EP0841112B1 - Verfahren zum Giessen zwischen Zylindern - Google Patents

Verfahren zum Giessen zwischen Zylindern Download PDF

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Publication number
EP0841112B1
EP0841112B1 EP97402589A EP97402589A EP0841112B1 EP 0841112 B1 EP0841112 B1 EP 0841112B1 EP 97402589 A EP97402589 A EP 97402589A EP 97402589 A EP97402589 A EP 97402589A EP 0841112 B1 EP0841112 B1 EP 0841112B1
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EP
European Patent Office
Prior art keywords
signal
casting
harmonic
representative
comparison
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97402589A
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English (en)
French (fr)
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EP0841112A1 (de
Inventor
Jean-Michel Damasse
Olivier Salvado
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
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Thyssen Stahl AG
USINOR SA
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Publication of EP0841112A1 publication Critical patent/EP0841112A1/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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass

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 molten metal in a casting space defined between two cylinders with parallel axes, cooled and driven rotating in opposite directions.
  • the metal solidifies and the metal skins solidified, entrained by the rotation of the cylinders, meet at the neck between the cylinders, to form said band, pulled down.
  • the casting strip must in particular have a section corresponding, in shape and dimensions, to the desired section, the actual section of the strip being directly function of the space, called air gap, between the cylinders at the neck.
  • thermo-hydraulic molten metal or those known under the name of "shiny bands".
  • This last type of default corresponds to a localized decrease in the surface roughness of the cylinders, which causes variations in strip cooling which can be detected by temperature measurements on the casting strip.
  • the observation of these faults does not can be done only a posteriori, on the strip already formed, and therefore belatedly after their appearance.
  • These defects may damage the surface condition of the cylinders, and all the more so since they are perceived late, these damage can then become irreparable.
  • the object of the present invention is to resolve the problems mentioned above and aims to allow, from of the measurement of the spacing force of the cylinders (RSF), real-time detection of faults, before that an amplification of these defects causes damage irremediable in particular to cylinders.
  • the invention has also intended to allow monitoring of the evolution of these faults, in order to be able to offer the operator corrective actions or interruption of the casting in depending on the severity of said defects.
  • the object of the invention is a continuous casting process between product cylinders thin metals, especially steel, according to which continuous measurement, during the casting, the effort cylinder spacing, and a signal is generated representative of variations in spreading force (RSF) as a function of time, and we act, in particular by function of said signal, on the spacing of the cylinders to compensate for the runout of the cylinders, this process being characterized in that, for the purpose of detecting faults other than the runout of the cylinders, we breaks down said signal into different components harmonics, and we compare these said components harmonics to rank reference harmonics corresponding, the results of said comparison being representative of a fault state of the casting process, and we define, according to the results of said comparison, rules of conduct for the casting process.
  • RSF spreading force
  • the inventors were able to establish, following numerous tests carried out on an industrial scale, there is a certain relationship between variations in signals representative of the spreading force and the appearance of defects during casting.
  • the appearance on a cylinder of the defect called strip brilliant is characterized by the presence of a disturbance on the spreading force signal measured.
  • This disturbance is cyclical and manifests itself at each revolution of the cylinder. It reflects an over-solidification of the product when it goes to the collar and translated by variations in effort which are clearly faster than those that can be generated by example by variations in product thickness solidified.
  • the inventors then imagined making a decomposition into harmonics of said signals so to differentiate in these signals the part that can be attributed to normal runout and that from other causes. They thus verified, by comparison of harmonic components noted during various flows, that although representative signals from the spacing effort varies in particular depending even if it is offset by a compensation system, variations of some harmonic components corresponded to the appearance of defects during casting. It therefore appeared that a analysis, carried out continuously during casting, of these harmonic components could allow, by comparison with a reference obtained experimentally when casting is considered to be faultless, to detect almost real-time deviations revealing such casting faults, much faster than by known methods.
  • the spectrum of the signal representative of the spreading force of cylinders and resulting from the only normal runout is characterized by a harmonic component of rank 0 significant (for example 70% of the total amplitude of the signal) and higher order harmonics in rapid decay (20% for the 1st harmonic, 10% for the 2nd harmonic). We rarely note the presence of higher order harmonics.
  • the distribution of harmonics is different from the above case, the presence of an over-solidification front at level of the shiny strip generating more high harmonics.
  • the amplitude of the harmonic components of rank i will be designated subsequently by h i , and by H i a value representative of the harmonics of rank i considered over a predetermined number of revolutions of the cylinders.
  • an air gap regulation system such as described above
  • RSF effort cylinder spacing
  • the value H i representative of each harmonic of rank i is calculated as being an average value of the amplitudes h i of each harmonic, determined over a given number of revolutions of the cylinders.
