EP3628416A1 - Procédé et installation de coulée continue d'un produit métallique - Google Patents

Procédé et installation de coulée continue d'un produit métallique Download PDF

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Publication number
EP3628416A1
EP3628416A1 EP19197237.1A EP19197237A EP3628416A1 EP 3628416 A1 EP3628416 A1 EP 3628416A1 EP 19197237 A EP19197237 A EP 19197237A EP 3628416 A1 EP3628416 A1 EP 3628416A1
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EP
European Patent Office
Prior art keywords
strand
thickness
comparison value
supporting
guide
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.)
Granted
Application number
EP19197237.1A
Other languages
German (de)
English (en)
Other versions
EP3628416B1 (fr
Inventor
Thomas Heimann
Uwe Plociennik
Jürgen Müller
André Stuhlsatz
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
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SMS Group GmbH
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Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP3628416A1 publication Critical patent/EP3628416A1/fr
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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
    • B22D11/16—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
    • B22D11/14—Plants for continuous casting
    • B22D11/142—Plants for continuous casting for curved casting
    • 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
    • B22D11/14—Plants for continuous casting
    • B22D11/144—Plants for continuous casting with a rotating mould
    • 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
    • B22D11/188—Controlling or regulating processes or operations for pouring responsive to thickness of solidified shell

