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Preparation method of curved web surface titanium alloy superplastic forming-diffusion bonding blank

A superplastic forming and diffusion joining technology, applied in welding equipment, metal processing equipment, forming tools, etc., can solve the problems of difficulty in ensuring the accuracy of parts unfolding, scrapping, and difficult to meet the requirements of high-precision coating of solder resist.

Inactive Publication Date: 2021-09-03
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when forming parts with curved web surface from "flat" to "curved", the material flow and deformation are complicated, and it is difficult to guarantee the precision of part development, and it is difficult to meet the requirements of high-precision coating of solder stop flux
Unsatisfactory blank preparation will lead to large differences between the superplastic forming area and diffusion connection area of ​​the formed part and the theoretical state of the product, resulting in out-of-tolerance or even scrapped parts

Method used

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  • Preparation method of curved web surface titanium alloy superplastic forming-diffusion bonding blank
  • Preparation method of curved web surface titanium alloy superplastic forming-diffusion bonding blank
  • Preparation method of curved web surface titanium alloy superplastic forming-diffusion bonding blank

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Embodiment 1

[0052] In this embodiment, the invention solution is described in detail by taking the superplastic forming / diffusion connector of the titanium alloy double-layer plate structure as an example. Titanium alloy parts in this invention scheme, such as image 3 shown, consisting of two layers of curved panels (constructed as Figure 4 , Figure 5 As shown, the curved web surface of sheet Ⅰ is set as a continuous superplastic forming area, and the rest of the area is a diffusion connection area, and the curved web surface of sheet Ⅱ is coordinated with the curved web surface of sheet Ⅰ. During forming, the bonded areas of sheet I and sheet II are bonded together under high temperature and pressure, and the non-laminated surface is attached to the surface of the superplastic forming / diffusion bonding mold under air pressure. The non-fitting area needs to be coated with solder stop flux to prevent the area from being diffused and bonded together during forming.

[0053] 1) Process...

Embodiment 2

[0075] In this embodiment, the titanium alloy multilayer plate structure is taken as an example to prepare the blank. The specific process is as follows: Figure 12 As shown, the preparation method of the multi-layer board blank:

[0076] For superplastic forming / diffusion joints of titanium alloy multilayer plate structure, the solder stop flux coating method is similar to that of superplastic forming / diffusion joints of double layer plate structure. There are (n-1) places on the bonding surface of the n-layer blank, and one set of hot pressing die pre-forming and (n-1) sets of scribing templates are required for solder stop flux coating on the bonding surface. The billet preparation process is as follows:

[0077] S1 The required titanium alloy n-layer flat blanks are hot-pressed separately to form the curved surface shape of the margin surface shown in the process model, and the parts are cleaned after forming.

[0078] S2 Adhesive film is integrally coated on the side of...

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Abstract

The invention discloses a preparation method of a curved web surface titanium alloy superplastic forming-diffusion bonding blank. The blank is a titanium alloy plate containing n layers, and n is larger than or equal to 2. The preparation method comprises the following steps that S1, a process model of a formed part is designed; S2, a forming device for preparing a blank is prepared according to the process model for designing the formed part; and S3, an overall blank is prepared through the forming device for preparing the blank, and the upper surface and the lower surface of the overall blank are evenly coated with welding stopping agents. According to the method, the shapes of the web faces of parts are formed through a pre-forming hot-pressing die, the bonding faces between blanks are coated with the welding stopping agents, a welding stopping agent coating area does not participate in material flowing before follow-up superplastic forming / diffusion bonding forming, the welding stopping agent coating precision is improved, a lineation sample plate is only used for lineation and does not directly participate in welding stopping agent coating, the abrasion of the sample plate is small, in addition, operation is convenient, the requirement for high-quality forming of parts is met, and the method is suitable for wide application and popularization.

Description

technical field [0001] The invention relates to the technical field of titanium alloy superplastic forming / diffusion bonding, in particular to a method for preparing a curved web surface titanium alloy superplastic forming-diffusion bonding blank. Background technique [0002] The titanium alloy superplastic forming / diffusion bonding process can be used to manufacture multi-layer hollow structures with complex shape surfaces and reinforced inner ribs. Compared with parts manufactured by traditional manufacturing processes, this process has the advantages of light structure, good integrity and high quality. It greatly improves the design freedom and structural efficiency of components, and has been widely used in aviation and aerospace fields. [0003] Superplastic forming / diffusion bonding parts are multilayer sheet metal structures. When preparing blanks, in addition to coating solder stopper (or release agent) on the upper and lower surfaces that contact the ultra-fast fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/18B23K20/24B23K20/26B21D37/10
CPCB23K20/023B23K20/18B23K20/24B23K20/26B21D37/10
Inventor 任广义王宇盛王晓康王高明王建国王军
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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