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Aluminum alloy extruded material for electro-magnetic forming

An electromagnetic forming and extruding material technology, which is applied in transportation, packaging, thin material processing, etc., can solve the problems of high pipe expansion rate, easy necking, and cracks, etc., to reduce tissue differences and excellent pipe expansion formability effect

Active Publication Date: 2013-08-21
APPLE INC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In addition, when a flange is formed at the end of the extruded material (see FIG. 4(a) of JP-A-2007-254833), if the tube expansion rate is high, fan-shaped cracks in the radial direction will occur on the flange ( Cracks), or even if no cracks occur, necking (local thinning) is easy to occur
For example, when forming a flange for mounting where bolt holes can be formed, a high pipe expansion rate of more than 40% is usually required, and cracks are prone to occur

Method used

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Embodiment Construction

[0019] Next, the alloy composition, crystal structure, and the like of the 7000-series aluminum alloy hollow extruded material of the present invention will be described more specifically.

[0020] [alloy composition]

[0021] Zn: 3.0 to 8.0% by mass

[0022] Zn together with Mg forms MgZn as an intermetallic compound 2 , is an element that increases the strength of the 7000-series aluminum alloy. If the Zn content is less than 3.0% by mass, sufficient strength cannot be obtained, and if it exceeds 8.0% by mass, the strength is too high, and a practical-level pipe expansion rate cannot be obtained under the electromagnetic force of the current electromagnetic forming coil. The Zn content is preferably 4.0 to 7.0% by mass, more preferably 4.5 to 6.5% by mass.

[0023] Mg: 0.4 to 2.0% by mass

[0024] Mg together with Zn forms MgZn as an intermetallic compound 2 , is an element that increases the strength of the 7000-series aluminum alloy. When the Mg content is less than ...

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Abstract

A 7000-series aluminum alloy hollow extruded material formed by porthole extrusion contains Zn: 3.0 to 8.0 mass %, Mg: 0.4 to 2.0 mass %, Cu: 0.05 to 2.0 mass %, Si: 0.3 mass % or less, Fe: 0.35 mass % or less, and one or more of Mn, Cr, and Zr: 0.10 mass % or less in total, with the balance being Al and unavoidable impurities. The aluminum alloy hollow extruded material has a recrystallized structure throughout the cross-section. In the case of pipe expansion by electro-magnetic forming, excellent pipe expansion formability is obtained.

Description

technical field [0001] The present invention relates to an aluminum alloy hollow extruded material for electromagnetic forming having excellent pipe expandability by electromagnetic forming. Background technique [0002] The so-called electromagnetic forming is to make the coil instantaneously flow a large current such as 10kA or more to create a strong magnetic field, and form it by the interaction of the eddy current generated on the object (conductor) placed in it and the magnetic field. The method of being formed. For example, an electromagnetic forming coil is rotated in an aluminum alloy hollow extruded material (tube) to perform electromagnetic forming, and the aluminum alloy hollow extruded material is expanded outward. [0003] Conventional coils for electromagnetic forming have low durability, and if a high electromagnetic force is generated, the coil itself will be damaged, so the electromagnetic force that can be output is limited. Therefore, as a raw material f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/04C22F1/053Y10T428/12292
Inventor 志镰隆广吉原伸二
Owner APPLE INC
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