Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1997-10-17
2000-06-06
Pyon, Harold Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164 63, 164 65, 164472, B22D 1110, B22D 1107, B22D 2715
Patent
active
06070649&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF INVENTION
The invention is directed to a method for pouring a metal melt, especially steel, into a vertically oscillating mold via a tundish or intermediate vessel provided with an immersion nozzle to generate endless strands and to an apparatus required for practicing the method for casting metal strands, especially thin slabs of steel, wherein the intermediate vessel has an open first chamber and a closed second chamber. The metal melt is supplied from a casting ladle to the first chamber. The second chamber which is connected with a vacuum device. An immersion pipe, which projects into a mold which can be vertically oscillated, is provided in the base of the second chamber.
EP 0 410 273 discloses a receptacle with a first chamber which is open against atmospheric pressure and which serves to receive molten material and with a second chamber for discharging metal. The second chamber is connected with the first chamber via a wall provided with an opening. The second chamber is sealed and is connected to a vacuum device, so as to adjust a higher metal level in the second chamber than in the first chamber. An outlet, which is only mentioned but not described, and which can be closed by a valve is provided in the second chamber.
DE-OS 2017469 discloses an installation for the continuous casting of molten metal with a continuous casting mold having an intermediate vessel which is sealable in a gastight manner and can be evacuated. A vacuum pressure can be adjusted in the intermediate vessel so as to allow the metal to flow out of the outlet pipe into the mold in an essentially pressureless manner
The immersion casting pipe known from this reference is constructed in such a way that the metal jet still penetrates into the liquid pool or crater even when the velocity of the metal flowing out is further reduced by a funnel-shaped construction in the outlet region of the outlet pipe.
The object of the present invention is to provide a method and apparatus which enable the metal melt to be poured into the mold without turbulence and so as to be free of kinetic energy.
SUMMARY OF THE INVENTION
According to the invention, the hydraulic level of the supplied melt is adjusted and the melt exiting the intermediate vessel is supplied isokinetically to the liquid portion of the steel strand. The hydraulic level is adjusted to between 50 to 600 mm above the level of the melt in the mold by applying a vacuum pressure to an intermediate vessel having two chambers to the surface of the melt located in the second chamber, namely in an order of magnitude such that the level of the surface of the melt exposed to the atmosphere in the intermediate vessel is slightly above the level located in the mold.
In another embodiment, the hydraulic level is adjusted in such a way that the amount of melt flowing in is regulated via a closing member and the filament of flow in the immersion pipe always has a positive pressure.
The amount of liquid metal flowing in is adjusted in such a way that it corresponds to the drawn off amount of partially solidified strand. By means of this method, the casting jet, which would otherwise usually occur and which penetrates the liquid strand core, is prevented. In particular, this brings about the advantage that a completely level bath surface results which allows the mold lubricant to be introduced in an exact, uniform manner. Further, the strand shell is solidified in a uniform and undisturbed manner, which not only improves the surface, but also prevents the tendency toward break-out. Further, it is possible to cast strands with a large length-to-width ratio, since no unwanted transverse flow occurs within the mold.
The cross-sectional areas of the immersion pipe and mold are so selected that the annular surface which is openly exposed to the atmosphere has a constant width independent of the level. Steps for influencing the mold lubricant can be carried out in an advantageous manner. In particular, one such step consists in a simple heating of the mold lubricant and a specific mete
REFERENCES:
patent: 5547014 (1996-08-01), Bruckner et al.
patent: 5622218 (1997-04-01), Pedroza-Contreras
Dohring Wolfgang
Feuerstacke Ewald
Reichelt Wolfgang
Urlau Ulrich
Lin I.-H.
Mannesmann AG
Pyon Harold Y.
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