EP0572795B1 - Ringförmige Seitendammanordnung für Doppelrollen-Stranggiessvorrichtung und Verfahren zur Kontrolle der Temperatur der Seitendämme - Google Patents

Ringförmige Seitendammanordnung für Doppelrollen-Stranggiessvorrichtung und Verfahren zur Kontrolle der Temperatur der Seitendämme Download PDF

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Publication number
EP0572795B1
EP0572795B1 EP93106715A EP93106715A EP0572795B1 EP 0572795 B1 EP0572795 B1 EP 0572795B1 EP 93106715 A EP93106715 A EP 93106715A EP 93106715 A EP93106715 A EP 93106715A EP 0572795 B1 EP0572795 B1 EP 0572795B1
Authority
EP
European Patent Office
Prior art keywords
rings
rolls
containment
temperature
molten metal
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
EP93106715A
Other languages
English (en)
French (fr)
Other versions
EP0572795A1 (de
Inventor
Leandro Nannini
Andrea Carboni
Pierluigi Inzaghi
Alfredo Lavazza
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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Publication date
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Publication of EP0572795A1 publication Critical patent/EP0572795A1/de
Application granted granted Critical
Publication of EP0572795B1 publication Critical patent/EP0572795B1/de
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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
    • B22D11/0671—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for heating or drying
    • 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
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/066—Side dams

