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Preparation method of 7 series aluminum alloy ingots

An aluminum alloy ingot and aluminum alloy technology, applied in the field of aluminum alloys, can solve the problems affecting the yield of 7 series aluminum alloy ingots, poor smoothness of the mold, and low yield of 7 series aluminum alloy ingots, etc.

Inactive Publication Date: 2015-04-22
SOUTHWEST ALUMINUM GRP
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  • Abstract
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Problems solved by technology

[0003] Since the internal stress of the 7-series aluminum alloy casting process is very large, if the existing method is used to prepare the 7-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 the cracking of the bottom and corner of the ingot, which affects the yield of the 7 series aluminum alloy ingot
The experimental results show that according to the existing method for preparing 7-series aluminum alloy ingots, the forming rate of the ingot is only about 60%, and the finished product rate is less than 50%. The low yield of 7-series aluminum alloy ingots seriously limits its wide application , therefore, it is necessary to study the preparation method of the new 7 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 7-series aluminum alloy ingot, comprising the following steps:

[0023] A) melting the raw materials of the 7 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 7-series aluminum alloy ingot is obtained.

[0027] This application provides a method for preparing a 7-series aluminum alloy ingot. During the preparation process, the raw materials of the 7-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: 0.3wt% of Si, 0.35wt% of Fe, 0.2wt% of Cu, 0.3wt% of Mn, 0.7wt% of Mg, 0.2wt% of Cr, 5.5wt% 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 H 2O≤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, th...

Embodiment 2

[0041] Ingredients: raw materials include: 0.4wt% of Si, 0.5wt% of Fe, 1.5wt% of Cu, 0.3wt% of Mn, 2.5wt% of Mg, 0.24wt% of Cr, 5.2wt% 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, t...

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Abstract

The application provides a preparation method of 7 series aluminum alloy ingots. The preparation method comprises the following steps: (A) smelting a raw material of the 7 series aluminum alloy ingots; (B) guiding a melt after smelting into a heat preserving furnace, and performing refining by adopting a mixed gas which is a mixed gas of nitrogen and chlorine; (C) sequentially performing online degassing and online filtration on the melt obtained in the step (B); and (D) performing casting on the melt obtained in the step (C) to obtain the 7 series aluminum alloy ingots, wherein the casting speed is 48-55mm / min, the water flow rate is 28-35m<3> / h per each ingot, and the casting temperature is 715-725 DEG C. According to the preparation method provided by the application, during preparation of the 7 series aluminum alloy ingots, the processes of smelting, refining, online degassing, online filtration and casting are performed sequentially, and by matching the casting temperature, the casting cooling water flow and the casting speed, an optimal mixing ratio is obtained, so that rate of finished products of the 7 series aluminum alloy ingots is greatly improved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a method for preparing a 7-series aluminum alloy ingot. Background technique [0002] The 7-series aluminum alloy is an aluminum alloy with Zn as the main alloying element, which belongs to the aluminum alloy that can be strengthened by heat treatment. If Mg is added to the alloy, it will be Al-Zn-Mg alloy. The alloy has good thermal deformation performance, wide quenching orientation, high strength can be obtained under appropriate heat treatment conditions, good welding performance, and generally good corrosion resistance. , has a certain tendency to stress corrosion, and is a high-strength weldable aluminum alloy. This series of alloys is widely used in aviation and aerospace fields, and has become one of the most important structural materials in this field. [0003] Since the internal stress of the 7-series aluminum alloy casting process is very large, if the exist...

Claims

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Application Information

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IPC IPC(8): C22C1/06C22C21/10B22D7/00B22D7/12
Inventor 廖知坚林红陈瑜孙自鹏
Owner SOUTHWEST ALUMINUM GRP
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