Processing method of aluminum flat ingot with ultra-high width-to-thickness ratio

Abstract

The invention discloses a processing method of an aluminum flat ingot with ultra-high width-to-thickness ratio. The method comprises the step that A, raw materials are put into a smelting furnace to be smelted, wherein the weight percentage of an original aluminum ingot is greater than or equal to 20%, the weight percentage of secondary waste is less than or equal to 30%, and the smelting temperature is 735-745 DEG C; B, an outlet section flowing passage of an aluminum filtering box and a flow dividing disc flowing passage are sprayed with boron nitride coatings; C, the flow dividing disc is preheated for 20-30 minutes; D, the molten aluminum flows out from the smelting furnace and passes through the filtering box and the flow dividing disc, the temperature of the molten aluminum enteringthe front end of the flow dividing disc is 695-705 DEG C, the molten aluminum enters the inner cavity of a crystallizer, the cooling water pressure of the crystallizer is 0.025-0.045 MPa, and the aluminum flat ingot with ultra-high width-to-thickness ratio is obtained after cooling crystallizing. The method has the advantages that the operation is simple and convenient, the width-to-thickness ratio of the prepared aluminum alloy flat ingot is greater than 4.8, the yield rate is significantly improved to reach up to 78-83%, and the marketing competitiveness of the product is effectively improved.

Description

Technical field [0001] The invention relates to the field of aluminum processing, in particular to a method for processing an ultra-high aspect ratio aluminum alloy flat ingot. Background technique [0002] For a long time, 2A12 aluminum alloy has the problem of difficulty in casting and forming when the aspect ratio is ≥4. The reason is that due to the casting characteristics of this type of alloy, after the molten aluminum is injected into the cavity of the mold, the molten aluminum in the middle of the cavity of the mold first contacts the large surface of the mold to cool, and the remaining molten aluminum flows toward the small surface of the mold frame. It is gradually cooled during the flow process, and the stress release of the aluminum ingot obtained by casting is not concentrated, which causes the large surface of the cast ingot to be cracked and cracks on the small surface. The scrap rate remains high, and the alloy yield rate is only 65-70%, which is seriously reduced...

AI Technical Summary

Problems solved by technology

[0002] For a long time, the 2A12 aluminum alloy has the difficulty of casting when the width-to-thickness ratio is ≥ 4

The reason is that due to the casting characteristics of this type of alloy, after the aluminum liquid is injected into the inner cavity of the mold, the aluminum liquid located in the middle of the mold inner cavity first contacts the large surface of the mold to cool, and the rest of the aluminum liquid flows towards the small surface of the mold frame. Gradually cooling during the flow process, the stress release of the cast aluminum ingot is not concentrated, resulting in cracks on the large surface and small surface of the cast ingot, the scrap rate remains high, and the alloy yield is only 65-70%, which is seriously reduced Enterprise benefit, dampen worker's enthusiasm

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