EP0391824A1 - Procédé et installation de coulée de produits métalliques minces à réduction d'épaisseur sous la lingotière - Google Patents

Procédé et installation de coulée de produits métalliques minces à réduction d'épaisseur sous la lingotière Download PDF

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Publication number
EP0391824A1
EP0391824A1 EP90470009A EP90470009A EP0391824A1 EP 0391824 A1 EP0391824 A1 EP 0391824A1 EP 90470009 A EP90470009 A EP 90470009A EP 90470009 A EP90470009 A EP 90470009A EP 0391824 A1 EP0391824 A1 EP 0391824A1
Authority
EP
European Patent Office
Prior art keywords
product
thickness
mold
thickness reduction
cylinders
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.)
Ceased
Application number
EP90470009A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Marc Jolivet
Bernard Robert
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 EP0391824A1 publication Critical patent/EP0391824A1/fr
Ceased 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • 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

Definitions

  • the present invention relates to a process for casting thin metallic products, in particular steel, such as thin slabs according to which the molten metal is poured into an ingot mold of elongated section and the thickness of the product coming from the ingot mold is reduced directly to the output thereof while the core of said product is not yet solidified
  • It also relates to a casting installation, allowing the implementation of this process, comprising a mold with cooled fixed walls and a device located directly downstream of the mold, intended to reduce the thickness of the cast product to bring it to the 'final thickness desired for the thin product, this device comprising two clamping members, to bring together and unify the solidified walls of the product from the ingot mold, generally constituted by cylinders acting on said product in the manner of rolling cylinders.
  • the mold has, at least in its upper part, a central flare, the large faces then having for example a section in the form of a "gendarme hat".
  • the cast product passes immediately downstream of the mold between two cylinders which bring the large faces of the product together to bring them parallel to each other.
  • the thickness of the product from the ingot mold is reduced immediately downstream of it, while the core is not yet solidified, to bring the cast product to the desired thickness.
  • the thin slabs obtained by these methods can have defects of the "long edge" type well known to laminators, and, on the other hand, the elongation of the edges can induce large faces in the solidified skins. tensile stresses such as breakthroughs can occur by rupture of these skins.
  • the rolling of the edges requires a force for tightening the thickness reduction cylinders, much greater than the force necessary to bring the solidified skins closer to the central parts of the large faces, which leads to oversizing the device ensuring the "rolling" .
  • the purpose of the present invention is to solve the problems set out above, and to allow obtaining thin products, such as thin slabs, of good quality, while limiting the dimensions and therefore the size of the installation. Manufacturing.
  • the subject of the present invention is a process for casting thin metallic products, in particular thin slabs, of the type according to which liquid metal is poured into a continuous casting mold of elongated section from which the metal partially solidified is continuously extracted and the thickness of the product from the ingot mold is reduced, by a thickness reduction device located directly downstream thereof, while the core of said product is not yet solidified.
  • this process is characterized in that the thickness is reduced only to a central zone of the product from the ingot mold, that is to say to the exclusion of the solidified edges of said product, to a value less than half the thickness of said edges, and, after said reduction in thickness, the edges of the product which have not been subjected to it are dropped.
  • the thickness reduction is carried out so as to obtain, immediately downstream of the thickness reduction device, a completely solidified product.
  • the "long edge" defects mentioned above are eliminated or at least considerably reduced.
  • there is no rolling of the solidified areas of the product Only a central zone of the product, the width of which corresponds to the width of the liquid or pasty well, is subjected to the reduction in thickness.
  • the solidified skins of the large faces of the product are in fact brought closer to one another without their elongation, the metal of the non-solidified core being somehow pushed back towards the ingot mold.
  • the solidified skins of the small faces of the product are not laminated and therefore do not undergo elongation either.
  • all the zones of the product of which the metal has solidified in an ingot mold retain their length, which avoids the appearance of differential stresses in the final product, and its deformation.
  • the invention also relates to an installation for casting thin metallic products comprising an ingot mold for continuous casting of elongated section, and a device for reducing the thickness of the product coming from the ingot mold, placed directly downstream of the latter.
  • the installation is characterized in that the thickness reduction device comprises thickness reduction means having an active width less than the width of the large faces of the mold at its lower end, and in what it includes cutting means for falling the edges of the product, located downstream of the thickness reduction means.
