Filled 0-degree carbon fiber prepreg preforming tooling and preforming process

Abstract

The invention discloses a filled 0-degree carbon fiber prepreg preforming tooling and a preforming process. The tooling comprises a forming pressure plate, forming mandrels, a base plate and limit stops, wherein multiple forming mandrels are closely and parallelly arranged on the base plate, the chamfers of the forming mandrels are consistent with an R angle of a long joist, filled 0-degree carbon fiber prepregs are located at the chamfers of the forming mandrels, the pressure plate is arranged above the mandrels, and the outer sides of the mandrels at the two ends are respectively provided with a limit stop. The preforming process comprises the following steps: (1) manufacturing a preforming tooling; (2) calculating the theoretic application amount of filled 0-degree carbon fiber prepregs; and (3) filling the 0-degree carbon fiber prepregs: weighting the 0-degree carbon fiber prepregs, cutting the 0-degree carbon fiber prepregs into fiber bundles with a size of 3-4mm, feeding the cut 0-degree carbon fiber prepregs into the preforming tooling, slightly compacting the prepregs by using a scraping plate, and after the prepregs are subjected to vacuum compaction on a heating platform at temperature of 70-80 DEG C for 15 min, transferring the prepregs to a normal-temperature workbench for cooling, and then taking out the obtained products. According to the invention, the forming quality of long joists is improved, and a situation that the shape of long joists after being manufactured is irregular is greatly improved.

Description

technical field [0001] The invention relates to a long stringer filled with 0° carbon fiber prepreg preforming tooling and a preforming process, which is used for preforming composite material I-shaped, T-shaped long stringer triangular area filling fibers, so as to ensure that the composite material stringer The triangular area is fully filled to ensure the quality of the stringer, and belongs to the technical field of composite material forming. Background technique [0002] The horizontal tail panel and vertical tail panel of a certain model are all made of composite materials, and the reinforcing ribs are I-shaped long trusses. The I-shaped long truss made of composite materials is divided into 6 parts for manufacture, namely the left U-shaped structure and the right U-shaped structure. The upper triangular area is filled with 0° carbon fiber prepreg and covered with fiber laminates; the lower triangular area is filled 0° fiber prepreg, covered fiber laminate. During t...

AI Technical Summary

Problems solved by technology

When molding, the 0° carbon fiber prepreg is filled into a roll blank, which is different from the triangular shape formed when the left and right U-shaped blanks are combined. Due to the high temperature during curing, 0° carbon fiber prepreg and U-shaped blanks are filled It becomes softened when heated. Because there is no peripheral restriction, the filling of 0° fibers and the shape of the left and right U-shaped blanks are uncontrollable. After forming, the fibers appear local bending deformation, which causes local quality problems of the stringer, such as voids and surface concaves. Quality defects such as scratches have a great impact on the strength and mechanical properties of the truss

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