EP0391822B1 - Procédé et dispositif d'obtention de produits métalliques minces par coulée continue - Google Patents

Procédé et dispositif d'obtention de produits métalliques minces par coulée continue Download PDF

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Publication number
EP0391822B1
EP0391822B1 EP90470007A EP90470007A EP0391822B1 EP 0391822 B1 EP0391822 B1 EP 0391822B1 EP 90470007 A EP90470007 A EP 90470007A EP 90470007 A EP90470007 A EP 90470007A EP 0391822 B1 EP0391822 B1 EP 0391822B1
Authority
EP
European Patent Office
Prior art keywords
product
magnetic field
rolls
value
separation force
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
EP90470007A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0391822A1 (fr
Inventor
Roger Ventavoli
Daniel Neyret
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.)
Techmetal Promotion SA
Original Assignee
Techmetal Promotion 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 Techmetal Promotion SA filed Critical Techmetal Promotion SA
Publication of EP0391822A1 publication Critical patent/EP0391822A1/fr
Application granted granted Critical
Publication of EP0391822B1 publication Critical patent/EP0391822B1/fr
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
    • B22D11/16—Controlling or regulating processes or operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating strands
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields

Definitions

  • the invention relates to obtaining thin metallic products directly by continuous casting. It relates more particularly to obtaining thin steel slabs, that is to say flat products whose final thickness rarely exceeds 100-120 mm, but is most often around 20-50 mm.
  • Continuous casting installations for steel slabs having these small thicknesses are distinguished from continuous casting installations for slabs of standard thickness (of the order of 150-200 mm), in particular by the presence, downstream of the ingot mold in the direction of extraction of the product, from at least one pair of rollers, called pinch rollers. These have the role of bringing, without actual rolling, the product to its final thickness after it leaves the ingot mold, by only bringing the large faces of the cast product together.
  • the ingot mold the design of which derives from that of conventional continuous casting ingot molds, does not in fact make it possible to directly obtain the desired small thicknesses.
  • the spacing of the pinch rollers is fixed, in principle, throughout the casting and equal to the thickness desired for the product. They exert their grip on the product so as to bring about the early closure of the liquid well. On leaving the rolls, the product is therefore normally fully solidified throughout its section. In any case, it no longer has a completely liquid heart.
  • a problem to be solved in the operation of such a machine is the adjustment of the depth of the liquid well (also called "metallurgical height").
  • pinch rollers are designed to shape a product whose core is still liquid. If the liquid well closes upstream of the pinch rollers, these must therefore act on a product which is entirely solid or pasty state. To bring the product to the desired thickness, they will have to undergo a severe spacing effort on the part of the product, which in fact amounts to real rolling on a solid product. Such an effort, if it is too great, or if it is repeated too frequently and for too long, can cause serious damage to the rollers themselves and to their holding members.
  • a machine capable of withstanding such large spacing forces would be hardly compatible in size with the rest of the casting installation, because of the great rigidity of the frame which would be necessary. In any event, its cost would be much higher than that of a normal installation.
  • the object of the invention is to propose a method for rapid adjustment of the depth of the liquid well, making it possible to reduce the force undergone by the pinch rollers to its nominal value as soon as an abnormal increase in this force is observed.
  • This variable magnetic field can be mobile and therefore exert a stirring action on the liquid core of the cast product, stirring which, as is known, promotes the evacuation of heat, or on the contrary be stationary and exert an inductive heating action on the cast product.
  • the invention also relates to a continuous casting device for implementing this process, characterized in that it comprises means for measuring the spacing force exerted by the product poured on the pinch rollers, at least one inductor generating a variable magnetic field in the product poured upstream of the pinch rollers or between them, and means d slaving of said magnetic field to the value of the spreading force exerted by the product on the pinch rollers.
  • the inductor (s) can be located between the ingot mold and the pinch rollers, or housed in the pinch rollers, as described for example in Luxembourg patent n ° 67,753 filed on 07.06.1973 and the content of which is incorporated by reference herein description.
  • These inductors can impart stirring movements to the liquid core of the cast product, or exert a heating action on the cast product.
  • an increase in the stirring action of the liquid core therefore tends to accelerate the solidification of the product and to raise the closing point of the liquid well. Conversely, a decrease in the stirring action tends to delay the solidification of the product and bring down the closing point of the liquid well.
  • the intensity of the stirring is modulated as a function of the measurement of the force exerted by the product on the pinch rollers, the spacing of which, in normal operation, is kept constant and equal to the thickness desired for the product.
  • the pinch rollers are designed to undergo a force, the value of which, which is measured by sensors continuously or at close time intervals, corresponds to the closing of the liquid well. If F becomes greater than its normal value, it is the indication that the pinch rollers undergo an effort on the part of a product whose core is no longer in the liquid state. Such a deviation from normal operation of the machine may be due to factors such as a voluntary reduction or not in the casting speed, a drop in the temperature of the liquid metal feeding the ingot mold, etc.
  • the start and the end of the casting during which the temperature of the liquid metal and the speed of movement of the product can vary in significant proportions, also constitute critical periods. Indeed, it is then difficult to adjust the operating parameters of the machine so as to permanently locate the closing point of the liquid well at the desirable level.
