Process for continuously casting magnesium alloy thin strip blank

Abstract

The continuously casting process of thin magnesium alloy strip plate includes the following steps: preheating and smelting alloy blank in melting furnace with flux; preheating the side sealing system to 400-450 deg c before casting, transferring the melt at 650-680 deg c to pouring basket and maintaining for 15-30 min under the action of flux, feeding via melt distributor to equal diameter double roller vertical continuous casting machine under the action of protective gas, casting in immersion mode and casting speed of 20-100m / min for casting-rolling, and feeding the strip plate from the casting rollers to the pinch rollers under protecting gas action. The cast thin magnesium alloy strip plate has thickness of 1.0-3.5mm. The present invention produces thin magnesium alloy strip plate directly with molten magnesium alloy, and has the advantages of high product quality, homogeneous inner structure, being favorable to subsequent processing, short technological process and low cost.

Description

technical field [0001] The invention belongs to the field of near-net-shape casting of non-ferrous metals, and in particular relates to an equal-diameter vertical twin-roller continuous casting with high production efficiency, good surface quality of the cast thin strip billet, uniform internal structure and favorable subsequent rolling processing. A process for machine-casting magnesium alloy thin strips. Background technique [0002] Magnesium alloy is a new type of light metal material. It is currently the lightest metal structure material in industrial applications. It has high specific strength, specific stiffness, good shock absorption and noise reduction, cutting processing, and electromagnetic shielding capabilities. It is used in aerospace , vehicles and 3C products have broad application prospects. At present, the demand for magnesium and magnesium alloys is growing at a rate of more than 20% per year, and has gradually developed into the third largest metal mater...

AI Technical Summary

Problems solved by technology

Since the horizontal twin-roll casting machine sends the magnesium alloy liquid between the rotating casting rolls arranged up and down through the casting nozzle, the contact area between the alloy liquid and the casting rolls is relatively short, generally 15-40mm; the liquid level is low, Generally 20mm; the casting speed is relatively slow, generally between 0.8 and 1.5m / min, although this process is easy to control, and can save the traditional production process of magnesium alloy thin strips, and realize near-net shape processing to prepare magnesium alloy plates Strip billet, but there are the following disadvantages: the short contact zone makes the formation of the solidified billet shell require a long cooling time; the horizontal double-roll method emphasizes the rolling effect of the casting roll, requiring a certain amount of rolling deformation; the upper and lower rolls The cooling effect is inconsistent, and the surface morphology of the liquid film on the upper and lower surfaces of the condensation zone is inconsistent, resulting in uneven quality of the upper and lower surfaces of the casting belt and internal structure

Therefore, the production efficiency is low, the cooling rate of the magnesium alloy strip blank is slow, the strip structure is uneven, and the performance is not good, which is not conducive to direct subsequent rolling processing

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