  • the value H i representative of each harmonic being calculated as being an average over a given number of turns of the amplitudes measured, this makes it possible to attenuate the effect of random and localized defects in time and space, non-repetitive over several turns cylinder.
  • the system will completely integrate this data after said number of turns, while the effect of harmonics only appearing on a low number of turns, significantly less than said number of turns given, will be considerably reduced.
  • the comparison of the measured signal with a signal of a flow deemed good can be done in different ways.
  • the casting installation shown only partially in Figure 1, includes so conventional, and known per se, two cylinders 1, 2, of axes parallel, spaced from each other by a named distance air gap. It corresponds to the desired thickness of the casting strip, minus the crushing due to the RSF. Both cylinders 1, 2 are rotated in direction opposite, at the same speed. They are carried by bearings 3, 4, schematically represented, of two supports 5, 6 mounted on a chassis 7. Support 5, and therefore the axis of the corresponding cylinder 1 is fixed by 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 from so as to bring the supports 5, 6, one apart the other.
  • Means for measuring the spreading force cylinders such as load cells 8 are arranged between the fixed support 5 and the chassis 7. Sensors 10 measure the position of the mobile support 6, and therefore the position variations with respect to a predetermined set position according to the desired thickness of the strip.
  • 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 a spreading force (RSF), measured by weigh 8, this effort being variable in particular depending the degree of solidification of the metal.
  • RSF spreading force
  • the casting installation includes a regulation system.
  • the difference between the effort setpoint signal and the effort signal measured by the effort sensor 8 is calculated by a first comparator 12.
  • the signal for this difference is introduced into a regulator force 13 which determines a position setpoint signal introduced into a second comparator 14.
  • the force signal measured by the force sensor 8 is also introduced into a runout compensation system 15 which performs a decomposition into harmonics of the force signal and generates signals H 1 , H 2 , H 3 for compensation of each of said harmonics.
  • These signals H 1 , H 2 and H 3 are added to an adder 16 which generates a position correction setpoint signal which is transmitted to the second comparator 14.
  • the output signal from the second comparator 14 is introduced into a third comparator 17 as well as a position signal from the position sensor 10.
  • the output signal from the third comparator 17 is introduced into the position regulator 18 which controls the jacks 9.
  • This cruise control 21 receives a signal from a thickness regulator 22 receiving itself a thickness reference signal, the signal force emitted by the force sensor 8 and the signal position emitted by the position sensor 10.
  • An action on the cylinders 9 is executed automatically by this regulation system, which allows for example to act on the cylinders 9 in the direction leading to a spacing of the cylinders to reduce the spreading force (RSF), or vice versa in the direction a bringing together of the cylinders to increase the effort.
  • this system allows for a at least partial compensation for the normal false round, i.e. to compensate for any existing misalignment between the axis of the ferrule and its axis of rotation as well as irregularities in the shape of a cylinder, that these are of mechanical or thermal origin.
  • the system of regulation then takes these shape defects into account and of coaxiality to give a displacement instruction to thrust cylinders 9 controlling the air gap of the cylinders in order to keep this air gap as constant as possible during the rotation of the cylinders.
  • the values H i are then calculated as indicated above, that is to say by performing an average of the amplitudes h i over a predetermined number of revolutions of the cylinders, for example over the last ten revolutions. It will be noted that the preceding method for calculating the coefficients H i is given only by way of example and is not at all limiting.
  • the values H i representative of each harmonic of rank i can also be calculated as being the effective value of the amplitude h i of the harmonics or any other calculated value characterizing these said harmonics, this calculation being able to be made according to an arithmetic mean, according to the least squares method or any other method.
  • the values H i are representative of the relative amplitude of each harmonic of rank i and of frequency F i .
  • the ratio R f B F / F 0 , F 0 corresponding to the frequency of rotation of the cylinders is then calculated.
  • a comparison of these different calculated criteria during casting with a predetermined threshold allows then to detect for the casting in progress if such fault appears.
  • Figures 3a, 3b, 3c and 3d which show variations of different parameters measured and calculated during a casting process with compensation for runout deemed good
  • Figures 4a, 4b, 4c and 4d which show comparatively the curves obtained during casting with defects in shiny bands.
  • Figures 3a and 4a show the variations of the spacing force of the cylinders expressed in percentage of allowable RSF, measured for 40 minutes from the start of casting.
  • Figures 3b and 4b show the evolution during this time of parameter A, i.e. the average amplitude over 10 turns, in ⁇ m, of the displacement of the bearings of the mobile cylinder controlled by the compensation module of the false round.
  • Figures 3c and 4c show in correspondence evolution of the parameter R.
  • Figures 3d and 4d show in correspondence on the same graph the changes in the values H 0 , H 1 and H 2 , representative of the amplitudes of the harmonics of rank 0, 1 and 2, the first (H 0 ) being represented at the bottom of the diagram. , the second (H 1 ) in the middle and the third (H 2 ) at the top.
  • the invention is not limited to the calculation methods of the various parameters indicated above only at as an example.

