EP0084335B1 - Apparatus for quenching molten metal or an alloy on a belt - Google Patents

Apparatus for quenching molten metal or an alloy on a belt Download PDF

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Publication number
EP0084335B1
EP0084335B1 EP19830100114 EP83100114A EP0084335B1 EP 0084335 B1 EP0084335 B1 EP 0084335B1 EP 19830100114 EP19830100114 EP 19830100114 EP 83100114 A EP83100114 A EP 83100114A EP 0084335 B1 EP0084335 B1 EP 0084335B1
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EP
European Patent Office
Prior art keywords
strip
belt
box
alloy
liquid
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19830100114
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German (de)
French (fr)
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EP0084335A2 (en
EP0084335A3 (en
Inventor
Pascal Fournier
Jean-Claude Peraud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pont a Mousson SA
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Pont a Mousson SA
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Publication date
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Publication of EP0084335A2 publication Critical patent/EP0084335A2/en
Publication of EP0084335A3 publication Critical patent/EP0084335A3/en
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Publication of EP0084335B1 publication Critical patent/EP0084335B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/068—Accessories therefor for cooling the cast product during its passage through the mould surfaces
    • B22D11/0685—Accessories therefor for cooling the cast product during its passage through the mould surfaces by cooling the casting belts

Description

La présente invention concerne la technique d'hypertrempe, sur bande, selon laquelle un jet liquide du produit à hypertremper- métal ou alliage -est projeté sur une bande mobile, généralement métallique, défilant à grande vitesse, au contact de laquelle ce jet est soumis à un refroidissement très brutal (1 O6° C/s), et amené à l'état de ruban mince.The present invention relates to the hyper-soaking technique, on a strip, according to which a liquid jet of the hyper-soaking product - metal or alloy - is projected onto a moving strip, generally metallic, traveling at high speed, in contact with which this jet is subjected. very brutal cooling (1 O 6 ° C / s), and brought to the state of thin tape.

Pour que l'opération puisse se dérouler en continu, il convient d'assurer constamment l'élimination de la chaleur cédée à la bande mobile par le produit à traiter. Sans précaution spéciale, en effet, cet apport de chaleur provoque un rapide échauffement de la bande, au détriment de la qualité du produit obtenu, et entraîne très rapidement l'arrêt de la production, par collage du ruban sur la bande.In order for the operation to be able to take place continuously, it is necessary to constantly ensure the elimination of the heat transferred to the moving belt by the product to be treated. Without special precautions, in fact, this addition of heat causes rapid heating of the strip, to the detriment of the quality of the product obtained, and very quickly results in the stopping of production, by bonding the ribbon to the strip.

Divers procédés ont déjà été proposés pour effectuer le refroidissement de la bande, et le brevet US-A-4221257 en illustre un. Plus particulièrement, certains procédés utilisent des fluides froids injectés sur la bande, par exemple au moyen de caissons à coussins gazeux à effet Coanda.Various methods have already been proposed for cooling the strip, and US-A-4221257 illustrates one. More particularly, certain methods use cold fluids injected onto the strip, for example by means of gas cushion boxes with Coanda effect.

Ces procédés nécessitent cependant des dispositifs de grand encombrement, dès que les débits de produits à hypertremper deviennent importants.These methods, however, require large devices, as soon as the flow rates of products to be soaked become high.

Pour éviter cet inconvénient, la présente invention fait appel à la projection de liquide pulvérisé en fines gouttelettes sur la bande mobile, ce liquide étant avantageusement de l'eau.To avoid this drawback, the present invention calls for the projection of liquid sprayed into fine droplets on the moving strip, this liquid advantageously being water.

