BCAST branch Brunel University recent work has shown that mature strong shear melt processing of molten aluminum magnesium alloy may be formed semi-solid slurry, this slurry may be used in a variety of conventional casting, twin roll casting comprising . Direct input of pre-conditioned semi-solid metal continuous casting has opened up a two-roll cast aluminum alloy line. This provides a potential opportunity to produce defect-free cast coils from secondary metals that are susceptible to melting by twin rolls.
Smelting mode: Co-rotating with a fully meshed and self-wiping screw in an accurately controlled temperature cylinder. The screw has a specially designed profile to achieve high shear rates, high strength turbulence and the required residence time. The smelting conditions are constant temperature and chemical composition fixed, and the dense melt shearing converts any oxygen particle beam and oxide film into refining, and the shearing force completely wets the liquid metal to form a constant and satisfactory dispersed particle. The liquid metal temperature distribution is uniform and constant, all crystal nuclei are not destroyed, a critical supercooling, and heterogeneous nucleation conditions throughout the liquid metal. The continuous casting zone on the feed section requires a uniformly uniform, finely complete, equiaxed microstructure of the microstructure, followed by simple hot working to obtain a high quality sheet. A multi-purpose instrumentation machine for conventional roll continuous casting with high shear processing of semi-solid metal is called twin roll rheocasting (TRRC).
Since TRRC can allow for higher levels of impurities, especially iron , the opportunity to recycle scrapped vehicle waste into twin-roll continuous casting materials is greatly increased. Combined with a low conversion cost twin roll casting process and cost-saving high waste utilization, TRRC has the potential to be the most cost-effective way to produce high performance automotive sheet products like the AA5754.
TRRC technology not only provides a cost-effective way to produce automotive steel sheets, but also presents a unique opportunity to recycle scrapped vehicles, while also establishing a reliable waste stream that minimizes cost and stabilizes prices.
Since most cars are currently constructed using steel, there is not enough scrap aluminum scrap used as the raw waste stream. Prior to having sufficient vehicle waste, the secondary source of secondary metal raw materials was used aluminum cans. There is currently a huge library of used aluminum cans for recycling. Statistics (2006) are shown below:
(l) The total recovery rate of aluminum beverage cans in Western Europe is 57.7%, but some countries are much higher, such as Belgium, Denmark, Finland, Germany, Norway, the Netherlands, Sweden and Switzerland, where the recycling rate exceeds 80%. . Suppose the Western European market has 28 billion cans a year, and the recovery rate of 57.7% is 215,000 tons.
(2) The total recovery rate in North America is 56%. Suppose the market has 100 billion cans, which marks more than 690,000 tons.
The above data means that the annual low-cost secondary metal totals more than 900,000 tons, while the world's largest smelter production capacity is 400,000 tons per year.
Processing TRC with scrap aluminum cans, together with scrapped automotive scrap, may be the most economical way to produce high quality aluminum automotive panels. The price of used aluminum cans is usually less than 2/3 of the original aluminum ingots on the London Metal Exchange. TRRC can produce improved 5754 alloy properties using a large proportion of used aluminum cans.
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