  • the possibility to influence the speed of solidification of the metal by means of the intensity of stirring of the liquid core provides the operator with an additional means of action for controlling the operation of the machine.
  • the operator gradually decreases the intensity of the electromagnetic stirring so as to reduce the movements of the metal to slow down its solidification.
  • the force exerted on the rollers is measured. If it remains greater than F1, a further decrease in the intensity of the mixing is carried out. If it is between Fo and F1, the new intensity of stirring is maintained until, possibly, a return to normal of the pouring conditions makes this stirring intensity insufficient and moves the closing point of the liquid well below princely rolls. Such a displacement must result in an effort less than Fo, and it is then necessary to increase the intensity of stirring to bring the effort into the interval [Fo, F1].
  • a threshold value F2 greater than F1 beyond which it is considered that the force tending to spread the pinch rollers must imperatively not be supported for more than a few moments.
  • the crossing of this threshold F2 must then lead not only to a significant and abrupt reduction in the intensity of stirring, but also to a separation of the rollers in stages.
  • the force supported by the rollers is measured. If it remains greater than F2, the spacing of the rollers is increased. When it becomes less than F2, the rollers are then brought together. Then, if the force becomes greater than F2, the rollers are again moved aside.
  • warning value F3 less than F1 such that, when increasing, the spreading force reaches F3, the modification of the action of the magnetic field.
  • F4 a warning value greater than Fo such that, when decreasing, the spreading force reaches F4, the magnetic field is modified. This further limits the risk of defects in the product, which would be due to too late closing of the liquid well.
  • the organs which control the intensity of the stirring and the spacing of the pinch rollers are controlled by the operator or the data processing unit which manages the operation of the casting machine, according to the information provided by the necessary measuring instruments: measurements of the force on the rollers, the distance between the rollers, the electrical parameters of the electromagnetic stirrers, the casting speed, etc.
  • the electromagnetic stirrers with a sliding field can belong to the various known types of stirrers, imparting vertical translational movements to the metal or perpendicular to the direction of extraction, according to the large faces of the product or rotational movements.
  • they are of the type known as "brewing rollers", described for example in patent FR 2 187 468 in the name of the applicant. They are then included in rollers which also serve to support the product (without compressing it) between the lower part of the mold and the pinch rollers.
  • Plan brewers arranged opposite the large sides of the product in this same area of the machine can also be used.
  • the single appended figure shows schematically an example of installation for continuous casting of thin slabs according to the invention, seen in section and in profile.
  • the poured product 1 leaves the ingot mold 2, supplied with liquid metal by the nozzle 3, in the partially solidified state: the core 4 is in the liquid state, and it is enclosed by a peripheral layer 5 in the pasty state or fully solidified, the thickness of which increases as the product progresses through the machine, solidifying.
  • the installation includes a pair of pinch rollers 6, 6 ′ in free rotation or controlled in the direction indicated by the arrows, placed at a certain distance from the mold, outside of its immediate vicinity.
  • rollers reduce the thickness of the product to the desired value by bringing together the layers of metal which have started to solidify on the large faces of the mold, so as to close the liquid well. They are provided with means 7.7 ′ for adjusting their spacing, and for maintaining it at a determined value.
  • the installation also comprises means of electromagnetic stirring of the liquid core 4. They can be constituted, as shown in the figure, by a pair of polyphase planar stirrers 8, 8 ′ arranged opposite the large faces of the product, between the bottom of the ingot mold and the pinch rollers and generating a sliding magnetic field. Sensors measure the rolling forces F and F ′ exerted by the product respectively on the pinch rollers 6 and 6 ′, and transmit the results of these measurements to an information processing unit 9.
  • This unit controls, according to the information transmitted by the sensors, the operating parameters of the brewers which determine the intensity of the movements inside the liquid core, and this permanently. On the other hand, this unit also controls the spacing of the pinch rollers in cases where the rolling force exerted on one of them by the product exceeds the threshold F2 previously defined.
  • brewers located between the bottom of the mold and the pinch rollers
  • these Brewers in an ingot mold may be insufficient to ensure alone a sufficiently sudden variation in the speed of solidification of the liquid core.
  • Another variant consists in housing the inductors in the pinch rollers themselves, made tubular for this purpose. They are then particularly well suited to an acceleration of solidification in the case where the liquid well closes below the pinch rollers. They can also stir the liquid metal only in the latter case, or be permanently active like the devices described above. They can be used alone or in combination with other agitation devices for the liquid heart.
  • variable but stationary field inductors the role of which is to provide a permanent or intermittent flow of heat to the liquid heart.
  • This heat flow can be modulated so as to keep the liquid well closed at the pinch rollers. It is increased when the liquid well closes upstream of the nip rollers, and decreased when the liquid well closes below the nip rollers.
  • Such a device is particularly advantageous to implant inside the pinch rollers, since it can then act in the same area where its effect must be felt as a priority.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Led Devices (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP90470007A 1989-04-06 1990-03-16 Procédé et dispositif d'obtention de produits métalliques minces par coulée continue Expired - Lifetime EP0391822B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8904862 1989-04-06
FR8904862A FR2645462B1 (fr) 1989-04-06 1989-04-06 Procede et dispositif d'obtention de produits metalliques minces par coulee continue

