BE452405A

BE452405A -

Info

Publication number: BE452405A
Authority: BE
Priority date: 1942-09-24
Also published as: FR897494A

Description

       

  Mandrin pour la coulée continue de lingots tubulaires ou creux

  
Dans les dispositifs connus pour la coulée de lingots tubulaires ou creux sans fin, un tampon est placé dans le moule par la parfis inférieure de ce dernier, pour empêcher le métal li-

  
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plusieurs tenons, sur lesquels le métal, coule à l'état complètement fondu, peut se contracter afin que, après la solidification, il puisse 'être tiré sous forme de barre, à l'aide de cylindres

  
ou par un moyen analogue. Le creux de la barre sans fin tubulaire ou creuse obtenue de cette manière, :est formé dans ce. cas par un mandrin, le plus souvent conique, qui est placé concentriquanent dans le moule soit déjà avant le commencement de la coulée, de sorte que la matière à couler est versée seulement dans l'espace annulaire entre le mandrin et la paroi intérieure de la coquille, soit seulement peu après le commencement de la coulée. Dans ce dernier cas on coule d'abord un tronçon massif de courte longueur,

  
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creux. Le mandrin reste alors dans cette position pendant la. coulée continue du tube.

  
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non réfrigérés que des mandrins réfrigérés. Pour les derniers il

  
y a grand danger que la matière coulée se contracte par solidification sur le mandrin, ce qui entraîne très facilement un arrachement du mandrin. Il en résulte un danger d'explosion, à savoir, lorsque le réfrigérant liquide entre en contact avec la matière coulée liqui de.

  
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réfrigérés. Mais puisqu' après l'introduction du mandrin il est, d'une part, nécessaire de faire immédiat'ement descendre la barre fin et que, d'autre part, la matière coulée liquide supplique étroitement sur le mandrin, il se forme dans le creux produit par suite de la descente de la barre et constituant le creux de cette dernière, un vide ou uns dépression qui peut atteindre une valeur telle que la matière coulée liquida fasse irruption, à travers

  
la croûte périphérique solidifie&#65533;, dans ou vers le creux de la barre.

  
La présente invention -empêche l'irruption du métal li-

  
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nière continue suivant le procédé de coulée de barres sans fin, après l'introduction du mandrin dans le tronçon massif encore li-

  
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  Mandrel for continuous casting of tubular or hollow ingots

  
In the known devices for the casting of endless tubular or hollow ingots, a stamp is placed in the mold through the lower part of the latter, to prevent the metal from releasing.

  
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several tenons, on which the metal flows in a completely molten state, can contract so that, after solidification, it can 'be pulled in the form of a bar, with the help of cylinders

  
or by analogous means. The hollow of the tubular or hollow endless bar obtained in this way,: is formed in this. case by a mandrel, usually conical, which is placed concentrically in the mold is already before the beginning of the casting, so that the material to be cast is poured only into the annular space between the mandrel and the inner wall of the casting. shell, or only shortly after the start of casting. In the latter case we first sink a massive section of short length,

  
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hollow. The mandrel then remains in this position during the. continuous casting of the tube.

  
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not refrigerated than refrigerated chucks. For the last he

  
There is a great danger that the cast material will contract by solidification on the mandrel, which very easily leads to tearing of the mandrel. This results in a danger of explosion, i.e., when the liquid refrigerant comes into contact with the liquid cast material.

  
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refrigerated. But since after the introduction of the mandrel it is, on the one hand, necessary to immediately lower the fine bar and, on the other hand, the liquid casting material demands tightly on the mandrel, it is formed in the hollow produced as a result of the descent of the bar and constituting the hollow of the latter, a vacuum or a depression which can reach a value such that the liquid poured material bursts, through

  
the peripheral crust solidifies &#65533;, in or towards the hollow of the bar.

  
The present invention-prevents the irruption of the metal li-

  
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continuous line following the endless bar casting process, after the insertion of the mandrel into the solid section still free.

  
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Claims

of a mandrel having one or more openings which establish <EMI ID = 7.1>

vention in the jet or the liquid weight, liquid metal

can also penetrate the chuck openings and can

solidify, these openings are usefully closed before the introduction of the mandrel and they are only opened when there is no more

danger of liquid casting material entering these openings

and solidifies there. This can be achieved most simply by

using a pad of clay or other suitable material

which can be removed from the opening at the appropriate time because a shock

or a push. But we can also use other means for this

the cast material.

Other characteristics and advantages of the invention

emerge from the description below, which explains, using the

accompanying drawing, an exemplary embodiment of the invention.

gne a foundry mold of known construction which is generally cooled with water, which is not indicated in the drawing.

The completely molten material is poured into the mold 9 of the

known manner and by known means, also not shown

which gradually becomes, and starting with a peripheral crust

solidifying in a relatively rapid manner, the bar 8 solidified over its entire cross section. To form the hollow 7

of the endless hollow bar 8, a mandrel 1 is introduced into the mold which has, according to the invention and conformed to the example

shown, a central perforation 2 extending from a

end to end, which is closed, before lowering the mandrel 1

in the jet or the liquid weight 6, by means of a buffer in

clay 5. To facilitate the placement of the pad 5, the end

lower hole of the mandrel can be shaped,

for example, suitable conical, as shown in figure 2

in 4. After the beginning of the continuous casting of the tube, which

is closely followed by the continuous lowering of the tube bar

formed, the inserted tampon 5 is removed from the opening 4 by

a slight push using a metal wire, which prevents

- as long as the bar is still closed - the formation of a depression in the hollow 7 formed in said bar and,

starting, an irruption of the jet or the liquid weight 6 towards

or in the recess 7 of the bar. Instead of a single perforation

one can naturally also provide several. No matter

that these pressure compensating openings lead to the air

external or to a pressurized fluid reservoir, provided that they

prevent the establishment of a depression in the hollow of the

bar, which could cause the material to be poured to burst

liquid towards or in this hollow.

1. Mandrel for continuous casting of metal ingots

tubular or hollow according to the bar casting process without

end, intended to be introduced, only after the beginning of

casting continues, in the massive section still at

includes one or more pressure compensating openings.

2, - Casting process for tubular metal ingots

liquid monkfish and that it is opened again only after the beginning of the descent of the endless tube bar

tubular or hollow tubes according to the endless bar casting process and process for its use, in substance as described above with reference to the accompanying drawing