EP3744440A1 - Procédé et dispositif de coulée continue - Google Patents

Procédé et dispositif de coulée continue Download PDF

Info

Publication number
EP3744440A1
EP3744440A1 EP20173661.8A EP20173661A EP3744440A1 EP 3744440 A1 EP3744440 A1 EP 3744440A1 EP 20173661 A EP20173661 A EP 20173661A EP 3744440 A1 EP3744440 A1 EP 3744440A1
Authority
EP
European Patent Office
Prior art keywords
cast strand
temperature
surface section
continuous casting
secondary cooling
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.)
Withdrawn
Application number
EP20173661.8A
Other languages
German (de)
English (en)
Inventor
Axel Weyer
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.)
SMS Group GmbH
Original Assignee
SMS Group GmbH
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 SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP3744440A1 publication Critical patent/EP3744440A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
    • 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
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling

Definitions

  • the present invention relates to a method and an apparatus for continuous casting.
  • a device for continuous casting typically comprises a mold and a strand guide with a plurality of strand guide rollers, which is arranged downstream of the mold in the casting direction.
  • liquid metal in particular liquid steel
  • a device for primary cooling so that a cast strand with an initially still liquid core but already solidified, load-bearing strand shell is formed inside the mold.
  • the cast strand After the cast strand has left the mold with a stable shell, it is guided within the downstream strand guide and cooled by means of a device for secondary cooling until it is finally completely solidified.
  • the solidification length indicates the length of the metal strand from the exit from the mold to the location of the device for continuous casting at which the cast strand has completely solidified.
  • the guide within the strand guide takes place between opposite strand guide rollers, the cast strand typically being bent over from the vertical to the horizontal.
  • the solidified, continuous cast strand is regularly divided into individual slabs, thin slabs, billets or blooms at the outlet of the device for continuous casting.
  • the JP 2014 037001 A proposed to determine the degree of solidification of a cast strand using a heat transfer model taking into account the cooling conditions of the secondary cooling.
  • the temperature distribution in the width direction of the cast strand is measured with a thermometer.
  • a surface of the cast strand is recorded with a camera and the temperature distribution is determined based on the brightness distribution of the recorded image.
  • WO 2017/144481 A1 discloses an array of nozzles for applying coolant to the cast strand. This is intended for installation in roller gaps between two strand guide rollers.
  • the known nozzle row arrangement has nozzles with different control ratios. The control ratio indicates how far the volume flow of the coolant discharged by means of the nozzle can be reduced compared to the nozzle-specific maximum value without there being a significant change in the jet cone.
  • the present invention is consequently based on the object of specifying a method and a device for continuous casting with which the process reliability can be increased and a qualitatively improved semi-finished product can be obtained.
  • a method for continuous casting in which a cast strand is cast.
  • the cast strand has at least a first and a second surface section.
  • At least one thermal image of the cast strand is recorded after secondary cooling of the cast strand by means of a device for secondary cooling.
  • the method is characterized in that the at least first and second surface section is recorded with the thermal image (s).
  • a first actual temperature of the first surface section of the cast strand is recorded by means of the thermal image or images.
  • a second actual temperature of the second surface section of the cast strand is also recorded by means of the thermal image or images.
  • a cooling nozzle field of the device for secondary cooling that is assigned to the first surface section is regulated.
  • a cooling nozzle field of the device for secondary cooling that is assigned to the second surface section is regulated.
  • the determination of the respective actual temperature of several surface sections of the cast strand by means of one or more thermal images after the secondary cooling, in particular at the outlet of the continuous caster, and the targeted influencing of the temperature of these surface sections by the respectively assigned cooling nozzle fields allow a targeted setting of the temperature profile of the cast strand for the subsequent one Machining.
  • a homogeneous temperature profile of the cast strand can have a very positive effect on the material properties of the further processed semi-finished product.
  • the temperature of individual surface points is determined, but also entire, more or less large surface sections.
  • the measuring thermal imager can, for example, have a resolution between 600 x 400 pixels or heat dots and 1650 x 1250 pixels or heat dots, in particular 640 x 480 pixels or heat dots, with which one between half a square meter and one and a half square meters, in particular a one square meter Surface portion of the cast strand can be detected. On the one hand, this allows the effort involved in evaluating the measurement to be kept low.
  • the surface sections evaluated by means of the thermal images can have a circular geometry in order to further simplify the evaluation.
  • the geometry of the surface sections is freely specified by the user.
  • the use of a thermal imaging camera enables the temperature to be measured synchronously at different points on the measured object. In particular with the moving cast strand, a simultaneous measurement of the temperature of different Surface sections of the cast strand guaranteed perpendicular to the conveying direction and the control of the temperature distribution simplified. In contrast to previous temperature measurement methods, the thermal imaging camera can also be suitable for measuring the surface temperature in the presence of fog, water vapor or smoke in the vicinity of the cast strand.
  • the cooling nozzle fields can be, for example, sections of one or more of the in the WO 2017/144481 A1 Acting nozzle row arrangements described.
  • the water pressure or the volume of water dispensed and, if applicable, the air pressure or the amount of air dispensed by the single-substance nozzles (pure water cooling) or two-substance nozzles (water-air Cooling) can be controlled.
  • first and second surface sections are adjacent and the amount of the difference between the first target temperature and the second target temperature is less than 150 Kelvin (
  • a good quality of the semi-finished products produced can be obtained in particular with an amount of the difference between the first target temperature and the second target temperature of less than 100 Kelvin (
  • a choice of the first and / or second target temperature of more than 800 ° C. can simplify the further processing of the cast strand.
  • less energy is required for further processing (for example in a rolling mill) the semi-finished products (for example slabs), since the semi-finished products have to be heated to a lesser extent.
  • the first and / or second target temperature is preferably greater than 900 ° C.