La présente invention a par conséquent pour objet un dispositif pour l'hypertrempe d'un métal ou d'un alliage métallique selon le préambule de la revendication 1 qui est caractérisé en ce que lesdits moyens de pulvérisation sont dirigés vers la face de la bande opposée à celle sur laquelle est projeté le métal ou l'alliage à l'état liquide, et qu'il comprend en outre, au niveau de la zone où est effectuée la pulvérisation, un caisson apte à produire un coussin gazeux à effet Coanda, et, en aval desdits moyens de pulvérisation, des moyens d'évacuation du liquide pulvérisé excédentaire, ledit caisson s'étendant au moins jusqu'à la zone desdits moyens d'évacuation.The present invention therefore relates to a device for the hyper quenching of a metal or a metal alloy according to the preamble of claim 1 which is characterized in that said spraying means are directed towards the face of the opposite strip. to that on which the metal or alloy is sprayed in the liquid state, and that it also comprises, at the level of the zone where the spraying is carried out, a box capable of producing a gas cushion with Coanda effect, and , downstream of said spraying means, means for evacuating the excess sprayed liquid, said box extending at least as far as the zone of said evacuation means.

Cette technique, bien connue dans d'autres domaines, exige, dans le cas considéré, l'observation d'un certain nombre de précautions.This technique, well known in other fields, requires, in the case under consideration, the observation of a certain number of precautions.

En effet, les essais effectués par les inventeurs ont montré que, si la surface de la bande mobile qui se présente sous le jet liquide chaud porte des traces d'eau, celle-ci se vaporise au contact du jet, donnant lieu à un phénomène de caléfaction, qui perturbe le contact entre produit et bande et, par conséquent, la formation du ruban hypertrempé. Or on a constaté aussi que, si la surface de la bande a été mouillée, lors de la pulvérisation visant à son refroidissement, il est très difficile de la sécher avant qu'elle ne se présente à nouveau sous le jet liquide chaud, c'est-à-dire en un temps très court (par exemple de l'ordre du dixième de seconde pour une bande de 4 m de longueur entraînée à une vitesse d'environ 30 m/s). De plus, cette même surface doit évidemment être maintenue protégée au maximum contre l'oxydation pour conserver ses qualités dans le processus d'hyper- trempe.In fact, the tests carried out by the inventors have shown that, if the surface of the moving strip which is present under the hot liquid jet carries traces of water, the latter vaporizes on contact with the jet, giving rise to a phenomenon of caulking, which disrupts the contact between product and strip and, consequently, the formation of the hyper-soaked tape. However, it has also been found that, if the surface of the strip has been wetted, during the spraying aimed at cooling it, it is very difficult to dry it before it appears again under the hot liquid jet, it that is to say in a very short time (for example of the order of a tenth of a second for a strip of 4 m in length driven at a speed of about 30 m / s). In addition, this same surface must obviously be kept protected as much as possible against oxidation to preserve its qualities in the hyperhardening process.

Selon l'invention, on effectue donc la pulvérisation d'eau sur la face de la bande opposée à celle sur laquelle on réalise le contact avec le produit à traiter.According to the invention, water spraying is therefore carried out on the face of the strip opposite to that on which contact is made with the product to be treated.

Il est d'ailleurs possible de régler le débit du ou des pulvérisateurs de telle manière que la température de la bande ne soit pas abaissée au-dessous de la température d'ébullition du liquide pulvérisé (100° C dans le cas de l'eau), et donc que la bande ne soit pas «mouillée», les raclettes et brosses servant alors essentiellement pendant la phase de réglage, puis jouant seulement un rôle de sécurité.It is also possible to adjust the flow rate of the sprayer (s) so that the temperature of the strip is not lowered below the boiling point of the sprayed liquid (100 ° C in the case of water ), and therefore that the strip is not "wet", the squeegees and brushes then being used essentially during the adjustment phase, then playing only a safety role.

Enfin, pour l'élimination des dernières traces du liquide de refroidissement, on a également utilisé avec succès une boîte à vide, disposée en aval des autres moyens d'évacuation (raclettes et brosses) et du coussin à effet Coanda sur lequel ceux-ci prennent appui. Cette boîte à vide comporte deux fentes de section très voisine de celle de la bande permettant le passage de celle-ci avec une rentrée d'air très faible.Finally, for the removal of the last traces of the coolant, a vacuum box was also successfully used, arranged downstream of the other means of evacuation (squeegees and brushes) and of the Coanda effect cushion on which these take support. This vacuum box has two slots with a cross-section very close to that of the strip allowing the passage of the latter with a very low air intake.

