EP0165456B1 - Verfahren und Vorrichtung zur Herstellung dünner Stahlbrammen - Google Patents

Verfahren und Vorrichtung zur Herstellung dünner Stahlbrammen Download PDF

Info

Publication number
EP0165456B1
EP0165456B1 EP19850105852 EP85105852A EP0165456B1 EP 0165456 B1 EP0165456 B1 EP 0165456B1 EP 19850105852 EP19850105852 EP 19850105852 EP 85105852 A EP85105852 A EP 85105852A EP 0165456 B1 EP0165456 B1 EP 0165456B1
Authority
EP
European Patent Office
Prior art keywords
chilled
chilled surface
slab
pool
embryo
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
Application number
EP19850105852
Other languages
English (en)
French (fr)
Other versions
EP0165456A3 (en
EP0165456A2 (de
Inventor
Irving Rossi
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0165456A2 publication Critical patent/EP0165456A2/de
Publication of EP0165456A3 publication Critical patent/EP0165456A3/en
Application granted granted Critical
Publication of EP0165456B1 publication Critical patent/EP0165456B1/de
Expired legal-status Critical Current

Links

Images

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
    • B22D11/14—Plants for continuous casting
    • B22D11/145—Plants for continuous casting for upward casting

Definitions

  • the first, and historically the earliest group, may be referred to as the vertical group in which the molten metal to be cast is poured continuously into the open upper end of a substantially vertically disposed mold passage of a chilled mold in which a continuous strand consisting of a solidified shell surrounding a molten core is formed as heat is withdrawn through the chilled walls of the mold passage.
  • the embryo cast strand so formed is withdrawn downwardly continuously from the open lower end of the mold passage where it enters a secondary cooling zone in which it is subjected to further cooling and solidification by direct application of cooling fluid to the solidified surface.
  • the US Patents Nos. 2,135,183 and 2,135,184 of Junghans are representative of the earliest commercially successful continuous casting processes of this group.
  • the second group may be referred to as the horizontal group because the mold passage through the chilled mold is substantially horizontally disposed.
  • the theoretical advantages of the horizontally disposed mold passage have been outweighed by practical difficulties which have been encountered in their use, particularly in feeding the molten metal into the mold passage. Machines and processes of this group have found very little commercial use.
  • a device for the continuous casting of thin walled ingots, there has recently been described a device, as laid out in the preamble of claim 6, comprising a reservoir containing a pool of molten metal, a mold having a mold wall having a transversely flat chilled surface which is curved longitudinally, and heat resistant means extending along the side edges of said chilled surface and projecting upwardly above said reservoir, and means for withdrawing the embryo cast slab continuously along said chilled surface (JP-A-57-202947; patent abstract of Japan, Vol. 7, No. 55 (M-198) (1200)), upon which the preambles of claims 1 and 6 are based.
  • the cooled bottom part of the mold is formed to a transversely flat curved hollow shape, and the mold is oscillated back and forth along the curving direction by an oscillating device, while the formed ingot is withdrawn in a horizontal direction by drawing rolls.
  • the invention is especially adapted to the manufacture of relatively thin steel slabs of 12 to 25 mm (one-half to one inch) in thickness, and will be described more particularly hereinafter as applied thereto.
  • I also propose to provide means resistant to heat transfer extending at least along the side edges of the submerged portion of the chilled surface and forming vertical walls projecting above said surface to restrict heat trasnfer from the strand except through said chilled surface.
  • the first portion of said chilled surface i.e., the submerged portion thereof, be curved convexly, longitudinally to form a short arc of a circle, and that the lower end of the arc be located substantially perpendicularly to the horizontal surface of the molten metal pool so that the embryo cast strand will move along the submerged portion of the chilled surface in a substantially vertical direction while it is accumulating metal from the pool and until it emerges from the pool.
  • the second portion of said chilled surface be curved convexly to form an arc of a circle of the same radius as that of the submerged arc so that as the embryo strand moves from the submerged portion onto and along the second portion it is not subjected to bending or other stresses as it proceeds along said surfaces and during the time when the crystal structure of the strand is being formed and solidified by withdrawal of heat through said chilled surfaces.
  • I also propose to cause the solidified strand to move directly from the chilled surface to pass between forming rollers while it retains sufficient residual heat to be easily deformable without need to reheat the strand, thus making possible considerable saving in the cost of the product.
  • the curved chilled mold surfaces may extend through a total circular arc of between 45° and 75° so that the strand may leave the second portion of the chilled surface moving toward withdrawal rolls and a work station such as a rolling mill, for example.
  • the quantity of heat withdrawn from the strand is controlled to permit the strand to retain sufficient residual heat to be reshaped by rolling without reheating.
