US 5,345,994 A · Casting metal strip

Abstract

Method and apparatus for casting metal strip in which molten metal is introduced between a pair of parallel casting rollers via a tundish and a metal delivery nozzle. Casting rollers are cooled so that shells solidify on the moving roller surfaces and are brought together at the nip between them to produce a solidified strip product at the roller outlet. The delivery nozzle comprises an elongate trough to receive molten metal and an outlet slot extending longitudinally along the bottom of the trough. The floor of the delivery nozzle is formed with an upwardly facing channel extending longitudinally of the trough in side by side relationship with the outlet slot. The channel merges smoothly at one of its sides with a side wall of the trough and rises at the other side above the root of the channel to the outlet slot. The side wall of the trough is disposed at an acute angle to the vertical and molten metal is supplied in free falling streams to impinge against and adhere to that side wall to form a sheet which flows smoothly downwards into the channel. The channel may be one of pair of similar channels dispose one to either side of the outlet slot.

Claims14

Dependent claims

Apparatus for casting metal strip comprising a pair of parallel casting rollers forming a nip between them and a metal delivery nozzle for delivering molten metal into the nip between the casting rollers, wherein the metal delivery nozzle comprises an elongate trough to receive molten metal, the floor of the trough comprises an upwardly facing channel and a nozzle outlet slot extending longitudinally of the trough in side by side relationship, the channel merges smoothly at one of its sides with a side wall of the trough and rises at its other side above the root of the channel to the outlet slot, said side wall of the trough is disposed at an acute angle to the vertical and the apparatus further comprises molten metal supply means to supply molten metal to the delivery nozzle in one or more falling streams so as to impinge against the side wall of the trough.

A method of casting metal strip from a pair of parallel casting rollers defining a nip therebetween comprising:

introducing molten metal into a delivery nozzle means disposed above said casting rollers, comprising an elongated trough adapted to receive said molten metal, disposed generally parallel to said nip of said casting rollers, which trough comprises:
an upwardly directed nozzle outlet slot means extending longitudinally of said trough at the floor of said trough;
an upwardly facing channel means at the floor of said trough extending longitudinally of said trough extending generally parallel to, and in side by side arrangement with said slot means, having:
a first channel side wall, directed towards said slot, extending higher than the base of said channel;
and
a second channel side wall, means directed away from said slot;
a first trough side wall extending smoothly upwardly from side of said nozzle outlet slot means disposed away from said channel means;
and
a second trough side wall extending upwardly from said second channel side wall means and outwardly in a direction away from said slot means;
impinging said molten metal onto said second trough side wall thereby forming a sheet of molten metal adhering to and flowing smoothly down said second trough side wall, said second channel side wall means, and thence into said channel means in an amount sufficient to overfill said channel means;
and
causing said molten metal to overflow said first channel side wall, between said channel and said slot, and thence to flow into said slot.

9 more elements

Dependencies are inferred from the claim text.

Casting metal strip

Life of this patent

Casting metal strip

Life of this patent

Abstract

Claims14