The invention relates to a process, in particular to a hollow structure
composite material closed die bag pressure one-step molding process. In the process, a part higher than a joint part and an upper die
composite material decreasing part are preserved during the plastering of a lower die and are integrated to be one close and united body in overlapping and pressuring way under the function of an
airbag. Composite materials can be added on the outside of the
airbag to achieve higher strength. Meanwhile, multi-
airbag external auxiliary composite materials can be adopted to be prepared into stiffened fasting products during the hollow preparation to obtain higher strength. The
composite material closed die bag pressure one-step molding process has the advantages of simple equipment, time and labor saving performance, no waste materials,
pollution-free, manufactured products with high strength, hollow one-step molding, hollow stiffened one-step molding, and the like, and is an ideal process for manufacturing
tower tanks, wind blades, helicopter rotary blades,
airplane empennages, etc.