1. Melting and casting is the first process of aluminum production.
The main processes are
(1) Batching: According to the specific alloy grade to be produced, calculate the amount of various alloy components to be added and reasonably match various raw materials.
(2) Smelting: The raw materials are added to the melting furnace and melted according to the process requirements, and the trash and gas in the melt are effectively removed by means of degassing and dross removal refining.
(3) Casting: Under certain casting process conditions, the melted aluminum liquid is cooled and cast into various specifications of round cast bars through deep well casting system.
2,Extrusion: Extrusion is the means of profile forming. First, according to the section of the profile product design and manufacture of the mold, the use of extrusion machine will be heated round casting rod from the mold extrusion molding. Commonly used grades of 6063 alloy, extrusion is also used in an air-cooled quenching process and the subsequent artificial aging process to complete the heat treatment strengthening. Different grades of heat treatable reinforced alloys have different heat treatment regimes.
3, oxidation: extrusion of good aluminum alloy profiles, its surface corrosion resistance is not strong, surface treatment through anodic oxidation to increase the corrosion resistance of aluminum, wear resistance and appearance of the aesthetics.
The main process is as follows
(1) Surface pretreatment: the surface of the profile is cleaned by chemical or physical methods to expose the pure substrate in order to obtain a complete and dense artificial oxide film. Mirror or non-glossy (matte) surfaces can also be obtained by mechanical means.
(2) Anodic oxidation: After the surface pretreatment of the profile, under certain process conditions, anodic oxidation occurs on the surface of the substrate to generate a layer of dense, porous and strongly adsorbed AL203. film layer.
(3) Seal pore: The pores of the film pores of the porous oxide film generated after anodic oxidation are closed, so that the anti-pollution, corrosion resistance and wear resistance of the oxide film are enhanced. The oxide film is colorless and transparent. Using the strong adsorption of the oxide film before sealing, some metal salts are adsorbed and deposited in the pores of the film, which can make the appearance of the profile show many colors other than the original color (silver white), such as: black, bronze, golden yellow and stainless steel color, etc.
