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Sequential casting of metals having similar freezing ranges

一种金属、复合金属锭的技术，应用在铝和铝合金领域，能够解决合金组合困难等问题

Active Publication Date: 2011-06-29
NOVELIS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] While these techniques are effective, there are similar or more specifically overlapping solidification ranges (i.e., between the solidus and liquidus temperatures of the respective alloys) when attempting to cool certain alloy combinations, especially in the molten state. Difficulties may be encountered when combining alloys with an overlapping range of

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  • Sequential casting of metals having similar freezing ranges
  • Sequential casting of metals having similar freezing ranges
  • Sequential casting of metals having similar freezing ranges

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Embodiment Construction

[0023]The present invention may employ casting apparatus of the general type described, for example, in U.S. Patent Publication No. 2005 / 0011630, issued January 20, 2005, to Anderson et al., which is incorporated herein by reference. , but modified from what is described in this article. The present invention also relates to the techniques described in Wagstaff, US Patent No. 6,260,602 (also incorporated herein by reference).

[0024] It is well known that, unlike pure metals, metal alloys do not melt instantly when brought to a specific melting point or temperature (unless the alloy happens to have a eutectic composition). Conversely, when the temperature of the alloy is increased, the metal remains completely solid until the temperature reaches the alloy's solidus temperature, and then the metal enters a semi-solid state (a mixture of solid and liquid) until the temperature reaches the alloy's liquidus temperature , at which temperature the metal will be completely liquid. ...

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Abstract

A method and apparatus is disclosed for sequentially direct chill casting a composite ingot made of metals having similar freezing ranges. Poor adhesion between the layers and low reliability of casting are addressed by adjusting the position of secondary cooling (created by applying water streams to the emerging ingot) relative to the upper surfaces of the molten metal pools compared to the conventional positions of first application of the secondary cooling. This can be achieved by moving one or more walls of the mold (when the secondary cooling emanates from the bottom of such walls), or adjusting the height of the molten metal pools within the mold and moving cooled divider walls between the pools. The relative temperatures and conditions of the metals at positions where they meet at the metal interface may therefore be optimized.

Description

technical field [0001] The present invention relates to the casting of metals, especially aluminum and aluminum alloys, by direct chill (DC) casting techniques. More specifically, the invention relates to the co-casting of metal layers by direct chill casting including continuous solidification. Background technique [0002] Metal ingots are usually produced by direct chill casting of molten metal. This involves pouring molten metal into a mold with cooled walls, an open upper end and (after start-up) an open lower end. As the casting operation proceeds, the metal emerges from the lower end of the mold as a solid ingot, descends and elongates. In other cases, casting is done in a horizontal orientation, but the process is roughly the same. Solidification of the ingot emerging from the mold is facilitated and ensured by directing a stream of liquid coolant, typically water, onto the nascent ingot as it emerges from the mould. This is called "secondary cooling" of the ingo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/02
CPCB22D9/003B22D7/02B22D11/007B22D7/06B22D11/049
Inventor R.B.沃斯塔夫E.W.里弗斯W.J.芬顿J.布尔曼
Owner NOVELIS INC
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