CN111469344A - Metal and composite material connecting method based on bionic structure - Google Patents

Abstract

The invention discloses a method for connecting metal and composite materials based on a bionic structure. By 3D printing a reasonably arranged microstructure, assisting a metal surface treatment process such as a physical or chemical method, the microstructure is filled with molding means such as injection molding or molding. The composite material or its matrix material is used to connect the main structure of the composite product, and the connection strength of the composite material is improved while reducing the weight of the structure. Under the same connection performance conditions, the stress concentration of the mechanical connection and the wear failure of the cementation are avoided; during the inspection and repair process, if the internal microstructure of the metal is not damaged, the metal part can be reused.

Description

A method for joining metal and composite materials based on biomimetic structures

technical field

The invention belongs to the technical field of material connection, and in particular relates to a metal and composite material connection method based on a bionic structure.

Background technique

3D printing, also known as additive manufacturing, is a technology that manufactures three-dimensional products through 3D printing equipment based on the designed 3D model. Due to its high manufacturing flexibility, it plays an important role in industrial production and daily life. Lightweight design technology is to rationally design products by removing materials or changing materials according to the original product model to meet the requirements of weight reduction. At present, the combination of lightweight technology and 3D printing technology lies in the lightweight design of some product structures that cannot be satisfied by traditional manufacturing processes. 3D printing technology can be used to quickly manufacture products.

The use of composite materials is an effective method to reduce the weight of products and improve the strength of parts. Lightweight composite materials have a large market application, which is particularly prominent in aerospace and automobile manufacturing. Commonly used composite material connection technologies mainly include mechanical connection, cementation and hybrid connection, and new processes include Z-pin connection. However, traditional composite material connection technology will cause defects such as stress concentration or bonding failure, which cannot meet the requirements of metal and composite material connection based on bionic structures.

SUMMARY OF THE INVENTION

In view of the above technical problems, the present invention provides a metal and composite connection method based on metal additive microstructure refilling.

In order to realize the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

A method for connecting metal and composite materials based on bionic structure, comprising the following steps:

Step 1, arranging microstructures on the surface of the metal joint to be connected;

Step 2, performing surface treatment on the metal joint;

In step 3, the composite material is filled into the microstructure, thereby realizing the connection of the metal and the composite material.

Further, in step 1, 3D printing technology is used to arrange the microstructure on the surface of the metal joint. In order to realize the transfer of physical quantities such as stress and strain, it is necessary to design a reasonable microstructure to ensure the overall connection strength of the product.

Further, the surface treatment process in step 2 is chemical treatment or physical treatment. The surface of the metal microstructure is effectively treated by means of physical or chemical treatment, and the connection between the surface of the microstructure and the composite material is enhanced under the condition of ensuring its performance.

Further, in step 3, the composite material can be filled into the microstructure by means of injection molding, molding or in-situ curing, so as to connect the two-phase parts.

Further, the metal and composite materials are both lightweight and high-strength materials.

Beneficial effects: the present invention can reasonably design the parts, take the additive method as the main design method, assist the metal surface treatment processes such as physical or chemical methods, and fill the microstructure with high-performance other light-weight materials by molding methods such as injection molding or molding. quality material to achieve better connection strength. Under the same performance conditions, the stress concentration of mechanical connection and the long-term reliability of cementation can be avoided; according to the difference of composite materials, the stability of the overall structure can be strengthened to a certain extent; in the process of inspection and repair, if the internal microstructure No damage, the metal joint part can be reused for easy maintenance.

Description of drawings

Fig. 1 is the technical route of the metal and composite material connection method based on the bionic structure of the present invention.

FIG. 2 is a three-dimensional perspective view of the metal portion in Example 1. FIG.

3 is a three-dimensional perspective view of the composite material portion in Example 1. FIG.

FIG. 4 is a three-dimensional perspective view of the overall structure distribution in Example 1. FIG.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be more clearly defined.

The invention provides a metal and composite material connection method based on a bionic structure, which uses a microstructure-based filling method to toughen and reinforce the product. The specific process is shown in Figure 1, including the following steps:

Step 1: Arrange microstructures on the surface of the metal joint to be connected. A reasonable internal microstructure is designed to transmit physical quantities such as stress and strain. Its structure needs to ensure the overall connection strength of the product, and also meet the requirements of 3D printing and other processes.

In step 2, surface treatment is performed on the metal joint, and the surface of the metal microstructure is effectively treated by means of physical or chemical treatment, and the connection between the surface of the microstructure and the composite material is enhanced under the condition of ensuring its performance.

Step 3: Fill the microstructure with the composite material. The filling process needs to reasonably select injection molding, molding, in-situ curing, etc. according to the type of the composite material, so as to realize the connection between the metal and the composite material.

The above metals and composite materials are both light-weight and high-strength materials.

Through the above method, the present invention can reasonably design components, arrange reasonable microstructures through 3D printing, assist metal surface treatment processes such as physical or chemical methods, and fill composite materials or their microstructures with molding methods such as injection molding or molding. The matrix material is connected to the main structure of the composite product, and the connection strength of the composite material is improved while reducing the weight of the structure. Under the same connection performance conditions, the stress concentration of the mechanical connection and the wear failure of the cementation are avoided; during the inspection and repair process, if the internal microstructure of the metal is not damaged, the metal part can be reused.

Example 1

Figure 2 is a metal joint to be connected in this embodiment, which is manufactured by additive materials, including a solid area and a microstructure area. The solid area undertakes specific functions, and the microstructure area undertakes the connection function with the composite material; Figure 3 shows the connection part of the composite material , including the composite material solid area and the filling connection area, the solid area undertakes specific functions, and the filling connection area forms a connection with the microstructure area in Figure 2.

FIG. 4 is the whole after the metal joint and the composite material are connected in this embodiment. The metal area and the composite area are connected through the connection area with a microstructure, and the metal area and the composite material area realize their respective functions.

Claims (5)

1. A metal and composite material connection method based on a bionic structure is characterized in that: the method comprises the following steps:

step 1, arranging a fine structure on the surface of a metal joint to be connected;

step 2, carrying out surface treatment on the metal joint;

and 3, filling the composite material into the fine structure, thereby realizing the connection of the metal and the composite material.

2. The connecting method according to claim 1, characterized in that: in the step 1, a fine structure is arranged on the surface of the metal joint by adopting a 3D printing technology.

3. The connecting method according to claim 1, characterized in that: the surface treatment process in the step 2 is chemical treatment or physical treatment.

4. The connecting method according to claim 1, characterized in that: in step 3, the composite material can be filled into the fine structure by injection molding, mold pressing or in-situ curing.

5. The connecting method according to claim 1, characterized in that: the metal and the composite material are both light high-strength materials.

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