[China Aluminum Industry Network] Characteristics of Aluminum Alloy Profiles for Civil Buildings Along with the economic development and improvement of people’s living standards, the variety and number of aluminum profiles for civil buildings have rapidly increased. At present, thousands of civil building profile production lines have been established in various countries in the world. The process equipment, production technology, and mold design and manufacturing have all been basically established, with standardized and serialized features.
(1) The vast majority of residential building profiles are produced using 6063-T5/T6 aluminum alloys. This is because 6063 aluminum alloys are lightweight, have good plasticity, and have good processability and surface treatment properties. It can be used to produce lightweight, beautiful, durable high-quality profiles.
(2) Ten thousand kinds of architectural aluminum profiles have been developed in the world. The cross-sectional area ranged from 0.1 to 100 cm, the circumscribed circle diameter ranged from φ8 to 350 mm, and the web thickness ranged from 0.6 to 15 mm.
(3) Aluminium and aluminum profiles for civil buildings have a thin wall. The wall thickness of most aluminum profiles is 0.6 to 2 mm. The shape is very complex and the section changes drastically. The relevant dimensional accuracy is high and the technical difficulty is high. Most of them are ultra-high precision thin. Wall profiles.
(4) The proportion of hollow products in architectural aluminum profiles is very large. The ratio of hollow profiles to solid profiles is about 1:1, and the inner cavity is mostly shaped holes, and some are often porous shaped thin-walled hollow products.
(5) A group of building aluminum materials need to be assembled into different door and window series or other building structures, so there are many matching surfaces, assembling dimensions, and many decorative surfaces. In order to reduce the variety of profiles, the profiles are required to have versatility and interchangeability, which is to improve the accuracy requirements and surface quality requirements of profiles.
As the aluminum profiles for civil buildings have the above characteristics, the difficulty of mold design and manufacture is increased.
Civil architectural aluminum extrusion die design features Civil building profile extrusion die design in addition to follow the general mold design principles, there are the following characteristics:
(1) The preferred specific pressure range of the extruder is 350~700 MOa;
(2) The preferred range of extrusion coefficient is 30~80;
(3) The preferred specific pressure and extrusion coefficients can be adjusted by the extruder, extrusion cylinder, extrusion process parameters, ingot length, and number of holes in the die.
Extrusion die types and their structural characteristics Extrusion of extruded aluminum profiles for civil buildings can be divided into two categories, plane and hollow. Hollow mold can be divided into plane split combined mold, star combined mold and tongue mold. Among them, plane split combined mold is more commonly used, accounting for more than 95%.
Surface grinding is used for extruding solid profiles. Extrusion dies can be made very thin. Molds used on small and medium sized extruders up to 14.7 MN can be as thin as 20 to 25 mm. Molds for 15.7 to 34.3 MN extruders can be used. 30mm thick. The thin mold is easy to manufacture and easy to repair and polish the work surface. In order to ensure mold strength and product dimensional stability, increase the thickness or number of mold pads.
The flat-flow split-combination die is used for extruding the hollow profile. Due to the secondary deformation, the required extrusion force is relatively large, and it is easy to cause boring cars. Extruding hollow profiles with this die has a high yield rate. The die is easy to manufacture and the production operation is simple. It can produce a variety of high-precision, high-gloss surface, complex shape thin-walled hollow profile and porous hollow profile, but in the extrusion It is more difficult to repair the mold and clean up the residue when pressing or squeezing.
The star combination die is suitable for hollow profiles with large external dimensions. The extrusion force is smaller than that of the flow splitting die. The yield of the profile is high, and the residue removal is relatively easy, but the die processing is more difficult.
Tongue mold residue is longer, the profile yield is low, mold processing difficulty is between the two, but the extrusion resistance is small, and the residue is easy to clean in the extrusion or the end of the extrusion, repair the mold is convenient Therefore, it is mostly used for thin-walled hollow sections or hard alloy military aluminum that require high extrusion pressure.
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