Superplastic forming (SPF)/diffusion bonding (DB) forming method of titanium alloy cylindrical four-layer structure

A technology of superplastic forming and diffusion connection, which is applied in the field of sheet metal forming, can solve the problems that the forming of rotary sandwich structural parts cannot be realized, the accuracy of the external dimension of components is difficult to guarantee, and the skin and skeleton are easy to deform, so as to achieve the freedom of structural design The effect of high strength, light structure and improved process stability

Active Publication Date: 2013-04-03
BEIJING AERONAUTICAL MFG TECH RES INST
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AI Technical Summary

Problems solved by technology

For some rotary sandwich structures such as cylinders, the traditional flat multi-layer structure SPF/DB forming process has been unable to realize
Especially for the shell sandwich structure, the traditional manufacturing method is the welding and riveting of the skin skeleton, which has a large thickness of the casting skeleton and the structure is overweight. The skin and sk

Method used

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  • Superplastic forming (SPF)/diffusion bonding (DB) forming method of titanium alloy cylindrical four-layer structure
  • Superplastic forming (SPF)/diffusion bonding (DB) forming method of titanium alloy cylindrical four-layer structure
  • Superplastic forming (SPF)/diffusion bonding (DB) forming method of titanium alloy cylindrical four-layer structure

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Experimental program
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Embodiment

[0055] 1. The TC4 titanium alloy superplastic plate is used, and the thickness of the inner and outer cylinders and the core cylinder are both 1 mm; a single cylinder is prepared, and the inner diameter of the single cylinder is shown in Table 1.

[0056] Table 1 The inner diameter distribution of each layer of bobbins

[0057] bobbin

Outer cylinder 8

first cartridge 9

Second cartridge 10

Inner cylinder 11

the inside diameter of

207mm

204mm

200mm

197mm

[0058] (1) Single cylinder preparation

[0059] (1.1) Prepare outer cylinder 8

[0060] According to the outer dimensions of the final formed part, the blanking size of the outer cylinder 8 is calculated to be 659×210mm, and the titanium alloy plate is cut according to the blanking size, and the plate material is rolled into a cylindrical shape, and the butt joint is welded by laser welding or argon arc welding to weld;

[0061] (1.2) Preparation of the first core barr...

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Abstract

The invention belongs to a sheet-metal forming technology, and relates to a superplastic forming/diffusion connection forming method of a titanium alloy cylindrical four-layer structure. By adopting a novel blank structural form and a blank production method, the requirements on coating welding stopping agent and positioning a cylinder on the four-layer structure can be met, and the formation quality and the technological stability can be improved, the difficulty and complexity of a technological tool can be reduced, the SPF/DB formation of the titanium alloy cylindrical four-layer structure can be stably and reliably realized, and the formation quality and the technological stability can be improved. The SPF/DB technological method is enlarged from the formation of a flat sandwich structure to the formation of a cylindrical rotation sandwich structure, so that the application field of the process is enlarged, and good economic and technical benefit can be realized.

Description

technical field [0001] The invention belongs to sheet metal forming technology, and relates to a superplastic forming / diffusion connection forming method of a titanium alloy tubular four-layer structure. Background technique [0002] As a typical structural form of the missile inlet and shell, the sandwich structure of the cylinder requires that the components not only meet the requirements of coaxiality, roundness and other external dimension accuracy requirements, but also need to meet special performance requirements such as light weight, high strength, sealing and heat insulation. , the manufacturing process is complicated and difficult. The traditional manufacturing method of the sandwich structure of the cylinder is welding and riveting of the skin skeleton, such as figure 1 shown. First, the titanium alloy internal skeleton 2 is formed by machining or casting, and then the skeleton 2 and the skin 1 are welded and riveted to form a whole, forming a hollow sandwich st...

Claims

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Application Information

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IPC IPC(8): B23P15/00B21D39/00B21D37/10
Inventor 许慧元邵杰韩秀全韩晓宁
Owner BEIJING AERONAUTICAL MFG TECH RES INST
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