Machining and manufacturing method of 7055 aluminum alloy complex structure part

Abstract

The invention discloses a machining and manufacturing method of a 7055 aluminum alloy complex structure part. By optimizing the structure of a rough machining part and optimizing subsequent heat treatment parameters, a stress concentration level is greatly reduced, so that deformation and cracking of the 7055 aluminum alloy part during quenching after rough machining can be effectively prevented;full process control is carried out on the heat treatment process and the machining process and parameters, the machining deformation of the complex part is effectively reduced, and the machining efficiency and the qualified rate of the part are improved.

Description

technical field [0001] The invention relates to a method for processing and manufacturing 7055 aluminum alloy parts with complex structures, and belongs to the field of nonferrous metal processing technology. Background technique [0002] Non-ferrous metal materials have been widely used in aerospace vehicles because of their light weight and good comprehensive performance, and they have played a key role in the development of large-load, high-reliability, and high-cost-effective main load-bearing structures. Although the proportion of composite materials used in aerospace vehicles is increasing year by year, the main structural materials of liquid launch vehicles are still dominated by metal materials, of which non-ferrous metal materials account for more than 90%, and aluminum alloys account for 80%. Advanced aluminum alloy is used as the main structural material of the launch vehicle to achieve structural weight reduction and improve the take-off thrust-to-weight ratio of...

AI Technical Summary

Problems solved by technology

The 7055 alloy element content is relatively high, and the 7055 aluminum alloy produced by the semi-continuous casting process has problems such as composition segregation, coarse grains, and structural defects, which restrict the engineering application of the material

Although the peak aging of 7055 alloy (T6 state) has high strength (tensile strength can reach more than 700MPa), the residual stress level of the material is high, and the stress corrosion sensitivity is high, and it is easy to crack under actual complex working conditions.

However, during the quenching process, due to the structure of the part itself and the existence of quenching stress, water cooling may cause large deformation or even cracking of the aluminum alloy parts during the quenching process and be directly scrapped

7055 alloy is more prone to cracking due to high element content and large residual stress

Parts with complex structures have high requirements for dimensional accuracy, and some dimensions are difficult to process. If the processing procedures or machining parameters are unreasonable, it will easily lead to deformation of the parts and result in scrapped products.

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