EP0719607B1 - 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
EP0719607B1
EP0719607B1 EP95402810A EP95402810A EP0719607B1 EP 0719607 B1 EP0719607 B1 EP 0719607B1 EP 95402810 A EP95402810 A EP 95402810A EP 95402810 A EP95402810 A EP 95402810A EP 0719607 B1 EP0719607 B1 EP 0719607B1
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EP
European Patent Office
Prior art keywords
force
rsf
value
measured
band
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP95402810A
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English (en)
French (fr)
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EP0719607A1 (de
Inventor
Gilles Fellus
Olivier Salvado
Yves Leclercq
François Mazodier
Luc Vendeville
Yann Breviere
Georges Mercier
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Thyssen Stahl AG
USINOR SA
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Thyssen Stahl AG
USINOR SA
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Publication of EP0719607A1 publication Critical patent/EP0719607A1/de
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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
    • 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 metal products, in particular in steel.
  • the product produced for example a thin steel strip of a few millimeters thick, is obtained by pouring the metal molten in a casting space defined between two cylinders of parallel axes, cooled and driven in counterclockwise rotation.
  • the metal solidifies and the metal skins solidified, driven by the rotation of the cylinders, join at the neck between the cylinders, to form the said strip, extracted downwards.
  • the casting 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 i.e. the distance between the two cylinders, or substantially equal to the desired thickness Of the band.
  • the thickness accuracy is less important than its regularity over the entire length of the strip. So a deviation of a few tenths of a millimeter over the thickness relative to the desired thickness is not detrimental to obtaining a quality finished product, after rolling, while rapid variations thickness along the longitudinal direction of the strip casting may affect the finished product, despite said rolling.
  • the main constraint is of course to get a continuous strip, and therefore it is necessary to ensure the strip extraction, and that this strip is sufficiently solidified during its extraction.
  • Over-solidification metal upstream of the neck is not necessarily harmful in the case of metal casting relatively malleable, for example aluminum, but it is unacceptable for harder metals, such as steel, because then such over-solidification leads either the formation of a metal wedge above the neck, preventing extraction, i.e. deterioration of cylinders when excessively passing metal between them solidified.
  • the object of the invention is a regulation process for continuous casting between cylinders, according to which, during casting, we measure the spacing force of the cylinders, and we act on the position of the bearings of at least one of the cylinders for increase or decrease the distance between the said cylinders, characterized in that, in order to maintain said effort substantially constant, we predefine a range of force values framing a desired nominal force, and we act on the position of the bearings more sharply when the value of the measured effort is outside the said range only when included in the said fork.
  • account is taken the size of the gap between the spreading effort measured and the nominal effort desired to act on the position of the cylinder bearings: as long as the force stays within the predetermined range, that is, it deviates relatively little from the nominal force value, the reaction of moving the bearings of the cylinders to compensate for this variation in effort will moderate, or even zero, while if the effort comes out of the said fork, the reaction will be more intense.
  • 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 from the initial set position in driving direction conventionally to compensate for a variation in effort spacing, i.e. in the direction of a spacing cylinders in response to an increase in said force spacing and vice versa.
  • this value of reference position used as a setpoint for the bearing position regulation, is then far from the value of the actual position measurement of levels, this regulation will react more strongly, to move the bearings, only if the set position was remained the initial setpoint position.
  • the signal corrected E ' is increasing according to the difference between the measured spacing force and the nominal force.
  • the signal corrected is zero when the value of the measured effort is included in the said range, and increasing in function of the difference between the measured separation force and nominal force when the value of the measured force is outside the said range.
  • the bearing position regulation acts normally to keep these at the initial set position, this which amounts to tolerating variations in effort without seek to compensate for them by a displacement of the bearings, as long as they stay in the said range.
  • the action on the position of the bearings will be all the more vivid as the force measured moves away from the limits of the range.
  • the correction is reduced after a start-up time predetermined.
  • additional modulation depending on the casting phase.
  • This modulation allows to further increase the reactivity of regulation during the start-up period, so as to obtain the most quickly as possible a stable diet, and reduce this reactivity once this substantially stable regime is obtained, so as to avoid while a peak of effort of very short-term, occurring after the start-up period, lead to a significant variation in the spacing of cylinders, as would be the case during the so-called start-up period.
  • this second modulation applies regardless of whether the effort measured either in the said range or out of it.
  • the range of effort may be relatively narrow during the start-up period, and then be enlarged.
  • the casting installation shown only partially in Figure 1, includes so conventional, and known per se, two cylinders 1, 2, of axes parallel, spaced apart from each other by a distance corresponding to the desired thickness of the casting strip.
  • the two cylinders 1, 2 are rotated in direction otherwise, at the same speed. They are carried by bearings 3, 4, schematically 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 together or move the supports away from each other.
  • Means of measurement of the spacing force of 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 setpoint position predetermined according to the desired thickness of the bandaged.
  • the molten metal is spilled between the cylinders, and begins to solidify at contact of their cooled walls by forming skins solidified which are driven by the rotation of cylinders and meet substantially at the neck 11 between the cylinders to form the solidified strip pulled down.
  • the metal exerts on the cylinders an RSF spacing force, measured by the weigh 8, this effort being variable in particular depending the degree of solidification of the metal.
  • This action is performed automatically by a regulation which, according to the invention, makes it possible to obtain a substantially constant spreading effort, very quickly after the start of casting, as well as a thickness of the band 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 provides a signal i sv to a servovalve 34 for controlling the thrust cylinders 9.
  • PID conventional regulation loop 32
  • the actuation of the thrust cylinders acts on the course of the casting (symbolized by the "process" box 36) during which the value of the RSF spacing force 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 set according to the time elapsed from start of casting. It would then follow that the gain should be set according to two parameters, the time and the spacing effort, which can in practice complicate the implementation of regulation.
  • E 'as a function of E could also be defined differently, for example E 'being zero or substantially zero as long as the spreading force is included in the said range, and increasing in function of E outside of it, as shown in dotted lines in figure 3.
  • the reference position d r would then be corrected only when the spacing force would come out of said range, and any variation of 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 start-up time, which can be easily achieved by decreasing the gain, and therefore the value ⁇ d.
  • the width of the fork can be increased.
  • the method according to the invention incorporates a runout regulation, to take account of faults circularity of the cylinders and compensate them so as not to no cyclic variations in strip thickness casting.
  • 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 to 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 spreading force remains in the vicinity of the setpoint is similar to that shown FIG. 3, that is to say providing a reduction in the reactivity of the regulation as long as the effort 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 Figure 7). So while retaining a strong reactivity of the regulation when the effort measured comes out of the ⁇ RSF range, a gap is avoided excessive cylinders in response to a peak of effort very high but very brief, and therefore we provide a more cylinders in their normal position as soon as the peak effort has passed.

