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Casting method for inhibiting bottom crack of ingot

An ingot and crack technology, applied in the field of aluminum alloy semi-continuous casting, can solve problems such as troublesome operation, achieve the effect of inhibiting cracking, reducing internal stress value and avoiding cracking tendency

Active Publication Date: 2010-03-17
CHINALCO MATERIALS APPL RES INST CO LTD
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Problems solved by technology

[0004] However, the use of pure aluminum bottom laying process not only requires additional equipment such as industrial pure aluminum melting furnaces, but also the operation of pure aluminum bottom laying casting is more troublesome. The success or failure of the bottom laying process is closely related to the cooperation of personnel and equipment

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Embodiment Construction

[0016] Aluminum alloy semi-continuous casting process generally includes three stages:

[0017] 1) The initial stage of casting: the aluminum alloy melt slowly flows into the casting mold composed of the crystallizer and the dummy ingot base through the launder, and solidifies under the joint cooling of the dummy ingot base and the inner wall of the crystallizer to form a thin metal shell. When the metal shell is strong enough to support the liquid metal, the dummy base is lowered, the solidified metal surface contacts the cooling water in the mold, and the semi-continuous casting process begins;

[0018] 2) Stable casting stage: At this stage, the casting process is carried out stably according to the requirements of alloy ingot casting. The casting machine continuously decreases according to the set value of casting speed, and the cooling water changes linearly with the casting speed according to the set process. The liquid level remains unchanged, and the melt temperature f...

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Abstract

The invention relates to a casting method for inhibiting bottom crack of an ingot. The numerical values of casting speed and cooling water flow in the initial stage of casting are both 1 / 2-2 / 3 of those of casting speed and cooling water flow in the stable stage, when the length of the ingot achieves 20-100mm, the cooling water flow is kept still, the casting speed gradually reduces to zero within1-10s, after the casting machine stops running for 1-60s, the casting process is restarted, the numerical values of casting speed and cooling water flow are gradually restored to the initial preset values, the casting speed gradually reduces to zero after the initial stage, the stable stage and the ending stage of the casting process, and the casting machine suspends once in the midway during thewhole casting process. The technical scheme can effectively reduce overall inner-stress value of the ingot, achieve the aim of inhibiting crack and improve casting success ratio.

Description

technical field [0001] The invention relates to a casting method for suppressing cracks at the bottom of an ingot, and belongs to the technical field of semi-continuous casting of aluminum alloys. Background technique [0002] Direct water-cooled semi-continuous casting is the main process for the preparation of aluminum alloy round ingots and slabs. In the semi-continuous casting process, bottom cracking is one of the common defects of ingots; before subsequent thermal deformation, in order to ensure product quality, the cracked cast The bottom of the ingot is cut off, which seriously reduces the yield of the product. However, for some aluminum alloy ingots with serious cracking tendency, the cracks at the bottom may even run through the entire ingot, resulting in the scrapping of the entire ingot product. The reason for the cracks at the bottom of the ingot is mainly due to the fact that the temperature of the casting tools (such as crystallizers, bases, etc.) is too low ...

Claims

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Application Information

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IPC IPC(8): B22D30/00B22D11/22
Inventor 郭世杰王家淳刘金炎陈九一
Owner CHINALCO MATERIALS APPL RES INST CO LTD
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