Method for preparing three-layer hollow component through superplastic forming/diffusion connection

Abstract

The invention provides a method for preparing a three-layer hollow component through superplastic forming / diffusion connection. In the process that the three-layer hollow component is prepared throughthe superplastic forming / diffusion connection technology, forming is conducted by combining a hard sheath technological design method and a temperature change process control method. Aiming at the three-layer hollow component, combining of the hard sheath technological design method and the temperature change process control method is put forward, and forming of surface grooves in the forming process of the three-layer hollow component is reduced. According to main improvement points, a hard sheath forming method is adopted, a hard sheath keeps in contact with a face plate all the time in theforming process, under the high-temperature condition, enough surface friction force is provided, the deformation speed of the face plate is coordinated, and thus tensile stress to the face plate inthe inner reinforcing rib forming process is not enough to enable the face plate to deform. Additionally, in the forming process, through temperature change control, control over the forming speed isachieved, forming of the surface grooves of a formed part can be effectively reduced, the design range of the three-layer hollow component is extended, the milling work procedure is reduced, and the material utilization rate is increased.

Description

technical field [0001] The invention relates to the technical field of hollow member manufacture, in particular to a method for preparing a superplastic forming / diffusion connection three-layer hollow member. Background technique [0002] Superplastic Forming and Diffusion Bonding (SPF / DB) technology is a nearly no-stock forming technology that combines superplastic forming and diffusion bonding. Design and manufacturing had a major impact. The overall structural parts of the aircraft manufactured by SPF / DB technology can not only meet the design requirements, such as light weight and high rigidity; but also meet the technical requirements, simplify the manufacturing process of parts and components, shorten the manufacturing cycle, Reduce the amount of manual labor and reduce costs. SPF / DB hollow structural parts have shown great advantages in reducing the mass of aircraft and reducing production costs, and are widely used in aircraft, aero-engines, missiles, spacecraft an...

AI Technical Summary

Problems solved by technology

Compared with single-layer, two-layer and four-layer structures, the application of three-layer structure is less. The main reason is that the three-layer structure is easy to produce surface grooves. In the prior art, the thickness of the panel is increased to complete the forming and then the excess thickness of the panel is removed. Meet design requirements, which leads to waste of materials and increased processes

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