EP0998360B1 - Verfahren zum starten eines kontinuierlichen metall-giessprozesses - Google Patents

Verfahren zum starten eines kontinuierlichen metall-giessprozesses Download PDF

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Publication number
EP0998360B1
EP0998360B1 EP98935068A EP98935068A EP0998360B1 EP 0998360 B1 EP0998360 B1 EP 0998360B1 EP 98935068 A EP98935068 A EP 98935068A EP 98935068 A EP98935068 A EP 98935068A EP 0998360 B1 EP0998360 B1 EP 0998360B1
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EP
European Patent Office
Prior art keywords
stopper rod
control cylinder
casting
metal
level
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
Application number
EP98935068A
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English (en)
French (fr)
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EP0998360A1 (de
Inventor
Luc Vendeville
Yann Breviere
Georges Mercier
Gilles Fellus
Michel Abi Karam
Yves René LECLERCQ
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.)
Thyssen Stahl AG
USINOR SA
Original Assignee
Thyssen Stahl AG
USINOR SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thyssen Stahl AG, USINOR SA filed Critical Thyssen Stahl AG
Publication of EP0998360A1 publication Critical patent/EP0998360A1/de
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Publication of EP0998360B1 publication Critical patent/EP0998360B1/de
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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
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • 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
    • B22D11/161—Controlling or regulating processes or operations for automatic starting the casting process

