Method for forming composite material joints by using multi-directional composite material joint rtm mold

Abstract

The invention relates to a method for forming a composite material joint by adopting a multi-direction composite material joint RTM mould. According to the method, a multi-direction joint fiber prefabricated body is arranged in an RTM mould designed with a prefabricated hole core mould; assembling and sealing detection of the mould are completed; vacuumizing is carried out, and meanwhile preheating resin is injected in a pressurizing mode; after resin mould filling is completed, a resin injection opening and a resin outlet are sealed, the mould is wholly placed in an oven to be heated, and the fiber prefabricated body is fully soaked with the resin in the mould along with rising of the temperature; chemical reaction happens under the high-temperature action, and curing and forming are completed. Precise forming of the carbon fiber reinforced resin-based composite material multi-direction joint and precise forming of the mounting hole position of an embedded part of the joint can be achieved, through structural design of the mould, a prefabricated hole of the multi-direction joint can be directly formed, secondary machining is not needed, it is ensured that fibers in the opening are continuous, production and machining defects are avoided, and therefore the mechanical property of the product is ensured.

Description

technical field [0001] The invention relates to a method for forming a composite material joint by using a multi-directional composite material joint RTM mold, belongs to the technical field of carbon fiber reinforced resin-based composite material structure forming technology, and is applied to the development of spacecraft composite material structure products. Background technique [0002] Resin transfer molding technology (Resin Transfer Molding, RTM) is a typical non-autoclave low-cost material preparation technology. Its main advantage is that it can manufacture high-precision complex configuration parts and maintain high structural design efficiency. Connectors, various brackets, etc. [0003] The RTM molding process is under the condition of pressure injection or external vacuum assistance, a liquid, reactive low-viscosity resin flows in a closed mold and degasses, while infiltrating and impregnating the dry fiber structure. After the impregnation is completed, the ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, provide a method for forming composite material joints using multi-directional composite material joints RTM molds, and solve the problem of precise installation holes of carbon fiber-reinforced resin-based composite material multi-directional joints and their embedded parts. For forming problems, the prefabricated holes of multi-directional joints are directly formed through the design of the mold structure, without the need for secondary machining, to ensure continuous fiber at the opening and avoid processing defects, thereby ensuring the mechanical properties of the product

Images