Composite material and metal component dovetail groove integrated forming connection structure and method

Abstract

The invention provides a composite material and metal component dovetail groove integrated forming connection structure and method. The structure comprises a metal component, a composite material component and a composite material prefabricated block; the metal component is provided with a dovetail groove; the composite material component comprises a composite material body and a composite material connection part, the composite material connection part comprises a composite material forming structure which is arranged in the dovetail groove, the outer surface of the composite material forming structure is attached to the inner surface of the dovetail groove, and the composite material forming structure and the composite material body are integrally formed; and the composite material prefabricated block is used for fixing the position of a reinforcing material of the composite material forming structure in the dovetail groove and is arranged in the composite material forming structure in a filling manner, and the outer surface of the composite material prefabricated block is attached to the inner surface of the composite material forming structure. According to the structure and the method, before a composite material is formed, the reinforcing material and the dovetail groove are firstly effectively combined, then integrated forming is carried out, so that the connection structure has the connection strength and the sealing function of the composite material and metal at the same time, and many defects of mechanical connection and adhesive connection of the composite material and the metal component are avoided.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to an integrated molding connection structure and method of a composite material and a dovetail groove of a metal part. Background technique [0002] In the process of composite material parts, it is often encountered that composite materials and metal parts need to be connected. At present, the commonly used connections are mechanical connections and adhesive connections. [0003] The mechanical connection is to prepare the metal part and the composite material part separately, and use fasteners (such as screws) to fasten the metal part and the composite material part. At the same time, in order to ensure the sealing effect, the sealing groove is often processed on the surface of the metal part. Rubber, tetrafluoroethylene and other elastic material sealing rings are used to seal the connection position. For example, the Chinese patent document with the pub...

AI Technical Summary

Problems solved by technology

However, the mechanical connection has the following disadvantages: 1. Stress concentration. The mechanical connection needs to open holes at the connection position of the composite material and the metal part to place fasteners such as screws. Usually, the strength of the metal part is higher than that of the composite material, and the metal part is not suitable for the hole. The damage is not obvious, but for composite materials, the opening process may cause delamination between layers, and at the same time, the opening of the composite material is used as a connection position in the subsequent use process, which will cause a large stress concentration phenomenon, resulting in composite material Localized damage, which can lead to composite joint failure

2. The quality of the connection surface of composite materials is difficult to guarantee. When connecting large-sized parts, in order to ensure the sealing effect between composite parts and metal parts, the metal parts can be finely machined to obtain high-quality dimensional accuracy and surface finish. , but for composite materials, it is difficult to effectively guarantee the surface finish after machining. If RTM and other processes are used to form and rely on molds to ensure surface finish, a resin-rich layer will often be formed on the surface, which is not conducive to the connection strength, and its size is in the mold. There may be deformation after demoulding

However, the adhesive connection has the following disadvantages: 1. The bonding position, bonding angle, etc. of the bonding surface of the composite material part and the metal part need to be calculated and designed according to the actual use of the product, and the bonding strength is affected by the thickness of the adhesive layer, Influenced by the implementation details of the bonding process, etc., the dispersion is large

2. When connecting by bonding, the components may be damaged after being subjected to a certain degree of vibration, impact and other loads during use, resulting in local debonding of the bonding surface, and stress concentration is easily formed at the debonding position of the bonding surface. The damage expands in the subsequent use, and then causes the connection to fail. It is difficult to ensure the reliability of the connection between the composite material part and the metal part.

Images