Extrusion forming process of a hollow thin-walled tubular magnesium alloy profile

A technology of extrusion molding and magnesium alloy, which is applied in the direction of metal material coating process, superimposed layer plating, vacuum evaporation plating, etc., can solve the problem of difficult to guarantee dimensional accuracy and dimensional stability, wear resistance and Poor corrosion, which affects the large-scale application of magnesium alloy profiles, etc., to achieve the effect of effectively absorbing dislocations and coordinated deformation, uniform extrusion structure, and fine grains

Active Publication Date: 2020-10-27
WUXI FUMEI LIGHT ALLOY TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the extrusion molding process for preparing hollow thin-walled magnesium alloy profiles with high precision and high performance is not yet mature.
[0004] Compared with commonly used metal steel and aluminum alloy, the plastic formability of magnesium alloy is relatively poor. When magnesium alloy is used as raw material to prepare magnesium alloy profiles through conventional extrusion process, there are defects such as large extrusion defects and difficult continuous production.
Especially in the preparation of complex cross-section or hollow thin-walled magnesium alloy profiles, the dimensional accuracy and dimensional stability are difficult to guarantee, and the wear resistance and corrosion resistance of the prepared magnesium alloy profiles are poor, which greatly affects the large-scale application of magnesium alloy profiles. There is an urgent need to develop a new extrusion molding process for tubular magnesium alloy profiles

Method used

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  • Extrusion forming process of a hollow thin-walled tubular magnesium alloy profile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In the extrusion molding process of the hollow thin-walled tubular magnesium alloy profile of this embodiment, the magnesium alloy composition mass percentage is: Al: 3.4wt.%, Zn: 1.5wt.%, Mn: 0.4wt.%, Si≤0.02 wt.%, Cr≤0.002wt.%, the balance is Mg and non-removable impurities, including the magnesium alloy billet pretreatment step and the extrusion step. The magnesium alloy billet pretreatment step includes: step S11, preheating the magnesium alloy billet Treatment, that is, send it into the resistance furnace and heat it to 300℃ in an inert gas atmosphere and keep it for 12-24 hours. The inert gas can be helium or argon. The preheat treatment of the magnesium alloy blank can make the internal structure of the magnesium alloy uniform. . After the magnesium alloy billet is preheated, it is classified and homogenized, that is, the magnesium alloy billet is first heated to 335°C and held for 4 hours, and then heated to 368°C and held for 8 hours, and the magnesium alloy bil...

Embodiment 2

[0024] The extrusion molding process of this example and Example 1 are mainly different in the composition of the magnesium alloy billet and the temperature at each stage. In the actual production process, the composition of the magnesium alloy billet and the temperature at each stage can be adjusted to obtain the enterprise Magnesium alloy profile of required size. In this embodiment, the magnesium alloy composition mass percentage is: Al: 3.3wt.%, Zn: 1.2wt.%, Mn: 0.38wt.%, Si≤0.025wt.%, Cr≤0.003wt.%, the balance For Mg and non-removable impurities, the homogenization treatment of magnesium alloy billet is to first heat the magnesium alloy billet to 350°C and keep it for 4 hours, and then heat it to 375°C and keep it for 8 hours. , That is, first send the cast rod into the resistance furnace and heat it to 400℃ and keep it for 2 hours, then heat it to 420℃ and keep it for 5 hours, and finally heat it to 445℃ and keep it for 1 hour. For the straightened hollow thin-walled tube...

Embodiment 3

[0026] The extrusion molding process of this embodiment and Embodiment 1 are mainly different in the composition of the magnesium alloy blank and the temperature at each stage. In this embodiment, the mass percentage of the magnesium alloy composition is: Al: 3.8 wt.%, Zn: 1.8wt.%, Mn: 0.42wt.%, Si≤0.03wt.%, Cr≤0.002wt.%, the balance is Mg and non-removable impurities, the homogenization treatment of magnesium alloy billet, that is, the magnesium alloy billet is heated first To 320°C and keep for 4 hours, then heat to 360°C and keep for 8 hours. The magnesium alloy cast rods are classified and homogenized, that is, the cast rods are first sent to the resistance furnace and heated to 380°C and held for 2 hours, and then heated Heat to 405℃ and keep it for 5 hours, finally heat to 430℃ and keep it for 1 hour. The straightened hollow thin-walled tubular magnesium alloy profiles are processed uniformly, that is, the hollow thin-walled tubular magnesium alloy profiles are heated to 1...

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Abstract

The invention discloses an extrusion molding technology for hollow thin-walled tubular magnesium alloy profiles. The technology comprises a magnesium alloy blank pretreatment step and an extrusion step and further comprises steps of chemical vapor deposition and magnetron sputtering coating treatment on surfaces of extrusion-molded hollow thin-walled tubular magnesium alloy profiles; and three-time hierarchical homogenization treatment is adopted in the magnesium alloy blank pretreatment step and the extrusion step and includes magnesium alloy blank hierarchical homogenization treatment, magnesium alloy cast rod hierarchical homogenization treatment and magnesium alloy profile hierarchical homogenization treatment. With the extrusion molding technology, the size precision and the size stability of the tubular magnesium alloy profiles prepared through hierarchical homogenization treatment are guaranteed, chemical vapor deposition and magnetron sputtering coating treatment is performed on the surfaces of the extrusion-molded hollow thin-walled tubular magnesium alloy profiles, and the abrasion resistance and the corrosion resistance of the tubular magnesium alloy profiles are improved.

Description

Technical field [0001] The invention relates to the technical field of magnesium alloy profile manufacturing, in particular to an extrusion molding process of a hollow thin-walled tubular magnesium alloy profile. Background technique [0002] Magnesium alloy is currently one of the lightest metal structural materials in industrial applications. It has high specific strength, specific stiffness, and good casting, shock absorption, cutting processing and dimensional stability. It has long caused the aviation industry and the automobile industry. Attention. [0003] Magnesium alloy pipes prepared by extrusion process have also entered the stage of industrial production, and are mainly used in bicycles and high-end cars. However, the extrusion molding process for preparing hollow thin-walled magnesium alloy profiles with high precision and high performance is not yet mature. [0004] Compared with commonly used metal steels and aluminum alloys, magnesium alloys have relatively poor pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C23/02C23C16/32C23C14/35C23C14/18C23C28/00
CPCC22C23/02C22F1/06C23C14/185C23C14/35C23C16/32C23C28/322C23C28/341
Inventor 魏峰丁方明丁汉林陈伟
Owner WUXI FUMEI LIGHT ALLOY TECH
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