A simple air intake device and air intake method for superplastic forming/diffusion connection

Abstract

The invention belongs to the technical field of superplastic forming and diffusion bonding of titanium alloy, and particularly relates to a simple air inlet device achieving superplastic forming and diffusion bonding and an air inlet method. A bi-directional valve is adopted for achieving switching of air inlet and air exhaust. The work process comprises the steps that in the warming process, vacuumizing is conducted on the inner layer and the outer layer simultaneously through a bi-directional valve, when the temperature rises to the set temperature, outer layer air inlet starts, and at the moment, the outer layer is subjected to superplastic forming. The inner layer continues to be vacuumized, and the inner layer achieves diffusion bonding in the vacuum state. Outer layer air inlet is completed and then switched into inner layer air inlet, a vacuum extractor is turned off, and the inner layer achieves diffusion bonding in the vacuum state. In the whole superplastic forming and diffusion bonding air inlet process, switching under vacuum is achieved through valve control, and the phenomenon that in the inner layer and outer layer air inlet switching process, materials are oxidized,and then diffusion bonding is affected is avoided.

Description

technical field [0001] The invention belongs to the technical field of superplastic forming / diffusion connection of metal materials, and in particular relates to a simple air intake device and air intake method for superplastic forming / diffusion connection of metal materials under high temperature and high pressure. Background technique [0002] Superplastic forming / diffusion bonding technology is to use the superplasticity and solid-state diffusion ability of materials at a certain temperature (usually 0.5tm) and pressure to complete the outer contour forming of components and the diffusion bonding of internal structures in one thermal cycle, so that A hollow weight-reducing structure manufacturing technology is realized. Since this hollow structure has the advantages of obvious weight reduction and high rigidity and strength, it has been widely used in aircraft and missiles as the main load-bearing structure. The most mature application field is titanium alloy superplastic...

AI Technical Summary

Problems solved by technology

Since the equipment modified by the hydraulic press does not have the conditions to be connected to the air circuit system, it needs to be disassembled and connected many times when switching between the intake air and the vacuum. During the disassembly and connection, the air sucked into the inner layer and the outer layer is easy to oxidize, which affects the process. research poses difficulties

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