Continuous casting technique for aluminum alloy thin belt blank

Abstract

The invention discloses a continuous casting process of an aluminum thin billet, which is characterized in that the following steps are included: aluminum alloy ingots are preheated and are melted in a melting furnace in the role of a flux; before casting, a side closure system is preheated to 400-450 DEG C, when the temperature of a melting body ranges from 650 DEG C to 680 DEG C, the aluminum alloy ingots are arranged into a tundish for 15 to 30 minutes in the role of the flux, then through a flux distributing device, the aluminum alloy ingots flow into an equant vertical twin-roll thin strip billet continuous caster, with a left forging seam gap being 0 mm and maintaining the height of a melting pool between 90 mm and 340 mm, the casting is carried out in a sinking way; when in casting, the casting speed of the casting machine ranges from 20 to 120m / min, the thin strip blank is sent into a pinch roll after leaving a casting roller, and the forged aluminum alloy thin strip has a thickness between 1.0 mm and 3.5 mm. The continuous casting process can directly make aluminum alloy thin strip blank from the liquid aluminum alloy, the forged thin strip blank has good quality on the surface, and the internal organizational structure is uniform, thereby being conducive to succeeding rolling processes. The continuous casting process for an aluminum thin blank has short process and low cost.

Description

technical field [0001] The invention belongs to the field of near-net shape casting of nonferrous metals, in particular to a continuous casting process of aluminum alloy strips. Background technique [0002] Aluminum alloy is a light metal material and the most widely used non-ferrous metal material at present. It has high specific strength, specific stiffness and good processing performance. It is widely used in aerospace, transportation and daily necessities. [0003] The traditional production process of aluminum alloy thin strip is: smelting→ingot casting→homogenization→face milling→heating→hot rolling→cold rolling→annealing of finished products. The process is long and the investment in equipment is large. [0004] Chinese patent CN1994620 discloses a continuous casting system and process of aluminum foam, and CN1939610 and CN1995423 disclose a twin-roll casting and rolling technology of aluminum alloy strip blanks. These disclosed patents all adopt the continuous cast...

AI Technical Summary

Problems solved by technology

Although this process is easy to control, and can simplify the traditional production process of aluminum alloy thin strips and realize near-net shape processing to prepare aluminum alloy strip blanks, it has inherent disadvantages: the short contact area requires the formation of solidified shells. Long cooling time; the horizontal twin-roll method emphasizes the rolling effect of the casting rolls, requiring a certain amount of rolling deformation; the cooling effect of the upper and lower rolls is inconsistent, and the surface morphology of the liquid film on the upper and lower surfaces of the condensation zone is inconsistent, resulting in Inhomogeneous quality and internal organization

Therefore, the production efficiency is low, the cooling rate of the aluminum alloy thin strip blank is slow, the thin strip structure is uneven, and the performance is not good, which is not conducive to direct subsequent rolling processing

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