Dispensing – Molten metal dispensing – Flow controllers or assists
Reexamination Certificate
2000-02-04
2001-07-17
Kastler, Scott (Department: 1742)
Dispensing
Molten metal dispensing
Flow controllers or assists
C222S606000
Reexamination Certificate
active
06260742
ABSTRACT:
The present invention concerns a pouring spout for the transfer of a molten metal from a distributor into a continuous casting ingot mold, comprised of a body made up of a tubular part that delimits an essentially vertical pouring channel, and an essentially horizontal part that delimits a distribution channel, these two parts being assembled to each other, notably by being screwed together, the pouring channel having an upper end designed to be connected to the distributor and a lower end emptying into the distribution channel, the latter having at least two orifices emptying into the continuous-casting ingot mold, an obstacle being placed in the casting channel.
In the continuous casting of steel it is desirable for a number of reasons to assure a tranquil and regular flow of the metal into the ingot mold.
This is why a pouring spout of the above type was conceived (FR 2 739 313); it has an obstacle in the path with the molten metal that is designed to induce a deficiency in charging the stream of steel and thus to slow down this stream.
Such an arrangement presents numerous advantages. It reduces the cross section locally available for the passage of the molten metal. This has the effect of slowing down the rate of flow and improving the inner filling of the spout. The flow is thus rendered more regular. The symmetry of the flows in the right and left halves of the ingot mold and the regularity in time are notably improved.
However, this spout has a shortcoming. It is comprised of a tubular part at the lower end of which a hollow part, essentially in the form of an inverted T, is screwed. A perforated piece, which constitutes the obstacle for obtaining a charge deficiency placed in the path of the molten metal, is inserted between a shoulder or collar of the inverted T part and the lower end of the tubular part. Due to the improvement in internal filling, a quantity of steel accumulates above the perforated piece that forms the obstacle.
The thread that assembles the tubular part and the part in the form of an inverted T is then subjected to ferrostatic pressure. Since the threads are not tight, leaks are observed at its level. Even the addition of cement does not make the thread tight.
The object of the present invention is a spout that remedies this disadvantage. According to the invention, the spout has means for tightly retaining the molten metal upstream from the obstacle.
According to a first embodiment, the obstacle is formed in a single piece with the tubular part. Consequently, the joint is eliminated and the leaks are thus suppressed. According to a preferred embodiment, the part of the pouring channel located above the obstacle has a lining of a material different from that of the tubular part.
The obstacle can be made of the same material as the body or of a material different from the body.
According to a variant, the tight means of retention are comprised of a lining inserted into the pouring channel and integrating the obstacle. This lining should of course extend sufficiently high in the pouring charnel so its edges are above the maximum level of molten metal.
According to a preferred variant, the insert having a smaller obstacle of passage than the diameter of the pouring channel is provided in the upper part of the body.
REFERENCES:
patent: 3395831 (1968-08-01), Minteer, Jr.
patent: 4776502 (1988-10-01), Hagenburger et al.
patent: 5733469 (1998-03-01), Damasse et al.
patent: 1017923 (1977-09-01), None
patent: 492231 (1991-12-01), None
patent: 1295169 (1970-10-01), None
Caillaud Frederic
Hanse Eric
Richaud Johan
Kastler Scott
Vesuvius Crucible Company
Williams James R.
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