Preparation process of Al-Zn-Mg alloy profile for high-speed train body

A high-speed EMU and alloy profile technology, which is applied in the field of preparation of Al-Zn-Mg alloy profiles for high-speed EMU car bodies, can solve the problems of reduced fatigue performance stability, reduced stress corrosion resistance, and large performance differences. , to achieve the effects of ensuring performance stability, improving heat treatment accuracy, and improving mechanical properties

Inactive Publication Date: 2017-08-15
广西南南铝加工有限公司
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AI Technical Summary

Problems solved by technology

At present, the heat treatment method used in the heat treatment of Al-Zn-Mg alloy profiles for high-speed EMU car bodies in industrial production is on-line quenching plus ordinary box furnace aging. The disadvantages of the existing heat treatment technology: (1) In conventional industrial production, on-line quenching The temperature accuracy is poor, the ordinary box furnace has a large amount of time-consuming furnace, and the products are stacked, which cannot guarantee the performance stability of Al-Zn-Mg profiles for high-speed EMU car bodies; (2) The traditional heat treatment process is suitable for the production of T6 products. It can obtain the highest strength of the profile, but the fine precipitates are easy to form strain concentration, which reduces the plasticity and toughness, and at the same time makes the grain boundary precipitates discontinuous, resulting in a decrease in stress corrosion resistance, thereby greatly reducing the stability of fatigue performance (3) Due to the large difference in the properties of the head, middle and tail of the Al-Zn-Mg alloy profile, even if the mechanical properties of the Al-Zn-Mg alloy profile can be guaranteed, there are also problems of unstable corrosion resistance and fatigue resistance. Unable to meet the requirements for the use of high-speed railway car bodies

Method used

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  • Preparation process of Al-Zn-Mg alloy profile for high-speed train body
  • Preparation process of Al-Zn-Mg alloy profile for high-speed train body
  • Preparation process of Al-Zn-Mg alloy profile for high-speed train body

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Experimental program
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Effect test

Embodiment 1

[0024] A preparation process for an Al-Zn-Mg alloy profile for a high-speed EMU car body, comprising the following steps:

[0025] (1) Extrusion: The mass percentage composition of each component with a length of 700mm includes: Mg: 0.8%, Zn: 3.0%, Si≤0.4%, Fe≤0.5%, Mn≤0.30%, Zr≤0.20%, Cr ≤ 0.20%, Cu ≤ 0.20%, Ti ≤ 0.05%, V ≤ 0.03%, Al-Zn-Mg alloy ingot with the balance of Al, heated in a heating furnace, Al-Zn-Mg alloy ingot is heated The heating temperature in the furnace is controlled at 400°C, and the temperature of the head of the Al-Zn-Mg alloy ingot is 2°C higher than that of the tail, and then it is extruded on the line, and the extrusion speed is controlled at 0.2m / min;

[0026] (2) Roller bottom continuous solution quenching: Put the Al-Zn-Mg alloy profile in step (1) into the roller hearth furnace, hold the temperature at 400°C, and the heat preservation accuracy is ±3°C, then perform continuous quenching, the quenching pressure 3.0bar, the quenching method is water...

Embodiment 2

[0032] A preparation process for an Al-Zn-Mg alloy profile for a high-speed EMU car body, comprising the following steps:

[0033] (1) Extrusion: The mass percentage composition of each component with a length of 1800mm includes: Mg: 2.2%, Zn: 6.0%, Si≤0.4%, Fe≤0.5%, Mn≤0.30%, Zr≤0.20%, The Al-Zn-Mg alloy ingot with Cr≤0.20% and the balance of Al is heated in a heating furnace. The heating temperature of the Al-Zn-Mg alloy ingot in the heating furnace is controlled at 510 ° C, and the Al-Zn -The temperature at the head of the Mg alloy ingot is 60°C higher than the temperature at the tail, and then it is extruded on the line, and the extrusion speed is controlled at 2.0m / min;

[0034] (2) Roller bottom continuous solution quenching: Put the Al-Zn-Mg alloy profile in step (1) into the roller hearth furnace, hold the temperature at 480°C, and the heat preservation accuracy is ±3°C, then perform continuous quenching, the quenching pressure It is 6.0bar, and the quenching method i...

Embodiment 3

[0040] A preparation process for an Al-Zn-Mg alloy profile for a high-speed EMU car body, comprising the following steps:

[0041] (1) Extrusion: The mass percentage composition of each component with a length of 800mm includes: Mg: 1.2%, Zn: 4.0%, Si≤0.4%, Fe≤0.5%, Zr≤0.20%, Cr≤0.20% , V ≤ 0.03%, Al-Zn-Mg alloy ingot with the balance of Al, heated in a heating furnace, the heating temperature of the Al-Zn-Mg alloy ingot in the heating furnace is controlled at 450 ° C, and the Al- The temperature at the head of the Zn-Mg alloy ingot is 25°C higher than the temperature at the tail, and then on-line extrusion, the extrusion speed is controlled at 1.5m / min;

[0042] (2) Roller bottom continuous solution quenching: Put the Al-Zn-Mg alloy profile in step (1) into the roller hearth furnace, hold the temperature at 450°C, and the heat preservation accuracy is ±3°C, then perform continuous quenching, the quenching pressure It is 4.0bar, and the quenching method is water mist quenchin...

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Abstract

The invention relates to a preparation process of a Al-Zn-Mg alloy profile for a high-speed train body. The preparation process comprises the following steps that (1), extruding is carried out; (2), roll bottom continuous solution hardening is carried out; (3), stretching is carried out; (4), plate type three-stage aging oven for aviation aging treatment is carried out; (5), finished product saw cutting is carried out; and (6), packaging and storing are carried out. According to the preparation process of the Al-Zn-Mg alloy profile for the high-speed train body, roll bottom continuous solution hardening and plate type three-stage aging oven for aviation aging treatment are adopted for production, and thermal treatment precision can be greatly improved. Meanwhile, a gradient heating method is adopted during extrusion, the Al-Zn-Mg profile head and tail temperature difference is precisely controlled, the Al-Zn-Mg alloy profile head, middle and tail performance difference is reduced, and therefore the performance stability of the Al-Zn-Mg alloy profile is guaranteed.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal material processing, in particular to a preparation process of Al-Zn-Mg alloy profiles for high-speed EMU car bodies. Background technique [0002] Al-Zn-Mg alloy has high strength and excellent welding performance, and has become one of the main structural materials of high-speed railway car bodies. The use of Al-Zn-Mg alloy as the profile for the high-speed rail car body can not only ensure the strength of the car body, but also greatly reduce the weight of the car and effectively reduce energy consumption. At present, the heat treatment method used in the heat treatment of Al-Zn-Mg alloy profiles for high-speed EMU car bodies in industrial production is on-line quenching plus ordinary box furnace aging. The disadvantages of the existing heat treatment technology: (1) In conventional industrial production, on-line quenching The temperature accuracy is poor, the ordinary box furnace ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/002C22F1/053
Inventor 向晶莫宇飞李剑周伟覃珊秦颐鸣谢尚昇周文标
Owner 广西南南铝加工有限公司
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