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  • 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)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Moulding By Coating Moulds (AREA)

Claims (11)

  1. Regelungsverfahren für den Strangguß zwischen Walzen, gemäß dem während des Gusses die Walzenspreizkraft (RSF) gemessen wird und auf die Position der Lager wenigstens einer der Walzen eingewirkt wird, um den Achsabstand zwischen diesen Walzen zu vergrößern oder zu verkleinern, dadurch gekennzeichnet, daß, um diese Kraft im wesentlichen konstant zu halten, ein Kraftwertebereich (ΔRSF) vorbestimmt wird, der eine gewünschte Nennkraft (RSF0) umgibt, und schneller auf die Position der Lager eingewirkt wird, wenn der Wert der gemessenen Kraft außerhalb dieses Bereichs liegt, als wenn er innerhalb dieses Bereichs liegt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Position der Lager anhand einer Sollposition geregelt wird und diese Sollposition durch einen Bezugspositionswert (dr) festgelegt wird, der bestimmt wird, indem auf einen anfänglichen Sollwert (do) für die Position der Lager ein Korrekturwert (Δd) angewendet wird, der in Abhängigkeit von der Differenz zwischen der gemessenen Spreizkraft (RSF) und der Nennkraft (RSF0) veränderlich ist, wobei die Korrektur (Δd) größer ist, wenn der Wert der gemessenen Kraft außerhalb des Bereichs liegt, als wenn er innerhalb des Bereichs liegt.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der Korrekturwert (Δd) anhand eines korrigierten Signals (E') berechnet wird, das erhalten wird, indem an der Differenz (E) zwischen der gemessenen Spreizkraft (RSF) und der Nennkraft (RSF0) eine Korrektur, definiert durch eine Funktion (f), vorgenommen wird.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß das korrigierte Signal (E') in Abhängigkeit von der Differenz zwischen der gemessenen Spreizkraft (RSF) und der Nennkraft (RSF0) wächst.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß das korrigierte Signal (E') schneller wächst, wenn der Wert der gemessenen Kraft (RSF) außerhalb des Bereichs (ΔRSF) liegt, als wenn er innerhalb des Bereichs liegt.
  6. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß das korrigierte Signal (E') Null ist, wenn der Wert der gemessenen Kraft (RSF) innerhalb des Bereichs (ΔRSF) liegt, und in Abhängigkeit von der Differenz zwischen der gemessenen Spreizkraft und der Nennkraft wächst, wenn der Wert der gemessenen Kraft außerhalb des Bereichs liegt.
  7. Verfahren nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, daß der Bereich (ΔRSF) in bezug auf die Nennkraft (RSF0) in Richtung wachsender Kräfte verschoben ist.
  8. Verfahren nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß dem korrigierten Wert (E') ein Höchstwert (E'Max) auferlegt wird, wenn der Wert der gemessenen Kraft (RSF) eine vorbestimmte Schwelle (Es) überschreitet.
  9. Verfahren nach einem der Ansprüche 2 bis 8, dadurch gekennzeichnet, daß die Korrektur (Δd) nach einer vorbestimmten Anlaufdauer verringert wird.
  10. Verfahren nach einem der Ansprüche 2 bis 9, dadurch gekennzeichnet, daß der Kraftbereich (ΔRSF) nach einer vorbestimmten Anlaufdauer verbreitert wird.
  11. Verfahren nach einem der Ansprüche 2 bis 10, dadurch gekennzeichnet, daß man die Rundheitsabweichungen der Walzen durch Messung der Änderungen der Spreizkraft (RSF) in Abhängigkeit von dem Drehwinkel der Walzen bestimmt, wobei diese Messung während der ersten Umdrehungen der Walzen beim Start des Gusses erfolgt, und man anschließend den Positionsbezugswert (dr) für die Lager in Abhängigkeit von dem Drehwinkel modifiziert, um diese Rundheitsabweichungen zu kompensieren.
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
FR9415981A FR2728817A1 (fr) 1994-12-29 1994-12-29 Procede de regulation pour la coulee continue entre cylindres
FR9415981 1994-12-29

