Four commonly used production processes for aluminum alloy profiles

by:Zeyi     2021-07-26
The four commonly used production processes for aluminum alloy profiles are ingot casting, extrusion, heat treatment and surface treatment. So, what are the characteristics of these four aluminum alloy production processes? The editor tells you here:   Ingot casting: This process includes the main processes of batching, smelting, casting, soaking, etc., forming an ingot with a certain chemical composition and external dimensions. The prepared raw materials are smelted in a gas furnace or an electric furnace. The smelted melt passes through a static furnace, a launder, a flow plate, and a filter to the crystallizer, and then is water-cooled to form an ingot of a certain shape to ensure the ingot The surface is smooth and clean, using magnetic casting or hot top casting method for multi-mold (multi-mold) casting; soaking of the ingot is to homogenize the metallographic structure of the as-cast state, so that the main strengthening phase is dissolved, and the soaking is Performed in a hot furnace, soaking improves the plasticity of the ingot, which is beneficial to increase the extrusion speed, prolong the life of the extrusion die, and improve the surface quality of the extrusion profile.  Extrusion: Extrusion molding is carried out on an automatic production line composed of ingot heating, extrusion, cooling, tension straightening and sawing. The equipment on the production line includes induction heating furnace, extruder, discharge table, discharge conveyor, aluminum alloy profile lifting and transferring device, cooling bed, tension leveler, storage table, traction machine and sawing machine, etc. The heating temperature of the ingot is generally controlled at 400 ℃ ~ 520 ℃, the temperature is too high or too low will directly affect the extrusion molding. The extruder generally uses a single-acting hydraulic press with a tonnage between 1200 tons and 2500 tons. The diameter of the extrusion cylinder of the extruder varies with the tonnage of the extruder. The tonnage of the extruder is large, and the diameter of the extrusion cylinder is also large. The diameter of the extrusion cylinder is generally in the range of 150mm~300mm. The working temperature of the extrusion tool is 360℃~460℃, and the extrusion speed is 20m/min~80m/min. Extrusion tools mainly include molds, which are divided into flat molds, split molds, tongue molds, and split combined molds according to their structural characteristics. Flat molds and split combined molds are used for the production of aluminum alloy door and window profiles. The discharging station receives the profile extruded from the extruder and transfers the profile to the discharging work station. The discharging workbench is mostly a horizontal conveyor type, and its horizontal movement speed is synchronized with the extrusion speed. The cooling bed is mostly walking beam type, and a considerable number of fans are installed below to ensure uniform cooling of the profile, so that the temperature of the profile is lower than 70 ℃ before straightening. The tension leveler is equipped with twisting jaws, which can be stretched and straightened while twisting. Behind the tension leveler is the storage table, which provides profiles to the sawing machine worktable, and the sawing machine cuts the profiles according to a fixed length.   Heat treatment: Through different quenching and aging systems, the aluminum alloy profile can get the mechanical properties it deserves.  Surface treatment. Surface treatment can enhance the appearance of aluminum profiles and prolong the service life of aluminum alloy profiles. The surface treatment of aluminum alloy profiles can also be colored, and can be subjected to natural oxidation coloring, electrolytic coloring and immersion coloring.
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