  • the pool of molten metal to be cast may be stored in a suitable tundish or reservoir 1 of refractory material to which molten metal may be supplied in any suitable manner as through a spout 2.
  • the flow of metal to the reservoir may be controlled in any suitable manner; i.e., either manually or automatically by known means responsive to the level of molten metal in the reservoir; i.e., to increase the flow of metal into the reservoir when the level tends to fall below a predetermined level, or to decrease the flow of metal when the level rises above the predetermined level.
  • a water cooled mold 3 having a transversely flat thermally conductive wall 4, preferably of copper, forming a flat chilled mold surface having a lower portion 5 that extends to the bottom of said reservoir and submerged in the molten metal therein.
  • the molten metal mold is exposed to the chilled surface 5 so that heat may be withdrawn through said surface to cause an embryo cast strand 6 to begin to be formed thereon.
  • they are preferably made of materials which are resistant to heat transfer, such as refractory materials, for example. Since the surfaces of the submerged portions of the strips 26 are exposed to the molten metal in the pool and will be heated thereby, there will be little or no tendency for heat transfer through them from the strand, but if desired, electrical heating elements may be embedded in the strips, particularly those located above the surface of the pool.
  • said strips may be made of metal, such as steel, for example, in which case the strips, even though submerged, may have heating elements embedded therein to maintain the strips at a temperature sufficient to prevent heat transfer laterally from the strand.
  • the embryo casts strand will be completely formed when it reaches the level of the metal in the pool. That is, no metal will be added to the strand above the pool level, although previously adhered metal in liquid or partially solidified state will be solidified subsequently by additional heat transfer as it moves along the second portion of the chilled surface above the pool level.
  • the strips 26 may be extended along the side edges of the mold wall as far as desired, although, since complete solidification of the strand may occur within a reasonably short distance beyond the pool level, the strips may not be needed along the entire length of the mold wall.
  • the mold wall 4 although flat transversely, is curved longitudinally to form a circular arc of from 45° to 75°.
  • the lower portion of the chilled surface designated by 5 forms only a short portion of the entire chilled surface of the mold and the lower end of the arc is located substantially perpendicularly to the bottom of the reservoir and to the surface of the molten metal pool. It extends only through an arc of 10° to 20° so that the embryo strand will move along the submerged chilled surface in substantially vertical direction while it is accumulating metal from the pool. Since the two convexly curved surfaces 5 and 7 are formed on the same radius, the embryo cast strand retains its contour as it moves along both portions and is not subjected to bending or other stresses as its crystal structure is being formed and solidified. Bending of the strand is required only as it reaches the withdrawal rolls 9, by which time solidification of the strand will have been completed.
  • the surfaces of the mold wall 4 may be lubricated by methods known in the art.
  • the mold 3 may be supported in any suitable manner.
  • the portion of the strand 8 between the surface 7 and the withdrawal rolls 9 may be supported by one or more rollers such as roller 10.
  • a plurality of chains 11 may be arranged to extend down along the chilled surfaces 7 and 5 to the bottom of the reservoir 1 to be imbedded in the first of the solidified metal which forms on the surface 5.
  • the other ends of the chains 11 may be extended upwardly over the surface 7 to the withdrawal rolls 9.
  • the level of the molten metal in the reservoir 1 is relatively low indicated in Fig. 2.
  • the withdrawal rolls 9 may be activated to begin the withdrawal of the starter bar.
  • the level of molten metal mold is allowed to rise as indicated in Fig. 1 and the embryo cast strand 6 continues to be formed by withdrawal of heat through the surface 5.
  • the thickness of the cast strand may be determined by adjustment of either or both of two factors: (1) the depth of the molten metal in the pool and (2) the rate of withdrawal of the cast strand. The slower the rate of withdrawal, the greater the thickness of the cast strand. Likewise, the greater the depth of the molten metal in the pool, the greater the thickness of the cast strand. It will be understood that the molten metal will begin to solidify against the chilled surface 5 near the bottom thereof to form the embryo strand 6. The strand will be very thin at first but will thicken gradually as it is withdrawn upwardly along the chilled surface 5 until it reaches its maximum thickness as it emerges from the pool. Thereafter, the strand is cooled additionally as it moves along the continuation 7 of the chilled surface 5. If desired, it may be cooled still further by sprays from nozzles.
  • the strand 8 may be moved directly between pairs of rolls 14 and 15 which reduce the thickness of the strand.
  • the thickness of the strand could be reduced by rolls 14 and 15 to provide hot rolled sheet steel having a thickness of 6,4 mm (one quarter inch) or less.
  • the forming rolls 14, 15 and the withdrawal rolls 9 may be mounted together as a unit in a supporting structure (not shown) forming part of the supporting structure for the mold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Claims (9)

