Continuous and reversible copious cooling rolling process and equipment for preparing high-performance aluminum alloy strip for car
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A technology of aluminum alloy strip and rolling equipment, which is applied in metal processing equipment, metal rolling, metal rolling, etc., can solve the problems of high cost and restrictions on the application of aluminum alloy materials, and achieve the effect of high strength and toughness
Inactive Publication Date: 2018-07-20
CENT SOUTH UNIV
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Although the United States has successively produced all-aluminum vehicles in recent years, the cost of producing and manufacturing aluminum alloy sheets is still much higher than that of traditional steel, which
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Embodiment 1
[0035] Example 1, deep cold rolling of AA6061 aluminum alloy.
[0036] The first step: AA6061 aluminum alloy strip is used as raw material, and the thickness of the raw material is 3mm.
[0037] The second step: the AA6061 aluminum alloy strip is cooled with liquid nitrogen, so that the temperature of the strip is cooled to -196°C.
[0038] The third step: start rolling, and the rolling reduction rate is controlled at 15%.
[0039] Step 4: Repeat the second and third steps until the thickness of the rolled piece is reduced to 0.5mm.
[0040] After rolling, the microstructure of AA6061 aluminum alloy is as follows figure 2 As shown, the grain size distribution is between 200-400nm, and the tensile strength of the rolled piece reaches 370MPa.
Embodiment 2
[0041] Example 2, deep cold rolling of AA5020 aluminum alloy.
[0042] The first step: AA5020 aluminum alloy strip is used as raw material, and the thickness of the raw material is 5mm.
[0043] The second step: the AA5020 aluminum alloy strip is cooled with liquid nitrogen, so that the temperature of the strip is cooled to -196°C.
[0044] The third step: start rolling, and the rolling reduction rate is controlled at 15%.
[0045] Step 4: Repeat the second and third steps until the thickness of the rolled piece is reduced to 0.8mm.
[0046] After rolling, the microstructure of AA5020 aluminum alloy is as follows image 3 As shown, the average grain size is about 400nm, and the tensile strength of the rolled piece reaches 350MPa.
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Abstract
Provided is a continuous and reversible copious cooling rolling process for preparing a high-performance aluminum alloy strip for a car. A copious cooling box and a coiling machine are additionally arranged on the two sides of a reversible rolling mill, the aluminum alloy strip is kept under an ultralow-temperature condition all the time through the copious cooling box, the coiling direction of the coiling machine is adjusted, and continuous rolling preparation of the aluminum alloy strip is achieved. The invention further provides continuous and reversible copious cooling rolling process forpreparing the high-performance aluminum alloy strip for the car. Compared with a steel material, aluminum alloy has very excellent deformability. Meanwhile, in the ultralow-temperature plastic deformation process of the aluminum alloy, plastic strain promotes grains to be refined, dislocation motion is restrained by ultralow temperature, and the strength and toughness of the aluminum alloy are greatly improved. Compared with the prior art, the aluminum strip prepared through the method has higher strength and toughness compared with an aluminum alloy strip prepared through traditional cold rolling, the aluminum alloy is likely to be applied to the fields of car weight reducing and the like, especially light reducing of new energy cars.
Description
technical field [0001] The invention belongs to the technical field of metal strip rolling, and in particular relates to a continuous reversible cryogenic rolling process and equipment for preparing high-performance aluminum alloy strips for automobiles. Background technique [0002] As people pay more and more attention to environmental protection and energy conservation, lightweight has become one of the important directions for the development of the automobile industry. Especially in recent years, the new energy vehicle industry has developed rapidly. Due to factors such as the low energy density of batteries and the large weight of new energy vehicles (especially electric vehicles), in order to achieve a longer driving range, new energy vehicles have to reduce their weight. more prominent than conventional cars. If the weight of the car is reduced by 10%, the fuel consumption per 100 kilometers can be reduced by 6%, and the emission can be reduced by 4%. Compared with...
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