Manufacturing technology for continuously casting and rolling aluminum alloy plate strips

Abstract

The invention discloses a manufacturing technology for continuously casting and rolling aluminum alloy plate strips. The manufacturing technology comprises the steps of smelting, continuous casting and rolling and winding and specifically comprises the steps that dosing, fusing stirring, refining treatment, slag skimming, standing, grain refining treatment, degassing, filtering and slag removing are carried out to obtain an aluminum alloy solution; then the aluminum alloy solution is cast horizontally, enters a die cavity and is cooled to obtain a cast blank; the die cavity is formed in the manner that a steel strip closes the edge of a crystallization wheel groove, and the side faces of the periphery of the die cavity are uniformly covered with a plurality of nozzles used for spraying cooling water; after being straightened, the obtained cast blank is subjected to hot continuous rolling three times; and then shearing and winding are carried out to obtain the plate strips. The casting and cooling manners are improved, the structure property of the cast blank is improved greatly, the thickness of the cast blank can reach 38-45 mm, the width can reach 500-800 mm, the equipment investment is small, in the production process, alloys can be switched flexibly, equipment is small in loss and large in yield, the product quality is stable, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of metal processing, and in particular relates to a preparation process for continuous casting and rolling of aluminum alloy strips. Background technique [0002] At present, there are various continuous casting and rolling methods at home and abroad: 1) The double-strip type includes the Hazelett method (Hazelett) and the Kaiser micro method (Kaiser); the Hazelett method has large equipment investment and high production capacity. The product quality can only meet the products with low requirements on the surface of the product, and the production of alloys is small, and the alloy grade cannot be replaced frequently. The thickness of the strip blank is limited to 12.7~38.1 mm; If it is less than 5 mm, the width of the strip blank is limited in the range of 270~400 mm. 2) The double crawler type includes the Rauner method (Casrter II) and the Hunter-Douglas method (Hunter-Douglas); the Rauner method require...

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Problems solved by technology

[0002] At present, there are various continuous casting and rolling methods at home and abroad: 1) The double-strip type includes the Hazelett method (Hazelett) and the Kaiser micro method (Kaiser); the Hazelett method has large equipment investment and high production capacity. The product quality can only meet the products with low requirements on the surface of the product, and the production of alloys is small, and the alloy grade cannot be replaced frequently. The thickness of the strip blank is limited to 12.7~38.1 mm; If it is less than 5 mm, the width of the strip blank is limited within the range of 270~400 mm

2) The double crawler type includes the Rauner method (Casrter II) and the Hunter-Douglas method (Hunter-Douglas); the Rauner method requires a large investment in equipment and high production capacity. The thickness of the slab is generally 15~40 mm, and the width is generally 600~1700mm , the casting speed is generally 2~5 m / min, the product quality can only meet the products with low requirements on the surface of the product, the production of alloys is small, and the alloy grade cannot be changed frequently; the difference between the Hunter-Douglas method and the Rauner method is only in the return of the quenching block The cooling method in the process, the Launer method adopts a special cooling system for cooling, and the Hunter-Douglas cooling block itself has a cooling and heat removal function without a special cooling system

In short, the thickness of the slab produced by the existing continuous casting technology at home and abroad is difficult to reach more than 40 mm, and when the width of the slab is greater than 500 mm, the casting speed is low, and the performance of the final slab is also poor.

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