Abstract: Composite propeller has obvious advantages compared to traditional metal propeller such as resistant corrosion, high specific strength and excellent acoustic damping performance. There are immeasurable application prospects in the aerospace and ship vessel. The design of mold plays a capital and irreplaceable role in variety of factors about composite propeller molding. The physical design exists many challenges for the high production efficiency and precision. The super invar was selected as the material of mold cavity according to the forming factors of carbon fiber composite, such as the expansion coefficient. Three criterions of the propeller blade hub were determined based on the requirement of assembling. Then, the cavity of mold was designed that was pushed out integrally and separated into several parts during the demolding. Finally, the mold of the blade was assembled and the composite propeller blade was fabricated, which prove the correction and feasibility of this design. The difficulties of forming and demolding about the composite are solved.

Key words: carbon fiber, propeller blade, compression molding, mold design