EP0913218B1 - Procédé et installation de coulée de bandes minces sur un ou entre deux cylindres - Google Patents
Procédé et installation de coulée de bandes minces sur un ou entre deux cylindres Download PDFInfo
- Publication number
- EP0913218B1 EP0913218B1 EP98402544A EP98402544A EP0913218B1 EP 0913218 B1 EP0913218 B1 EP 0913218B1 EP 98402544 A EP98402544 A EP 98402544A EP 98402544 A EP98402544 A EP 98402544A EP 0913218 B1 EP0913218 B1 EP 0913218B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channel
- roll
- channels
- rolls
- circulation
- Prior art date
- 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 - Lifetime
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Classifications
-
- 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
- B22D11/16—Controlling or regulating processes or operations
-
- 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
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- 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
- B22D11/0682—Accessories therefor for cooling the cast product during its passage through the mould surfaces by cooling the casting wheel
Definitions
- the invention relates to the continuous casting of metals in the form of strips. metallic by direct solidification of liquid metal on one or between two cylinders rotated.
- the cylinders used on the casting installations implementing this process generally consist of a core ensuring the mechanical resistance of the cylinder and its drive in rotation, and by a ferrule surrounding this heart.
- This ferrule is made a material that is a good conductor of heat, such as copper or one of its alloys. It's at its contact that the poured liquid metal should solidify, and it should therefore be energetically internally cooled.
- a cooling fluid generally water, flows under pressure inside channels drilled in the thickness of the shell, in parallel to the axis of the cylinder. These channels are connected at their ends to supply conduits and return formed, for example, in the heart of the cylinder.
- the channel section of cooling and their distribution in the shell are determined so as to ensure sufficient fluid flow to ensure sufficient heat extraction from the liquid metal, as well as a homogeneous distribution of the cooling on the around the cylinder.
- Such cylinders are described, in particular, in documents EP-A-0 428 464, EP-A-0 499 562 and EP-A-0 650 789.
- the cooling channels have a diameter of the order of 10 to 15 mm. This diameter can be increased, up to approximately 20 mm, if rods are inserted which, in reducing the useful section of these enlarged channels, make it possible to confine the flows in portions of the channels close to the outer surface of the shell.
- a diameter of the order of 10 to 15 mm can be increased, up to approximately 20 mm, if rods are inserted which, in reducing the useful section of these enlarged channels, make it possible to confine the flows in portions of the channels close to the outer surface of the shell.
- such an arrangement described in the document EP-A-0 499 562 makes it possible to increase the heat exchange surface between the fluid and the ferrule as well as the ease of drilling the channels, without requiring change the speed and flow of the coolant.
- the homogeneity of the cooling of the ferrule is all the better as the distance separating two neighboring channels is lower, therefore the number of channels is higher.
- the number of channels to be provided in the shell depends in particular on the diameter of the cylinder, which can be of the order of 500 to 1500 mm. In practice, a number of 100 to 200 channels is usual.
- Homogeneous cooling of the shell is a necessary condition for the tape is free from defects.
- the external surface of the shell present on the width of the cylinder an abnormally high temperature facing this channel.
- Solidification tape is not done as quickly as it should be, and this gives locally on the surface of the strip a brittleness which can cause the appearance of cracks cross. Blockage of a canal may occur due to progressive scaling of the channels if the cooling water is insufficiently demineralized, or of an accumulation of various impurities which it brought there.
- the object of the invention is to provide operators operating a machine continuous casting of bands on a cylinder or between two cylinders a means of controlling during casting the good condition of the cooling channels of each of the cylinders.
- the invention relates to a process for manufacturing thin strips metallic by solidification of liquid metal on the surface of a rotating cylinder or between the surfaces of two cylinders with horizontal axes rotated in opposite directions, the or said cylinders each comprising in the vicinity of their surface a multiplicity of channels through which a coolant flows, characterized in that, for each of said rotating cylinders, its temperature is punctually continuously measured surface in an area where its surface is in the open air, we determine the moments at which said measurement zone is opposite one of said channels, and from this measurement is deduced assessment of the quality of the circulation of said cooling fluid in said channel.
