Al-Zn-Mg-Cu series aluminum alloy plate non-isothermalefficientcreep aging forming method

Abstract

The invention discloses an Al-Zn-Mg-Cu series aluminum alloy plate non-isothermal efficient creep agingforming method. In the process of creep aging forming, a reasonable non-isothermal aging system is adopted and combined withcreep deformation to realize forming and property-formingintegral manufacture of an aluminum alloy complexcomponent. The Al-Zn-Mg-Cu series aluminum alloy plate non-isothermal efficient creep agingforming method comprises the main steps that firstly a plate is subjected to solid solution treatment, and is water-quenched immediately; after being placed at an indoor temperature for certain time, the plate is fixed and loaded on a forming mold; and the plate is heated from the indoor temperature to a highest temperature for creep aging according to a certain heating rate, then the plate is cooled down to the indoor temperature according to the same rate, and finally the plate is unloaded. Compared with a traditional creep aging forming process comprising three stages of temperature rising, temperature preserving and temperature falling, the Al-Zn-Mg-Cu series aluminum alloy plate non-isothermal efficient creep agingforming method only comprises a temperature-rising process and a temperature-falling process, and has no along-time temperature-preserving process, and total forming time is less than the time for traditional creep aging forming comprising an isothermal stage; and on the premise of ensuring a same forming effect, a production period is greatly shortened, the forming efficiency is improved, and the production cost is saved.

Description

technical field [0001] The invention relates to a non-isothermal high-efficiency creep aging forming method for an Al-Zn-Mg-Cu series aluminum alloy plate, belonging to the technical field of sheet metal forming processing. Background technique [0002] Creep aging forming is an advanced sheet metal forming technology developed to meet the requirements of aerospace for large integral panel parts. During the creep aging process, the initial elastic deformation of the workpiece is produced by loading an external force lower than the yield strength at a suitable artificial aging temperature. Then keep the temperature and external force loading, a part of the elastic deformation will gradually transform into irreversible plastic deformation, stress relaxation phenomenon will occur inside the workpiece at the same time, and aging precipitation will occur in the microstructure. After cooling and unloading, the remaining elastic deformation in the workpiece rebounds, while the pla...

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Problems solved by technology

Through the multi-stage aging system, the mechanical properties and corrosion properties of the material after creep aging are partially or comprehensively improved, but the total creep aging time is also greatly increased, which makes the production cycle longer, increases the production cost, and causes more damage. much energy consumption

At the same time, the heating and cooling stages in traditional creep aging forming are short, requiring faster heating and cooling rates, and higher requirements for temperature control equipment; Causes uneven structure and deformation, making it difficult to accurately control creep aging forming

[0004] In the traditional creep aging forming process, although the heating and cooling stages are completed in a short period of time, the deformation, microstructure evolution and mechanical properties change significantly during the heating stage.

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