Definitions

  • the present invention relates to continuous casting metals, including steel, and more particularly a method of starting the casting, from the situation where the casting plant is ready to receive the molten metal contained in a transport container such as a steelworks pocket.
  • Such an installation conventionally comprises a distributor equipped with a pouring nozzle and a mold.
  • the distributor also includes means shutter, called distaff, to shut off the nozzle and adjust the flow rate of molten metal during casting.
  • this mannequin Before the start of casting, a dummy is put in place in the installation, this mannequin has a dummy head which is inserted into the mold for shut it off temporarily at the start of casting, and stopper rod is placed in the closed position.
  • the metal of the ladle is spilled into the distributor.
  • a problem which arises is to define the moment when we are going to start the extraction, taking into account in particular the level required in ingot mold and time required for the product is sufficiently solidified before start the extraction.
  • the arrival of metal at the level required in the mold depends on the metal flow in the nozzle and therefore in particular of the open position of the distaff.
  • a level detector placed on the mold to regulate the flow rate or the extraction speed during casting, so as to maintain a substantially metal level constant in the mold during the entire casting.
  • these detectors can only be placed top of the mold. In addition, they have not conventionally a small detection distance and are positioned so that you can measure the level variations at near the setpoint level during casting. From this done, they only detect metal in an ingot mold when it approaches the setpoint level. So during almost the entire filling time of the mold, you can't control the metal level. Otherwise, when the detector can finally detect the presence of metal, and therefore order the start of the extraction, it takes a while before getting in speed, and the metal level may exceed largely the setpoint level. This can be in part avoided by simultaneously ordering the closure of the stopper rod to reduce the feed rate. But the reaction time of the stopper rod, the positioning is ensured by a jack, cannot be reduced enough to completely avoid the problem supra. In addition, the inertia of the metal flow and that of the means for controlling the stopper rod level fluctuations that can last for a some time before the regulation and therefore the level stabilize and the flow becomes regular.
  • document DE 3421344 describes a casting start process whereby for the purpose in particular to avoid parasitic solidifications at starting, and starting from a situation where the distaff is leaning on his seat, we proceed to a first maximum opening, then closing phase partial, and finally holding in the open position with possibly oscillations, to regulate the flow.
  • determining the position of the distaff is conventionally carried out by a device located on the control means of the distaff and not on the distaff itself. he it follows that the indication given by these measuring means is not exactly representative of the position of the distaff itself, this being due in particular to the games inevitable means of mechanical connection of the distaff to its control means. It follows that not only there is a time lag between the command to open the stopper rod and the start of the actual opening, and therefore the start of flow of the metal, but also, subsequently, the position indication distaff is not an exact reflection of its position effective, which determines the metal flow rate. Now, this is only by knowing the precise moment of the start of casting, and flow rate, which can be determined precisely the level in the mold during the filling.
  • the invention aims to solve the different aforementioned problems, and in particular to allow the precise determination of the start of casting time effective, and the flow rate during the filling the mold.
  • the object of the invention is a method of starting a casting operation continuous metal, in a casting installation comprising a distributor which includes a drain closable by a stopper rod coming to rest on a distaff seat, mechanical connection means between the stopper rod and a control cylinder displacement of the distaff, and an ingot mold receiving the metal flowing through said orifice.
  • the method according to the invention makes it possible to determine precisely when the molten metal will be able to start to flow between the stopper rod and its seat.
  • the operator actuates the control cylinder displacement of the distaff, before the start of the filling the distributor so as to press strongly the distaff on his seat. Therefore, it is practically impossible for the operator to know exactly when the distaff will end up in watertight limit position on his seat, when he goes operate the control cylinder in the other direction, since there is not an exact match between the position of the control cylinder and the position of the distaff.
  • the principle of the invention is in fact to restore artificially this correspondence, starting from the idea that if there is not an exact match of respective positions of the stopper rod and the cylinder command when the latter is actuated in one direction then in the other, however, we restore this correspondence if we only consider displacement in a sense, that of opening.
  • the controlled overclosure position is defined by a preset distance considered from the position of the control cylinder when it just causes the detachment of the stopper rod from its seat, i.e. the initialization position.
  • this initialization position of the control cylinder is not operator defined nor by any action on the said cylinder, but that it results solely from the forces of gravity acting on the installation and in particular on the stopper rod. It is so only the contact of the distaff on his seat, under the effect of its weight, which defines the position control cylinder initialization. We will therefore note that when determining the position initialization, it is the distaff which fixes the position of the control cylinder, while casting, it is obviously the control cylinder which fixes the position of the stopper rod.
  • the displacement of the jack leads to a displacement of the stopper rod, and therefore to the flow of the metal contained in the distributor, the flow rate of the molten metal being then regulated by acting on the cylinder, and depending on the position of said cylinder.
  • step c) push the distaff on its seat until the pushing force exerted by the means order value reaches a predetermined value.
  • control means push the distaff on its seat until control means reach a predetermined position.
  • the thrust exerted on the distaff before the introduction of molten metal into the dispatcher must be sufficient to guarantee a perfect sealing of the stopper rod on its seat, without risk that this seal is disturbed during filling the distributor.