En outre, avantageusement, l'ensemble de l'installation de refroidissement est disposé à l'intérieur d'une enceinte sous légère dépression, évitant les projections de liquide de refroidissement et les émissions de vapeur vers la zone de coulée.In addition, advantageously, the entire cooling installation is placed inside an enclosure under slight depression, avoiding splashes of coolant and vapor emissions towards the casting zone.

L'invention fournit ainsi un dispositif permettant un réglage très fin de la température de la bande, qui s'avère être un paramètre particulièrement critique de l'hypertrempe, une température optimale de bande apparaissant pour chaque produit à fabriquer, tous autres paramètres étant maintenus inchangés.The invention thus provides a device allowing a very fine adjustment of the temperature of the strip, which proves to be a particularly critical parameter of the hyperhardening, an optimum temperature of strip appearing for each product to be produced, all other parameters being maintained. unchanged.

Le dessin schématique annexé illustre uneforme de réalisation d'un dispositif d'hypertrempe conforme à l'invention.The appended schematic drawing illustrates an embodiment of a hyperhardening device according to the invention.

Ce dispositif comprend une bande 1 en acier entraînée à grande vitesse (environ 40 m/s) sur deux poulies 2, 2', dont l'une est motrice, de préférence la poulie aval 2', dans le sens d'avancement du brin supérieur 1 a de la bande, afin de maintenir celui-ci parfaitement tendu. Le ruban hypertrempé 3 est formé sur la face supérieure du brin supérieur 1 a de la bande 1, par projection d'un produit à hypertremper, à partir d'un creuset 4 en un produit réfractaire tel que de la silice comportant un orifice d'éjection 5.This device comprises a steel strip 1 driven at high speed (about 40 m / s) on two pulleys 2, 2 ', one of which is powered, preferably the downstream pulley 2', in the direction of advance of the strand upper 1 a of the strip, in order to keep it perfectly taut. The hyper-dipped tape 3 is formed on the upper face of the upper strand 1 a of the strip 1, by projection of a product to be hyper-dipped, from a crucible 4 into a refractory product such as silica comprising an orifice eject 5.

Au voisinage de la zone d'impact dudit produit et, dans le cas du dessin, en regard de la face de la bande opposée audit impact, est disposé un premier caisson à effet Coanda 6 assurant notamment le maintien en position de la bande. Ce caisson présente, contre la bande, une surface plane percée de trous alignés selon l'axe de la bande et régulièrement espacés.In the vicinity of the impact zone of said product and, in the case of the design, opposite the face of the strip opposite to said impact, a first Coanda effect box 6 is arranged, ensuring in particular that the strip is held in position. This box has, against the strip, a flat surface pierced with holes aligned along the axis of the strip and regularly spaced.

Le dispositif de refroidissement par pulvérisation d'eau proposé par l'invention est disposé, dans la version représentée par le dessin, au niveau du brin inférieur 1 b de la bande.The water spray cooling device proposed by the invention is arranged, in the version represented by the drawing, at the level of the lower strand 1b of the strip.

Ce dispositif comporte, placé en regard de la face inférieure de ce brin, un second caisson 11 à effet Coanda, de géométrie analogue à celle du caisson 6. Les orifices des deux caissons sont alimentés en air comprimé.This device comprises, placed opposite the underside of this strand, a second box 11 with Coanda effect, of geometry similar to that of box 6. The orifices of the two boxes are supplied with compressed air.

Un pulvérisateur 12 d'eau est disposé en regard de la face supérieure du brin inférieur 1 b de la bande, au-dessus du caisson 11 et au voisinage de son extrémité «amont» (par rapport au mouvement de la bande).A water sprayer 12 is arranged opposite the upper face of the lower strand 1b of the strip, above the box 11 and in the vicinity of its “upstream” end (relative to the movement of the strip).

Il comporte deux buses concentriques, l'une, centrale, pour l'amenée du liquide à pulvériser, et l'autre, annulaire, pour l'air comprimé.It has two concentric nozzles, one, central, for the supply of the liquid to be sprayed, and the other, annular, for compressed air.