- the subject of the invention is also an installation for continuously casting strips metallic by solidification of liquid metal on the surface of a rotating cylinder or between the surfaces of two cylinders with horizontal axes rotated in opposite directions, the or said cylinders each comprising in the vicinity of their surface a multiplicity of channels traversed by a cooling fluid, characterized in that it comprises, for each of said cylinders, at least one instrument for continuously measuring its temperature surface in a point measurement area where said surface is in the open air, means for determining the moments at which said measurement zone faces one of said channels and to identify this channel, and means for deducing, from the measurements and previous determinations, information representative of the quality of the circulation of the cooling fluid in said channel.
- the invention consists in continuously measuring the temperature of the surface of the ferrule parading in front of a measuring instrument such as an optical pyrometer, to put the measurement at all times in relation to the angular position of the cylinder, and to give the possibility to warn operators when it is observed over several laps of consecutive cylinder an abnormally high temperature of the shell surface for a given angular position of the cylinder corresponding to the presence of a channel cooling below the measurement area.
- This high temperature is considered a partial or total blockage index of the cooling channel located opposite the zone of the ferrule concerned.
- the continuous casting installation of thin metal strips shown in the Figure 1 conventionally comprises two cylinders 1, 1 'with horizontal axes kept close from each other and rotated in opposite directions by means not shown.
- Their lateral surfaces 2, 2 ' fine, where they face each other, a sealed casting space 3 laterally by refractory walls 4 (only one of which is visible in FIG. 1) pressed against the ends of the cylinders 1, 1 '.
- Above the cylinders 1, 1 ' is a distributor 5 containing the liquid metal 6 to be cast, which is, for example, steel or copper.
- a pouring nozzle 7 brings the liquid metal 6 into the casting space 3 from distributor 5.
- solidified skins 11, 11 ′ of metal which, in the example shown (as is generally the case during steel casting), meet at neck 12, i.e. at the level where the cylinders 1, 1 'are closest to each other, to form a strip 13 fully solidified.
- a means is placed opposite each of the cylinders 1, 1 ' fixed point measurement of the surface temperature "T" of its shell 9, 9 'in an area where this ferrule 9, 9 'is exposed to the open air (i.e. it is not in contact with the metal), preferably mid-width of cylinder 1, 1 '.
- this means of temperature measurement can be constituted in particular by an optical pyrometer 14, 14 ' which has the advantage of practicing contactless measurement.
- a means of measuring the contact temperature, such as a thermocouple would theoretically be acceptable, but would have the disadvantage of wearing out during casting, or even deteriorating the surface of the ferrule 9, 9 '.
- the processing unit 15, 15 ′ stores the results of the measurements made during several consecutive turns. The alarm is only triggered if a temperature "T" deemed excessive (in absolute value, or by comparison with the temperatures "T” measured elsewhere during the same turn) below a channel 10, 10 'given a was observed during, for example, 5 consecutive rounds.
- the following table 1 illustrates by an example the form that data collection can take and the conclusions that it is possible to draw as to the advisability, at a given moment, of triggering an alarm signaling that a specific channel is obstructed in a durable and dangerous way for the good condition of the shell.
- the cylinder concerned has 200 channels; the data presented was collected during 7 consecutive rounds.
- Table 1 the temperatures deemed abnormally high according to this criterion and which can therefore contribute to the triggering of an alarm, are entered in bold type.
- operators can choose to interrupt the casting to avoid deterioration of the shell, especially since, as we have said, the blockages of cooling channels can lead to the appearance of faults prohibitions on the solidified strip which make it unnecessary to continue casting. If they have any the possibility, operators can also launch actions to try to unblock the concerned channel (s), for example a large and sudden increased coolant pressure.
- the processing units of data can be directly connected to the bodies allowing to control this unclogging action, so as to trigger them without operator intervention when they are necessary.
- the invention has been described in the case of its application to the casting of strips thin metal between two cylinders. But it is clearly transposable to case of the casting of metal strips on a single cylinder. Likewise, it can be applied to casting machines where the cooling channels would be provided not to inside the ferrule, but between the ferrule and the cylinder core, or even to machines where the cylinders would not have a separate ferrule from the heart, but a single part.
