Technology for reducing residual stress of complex aviation die forging through adopting local die pressing method

Abstract

The invention discloses a technology for reducing residual stress of a complex aviation die forging through adopting a local die pressing method. According to the technology, a load is applied to a forging (4) by adopting a die structure consisting of an upper die (1) and a lower die (5) at normal temperature, wherein the upper die (1) and the lower die (5) are used for carrying out die pressing on the quenching residual stress concentration area where a rib plate and a web plate of the forging (4) are crossed, and the die pressing is not applied to the upper half part of the rib plate of the forging (4), so that the forging (4) can be smoothly demoulded after a die pressing cold deformation technology. The die and an insert are combined to form a locally cold-deformed force-applying profile; and the locally die-pressed stress profile is formed on the surface of the forging. The technology for reducing residual stress of the complex aviation die forging through adopting the local die pressing method is applicable to reducing the quenching residual stress of complex aviation high-strength structure type parts, and has a good reduction effect and low requirement on the equipment load capacity, and is easy to demould.

Description

technical field [0001] The invention relates to a process for reducing residual stress by partial molding of complex aviation die forgings, and is especially used for reducing residual stress of quenching of complex aviation high-strength structural parts. Background technique [0002] Ultra-high-strength aluminum alloy has the advantages of high specific strength, strong corrosion resistance, and good ductility. The proportion of materials in aerospace vehicles has reached more than 80%. Ultra-high-strength aluminum alloy components need to be quenched to improve their strength and toughness. Strength, fatigue resistance and other comprehensive mechanical properties, but quenching residual stress can cause deformation or even cracking of components, which has become one of the major problems facing production research. [0003] There are many methods for quenching residual stress reduction. At present, the quenching residual stress reduction method that can be used for larg...

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Problems solved by technology

[0002] Ultra-high-strength aluminum alloy has the advantages of high specific strength, strong corrosion resistance, and good ductility. The proportion of materials in aerospace vehicles has reached more than 80%. Ultra-high-strength aluminum alloy components need to be quenched to improve their strength and toughness. Strength, fatigue resistance and other comprehensive mechanical properties, but quenching residual stress can cause deformation or even cracking of components, which has become one of the major problems facing production research

[0003] There are many methods for quenching residual stress reduction. At present, the quenching residual stress reduction method that can be used for large-scale complex ultra-high-strength aluminum alloy aerospace structural parts is aging or cryogenic treatment, but only 10%-40% of residual stress can be reduced. Satisfying large aeronautical components with complex shape and structure, large quality and size, and high requirements for component use

The traditional production method of machining parts with pre-stretched large and thick plates will cut off the material streamline and cause processing deformation, which can no longer meet the production requirements of high-rib, thin-walled, and large-sized key load-bearing components of modern aviation.

Isothermal die forging makes the material flow and form at high temperature and low speed, which can improve the structure and performance and increase the similarity between the blank and the component, but the stretching method is not suitable for die forgings with complex shapes and structures

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