1. Verfahren zum kontinuierlichen Gießen dünner Stahlbrammen mit gleichmäßiger Dicke in Querrichtung, wobei ein Bad von geschmolzenem Metall einer gekühlten Fläche ausgesetzt wird, die in Querrichtung flach und in Längsrichtung gebogen ist und sich zwischen wärmebeständigen Flächen erstreckt, die längs ihrer Seitenkanten nach oben vorspringen, und wobei Wärme dem geschmolzenen Metall durch die gekühlte Fläche entzogen wird, um auf dieser eine embryonale flache Gußbramme zu bilden, und die embryonale Gußbramme kontinuierlich längs der gekühlten Fläche abgezogen wird, dadurch gekennzeichnet, daß das Bad des geschmolzenen Metalls einer feststehenden gekühlten Fläche (4,5,7) ausgesetzt wird, die in Querrichtung flach und in Längsrichtung unter Bildung eines konvexen Bogens gebogen ist und die einen ersten Abschnitt (5), der im Bad untergetaucht ist, und einen zweiten Abschnitt (7) aufweist, der sich über und jenseits der Oberfläche des Bades als Fortsetzung des ersten Abschnittes erstreckt und eine größere Länge als der erste Abschnitt hat, Wärme dem geschmolzenen Metall nur in einer Richtung durch den ersten Abschnitt (5) der gekühlten Fläche entzogen wird, während der Wärmeübergang vom geschmolzenen Metall längs der Seitenkanten der gekühlten Fläche begrenzt wird, um auf dieser eine embryonale flache Gußbramme (6) mit gleichmäßiger Dicke über ihre Breite zu bilden, und die embryonale Gußbramme (6) kontinuierlich längs der gekühlten Fläche (5, 7) unter Begrenzung des Wärmeübergangs von der embryonalen flachen Gußbramme längs deren Seitenkanten mit einer solchen Geschwindigkeit abgezogen wird, daß genügend Wärme durch die gekühlte Fläche entzogen werden kann, um auf dieser die Bildung einer flachen Bramme (8) der gewünschten Dicke zu bewirken.
2. Verfahren nach Anspruch 1, wobei sich der untergetauchte Abschnitt (5) der gekühlten Fläche im wesentlichen im rechten Winkel zur horizontalen Oberfläche des Bades erstreckt und die Gußbramme (6) sich im wesentlichen vertikal bewegt, während sie abgezogen wird.
3. Verfahren nach einem der Ansprüche 1 oder 2, wobei die Dicke der Bramme (8) durch Regelung der Geschwindigkeit des Abziehens der Bramme bestimmt wird.
4. Verfahren nach wenigstens einem der Ansprüche 1 bis 3, wobei die Dicke der Bramme (8) durch Regelung der Tiefe des geschmolzenen Metalls im Bad bestimmt wird.
5. Verfahren nach wenigstens einem der Ansprüche 1 bis 4, wobei die Gesamtmenge der der Bramme (8) entzogenen Wärme so geregelt wird, daß die Bramme (8) genügend warm bleibt, so daß sie, nachdem sie die Flächen (5, 7) verläßt, ohne erneutes Erhitzen umgeformt werden kann.