Definitions

  • the invention relates to a method for the continuous casting of a metallic product according to the preamble of claim 1, and a continuous caster according to the preamble of claim 10.
  • the liquid metal is continuously poured into a mold, a first strand shell being formed there.
  • the strand emerges downward from the mold, the strand then being transported along a supporting strand guide.
  • the strand is then moved along another strand guide with a straightening area through which the strand is deflected in the horizontal direction.
  • further processing stations for the strand, or partial products formed therefrom can be provided along the strand guide, for example in the form of rolling mills through which the strand is passed.
  • the cooling capacity in the area of the supporting strand guide and the casting speed are set such that the bottom tip of the strand is always in front of or upstream of the last pair of support rollers at the end of the supporting strand guide in an optimal operating sequence.
  • DE 1 558 345 A is known to sense or scan bumps in unsupported areas of metal strands in the continuous casting process, namely by using mechanical sensors with rotatable and heat-resistant wheels that roll on the broad sides of the moving strand. Because these mechanical sensors can be moved back and forth in a direction perpendicular to the direction of conveyance of the strand, dents can be sensed which form on at least one broad side of the strand when the strand is bulged. In this case it can be provided to change the casting speed or to adjust the amount of water that is sprayed onto the moving strand in the region of the supporting strand guide.
  • the measuring principle according to DE 1 558 345 A with which bulges or an increase in thickness is mechanically determined with a contacting measuring roller on the surface of a moving strand after it emerges from a supporting strand guide, is subject to various disadvantages, e.g. wear of the wheels of the mechanical sensors due to the high temperatures of the strand . Furthermore, measurement errors can result if these wheels do not roll cleanly on the broad sides of the strand.
  • the invention has for its object to optimize the continuous casting of a metallic product in terms of quality improvement and at the same time to increase operational reliability.
  • a method according to the present invention is used to manufacture a metallic product.
  • a strand of the metallic product continuously emerges from a mold, in particular vertically downward, and is then transported along a supporting strand guide in a conveying direction, the strand being deflected in a directional area in the horizontal direction.
  • a thickness of the strand is measured by a radar measuring device at a measuring position where the strand immediately leaves the supporting strand guide, and then in step (ii) the measured strand thickness is compared with a first predetermined comparison value .
  • a step (iii) if the measured strand thickness is greater than the first predetermined comparison value, at least one casting parameter is changed such that the bottom tip of the strand moves in the direction of the mold.
  • the invention provides a continuous caster for producing a metallic product.
  • a system comprises a mold and a supporting strand guide adjoining the mold, along which a strand emerging from the mold in particular vertically downwards can be transported in a conveying direction.
  • another strand guide is provided with a straightening area through which the strand can be deflected in the horizontal direction.
  • a radar measuring device with which a thickness of the strand can be measured at a measuring position located directly at the end of the supporting strand guide
  • a control device which is connected to the radar measuring device for signaling purposes, are provided with a computing unit with which the measured strand thickness can be measured with a first predetermined comparison value can be compared.
  • control device is set up in such a way that if the measured strand thickness is greater than the first predetermined comparison value, a control signal can then be used to change at least one casting parameter in such a way that the bottom tip of the strand moves in the direction of the mold.
  • the invention is based on the essential finding that the measurement of a thickness of the strand at a measuring position where the strand immediately leaves the supporting strand guide is carried out using radar technology.
  • a radar measuring device is arranged directly at the end of the supporting strand guide, namely where the strand exits the supporting strand guide.
  • radar measurement technology has the advantages that temperature radiation in the near IR range, which emanates from the hot line, does not influence the radar measurement, and that water vapor that arises from the Strand cooling using water occurs without the measurement being distorted from the radar beams to the strand.
  • a radar measurement is insensitive to soiling compared to an optical measurement using a laser and a mechanical measurement using a touching measuring roller.
  • the radar measuring device With regard to the positioning of the radar measuring device in the continuous casting installation, it is recommended that a relatively large distance from the hot strand be maintained. This is possible thanks to the contactless radar measurement. Such a sufficiently large distance between the radar measuring device and the hot strand ensures good protection of the radar electronics against the radiation heat emanating from the strand.
  • the radar measuring device is arranged relative to the supporting strand guide and the strand emerging therefrom in such a way that the radar beams or waves are directed essentially perpendicularly to a surface of the strand, namely on its broad side (s). In this way, the radar beams are directed or transmitted perpendicularly to the surface of at least one broad side of the strand by the radar measuring device.
  • the radar beams are directed vertically from both sides of the strand onto its broad sides. This ensures a uniform and complete measurement of the thickness of the strand immediately after it has left the supporting strand guide, in conjunction with a detection of possible "bumps" on the surfaces of the broad sides.
  • Such monitoring of the string from both sides can be achieved in that the radar measuring device has separate transmitting / receiving modules which are arranged on both sides of the broad sides of the string and emit their radar beams or waves essentially perpendicularly to the broad sides of the string .
  • the radar measuring device can also have separate parabolic elements which are arranged on both sides of the broad sides of the strand and which align the radar beams essentially perpendicularly to the broad sides of the strand.
  • the actual radar measuring device with its sensitive transmitter / receiver unit, can be positioned at a sufficient distance from the hot strand and related components of the continuous casting installation.
  • a further improved protection of the radar measuring device against the high temperatures of the string can be achieved by thermal insulation layers in which the radar measuring device is encapsulated. This is possible because radar beams penetrate such dielectric materials in the form of thermal insulation layers.
  • An important feature of the method according to the invention, and in the same way of a control device of the continuous casting installation according to the invention, is that in the event that the strand thickness measured by the radar measuring device is greater than the first predetermined comparison value, then at least one casting parameter in is changed in such a way that the sump tip of the strand moves in the direction of the mold.
