Die for RFI integral forming of J-shaped composite material stiffened wall plate

Abstract

The invention belongs to a low-cost manufacturing technology of a high-performance resin matrix composite material, and provides a die for RFI integral forming of a J-shaped composite material stiffened wall plate. The die comprises a stiffened inner side die A (1), a stiffened inner side die B (2), a stiffened outer side die (3), a skin outer shape die (4), a skin inner shape die (5), a transverse positioning beam (6), a positioning block (7), a pin sleeve (9), a plug pin (10) and a positioning pin (11). According to the die, the requirements for the wall plate forming quality, the profile and the position precision are guaranteed, the die demolding difficulty after curing is reduced, and meanwhile the die manufacturing difficulty and the manufacturing cost are reduced.

Description

technical field [0001] The invention belongs to the low-cost manufacturing technology of high-performance resin-based composite materials, and relates to a mold for the integral molding of "J"-shaped reinforced wall board RFI of composite materials. Background technique [0002] In order to meet the demand for weight reduction and cost reduction of composite structures, the aircraft structure design department designs more composite components as integral panel structures. "J" type stiffened panel is a kind of reinforced panel commonly used in the structure of wing, fuselage and cabin door. An aircraft panel is designed as a reinforced wall with multiple "J" shaped long trusses In the form of panels, the structural size is large, and the length of the reinforcement is more than 4 meters. In order to improve the structural integrity and reduce the use of fasteners, the lower flange of the girder and the skin adopt the suture technology, and the resin film infiltration (Resin ...

AI Technical Summary

Problems solved by technology

However, the traditional mold solution cannot meet the overall molding requirements of the RFI process for such reinforced wall panels, because a prominent feature of the RFI process is different from the prepreg / autoclave process: the resin matrix required for structural molding needs to be packaged In-process pre-wetting of dry fibers during molding

However, the placement method of the traditional RFI resin film cannot meet the high-quality requirements of the complex structure. In order to meet the high-quality requirements of the interior and surface of the aerospace composite structure, the traditional RFI process has been improved. The mold structure needs to meet the RFI process resin film laying and The need for resin flow, for "J" type reinforcement molding, the traditional solid male mold structure cannot implement resin laying

On the other hand, because the "J"-shaped reinforced mold is slender and weak in rigidity, it is difficult to process and prone to processing deformation. For the "J"-shaped reinforced mold that requires high profile and position accuracy, the positioning of the "J"-shaped reinforced mold is problematic. At the same time, the problem of processing deformation will cause the inner and outer molds to not fit in place, which not only affects the internal quality of the parts, but also causes the problem of thickness tolerance. It can be seen that the "J" type reinforced inner and outer molds have become the influence of large size "J" The Key to Forming Quality of Type-Reinforced Wall Panels

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