A Method for Eliminating Surface Grooves in Superplastic Formed/Diffusion Bonded Four-Layer Structures

Abstract

The invention discloses a method for eliminating grooves formed in the surface of a superplastic forming / diffusion bonding four-layer structure. The method comprises the steps that (1), the plate thickness of the superplastic forming / diffusion bonding four-layer structure is selected; (2), air inlets for forming the superplastic forming / diffusion bonding four-layer structure are machined in selected plates; (3), the plates with the machined air inlets are welded into a whole, and air inlet pipes are welded to the air inlets; (4), the whole plate with the air inlet pipes is heated, and air is introduced into the air inlet pipes to apply back pressure after the temperature of the whole plate reaches the certain temperature till diffusion bonding of the plate is completed; and (5), air is introduced into the air inlet pipes for pressurizing, and superplastic forming of the plate is completed. According to the method, the superplastic forming / diffusion bonding four-layer structure is formed through the method of applying the back pressure, the condition that the grooves are generated in the four-layer structure in the superplastic forming / diffusion bonding process can be effectively avoided, and the superplastic forming / diffusion bonding four-layer structure prepared through the method of applying the back pressure has the significant advantages on the aspects such as the part sizeprecision, the profile precision, the surface quality, the machining efficiency and the manufacture cost.

Description

technical field [0001] The invention belongs to the field of precision sheet metal processing, and relates to a method for eliminating grooves on the surface of a superplastic forming / diffusion connection four-layer structure. Background technique [0002] The superplastic forming / diffusion joining process is a lightweight forming technology, which has the characteristics of low cost, high efficiency and nearly no margin. The formed parts have the advantages of light structure weight and good structural integrity. The further development of expensive modern aircraft has important practical implications. Superplastic forming / diffusion-bonded four-layer structure is widely used in the aerospace field. The integration and lightweight of this type of structural component products are getting higher and higher, and the manufacturing precision requirements are getting higher and higher. Surface quality, processing efficiency and Manufacturing cost requirements are also becoming m...

AI Technical Summary

Problems solved by technology

[0003] The superplastic forming / diffusion bonding four-layer structure is prone to surface groove defects during the forming process, which seriously affects the surface quality and dimensional accuracy of the superplastic forming / diffusion bonding four-layer structure, and reduces the quality of the superplastic forming / diffusion bonding four-layer structure. processing efficiency, increasing the manufacturing cost of superplastic forming / diffusion-bonded four-layer structures

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