  • this position of overclosure will be located beyond, in the direction of the closing, from the controlled over-closing position.
  • level regulation which regulates level as soon as the metal level comes close to the nominal level.
  • Level regulation well known in continuous casting facilities, is therefore put in service long before the metal level can be detected by the sensor, conventionally used in regulation systems. The regulation is however saturated so as to avoid that it tends to provoke an additional opening of the distaff (which would normally be the case since the metal level is then well below the normal level).
  • the control circuits being already in service before that the sensor detects the metal cast in the mold, the regulation intervenes without delay as soon as the level of metal is detected.
  • the reaction caused by said regulation when the cast metal comes close to the nominal level, is less lively and does not generate a sudden displacement of the stopper rod or sudden variation in the extraction speed.
  • the continuous casting installation shown in Figure 1, during casting, includes a distributor 1 containing molten steel 2, provided with an orifice drain 3 fitted with a nozzle 4.
  • the drain port 3 can be closed by a stopper 5 coming to rest on its seat 6.
  • the displacements of the distaff are carried out by a control cylinder 7, connected to the stopper 5 by mechanical connection means such as that an articulated lever 8 pivoting in a bearing 9.
  • the installation also includes, so known per se, an ingot mold 20 whose walls are energetically cooled to cool and solidify the molten metal poured into the mold by the nozzle 4.
  • the metal at least partially solidified in the form for example of a slab 21 is extracted from the mold down, at extraction roller means 22 driven in rotation by motors not shown.
  • the control cylinder 7 is equipped with a position 10, which continuously measures the exact position of the cylinder rod.
  • the installation furthermore comprises a regulation system 11, schematically represented in the drawing, and to which is also connected with a level 12 detector allowing detect and measure the level 23 of the metal in the mold.
  • the regulation system 11 is also connected to a solenoid valve 13, or equivalent control means, to control the movements of the jack 7, as well as motors of the extraction rollers 22 to adjust their speed.
  • control cylinder must obviously understand not only a cylinder conventional comprising a rod movable in translation in a cylinder body, such as the cylinder 7 shown in FIG. 1, but also any other actuator capable of ensuring the same displacement function of the stopper rod.
  • the graph in FIG. 2 shows, by way of example of the method according to the invention, the variations in the position d of the jack 7 as a function of time t, from an instant situated before the start-up process, until the arrival in normal casting regime.
  • Plot 31 corresponds to the position initialization "O" of the control cylinder, that is to say the measured position of the cylinder rod when the distaff 5 rests under the effect of its own weight on its seat 6.
  • the jack is then not subjected to any pressure by the solenoid valve 13, the position of the rod then being solely determined by the position of the stopper 5.
  • the weight of the distaff and that of the cylinder rod exert efforts on the lever 8 directed downward, and that, as a result, the games inevitable at all joints are located upwards for joints 51 and 61 of the distaff and cylinder rod on the lever as well as for the pivot joint 9 of the lever on installation.
  • the jack is then controlled so that its rod moves by a value dl, suitable for compensating for the various clearances indicated above and for strongly pressing the stopper rod on its seat.
  • This position is maintained throughout the filling of the metal distributor, as shown by the trace 32.
  • a cylinder position d 1 it is also possible to define a force or a pressure for supplying the cylinder , as already mentioned.
  • the actuator is then controlled to move its rod into the so-called controlled over-closing position (line 33 in Figure 2).
  • This position is defined by a distance d 2 from the initialization position.
  • This distance can for example be a predetermined percentage, for example 3%, of the total stroke of the jack. In practice, this distance will be determined experimentally so as not to be too great, but nevertheless sufficient for the stopper rod to remain firmly pressed on its seat and for no play to appear at the level of the various joints.
  • the precise start time t 1 will be determined by calculation as being the instant t 0 + ⁇ t, ⁇ t being the time taken for the cylinder rod to move by the distance d 2 .
  • the displacement of the jack will have released the pressure exerted by the stopper rod on its seat during the controlled over-closing phase, and will also have caught up with all the play in the joints, in the opposite direction to what had occurred during pressurizing the jack before filling the distributor.
  • the flow orifice therefore opens gradually, the progression of the opening being controlled by the displacement of the jack, which displacement continues to take place under the control of the law imposed, until a point defined by a distance d 3 , this distance d 3 being determined so as to correspond to a given opening of the stopper rod. It may be different from the maximum opening provided for the normal casting regime, which will only occur after the start of extraction. From time t 1 , the metal contained in the distributor therefore begins to flow into the ingot mold at a rate determined by the opening of the stopper rod, that is to say gradually increasing until the jack reaches position d 3 , then stabilizes at an imposed value while the mold continues to be filled (trace 35).
  • the flow of metal can therefore be different from the nominal flow under which metal will flow from the distributor into the ingot mold after starting the extraction rollers.
  • the level detector 12 that the level regulation, of a type known per se, takes the relay to control cylinder 7, as well as possibly the speed of the extractor rollers 22, to adapt the flow at extraction speed, so as to keep a substantially constant level of metal in the mold, as is well known.
  • the invention is not limited to the method of startup which has just been described only as example.
  • the method according to the invention can advantageously be implemented in continuous casting systems between cylinders.
  • position measurements can be performed by any other means of measurement capable of determining precisely the position of the control means of the distaff.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Forging (AREA)
  • Pinball Game Machines (AREA)
  • Examining Or Testing Airtightness (AREA)

