To obtain the hat-stiffened stringer wall plate with high quality, the forming method of vacuum bag core mould is improved. This paper presents a method to combine the silicon rubber core module with the vacuum core module, obtaining the hat-shaped stringer wall plate with high surface quality. It meets the requirement of dimension accuracy of composite hat-shaped stringers-skin with co-curing molding. Using the finite element simulation method, this paper studies the influence of the size of silicon rubber core mould and the properties of silicon rubber material on the thickness uniformity of stringer. The results show that the harder the core mold is, the less uniform the stringer is. The accuracy of the theoretical analysis is verified by the stringer thickness obtained under different conditions. Taking the influence of silicone rubber hardness on the uniformity of stringer dimension and process operation into consideration, finally, 50HA is selected as the hardness of the silicon rubber, and the measured average thickness of the skin-stringer deviates less than 6% from the theoretical thickness. The microanalysis shows that the fiber trend of the connection between skin and hat-shaped stringer has no deformation.
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