Mechanically-machining rib/diffusion connecting process for titanium alloy rudders and wing members

Abstract

The invention discloses a mechanically-machining rib / diffusion connecting process for titanium alloy rudders and wing members, which comprises the following steps of: 1, mechanically machining the rudders, the wing members and the ribs according to drawings; 2, performing acid washing; 3, folding the two halves of mechanically-machined rudders, the two halves of mechanically-machined wing members and the two halves of mechanically-machined ribs and welding the peripheries and a ventilation pipe; 4, mold-filling, namely, placing the rudders and the wing members coated with a parting agent in the centre of a cavity of superplastic forming equipment; 5, raising the temperature and introducing a protective gas; 6, forming, namely, (1) introducing one liter of gas with a pressure equal to 3 barometric pressures into the cavity of the parts for 5 minutes, (2) introducing one liter of gas with the pressure equal to 3 barometric pressures into the cavity of the parts for 60 minutes and (3) introducing one liter of gas with the pressure equal to 1.2 barometric pressures into the cavity of the parts for 5 minutes; 7, reducing the temperature and performing stripping; and 8, milling the external forms of the rudders and the wing members. The process has the advantages of high forming success rate, stable member quality, accurate rib position, stable gravity center position and short forming time which is only 1 to 2 hours.

Description

Technical field: [0001] The invention is a process for machining ribs / diffusion connection of titanium alloy rudder and wing components. Background technique: [0002] In aviation and spacecraft, the rudder and wing components are often processed by four-layer titanium alloy sheet through superplastic forming / diffusion bonding process. The titanium alloy four-layer superplastic forming / diffusion bonding process is: the forming temperature refers to the temperature of the forming mold 910 ℃ ~ 950 ℃, input argon gas in the two forming gas channels, and at the same time vacuumize the two layers in the middle, so that the two layers of uncoated release agent can be diffused together. After maintaining a certain pressure and a certain time in the forming equipment, Argon gas is input into the middle layer, and the air pressure of the outer two layers gradually decreases. This process realizes the plastic forming of the middle two layers and the diffusion connection with the outer...

AI Technical Summary

Problems solved by technology

Its disadvantages are: 1. During the superplastic forming / diffusion welding four-layer structure, during the diffusion process of the inner superplastic outer layer, it is easy to have triangular defects, which makes the surface of the parts easy to groove, resulting in the scrapping of the parts

2. When superplastic forming / diffusion welding vertical bars, there are gaps locally, and there is no diffusion welding, which reduces the bearing capacity of vertical bars

3. The thinner the formed part and the larger the forming area of ​​the part, the poorer the formability of titanium alloy superplastic forming / diffusion welding four-layer structure parts

4. The ribs formed by superplastic are easy to deviate, making the position of the internal structure inaccurate, easily affecting the strength of the structure, and greatly affecting the center of gravity of the structure

5. The entire manufacturing period is relatively long, and the thermoforming time is long, which takes 6 to 9 hours

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