Definitions

  • This invention concerns a lateral containment device with rings for continuous casting plants with rolls and a method to control the temperature of the containment rings of this device, as set forth in the respective preamble of claims 1 and 5.
  • the invention concerns a cooling and/or heating system cooperating with the lateral containment device with rings so as to provide a suitable required temperature of the sidewalls of the containment rings.
  • the containment rings can slide along the axis of the rolls and thus enable the width of the cast strip to be adjusted continuously.
  • the rolls are provided with suitable cooling means consisting of cooling water circulating within the rolls, for instance.
  • This cooling water causes a thermal flow in a direction perpendicular to the surface of the rolls, thus leading to solidification of the strip being formed.
  • the two half-strips thus created on the surface of each roll are drawn during rotation of the rolls and are connected together in the vicinity of the line connecting the axes of the rolls.
  • the point of meeting of the two half-strips is called in the art the "kissing point".
  • the two half-strips are lightly rolled to unite them to each other.
  • the overall solidified thickness at the kissing point should be slightly greater than the gap existing between the two rolls.
  • the rolling force is generally measured by load cells fitted to the supports of at least one of the two rolls.
  • This solid skin is drawn together with the half-strips and is rolled by the rolls; as it is thin and cannot withstand combined bending and compressive stresses, it normally tends to be folded back inwards.
  • FR-A-2.628.993 discloses a heated closure plate which is intended to keep hot an upper zone where a casting chamber is located. This plate exerts a high pressure against the edge of both the rolls but does not prevent formation of a thin solidified skin near the rolls, thus disclosing again what we have already said but in a less prominent form.
  • the purpose of the invention is to provide a containment device with rings for continuous casting plants with rolls, whereby the temperature of the sidewalls of the containment rings in contact with the molten metal is suitably controlled and adjusted.
  • a further purpose of the invention is to provide the relative method to control the temperature.
  • the adjustment is prearranged in such a way as to prevent excessive heat exchange between those sidewalls and the metal being cast, and viceversa, since the heat exchange, if it is too great and is directed towards those sidewalls, will lead to the shortcomings described above.
  • the device and the method according to the invention therefore, purpose to keep the sidewalls of the rings always at a required controlled temperature during the processing steps and in any casting conditions.
  • the present inventors have found to their surprise that, if the ring is kept at the desired temperature, the results in the finished product are very good.
  • the ring When the maximum temperature compatible with the task performed by the ring and with the type of material composing the ring is reached, the ring has to be cooled to avoid too great overheating.
  • the rings are therefore equipped with a cooling system that lowers the temperature of their sidewalls and prevents overheating.
  • This cooling system may consist, for instance, of circulation of water fed along the axes of the rolls.
  • the temperature of the wall of the ring in contact with the molten metal may be too low.
  • the present inventors have found to their surprise that it is advantageous to provide a heating system suitable to raise, and to help in keeping, the temperature of the ring at the desired level in the initial phase.
  • This heating system may be brought about, for instance, by introducing a plurality of electrical heating resistors into the ring. These electrical resistors may be fed, for instance, by means of circumferential brush contacts arranged on the outer wall of the ring; the electrical conductors connecting the electrical resistors are connected to the brush contacts.
  • the brush contacts may be connected directly to the network of the electricity supply.
  • the brush contacts arranged on the ring are connected through conductors to analogous circumferential brush contacts arranged on the neck of at least one of the rolls.
  • At least one protective element is included to protect the electrical contacts and conductors.
  • the reference number 10 in the figures indicates a generic continuous casting plant as shown in the diagrammatic plan view of Fig.1.
  • the plant 10 consists of two facing, contrarotating rolls 11a and 11b, between which molten metal 12 is cast to produce a thin strip 13 at the outlet of the plant.
  • Two lateral containment rings 14a and 14b which can rotate together with the rolls 11a-11b are keyed at the ends of the rolls 11a-11b. These containment rings 14a-14b can move along the axes of the rolls 11a-11b so as to adjust the width of the emerging strip 13 continuously as required (see Figs.1a and 1b).
  • the rolls 11a and 11b are provided with cooling means to obtain solidification of the cast metal 12.
  • the rolls 11a-11b include within them a circulation of cooling water 15, which creates a thermal flow in a direction perpendicular to the axes of the rolls 11.
  • This thermal flow causes solidification of the strip 13 or, to be more exact, causes the formation of two half-strips 16a and 16b respectively on the surfaces of the two rolls 11a and 11b.
  • the two half-strips 16a-16b are rolled so as to bond them together at the kissing point 17.
  • the required rolling force is measured by load cells 28 fitted to the supports of one of the rolls 11.
  • This solid skin 12a tends to become folded inwards (Fig.3b) and creates a solidified excessive thickness at the edges of the strip 13, thus often causing a failure of the half-strips 16a-16b to be bonded together in their central zone, as can be seen in Fig.3c.
  • the invention provides for the inclusion of an annular circuit 23 for circulation of cooling water within the containment rings 14a-14b.
  • cooling water is fed along the axes of the rolls 11 through an inlet conduit 18a and is discharged through an outlet conduit 18b (Fig.5a).
  • the annular circuit 23 includes baffle elements 26 to guide the water which cooperate with the inlet and outlet conduits 18a and 18b respectively.
  • the invention includes the provision of a heating system, which in this example (Figs.5) consists of electrical heating resistors 19 arranged radially in the rings 14.
  • Embodiments are possible, but are not shown here, which include electrical resistors 19 arranged in a spiral along the periphery of the rings 14 or else include metallic radiant disks which are coaxial and concentric with the rings 14.
  • Electric current is fed to the electrical resistors 19, in this case, through brush contacts 22 fitted to the outer surface of the ring 14a and connected to the resistors 19 by connecting conductors 24.
  • the brush contacts 22 in this case are circumferential and are fitted to a drum 20 connected electrically to the neck 21 of the roll 11, the neck 21 being equipped likewise with circumferential brush contacts 22 connected electrically to the supply network 27.
  • the device according to the invention comprises one or more screening elements 25, secured in this example to the periphery of the ring 14a, so as to ensure protection of the brush contacts 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)

Claims (7)

