A casting method for composite ingots

Abstract

The present invention relates to a method and apparatus for casting a composite metal ingot comprising at least two separate layers formed from one or more alloys, the method comprising: providing an elongated solid body composed of a first alloy A melt of a substrate and a second alloy; a casting mold is provided, the substrate and the casting mold are movable relative to each other, wherein the casting mold includes a melt supply for supplying the casting mold with molten second alloy and a belt There is an output end for casting the molten second alloy down onto the substrate at least one outlet at such a temperature that the casting mold and the substrate are continuously moved relative to each other through the at least one outlet. The molten second alloy is cast down onto the upper surface of the substrate at a temperature at which the substrate is locally at least partially remelted and at least partially mixed with the molten second alloy to form an alloy pool , after remelting, the pool of molten alloy continues to cool and solidifies at a location remote from the datum point and joins the substrate to form a composite ingot before exiting the casting mould.

Description

technical field [0001] The present invention relates to a method and an apparatus for casting a composite metal ingot comprising at least two layers each formed from one or more alloys. Background technique [0002] Metal ingots, especially aluminum ingots, have been manufactured for many years using a semi-continuous casting process known as direct chill casting or electromagnetic casting. In this process, molten metal is injected into the top of a bottomless mold and a cooling medium is applied directly to the solidifying surface of the metal as it is withdrawn. Such systems are often used to manufacture square ingots for the manufacture of rolled products such as aluminum alloy sheet. There is a large market for composite ingots consisting of at least two layers of different alloys. Such ingots are used for rolling to make clad plate for various applications such as brazing plate, aircraft plate, automotive clad plate and other uses where surface properties different fr...

AI Technical Summary

Problems solved by technology

[0003] The traditional way of obtaining such clad plates is to hot-roll join slabs of different alloys, thus joining them, for example by welding, and to subsequently roll them into the final product, which has the disadvantage that the interface between the slabs Often metallurgically unclean and layer to layer interbonding can be problematic