The latest production technology of aluminum foil

The latest production technology of aluminum foil

The first step, smelting

A large capacity regenerative melting furnace is used to convert the primary aluminum into aluminum liquid, and the liquid enters the casting and rolling machine through the flow groove. During the flow of the liquid aluminum, the refiner Al-Ti-B is added online to form a continuous and uniform refining effect. The graphite rotor degassing and slagging on line at 730-735°C, forming a continuous and uniform cleaning effect;

The second step, rough rolling

The molten aluminum after the first step is introduced into the casting and rolling machine to cast and roll into blank. In this process, the inlet temperature of the cooling water in the inner cavity of the roller is controlled at 20-23°C and the outlet temperature is controlled at 28-32*C. The static pressure of the aluminum melt between the rolls is controlled at 0.004-0.005Mpa, and the surface ratio of the crystal direction {100} is greater than 95% and the grain size is less than 5μm. The slab of 6.5-7.5mm is rolled out.


The third step, intermediate rolling

When the thickness of the slab is 4.5mm, the slab is sent to the annealing furnace, heated to 360°C and held for 2 hours, and then heated to 580°C and held for 18 hours. The homogenized annealing is carried out to make the grain size uniform and the orientation consistent. Then, it was cold rolled to 0.60mm in the cold rolling machine, and sent to the annealing furnace again, heated to 460°C, held for 5 hours, cooled to 400°C, held for 7 hours, and carried out intermediate annealing; Then continue rolling into a thickness of 0.3mm as aluminum foil wool;

The fourth step, foil rolling

The 0.3mm aluminum foil material was rolled into finished aluminum foil by a four-high irreversible foil rolling mill. The production process of the ultra-thin aluminum foil is short, the operation cost is low, the production investment is small, and the quality of the ultra-thin aluminum foil produced can reach the most advanced international level. Compared with the production process of the hot rolling method, the investment cost is reduced by two thirds in the production of blank, and the operation cost is reduced by more than half.