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Age hardenable aluminum alloy integral panel one-step forming method based on autoclave

A forming method and the technology of integral wall panels are applied in the field of one-time forming of aging-strengthened aluminum alloy integral wall panels. Creep aging one-time molding and other issues to achieve the effect of reducing height, eliminating internal stress differences, and reducing the final springback

Active Publication Date: 2014-04-02
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this lower forming stress also limits the forming ability of this method, and the creep amount is generally less than 1% under the commonly used aging system for aluminum alloys.
However, the actual aerospace integral panel components, such as wing panels, aircraft doors and other integral panel components, often have complex variable curvature surfaces or large curvature shapes, and it is difficult for these components to be formed at one time by creep aging. Weaken the advantages of creep aging technology in terms of production cost and cycle time
In addition, there have been many literature reports pointing out that different creep stress or mold surface will affect the material properties of creep aging formed parts
This leads to uneven performance of components with large curvature changes after creep aging forming, which affects the service life of components
It can be seen that the shortcomings of the above-mentioned creep aging forming in terms of component shape and performance need to be improved urgently, otherwise it will be difficult to break through the development bottleneck of creep forming manufacturing of integral wall panels

Method used

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  • Age hardenable aluminum alloy integral panel one-step forming method based on autoclave
  • Age hardenable aluminum alloy integral panel one-step forming method based on autoclave
  • Age hardenable aluminum alloy integral panel one-step forming method based on autoclave

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The siding material is 7050 aluminum alloy, the length of the slab is 850mm, the width is 240mm, and the thickness is 10mm. The target shape surface is continuously distributed along the length direction of the siding with a bending radius of 1000 mm to 15000 mm, showing a streamlined shape, and adopts the T6 aging system. After solid solution at 470°C for 120 minutes and water quenching, the slab is fixed on the forming mold, covered with a vacuum film to form a vacuum-closed forming tool, and then placed in an autoclave. Among them, the mold surface includes a large curvature range: R / t=600 / 10~0.51×(70.3×10 3 / 360) / 10, small curvature range: R / t=0.51×(73.8×10 3 / 320) / 10~15000 / 10, middle curvature range: R / t=0.51×(70.3×10 3 / 360) / 10~0.51×(73.8×10 3 / 320) / 10. Provide a temperature of 120°C and a pressure of 4 Bar in the autoclave to make the slab fit the mold. At this time, the material reaches the yield limit at the part with large curvature and undergoes plastic d...

Embodiment 2

[0024] The siding material is 2124 aluminum alloy, the length of the slab is 1800mm, the width is 900mm, and the thickness is 8mm. The target shape along the length direction of the siding is an ellipse with long and short semi-axes of 378 mm and 126 mm respectively, straight and straight in the width direction without bending, and adopts the T6 aging system. After solid solution at 490°C for 120 minutes and water quenching, the slab is fixed on the forming mold, covered with a vacuum film to form a vacuum-closed forming tool, and then placed in an autoclave. Among them, the mold surface includes a large curvature range: R / t=400 / 8~0.43×(72×10 3 / 330) / 8, small curvature range: R / t=0.43×(74×10 3 / 300) / 8~1200 / 8, middle curvature range: R / t=0.43×(72×10 3 / 330) / 8~0.43×(74×10 3 / 300) / 8. Provide a temperature of 190°C and a pressure of 8 Bar in the autoclave to make the slab fit the mold. At this time, the material at the large curvature parts at both ends of the ellipse reaches ...

Embodiment 3

[0026]The siding material is 7475 aluminum alloy, the length of the slab is 1200mm, and the width is 600mm. The thickness of the web is 2mm, and ribs with a height of 18mm and a thickness of 3mm are provided on one side of the web. The ribs have a rectangular cross-section and are distributed in a grid. There are 16 cells in total, and the size of each cell is 300mm×150mm. The target shape along the width direction of the siding has a single curvature radius of 750 mm, and adopts the T76 aging system. After solid solution at 470°C for 90 minutes and water quenching, the slab is fixed on the forming mold, covered with a vacuum film to form a vacuum-closed forming tool, and then placed in an autoclave. Among them, the mold radius is 650mm, which belongs to the middle curvature range: R / t=0.15×(70×10 3 / 380) / 20~0.15×(73×10 3 / 310) / 20. A temperature of 120° C. and a pressure of 5 Bar are provided in the autoclave to make the slab adhere to the mold, and at this time, partial p...

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Abstract

The invention discloses an age hardenable aluminum alloy integral panel one-step forming method based on an autoclave. The method includes the steps: firstly, fixing an aluminum alloy plate blank on a forming die, and placing the aluminum alloy plate blank into the autoclave after the aluminum alloy plate blank and the forming die are sealed in a vacuum manner; secondly, providing temperature needed by aluminum alloy aging and pressure needed by component laminating inside the autoclave, and enabling heavy-curvature portion materials to reach yield limit and enter a creep aging stage by keeping a laminating state after plastic deformation. Internal stress distribution is adjusted by local plastic deformation, so that the problem of non-uniform performance caused by internal stress difference in the creep aging process can be eliminated, production cycle and rebound are decreased by combining plastic deformation with creep deformation, and the height of the die can be decreased. The process method can be implemented in the autoclave with enough capacity, the highest working pressure is not lower than 10Bar, and the using temperature can range from 100 DEG C to 200 DEG C. The method is simple and convenient to operate, can be implemented only by one set of female die and has an actual industrial production application value, a tool is simple, and cost is saved.

Description

technical field [0001] The present invention relates to the technical field of non-ferrous metal material processing engineering, in particular to an aging-strengthenable aluminum alloy panel member based on autoclave, which is suitable for manufacturing aging-strengthable aluminum alloy panel members with large curvature shape or complex variable-curvature surface One-time forming method of integral wall panel. Background technique [0002] Integral structural siding is widely used in manufacturing industries such as aerospace and transportation due to its advantages of reducing weight, reducing production costs and assembly workload. Creep aging forming is a manufacturing method developed for such large integral wall panels. It combines the characteristics of metal creep and aging strengthening of aluminum alloys, and uses aging temperature for creep deformation. It is safe, repeatable and It can realize one-time molding of wall panel parts. Creep aging forming has a low...

Claims

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Application Information

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IPC IPC(8): B21D26/031C22F1/04
Inventor 邓运来吴波蒋裕张劲王洋郭晓斌李红萍张新明
Owner CENT SOUTH UNIV
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