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Production process of 2024 high-strength aluminum alloy special thin-walled section steel

A technology for aluminum alloy profiles and production processes, applied in the field of aluminum alloys, can solve the problems of difficult control of profile formability and dimensional accuracy, and unattainable production processes, and achieve the effect of optimizing the design of quenching fixtures and reducing the degree of alloying.

Inactive Publication Date: 2018-06-22
CHINA ZHONGWANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention solves the problem that the wall thickness of 2024 high-strength aluminum alloy ultra-thin-walled profiles is relatively thin, only 1.0 mm, the formability and dimensional accuracy of profiles are difficult to control, and the existing production process cannot meet the requirements of the GJB2507A standard. Provide a production process for 2024 high-strength aluminum alloy ultra-thin-walled profiles

Method used

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  • Production process of 2024 high-strength aluminum alloy special thin-walled section steel
  • Production process of 2024 high-strength aluminum alloy special thin-walled section steel

Examples

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Effect test

Embodiment 1

[0026] Such as figure 1 A 2024 high-strength aluminum alloy ultra-thin-walled profile production process is shown, including the following steps:

[0027] A. Melting and casting: The mass percentage ratio of each element in the aluminum alloy ingot raw material is as follows:

[0028] element

Si

Fe

Cu

mn

Mg

Cr

Zn

Ti

Al

content

0.05

0.10

3.9

0.40

1.30

0.10

0.20

0.12

margin

[0029] Single impurity ≤ 0.05%, total impurity ≤ 0.15%,

[0030] Put the prepared aluminum alloy raw materials into the smelting furnace and evenly mix them to melt them into liquid aluminum alloys, and melt and cast the liquid aluminum alloys into aluminum alloy casting rods;

[0031] B. Homogenization: heat the aluminum alloy casting rod obtained by melting and casting to 500°C, keep it warm for 25 hours, and cool to normal temperature to obtain a homogeneous aluminum alloy casting rod, wherein the length of the homogeniz...

Embodiment 2

[0038] The difference between embodiment 2 and embodiment 1 is that in step A, the mass percentage ratio of each element of the aluminum alloy ingot raw material is as follows:

[0039] element

Si

Fe

Cu

mn

Mg

Cr

Zn

Ti

Al

content

0.05

0.10

4.0

0.60

1.40

0.10

0.20

0.12

margin

[0040] Single impurity ≤ 0.05%, total impurity ≤ 0.15%.

[0041] The tensile strength of the 2024 high-strength aluminum alloy ultra-thin-walled profiles obtained in embodiment 1 and embodiment 2 is respectively 400MPa and 410Mpa, the yield strength is respectively 300MPa and 305Mpa, and the elongation at break is respectively 12% and 13%. GJB2507A standard requires R m ≥395MPa,R p0.2 ≥290MPa, A%≥10%. The dimensions of the ultra-thin-walled 2024 high-strength aluminum alloy profiles obtained in Example 1 and Example 2 meet the requirements of GB / T14864 high-precision grades, with plane gaps of ≤0.2mm, angles of 90±2°, an...

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Abstract

The invention belongs to the technical field of aluminum alloys, and relates to a production process of a 2024 high-strength aluminum alloy special thin-walled section steel. flat mold form with fourextrusion holes and no flow guide pit in design aspect of a mold, an extrusion ratio of the whole section steel is reduced to 40, a 6.6MN non-standard extrusion machine is selected in the aspect of extrusion machining, the extrusion ratio is 40.2, the section steel is stretched within 1 hour after extrusion, and an off-line quenching degree is 455 DEG C * 30 minutes, the section steel is stretchedwithin 1 hour after the off-line is carried out, and the stretching amount is controlled at the upper limit of 2.5%-to 3%. The shaping and extrusion production interval time is controlled within 3 hours, a shaping rate is improved, a novel quenching clamp is designed for the section steel, so that the deformation of the section steel is reduced to the minimum while the section steel is fully quenched, the 2024 aluminum alloy section steel is subject to a serious of machining process of mold adjusting, production equipment structure is changed, extrusion, the off-line quenching, quenching clamp manufacturing, shaping and the like, all detection indexes meet the standard requirement of GJB2507A in detection aspects of mechanical property, low-magnification, high-magnification and dimensional tolerance.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and relates to a production process of 2024 high-strength aluminum alloy ultra-thin-wall profiles. Background technique [0002] 2024 aluminum alloy is also known as high-strength duralumin. Its extruded profiles are mainly used in aircraft fuselage frames, wing stringers, wing ribs and other stressed structural parts. Among them, most of the 2024 aluminum alloy extruded corner profiles rely on imports. Only a few companies in China can produce, but there are still many problems, mainly reflected in: (1) 2024 aluminum alloy has high strength, high extrusion deformation resistance, difficult extrusion molding, and difficult to guarantee dimensional tolerance; (2) ) The profile extrusion efficiency is too low; (3) The profile deformation and resilience after vertical quenching are relatively large, which makes shaping more difficult, and the yield is as low as about 35%. [0003] 2024 high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/00C22C21/16C22C21/18C22C21/14C22C1/02C22F1/057
CPCB21C37/00C22C1/026C22C21/14C22C21/16C22C21/18C22F1/002C22F1/057
Inventor 王义斌王睿李延军苗立成董晶飞何强康铭张健刘丽瑜窦志佳董颖
Owner CHINA ZHONGWANG
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