Claims (5)

  1. Verfahren zum Einleiten eines Stranggiessvorgangs für Metalle in einer Giessanlage, die einen Verteiler (1) mit einer Ausflussöffnung (3) aufweist, welche durch einen Stopfer (5) verschliessbar ist, der sich auf einem Stopfersitz (6) abstützt, eine Anordnung (8) zur mechanischen Verbindung des Stopfers (5) mit einem Steuerzylinder (7) zur Verschiebung des Stopfers aufweist und eine Kokille (20) zur Aufnahme des aus der Ausflussöffnung ausfliessenden Metalls (2) aufweist,
    dadurch gekennzeichnet, dass vor dem Einleiten des Giessvorgangs:
    a) der Stopfer (5) auf seinen Sitz ausschliesslich unter der Einwirkung seines eigenen Gewichtes aufgesetzt wird, wobei der Steuerzylinder (7) deaktiviert ist und sich in einer Initialisierungsposition (31) befindet, die durch die Stellung des Stopfers bestimmt wird,
    b) die Initialisierungsposition des Steuerzylinders bestimmt wird,
    c) der Steuerzylinder in Schliessrichtung betätigt wird um den Stopfer auf seinen Sitz zu pressen,
    d) der Verteiler mit flüssigem Metall gefüllt wird,
    e) der Steuerzylinder betätigt wurd um ihn in eine Stellung (33) des gesteuerten Überschliessens zu bringen, die definiert ist durch einen vorgegebenen Abstand (d2) der Stellung des Steuerzylinders bezüglich der Initialisierungsposition und
    zum Einleiten des Giessvorgangs:
    f) der Steuerzylinder in Öffnungsrichtung betätigt wird nach einer vorbestimmten ihm auferlegten Vorschrift (34) der Verschiebung des Steuerzylinders als Funktion der Zeit, wobei der Zeitpunkt (t1) des Beginns des Giessvorgangs bestimmt wird ausgehend von dieser Vorschrift und unter Berechnung mittels dieser Vorschrift der Zeit, die benötigt wird, um den Steuerzylinder von der Stellung des gesteuerten Überschliessens (33) in die Initialisierungsposition zu überführen und
    g) die Betätigung des Steuerzylinders in Öffnungsrichtung fortgeführt wird, sodass das Metall in die Kokille fliessen kann.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass während des Schrittes c) der Stopfer auf seinen Sitz gepresst wird, bis die vom Steuerzylinder ausgeübte Presskraft einen vorgegebenen Wert erreicht.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass während des Schrittes c) der Stopfer auf seinen Sitz gepresst wird, bis der Steuerzylinder eine vorgegebene Stellung (32) erreicht.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass während des Einleitens des Giessvorgangs und nach dem Übergang des Steuerzylinders in die Initialisierungsposition der Öffnungsvorgang des Stopfers fortgesetzt wird bis zu einer Füllstellung (35), die unterhalb einer Stellung der vollständigen Öffnung liegt, wobei die Füllstellung während des Füllvorgangs der Kokille beibehalten wird.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass bevor die Höhe (23) des Metalls in der Kokille eine vorgegebene Sollhöhe für den Giessvorgang erreicht eine Steuerung der Höhe in Betrieb genommen wird, die die Steuerung der Höhe übernimmt, sowie die Höhe des Metalls die Nähe der Sollhöhe erreicht.
EP98935068A 1997-07-16 1998-07-01 Verfahren zum starten eines kontinuierlichen metall-giessprozesses Expired - Lifetime EP0998360B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9709241A FR2766113B1 (fr) 1997-07-16 1997-07-16 Procede de demarrage d'une operation de coulee continue des metaux
FR9709241 1997-07-16
PCT/FR1998/001401 WO1999003619A1 (fr) 1997-07-16 1998-07-01 Procede de demarrage d'une operation de coulee continue des metaux

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EP0998360A1 EP0998360A1 (de) 2000-05-10
EP0998360B1 true EP0998360B1 (de) 2002-09-25

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EP98935068A Expired - Lifetime EP0998360B1 (de) 1997-07-16 1998-07-01 Verfahren zum starten eines kontinuierlichen metall-giessprozesses

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US (1) US6374902B1 (de)
EP (1) EP0998360B1 (de)
JP (1) JP4224840B2 (de)
KR (1) KR100538966B1 (de)
CN (1) CN1086614C (de)
AT (1) ATE224783T1 (de)
AU (1) AU727961B2 (de)
BR (1) BR9811792A (de)
CA (1) CA2296743C (de)
CZ (1) CZ288868B6 (de)
DE (1) DE69808299T2 (de)
DK (1) DK0998360T3 (de)
ES (1) ES2184303T3 (de)
FR (1) FR2766113B1 (de)
MX (1) MXPA00000553A (de)
PL (1) PL186661B1 (de)
PT (1) PT998360E (de)
RO (1) RO120463B1 (de)
RU (1) RU2216430C2 (de)
SK (1) SK285291B6 (de)
TR (1) TR200000104T2 (de)
TW (1) TW375540B (de)
UA (1) UA59406C2 (de)
WO (1) WO1999003619A1 (de)
ZA (1) ZA986185B (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2843056B1 (fr) * 2002-07-31 2004-09-03 Realisations Tech Sert Soc Et Procede de demarrage automatique d'une installation de coulee continu et ensemble pour la mise en oeuvre de ce procede
US8440021B2 (en) * 2007-08-16 2013-05-14 The Regents Of The University Of Michigan Apparatus and method for deposition for organic thin films
CN104550897A (zh) * 2014-12-15 2015-04-29 余姚市庆达机械有限公司 一种塞杆机构
CN108145112B (zh) * 2016-12-05 2020-01-21 上海梅山钢铁股份有限公司 基于液位自动控制的板坯连铸塞棒控流自动开浇工艺
JP2022538688A (ja) 2019-07-05 2022-09-05 イオックス セラピューティクス アーゲー ＩＧＳＦ１１（ＶＳＩＧ３）のＩｇＣ２に結合する抗体及びその使用
EP4175668A1 (de) 2020-07-06 2023-05-10 iOmx Therapeutics AG Igv von igsf11 (vsig3) bindende antikörper und verwendungen davon

