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

Abstract

The invention provides a composite material and a metal component dovetail groove integrated forming connection structure and method, the structure includes: a metal component, provided with a dovetail groove; the composite material component includes: a composite material main body and a composite material connection part, the composite material connection part includes a composite material The molding structure is set in the dovetail groove, and the outer surface is attached to the inner surface of the dovetail groove, and the composite material molding structure is integrally formed with the composite material main body; the composite material prefabricated block is used to fix the reinforcing material of the composite material molding structure in the dovetail groove The position in the center is filled inside the composite material forming structure, and the outer surface of the composite material prefabricated block is bonded to the inner surface of the composite material forming structure. In this structure and method, before the composite material is formed, the reinforcing material and the dovetail groove are effectively combined, and then the integrated molding is carried out, so that the connection structure has both the strength and the sealing function of the connection between the composite material and the metal, and the composite material and the metal part are avoided. There are many disadvantages of mechanical connection and adhesive connection.

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.

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