Airbag capable of being used for composite omega stringer co-curing forming

Abstract

The invention belongs to the technical field of curing forming, and particularly relates to an airbag capable of being used for composite omega stringer co-curing forming. The airbag comprises an outer unvulcanized rubber layer, R-angle reinforced fibers, carbon fiber reinforced fabric, an inner unvulcanized rubber layer and a vacuum bag. The outer unvulcanized rubber layer is arranged on the outermost layer of the airbag, and the section of the outer unvulcanized rubber layer is consistent with the inner profile of an omega stringer. At the R-angle position of the airbag, the R-angle reinforced fibers are attached to the inner wall ridges of the outer unvulcanized rubber layer, and it is guaranteed that the airbag is attached to the inner profile of the omega stringer. The inner unvulcanized rubber layer is located in the outer unvulcanized rubber layer, a layer of carbon fiber reinforced fabric is laid at the cap waist position of the inner unvulcanized rubber layer, and the carbon fiber reinforced fabric is compacted between the inner unvulcanized rubber layer and the outer unvulcanized rubber layer. The inner unvulcanized rubber layer is filled with the vacuum bag. After the airbag is used every time, the vacuum bag is replaced, and the airbag can be reused.

Description

technical field [0001] The invention belongs to the technical field of solidification and molding, and in particular relates to an airbag which can be used for co-curing and molding of composite Ω stringers. Background technique [0002] The Ω-shaped stringer is a part of a semi-closed structure. Compared with the traditional I-shaped, C-shaped and L-shaped stringers, the forming of the Ω-shaped stringer is more difficult. Usually, the male mold forming mold is used to cure the Ω-shaped stringer separately , and then connected to the skin by bonding co-curing or secondary bonding. The molding process of the entire part needs to be solidified in the tank at least twice, and the production cycle is long and the cost is high. If the co-curing molding technology is adopted, a cavity will be formed after the combination of the Ω stringer and the wall plate. How to ensure the internal pressure and the quality of the inner surface of the cavity is the key to the co-cure molding tec...

AI Technical Summary

Problems solved by technology

However, the above method still has some limitations

First of all, using a vacuum bag to pressurize is likely to fail due to the damage of the vacuum bag, resulting in defects or even scrapping of the entire part; secondly, the vacuum bag itself has no strength, and its profile is difficult to be consistent with the internal profile of the Ω stringer. In the process, there is often the problem of poor pressurization effect on the R corner of the stringer, and the actual product produced often has defects such as delamination and pores at the R corner of the stringer

The shape of the solid rubber mandrel can be kept consistent with the inner shape of the Ω stringer, and the R angle pressurization effect is better, but the expansion of the rubber is not easy to control, and it is easy to cause the horizontal side of the stringer to be erected due to excessive expansion. In this case, the underside of the long stringer will have internal defects due to insufficient pressure, and it cannot be proved theoretically that the pressure exerted by the rubber on the long stringer due to thermal expansion always meets the requirements of the design documents. In the manufacture of civil aircraft parts During the process, the solid rubber core mold molding scheme is often not accepted by customers

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