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

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...

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 skeleton are prone to deformation during the welding and riveting process, making it difficult to guarantee the accuracy of the external dimensions of the components. , poor integrity and other shortcomings

However, the traditional SPF / DB forming process can only form flat multi-layer structures, and cannot realize the forming of some rotary sandwich structures such as cylinders.

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