EP0719607A1 - Verfahren zur Regelung des kontinuierlichen Giessens zwischen Walzen - Google Patents

Verfahren zur Regelung des kontinuierlichen Giessens zwischen Walzen Download PDF

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Publication number
EP0719607A1
EP0719607A1 EP95402810A EP95402810A EP0719607A1 EP 0719607 A1 EP0719607 A1 EP 0719607A1 EP 95402810 A EP95402810 A EP 95402810A EP 95402810 A EP95402810 A EP 95402810A EP 0719607 A1 EP0719607 A1 EP 0719607A1
Authority
EP
European Patent Office
Prior art keywords
force
rsf
value
measured
cylinders
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
EP95402810A
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English (en)
French (fr)
Other versions
EP0719607B1 (de
Inventor
Gilles Fellus
Olivier Salvado
Yves Leclercq
François Mazodier
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 Sacilor 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 Sacilor SA filed Critical Thyssen Stahl AG
Publication of EP0719607A1 publication Critical patent/EP0719607A1/de
Application granted granted Critical
Publication of EP0719607B1 publication Critical patent/EP0719607B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

Definitions

  • the present invention relates to continuous casting between cylinders of thin metallic products, in particular steel.
  • the manufactured product for example a thin strip of steel a few millimeters thick
  • the manufactured product is obtained by pouring the molten metal into a casting space defined between two cylinders with parallel axes, cooled and driven in rotation in the opposite direction.
  • the metal solidifies and the solidified metal skins, driven by the rotation of the cylinders, meet at the neck between the cylinders, to form the said strip, extracted downwards.
  • the cast strip must in particular have a section corresponding, in shape and dimensions, to the desired section.
  • the air gap at the neck between the cylinders is substantially equal to the desired thickness of the strip.
  • the accuracy of the thickness is less important than its regularity over the entire length of the strip.
  • the main constraint is of course to obtain a continuous strip, and it is therefore necessary to ensure the extraction of the strip, and that this strip is sufficiently solidified during of its extraction.
  • Over-solidification of the metal upstream of the neck is not necessarily detrimental in the case of the casting of relatively malleable metals, for example aluminum, but it is unacceptable for harder metals, such as steel, because then such over-solidification leads either to the formation of a metal wedge above the neck, preventing extraction, or to a deterioration of the cylinders during the passage between them of excessively solidified metal.
  • EP-A-123 059 and EP-A-0194 628 disclose a casting method according to which, to avoid deterioration of the casting rolls in the event of over-solidification of the cast metal, action is taken on the 'spacing of the cylinders as a function of the spacing force exerted on them by the cast product, this effort being assumed to be representative of the state of solidification of the metal.
  • this method leads to longitudinal variations in the thickness of the strip obtained.
  • This method based on the fact that, if the speed increases, the solidification time of the molten metal in contact with the cylinders is reduced, and therefore the solidification is less (and vice versa), however does not allow to react quickly enough to avoid the problems of over or under solidification which can appear suddenly. Therefore, it can practically only be used in combination with the previous method of adjusting the spacing according to the spacing force.
  • a casting method is also known, according to which the position of the bearings of the cylinders is acted upon to take account of the circularity defects of the surface of the cylinders by measuring these circularity defects and in consequently correcting the position of the bearings as a function of the angle of rotation of the cylinders. This method does not, however, as will be readily understood, solve the problems associated with the state of solidification of the cast metal.
  • the invention relates to a method of regulation for continuous casting between rolls, according to which, during casting, the spacing force of the rolls is measured, and the position of the steps of at least one of the cylinders to increase or decrease the distance between said cylinders, characterized in that, in order to maintain said substantially constant force, a range of force values is predefined surrounding a desired nominal force, and the bearings are acted on more sharply when the value of the force measured is outside of said range than when it is included in said range.
  • the position of the bearings being regulated to a setpoint position, said setpoint position is fixed by a reference position value d r , determined by providing an initial setpoint value d o of position of the bearings a variable corrective value ⁇ d as a function of the difference between the measured spacing force and the nominal force, said corrective value being greater when the measured force is outside of said range than when it is included in the said range.
  • a correction defined by a function f