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Publication number Priority date Publication date Assignee Title
JPS5668570A (en) * 1979-11-07 1981-06-09 Kobe Steel Ltd Method of controlling molten metal surface when starting up continuous casting
DE3421344C2 (de) * 1984-06-08 1993-04-29 Krupp Stahl Ag, 4630 Bochum Verfahren und Vorrichtung zum automatischen Füllen einer Stranggießkokille beim Angießen eines Stranges
DE3509932A1 (de) * 1985-03-19 1986-10-02 Metacon AG, Zürich Verfahren zum anfahren einer stranggiessanlage
LU85878A1 (de) * 1985-05-07 1986-12-05 Arbed Verfahren zur automatischen steuerung des anfahrbetriebes einer metall-stanggiessanlage
EP0214797B1 (de) * 1985-09-02 1991-06-26 Nippon Steel Corporation Verfahren zum Regeln des Anfangsstadiums beim Stranggiessen
MX170682B (es) * 1988-11-22 1993-09-07 Hitachi Zosen Corpuration Metodo para el arranque automatico de un aparato de fundicion continua
CH682376A5 (de) * 1990-02-28 1993-09-15 Stopinc Ag Verfahren zum automatischen Angiessen von einer Stranggiessanlage.
FR2677284B1 (fr) * 1991-06-07 1993-08-27 Pechiney Aluminium Procede et appareillage pour la coulee automatique de demi-produits.
CA2094029C (en) * 1991-09-12 1997-04-29 Kazuya Asano Molten metal level control method and device for continuous casting
FR2698806B1 (fr) * 1992-12-07 1995-01-06 Lorraine Laminage Procédé de remplissage automatique d'une lingotière de coulée continue, en début de coulée, et dispositif pour sa mise en Óoeuvre.
EP0776715B1 (de) * 1995-02-28 2003-08-13 Nkk Corporation Verfahren und vorrichtung zum kontrollierten stranggiessen
US5913357A (en) * 1995-10-18 1999-06-22 Sumitomo Metal Industries, Ltd. Method for controlling the level of molten metal for a continuous casting machine

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CZ200041A3 (cs) 2000-12-13
RU2216430C2 (ru) 2003-11-20
JP4224840B2 (ja) 2009-02-18
US6374902B1 (en) 2002-04-23
SK285291B6 (sk) 2006-10-05
CA2296743A1 (fr) 1999-01-28
PL338193A1 (en) 2000-10-09
WO1999003619A1 (fr) 1999-01-28
SK322000A3 (en) 2000-09-12
PT998360E (pt) 2003-01-31
DE69808299D1 (de) 2002-10-31
CN1086614C (zh) 2002-06-26
FR2766113A1 (fr) 1999-01-22
CZ288868B6 (cs) 2001-09-12
BR9811792A (pt) 2000-09-26
TW375540B (en) 1999-12-01
MXPA00000553A (es) 2002-04-24
AU8444898A (en) 1999-02-10
FR2766113B1 (fr) 1999-09-17
EP0998360A1 (de) 2000-05-10
DK0998360T3 (da) 2003-01-13
KR20010021889A (ko) 2001-03-15
JP2001510094A (ja) 2001-07-31
KR100538966B1 (ko) 2005-12-26
UA59406C2 (uk) 2003-09-15
CN1264328A (zh) 2000-08-23
PL186661B1 (pl) 2004-02-27
TR200000104T2 (tr) 2001-07-23
DE69808299T2 (de) 2003-05-28
ES2184303T3 (es) 2003-04-01
ATE224783T1 (de) 2002-10-15
ZA986185B (en) 1999-01-28
RO120463B1 (ro) 2006-02-28
AU727961B2 (en) 2001-01-04
CA2296743C (fr) 2008-02-12

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