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  • The introduction of aluminum nameplate and aluminum profiles

     

    1.  Aluminum nameplate and aluminum profile classification


    1. Pure aluminum sheet

    1060, 1065, 1070 are the common codes for pure aluminum sheet series. In all of the aluminum sheet series, pure aluminum sheet series is one of the most aluminiferous series, which purity can achieve more than 99.00%. Because there are no other technical elements, the manufacture process is rather simple, and price is relatively cheap, so this series is the most commonly used one in conventional industry. 1060 and 1070 are the most common series in current market.


    2.  Alloy aluminum sheet

    2 XXX series alloys:  2A16 (LY16) and 2A06 (LY6) are the representative sheets. 2XXX series alloys are a set of “hard alloy”, with the highest content of copper (3%-5%).2XXX series belong to aerospace alloys, which are not often applied in current conventional industry.
    3 XXX series alloys:  Alloy 3003, alloy 3004 and alloy 3A21 are the primary representatives. Manganese is the major alloying element of alloys in this group, which content ranging from 1.0% to 1.5%. This series have good corrosion resistance, and are commonly applied in the damp environment such as air conditioning, refrigerator, and vehicle bottom. Its price is higher than 1XXX series, which is a relatively common alloy series.
    4 XXX series alloys:  Alloy 4A01 is the representative. Major alloying element of this group is silicon, which content ranging from 4.5% to 6.0%. With lower melting point and good corrosion resistance, these alloys are used in welding wire and as brazing alloys.
    5 XXX series alloys: Alloy 5052, alloy 5074, alloy 5083 and alloy 5A05 are the representatives. 5 XXX series alloys are more commonly used series, the main elements is magnesium, which ranging from 3% to 5%. These are alloys of aluminum and magnesium. Low density, high tensile strength and high elongation are the main features of this series. With the same area, the weight of the aluminum/magnesium alloy is less than other series, so it is widely applied in aviation field, such as airplane oil tank, and so in conventional industry. The processing technologies for this series are continuous casting and rolling, so further oxidation processing can be applied to this series. 5XXX series alloys are one of the mature aluminum series in China, which can be well used for drawing.
    6 XXX series alloys: Alloy 6061, alloy 6063 are the most common ones. Magnesium and silicon are the two major alloying elements of this group, which makes it has the advantage of 4××× series and the advantage of 5××× series. Alloy 6061 is a cold treatment aluminum forging products, which is suitable for high corrosion resistance and high oxidation demanding applications. Good workability, excellent interface, easy coating, good deformability make it can be used in low pressure weapons and plane adapter.
    7 XXX series alloys:  Alloy 7075 is the representative. Major alloying element of this group is zinc. These are the aluminum/magnesium-zinc-copper alloys, with characters of heat treatable, super hard and good wear-resistance, which are widely used in aerospace. Alloy 7075 has been eliminated the stress, so it won’t deform and after processing. All of the super large and super thick alloys 7075 are detected by ultrasonic to make sure there is no sand holes or impurities. The high thermal conductivity of alloy 7075 can shorten cycle time and improve work efficiency.主High hardness is the main characteristic of alloy 7075, so it is often used to manufacture airplane.


    3. Aluminum profile definition:

    Aluminum profile is aluminum rod through the hot melt, extrusion, resulting in different cross-sectional shape of the aluminum material.


    4. Classification:

    Aluminum alloy can be divided into some nameplates such as 1024, 2011, 6063, 6061, 6082, 7075, among them six series are the most common one. Different nameplate means different grades of metal ingredients. Except the commonly used windows aluminum such as 60 series, series 70, series 80, series 90 series and curtain wall aluminum, the industrial aluminum does not have clear model distinguish, most of the manufacturers are processed in accordance with the customer’s actual drawings.


    2. Manufacture Process:

    Aluminum production processes including three steps: casting, extrusion, and coloring. Among them, the coloring include: oxidation, electrophoresis coating, fluorine carbon spraying, powder coating, wood grain transfer printing and other processes.


    1. Casting is the first procedure to manufacture the aluminum profile.

    The main processes are listed as below:
    (1) Ingredients: Calculate the additive amount of all kinds of the alloy components and reasonably collocate all kinds of raw materials according to the specific alloy nameplate.
    (2) Melting: Put the mixed raw materials into the smelting furnace according to therequirement of process, and eliminate the miscellaneous slag, gas effectively through the refining method such as degassing, deslagging.
     (3) Casting: Under certain casting process condition, through the deep well casting system, the cooled aluminum liquid is casted into various specifications of the round casting bar.


    2. Extrusion

    Extrusion is the means for profile to be formed into shapes. According to profile section, mould was designed and manufactured, the heated round casting bar was extruded into shapes from the mould using extrusion machine. As for the commonly used nameplate 6063 alloy, additional air-blast quenching process and artificial aging process are applied to strengthen the heat treatment. Different nameplate alloy has different heat treatment system.


    3. Coloring (here focus on oxidation process)

    Oxidation: Extruded aluminum alloy profile, which surface corrosion resistance is not strong, must go through the surface anodic oxidation treatment to increase the corrosion resistance, the abrasive resistance and the aesthetic degree in the appearance.
    The main processes are as follows:
     (1) Surface pretreatment: Cleaning the profile surface with chemical or physical method to expose the pure matrix, then we get a complete, compact artificial oxidation film. We can also get a mirror or matt surface by mechanical means.
    (2) Anodic oxidation: After surface pretreatment, there is an anodic oxidation on the matrix surface of profile under certain technology condition, generating a compact, porous, strong absorptive membrane layer AL203.
    (3) Hole sealing: The film holes of porous oxidation film were closed, to enhance the pollution prevention, corrosion and wear-resistance abilities.  Oxidation film is a colorless and transparent, using its strong adsorption before hole sealing, it can adsorb and deposit some metal salt in the film hole to make the profile more colorful, such as black, tan, golden yellow and stainless steel

     

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