| 摘要 |
The invention relates to a method of casting an ingot of an aluminium alloy comprising lithium, comprising the steps of: (a) preparing at least two molten aluminium based alloys in separate furnaces, a first alloy with a composition A which is free from lithium as purposive alloying element, and a second alloy with a composition B which comprises lithium as purposive alloying element; (b) transferring the first alloy via a metal conveying trough from the furnace to a casting station; (c) initiate the start of casting an ingot and casting the first alloy to a required length L1 of an ingot in the casting direction; (d) subsequently transferring the second alloy via a metal conveying trough from the furnace to the casting station while simultaneously stopping the transfer of the first alloy to said casting station; (e) casting the second alloy from an end surface of the cast first alloy at length L1 to an additional required length L2 in the casting direction; (f) cropping the cast ingot at a bottom thereof at a length that is greater than of equal to the cast length L1. |
