EP0867245B1 - Methode zur Regelung der Rollen-Rotationsgeschwindigkeit beim Rollengiessverfahren - Google Patents

Methode zur Regelung der Rollen-Rotationsgeschwindigkeit beim Rollengiessverfahren Download PDF

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Publication number
EP0867245B1
EP0867245B1 EP98470003A EP98470003A EP0867245B1 EP 0867245 B1 EP0867245 B1 EP 0867245B1 EP 98470003 A EP98470003 A EP 98470003A EP 98470003 A EP98470003 A EP 98470003A EP 0867245 B1 EP0867245 B1 EP 0867245B1
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EP
European Patent Office
Prior art keywords
roll
nip
speed
difference
vtc
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
EP98470003A
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English (en)
French (fr)
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EP0867245A1 (de
Inventor
Jean-Michel Cabinet Ballot Schmit Damasse
Olivier Cabinet Ballot Schmit 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 EP0867245A1 publication Critical patent/EP0867245A1/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

Definitions

  • the present invention relates to continuous casting between cylinders of thin metal products, such as steel strips. It relates more particularly a method of regulating the speed of rotation of cylinders.
  • the continuous casting process between cylinders consists in pouring a molten metal into a casting space, defined between two axis cylinders parallel and rotated in opposite directions.
  • the metal solidifies on contact with the cooled walls of cylinders, thus forming solidified metal skins which are driven by the cylinders and meet at the level of the neck between the cylinders, located in the plane of the cylinder axes, to form a metal strip which is continuously pulled down.
  • the cylinders are driven in rotation with respective rotational speeds substantially equal and the band comes out below the neck perpendicular to the plane of the axes of the cylinders.
  • Such a process essentially aims to avoid longitudinal variations in the thickness of the strip.
  • the tape is kept in contact with a first cylinder after passing through neck, over a certain arc length, in order to increase the duration of cooling of the strip in contact with the cold wall of the cylinder.
  • He is then known, as the describes document JP-A-2 290 651, to train the second cylinder (the one in contact with which the strip does not not stay) at a higher speed than the first cylinder, to take into account the curvature of the band below the neck and the thickness of the band casting.
  • the bending of the strip on the first cylinder causes a variation in the length of the faces of the strip so that the face of the strip located on the side of the second cylinder, called upper surface, has a length greater than that of the face located on the side of the first cylinder.
  • the aforementioned document further proposes to adjust the speed of the second cylinder according to thickness variations of the tape so that the linear velocity of the upper surface of the strip, which is determined by the speed second cylinder peripheral, always such that the two skins have the same angular speed.
  • the object of the present invention is to resolve these problems. It aims in particular to regulate the speed of rotation of the cylinders so that their speeds tangentials at the neck are exactly equal permanently, despite the geometric deformations of cylinders, that these deformations are original thermal or mechanical. It also aims to avoid the appearance of shear stresses in the band, which could be generated by velocities different tangentials on each cylinder at level neck, and to avoid deterioration of the surface finish cylinders, following a sliding of the skin of band on the cylinders, detrimental to the quality of the final product.
  • the object of the invention is a method of regulating the speed of rotation of cylinders, during a casting operation in a continuous casting installation between cylinders, the so-called installation comprising two cylinders with parallel axes defining between them a neck located in the plane of the axes cylinders, this process being characterized in that the speed of rotation of each cylinder is controlled a parameter representative of its tangential speed at neck, so that the tangential velocities at the neck of two cylinders are equal.
  • the invention therefore makes it possible to ensure an exact equality of tangential speeds at the neck of the two cylinders, and therefore equal drive speeds for both sides of the casting strip. Because these tangential velocities at the neck cannot be practically directly measured, the invention uses to determine these speeds a parameter which is representative.
  • the parameter representative of the difference of the tangential speeds at the neck of each cylinder is developed from the measurement of a torque difference between the value of the respective drive couples of each cylinder. More specifically, we then use a parameter representing the difference between the drive torques of the two cylinders.
  • each cylinder being generally driven in rotation by a specific electric motor, a measurement of the intensity I 1 and I 2 of the electric current of each motor will preferably be used, variations in the difference of the values of the intensities of the two motors being representative of variations in the difference between the drive pairs of the two cylinders.
  • the two cylinders are normally driven at rotational speeds respective such as their linear speeds devices are equal. It may be that couples are not equal, due to example of the specific characteristics of the chain drive kinematics of each cylinder. Through example, inertia or friction characteristics different for the two cylinders can make that engine torques are different to obtain equal speeds.
  • the speed tangential to the neck of a cylinder determines the speed of the skin of the band solidified in contact with this cylinder. If the tangential speeds at the neck of the two cylinders are equal, any one of the cylinders does not influence on the other, from the point of view of speed and of the rotating drive torque.