- the main thing is that the cylinder (s) have channels near their surface. fluid flow, and that the influence of each channel on the local surface temperature of the cylinder can be discriminated.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Radiation Pyrometers (AREA)
- Continuous Casting (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Metal Rolling (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Description
- la figure 1 qui montre schématiquement en coupe transversale une installation de coulée continue de bandes métalliques entre deux cylindres selon l'invention;
- la figure 2 qui montre des courbes représentatives d'un exemple de mesures de la température de surface d'un des cylindres, réalisées sur l'installation selon l'invention lors de deux tours consécutifs dudit cylindre.
- la température superficielle "T" de la virole 9, 9' dans la zone considérée a oscillé généralement autour d'une valeur moyenne Tmoy; elle était légèrement inférieure à Tmoy dans les zones situées sensiblement face à la plupart des canaux de refroidissement 10, 10' et légèrement supérieure à Tmoy entre lesdites zones; ces hétérogénéités tolérables de la température superficielle "T" de la virole 9, 9' sont dues à la plus ou moins grande distance des zones considérées par rapport aux canaux 10, 10';
- mais dans des zones encadrant l'aplomb des canaux de rang "n" et "n+3", la température "T" a pris une valeur nettement supérieure à Tmoy; cela est l'indice que dans ces deux canaux, la circulation du fluide de refroidissement ne s'effectuait plus normalement au moment de la mesure, à la suite d'un bouchage partiel ou total de leur section.
- que la température moyenne Tmoy autour de laquelle oscillait normalement la température superficielle "T" de la virole 9, 9' lors du tour de rang "x+1" n'a pas été très sensiblement différente de ce qu'elle était au tour de rang "x";
- que la température "T" mesurée à l'aplomb du canal de rang "n" a encore augmenté, et que face à des canaux voisins de rangs "n-1" et "n+1", la température "T" a commencé également à devenir anormalement élevée; cela est l'indice que dans l'espace de temps séparant les deux mesures, la circulation du fluide de refroidissement dans le canal de rang "n" ne s'est pas améliorée, et que l'effet de ce défaut dans le refroidissement de la virole 9, 9' se faisait sentir sur une plage de largeur croissante;
- et que la température "T" mesurée à l'aplomb du canal de rang "n+3" est revenue à une valeur plus proche de Tmoy; cela est l'indice que dans l'espace de temps séparant les deux mesures, la circulation du fluide de refroidissement dans le canal de rang "n+3" s'est améliorée, par exemple parce que les impuretés qui la gênaient lors du tour de rang "x" ont pu être entraínées par le courant de fluide refroidissant.
Claims (5)
- Procédé de fabrication de bandes minces métalliques par solidification de métal liquide sur la surface d'un cylindre en rotation ou entre les surfaces de deux cylindres à axes horizontaux mis en rotation en sens contraires, le ou lesdits cylindres comportant chacun au voisinage de leur surface une multiplicité de canaux parcourus par un fluide de refroidissement, caractérisé en ce que, pour chacun desdits cylindres en rotation, on mesure ponctuellement en continu sa température superficielle dans une zone où sa surface est à l'air libre, on détermine les moments auxquels ladite zone de mesure se trouve face à l'un desdits canaux, et on déduit de ladite mesure une appréciation sur la qualité de la circulation dudit fluide de refroidissement dans ledit canal.
- Procédé selon la revendication 1, caractérisé en ce qu'on déduit ladite appréciation sur la qualité de la circulation dudit fluide de refroidissement dans ledit canal à partir d'une pluralité de mesures de la température superficielle du cylindre à l'aplomb dudit canal réalisées lors de plusieurs tours consécutifs du cylindre.
- Installation de coulée continue de bandes métalliques (13) par solidification de métal liquide (6) sur la surface d'un cylindre en rotation ou entre les surfaces (2, 2') de deux cylindres (1, 1') à axes horizontaux mis en rotation en sens contraires, le ou lesdits cylindres (1, 1') comportant chacun au voisinage de leur surface (2, 2') une multiplicité de canaux (10, 10') parcourus par un fluide de refroidissement, caractérisé en ce qu'elle comporte, pour chacun desdits cylindres (1, 1'), au moins un instrument de mesure en continu de sa température superficielle dans une zone de mesure ponctuelle où ladite surface (2, 2') est à l'air libre, des moyens pour déterminer les moments auxquels ladite zone de mesure se trouve face à l'un desdits canaux (10, 10') et pour identifier ce canal (10, 10'), et des moyens (15, 15') pour déduire, à partir des mesures et des déterminations précédentes, des informations représentatives de la qualité de la circulation du fluide de refroidissement dans ledit canal (10, 10').