  • these thickness reduction means comprise at least one pair of cylinders whose active length is less than the width of the large faces of the mold at its lower end.
  • the installation according to the invention makes it possible to obtain a product practically free from skin constraints.
  • the thickness reduction cylinders, their supports and their drive means possible may be reduced in size, since the forces to which they are subjected during rolling on a liquid core are much lower than those which would be necessary to actually laminate the solidified edges of the product.
  • FIGS. 1 and 2 The installation shown in FIGS. 1 and 2 comprises a continuous casting mold 1 of elongated rectangular horizontal section, and a thickness reduction device 20 comprising a pair of cylinders 22 driven in rotation by drive means 21 and placed just below the mold, the axes of the cylinders being parallel to the large walls 11 of the mold.
  • the large walls 11 and the small walls 12 of the mold as well as the cylinders 22 are cooled in a conventional manner, for example by internal circulation of a cooling fluid.
  • the active length of the cylinders 22, that is to say the length of their generatrix, is less than the width of the large walls of the mold.
  • the liquid metal 3 is poured into the mold, where it begins to solidify on contact with the cooled walls, forming solid skins 4,4 ′.
  • the section of product 1, shown in FIG. 3 a comprises a solidified peripheral zone formed by the skins 4, 4 ′, and a non-solidified core 5.
  • the skins 4, solidified in contact with the large walls 11 of the mold are brought together one from the other, in the central zone 6 of the product from the ingot mold, by the rolling effect of the cylinders. Against by the edges 7 of the product do not pass into the grip of the cylinders and therefore retain their thickness.
  • the skins 4 ′ solidified in contact with the small walls 12 of the mold are not laminated and therefore do not undergo elongation. Similarly, the width of the product is not appreciably increased.
  • the section of the product is as shown in FIG. 3 b , having an elongated "dog bone" shape.
  • the thickness of the non-solidified core 5 is progressively reduced as the product advances, due to the approximation of the skins 4.
  • the skins 4 are joined together and form the core 6 ′ of the product, the section of which shown in FIG. 3 c , has the shape of an "I", the wings of which 7 ′, have kept a width substantially equal to that of the small faces of the mold, while the thickness of the central part of the product is substantially equal to half of this width, that is to say the thickness of the edges of the product from the mold.
  • the reduction in thickness of the central part can be considerably greater, for example this thickness can be reduced to only one fifth of the thickness of the edges.
  • the bottom of the solidification well is maintained at the level of the plane of the axes of the cylinders 22, which ensures good connection of the two skins 4, this being done in the pasty zone from the bottom of the well.
  • it must be ensured that the thickness of the solidified skins below the level of the axes of the cylinders is sufficient to prevent them from deforming and swelling of the product. Additional cooling can in particular be provided for this purpose to accelerate the solidification of the product.
  • the installation also comprises means 8 for falling the wings 7 ′ of the solidified product obtained after passage between the cylinders 22, such as a shear or any suitable cutting means.
  • the thin slab 9 obtained has a rectangular section (FIG. 3d), the thick of which seur is equal to the spacing of the cylinders, and the width determined by the wing drop operation.
  • the cylinders are driven in rotation by drive means 21. It is then these cylinders which constitute the means for extracting the product from the ingot mold.
  • the extraction can also be carried out by specific extraction means, such as extractor rollers, of the types commonly used in continuous casting, placed downstream of the thickness reduction device.
  • the extraction speed is then determined by the extraction means, and the speed of the thickness reduction cylinders is controlled by that of the extraction means.
  • the extraction means can also be independent of the thickness reduction device.
  • the rolling rolls can be free to rotate, the extraction being carried out only by specific extraction means.
  • the edges of the cylinders 22 will be shaped so as not to create significant stresses in the skin of the product at the connection 13 between the central zone 6, and the edges 7.
  • the edge of the cylinders may for example be shaped as a rounded 16 connecting the cylindrical surface 14 with the side faces 15 of the cylinders. The radius of curvature of this rounding will be adapted according to the desired thickness reduction and the nature of the metal being cast.
  • the invention is not limited to the use of a mold of constant rectangular section. This may for example have large concave walls, the product which results therefrom then having a thickness in its middle greater than that of the edges.
  • It may also have a rectangular section only at the outlet of the mold, at its lower end.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP90470009A 1989-04-06 1990-03-16 Procédé et installation de coulée de produits métalliques minces à réduction d'épaisseur sous la lingotière Ceased EP0391824A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8904857A FR2647377B1 (fr) 1989-04-06 1989-04-06 Procede et installation de coulee de produits metalliques minces a reduction d'epaisseur sous la lingotiere
FR8904857 1989-04-06