  • said correction leads to generating an artificial reference position value, which defines a setpoint position offset with respect to the initial setpoint position in the direction conventionally leading to compensate for a variation in the spacing force, c 'is to say in the direction of a spacing of the cylinders in response to an increase in said spacing force and vice versa.
  • this reference position value used as a setpoint for the regulation of the position of the bearings, is then far from the value of the actual measurement of the position of the bearings, this regulation will react more strongly, to move the bearings, than if the setpoint position remained the initial setpoint position.
  • the corrected signal E ′ is increasing as a function of the difference between the spacing force measured and the nominal force.
  • the greater the difference between the measured force and the nominal force the more lively the reaction.
  • the corrected signal is zero when the value of the measured force is included in the said range, and increasing as a function of the difference between the measured separation force and the nominal force when the value of the force measured is outside the said range.
  • the position regulation of the bearings acts normally to maintain the latter at the initial set position, which amounts to tolerating the variations of force without seeking to compensate by a displacement of the bearings, as long as they remain in said range.
  • the action on the position of the bearings will be all the more keen as the force measured moves away from the limits of the range.
  • the correction is reduced after a predetermined starting time.
  • an additional modulation as a function of the casting phase.
  • This modulation makes it possible to further increase the reactivity of the regulation during the start-up period, so as to obtain a stable regime as quickly as possible, and to reduce this reactivity once this substantially stable regime is obtained, so as to avoid that a very short duration peak of effort, occurring after the start-up period, leads to a significant variation in the spacing of the cylinders, as would be the case during the said start-up period.
  • this second modulation applies regardless of whether the force measured is in said range or outside of it.
  • the effort range may be relatively narrow during the start-up period, and then be widened.
  • the casting installation shown only partially in FIG. 1, conventionally comprises, and known per se, two cylinders 1, 2, with parallel axes, spaced from one another by a distance corresponding to l desired thickness of the cast strip.
  • the two cylinders 1, 2 are rotated in opposite directions, at the same speed. They are carried by bearings 3, 4, diagrammatically represented, of two supports 5, 6 mounted on a chassis 7.
  • the support 5, and therefore the axis of the corresponding cylinder 1, is fixed relative to the chassis 7.
  • the other support 6 is movable in translation on the chassis 7. Its position is adjustable and determined by thrust cylinders 9 acting so as to bring the supports apart or away from one another.
  • Means for measuring the force between the cylinders, such as load cells 8, are arranged between the fixed support 5 and the chassis 7. Sensors 10 make it possible to measure the position of the mobile support 6, and therefore the variations in position relative to a predetermined target position as a function of the desired thickness of the strip.
  • the molten metal is poured between the cylinders, and begins to solidify on contact with their cooled walls, forming solidified skins which are driven by the rotation of the cylinders and meet substantially at the neck 11 between the cylinders to form the solidified strip extracted downwards.
  • the metal exerts on the cylinders an RSF spacing force, measured by the load cells 8, this force being variable in particular depending on the degree of solidification of the metal.
  • the thrust cylinders 9 For example, to reduce the spacing effort RSF, one acts on the jacks 9 in the direction leading to a spacing of the cylinders and, conversely, to increase the force, one acts on the jacks in the direction of a bringing together of the cylinders.
  • This action is carried out automatically by a regulation which, according to the invention, makes it possible to obtain a substantially constant spacing force, very quickly after the start of the casting, as well as a thickness of the strip obtained also substantially constant.
  • FIG. 2 The schematic diagram of the regulating loop for the spacing force of the cylinders is illustrated in FIG. 2.
  • the difference E between the value of the spacing force RSF, measured by the load cells 8, and the effort setpoint value RSF 0 is calculated by the calculation unit 20.
  • This difference E is entered into a correction device 22 which determines a corrected value E ′ function of E, according to a relationship which will be described in more detail later.
  • the value E ' is introduced into an adjustable gain amplifier 24 which converts E' to a speed v, proportional to E, which is itself integrated into the integrator 26 to provide a corrective value ⁇ d.
  • the corrective value ⁇ d is introduced into an adder 28 which also receives an initial position setpoint value d 0 and a runout compensation value Cfr, and develops a position reference value d r .
