EP1046442A1 - Verfahren und Vorrichtung zum Stranggiessen von Dünnbrammen - Google Patents

Verfahren und Vorrichtung zum Stranggiessen von Dünnbrammen Download PDF

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Publication number
EP1046442A1
EP1046442A1 EP20000107872 EP00107872A EP1046442A1 EP 1046442 A1 EP1046442 A1 EP 1046442A1 EP 20000107872 EP20000107872 EP 20000107872 EP 00107872 A EP00107872 A EP 00107872A EP 1046442 A1 EP1046442 A1 EP 1046442A1
Authority
EP
European Patent Office
Prior art keywords
cast strip
liquid core
guide roll
rolls
core reduction
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.)
Withdrawn
Application number
EP20000107872
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English (en)
French (fr)
Inventor
Masahiro In Niihama Works Sumitomo Heavy Ikeda
Hirohisa Sumitomo Metal Industries Ltd. Kikuchi
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.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo Heavy Industries Ltd
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 Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Publication of EP1046442A1 publication Critical patent/EP1046442A1/de
Withdrawn legal-status Critical Current

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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
    • B22D11/12—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 continuous casting method and a continuous casting machine of thin-slab cast strips.
  • Fig. 3 shows the basic configuration of a continuous casting machine to roll unsolidified slabs as described above.
  • the numeral 1 is a mold.
  • a vertical zone A is provided immediately below the mold 1, and a bending zone B and a liquid core reduction zone C follow the vertical zone A.
  • the bottom of the liquid core reduction zone C is the liquid core reduction completion point P, which is followed by guiding zones D and E.
  • a cast strip is cooled in the vertical zone A so as to develop its solidified shell to a certain extent.
  • the guiding-zone radii of curvature r1 to r5 at the points of the rolls constituting the bending zone B are gradually reduced in the order of r1 to r5 so as to reduce the strain in the cast strip. Therefore, the bending zone B may be called "multipoint-bending zone.”
  • the cast strip passed through the bending zone B and entered into the liquid core reduction zone C develops its solidified shell gradually, its center portion remaining unsolidified, and is rolled by liquid core reduction rolls to be reduced in its thickness.
  • the guide-zone radii of curvature at the points of the rolls in the liquid core reduction zone C are identical, and hence the zone C may be called "constant circular-arc zone.”
  • Liquid core reduction a cast strip while it has still an unsolidified portion in it reduces the liquid core reduction pressure required for the liquid core reduction and the radius required of the liquid core reduction rolls, allowing the simplification of construction around the liquid core reduction rolls.
  • the reason why the above continuous casting machine has a bending zone B and a liquid core reduction zone C separately and do the bending and the liquid core reduction of a cast strip separately is to prevent longitudinal cracks in and breakouts on the surfaces of the cast strip.
  • the vertical-and-bending-type continuous casting machine described above has a relatively long distance between the surface (meniscus) of melted steel in the mold and the constant circular-arc zone (liquid core reduction zone C).
  • the longer the distance becomes the thicker the shell of a cast strip grows, reducing the unsolidified portion in the cast strip and making the liquid core reduction of the cast strip difficult. To cope with this problem, the casting speed has to be raised.
  • the constant casting speed has to be about 5 m/min. or higher. If all kinds of steel require such a casting speed, the operational flexibility of the continuous casting machine is reduced and its operation becomes difficult.
  • the object of the present invention is to provide a continuous casting method and a continuous casting machine for producing thin-slab cast strips stably.
  • a method of casting a thin-slab cast strip with a continuous casting machine of a vertical bending type is characterized by bending a cast strip drawn out of the mold in the bending zone and liquid core reduction it simultaneously in an unsolidified state.
  • the method of the first aspect wherein said pre-solidification liquid core reduction of the cast strip is made by applying pressure to the cast strip from the inside of the guide roll radius being bent of the cast strip toward the outside of the guide roll radius.
  • a continuous casting machine of a vertical bending type for casting thin-slab cast strips wherein a liquid core reduction roll segment is provided so as to constitute rolls in the bending zone below the mold.
  • Its liquid core reduction roll segment comprises a group of fixed rolls disposed outside the guide roll radius being bent of a cast strip and a group of movable rolls disposed inside the guide roll radius.
  • the group of movable rolls is supported by a tilting frame guide roll radius with an oil-hydraulic cylinder so as to be moved toward and away from the group of fixed rolls.
  • the advantages offered by the first aspect of the invention are as follows.
  • the distance between the meniscus and the liquid core reduction completion point can be shortened. It means that the cast strip is rolled while it has a thin shell and a large unsolidified pottion in it. Therefore, a prescribed reduction can be achieved at a relatively low casting speed. Accordingly, the minimum casting speed required is reduced, which increases the operational flexibility of the casting machine. Thus, it can be operated stably.
  • its pre-solidification liquid core reduction can be made without causing cracks in it, contrary to the common sense in the art.