Publications (1)

Publication Number Publication Date
EP0391824A1 true EP0391824A1 (fr) 1990-10-10

Family

ID=9380657

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90470009A Ceased EP0391824A1 (fr) 1989-04-06 1990-03-16 Procédé et installation de coulée de produits métalliques minces à réduction d'épaisseur sous la lingotière

Country Status (11)

Country Link
US (1) US5042563A (ja)
EP (1) EP0391824A1 (ja)
JP (1) JPH02295658A (ja)
KR (1) KR900015839A (ja)
CA (1) CA2013855A1 (ja)
CS (1) CS163990A2 (ja)
DD (1) DD293283A5 (ja)
FR (1) FR2647377B1 (ja)
HU (1) HUT57105A (ja)
PL (1) PL284679A1 (ja)
RU (1) RU1833244C (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993004802A1 (en) * 1991-09-12 1993-03-18 Giovanni Arvedi A process and apparatus for the manufacture of billets and blooms from a continuously last steel showing high or excellent quality
EP0545510A1 (de) * 1991-11-26 1993-06-09 MANNESMANN Aktiengesellschaft Verfahren zur Erzeugung von Langprodukten aus Stahl
AU658451B2 (en) * 1991-09-12 1995-04-13 Giovanni Arvedi A process and an apparatus for the manufacture of billets and blooms from a continuously cast steel showing high or excellent quality

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9100911A (nl) * 1991-03-22 1992-10-16 Hoogovens Groep Bv Inrichting en werkwijze voor het vervaardigen van warmgewalst staal.
DE4123956C2 (de) * 1991-07-19 1994-07-21 Thyssen Stahl Ag Verfahren und Anlage zum Herstellen eines Metallstranges durch Gießen
EP0535368B1 (de) * 1991-09-19 1996-06-05 Sms Schloemann-Siemag Aktiengesellschaft Verfahren und Anlage zur Herstellung von Stahlband
DE4438118C2 (de) * 1994-10-26 2003-02-13 Siemens Ag Zweiwalzen-Gießmaschine
US6496120B1 (en) * 1998-11-05 2002-12-17 Steel Authority Of India Limited System for on line continuous skidding detection in rolling mills
DE10112716A1 (de) * 2001-03-16 2002-09-19 Sms Demag Ag Verfahren und Anlage zum Herstellen von metallischem Warmband aus gegossenem Dünnband
DE10119550A1 (de) * 2001-04-21 2002-10-24 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen von Stranggu-Vormaterial
JP5262845B2 (ja) * 2009-03-04 2013-08-14 富士通株式会社 電子部品取り外し方法
JP7127484B2 (ja) * 2018-10-30 2022-08-30 日本製鉄株式会社 金属板の製造方法及び金属板製造設備