  • the position reference value d r which serves as a reference in the regulation of the position of the bearings, is introduced into a comparator 30 which also receives the measured value d m of the position of the bearings, measured by the sensors 10, and develops a signal E p representing the difference between the actual position of the bearings and the setpoint position.
  • This signal is introduced into a conventional regulation loop 32 (PID) which supplies a signal i sv to a servovalve 34 for controlling the actuators.
  • thrust 9. The actuation of the thrust cylinders acts on the flow of the casting (symbolized by the box "process" 36) during which the value of the spreading force RSF is measured.
  • cycle time of the position regulating loop of the thrust cylinders 9 (loop shown diagrammatically by the dotted frame 36) is, for example, 2.10 -3 seconds while the overall cycle time (dotted frame 38) is for example 10.10 -3 seconds.
  • the correction f provided by the correction device 22 is shown graphically in FIG. 3, in which numerical values of E and E ′, expressed in tonnes, have been indicated only by way of example.
  • the nominal value RSF 0 of the spreading force is 6 T (6 tonnes or approximately 6000 daN), and the range of forces ⁇ RSF is 4 T.
  • the corrective value ⁇ d generated from the value E ' will increase continuously as a function of the difference between the spacing force measured RSF and the nominal force RSF 0 , but moreover increases more strongly as soon as the spacing force leaves the range ⁇ RSF. Consequently, the reactivity of the position regulation of the bearings is somewhat reduced as long as the spacing force measured remains within the said range, and increased or beyond.
  • the gain can also be adjusted as a function of the time elapsed from the start of the casting. It would then follow that the gain would have to be adjusted as a function of two parameters, time and the separation force, which can in practice complicate the implementation of the regulation.
  • E 'as a function of E could also be defined differently, for example E' being zero or substantially zero as long as the spacing force is included in said range, and increasing as a function of E outside of it. ci, as shown in dotted lines in figure 3.
  • the reference position d r would then only be corrected when the spacing force exits from said range, and any variation in force remaining in said range would not cause any displacement of the bearings of the cylinders.
  • the correction made to the reference position of the bearings is reduced after a predetermined starting time, which can be easily achieved by reducing the gain, and therefore the value ⁇ d.
  • the width of the fork can be increased.
  • the method according to the invention incorporates a run-out regulation, to take account of the circularity defects of the cylinders and compensate for them so as not to have cyclic variations thickness of the cast strip.
  • the circularity deviations of the cylinders are determined by measuring the variations in the spacing force as a function of the angle of rotation of the cylinders, this measurement being made during the first turns of the cylinders when starting the casting, and, then, the said reference position value of the bearings is modified as a function of the angle of rotation, to compensate for the said deviations in circularity.
  • the determination of the circularity deviations can be made by a computer which extracts from the curve variations in the measured spacing force, the cyclic variations, significant of circularity defects, and develops a corrective value CFr which is added to the value initial setpoint d 0 and correction ⁇ d for form the position reference value d r .
  • FIGS. 6 and 7 represent two variants of the correction f which can be used by the correction device 22.
  • the range ⁇ RSF is no longer centered on the nominal value RSF 0 , as in the case of FIG. 3, but shifted to the right, that is to say in the direction of increasing forces .
  • the reactivity of the bearing position regulation is reduced, as indicated above, only when the distance force measured RSF is greater than the set point RSF 0 .
  • the regulation acts normally, that is to say more strongly, which avoids an excessively abrupt reduction in the force, and therefore avoids reaching a value d excessively low effort. This is particularly useful when the RSF 0 setpoint is itself low, for example of the order of 2 tonnes.
  • the correction applied when the spacing force remains in the vicinity of the setpoint is similar to that represented in FIG. 3, that is to say providing a reduction in the reactivity of the regulation both that the force measured RSF remains within the predefined ⁇ RSF range.
  • a maximum value E'Max is imposed on the corrected value E ', when the force measured exceeds a certain threshold (defined by Es in FIG. 7).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Vehicle Body Suspensions (AREA)
  • Moulding By Coating Moulds (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP95402810A 1994-12-29 1995-12-14 Verfahren zur Regelung des kontinuierlichen Giessens zwischen Walzen Expired - Lifetime EP0719607B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9415981 1994-12-29
FR9415981A FR2728817A1 (fr) 1994-12-29 1994-12-29 Procede de regulation pour la coulee continue entre cylindres

