Dispensing – Molten metal dispensing – With subjacent flow guide
Reexamination Certificate
2000-06-22
2002-07-23
Kastler, Scott (Department: 1742)
Dispensing
Molten metal dispensing
With subjacent flow guide
C222S597000, C222S591000
Reexamination Certificate
active
06422436
ABSTRACT:
This invention relates to a refractory nozzle for use with a metallurgical vessel such as a bottom pour ladle or a casting box.
In foundries devices such as bottom pour ladles, casting boxes and the like are used extensively to pour molten metal into moulds; these devices, which will hereinafter be referred to simply as ladles are provided with a refractory nozzle in their bottom. The flow of molten metal through the nozzle is controlled by a refractory stopper in the interior of the ladle, the stopper being moved into and out of the nozzle aperture.
For a given mould, there is a correct nozzle outlet diameter and only a small range of suitable flow rates of metal into the mould as too great a flow rate can damage the mould while too slow a flow rate results in an unsatisfactory casting. The maximum rate of flow of the metal through the nozzle is determined by the outlet diameter of the nozzle and the depth or ferrostatic head of metal in the ladle, and lessens as the head of metal decreases. Thus problems can arise when, as is common, a number of different moulds have to be poured from a single ladle as if the flow rate is appropriate for the first mould then it is too small for later moulds.
A commonly adopted solution to this problem is to use a nozzle that is oversize for the initial pourings and to control the flow by means of the stopper. This practice is not entirely satisfactory as the use of oversize nozzles tends to produce unsatisfactory castings as does undue throttling of the metal flow by the stopper.
It is an object of the present invention to obviate or mitigate these problems.
The present invention is refractory nozzle comprising upper and lower members, the upper member having an axial passage comprising a mouth at its top end, a tapered bore, and an enlarged diameter section at its bottom end, and the lower member having a top fitting into the enlarged section, and a tapered bore the top end of which matches the bottom of the tapered bore of the upper member.
The present invention is also a bottom pour metallurgical vessel having a hole in its bottom, a nozzle as defined in the last preceding paragraph and means for securing the nozzle in position in the hole.
REFERENCES:
patent: 4037762 (1977-07-01), Ruckstuhl
patent: 4042207 (1977-08-01), Nehrlich et al.
patent: 4051589 (1977-10-01), Tinnes
patent: 5044533 (1991-09-01), King
patent: 5173199 (1992-12-01), Bruckner et al.
patent: 5310164 (1994-05-01), Rothfuss et al.
patent: 5397105 (1995-03-01), Soofi
patent: 5718415 (1998-02-01), Dainton
patent: 5766543 (1998-06-01), Dainton
patent: 0 388 387 (1990-09-01), None
patent: 2 332 831 (1977-06-01), None
Kastler Scott
Lahive & Cockfield LLP
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