  • the first cylinder exerts a band drive effort which is transmitted to the other cylinder by the material of the strip which is at least partially solidified at the level of the collar.
  • the second cylinder is then in some so driven by friction by the first cylinder, via the casting strip. This results in a decrease in proper torque necessary for the rotational drive of the second cylinder, correlatively with an increase of the engine torque of the first cylinder.
  • the method according to the invention exploits the gap between the couples thus created, i.e. the variation in the share of each torque compared to the sum of the driving torques of the two cylinders, as a parameter representative of a difference between the tangential velocities at the col des two cylinders.
  • the continuous casting system shown Figure 1 has a frame 3 supporting a cylinder 1 which rotates in bearings linked to the chassis 3.
  • the cylinder 1 is rotated by a motor electric drive 10.
  • the cylinder 2 is also rotated by a electric drive motor 11. Cylinders, which do not are not shown and which are linked to the mobile support 4, make it possible to provide a contrary reaction force to the thrust generated by the product poured on each cylinder.
  • the molten metal 7 is poured between cylinders 1 and 2 and solidifies at contact of the cooled walls of each cylinder.
  • skins 5 and 6 of solidified metal are formed and join at level 8, located in the plane of axes of cylinders 1 and 2.
  • the metal strip 9 thus formed is then continuously extracted downwards, driven by the rotation of cylinders 1 and 2.
  • this representative parameter is a peripheral speed Vt 1 , Vt 2 which is measured on each cylinder at a measurement point A, B, distant from the neck.
  • the peripheral speeds Vt 1 and Vt 2 could be measured by laser beam measuring devices 21, 22.
  • Vtc-Vt ⁇ * (r c -r t ), where ⁇ is the speed of rotation of the cylinder, r c is the radius at the neck and r t is the radius at the chosen measurement point.
  • the difference in radii (r c -r t ) is determined by calculating the deformation of the cylinder wall, based on experimental measurement results and modeling of the cylinder deformation.
  • peripheral speed measurement can be carried out at any point accessible during the course casting, for example at 135 ° from the neck as shown Figures 1 and 2, or 180 ° from the neck.
  • Figure 3 shows another embodiment in which the representative parameter is a difference tangential speeds at the neck of each cylinder, developed from the measurement of a torque difference between the value of the torques of the drive motors 10 and 11 of each cylinder.
  • the continuous casting installation includes measuring means 12 and 13, such as Hall effect current sensors, which measure the intensities I 1 and I 2 of the respective currents of the drive motors 10 and 11.
  • the measured values of the currents I 1 and I 2 are images of the values of the torques supplied by each engine 10, 11 and therefore of the drive torques of the cylinders.
  • the measured values of the currents I 1 and I 2 are introduced into a regulation circuit 14 which makes it possible to apply, to each cylinder, a correction to predetermined speed setpoints.
  • This regulation circuit includes a subtractor 15 making it possible to obtain I 1 -I 2 . Then, a subtractor 16 subtracts at the output of the subtractor 15 a predetermined setting value ⁇ i. The determination of such a setting value ⁇ i is necessary to take into account the fact that, even in ideal conditions where the speeds at the neck would be equal and where the driving force of the two solidified skins would also be equal, a difference between the intensities I 1 and I 2 may exist, because the characteristics of the kinematic chains of the two cylinders cannot be practically absolutely identical.
  • the setting value ⁇ i is for example determined before casting, by a no-load measurement, that is to say excluding casting, of the intensities I 1 and I 2 of each motor, under conditions such that the speeds tangential to the necks are equal. .
  • a no-load measurement that is to say excluding casting
  • the output of the subtractor 16 is connected to a regulator 19 which supplies a correction signal ⁇ V to two comparators 17, 18. These comparators also receive a speed reference signal V 0 , corresponding to the desired average speed V of the strip.
  • Comparator 17 is a subtractor which determines the speed of rotation V 1 of the first cylinder by subtracting the speed correction ⁇ V from the set point V 0 .
  • Comparator 18 is an adder which determines the speed of rotation V 2 of the second cylinder by adding the speed correction ⁇ V to the set point V 0 .
  • the speed correction acts on the two cylinders in opposite directions, without modifying the desired average speed.
  • an initial ⁇ i can also be determined by measurements of the intensities I 1 and I 2 made at the start of casting, during the first turns of the cylinders, while then considering that the tangential speeds at the neck are equal. Subsequently, during casting, the value of ⁇ i can be corrected and optimized taking into account the measurements of I 1 , I 2 and their changes, by processing these data statistically.
  • the setting value ⁇ i can also be corrected manually or automatically, depending on the possible detection of cracks or other faults appearing on the tape.
  • the regulation circuit 14 thus calculates two corrected values V 1 and V 2 of the speed of rotation, taking account of a difference between ⁇ i and I 1 -I 2 .
  • the invention is not limited to the mode of achievement which has been described above only as a example.
  • the value of couples of each cylinder could be determined by means other than measurement sensors motor currents, for example by sensors of torque placed directly on the trees of drive cylinders.
  • peripheral speed measurement in the case of the first embodiment of the invention, may be carried out by means other than laser beam sensor but however sensors of contactless measurement.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Control Of Velocity Or Acceleration (AREA)
  • Paper (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Claims (10)

