Method for manufacturing 2-series aluminum alloy ingot

A technology of casting aluminum alloy ingots and aluminum alloys, which is applied in the field of aluminum alloys, can solve the problems of poor smoothness of the crystallizer, poor lubricating performance, and restrictions on wide application, and achieve the goals of increasing forming rate, reducing surface cracking, and increasing yield Effect

Active Publication Date: 2015-03-25
SOUTHWEST ALUMINUM GRP
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Problems solved by technology

[0003] Since the internal stress of the 2-series aluminum alloy casting process is very large, if the existing method is used to prepare the 2-series aluminum alloy ingot, it is difficult to achieve a good match in the casting process due to the casting temperature, casting cooling water flow, and casting speed, and the crystallizer itself The smoothness of the aluminum alloy is poor, and the lubrication performance is poor during the casting process, which leads to easy cracking of the bottom and corners of the ingot, which affects the yield of the 2-series aluminum alloy ingot
The experimental results show that according to the existing methods for preparing 2-series aluminum alloy ingots, the forming rate of the ingot is only about 60%, and the yield is less than 50%. The low yield of 2-series aluminum alloy ingots seriously limits its wide application , therefore, it is very necessary to study the preparation method of the new 2 series aluminum alloy ingot

Method used

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preparation example Construction

[0022] The embodiment of the present invention discloses a method for preparing a 2-series aluminum alloy ingot, comprising the following steps:

[0023] A) melting the raw materials of the 2 series aluminum alloy ingot;

[0024] B) importing the smelted melt into a holding furnace, and refining with a mixed gas, the mixed gas being a mixed gas of nitrogen and chlorine;

[0025] C) performing online degassing and online filtering sequentially on the melt obtained in step B);

[0026] D) casting the melt obtained in step C), the speed of the casting is 48-55mm / min, and the water flow is 28-35m 3 / h·root, the casting temperature is 715°C-725°C, and the 2-series aluminum alloy ingot is obtained.

[0027] This application provides a method for preparing a 2-series aluminum alloy ingot. During the preparation process, the raw materials of the 2-series aluminum alloy are smelted, refined, on-line degassed, on-line filtered and casted, thereby obtaining an aluminum alloy ingot. in...

Embodiment 1

[0034] Ingredients: raw materials include: 0.5wt% of Si, 0.5wt% of Fe, 4.9wt% of Cu, 0.9wt% of Mn, 1.2wt% of Mg, 0.1wt% of Cr, 0.25wt% of Zn and the balance of aluminum;

[0035] Melting: Melting the above raw materials in a melting furnace at a melting temperature of 770°C, flattening, melting and sampling analysis;

[0036] Treatment in the static furnace: transfer the melt in the smelting furnace to the static furnace for refining, use a "T" type refiner in the static furnace, and use N 2 -Cl 2 (N 2 : 88wt%, Cl 2 12%) mixed gas refining, N 2 require H 2 O≤15ppm, O 2 ≤15ppm, Cl 2 require H2 O≤500ppm, the refining time is 15-20 minutes, and the refining temperature is 715°C;

[0037] On-line processing: The refined melt is degassed and filtered on-line in sequence. On-line degassing is degassed by the rotary nozzle method, using Ar gas, the gas flow rate is 2500L / h / rotor, and the gas pressure is 0.35MPa. Through refining in a static furnace and on-line degassing, the...

Embodiment 2

[0041] Ingredients: raw materials include: 1.2wt% of Si, 1.0wt% of Fe, 5.0wt% of Cu, 1.2wt% of Mn, 0.05wt% of Mg, 0.1wt% of Cr, 0.25wt% of Zn and the balance of aluminum;

[0042] Melting: Melting the above raw materials in a melting furnace at a melting temperature of 730°C, flattening, melting and sampling analysis;

[0043] Treatment in the static furnace: transfer the melt in the smelting furnace to the static furnace for refining, use a "T" type refiner in the static furnace, and use N 2 -Cl 2 (N 2 : 88wt%, Cl 2 12%) mixed gas refining, N 2 require H 2 O≤15ppm, O 2 ≤15ppm, Cl 2 require H 2 O≤500ppm, the refining time is 15-20 minutes, and the refining temperature is 715°C;

[0044] On-line processing: The refined melt is degassed and filtered on-line in sequence. On-line degassing is degassed by the rotary nozzle method, using Ar gas, the gas flow rate is 2500L / h / rotor, and the gas pressure is 0.35MPa. Through refining in a static furnace and on-line degassing, ...

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Abstract

The application provides a method for manufacturing a 2-series aluminum alloy ingot. The method comprises the following steps: (A) smelting a raw material of the 2-series aluminum alloy ingot; (B) guiding a smelted fusant into a heat-preserving furnace, and refining by adopting a mixed gas, wherein the mixed gas is a mixed gas of nitrogen and chlorine; (C) sequentially carrying out on-line degassing and on-line filtration on the fusant obtained from the step (B); (D) casting the fusant obtained from the step (C) at the casting speed of 48-55 mm/minute, the water flow of 28-35 m<3>/hour.piece and the casting temperature of 715-725 DEG C to obtain the 2-series aluminum alloy ingot. The method provided by the application sequentially carries out the procedures of smelting, refining, the on-line degassing, the on-line filtration and casting in the manufacturing process of the 2-series aluminum alloy ingot and obtains an optimal proportion by regulating casting temperature, a casting cooling water flow and casting speed, thereby greatly enhancing the finished product ratio of the 2-series aluminum alloy ingot.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a method for preparing a 2-series aluminum alloy ingot. Background technique [0002] The 2-series aluminum alloys belong to the Al-Cu series heat-treatable and strengthenable aluminum alloys, including Al-Cu-Mg, Al-Cu-Mg-Si and Al-Cu-Mg-Fe-Ni alloys. Typical 2-series aluminum alloy grades are 2024, 2A12 and 2A14, etc., which have the advantages of low density, high strength, good processing performance, etc., and have good heat resistance, so they are widely used in aerospace, defense industry and civilian tools Fields, such as for the manufacture of cutting parts, cylinder plugs, propellers, aircraft wheel hubs, compressor impellers and accessories, rocket weldments, etc. [0003] Since the internal stress of the 2-series aluminum alloy casting process is very large, if the existing method is used to prepare the 2-series aluminum alloy ingot, it is difficult to achieve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C21/12
Inventor 廖知坚林红陈瑜孙自鹏
Owner SOUTHWEST ALUMINUM GRP
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