Preparation method of titanium alloy three-dimensional lattice sandwich structure

Abstract

The invention belongs to a titanium alloy structure forming technology, and in particular relates to a preparation method of a titanium alloy three-dimensional lattice sandwich structure. According to the invention, a titanium alloy three-dimensional lattice sandwich member is prepared by adopting a superplastic forming method, and the method of preparing the titanium alloy three-dimensional lattice sandwich structure by adopting a superplastic forming / diffusion connection process is proposed for the first time, therefore on one hand, the shape of a formed part, in particular to the titanium alloy three-dimensional lattice structure with a complex shape, can be accurately controlled, and on the other hand, the technical problem that a titanium alloy three-dimensional lattice sandwich layer is difficult to form is solved. The structure which is prepared by superplastic forming / diffusion connection has higher bonding strength because the three-dimensional lattice sandwich layer and upper and lower panels are bonded together by a diffusion connection method.

Description

technical field [0001] The invention belongs to the titanium alloy structure forming technology, and relates to a preparation method of a titanium alloy three-dimensional lattice interlayer structure. Background technique [0002] The three-dimensional lattice structure of titanium alloy can be prepared by the following method, such as figure 1 As shown, firstly, the titanium wires are interlaced layer by layer at a certain angle, and then under high temperature conditions, a fixed pressure is applied, and the heat preservation and pressure are maintained for a certain period of time, so that the titanium alloy wires between different layers are mutually diffused and connected together, and then Brazing (TiCuNi-60, at 20°C min -1 The speed is raised to 550°C, and the temperature is kept for 5 minutes, and then the temperature is raised to 975°C, and the vacuum degree is 10 -7 Under Torr conditions, heat preservation for 30min), the panel and the lattice structure are conne...

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Problems solved by technology

[0006] (1) The three-dimensional lattice structure of metal wire prepared by the diffusion connection method has a small spacing between layers and a small adjustable range. Generally, it can only have the diameter of a titanium alloy wire, and the designability is poor;

[0007] (2) The metal wires between different layers are connected together by the method of diffusion connection. During the diffusion connection process, the overall structure will be under pressure, resulting in a decrease in the height of the structure, and the required structure height is obtained, which has a certain the difficulty;

[0008] (3) For metal wires with small diameters, the metal wires are easy to bend during diffusion connection and need to be fixed with stainless steel nails;

[0009] (4) When preparing a metal lattice structure with a complex surface, it is necessary to bend the metal wire and perform diffusion connection, which is difficult to control;

[0010] (5) High cost

Electron beam rapid prototyping requires special electron beam and laser equipment to form lattice structures, and the cost is relatively high;

[0011] (6) The part structure after electron beam and laser rapid prototyping is cast structure, and the performance of the material is low;

[0012] (7) The surface roughness of the upper and lower panels after electron beam and laser rapid prototyping is relatively high, and subsequent processing is required;

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