Aluminium sign profiles
Aluminum sign profiles are widely used in commercial malls, urban transportation, medical hospitals, education schools and other places. How much do you know about the production of aluminum sign profiles?
Aluminium sign profiles
Aluminum sign profiles production includes three main processes: casting, extrusion and oxidation
1. Casting is the first process of aluminum profile production The main process is as follows （ 1) Composition: according to the specific alloy grade to be produced, calculate the amount of various alloy components, and reasonably match various raw materials. （ 2) Smelting: the prepared raw materials are added to the smelting furnace for smelting according to the process requirements （ 3) Casting: under certain casting process conditions, molten aluminum is cooled and then cast into various specifications of round casting rods through deep well casting system.
2. Extrusion Extrusion is a way of contour forming. The mould is designed and manufactured according to the cross section of the profile product, and the heated round cast bar is extruded from the mould by extruder. 6063 alloy is a common alloy. In the extrusion process, air cooling quenching process and subsequent artificial aging process are used to complete the heat treatment strengthening. Different heat treatment strengthening alloys have different heat treatment systems.
3. Anodizing: the surface of extruded aluminum sign profiles has poor corrosion resistance, so it must be anodized to improve the corrosion resistance, wear resistance and appearance of aluminum materials. The main process is as follows （ 1) Surface pretreatment: clean the profile surface by chemical or physical methods, and expose the pure substrate, which is conducive to obtain a complete and dense artificial oxide film. Mirror or matte surfaces can also be obtained mechanically. （ 2) Anodizing: under certain conditions, the surface of the profile substrate which is pretreated is anodized to form a dense, porous and strongly adsorbed Al203 film. （ 3) Hole sealing: the holes of the porous oxide film formed after anodization are sealed to enhance the anti pollution, corrosion resistance and wear resistance of the oxide film. The oxide film is colorless and transparent. Before sealing, some metal salts are adsorbed and deposited in the pores of the oxide film by the strong adsorption of the oxide film, which can make the outline appearance show many colors other than the original color (silver white), such as black and bronze