Forming method of superplastic forming/diffusion connecting four-layer structure of grid with variable depth-width ratio

A technology of diffusion joining and superplastic forming, applied in the field of surface wrinkle prevention, which can solve problems such as surface wrinkling

Active Publication Date: 2014-10-15
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of surface wrinkle defects that often occur in the four-layer structure with variable aspect ratio grids in the superplastic forming / diffusion bonding process. Forming method of superplastic forming / diffusion bonding four-layer structure

Method used

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  • Forming method of superplastic forming/diffusion connecting four-layer structure of grid with variable depth-width ratio
  • Forming method of superplastic forming/diffusion connecting four-layer structure of grid with variable depth-width ratio
  • Forming method of superplastic forming/diffusion connecting four-layer structure of grid with variable depth-width ratio

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Experimental program
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Embodiment

[0032] by figure 2 The four-layer thin-walled structure shown as an example was formed by anti-wrinkle superplastic forming / diffusion bonding process. The specific process is as follows:

[0033] 1) It is estimated that there are 9 grids in this part, and they are sorted from bottom to top as 1, 2, 3, 4, 5, 6, 7, 8, 9; 2, 4, 6, and 8 grids The aspect ratio is the same, and the aspect ratios of grids 1, 3, 7, and 9 are the same; and grid 5 at the center has the largest aspect ratio, followed by grids 2, 4, 6, and 8. The smallest ratio is the 1st, 3rd, 7th, and 9th grids;

[0034] 2) Design air path: The air intake sequence of 9 grids is: No. 5 → No. 2, 4, 6, and No. 8 → No. 1, 3, 7, and 9; determined by the process characteristics of superplastic forming / diffusion connection, the parts The starting point of forming air intake is generally at the edge of the part. Therefore, the starting point of forming the air intake of this part is set at the center of the lower edge of ...

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Abstract

The invention relates to a forming method of a superplastic forming/diffusion connecting four-layer structure of a grid with variable depth-width ratio, and belongs to the technical field of surface wrinkle prevention, and the surface of the four-layer structure formed by virtue of the method is flat and winkle-free. According to the method, in the process of forming a core board into a grid, the grids with different depth-width ratios are different in expanding start time, i.e., the grid with higher depth-width ratio is formed before the grid with lower depth-width ratio, and the grids with approximate depth-width ratios are approximate in expanding start time, so that the contact start time of each grid and a panel at the position of the grid is approximate; meanwhile, in the grid forming process, the air pressure between the panel and the core board is always kept high, so that the part, which is contacted with the panel, of the grid is not subjected to diffusion connection immediately in the expanding process; due to the effects of two aspects, the problem that the panel draws back along with deformation of the core board in a grid continuous expanding process can be prevented, and thus wrinkles are prevented from occurring.

Description

technical field [0001] The invention relates to a forming method of a superplastic forming / diffusion connection four-layer structure with variable aspect ratio grids. The surface of the four-layer structure formed by the method is smooth and wrinkle-free, and belongs to the technical field of surface wrinkle prevention. Background technique [0002] The superplastic forming / diffusion bonding process is usually applied to the forming of sheet metal. This process can be used to form four-layer thin-walled mesh parts. This structure has the advantages of thin wall and light weight, and can be applied to the manufacture of aerospace vehicle rudders Manufacture of wing parts to meet the weight reduction requirements of the structure. [0003] The process is achieved by superplastic forming and local diffusion joining of four-layer sheet metal blanks using air pressure in the part mold cavity at high temperature. Among the four-layer sheets, the outer one is the panel, which fina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/021B21D26/027
Inventor 高鹏阴中炜微石张绪虎石刚任秀峰
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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