Publications (2)

Publication Number Publication Date
EP0719607A1 true EP0719607A1 (de) 1996-07-03
EP0719607B1 EP0719607B1 (de) 1999-03-10

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EP95402810A Expired - Lifetime EP0719607B1 (de) 1994-12-29 1995-12-14 Verfahren zur Regelung des kontinuierlichen Giessens zwischen Walzen

Country Status (24)

Country Link
US (1) US5706882A (de)
EP (1) EP0719607B1 (de)
JP (1) JP3702351B2 (de)
KR (1) KR100359321B1 (de)
CN (1) CN1069239C (de)
AT (1) ATE177353T1 (de)
AU (1) AU686912B2 (de)
BR (1) BR9506132A (de)
CA (1) CA2165619C (de)
CZ (1) CZ292139B6 (de)
DE (1) DE69508209T2 (de)
DK (1) DK0719607T3 (de)
ES (1) ES2129785T3 (de)
FI (1) FI110072B (de)
FR (1) FR2728817A1 (de)
GR (1) GR3030241T3 (de)
PL (1) PL178754B1 (de)
RO (1) RO117003B1 (de)
RU (1) RU2141391C1 (de)
SK (1) SK281955B6 (de)
TR (1) TR199501728A1 (de)
TW (1) TW318804B (de)
UA (1) UA27990C2 (de)
ZA (1) ZA9511031B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2755385A1 (fr) * 1996-11-07 1998-05-07 Usinor Sacilor Procede de detection de defauts lors d'une coulee continue entre cylindres
EP1294507A1 (de) * 2000-06-15 2003-03-26 Castrip, LLC Bandgiessmaschine
EP1904247A1 (de) * 2005-06-28 2008-04-02 Nucor Corporation Verfahren zur herstellung eines dünnen gegossenen bands unter verwendung einer zweirollen-giessmaschine und vorrichtung dafür

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US6164366A (en) * 1997-05-28 2000-12-26 Ishikawajima-Harima Heavy Industries Company Ltd. Strip casting apparatus
AU739603B2 (en) * 1997-09-18 2001-10-18 Bluescope Steel Limited Strip casting apparatus
AU737844B2 (en) * 1997-09-18 2001-08-30 Bluescope Steel Limited Strip casting apparatus
DE69814542T2 (de) * 1997-09-18 2004-03-18 Castrip, Llc Bandgiessanlage
EP0903190B1 (de) * 1997-09-18 2003-04-16 Castrip, LLC Bandgiessanlage
KR100333070B1 (ko) * 1997-12-20 2002-10-18 주식회사 포스코 쌍롤식박판주조장치에서의에지댐위치제어방법
KR100314849B1 (ko) * 1997-12-24 2002-01-15 이구택 쌍롤형 박판제조 장치에서의 박판두께 제어방법
AUPP852699A0 (en) * 1999-02-05 1999-03-04 Bhp Steel (Jla) Pty Limited Strip casting apparatus
AUPP852499A0 (en) 1999-02-05 1999-03-04 Bhp Steel (Jla) Pty Limited Casting metal strip
US6837301B2 (en) 1999-02-05 2005-01-04 Castrip Llc Strip casting apparatus
KR100882134B1 (ko) * 2002-07-02 2009-02-06 주식회사 포스코 쌍롤식 박판 주조 공정에서의 롤 압하력 제어 방법
KR100851195B1 (ko) * 2002-07-02 2008-08-08 주식회사 포스코 쌍롤식 박판 주조 공정에서의 롤 압하력 및 롤 갭 제어방법
AT411822B (de) † 2002-09-12 2004-06-25 Voest Alpine Ind Anlagen Verfahren und vorrichtung zum starten eines giessvorganges
AT412072B (de) * 2002-10-15 2004-09-27 Voest Alpine Ind Anlagen Verfahren zur kontinuierlichen herstellung eines dünnen stahlbandes
SE527507C2 (sv) † 2004-07-13 2006-03-28 Abb Ab En anordning och ett förfarande för stabilisering av ett metalliskt föremål samt en användning av anordningen
KR100650561B1 (ko) * 2005-12-20 2006-11-30 주식회사 포스코 주조롤 반발력 제어 방법
US7464746B2 (en) * 2006-08-09 2008-12-16 Nucor Corporation Method of casting thin cast strip
US7650925B2 (en) * 2006-08-28 2010-01-26 Nucor Corporation Identifying and reducing causes of defects in thin cast strip
US20090236068A1 (en) 2008-03-19 2009-09-24 Nucor Corporation Strip casting apparatus for rapid set and change of casting rolls
BRPI0909191A2 (pt) * 2008-03-19 2016-11-01 Nucor Corp aparelho para fundição de tira com posicionamento do rolete de fundição
US20090288798A1 (en) * 2008-05-23 2009-11-26 Nucor Corporation Method and apparatus for controlling temperature of thin cast strip
US7888158B1 (en) * 2009-07-21 2011-02-15 Sears Jr James B System and method for making a photovoltaic unit
RU2704987C1 (ru) * 2016-02-02 2019-11-01 Ниппон Стил Корпорейшн Устройство для выпрямления коробления сляба и способ выпрямления коробления сляба