  • a core temperature of the cast strand is determined by means of the first actual temperature and the second actual temperature.
  • the core temperature can provide an indication of the position of the sump tip in the cross-section of the cast strand. This can enable verification of simulation calculations or other metrological methods by converting the measured temperatures.
  • an average temperature of the first surface section can be determined as the first actual temperature.
  • the use of average temperatures can reduce the risk of the temperature control being influenced by individual extreme values, which e.g. Measurement errors.
  • actual temperatures in the form of average, maximum or minimum temperatures can also be determined from the further surface sections.
  • the upper side of the cast strand and / or the underside of the cast strand and / or the left side of the cast strand and / or the right side of the cast strand and / or the end face of the cast strand can be detected by means of the thermal image (s).
  • a thermal image that records the end face of the cast strand can enable the core temperature of the cast strand to be determined more precisely.
  • the core temperature measured on the front side which is the highest temperature that can usually be found in the center of the cross-section, can be an indication of a possible increase in the casting speed. If, for example, a defined maximum limit temperature in the cross-sectional core at the end face of the cast strand, ie the separation point of the separated semi-finished product, of 1200 ° C., for example, is not reached, Casting speed can still be increased safely until this limit is reached. The risk of breaking out (breakthrough of liquid steel on the face, broad side or narrow side) can be reduced in this way while increasing production at the same time.
  • one embodiment of the method provides that the casting speed is regulated as a function of the first and / or second actual temperature.
  • the secondary cooling can initially be increased, whereby the cross-sectional temperature is reduced in order to subsequently increase the casting speed.
  • the productivity of the apparatus for continuous casting can thus be improved.
  • a pictorial representation of the temperature profile of the cast strand obtained by means of the method described above can simplify operation, quality assurance and maintenance for the user of the device for continuous casting.
  • a device for continuous casting with a device for secondary cooling of a cast strand and with at least one thermal imaging camera for recording at least one thermal image of the cast strand after the device for secondary cooling of the cast strand is proposed, the device for secondary cooling having a first cooling nozzle field which is a first surface section of the cast strand is assigned, and wherein the device for secondary cooling has a second cooling nozzle field which is assigned to a second surface section of the cast strand.
  • the device is characterized in that it is set up to record the at least first and second surface section with the thermal image (s), to determine a first actual temperature of the first surface section of the cast strand by means of the thermal image or images, by means of the or the thermal images to determine a second actual temperature of the second surface section of the cast strand, depending on a first difference between the first actual temperature and a first target temperature to regulate a cooling nozzle field of the device for secondary cooling assigned to the first surface section, and depending on the second difference between the second actual temperature and a second target temperature, on the second To regulate surface section associated cooling nozzle field of the device for secondary cooling.
  • the device shown for continuous casting comprises a pan P, in which liquid metal, in particular steel, can be transported to an intermediate container Z and poured into it.
  • the liquid metal flows from the intermediate container Z to a mold KO, at the edges of which the liquid metal is cooled with a primary cooling device (not shown), so that there is a cast strand G with an initially still liquid core, but already solidified, inside the mold KO. more stable strand shell.
  • the cast strand G After the cast strand G has left the mold KO, it is guided by means of a strand guide in such a way that, starting from the cast, it is bent in the direction of gravity and in a horizontal conveying direction F. is transported further.
  • the strand guide has a plurality of strand guide rollers R lying opposite one another.
  • Nozzle row arrangements SK1, SK2, SK3 for secondary cooling are provided between the opposite strand guide rollers R.
  • the cast strand G is cooled by means of the device for secondary cooling formed by the row arrangements SK1, SK2, SK3 until it has solidified.
  • the cast strand G is then divided into semi-finished products B using a device not shown in the figure.
  • the semi-finished product B is a slab B.
  • At least one thermal imaging camera K is provided in the outlet of the device for continuous casting.
  • the device for secondary cooling comprises cooling nozzle fields SK1, SK2, SK3, SK4 of which four cooling nozzle fields are assigned to four surface sections W1, W2, W3, W4 of the cast strand G.
  • the three surface sections W1, W2, W3 are surface sections of the upper side of the cast strand G, ie a broad side of the strand, and a surface section W4 is a surface section of a narrow side.
  • a thermal imaging camera K is used to record at least one thermal image of the cast strand G after the device for secondary cooling. Actual temperatures of surface sections W1, W2, W3, W4 are determined by means of the thermal image. The actual temperatures are average temperatures of the surface sections W1, W2, W3, W4.
  • step 301 the parameters of the semifinished product B to be produced, in particular its dimensions and its material properties, are recorded (step 301).
  • control specifications for the device for continuous casting are determined in an automated manner (step 302).
  • the target surface temperatures of the cast strand G at the outlet of the device for continuous casting and the target cross-sectional temperatures of the cast strand at the outlet of the device for continuous casting are determined.
  • the corresponding temperatures at the outlet of the continuous caster are then regulated.
  • default values for the device for secondary cooling are first determined on the basis of the target surface temperatures and the target cross-sectional temperatures, and the cast strand is cooled based on these values (step 303).
  • the actual surface temperatures and the actual cross-sectional temperatures are then measured and compared with the previously determined setpoint surface temperatures and setpoint cross-sectional temperatures (step 304).
  • the default values for the device for secondary cooling are then adapted (step 303).
  • the measured actual temperatures can then be made available to connection processes (e.g. rolling processes) and / or stored for purposes of quality assurance (step 305).
  • connection processes e.g. rolling processes
  • quality assurance e.g. quality assurance
EP20173661.8A 2019-05-28 2020-05-08 Procédé et dispositif de coulée continue Withdrawn EP3744440A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019207789.7A DE102019207789A1 (de) 2019-05-28 2019-05-28 Verfahren und Vorrichtung zum Stranggießen

