A kind of magnesium alloy slab ultrasonic casting and rolling method

Abstract

An ultrasonic cast-rolling method for a magnesium alloy slab comprises the following steps: alloy smelting; melt conveying; slab cast-rolling; ultrasonic vibrating; and slab reeling. The method is characterized in that ultrasonic probes are arranged inside rollers and located in a position close to the melt conveying side of the cast-rolling area; and the ultrasonic probes are arranged inside both an upper roller and a lower roller. According to the method, power ultrasonic probes are applied onto the inner walls of the annular rollers; an ultrasonic out-field is enabled to directly react on a position of a cast-rolling solidification front; the effect for power ultrasound of refining and homogenizing the structure of the cast-rolling slab can be improved remarkably; the distribution uniformity of solutes is improved; the quality of slab casting metallurgy is improved; the core part of an original cast-roller is minished; the weight of the roller is reduced remarkably; the energy consumption of cast-rolling transmission can be reduced; and a water-cooling mode is replaced with an air-cooling mode, so that a risk that a magnesium liquid explodes when meeting water due to fracturing of a sleeve of a roller is completely avoided, and the safety of industrial production is improved.

Description

technical field [0001] The invention belongs to the field of nonferrous metal processing, and in particular relates to an ultrasonic casting and rolling method of a magnesium alloy slab. Background technique [0002] Magnesium alloys have the advantages of light density, high specific strength and specific stiffness, and good electromagnetic shielding and damping properties. They have good application prospects in both military and civilian fields. High-performance magnesium alloy sheets are increasingly valued in the manufacturing field. However, magnesium alloy has a close-packed hexagonal crystal structure with low symmetry, few slip systems that can be activated at room temperature, and difficult deformation processing. The traditional magnesium alloy sheet preparation process is complicated and the processing cost remains high. Twin-roll casting and rolling technology has the advantages of short process, low energy consumption and high efficiency, which can significantl...

AI Technical Summary

Problems solved by technology

In the current magnesium alloy ultrasonic casting and rolling preparation method, the ultrasonic application position is mostly placed in the front box and the position where the nozzle melt flows through, and there is still a distance from the solidification front of the alloy melt. When the ultrasonic wave reaches the solidification front, it has been greatly attenuated. It is difficult to give full play to the effect of ultrasonic external field on the improvement of the solidification structure of magnesium alloy cast-rolled slabs

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