Differential-temperature rolling method for AlZnMgCu-series aluminum alloy thick plates

Abstract

The invention discloses a differential-temperature rolling method for AlZnMgCu-series aluminum alloy thick plates, and the method is suitable for producing the AlZnMgCu-series aluminum alloy thick plates with thicknesses of 60-120 mm; The differential-temperature rolling method comprises the following steps of: firstly, rolling cast ingots to 180-240 mm by adopting common hot-rolling; cooling surface layers of rolled plates by a spraying mode, and reducing the temperatures of the surface layers of the hot-rolled plates to 300-400 DEG C, wherein the temperatures of the core parts of the hot-rolled plates are higher than those of the surface layers by 50-100 DEG C; and finally, rolling the hot-rolled plates to target thicknesses by adopting large rolling reduction. The method is used for changing deformation resistance of the surface layers and the core parts by utilizing temperature difference between the surface layers of the hot-rolled plates and the core parts of the hot-rolled plates, enables deformation of the surface layers and the core parts of the hot-rolled plates to be uniform, and improves uniformity of the thick plates. The method is simple and convenient to operate, andhas a practical industrial production application value.

Description

technical field [0001] The invention relates to a rolling method of aluminum alloy, which belongs to the field of non-ferrous metal materials and thermal processing thereof. Background technique [0002] Due to its comprehensive advantages in manufacturing cost, structural weight reduction and formability, aluminum alloy structural parts are widely used in important lightweight overall structures such as aviation, aerospace, navigation and transportation, and are trending towards large-scale integration With the development, the thickness requirements for aluminum alloy sheets are getting higher and higher. With the increase of plate thickness requirements, during the hot rolling process, the stress on the core of the thick plate is much smaller than that on the surface, so the thermal deformation of the core of the thick plate is much smaller than that of the surface. After hot rolling, solution quenching, and aging treatment of aluminum alloy ingots, the performance inhom...

AI Technical Summary

Problems solved by technology

In order to improve the uniformity of rolling, researchers have proposed the method of increasing the reduction in passes and the method of dragon-shaped rolling, but these two methods have very high requirements on equipment and are only suitable for thick plates with thinner thickness.

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