  • the advantage offered by the second aspect of the invention is as follows.
  • the advantage offered by the third aspect of the invention is as follows. Because a liquid core reduction-roll segment is disposed in the bending zone, a cast strip can be rolled while it is being bent. In this way, the pre-solidification liquid core reduction of a cast strip can be made near the mold. Accordingly, this invention is suitable for effecting the invention of the first aspect.
  • the advantages offered by the fourth aspect of the invention are as follows. Because the reduction can be adjusted by changing the distance between the group of fixed rolls and the group of movable rolls, thin-slab cast strips of any thickness can be produced. In addition, because a cast strip is rolled by pressing the group of movable rolls inside the guide roll radius being bent of the cast strip toward the group of fixed rolls, bending strain in the cast strip can be reduced. Accordingly, this invention is suitable for effecting the invention of the second aspect.
  • the numeral 1 is a mold.
  • a vertical zone A, a bending zone B, a liquid core reduction zone C, and guiding zones D, E, and F are provided immediately below the mold 1 downward in the order of description.
  • the drawing-out path of cast strips is bent, or curved, as shown in Fig. 1.
  • the "inside of the bent guide roll radius” means hereinafter the side on which the center of curvature of the bent guide roll radius sits, and the "outside of the bent guide roll radius” means the opposite side.
  • the present invention is characterized by the bending zone B and the liquid core reduction zone C overlapping each other.
  • the bending zone B comprises about six to ten pairs of rolls arranged along the drawing-out path ("a pair of rolls” means a set of a roll inside the bent guide roll radius and a roll outside the bent guide roll radius).
  • the vertical zone A provided on the bending zone B has five pairs or so of rolls 2.
  • Disposed below the vertical zone A is a liquid core reduction-roll segment 4 which comprises six pairs or so of liquid core reduction rolls 3 built in frame guide roll radiuss.
  • the top five pairs or so of liquid core reduction rolls 3 of the liquid core reduction-roll segment 4 have two functions of bending and liquid core reduction a cast strip.
  • the upper five pairs or so of rolls 3 are arranged so as to reduce the guiding-zone radius of curvature gradually, and they, at their fixed positions in the liquid core reduction-roll segment 4, bend a cast strip gradually. Namely, the upper five or so pairs of rolls 3 constitute a multipoint-bending zone.
  • the bottom two pairs or so of rolls 3 of the liquid core reduction-roll segment 4 have only the function of liquid core reduction a cast strip, and the position of the bottom pair of rolls 3 is the liquid core reduction-completion point P.
  • the numeral 5 is a fixed frame guide roll radius outside the bent guide roll radius of the drawing-out path; 6, an upper fixed frame guide roll radius inside the bent guide roll radius; 7, a lower tilting frame guide roll radius inside the bent guide roll radius.
  • the fixed frame guide roll radius 5 is fixed to an appropriate frame member of the continuous casting machine and a plurality of rolls 8 are arranged from the top to the bottom in and supported by the fixed frame guide roll radius 5.
  • the fixed frame guide roll radius 6 is fixed to a frame member inside the bent guide roll radius of the drawing-out path, and the rolls 2 described above are supported by the fixed frame guide roll radius 6 so as to be freely rotatable.
  • the tilting frame guide roll radius 7 is supported by a pivot pin 9 on the bottom of the fixed frame guide roll radius 6 so that it can tilt freely.
  • a tilting oil-hydraulic cylinder 10 is fixed to the longitudinally middle portion of the tilting frame guide roll radius 7, and its piston rod 11 is connected, with a pin, to a bracket 12 which is fixed to the fixed frame guide roll radius 5.
  • the liquid core reduction rolls 3 described above are supported by the tilting frame guide roll radius 7 so as to be rotatable freely.
  • the lower tilting frame guide roll radius 7 can be moved away from and toward the fixed frame guide roll radius 5.
  • a solid line shows the liquid core reduction position
  • a dash-double dot line shows the nonliquid core reduction position
  • the pairs of rolls 8 and 3 constitute a multipoint-bending zone to bend a cast strip gradually.
  • the tilting frame guide roll radius 7 is moved toward the fixed frame guide roll radius 5
  • the space between the rolls 8 and the rolls 3 is narrowed and, thereby, a cast strip is rolled.
  • the re-duction can be continuously changed by changing the tilting distance "d".
  • the pre-solidification liquid core reduction of a thin-slab cast strip can be made in an upper zone of which most part overlaps the bending zone, the minimum casting speed required for casting is reduced, which enables stable casting operation.
  • the minimum casting speed required is approximately 3.8 m/min. in accordance with the present embodiment, whereas it is about 5 m/min. in accordance with the prior art.
  • the present embodiment brings about a large flexibility of casting speed and enables stable casting operation.
  • cast strips below 150 mm in thickness could be rolled in unsolidified states to thickness of 35-70 mm.
  • the liquid core reduction-completion point P was within four meters of the meniscus, and the continuous casting machine could be operated stably at casting speed of about 3 m/min. with reduction of 15 mm or less per roll.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP20000107872 1999-04-21 2000-04-12 Verfahren und Vorrichtung zum Stranggiessen von Dünnbrammen Withdrawn EP1046442A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11298199A JP3355311B2 (ja) 1999-04-21 1999-04-21 薄スラブ鋳片の連続鋳造方法および連続鋳造機
JP11298199 1999-04-21

