Diffusion connection mold and diffusion connection method

Abstract

The invention relates to a diffusion connection mold and a diffusion connection method, belonging to the technical field of precision sheet metal processing, and solves the current problems of high-temperature sagging deformation, low welding rate and low efficiency of large-area diffusion connection of multi-layer boards. Diffusion connection mold includes an upper mold and a lower mold matched with the upper mold. The upper mold is provided with a first sealing stem, an air cavity and an air channel for filling the air cavity with high-pressure flexible gas; the lower mold is a flat plate structure. There is a second sealing stem and a vacuum airway. The diffusion bonding method is as follows: making large-area diffusion bonding blanks for multilayer boards; performing surface treatment on large-area diffusion bonding blanks for multilayer boards; making release agent patterns for large-area diffusion bonding blanks for multilayer boards; assembling large-area diffusion bonding blanks for multilayer boards , peripheral fusion welding and vacuum tube welding to obtain multilayer board seals; diffusion bonded multilayer board seals. The invention can be used for large-area diffusion connection of multilayer boards.

Description

technical field [0001] The invention relates to the technical field of precision sheet metal processing, in particular to a diffusion connection mold and a diffusion connection method. Background technique [0002] The superplastic forming / diffusion joining process of parts is an advanced lightweight forming method, which can process and manufacture hollow multi-layer structures. The components produced by it have been widely used in aerospace, weaponry and other fields. Usually, the diffusion connection of multi-layer plates is completed before the superplastic forming of the parts, so the strength requirements for the diffusion connection joints between the layers are relatively high. Smaller size slabs are easier to ensure the diffusion welding rate during diffusion bonding; however, when the slab size is larger and the diffusion bonding area is larger, the diffusion bonding rate is difficult to guarantee, and there will be deformation problems such as high temperature sa...

AI Technical Summary

Problems solved by technology

For the large-area diffusion connection process of large-sized parts, the existing two main technical methods have shortcomings: First, the rigid diffusion connection method requires high flatness of the coupling surface of the upper mold and the lower mold, so the mold processing is difficult , high cost; in addition, it is difficult to achieve a high diffusion welding rate due to problems such as mold processing accuracy or mold deformation

Second, although the air pressure diffusion connection can ensure the diffusion welding rate, the plate is easy to sag and deform due to its own gravity at high temperature, which affects the quality and pass rate of the final parts

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