Dispensing – Molten metal dispensing – With subjacent flow guide
Patent
1986-03-27
1988-10-11
Rolla, Joseph J.
Dispensing
Molten metal dispensing
With subjacent flow guide
222591, 164337, B22D 4108
Patent
active
047765020
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention concerns a ceramic spout for the casting of metal melt.
Such a spout with a casing unaffected by changes of temperature and an inner inset made of erosion resistant, fireproof material has been known from the No. DE-A 21 65 537. The spout which is described there is used for the casting of metal melt from the intermediate receptacle (tundish) of an extrusion device into a casting drill. The thought underlying the invention and described in the German publication was based on the idea to offer a spout which would not be subject to an expansion in diameters of the spout. Such an expansion would otherwise have the following disadvantages: it would change the casting speed more or less uncontrollably, moreover the wear and tear at the outer edge of the spout would cause the casting stream to "flutter" and there would be the further disadvantage of an undesirable enlargement of the surface layer, which encourages O.sub.2 absorption. According to the No. DE-A-21 65 537 the casing consists of inexpensive, fireproof material, for example fire clay, while the more wear and tear resistant cylinders are to be made of zirconium oxide and materials high in alumina.
But when subjected to continuous casting of steel, such spout systems show substantial disadvantages.
As described in the essay by Hauck et al. (Arch. Metallurgy of Iron 53 (1982) 127ff) immersion spouts made of fire clay, graphite, silicondioxide and silicon carbide will show deposits on the inner surface of the spout material after a certain periodd of casting. These lead to a narrowing in the diameter of the immersion spout used for the casting practice, thus causing a continuous reduction of the amount that can be casted within a given period of time.
The same observations are made with immersion pipes designed with two components, as described in the No. DE-A-21 65 537.
The practice of adding Ca or CaSi alloys to the fluid steel has been described in the No. DE-A-27 31 367, which prevents the deposits on the surface of the immersion spout material, as described above. This elaborate procedure is cumbersome, though, and the aim, namely the prevention of the formation of deposits altogether, is not always achieved.
The invention is based on the task to suggest a ceramic spout, i.e. a casting device, through which metal melt can be conducted and which prevents erosions of the fireproof material and/or a deposit formation of hard, oxide phases. The spout, i.e. the entire casting device, is not only to be sufficiently wear and tear proof for the use in multiple sequence castings but also easily produceable and insertable.
For this purpose the invention intends a ceramic spout for the casting of a metal melt with an at least partial casing made of a material unaffected by changes of temperature and an inner inset made of erosion resistant, fireproof material, with casing and inset being arranged at a distance from one another and with the distance of the surfaces of the casing and the inset, which border on this space on two sides, bigger than or identical to the maximum thermal expansion of the corresponding materials of casing and inset during the actual employment. Preferably the space between the inner wall of the casing and the outer wall of the inset is at least partially filled with one or more materials which are combustible under volume reduction, when temperatures are below those which can be achieved in this space. By leaving a gap between the casing and the inset, i.e. by creating a space between the two parts, one takes into account the different thermal parameters of the employed fireproof materials, especially the various thermal expansions of the fireproof materials of the casing, and of the inset.
Thus, by chosing a fireproof material with higher thermal expansion for the inset, for example, mechanical tensions in the inset, i.e. contact joints, contact surfaces, between casing and inset can be avoided, since the inset material can freely expand and fill the space between the casing and the inset continuously. In or
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Hagenburger Klaus
Muller Ernst
Rosenstock Hans G.
Schattner Werner
Valentin Peter W.
A. Earley John F.
A. Earley III John F.
Chamotte- und Tonwerk Kurt Hagenburger
Pedersen Nils E.
Rolla Joseph J.
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