En aval du pulvérisateur 12 sont disposées deux raclettes 13 en caoutchouc dur, présentant une surface plane contre la bande.Downstream of the sprayer 12 are arranged two scrapers 13 of hard rubber, having a flat surface against the strip.

A la place de ces raclettes 13 ou en plus, de préférence en aval, une brosse cylindrique rotative 14, tournant dans le sens de la flèche f, complète l'essorage de la bande.In place of these squeegees 13 or in addition, preferably downstream, a rotary cylindrical brush 14, rotating in the direction of the arrow f, completes the spinning of the strip.

L'ensemble de ces organes est avantageusement disposé sous une hotte 15 avec aspiration, dont la jupe vient se raccorder sur le plateau du caisson.All of these members are advantageously placed under a hood 15 with suction, the skirt of which is connected to the tray of the box.

Il est avantageux, en outre, de disposer en aval des raclettes 13, de part et d'autre de la bande, des caissons 16 sous dépression, comportant des fentes ou ouïes disposées à proximité immédiate des rives de la bande, de manière à aspirer l'eau évacuée vers les bords de la bande par les raclettes 13.It is advantageous, moreover, to have downstream of the squeegees 13, on either side of the strip, boxes 16 under vacuum, comprising slots or openings arranged in the immediate vicinity of the edges of the strip, so as to suck the water discharged towards the edges of the strip by the squeegees 13.

A titre d'exemple, on décrit ci-après un dispositif de ce type dans lequel la bande 1 a une longueur de 4 m et une section de 13 x 0,8 mm. Cette bande est entraînée par la poulie 2' à une vitesse d'environ 40 m/s.By way of example, a device of this type is described below in which the strip 1 has a length of 4 m and a section of 13 x 0.8 mm. This strip is driven by the pulley 2 'at a speed of around 40 m / s.

La surface plane du caisson 6 tournée vers la bande 1 a une longueur de 50 cm et une largeur de 10 cm. Elle est percée de trous d'un diamètre de 1,5 mm, alignés selon l'axe de la bande, avec un espacement de 25 mm. Ces trous sont alimentés en air sous pression avec un débit d'environ 10 m3/h normaux.The flat surface of the box 6 facing the strip 1 has a length of 50 cm and a width of 10 cm. It is pierced with holes with a diameter of 1.5 mm, aligned along the axis of the strip, with a spacing of 25 mm. These holes are supplied with pressurized air with a flow rate of approximately 10 m 3 / h normal.

Le caisson 11 a une géométrie identique à celle du caisson 6 et est alimenté en air dans les mêmes conditions.The box 11 has a geometry identical to that of the box 6 and is supplied with air under the same conditions.

La brosse rotative 14 a un diamètre égal à 100 mm.The rotary brush 14 has a diameter equal to 100 mm.

Ce dispositif a notamment été utilisé pour fabriquer un ruban'd'un alliage vitreux de formule: Fe75,6 C" P8 Crs Sio,4, dans les conditions suivantes:

  • - débit de l'alliage: 40 kg/h,
  • - température de l'alliage: environ 1200° C,
  • - distance du nez du pulvérisateur 12 à la bande 1:2 cm,
  • - débits d'alimentation du pulvérisateur 12, eau: environ 30 I/h, air comprimé: environ 10 m3/h normaux,
  • - raclettes 13: première raclette à environ 20 cm du pulvérisateur 12,
  • - alimentation des caissons 6 et 11 :10 m3/h normaux d'air comprimé pour chaque caisson,
  • - température de la bande (mesurée par pyrométrie infrarouge) : de préférence comprise entre 60 et 80° C.
This device has in particular been used to manufacture a ribbon ' of a vitreous alloy of formula: Fe 75 , 6 C "P 8 Crs Si o , 4 , under the following conditions:
  • - alloy flow: 40 kg / h,
  • - alloy temperature: around 1200 ° C,
  • - distance from the nose of the sprayer 12 to the strip 1: 2 cm,
  • - sprayer supply rates 12, water: around 30 l / h, compressed air: around 10 m 3 / h normal,
  • - squeegee 13: first squeegee about 20 cm from the sprayer 12,
  • - supply of boxes 6 and 11: normal 10 m 3 / h of compressed air for each box,
  • - strip temperature (measured by infrared pyrometry): preferably between 60 and 80 ° C.

