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How is the aluminum alloy profile made?
Jan 06, 2018

Aluminum alloy profile production including casting, extrusion and oxidation the three processes.

 

1. Casting is the first process of aluminum profile production.

The main process is:

(1) ingredients: According to the specific needs of the production of alloy grades, calculated the amount of alloying ingredients, reasonable with a variety of raw materials.

(2) Smelting: the raw materials with good will be added into the smelting furnace according to the process requirements to melt, and the impurities and gases in the melt will be effectively removed through de-aeration and slag-refining methods.

(3) Casting: Molten aluminum liquid in a certain casting process conditions, through the deep casting system, cooling cast into a variety of round cast rods.

 

2, extrusion: extrusion is the means of profile forming. First, according to profile section design, to create a mold, the use of extrusion machine will be good to heat the casting rod out of the mold from the shape. Commonly used grades 6063 alloy, also used in the extrusion of an air-cooled quenching process and the subsequent artificial aging process to complete the heat treatment to strengthen. Different grades of heat-treated alloy, the heat treatment system is different.

 

3, oxidation: extruded aluminum profile, the surface corrosion resistance is not strong, to be anodized surface treatment to increase the corrosion resistance of aluminum, wear resistance and appearance of the aesthetics.

The main process is:

(1) Surface pretreatment: The surface of the profile is cleaned by chemical or physical methods, exposing the pure matrix to facilitate the complete and compact artificial oxide film. It is also possible to obtain a mirror or matt (matte) surface by mechanical means.

(2) anodizing: The surface pretreatment profiles, under certain process conditions, the substrate surface anodized to generate a dense, porous, strong adsorption of AL203 film.

(3) Sealing: The pores of the porous oxide film formed after the anodic oxidation are pore-sealed, so that the oxide film is resistant to pollution, corrosion and abrasion resistance. The oxide film is colorless and transparent. By utilizing the strong adsorption of the oxide film before sealing, some metal salts are adsorbed and deposited in the film pores to make the appearance of the profile appear in many colors other than the natural color (silver white), such as black, bronze, Golden and stainless steel and so on.

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