Publications (2)

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

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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)

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KR100333070B1 (ko) * 1997-12-20 2002-10-18 주식회사 포스코 쌍롤식박판주조장치에서의에지댐위치제어방법
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US6837301B2 (en) 1999-02-05 2005-01-04 Castrip Llc Strip casting apparatus
AUPP852499A0 (en) 1999-02-05 1999-03-04 Bhp Steel (Jla) Pty Limited Casting metal strip
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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
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US7168478B2 (en) * 2005-06-28 2007-01-30 Nucor Corporation Method of making thin cast strip using twin-roll caster and apparatus therefor
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
CN102015155B (zh) * 2008-03-19 2013-11-27 纽科尔公司 使用铸辊定位的带材铸造设备
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
WO2017135390A1 (ja) * 2016-02-02 2017-08-10 新日鐵住金株式会社 鋳片反り検出装置、及び鋳片の反り検出方法

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Publication number Publication date
FR2728817B1 (de) 1997-02-28
SK281955B6 (sk) 2001-09-11
AU4074095A (en) 1996-07-04
CA2165619C (fr) 2005-02-08
CA2165619A1 (fr) 1996-06-30
PL178754B1 (pl) 2000-06-30
TW318804B (de) 1997-11-01
ES2129785T3 (es) 1999-06-16
RO117003B1 (ro) 2001-09-28
FR2728817A1 (fr) 1996-07-05
SK164395A3 (en) 1998-02-04
PL312081A1 (en) 1996-07-08
DE69508209D1 (de) 1999-04-15
FI956260A0 (fi) 1995-12-27
CN1069239C (zh) 2001-08-08
GR3030241T3 (en) 1999-08-31
KR960021275A (ko) 1996-07-18
EP0719607A1 (de) 1996-07-03
JPH08229640A (ja) 1996-09-10
RU2141391C1 (ru) 1999-11-20
CZ347495A3 (en) 1996-07-17
ATE177353T1 (de) 1999-03-15
AU686912B2 (en) 1998-02-12
KR100359321B1 (ko) 2003-02-26
CZ292139B6 (cs) 2003-08-13
FI956260A (fi) 1996-06-30
TR199501728A1 (tr) 1996-10-21
ZA9511031B (en) 1996-07-11
DE69508209T2 (de) 1999-11-04
US5706882A (en) 1998-01-13
BR9506132A (pt) 1997-12-23
CN1136984A (zh) 1996-12-04
JP3702351B2 (ja) 2005-10-05
UA27990C2 (uk) 2000-10-16
FI110072B (fi) 2002-11-29
DK0719607T3 (da) 1999-10-04

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