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Publication number Priority date Publication date Assignee Title
DE898135C (de) * 1948-12-19 1953-11-26 Adolf Reimitz Verfahren zum Herstellen von Blechen, Baendern, Profilen und Rohren aus Metallen durch Giessen duenner Vorprodukte im Walzenspalt
EP0095352A2 (de) * 1982-05-24 1983-11-30 Kawasaki Steel Corporation Verfahren und Vorrichtung zum Herstellen von schnell erhärteten Stahlbändern durch ein Doppelrollensystem
EP0138059A1 (de) * 1983-09-19 1985-04-24 Hitachi, Ltd. Verfahren und Vorrichtung zum Giessen eines Metallbandes zwischen zwei Walzen
EP0194628A2 (de) * 1985-03-15 1986-09-17 Hitachi, Ltd. Giesswalzen-Stranggussmaschine

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JP2697908B2 (ja) * 1989-08-03 1998-01-19 新日本製鐵株式会社 双ロール式連続鋳造機の制御装置
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Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
DE898135C (de) * 1948-12-19 1953-11-26 Adolf Reimitz Verfahren zum Herstellen von Blechen, Baendern, Profilen und Rohren aus Metallen durch Giessen duenner Vorprodukte im Walzenspalt
EP0095352A2 (de) * 1982-05-24 1983-11-30 Kawasaki Steel Corporation Verfahren und Vorrichtung zum Herstellen von schnell erhärteten Stahlbändern durch ein Doppelrollensystem
EP0138059A1 (de) * 1983-09-19 1985-04-24 Hitachi, Ltd. Verfahren und Vorrichtung zum Giessen eines Metallbandes zwischen zwei Walzen
EP0194628A2 (de) * 1985-03-15 1986-09-17 Hitachi, Ltd. Giesswalzen-Stranggussmaschine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2755385A1 (fr) * 1996-11-07 1998-05-07 Usinor Sacilor Procede de detection de defauts lors d'une coulee continue entre cylindres
EP0841112A1 (de) * 1996-11-07 1998-05-13 USINOR SACILOR Société Anonyme Verfahren zum Giessen zwischen Zylindern
US5927375A (en) * 1996-11-07 1999-07-27 Usinor Of Puteaux Continuous casting process between rolls
CN1069240C (zh) * 1996-11-07 2001-08-08 尤辛诺公司 在辊子间连续铸造的方法
EP1294507A1 (de) * 2000-06-15 2003-03-26 Castrip, LLC Bandgiessmaschine
EP1294507A4 (de) * 2000-06-15 2004-06-23 Castrip Llc Bandgiessmaschine
EP1904247A1 (de) * 2005-06-28 2008-04-02 Nucor Corporation Verfahren zur herstellung eines dünnen gegossenen bands unter verwendung einer zweirollen-giessmaschine und vorrichtung dafür
EP1904247A4 (de) * 2005-06-28 2009-08-12 Nucor Corp Verfahren zur herstellung eines dünnen gegossenen bands unter verwendung einer zweirollen-giessmaschine und vorrichtung dafür

Also Published As

Publication number Publication date
CA2165619A1 (fr) 1996-06-30
ATE177353T1 (de) 1999-03-15
ZA9511031B (en) 1996-07-11
PL312081A1 (en) 1996-07-08
CN1069239C (zh) 2001-08-08
RU2141391C1 (ru) 1999-11-20
KR100359321B1 (ko) 2003-02-26
SK281955B6 (sk) 2001-09-11
CN1136984A (zh) 1996-12-04
TR199501728A1 (tr) 1996-10-21
KR960021275A (ko) 1996-07-18
PL178754B1 (pl) 2000-06-30
FR2728817B1 (de) 1997-02-28
AU686912B2 (en) 1998-02-12
BR9506132A (pt) 1997-12-23
JP3702351B2 (ja) 2005-10-05
FI956260A0 (fi) 1995-12-27
DE69508209T2 (de) 1999-11-04
GR3030241T3 (en) 1999-08-31
FI110072B (fi) 2002-11-29
EP0719607B1 (de) 1999-03-10
CZ347495A3 (en) 1996-07-17
DK0719607T3 (da) 1999-10-04
UA27990C2 (uk) 2000-10-16
US5706882A (en) 1998-01-13
FI956260A (fi) 1996-06-30
CZ292139B6 (cs) 2003-08-13
ES2129785T3 (es) 1999-06-16
CA2165619C (fr) 2005-02-08
DE69508209D1 (de) 1999-04-15
TW318804B (de) 1997-11-01
JPH08229640A (ja) 1996-09-10
RO117003B1 (ro) 2001-09-28
SK164395A3 (en) 1998-02-04
AU4074095A (en) 1996-07-04
FR2728817A1 (fr) 1996-07-05

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