Publications (1)

Publication Number Publication Date
EP3744440A1 true EP3744440A1 (fr) 2020-12-02

Family

ID=70680245

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20173661.8A Withdrawn EP3744440A1 (fr) 2019-05-28 2020-05-08 Procédé et dispositif de coulée continue

Country Status (2)

Country Link
EP (1) EP3744440A1 (fr)
DE (1) DE102019207789A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011077454A1 (de) 2011-06-14 2012-12-20 Sms Siemag Ag Stranggießanlage
JP2014037001A (ja) 2012-08-20 2014-02-27 Jfe Steel Corp 連続鋳造の最終凝固予測方法、鋳片の凝固状態推定方法及び連続鋳造方法
KR20150073017A (ko) * 2013-12-20 2015-06-30 주식회사 포스코 온도측정장치
EP2753439B1 (fr) 2011-09-06 2015-08-12 SMS group GmbH Procédé de coulée, en particulier procédé de coulée continue
WO2017144481A1 (fr) 2016-02-24 2017-08-31 Sms Group Gmbh Ensemble de rangées de buses et champ de buses destinés à être montés dans des fentes situées entre deux rouleaux de corset de guidage
DE102017213854A1 (de) * 2017-08-09 2019-02-14 Sms Group Gmbh Anlage und Verfahren zur Herstellung eines metallischen Produkts

