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Preparation method for aluminum alloy casting

An aluminum alloy casting and aluminum alloy technology, which is applied in the field of aluminum alloy casting, can solve the problems of high cost of metal molds, poor organizational uniformity, and enlarged mold size, and achieve the effects of improving quality, dense organization, and reducing grain size.

Active Publication Date: 2020-11-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the slow cooling speed of the sand mold, the melt directly contacts with the molding sand, resulting in defects such as sand inclusions and coarse structures in the ingot; the cooling speed of the metal mold is fast, but the uniformity of the structure between the surface and the center of the casting is poor. It is necessary to increase the size of the mold, resulting in high cost and difficult processing of metal molds

Method used

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  • Preparation method for aluminum alloy casting
  • Preparation method for aluminum alloy casting
  • Preparation method for aluminum alloy casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of Al-Cu-Mg-Mn aluminum alloy casting, concrete preparation method, steps are as follows:

[0030] A. Ingredients: Al-Cu-Mg-Mn aluminum alloy ingots are mixed with raw materials according to the following weight percentages: copper content 4.6%, magnesium content 0.6%, manganese content 0.8%, and the balance is pure aluminum;

[0031] B. Smelting: Aluminum and magnesium raw materials are added in the form of pure metal, and the rest are added in the form of master alloy: add pure aluminum (99.99%) into the resistance furnace, heat at 820°C, and melt into molten aluminum; then add aluminum-manganese master alloy, aluminum in sequence Copper master alloy, the heating temperature is 770°C, and finally the pure magnesium ingot is fed into the resistance furnace with a feeder and stirred and melted, the heating temperature is 760°C;

[0032] C. Mold: Design and prepare a steel mold of a certain size (wall thickness 35mm) according to the size of the aluminum alloy ing...

Embodiment 2

[0037] A. Ingredients: In the aluminum alloy ingot, the raw materials are mixed according to the following weight percentages, wherein the manganese content is 1.0%, the magnesium content is 0.6%, the Si content is 0.6%, the Fe content is 0.7%, the impurity content is less than 0.2%, and the balance is pure aluminum.

[0038] The remaining steps are the same as in Embodiment 1.

Embodiment 3

[0040] A. Ingredients: In the aluminum alloy ingot, the raw materials are mixed according to the following weight percentages, wherein Si content is 6%, Mg content is 0.8%, Fe content is 0.8%, Cu content is 0.3%, and the balance is aluminum and non-removable impurities.

[0041] The remaining steps are the same as in Embodiment 1.

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Abstract

The invention discloses a preparation method for an aluminum alloy casting, and relates to the field of aluminum alloys. Aiming at the problems of coarse structure, easiness in sand inclusion and difficulty in metal mold casting operation in existing aluminum alloy sand mold casting, the invention provides a special combined mold which adopts a metal mold as an inner mold, is surrounded by a cooling pipe and adopts a sand mold as an outer mold, and blended raw materials are smelted, refined, deslagged, degassed and poured to prepare the high-quality and high-performance casting. Due to the fact that the metal inner mold is good in heat conduction performance and high in cooling speed, the grain size of an aluminum alloy formed part is obviously reduced, the solidification rate of the meltis regulated and controlled through cooling water and the sand mold outer mold, the prepared aluminum alloy casting is compact in structure, small in grain size, uniform in component, capable of expanding a central equiaxed crystal region, and superior to a casting prepared through the sand mold and the metal mold in performance, and the method is simple, is low in cost and has important value inthe field of aluminum alloy preparation.

Description

technical field [0001] The invention provides a method for preparing an aluminum alloy casting, which belongs to the technical field of aluminum alloy casting. Background technique [0002] Al-Cu-Mg-Mn aluminum alloy has the characteristics of low density, high strength and excellent plasticity. It also has excellent electrical and thermal conductivity. It has a wide range of applications in the industrial field, especially in the aerospace field. It is an important structural material for aerospace vehicles. , Aircraft fuselage joints, frames, wheels and other supporting structural parts are all made of aluminum alloy. [0003] Al-Cu-Mg-Mn aluminum alloys are usually formed by casting combined with deformation processing. Among them, high-quality castings are one of the key factors affecting the structure and performance of aluminum alloy deformed parts. At present, the casting of aluminum alloy mostly adopts sand mold or metal mold. Due to the slow cooling speed of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C21/16C22C21/00C22C21/02C22C21/10B22D27/04B22C9/06C22C1/06
CPCC22C1/03C22C1/026C22C21/16C22C21/00C22C21/02C22C21/10B22D27/04B22C9/068C22C1/06
Inventor 刘祖铭周旭任亚科农必重卢思哲曹镔艾永康魏冰吕学谦
Owner CENT SOUTH UNIV