Publications (2)

Publication Number Publication Date
EP0391822A1 EP0391822A1 (fr) 1990-10-10
EP0391822B1 true EP0391822B1 (fr) 1992-09-02

Family

ID=9380660

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90470007A Expired - Lifetime EP0391822B1 (fr) 1989-04-06 1990-03-16 Procédé et dispositif d'obtention de produits métalliques minces par coulée continue

Country Status (16)

Country Link
US (1) US5027884A (hu)
EP (1) EP0391822B1 (hu)
JP (1) JPH02295659A (hu)
KR (1) KR900015838A (hu)
AT (1) ATE80072T1 (hu)
CA (1) CA2013853A1 (hu)
CS (1) CS163790A2 (hu)
DD (1) DD293284A5 (hu)
DE (1) DE69000282T2 (hu)
DK (1) DK0391822T3 (hu)
ES (1) ES2035737T3 (hu)
FR (1) FR2645462B1 (hu)
GR (1) GR3006443T3 (hu)
HU (1) HU208267B (hu)
PL (1) PL284678A1 (hu)
RU (1) RU1795927C (hu)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5518064A (en) * 1993-10-07 1996-05-21 Norandal, Usa Thin gauge roll casting method
CN108856662B (zh) * 2018-06-21 2020-12-01 中国科学院宁波材料技术与工程研究所 一种制备Fe基纳米晶合金带材的方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1583608A1 (de) * 1967-09-09 1970-08-20 Demag Ag Stranggiessvorrichtung fuer Metalle,insbesondere Stahl
US3882923A (en) * 1972-06-08 1975-05-13 Siderurgie Fse Inst Rech Apparatus for magnetic stirring of continuous castings
FR2352611A1 (fr) * 1976-05-28 1977-12-23 Siderurgie Fse Inst Rech Procede et dispositif de detection de puits liquide dans les produits metalliques coules en continu
JPS59159934A (ja) * 1983-03-02 1984-09-10 Kawasaki Steel Corp 方向性けい素鋼板製造用素材の連続鋳造法
JPS60148651A (ja) * 1984-01-13 1985-08-05 Kawasaki Steel Corp 連続鋳造機
JPS60238001A (ja) * 1984-05-09 1985-11-26 Ishikawajima Harima Heavy Ind Co Ltd 薄板連続製造方法
JPS61132247A (ja) * 1984-11-30 1986-06-19 Kawasaki Steel Corp 連続鋳造方法
JPS62263854A (ja) * 1986-05-12 1987-11-16 Kawasaki Steel Corp 連鋳鋳片終端からの溶鋼吹出防止方法

Also Published As

Publication number Publication date
CA2013853A1 (fr) 1990-10-06
ATE80072T1 (de) 1992-09-15
US5027884A (en) 1991-07-02
HU902045D0 (en) 1990-08-28
DK0391822T3 (da) 1992-12-21
FR2645462A1 (fr) 1990-10-12
EP0391822A1 (fr) 1990-10-10
HU208267B (en) 1993-09-28
CS163790A2 (en) 1991-10-15
JPH02295659A (ja) 1990-12-06
DE69000282D1 (de) 1992-10-08
KR900015838A (ko) 1990-11-10
ES2035737T3 (es) 1993-04-16
GR3006443T3 (hu) 1993-06-21
FR2645462B1 (fr) 1991-05-31
PL284678A1 (en) 1991-08-26
DD293284A5 (de) 1991-08-29
RU1795927C (ru) 1993-02-15
DE69000282T2 (de) 1993-02-11
HUT57100A (en) 1991-11-28

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