Dans de telles conditions, avec une mise en régime très rapide et très stable, il a été possible d'obtenir un ruban d'alliage Fe75,6 C" P8 Cr5 Sio,4 amorphe ou à très faible taux de cristallisation, c'est-à-dire très correctement hypertrempé.Under such conditions, with a very rapid and very stable start-up, it was possible to obtain a strip of alloy Fe 75.6 C " P8 Cr 5 Si o , 4 amorphous or with a very low crystallization rate, that is to say, very properly soaked.

Claims (3)

1. Apparatus for the hypertempering of a metal or a metal alloy comprising a belt (1), driven at high speed, means (4, 5) for throwing the said metal or said alloy in the liquid state in the direction of this belt (1 ) and means (12) for spraying a cooling liquid in the direction of the belt (1), this apparatus being characterised in that the said spray means (12) are directed towards the face of the belt (1 ) opposite that onto which the metal or alloy is thrown in the liquid state and that it also comprises, in the vicinity of the region where the spraying is carried out, a box (11) able to produce a cushion of gas with a Coanda effect, and downstream of the said spray means (12), means (13, 14, 16) for the discharge of the excess sprayed liquid, the said box (11) extending at least as far as the region of the said discharge means (13, 14, 16).
2. Apparatus according to Claim 1, characterised in that the said means (13, 14, 16) for the discharge of the excess liquid are arranged below a suction hood (15) whereof the skirt is connected to the plate of the said box (11) able to produce a cushion of gas with a Coanda effect.
3. Apparatus according to Claim 1, characterised in that it comprises, downstream of the said means (13,14,16) for the discharge of the excess liquid, a vacuum box comprising two slots of section very close to that of the belt (1 ), for the passage of the latter.
EP19830100114 1982-01-18 1983-01-08 Apparatus for quenching molten metal or an alloy on a belt Expired EP0084335B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8200664A FR2519891A1 (en) 1982-01-18 1982-01-18 METHOD AND DEVICE FOR QUICK-BURNING THE BAND OF A METAL OR A LIQUID METAL ALLOY
FR8200664 1982-01-18

Publications (3)

Publication Number Publication Date
EP0084335A2 EP0084335A2 (en) 1983-07-27
EP0084335A3 EP0084335A3 (en) 1983-08-03
EP0084335B1 true EP0084335B1 (en) 1985-08-14

Family

ID=9270056

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Application Number Title Priority Date Filing Date
EP19830100114 Expired EP0084335B1 (en) 1982-01-18 1983-01-08 Apparatus for quenching molten metal or an alloy on a belt

Country Status (6)

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EP (1) EP0084335B1 (en)
JP (1) JPS58123833A (en)
BR (1) BR8300206A (en)
DE (1) DE3360531D1 (en)
ES (1) ES519037A0 (en)
FR (1) FR2519891A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2096365A1 (en) * 1992-06-23 1993-12-24 Donald G. Harrington Method and apparatus for continuous casting of metals
FR2700282B1 (en) * 1993-01-13 1995-03-03 Seva Method and installation for manufacturing amorphous metallic ribbons by hyper quenching.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH604970A5 (en) * 1974-11-01 1978-09-15 Erik Allan Olsson
JPS5928428B2 (en) * 1976-12-20 1984-07-12 古河電気工業株式会社 Foil metal tape manufacturing method
US4221257A (en) * 1978-10-10 1980-09-09 Allied Chemical Corporation Continuous casting method for metallic amorphous strips

Also Published As

Publication number Publication date
JPH0353060B2 (en) 1991-08-13
BR8300206A (en) 1983-10-11
JPS58123833A (en) 1983-07-23
FR2519891A1 (en) 1983-07-22
FR2519891B1 (en) 1984-10-26
ES8308734A1 (en) 1983-10-16
EP0084335A2 (en) 1983-07-27
DE3360531D1 (en) 1985-09-19
ES519037A0 (en) 1983-10-16
EP0084335A3 (en) 1983-08-03

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