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1102392A (fr) * 1953-07-04 1955-10-19 Mannesmann Ag Procédé de coulée par extrusion de cordons sans retassures, de métaux façonnables, notamment en acier ou autres alliages de fer façonnables à chaud
FR1470209A (fr) * 1966-02-28 1967-02-17 Mannesmann Ag Rouleaux de transport pour des installations de coulée continue
CH490912A (de) * 1967-08-12 1970-05-31 Olsson Ag Erik Verfahren zum Schliessen von Hohlräumen in gegossenem Halbzeug
DE2733276A1 (de) * 1976-07-30 1978-02-02 Jernkontoret Fa Verfahren bei stranggiessen von staehlen und metallegierungen mit seigerungsneigung und vorrichtung zur durchfuehrung des verfahrens

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5568102A (en) * 1978-11-14 1980-05-22 Nippon Kokan Kk <Nkk> Widening method for breadth of cast billet in continuous casting work
JPS60184455A (ja) * 1984-03-01 1985-09-19 Nippon Steel Corp 圧下を加える連鋳片の製造方法
JPS61132247A (ja) * 1984-11-30 1986-06-19 Kawasaki Steel Corp 連続鋳造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1102392A (fr) * 1953-07-04 1955-10-19 Mannesmann Ag Procédé de coulée par extrusion de cordons sans retassures, de métaux façonnables, notamment en acier ou autres alliages de fer façonnables à chaud
FR1470209A (fr) * 1966-02-28 1967-02-17 Mannesmann Ag Rouleaux de transport pour des installations de coulée continue
CH490912A (de) * 1967-08-12 1970-05-31 Olsson Ag Erik Verfahren zum Schliessen von Hohlräumen in gegossenem Halbzeug
DE2733276A1 (de) * 1976-07-30 1978-02-02 Jernkontoret Fa Verfahren bei stranggiessen von staehlen und metallegierungen mit seigerungsneigung und vorrichtung zur durchfuehrung des verfahrens

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 25 (M-450)[2082], 31 janvier 1986, page 149 M 450; & JP-A-60 184 455 (SHIN NIPPON SEITETSU K.K.) 19-09-1985 *
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 326 (M-532)[2382], 6 novembre 1986, page 57 M 532; & JP-A-61 132 247 (KAWASAKI STEEL CORP.) 19-06-1986 *
PATENT ABSTRACTS OF JAPAN, vol. 4, no. 108 (M-24)[590], 5 août 1980, page 143 M 24; JP-A-55 068 102 (NIPPON KOKAN K.K.) 22-05-1980 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993004802A1 (en) * 1991-09-12 1993-03-18 Giovanni Arvedi A process and apparatus for the manufacture of billets and blooms from a continuously last steel showing high or excellent quality
AU658451B2 (en) * 1991-09-12 1995-04-13 Giovanni Arvedi A process and an apparatus for the manufacture of billets and blooms from a continuously cast steel showing high or excellent quality
US5497821A (en) * 1991-09-12 1996-03-12 Giovanni Arvedi Manufacture of billets and blooms from a continuously cast steel
EP0545510A1 (de) * 1991-11-26 1993-06-09 MANNESMANN Aktiengesellschaft Verfahren zur Erzeugung von Langprodukten aus Stahl

Also Published As

Publication number Publication date
PL284679A1 (en) 1991-08-26
HU902044D0 (en) 1990-08-28
FR2647377B1 (fr) 1993-04-30
HUT57105A (en) 1991-11-28
DD293283A5 (de) 1991-08-29
JPH02295658A (ja) 1990-12-06
KR900015839A (ko) 1990-11-10
US5042563A (en) 1991-08-27
CA2013855A1 (fr) 1990-10-06
RU1833244C (en) 1993-08-07
CS163990A2 (en) 1991-11-12
FR2647377A1 (fr) 1990-11-30

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