  1. Verfahren zur Steuerung der Rotationsgeschwindigkeit der Walzen während des Gießens zwischen Walzen einer Stranggußanlage, wobei die Anlage zwei achsparallele Walzen (1, 2) aufweist, zwischen denen eine Engstelle (8) besteht, die in der die Achsen der Walzen durchsetzenden Ebene angeordnet ist, dadurch gekennzeichnet, dass die Rotationsgeschwindigkeit einer jeden Walze an einen Parameter gekoppelt wird, der die Differenz der Tangentialgeschwindigkeiten (Vtc1, Vtc2) an der Engstelle für jede Walze darstellt, derart, dass die Tangentialgeschwindigkeiten der beiden Walzen an der Engstelle gleich groß sind.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der die Differenz der Tangentialgeschwindigkeiten an der Engstelle für jede Walze darstellende Parameter eine Differenz der gemessenen Umfangsgeschwindigkeiten (Vt) für jede Walze an einer von der Engstelle entfernten Meßstelle (A, B) ist, wobei die Tangentialgeschwindigkeit (Vtc) an der Engstelle für jede Walze eine Funktion der gemessenen Umfangsgeschwindigkeit (Vt) ist, gemäß der Beziehung: Vtc-Vt=ω*(rc-rt), wobei ω die Rotationsgeschwindigkeit der Walze, rc der Radius auf Höhe der Engstelle und rt der Radius an der Meßstelle ist und (rc-rt) durch eine Berechnung der Verformung der Walzenwand zwischen der Meßstelle und der Engstelle bestimmt werden kann.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass es die folgenden Schritte aufweist:
    (A) - für jede Walze wird:
    (a) - die Umfangsgeschwindigkeit (Vt1 bzw. Vt2) der Walze (1, 2) an einer von der Engstelle (A, B) entfernten Meßstelle gemessen,
    (b) - die Verformung der Wand der Walze (1, 2) zwischen der Meßstelle (A, B) und der Engstelle (8) berechnet, um die Differenz der Radien (rc1-rt1, bzw. rc2-rt2) zu bestimmen,
    (c) - die Rotationsgeschwindigkeit (ω1 bzw. ω2) der Walze gemessen,
    (d) - ein Wert der Tangentialgeschwindigkeit an der Engstelle durch die Beziehung: Vtc1=ω1*(rc1-rt1') +Vt1 bzw. Vtc2=ω2*(rc2-rt2)+Vt2 berechnet und
    (B)- es werden die berechneten Werte der Tangentialgeschwindigkeiten (Vtc1 bzw. Vtc2) an der Engstelle verglichen, wobei wenn die Differenz ungleich Null ist, die Rotationsgeschwindigkeit einer der beiden Walzen derart eingestellt wird, dass die berechneten Werte der Tangentialgeschwindigkeiten (Vtc1) und (Vtc2) an der Engstelle gleich groß sind.
  4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass eine Laservorrichtung (21, 22) verwendet wird zur Messung des Wertes des darstellenden Parameters an einer von der Engstelle entfernten Meßstelle.
  5. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass zur Bestimmung der Längendifferenz der Radien zwischen der Meßstelle und der Engstelle ein Rechenmodell für die Verformung der Walze verwendet wird, das erstellt wird, ausgehend von experimentellen Kurven der Verformungen der Mantellinie der Walze zwischen der Meßstelle und der Engstelle.
  6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der die Differenz der Tangentialgeschwindigkeiten an der Engstelle für jede Walze darstellende Parameter erstellt wird, ausgehend von der Messung einer Momentenabweichung zwischen den Werten der entsprechenden Antriebsmomente für jede Walze.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass der Wert der Momente bestimmt wird, ausgehend von der Messung der Intensitäten (I1, I2) der entsprechenden, jedem Antriebsmotor (10 und 11) für die Walzen zurgeführten Ströme.
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass es die folgende Schritte aufweist:
    es werden die Intensitäten (I1) und (I2) der Ströme gemessen, die den Antriebsmotoren der Walzen (1, 2) zugeführt werden,
    es wird die Differenz der Ströme (I1-I2) berechnet,
    es wird die Differenz der Ströme (I1-I2) mit einem Steuerwert (δi) verglichen, wobei wenn die Differenz ungleich Null ist, die Rotationsgeschwindigkeiten der beiden Walzen mit einer Korrektur beaufschlagt wird, die ausgehend von der Abweichung zwischen (I1-I2) und (δi) bestimmt wird.
  9. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass es die folgenden Schritte aufweist:
    es werden die Intensitäten (I1) und (I2) der Ströme gemessen, die den Antriebsmotoren der Walzen (1, 2) zugeführt werden,
    es wird die Summe (I1+I2) berechnet,
    es werden die Verhältnisse (I1/I1+I2) und (I2/I1+I2) berechnet,
    es werden die beiden Verhältnisse mit einem Steuerwert verglichen, um die Größe der Abweichung eines jeden Stromes (I1) und (I2) zu bestimmen und danach die Rotationsgeschwindigkeit einer jeden Walze (1) und (2) einzuregeln.
  10. Verfahren nach einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, dass der Steuerwert während des Stranggußverfahrens einstellbar ist.
EP98470003A 1997-01-22 1998-01-20 Methode zur Regelung der Rollen-Rotationsgeschwindigkeit beim Rollengiessverfahren Expired - Lifetime EP0867245B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9700808A FR2758487B1 (fr) 1997-01-22 1997-01-22 Procede de regulation de la vitesse de rotation des cylindres lors d'une operation de coulee continue entre cylindres
FR9700808 1997-01-22

