Method of preventing poor glue or pinholes on surface of non-autoclave vacuum bag forming composite

Abstract

The invention relates to a method of preventing poor glue or pinholes on the surface of a non-autoclave vacuum bag forming composite. The method comprises the following steps: step 1, duplicating a prepreg; step 2, arranging a breathable felt, a vacuum nozzle and a vacuum detection meter on a flat plate mold by using the duplicated prepreg, manufacturing a vacuum bag, and conducting vacuumizing for compacting; step 3, removing back lining paper from the compacted prepreg, and laying and pasting a non-porous isolating membrane or a peel ply by fitting the flat plate mold; and step 4, conducting follow-up layer laying and pasting, manufacturing a vacuum bags, and conducting solidification forming. By using the method disclosed by the invention, on the basis without changing an original structure, a process design and a material system, the problem of poor glue or pinholes on the surface of the forming composite is solved, the quality of a product is improved, the rejection rate is reduced, and the cost is saved.

Description

technical field [0001] The invention relates to a method for preventing the lack of glue or pinholes on the surface of a non-autoclave vacuum bag forming composite material, and belongs to the technical field of composite material forming. Background technique [0002] With the increasingly urgent demand for low-cost manufacturing of composite structural parts for aerospace, the research and application of non-autoclave technology is becoming more and more extensive. Among them, the laying and vacuum bag making process of non-autoclave prepreg vacuum bag forming process is similar to the autoclave process, except that the curing site is transferred to an oven or curing furnace that is cheaper and does not need to provide external pressure. It does not need to be limited by the size of the autoclave and its high energy consumption, but also inherits the methods and advantages of the autoclave forming process to the greatest extent. The mechanical properties and porosity of th...

AI Technical Summary

Problems solved by technology

Among them, the autoclave assisted pressurization method and the method of changing the weaving form of the fabric involve major changes to the process or design, such as increasing the resin layer of the surface film or increasing the resin content in the prepreg, that is, the surface is improved by increasing the resin content. , the material system needs to be adjusted accordingly, but the increase of the resin content will cause the fiber content to decrease, which will also have an inestimable impact on the performance of the composite material

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