6. Vorrichtung zum kontinuierlichen Gießen von Metallbrammen mit gleichmäßiger Dicke in Querrichtung mit einem Behälter (1), der ein Bad von geschmolzenem Metall enthält, einer Form mit einer Formwand (4), die eine in Querrichtung flache gekühlte Fläche hat, die in Längsrichtung gebogen ist, und mit wärmebeständigen Einrichtungen (26), die sich längs der Seitenkanten der gekühlten Fläche erstrecken und nach oben über den Behälter vorspringen, und mit Vorrichtungen (9) zum kontinuierlichen Abziehen der embryonalen Gußbramme längs der gekühlten Fläche, dadurch gekennzeichnet, daß die gekühlte Fläche eine feststehenden in Querrichtung flache gekühlte Fläche (5, 7) ist, die in Längsrichtung unter Bldung eines konvexen Bogens gebogen ist und in dem Behälter (1) einen ersten Abschnitt hat, durch welchen Wärme dem geschmolzenen Metall in nur einer Richtung entzogen wird, um auf diesem eine embryonale Gußbramme (6) zu bilden, daß die sich längs der Seitenkanten der gekühlten Fläche erstreckenden wärmebeständigen Einrichtungen (26) wärmedämmend sind, um den Wärmeübergang von der embryonalen Gußbramme (6) außer durch die gekühlte Fläche (5) zu begrenzen, daß die gekühlte Fläche einen zweiten Abschnitt (7) hat, der eine Fortsetzung des ersten Abschnittes (5) bildet und sich oberhalb und jenseits des Behälters über eine größere Länge als die Länge des ersten Abschnittes erstreckt, und daß die Vorrichtungen zum kontinuierlichen Abziehen der embryonalen Gußbramme längs der gekühlten Fläche einen Satz von Abzugswalzen (9) aufweisen.
7. Vorrichtung nach Anspruch 6, worin sich das untere Ende der gekühlten Fläche (5) im wesentlichen vertikal erstreckt.
8. Vorrichtung nach einem der Ansprüche 6 oder 7, worin der Satz von Abzugswalzen (9) im ganzen horizontal fluchtend mit dem oberen Ende der gekühlten Fläche (7) ist und weiter ein Satz von Umformwalzen (14, 15) in im ganzen horizontaler Flucht mit dem Satz von Abzugswalzen (9) vorgesehen ist, um die Gußbramme (8) umzuformen, indem sie nach dem Verlassen der Abzugswalzen und während sie noch genügend Restwärme enthält, um ein Umformen ohne Wiedererhitzen zu gestatten, durch die Umformwalzen geführt wird.
9. Vorrichtung nach wenigstens einem der Ansprüche 6 bis 8, die außerdem eine Starterstangenvorrichtung (11, 12) zum Einführen in den Behälter (1) längs der gekühlten Formfläche (5, 7) aufweist, um eine auf der gekühlten Fläche aus geschmolzenem Metall im Bad gebildete embryonale Bramme (6) aus dem Bad längs der gekühlten Formfläche nach oben abzuziehen und die embryonale Bramme zum Abzugswalzensatz (9) zu überführen.
EP19850105852 1984-05-18 1985-05-13 Verfahren und Vorrichtung zur Herstellung dünner Stahlbrammen Expired EP0165456B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US61204884A 1984-05-18 1984-05-18
US612048 1984-05-18
US71871985A 1985-04-01 1985-04-01
US718719 1985-04-01

