Multi-cavity I-beam and high-precision soft mold forming and defect control method thereof

Abstract

The invention provides a multi-cavity I-beam and a high-precision soft mold forming and defect control method thereof. Aiming at structural features of multiple cavities, multiple molded surfaces, unequal thickness of marginal / web plates and high precision of molded surfaces inside cavities, silicone rubber soft mold pressurization is adopted to achieve the overall co-curing molding of the I-beamwith a complex structure. The multi-cavity I-beam comprises at least two main beams and at least six secondary beams, the main beams and the secondary beams are in the same plane, the main beams are not intersected with each other, the secondary beams located between the main beams are used for connecting the main beams, and the secondary beams located outside the main beams are used for connecting with the outside; equitable distribution of pressure in the X / Y / Z direction is achieved by adopting silicone rubber soft mold process gap compensation design, and the problem of unequal thickness pressurization of the marginal / web plates is solved; an internal soft-external hard pressure equalization design method is utilized to avoid the pressure deviation caused by uneven expansion of a soft mold, and the dimensional accuracy and internal defects of the molded surfaces inside the cavities are improved.

Description

technical field [0001] The invention relates to a multi-cavity I-shaped beam and its high-precision soft mold forming and defect control process, aimed at composite material engineering with multiple cavities and multiple profiles, unequal thickness of edges / webs, and high precision of cavity profiles. Shaped beam components adopt the "inner soft-outer hard" pressure equalization design method and "initial pressure-active pressure relief" curing process to achieve high-precision and high-quality manufacturing of multi-cavity I-shaped beams, which belong to the main load-bearing structure of composite materials Molding technology field. Background technique [0002] Carbon fiber reinforced composite I-beams have excellent characteristics such as high strength, high rigidity, fatigue resistance, and light weight, and have been widely used in the main connection support structure of aerospace delivery systems and missile weapon systems. In the field of aerospace, composite I-s...

AI Technical Summary

Problems solved by technology

However, the biggest weakness of silicone rubber soft mold expansion is the poor uniformity of local pressure, which leads to problems such as uneven thickness, poor flatness, and random distribution of internal defects in the inner cavity of the composite I-beam, which seriously affects the composite material. The quality stability and consistency of components will also have a great impact on the bearing capacity and structural stiffness of I-beam components.

With the increasing integration of structural design in the aerospace field, the overall structure of the I-beam is more complex, and the requirements for the dimensional accuracy and internal defects of the inner cavity are also significantly improved, and the traditional process methods cannot meet the design index requirements.

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