The main process is:
(1) batching: according to the specific alloy brand to be produced, the addition amount of various alloy components is calculated, and various raw materials are reasonably matched.
(2) Melting: the prepared raw materials are added into a melting furnace for melting according to the process requirements, and impurities and gases in the melt are effectively removed through degassing and slag removal refining.
(3) Casting: the molten aluminum is cooled, and under certain casting process conditions, it is cast into round cast bars of various specifications by a deep well casting system.
2. Extrusion: Extrusion is a way of profile forming. Firstly, the die is designed and manufactured according to the cross section of the profile product, and the heated round cast bar is extruded from the die by an extruder. The commonly used brand 6063 alloy has to undergo air cooling quenching process and subsequent artificial aging process to complete heat treatment and strengthening during extrusion. Different brands of heat-treatable strengthening alloys have different heat treatment systems.
3. Oxidation: The surface corrosion resistance of extruded aluminum alloy profile is not strong, so surface treatment must be carried out by anodic oxidation to improve the corrosion resistance, wear resistance and aesthetic appearance of aluminum.
The main process is as follows:
(1) surface pretreatment: clean the surface of the profile by chemical or physical methods to expose the pure matrix, so as to obtain a complete and dense artificial oxide film. Mirror or matt surface can also be obtained by mechanical means.
(2) Anodizing: Under certain technological conditions, the surface of the profile after surface pretreatment is anodized to form a dense, porous and absorbent AL203 film.
(3) Hole sealing: The pores of the porous oxide film generated after anodic oxidation are sealed, which enhances the anti-pollution, anti-corrosion and wear resistance of the oxide film. The oxide film is colorless and transparent. Using the strong adsorption of the oxide film before hole sealing, some metal salts are adsorbed and deposited in the film holes, which can make the appearance of the profile show many colors other than its original color (silvery white), such as black, bronze, golden yellow, stainless steel and so on.