  • the bottom of the sump - as seen in the direction of conveyance of the strand - is shifted upstream and thereby "migrates" back into the supporting strand guide.
  • the said change of at least one casting parameter expediently consists in that the casting speed is reduced, but is not set lower than a minimum casting speed at which the bottom tip of the strand is below LiquidCoreReduction (LCR) segments of the supported strand guide.
  • LCR LiquidCoreReduction
  • the first predetermined comparison value with which the strand thickness measured by the radar measuring device is compared in step (ii) is a distance between the last two support rollers at the end of the supporting strand guide, i.e. at their exit area, where the moving strand leaves the supporting strand guide.
  • this spacing of the two last support rollers from one another their deflection is also taken into account, which can occur when the strand is passed between these opposite support rollers.
  • the casting speed can then be reduced will.
  • a reduction in the casting speed has an immediate effect on the entire length of the strand, and thus also on the position of the bottom tip of the strand, which is hereby shifted upstream, ie counter to the conveying direction of the strand, in the direction of the mold.
  • the thickness of the strand after it has left the supporting strand guide is measured exactly by means of a radar measurement.
  • possible bulges of the strand when it emerges from the supporting strand guide can be recognized precisely and reliably, in connection with the initiation of an immediate "countermeasure", preferably in the form of a reduction in the casting speed.
  • the continuous casting installation 10 comprises a mold 12, which is followed by a supporting strand guide 13 with a total of four segments 13.1-13.4.
  • Fig. 4 liquid metal is poured into the mold 12 in the area of a melt inlet 6, in which case a strand S with an initially still liquid core 7 enters the supporting strand guide 13 from the mold 12 downwards.
  • a strand S with an initially still liquid core 7 enters the supporting strand guide 13 from the mold 12 downwards.
  • These support roller pairs 14, 14 ' are each acted upon by position-controlled or position-controlled hydraulic cylinders, not shown, so that they overcome the hydrostatic pressures of the melt 8 and can thereby cause a local reduction in thickness in the strand.
  • This applies in particular to the first two segments 13.1, 13.2 of the supporting strand guide 13, where the strand S with its liquid core 7 can be reduced in thickness by compressing the segments, which is also referred to as LiquidCoreReduction ( LCR).
  • FIG. 1 Another strand guide 19 with a straightening area I, in which the strand S is deflected by bending rollers 22 in the horizontal direction. Following the straightening area I, a pair of scissors 23 is arranged in the strand guide 19, followed by at least one rolling mill 24 and a furnace 26 arranged in front of it.
  • the continuous caster 10 comprises a radar measuring device 16, with which a thickness of the strand S is measured at a measuring position 18, namely directly where the strand from the supporting strand guide 13 after passing through the last pair of support rollers 14L, 14L ' exit.
  • This measurement position 18 is indicated by an arrow in the Fig. 1 illustrated.
  • the radar measuring device 16 has separate transmitting / receiving modules 16.1, 16.2, which are each arranged on both sides of the broad sides of the strand S and with which radar beams are then directed perpendicularly to the surface of a broad side of the strand.
  • the distance between these transmitting / receiving modules 16.1, 16.2 from the supporting strand guide 13 and the hot strand S guided therein is sufficiently large that these modules are not damaged by the thermal radiation emanating from the strand S.
  • each parabolic element 17.1, 17.2 is provided, which are arranged on both sides of the broad sides B1, B2 of the strand S, in order thereby to direct the radar beams essentially perpendicularly to the broad sides B1, B2. This makes it possible to arrange the actual radar measuring device 16 in the radiation shadow, thereby ensuring a further improved protection against the heat radiation of the strand S.
  • the continuous casting installation 10 comprises a control device 20 with a computing unit 21, which is connected to the radar measuring device 16, the bending rollers 22 in the area of the strand guide 19 and the at least one rolling mill 24 in terms of signals Fig. 1 each symbolized by dotted lines.
  • This ensures that on the one hand the strand thickness measured by the radar measuring device 16 is transmitted to the computing unit 21, and that the computing unit 21 on the other hand also information relating both to a distance between the bending rollers 22 and to the distance from (not shown) Work rolls of the rolling mill 24 receives.
  • control device 20 both to the mold 20 and to the scissors 23, symbolizing that suitable control signals can be generated by the control device 20 in order to change both a casting speed in the mold 12 and the scissors 23 - if required - to operate, as explained separately below.
  • a minimum casting speed V min is determined on the basis of the current process values (chemical analysis of the material, strand thickness, cooling capacity set for the segments 13.1-13.4 of the supporting strand guide 13), at which the bottom tip SP below the two LCR segments 13.1, 13.2 lies (see illustration in Fig. 4 ).
  • the radar measuring device 16 continuously measures a thickness of the strand S, as explained above at the measuring position 18, ie immediately where the strand S emerges from the end 15 of the supporting strand guide 13. This corresponds to a step (i) of a method according to the present invention, the measured strand thickness being transmitted to the computing unit 21 of the control device 20.
  • the measured strand thickness is compared with a first Predetermined comparison value compared, which corresponds to a distance between the two last support rollers 14L, 14L 'to each other.
  • the control device 20 immediately generates a control signal with which, for example, the casting speed is set to a reduced value V red .
  • a query is carried out in the computing unit 21 for the further course of the continuous casting process as to whether the strand thickness measured by the radar measuring device 16 in step (i) is less than a predetermined second comparison value , which corresponds to a distance from bending rollers 22 arranged opposite one another. If a "No" is determined with this query, which means that the strand thickening of the strand S can no longer be transported through the bending rollers 22, the control device 20 outputs a control signal for an immediate stop of casting in order to further damage the strand guide 19 to avoid the continuous caster 12.
  • a further query is made in the computing unit 21 as to whether the strand thickness measured by the radar measuring device 16 in step (i) is smaller than a predetermined third comparison value, which corresponds to a distance from opposing work rolls in the rolling mill 24. If a "No" is determined in this query, this means that the existing strand thickening in the rolling mill 24 cannot be brought to a desired final dimension. Therefore, the control device 20 then generates a control signal for the scissors 23, by means of which the thickened section of the strand S is separated from the strand guide 19 and shredded accordingly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP19197237.1A 2018-09-27 2019-09-13 Procédé et installation de coulée continue d'un produit métallique Active EP3628416B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018216529.7A DE102018216529A1 (de) 2018-09-27 2018-09-27 Verfahren und Anlage zum Stranggießen eines metallischen Produkts