Publications (3)

Publication Number Publication Date
EP0165456A2 EP0165456A2 (de) 1985-12-27
EP0165456A3 EP0165456A3 (en) 1987-02-04
EP0165456B1 true EP0165456B1 (de) 1988-12-07

Family

ID=27086659

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850105852 Expired EP0165456B1 (de) 1984-05-18 1985-05-13 Verfahren und Vorrichtung zur Herstellung dünner Stahlbrammen

Country Status (4)

Country Link
EP (1) EP0165456B1 (de)
BR (1) BR8502337A (de)
CA (1) CA1239520A (de)
DE (1) DE3566628D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0387006A3 (de) * 1989-03-08 1991-08-14 Stelco Inc. Metallbandgiessvorrichtung mit zwei Seitenplatten
FI112447B (fi) * 1997-04-29 2003-12-15 Outokumpu Oy Menetelmä ja laite metallilankojen, -tankojen ja -putkien valamiseksi ylöspäin
JP6477667B2 (ja) * 2016-11-08 2019-03-06 トヨタ自動車株式会社 成形体製造方法、及び、成形体製造装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2253587B1 (de) * 1974-12-23 1978-11-03 Ural Krasnog

Also Published As

Publication number Publication date
DE3566628D1 (en) 1989-01-12
EP0165456A3 (en) 1987-02-04
EP0165456A2 (de) 1985-12-27
CA1239520A (en) 1988-07-26
BR8502337A (pt) 1986-01-21

Similar Documents

Publication Publication Date Title
US5630467A (en) Thin slab continuous casting machine and method
US4635702A (en) Mold for continuous casting of steel strip
RU2453393C2 (ru) Способ и установка для изготовления металлической полосы
ES2280727T3 (es) Procedimiento para la laminacion continua de una barra metalica, en especial una barra de acero, medida en la seccion transversal como un desbaste delgado y producida a una velocidad de colada, y la maquina de colada continua correspondiente.
CA1239520A (en) Thin steel slabs
EP0909597A1 (de) Kokille zum Stanggiessen von dünnen Brammen
US4709745A (en) Process and apparatus for making thin steel slabs
US3837391A (en) Continuous casting apparatus
CA1054370A (en) Method and apparatus for manufacture of flat glass by the float process
EP0127319B1 (de) Stranggusseinrichtung zur Herstellung gegossener Bänder
FI78250C (fi) Foerfarande och anordning foer direktgjutning av smaelt metall.
EP0174767B1 (de) Verfahren und Einrichtung für das direkte Giessen von kristallinen Bändern durch Strahlungskühlung
US3746070A (en) Method for improving continuously cast strands
US4830087A (en) Continuous casting of thin slab ingots
EP0174766B1 (de) Verfahren und Einrichtung für das direkte Giessen von kristallinen Bändern in nicht-oxydierender Atmosphäre
US3435879A (en) Continuous casting method
JPH0333424B2 (de)
JPH0616920B2 (ja) ビ−ムブランク連続鋳造方法
WO1995013149A1 (en) Slab caster and inline strip and plate apparatus
US4022369A (en) Curved roller track for continuously cast ingots
US3916985A (en) Apparatus for continuous casting of metal strips
CA2217618A1 (en) Method to shear slabs arriving from a continuous casting plant and relative device
JPS6123556A (ja) 薄い鋼鋳片の製造方法および装置
SU952775A1 (ru) Устройство дл изготовлени армированного стекла
US4106547A (en) Method and arrangement for removing a cooled strand from a continuous casting installation

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE FR GB IT LI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): CH DE FR GB IT LI

17P Request for examination filed

Effective date: 19870507

17Q First examination report despatched

Effective date: 19870911

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19881207

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19881207

Ref country code: FR

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19881207

Ref country code: CH

Effective date: 19881207

REF Corresponds to:

Ref document number: 3566628

Country of ref document: DE

Date of ref document: 19890112

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EN Fr: translation not filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19890513

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19900201