Claims (10)

  1. Verfahren zum Stranggießen zwischen Zylindern von dünnen metallischen Produkten, insbesondere aus Stahl, bei dem während des Gießens kontinuierlich der momentane Abstand (RSF) der Zylinder voneinander gemessen und ein Signal der Änderungen des momentanen Abstandes (RSF) als Funktion der Zeit erzeugt und insbesondere als Funktion dieses Signales auf den Abstand der Zylinder eingewirkt wird, um Unrundheiten der Zylinder zu kompensieren, dadurch gekennzeichnet, dass, um andere Fehler als die Unrundheit der Zylinder zu detektieren, das Signal in verschiedene harmonische Komponenten zerlegt wird und diese harmonischen Komponenten mit Referenzharmonischen entsprechender Ordnung verglichen werden, wobei die Ergebnisse dieses Vergleiches einen Fehlerzustand des Gießprozesses repräsentieren, und dass als Funktion der Ergebnisse dieses Vergleiches Regeln zur Fortführung des Gießprozesses definiert werden.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass dem repräsentativen Signal, das aufgrund der Messung der Änderungen des momentanen Abstandes (RSF) ausgegeben wird, ein Signal zugeordnet wird, das als Stellsignal für die Versetzung der Lager eines Zylinders in einer Regelschleife für den Abstand zwischen den Zylindern verwendet wird.
  3. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Fouriertransformation verwendet wird, um das repräsentative Signal für den momentanen Abstand der Zylinder (RSF) in unterschiedliche harmonische Komponenten zu zerlegen.
  4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zur Durchführung des Vergleiches als repräsentativer Wert für jede Harmonische der Ordnung i ein Wert Hi verwendet wird, der dem Mittelwert der Amplituden hi der Harmonischen dieser Ordnung entspricht, die über eine gegebene Anzahl von Abläufen gemessen wurden.
  5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zur Durchführung des Vergleiches ein Schwerpunkt der Harmonischen verwendet wird, wobei dieser Schwerpunkt berechnet wird, indem ein repräsentativer Wert für jede Harmonische mit einem vorbestimmten Koeffizienten gewichtet wird.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass ein Frequenz-Schwerpunkt (Bf) = (Σ(Hi x Fi))/ (ΣHi) berechnet wird, worin der jede Harmonische repräsentierende Wert deren Frequenz Fi ist und der Wichtungskoeffizient Hi die Amplitude der betrachteten Harmonischen ist.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass der Vergleich auf der Basis eines Verhältnisses Rf=Bf/F0 durchgeführt wird, worin F0 die der Rotationsgeschwindigkeit der Zylinder entsprechende Frequenz ist.
  8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Vergleich durchgeführt wird, indem als Vergleichskriterium das Verhältnis Hi/A jeder harmonischen Komponente in bezug auf das den momentanen Abstand repräsentierende Signal verwendet wird, wobei Hi die Amplitude der Harmonischen der Ordnung i und A=ΣHi ist.
  9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass das Ergebnis des Vergleiches durch die Summe Rd = pos(α0-H0/A) + pos(H1/A-α1) +....+ pos(Hi/A-αi) repräsentiert wird.
  10. Verfahren nach einem der Ansprüche 7 oder 9, dadurch gekennzeichnet, dass ein Entscheidungstableau zum Bestimmen der Fortführung des Gießverfahrens als Funktion folgender kritischer Werte verwendet wird:
    A=ΣHi,
    R=(Rf oder Rd),
    E=dR/dt.
EP97402589A 1996-11-07 1997-10-31 Verfahren zum Giessen zwischen Zylindern Expired - Lifetime EP0841112B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9613777 1996-11-07
FR9613777A FR2755385B1 (fr) 1996-11-07 1996-11-07 Procede de detection de defauts lors d'une coulee continue entre cylindres

