismaleimide high-strength carbon fiber prepreg, was used to prepare a large curvature and complex stiffened mouth cover by co-curing and secondary bonding process, which can serve for a long time at 230 ℃. The molding technology of high temperature resin matrix composite parts, the method of laying closed ring reinforced edges and the positioning mode of stringer and reinforced edges with high efficiency and low cost were studied. The optimal selection of process auxiliary materials, tooling structure and materials, autoclave equipment and accessories for high temperature resin matrix composite parts was completed, and the high temperature resistant large curvature stiffened complex structure flap parts were successfully prepared.