High-precision aluminum alloy rectangular tube forming method

A rectangular tube and aluminum alloy technology, which is applied in the field of forming high-precision aluminum alloy rectangular tubes, can solve problems such as tube blank breaking and corner transverse cracks, and achieve the effects of eliminating transverse cracks, compact structure, and excellent mechanical properties

Inactive Publication Date: 2011-09-07
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a forming method of aluminum alloy rectangular pipe, which can effectively improve the dimensional accuracy and surface quality of the finished pipe, improve the service performance and life of the product, and solve the During the process, the tube billet is broken, and there are obvious transverse cracks at the corners

Method used

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  • High-precision aluminum alloy rectangular tube forming method
  • High-precision aluminum alloy rectangular tube forming method
  • High-precision aluminum alloy rectangular tube forming method

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Embodiment

[0034] In this embodiment, an aluminum alloy tube with a height H and a width B ratio of 1:2.0, a size of 90.12mm×45.16mm×2.06mm, and an inner surface roughness of Ra1.0 as an example, proposes a method for manufacturing this type of rectangular tube The specific implementation steps are as follows:

[0035] a) Heat the prepared aluminum alloy ingot with the grade of 6061 to 415±5℃ for 1-2h. The purpose of the ingot homogenization treatment is to eliminate the residual stress formed inside the metal after the end of the metal casting, improve the plastic processing ability of the metal ingot, improve the structure and mechanical properties of the product, and prepare for the subsequent further processing. In actual production, most aluminum alloy ingots must be homogenized before pressure processing.

[0036] b) First, preheat the extrusion split die to 400°C, then put the aluminum alloy ingot with a heating temperature of 450°C into the extrusion barrel of the die, and the extrus...

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Abstract

The invention discloses a high-precision aluminum alloy rectangular tube forming method which comprises the following steps: a) heating the prepared No.6061 aluminum alloy ingot over uniform fire to 415+/-5 DEG C, and keeping for 1-2 hours; b) performing hot extrusion on an extrusion shunting mould with a preheating temperature of 400 DEG C to obtain an initial tube blank; c) performing annealingtreatment in salt bath; d) performing cold rolling on the tube blank obtained in the step c) to obtain a round tube; e) soaking the round tube obtained in the step d) in a 38# cylinder oil for 24 hours; f) performing non-mandrel drawing on the tube blank obtained in the step e) to obtain an approximately rectangular tube; g) performing mandrel drawing on the approximately rectangular tube obtained in the step f) through a rectangular correction mould to obtain a rectangular tube; and h) performing mandrel drawing of the rectangular tube obtained in the step g) to obtain the finished tube. Through the invention, the size precision and surface quality of the finished tube are improved, the problems that the tube blank is drawn apart in the drawing process and obvious transverse cracks appear at the corner are solved, and the operational performance and service life of the product are remarkably improved.

Description

Technical field [0001] The invention belongs to the technical field of metal material processing, and particularly relates to a method for forming a high-precision aluminum alloy rectangular tube. Background technique [0002] As an important component of radio and microwave communication and navigation equipment, high-precision aluminum alloy rectangular tubes are widely used in important scientific and technological fields such as aviation, aerospace, radar, telemetry and long-distance communication. Due to the particularity of the work and use environment, stricter requirements are put forward for the dimensional accuracy and inner surface quality of this type of rectangular tube. At present, in actual production, the preparation of this type of pipe mainly adopts the drawing forming scheme of initial round pipe blank-transition ellipse-finished rectangle. However, due to the unreasonable deformation of the tube blank material, the consistency and uniformity of the metal part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/15B21C3/02
Inventor 徐戊矫王凯庆周杰王鹏程杨小兵朱若岭
Owner CHONGQING UNIV
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