Publications (2)

Publication Number Publication Date
EP0841112A1 EP0841112A1 (de) 1998-05-13
EP0841112B1 true EP0841112B1 (de) 2000-05-24

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EP97402589A Expired - Lifetime EP0841112B1 (de) 1996-11-07 1997-10-31 Verfahren zum Giessen zwischen Zylindern

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US (1) US5927375A (de)
EP (1) EP0841112B1 (de)
JP (1) JP3907023B2 (de)
KR (1) KR100540617B1 (de)
CN (1) CN1069240C (de)
AT (1) ATE193233T1 (de)
AU (1) AU717254B2 (de)
BR (1) BR9705436A (de)
CA (1) CA2220887C (de)
CZ (1) CZ291523B6 (de)
DE (1) DE69702104T2 (de)
DK (1) DK0841112T3 (de)
ES (1) ES2146072T3 (de)
FR (1) FR2755385B1 (de)
GR (1) GR3033604T3 (de)
PL (1) PL184806B1 (de)
PT (1) PT841112E (de)
RO (1) RO119773B1 (de)
RU (1) RU2169053C2 (de)
SK (1) SK282849B6 (de)
TR (1) TR199701327A2 (de)
TW (1) TW358045B (de)
UA (1) UA62912C2 (de)
ZA (1) ZA979752B (de)

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US7308930B2 (en) * 2006-03-09 2007-12-18 Nucor Corporation Method of continuous casting steel strip
US7556084B2 (en) * 2006-03-24 2009-07-07 Nucor Corporation Long wear side dams
US7503375B2 (en) * 2006-05-19 2009-03-17 Nucor Corporation Method and apparatus for continuously casting thin strip
US7650925B2 (en) * 2006-08-28 2010-01-26 Nucor Corporation Identifying and reducing causes of defects in thin cast strip
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US8028741B2 (en) * 2008-11-06 2011-10-04 Nucor Corporation Strip casting apparatus with improved side dam force control
US8322402B2 (en) * 2009-09-23 2012-12-04 Nucor Corporation Method and apparatus for controlling strip temperature rebound in cast strip
EP2436459A1 (de) * 2010-09-29 2012-04-04 Siemens Aktiengesellschaft Vorrichtung und Verfahren zur Positionierung mindestens einer von zwei Gießrollen in einem kontinuierlichen Gießverfahren zur Herstellung eines Metallbands
JP5837758B2 (ja) 2011-04-27 2015-12-24 キャストリップ・リミテッド・ライアビリティ・カンパニー 双ロール鋳造装置及びその制御方法
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Publication number Publication date
ZA979752B (en) 1998-05-22
KR19980042167A (ko) 1998-08-17
SK282849B6 (sk) 2002-12-03
CA2220887A1 (fr) 1998-05-07
US5927375A (en) 1999-07-27
SK148697A3 (en) 1998-12-02
ATE193233T1 (de) 2000-06-15
TR199701327A3 (tr) 1999-08-23
FR2755385B1 (fr) 1998-12-31
BR9705436A (pt) 1999-05-04
CA2220887C (fr) 2006-03-14
PL184806B1 (pl) 2002-12-31
GR3033604T3 (en) 2000-10-31
KR100540617B1 (ko) 2006-02-28
RU2169053C2 (ru) 2001-06-20
RO119773B1 (ro) 2005-03-30
EP0841112A1 (de) 1998-05-13
JP3907023B2 (ja) 2007-04-18
JPH10146652A (ja) 1998-06-02
AU717254B2 (en) 2000-03-23
TR199701327A2 (xx) 1999-08-23
PT841112E (pt) 2000-09-29
CZ291523B6 (cs) 2003-03-12
CZ351397A3 (cs) 1998-07-15
FR2755385A1 (fr) 1998-05-07
CN1194895A (zh) 1998-10-07
ES2146072T3 (es) 2000-07-16
PL323065A1 (en) 1998-05-11
DE69702104T2 (de) 2001-02-15
TW358045B (en) 1999-05-11
DK0841112T3 (da) 2000-09-11
CN1069240C (zh) 2001-08-08
UA62912C2 (en) 2004-01-15
DE69702104D1 (de) 2000-06-29
AU4361197A (en) 1998-05-14

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