Publications (2)

Publication Number Publication Date
EP3628416A1 true EP3628416A1 (fr) 2020-04-01
EP3628416B1 EP3628416B1 (fr) 2021-06-30

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ID=67956535

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EP19197237.1A Active EP3628416B1 (fr) 2018-09-27 2019-09-13 Procédé et installation de coulée continue d'un produit métallique

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EP (1) EP3628416B1 (fr)
DE (1) DE102018216529A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3922378A1 (fr) * 2020-06-11 2021-12-15 Mecorad GmbH Procédé et appareil pour la détermination sans contact d'au moins une propriété d'un brin continu au moins partiellement fondu

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1173755A (en) * 1965-12-30 1969-12-10 Concast Ag A Method and Apparatus for Controlling a Continuous Casting Plant
DE1558345A1 (de) 1966-03-25 1970-03-19 United States Steel Corp Verfahren und Vorrichtung zum Abfuehlen und Messen von Beulen an Gussstrangen
JPH0255652A (ja) * 1988-08-22 1990-02-26 Nippon Steel Corp 鋳片のクレータエンド位置の制御方法
DE19931331A1 (de) * 1999-07-07 2001-01-18 Siemens Ag Verfahren und Einrichtung zum Herstellen eines Stranges aus Metall
EP2237908A1 (fr) * 2008-01-18 2010-10-13 Corus Staal BV Procédé et appareil de contrôle des surfaces de scorie et de métal en fusion dans un moule
EP2422900A1 (fr) * 2010-08-26 2012-02-29 SMS Concast AG Agencement pour mesurer les paramètres physiques dans des lingotières de coulée en continu

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19511113A1 (de) 1995-03-25 1996-09-26 Schloemann Siemag Ag Strangführung einer Stranggießanlage für Dünnbrammen
DE102007022932A1 (de) 2006-05-26 2007-12-20 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes durch Stranggießen
RU2431116C2 (ru) 2007-03-09 2011-10-10 Смс Зимаг Аг Устройство и способ измерения толщины
US20090084517A1 (en) 2007-05-07 2009-04-02 Thomas Brian G Cooling control system for continuous casting of metal
WO2017201059A1 (fr) 2016-05-16 2017-11-23 Golden Aluminum Company Système et procédé d'ajustement des composants de coulée continue

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1173755A (en) * 1965-12-30 1969-12-10 Concast Ag A Method and Apparatus for Controlling a Continuous Casting Plant
DE1558345A1 (de) 1966-03-25 1970-03-19 United States Steel Corp Verfahren und Vorrichtung zum Abfuehlen und Messen von Beulen an Gussstrangen
JPH0255652A (ja) * 1988-08-22 1990-02-26 Nippon Steel Corp 鋳片のクレータエンド位置の制御方法
DE19931331A1 (de) * 1999-07-07 2001-01-18 Siemens Ag Verfahren und Einrichtung zum Herstellen eines Stranges aus Metall
EP2237908A1 (fr) * 2008-01-18 2010-10-13 Corus Staal BV Procédé et appareil de contrôle des surfaces de scorie et de métal en fusion dans un moule
EP2422900A1 (fr) * 2010-08-26 2012-02-29 SMS Concast AG Agencement pour mesurer les paramètres physiques dans des lingotières de coulée en continu

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3922378A1 (fr) * 2020-06-11 2021-12-15 Mecorad GmbH Procédé et appareil pour la détermination sans contact d'au moins une propriété d'un brin continu au moins partiellement fondu
WO2021250271A1 (fr) 2020-06-11 2021-12-16 Mecorad Gmbh Procédé et dispositif de détermination sans contact d'au moins une propriété d'un produit long de coulée continue au moins partiellement fondu

Also Published As

Publication number Publication date
EP3628416B1 (fr) 2021-06-30
DE102018216529A1 (de) 2020-04-02

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