- Installation selon la revendication 3, caractérisée en ce que ledit instrument de mesure de la température superficielle du cylindre est un instrument de mesure sans contact tel qu'un pyromètre optique (14, 14').
- Installation selon la revendication 3 ou 4, caractérisée en ce que lesdits moyens (15, 15') pour déduire des informations représentatives de la qualité de la circulation du fluide de refroidissement dans ledit canal (10, 10') sont connectés à des moyens pour exécuter des actions visant à améliorer ladite circulation.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9713674A FR2770427B1 (fr) | 1997-10-31 | 1997-10-31 | Procede et installation de coulee de bandes minces metalliques sur un ou entre deux cylindres |
FR9713674 | 1997-10-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0913218A1 EP0913218A1 (fr) | 1999-05-06 |
EP0913218B1 true EP0913218B1 (fr) | 2002-08-07 |
Family
ID=9512873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98402544A Expired - Lifetime EP0913218B1 (fr) | 1997-10-31 | 1998-10-14 | Procédé et installation de coulée de bandes minces sur un ou entre deux cylindres |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0913218B1 (fr) |
AT (1) | ATE221808T1 (fr) |
DE (1) | DE69807025T2 (fr) |
DK (1) | DK0913218T3 (fr) |
ES (1) | ES2181145T3 (fr) |
FR (1) | FR2770427B1 (fr) |
PT (1) | PT913218E (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003055623A1 (fr) * | 2001-12-21 | 2003-07-10 | Nucor Corporation | Systeme modelise de determination de temperature de fonctionnement de rouleau lamineur dans un procede de coulee en bande mince |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102463328B (zh) * | 2010-11-08 | 2015-04-29 | 上海宝信软件股份有限公司 | 结晶辊状态监控装置 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5823545A (ja) * | 1981-07-31 | 1983-02-12 | Nippon Steel Corp | 溶融金属急冷法による薄帯板製造用冷却ロ−ルの表面温度制御法 |
JPS629755A (ja) * | 1985-07-06 | 1987-01-17 | Hitachi Zosen Corp | 薄板連続鋳造設備におけるツインロ−ル型モ−ルドの運転制御方法 |
FR2672523B1 (fr) * | 1991-02-13 | 1995-04-21 | Usinor Sacilor | Virole de cylindre de coulee continue. |
-
1997
- 1997-10-31 FR FR9713674A patent/FR2770427B1/fr not_active Expired - Fee Related
-
1998
- 1998-10-14 ES ES98402544T patent/ES2181145T3/es not_active Expired - Lifetime
- 1998-10-14 DE DE69807025T patent/DE69807025T2/de not_active Expired - Lifetime
- 1998-10-14 DK DK98402544T patent/DK0913218T3/da active
- 1998-10-14 PT PT98402544T patent/PT913218E/pt unknown
- 1998-10-14 AT AT98402544T patent/ATE221808T1/de active IP Right Revival
- 1998-10-14 EP EP98402544A patent/EP0913218B1/fr not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003055623A1 (fr) * | 2001-12-21 | 2003-07-10 | Nucor Corporation | Systeme modelise de determination de temperature de fonctionnement de rouleau lamineur dans un procede de coulee en bande mince |
Also Published As
Publication number | Publication date |
---|---|
DK0913218T3 (da) | 2002-11-18 |
FR2770427B1 (fr) | 1999-12-10 |
DE69807025D1 (de) | 2002-09-12 |
ATE221808T1 (de) | 2002-08-15 |
PT913218E (pt) | 2002-12-31 |
EP0913218A1 (fr) | 1999-05-06 |
FR2770427A1 (fr) | 1999-05-07 |
DE69807025T2 (de) | 2004-05-19 |
ES2181145T3 (es) | 2003-02-16 |
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