  1. Seitliche Einschließvorrichtung mit Ringen für Stranggußanlagen mit Walzen, wobei die Walzen (11) im wesentlichen koplanar und parallel sind, die Vorrichtung eine automatische Einrichtung zum Einstellen des Abstandes zwischen den Mitteilpunkten der Walzen und des Walzendrucks umfaßt, wobei jede Walze (11) mit einem Einschließring (14) zusammenwirkt, die Ringe (14) auf ein Ende der anderen Walze (11) wirken und die Breite eines Streifens (13) bestimmen, der stranggegossen wird, die Walzen (11) und die Ringe (14) eine ringförmige Kreislaufeinrichtung (20) zum Kühlen durch Zirkulation Von Kühlfluid enthalten, die Ringe (14) Heizeinrichungen (19) enthalten, die mit der Wand zusammenwirken, die mit dem geschmolzenen Metall (12) in Kontakt ist, wobei die Vorrichtung dadurch gekennzeichnet ist, daß sie eine Einrichtung zum koordinierten Regulieren der Abgabe des Kühlwassers in der Kühleinrichtung und der Intensität des elektrischen Stroms der Heizeinrichtung (19) enthält, wobei die Regulierung von der erforderlichen und gesteuerten Temperatur der Wände der Einschließringe (14a,14b) abhängt, die in Kontakt mit dem geschmolzenen Metall (12) sind.
  2. Vorrichtung nach Anspruch 1, wobei die Heizeinrichtungen aus elektrischen Widerständen (19) bestehen, die mit gesteuerter Spannung gespeist werden.
  3. Vorrichtung nach Anspruch 1 oder 2, wobei die Ringe (14) entlang der Länge ihrer entsprechenden Walze (11) positioniert werden können.
  4. Vorrichtung nach einem der vorangehenden Ansprüche, wobei die Walzen (11) entlang ihrer eigenen Achse positioniert werden können.
  5. Verfahren zum Steuern der Temperatur der seitlichen Einschließringe einer seitlichen Einschließvorrichtung mit Ringen für Stranggußanlagen mit Walzen nach einem der vorangehenden Ansprüche, wobei das Verfahren dadurch gekennzeichnet ist, daß es die Temperatur der Seitenwand der Ringe (14), die mit dem geschmolzenen Metall (12) in Kontakt ist, durch koordinierte Regulierung der Abgabe von Wasser, das in der ringförmigen Kreislauf-Kühleinrichtung (23) strömt, die in die Ringe (14) integriert ist, und mittels der Intensität des elektrischen Stroms, der die Heizeinrichtungen (19) speist, die zu den Ringen (14) gehören, steuert und reguliert.
  6. Verfahren nach Anspruch 5, wobei zum Beginn des Gießprozesses die Temperatur der Seitenwand der Ringe (14), die mit dem geschmolzenen Material (12) in Kontakt ist, durch gesteuerte Aktivierung der elektrischen Widerstände (19) erhöht wird.
  7. Verfahren nach Anspruch 5 oder 6, wobei während des normalen Betriebs der Stranggußanlage die Temperatur der Seitenwand der Ringe (14) in Kontakt mit dem geschmolzenen Metall (12) durch gesteuerte Regulierung der Abgabe des Wassers, das in der ringförmigen Kreislauf-Kühleinrichtung (23) zirkuliert, die in die Ringe (14) integriert ist, gesenkt wird.
EP93106715A 1992-05-27 1993-04-26 Ringförmige Seitendammanordnung für Doppelrollen-Stranggiessvorrichtung und Verfahren zur Kontrolle der Temperatur der Seitendämme Expired - Lifetime EP0572795B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD920100A IT1259778B (it) 1992-05-27 1992-05-27 Dispositivo di contenimento laterale ad anelli per impianti di colata continua a rulli
ITUD920100 1992-05-27

Publications (2)

Publication Number Publication Date
EP0572795A1 EP0572795A1 (de) 1993-12-08
EP0572795B1 true EP0572795B1 (de) 1998-12-23

Family

ID=11421112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93106715A Expired - Lifetime EP0572795B1 (de) 1992-05-27 1993-04-26 Ringförmige Seitendammanordnung für Doppelrollen-Stranggiessvorrichtung und Verfahren zur Kontrolle der Temperatur der Seitendämme

Country Status (5)

Country Link
EP (1) EP0572795B1 (de)
AT (1) ATE174825T1 (de)
DE (1) DE69322689T2 (de)
ES (1) ES2127228T3 (de)
IT (1) IT1259778B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2524962B (en) * 2014-04-07 2016-12-07 Cambridge Entpr Ltd Strip casting
CN114918393B (zh) * 2022-06-09 2024-07-19 吉林建龙钢铁有限责任公司 一种控制中、低碳钢结晶器液位周期性波动的方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2058447A (en) * 1932-05-16 1936-10-27 Clarence W Hazelett Metalworking process
EP0138059A1 (de) * 1983-09-19 1985-04-24 Hitachi, Ltd. Verfahren und Vorrichtung zum Giessen eines Metallbandes zwischen zwei Walzen
FR2628993B3 (fr) * 1988-03-25 1990-01-26 Siderurgie Fse Inst Rech Dispositif d'obturation laterale de l'espace de coulee d'une lingotiere de coulee continue entre cylindres

Also Published As

Publication number Publication date
DE69322689D1 (de) 1999-02-04
ITUD920100A0 (it) 1992-05-27
EP0572795A1 (de) 1993-12-08
DE69322689T2 (de) 1999-04-29
ATE174825T1 (de) 1999-01-15
ITUD920100A1 (it) 1993-11-27
IT1259778B (it) 1996-03-26
ES2127228T3 (es) 1999-04-16

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