Publications (1)

Publication Number Publication Date
EP1046442A1 true EP1046442A1 (de) 2000-10-25

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Family Applications (1)

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EP20000107872 Withdrawn EP1046442A1 (de) 1999-04-21 2000-04-12 Verfahren und Vorrichtung zum Stranggiessen von Dünnbrammen

Country Status (2)

Country Link
EP (1) EP1046442A1 (de)
JP (1) JP3355311B2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101920316A (zh) * 2010-08-03 2010-12-22 中国重型机械研究院有限公司 一种解决结晶器液面波动的连铸机改造方法
WO2011089045A1 (de) * 2010-01-22 2011-07-28 Siemens Vai Metals Technologies Gmbh Strangführungselement zum führen und stützen eines metallischen strangs in einer stranggiessmaschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5270519B2 (ja) * 2009-11-17 2013-08-21 株式会社神戸製鋼所 連続鋳造設備のセグメント交換装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010792A (en) * 1974-11-25 1977-03-08 Nippon Kokan Kabushiki Kaisha Method for continuously casting steel
JPS58173064A (ja) * 1982-04-02 1983-10-11 Hitachi Ltd 連続鋳造装置
US5018569A (en) * 1988-07-04 1991-05-28 Mannesmann Ag Method for continuous casting of thin slab ingots
EP0625388A1 (de) * 1993-05-17 1994-11-23 DANIELI & C. OFFICINE MECCANICHE S.p.A. Verfahren und Vorrichtung zum geregleten Vorwalsen von aus einer Stranggiessanlage austretenden Dünnbrammen
EP0776708A1 (de) * 1995-11-28 1997-06-04 DANIELI & C. OFFICINE MECCANICHE S.p.A. Verfahren und Vorrichtung zum geregelten Vorwalzen von aus einer Stranggiessanlage austretenden Dünnbrammes
DE19639302A1 (de) * 1996-09-25 1998-03-26 Schloemann Siemag Ag Verfahren und Vorrichtung zur Erzeugung von dünnen Brammen auf einer Stranggießanlage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010792A (en) * 1974-11-25 1977-03-08 Nippon Kokan Kabushiki Kaisha Method for continuously casting steel
JPS58173064A (ja) * 1982-04-02 1983-10-11 Hitachi Ltd 連続鋳造装置
US5018569A (en) * 1988-07-04 1991-05-28 Mannesmann Ag Method for continuous casting of thin slab ingots
EP0625388A1 (de) * 1993-05-17 1994-11-23 DANIELI & C. OFFICINE MECCANICHE S.p.A. Verfahren und Vorrichtung zum geregleten Vorwalsen von aus einer Stranggiessanlage austretenden Dünnbrammen
EP0776708A1 (de) * 1995-11-28 1997-06-04 DANIELI & C. OFFICINE MECCANICHE S.p.A. Verfahren und Vorrichtung zum geregelten Vorwalzen von aus einer Stranggiessanlage austretenden Dünnbrammes
DE19639302A1 (de) * 1996-09-25 1998-03-26 Schloemann Siemag Ag Verfahren und Vorrichtung zur Erzeugung von dünnen Brammen auf einer Stranggießanlage

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 009 (M - 268) 14 January 1984 (1984-01-14) *
PLESCHIUTSCHNIGG F.P.: "THE I.S.P. TECHNOLOGY, SHORT PRODUCTION LINE FOR HOT STRIPS AND PLATES", CAHIERS D'INFORMATIONS TECHNIQUES DE LA REVUE DE METALLURGIE, vol. 89, no. 6, 1 June 1992 (1992-06-01), pages 547 - 561, XP000296106 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011089045A1 (de) * 2010-01-22 2011-07-28 Siemens Vai Metals Technologies Gmbh Strangführungselement zum führen und stützen eines metallischen strangs in einer stranggiessmaschine
CN102712037A (zh) * 2010-01-22 2012-10-03 西门子Vai金属科技有限责任公司 用于在连铸机中对金属的连铸坯进行导引和支撑的连铸坯导引元件
CN102712037B (zh) * 2010-01-22 2015-05-06 西门子Vai金属科技有限责任公司 用于在连铸机中对金属的连铸坯进行导引和支撑的连铸坯导引元件
CN101920316A (zh) * 2010-08-03 2010-12-22 中国重型机械研究院有限公司 一种解决结晶器液面波动的连铸机改造方法
CN101920316B (zh) * 2010-08-03 2015-08-19 中国重型机械研究院有限公司 一种解决结晶器液面波动的连铸机改造方法

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JP2000301303A (ja) 2000-10-31
JP3355311B2 (ja) 2002-12-09

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