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Production method of al-zn-mg aluminum alloy hollow profile for high-speed train

A technology for high-speed motor vehicles and hollow profiles, which is applied in the field of aluminum alloy production and manufacturing, can solve the problems that the stability and balance of mechanical properties of profiles cannot fully meet product requirements, large mold loss, uneven hand feeling, etc., and reduce the risk of damage to equipment , improve life and save mold cost

Active Publication Date: 2020-03-13
广西南南铝加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The reference document is the applicant's existing preparation process of Al-Zn-Mg alloy profiles for high-speed EMU car bodies. It is found in actual production that the molds used in this production method have a lot of loss, low throughput, frequent mold repairs, and The surface of the produced profiles has defects such as aluminum drawing and concave-convex feel; and the stability and balance of the mechanical properties of the profiles cannot fully meet the product requirements

Method used

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  • Production method of al-zn-mg aluminum alloy hollow profile for high-speed train
  • Production method of al-zn-mg aluminum alloy hollow profile for high-speed train
  • Production method of al-zn-mg aluminum alloy hollow profile for high-speed train

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Effect test

Embodiment 1

[0030] The production method of Al-Zn-Mg aluminum alloy hollow profile for high-speed motor vehicle, the weight percent of described Al-Zn-Mg aluminum alloy composition is: Mg: 0.9%, Zn: 3.0%, Si: 0.1%, Fe: 0.1% , Mn: 0.05%, Zr: 0.05%, Cr: 0.04%, Cu: 0.05%, Ti: 0.01%, V: 0.01%, and the rest is Al.

[0031] Production includes the following steps:

[0032] a. Extrusion: The length of extrusion casting ingot is 700mm, and the gradient heating method is adopted to make the temperature difference between the head and the tail is 2°C, and the heating temperature of the ingot in the heating furnace is controlled at 400°C; Mg-Si alloy ingot casting dummy ingot, the weight percentage of dummy ingot casting alloy composition is: Mg: 0.7%, Si: 0.8%, Fe: 0.1%, Mn: 0.05%, Cr: 0.05%, Zn: 0.05%, Cu≤0.1%, Ti≤0.1%, V≤0.05%, and the rest is Al; the total content of Mg+Zn elements in subsequent extrusion ingots is 2.6 times the total content of Mg+Si elements in dummy ingots; subsequent extrus...

Embodiment 2

[0040] A method for producing Al-Zn-Mg aluminum alloy hollow profiles for high-speed motor vehicles, the weight percentages of the Al-Zn-Mg aluminum alloy components are: Mg: 2.16%, Zn: 6.0%, Si: 0.4%, Fe: 0.5% , Mn: 0.4%, Zr: 0.2%, Cr: 0.28%, Cu: 0.20%, Ti: 0.05%, V: 0.03%, and the rest is Al.

[0041] Production includes the following steps:

[0042] a. Extrusion: The length of extrusion casting ingot is 1800mm, and the temperature difference between the head and the tail is 60°C by gradient heating method, and the heating temperature of the ingot in the heating furnace is controlled at 510°C; Mg-Si alloy ingot casting dummy ingot, the weight percentage of dummy ingot casting ingot alloy composition is: Mg: 0.9%, Si: 0.8%, Fe: 0.5%, Mn: 0.25%, Cr: 0.15%, Zn: 0.20%, Cu: 0.1%, Ti: 0.1%, V: 0.05%, and the rest is Al; and the total content of Mg+Zn elements in subsequent extrusion ingots is 4.8 times the total content of Mg+Si elements in dummy ingots; subsequent extrusion ingots...

Embodiment 3

[0050] A method for producing Al-Zn-Mg aluminum alloy hollow profiles for high-speed motor vehicles, the weight percentages of the Al-Zn-Mg aluminum alloy components are: Mg: 1.44%, Zn: 2.4%, Si: 0.25%, Fe: 0.3% , Mn≤0.23%, Zr≤0.20%, Cr≤0.20%, Cu≤0.20%, Ti≤0.05% and V≤0.03%, and the rest is Al.

[0051] Production includes the following steps:

[0052] a. Extrusion: The length of the extruded ingot is 1000mm, and the gradient heating method is used to make the temperature difference between the head and the tail is 20°C, and the heating temperature of the ingot in the heating furnace is controlled at 490°C; the first dummy ingot is made of Al- Mg-Si alloy ingot casting dummy ingot, the weight percentage of dummy ingot casting ingot alloy composition is: Mg: 0.6%, Si: 0.6%, Fe: 0.4%, Mn: 0.2%, Cr: 0.15%, Zn: 0.10%, Cu: 0.05%, Ti: 0.06%, V: 0.03%, and the rest is Al; the total content of Mg+Zn elements in subsequent extrusion ingots is 3.2 times the total content of Mg+Si eleme...

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Abstract

The invention discloses a production method of an aluminium alloy hollow profile for a high-speed train. The production method comprises the production steps of soft alloy dummy ingot extrusion, roller-hearth continuous solid solution quenching, stretch straightening, finished product sawing, sampling, gauging, framing, three-step integral aging furnace aging, performance testing and packaging andstorage. The production method is aimed at the problems that extrusion molding of the Al-Zn-Mg aluminium alloy profile for the high-speed train is difficult and the service life of a mold is too short, an Al-Mg-Si soft alloy is adopted as a dummy ingot to tract extrusion of an Al-Zn-Mg aluminium alloy ingot, formability of a hard alloy is greatly improved, the cracking and deformation tendency ofthe mold is greatly reduced, surface quality of the produced profile is improved, and application principles and methods of soft alloy extrusion are explored and summarized; and the produced profilehas good mechanical properties, stability of mechanical properties, elongation and surface roughness are greatly improved, the service life of the mold is remarkably prolonged, mold cost is reduced, the mold repairing time is decreased, production efficiency is greatly improved, and energy conservation and environment protection are achieved.

Description

technical field [0001] The invention relates to an aluminum alloy production and manufacturing method, in particular to a production method for Al-Zn-Mg aluminum alloy hollow profiles for high-speed trains. Background technique [0002] Al-Zn-Mg aluminum alloy is a high-strength aluminum alloy with excellent welding performance, and is often used in load-bearing structural components of high-speed railway rail vehicles. It is used as a structural profile for high-speed rail car bodies, which not only greatly reduces the weight of the car, effectively saves energy, but also ensures the strength of the car body structure, and has good fatigue resistance and corrosion resistance. Therefore, the production process of Al-Zn-Mg aluminum alloy has also become an important research object of scholars in the industry. [0003] At present, the Al-Zn-Mg aluminum alloy hollow profiles for high-speed railway vehicles in industrial production are processed by hot extrusion. After the alu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22F1/053B21C37/00
CPCB21C37/00C22C21/10C22F1/002C22F1/053
Inventor 莫宇飞向晶周伟苏智琦周文标覃珊
Owner 广西南南铝加工有限公司
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