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Creep aging forming method for large-curvature wallboard

A creep aging forming, large curvature technology, applied in furnace types, furnaces, heat treatment furnaces, etc., can solve the problem of reducing the corrosion resistance and fatigue resistance of wall panels, weakening the outstanding advantages of creep aging forming process, and creep aging forming. Low efficiency and other problems, to achieve the effect of increasing dislocation density and instability, eliminating stress concentration defects, and improving corrosion resistance and fatigue resistance

Active Publication Date: 2020-02-18
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this limits the creep-age-formable curvature of the panel
At present, the creep aging forming of large curvature panels usually produces a large amount of plastic deformation of the panel before creep aging, but this will inevitably lead to crack defects inside the panel, which reduces the corrosion resistance and corrosion resistance of the panel. Anti-fatigue performance, which weakens the outstanding advantages of the creep aging forming process
In addition, during creep aging forming, in order to fully disperse and precipitate the strengthening phase, the wall plate needs to be kept in a high temperature environment for a long time, resulting in very low efficiency of creep aging forming

Method used

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  • Creep aging forming method for large-curvature wallboard
  • Creep aging forming method for large-curvature wallboard
  • Creep aging forming method for large-curvature wallboard

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The wall plate material is 2024 aluminum alloy, the length of the wall plate blank is 1200mm, the width is 600mm, and the thickness is 5mm. Bending with a single curvature along the length of the wall plate, the bending radius is 300mm, and the bending angle is 45°. After calculation, the length of the siding selection area is 600mm and the width is 140mm. Using cast steel shot with a hardness of 500HV and a diameter of 400μm, with a spray speed of 500 m / s and a nozzle moving speed of 300 mm / min, press image 3 The shot peening trajectory shown in a performs shot peening on the selected area.

[0036] Put the panel in a mold with a radius of 235mm, apply a forming pressure of 300MPa in an autoclave, and keep it at a temperature of 175°C for 12h. Uninstall the pickup. Finally, use SiC sandpaper with a particle size of 400 and 600 to polish the selected area, and then use canvas to mechanically polish the selected area.

Embodiment 2

[0041] The wall plate material is 2024 aluminum alloy, the length of the wall plate blank is 1200mm, the width is 600mm, and the thickness is 5mm. Multi-curvature bending along the length of the wall plate, the bending radii along the width direction are 300mm, 400mm, 500mm respectively, and the bending angle is 45°. After calculation, the panel selection area is a trapezoid with a top edge of 140mm, a bottom edge of 240mm, and a height of 600mm. Using cast steel shot with a hardness of 500HV and a diameter of 400μm, with a spray speed of 500 m / s and a nozzle moving speed of 300 mm / min, press image 3 The shot peening trajectory shown in b performs shot peening on the selected area.

[0042] Put the wall panels in molds with radii of 235mm, 335mm, and 435mm, apply a forming pressure of 350MPa in an autoclave, and keep warm at a temperature of 175°C for 12h. Uninstall the pickup. Finally, use PH=2 sulfuric acid to etch and polish the selected area.

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Abstract

The invention discloses a creep aging forming method for a large-curvature wallboard. The method is mainly used for increasing the creep aging forming curvature of the wallboard, improving the corrosion resistance and fatigue resistance of the large-curvature wallboard, and improving the creep aging forming efficiency. The method comprises the following steps of performing solid solution on an aluminum alloy wallboard blank at 420-520 DEG C for 1-3 hours, and performing quenching; then performing shot peening strengthening treatment on a selected area of the wallboard; then performing creep aging on the wallboard in a hot pressing tank; and finally, performing polishing treatment on the selected area of the wallboard. According to the method, the generation of microcracks during creep aging forming of the large-curvature wallboard can be effectively avoided, the precipitation efficiency of reinforced phases is promoted, the corrosion resistance and fatigue resistance of the wallboard are enhanced, the creep aging forming curvature of the wallboard is increased, and the application range of the creep aging forming process is improved.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing technology, and in particular relates to a creep aging forming method of a large curvature wall plate. Background technique [0002] Creep aging forming technology is a process that combines aging strengthening and creep forming, and uses the high temperature creep characteristics of metals for forming. It has broad application prospects in the field of aerospace wallboard production. The typical aging forming process is divided into three stages, (1) Loading: At room temperature, the metal parts are elastically deformed by a certain loading method, and fixed on the tooling with a certain shape. (2) Artificial aging: Put the parts and tooling into the heating furnace together, and keep them warm for a period of time in a specific high-temperature environment. During this process, the material is affected by creep, stress relaxation and aging mechanisms, and the internal structure and propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D31/00C21D9/00C22F1/04
CPCB22D31/00C21D9/0081C22F1/04Y02P10/20
Inventor 马振武曹自洋殷振
Owner SUZHOU UNIV OF SCI & TECH
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