Microwave high-pressure intermittent curing method for fiber-reinforced resin base composite material and die

Abstract

The invention relates to a method for processing a fiber-reinforced composite material structural piece and a matched die. The method and the die are used for processing high-thickness or large-size fiber-reinforced composite material structural piece. By the method, under a high-pressure inert gas environment, a composite material prefabricated piece which is in a moving state and is placed on a light-mass die is heated and cured by a microwave magnetron with linearly adjustable power in an intermittent manner by a plurality of warming rate modes, so that the quality and the performance of the structural piece are improved. Compared with the conventional technology for curing the composite material structural piece by a thermal pressing tank, the fiber-reinforced composite material structural piece with high performance, high size stability and high geometric precision has the advantages that the time is shortened, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a processing method of a fiber-reinforced composite material component and a matching mold. The invention is applied to processing a large-thickness or large-scale fiber-reinforced composite material component. Background technique [0002] Fiber-reinforced resin-based composite materials have a series of advantages such as high specific strength, high specific modulus, thermal conductivity, heat insulation, sound insulation, vibration reduction, high (low) temperature fatigue resistance, and good dimensional stability. Composite components are developing in the direction of integration, integration, and large-scale. By adopting an integrated overall fuselage component structure, the number of parts and the weight of the aircraft are significantly reduced, and the production method is simpler and the product is more reliable. As the application of composite materials develops from the secondary load-bearing structure to the mai...

AI Technical Summary

Problems solved by technology

When the conventional autoclave process is used to process large-thickness composite components (thickness greater than 2cm), a large amount of curing heat may be generated inside the composite component, resulting in problems such as thermal runaway and resin deterioration. It may also cause internal and external curing due to a large temperature gradient. Problems of unevenness, incomplete curing, and large curing deformation

[0003] Microwave heating simultaneously heats the inside and outside of the composite material component, making it possible for the composite material component to be uniformly cured, but there are many defects in the existing microwave curing process: 1) It is mainly heated by continuous heating, the rapidity of microwave heating, and the selection of materials Due to the characteristics of non-uniformity and uneven field strength in the resonant cavity, it is easy to cause the local temperature inside the component to be out of control, so that the uniformity of curing of the composite material component cannot be guaranteed; 2) The existing microwave curing process is either at normal pressure or at a lower pressure In the environment, the compactness and strength of the final composite material components cannot be guaranteed; 3) The existing molds for microwave curing either have poor heat conduction, resulting in uneven temperature on the contact surface between the components and the mold, or the large thermal expansion coefficient cannot guarantee the size and shape of the composite material components. Precision, or the mold is very heavy, inconvenient to transport and install, and the price is too expensive to meet the requirements of curing large composite components

4) A pair of molds for existing microwave curing molds are often suitable for composite materials that are easy to absorb microwaves and allow microwaves to penetrate or suitable for composite materials that are not sensitive to microwaves and cannot penetrate well. Curing Requirements for Composites

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