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Extrusion production process of Al-Zn-Mg alloy profile for high-speed rail car body

A technology for alloy profiles and high-speed rail car bodies, applied in the field of aluminum alloy processing, can solve problems such as poor stress corrosion resistance, very high equipment requirements, and low production efficiency, so as to reduce extrusion force, improve overall performance, and increase yield Effect

Inactive Publication Date: 2015-05-20
广西南南铝加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Al-Zn-Mg alloys can precipitate solid solution atoms to form dispersed strengthening phases through artificial aging, and improve the strength of the profile. The alloy in the peak aging state of T6 has the highest strength, but its stress corrosion resistance is poor; T73 is often used in industry. In 1974, Israel proposed a three-stage aging process - regression re-aging treatment process, which can make the intragranular structure similar to the T6 state, while the grain boundary structure is similar to the T73 state Similar to that, the alloy obtains higher strength and good stress corrosion resistance
However, the process is protected by patents and has been kept secret. The requirements for equipment are very high, and the production efficiency of industrial production is very low. At present, it is only used in the production of some important aluminum alloy parts for aviation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take the Al-Zn-Mg alloy ingot for the high-speed rail car body and carry out extrusion processing. The specific steps are:

[0032] Ingot heating: Select an ingot with a length of 500mm, heat it so that the temperature difference between the head and tail is 5°C, and control the heating temperature of the ingot in the heating furnace at 450°C;

[0033] Mold heating: the mold is heated to 470°C in a heating furnace and kept for 3 hours;

[0034] Extrusion barrel heating: the temperature of the extrusion barrel is controlled at 400°C;

[0035] Extrusion production: After the ingot and mold are heated and the extrusion cylinder reaches temperature, the heated ingot upper mold is extruded, and the extrusion speed is controlled at 0.5m / min;

[0036] On-line quenching: ensure that the inlet temperature of the profile quenching area is above 450°C, the quenching method can be selected from air cooling, strong wind, and water mist cooling, the quenching of each area of ​​the h...

Embodiment 2

[0042] Take the Al-Zn-Mg alloy ingot for the high-speed rail car body and carry out extrusion processing. The specific steps are:

[0043] Ingot heating: choose an ingot with a length of 2000mm, heat it so that the temperature difference between the head and tail is 50°C, and control the heating temperature of the ingot in the heating furnace at 510°C;

[0044] Mold heating: the mold is heated in a heating furnace at 520°C and kept for 40 hours;

[0045] Extrusion barrel heating: the temperature of the extrusion barrel is controlled at 470°C;

[0046] Extrusion production: After the ingot and the mold are heated and the extrusion cylinder reaches temperature, the heated ingot upper mold is extruded, and the extrusion speed is controlled at 4.5m / min;

[0047] On-line quenching: ensure that the entrance temperature of the profile quenching area is above 460°C, the quenching method can be selected from air cooling, strong wind, and water mist cooling, the quenching of each area ...

Embodiment 3

[0053] Take the Al-Zn-Mg alloy ingot for the high-speed rail car body and carry out extrusion processing. The specific steps are:

[0054] Ingot heating: Select an ingot with a length of 1000mm, heat it so that the temperature difference between the head and tail is 15°C, and control the heating temperature of the ingot in the heating furnace at 480°C;

[0055] Mold heating: the mold is heated to 500°C in a heating furnace and kept for 20 hours;

[0056] Extrusion barrel heating: the temperature of the extrusion barrel is controlled at 450°C;

[0057] Extrusion production: After the ingot and mold are heated and the extrusion cylinder reaches temperature, the heated ingot upper mold is extruded, and the extrusion speed is controlled at 1m / min;

[0058] On-line quenching: the entrance temperature of the profile quenching area is guaranteed to be 470°C, the quenching method can be selected from air cooling, strong wind, and water mist cooling, the quenching of each area of ​​th...

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Abstract

The invention discloses an extrusion production process of an Al-Zn-Mg alloy profile for a high-speed rail car body, relating to the technical field of aluminum alloy processing. The extrusion production process comprises the steps of ingot heating, mold heating, container heating, extruding production, on-line quenching, breaking, stretching and straightening, artificial ageing and the like. By controlling the parameters of ingot temperature, mold temperature, container temperature, extruding speed, stretching rate, ageing temperature, ageing time and the like, the overall performance of Al-Zn-Mg alloy car body profile for high-speed rail is improved, the evenness of mechanical property is controlled, the stability of industrial production is improved, and therefore the production efficiency of a profile product for the high-speed rail car body is improved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing, in particular to an extrusion production process of Al-Zn-Mg alloy profiles for high-speed rail car bodies. Background technique [0002] Al-Zn-Mg alloy has high strength and excellent welding performance, and has been widely used in rail transportation, military facilities, aerospace and other fields. 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, which can effectively reduce energy consumption. [0003] Al-Zn-Mg is a medium-high-strength aluminum alloy with high deformation resistance. In order to ensure the smooth progress of extrusion, it is usually necessary to increase the extrusion temperature, or reduce the length of the ingot, or reduce the extrusion speed in industrial production. To reduce the extrusion force and ensure more extrusion length of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/02B21F1/02C22F1/053
Inventor 谢尚昇乐永康沙江刘志伟赵茂密李飞庆
Owner 广西南南铝加工有限公司
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