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011077454A1 (de) 2011-06-14 2012-12-20 Sms Siemag Ag Stranggießanlage
EP2753439B1 (fr) 2011-09-06 2015-08-12 SMS group GmbH Procédé de coulée, en particulier procédé de coulée continue
JP2014037001A (ja) 2012-08-20 2014-02-27 Jfe Steel Corp 連続鋳造の最終凝固予測方法、鋳片の凝固状態推定方法及び連続鋳造方法
KR20150073017A (ko) * 2013-12-20 2015-06-30 주식회사 포스코 온도측정장치
WO2017144481A1 (fr) 2016-02-24 2017-08-31 Sms Group Gmbh Ensemble de rangées de buses et champ de buses destinés à être montés dans des fentes situées entre deux rouleaux de corset de guidage
DE102017213854A1 (de) * 2017-08-09 2019-02-14 Sms Group Gmbh Anlage und Verfahren zur Herstellung eines metallischen Produkts

Also Published As

Publication number Publication date
DE102019207789A1 (de) 2020-12-03

Similar Documents

Publication Publication Date Title
EP1799368B1 (fr) Procede et dispositif de production continue d'une fine bande metallique
EP3184202B1 (fr) Procédé de coulée continue d'une barre métallique
DE3423475A1 (de) Verfahren und einrichtung zum stranggiessen von fluessigen metallen, insbesondere von fluessigem stahl
EP1200216B1 (fr) Procede et dispositif de fabrication d'un brin metallique
DE4417808C2 (de) Verfahren zum Stranggießen eines Metallstranges
EP2349612A1 (fr) Procédé et installation de coulée continue pour la production de brames épaisses
EP0834364A2 (fr) Méthode et dispositif pour des machines de coulée continue à haute vitesse avec réduction d'épaisseur pendant la solidification
DE4403049C1 (de) Stranggießanlage und Verfahren zur Erzeugung von Dünnbrammen
DE2814600A1 (de) Verfahren und vorrichtung zum stahlstranggiessen
EP0732979B1 (fr) Installation de coulee continue et de laminage pour bandes d'acier et systeme de reglage connexe
EP1601479A1 (fr) Installation de coulee continue et de laminage pour produire un feuillard d'acier
EP0881018A2 (fr) Procédé et dispositif pour mesurer et ajuster la température et la quantité d'eau de refroidissement pour parois de lingotières de coulée continue refroidies par eau
WO2004048016A2 (fr) Procede et dispositif pour la coulee continue de barres de brames, de brames fines, de blooms, d'ebauches, de billettes et similaires a partir de metal liquide, notamment de materiaux d'acier
DE19810672A1 (de) Verfahren und Vorrichtung zur Kontrolle des Wärmestromes einer Kokille beim Stranggießen von Brammen
DE102020209794A1 (de) Verfahren zur Steuerung oder Regelung der Temperatur eines Gießstrangs in einer Stranggießanlage
EP3744440A1 (fr) Procédé et dispositif de coulée continue
EP3441157B1 (fr) Procédé et dispositif pour la coulée continue d'un produit métallique
EP3733323A1 (fr) Procédé et installation de coulée en continu d'une barre de coulée
EP2025432B1 (fr) Procédé destiné à la production de produits allongés en acier par coulage en continu et laminage
DE2903608A1 (de) Verfahren und vorrichtung zur beeinflussung der form eines strangquerschnittes in einer stranggiessanlage
EP1827735B1 (fr) Procede et dispositif de coulee en bande de metaux
EP1013362B1 (fr) Procédé et installation de coulée en continu de brames
DE19916190C2 (de) Verfahren und Vorrichtung zum Stranggießen von Brammen
AT403351B (de) Verfahren zum stranggiessen eines metallstranges
EP3519124B1 (fr) Procédé de multi-moulage de barres métalliques

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20200508

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20201211