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Publication Number Publication Date
EP0867245A1 EP0867245A1 (de) 1998-09-30
EP0867245B1 true EP0867245B1 (de) 2000-04-26

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EP98470003A Expired - Lifetime EP0867245B1 (de) 1997-01-22 1998-01-20 Methode zur Regelung der Rollen-Rotationsgeschwindigkeit beim Rollengiessverfahren

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EP (1) EP0867245B1 (de)
AT (1) ATE192053T1 (de)
DE (1) DE69800125T2 (de)
DK (1) DK0867245T3 (de)
ES (1) ES2146490T3 (de)
FR (1) FR2758487B1 (de)
GR (1) GR3033782T3 (de)
PT (1) PT867245E (de)

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Publication number Priority date Publication date Assignee Title
DE102006050225A1 (de) 2006-10-12 2008-04-17 Bos Gmbh & Co. Kg Wellenanordnung
US7984748B2 (en) * 2008-07-03 2011-07-26 Nucor Corporation Apparatus for continuous strip casting

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH657291A5 (de) * 1982-08-12 1986-08-29 Alusuisse Verfahren und vorrichtung zum antreiben und synchronisieren von walzen.
US4727927A (en) * 1987-01-20 1988-03-01 Hunter Engineering Company, Inc. Casting machine control
JPH0796146B2 (ja) * 1989-04-27 1995-10-18 新日本製鐵株式会社 薄肉鋳片の連続鋳造方法及び装置

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FR2758487A1 (fr) 1998-07-24
DK0867245T3 (da) 2000-09-25
ES2146490T3 (es) 2000-08-01
GR3033782T3 (en) 2000-10-31
DE69800125T2 (de) 2001-01-11
ATE192053T1 (de) 2000-05-15
EP0867245A1 (de) 1998-09-30
DE69800125D1 (de) 2000-05-31
PT867245E (pt) 2000-09-29
FR2758487B1 (fr) 1999-04-09

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