EP0996514B1 - Procede et dispositif pour la production de brames minces - Google Patents

Procede et dispositif pour la production de brames minces Download PDF

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Publication number
EP0996514B1
EP0996514B1 EP98936178A EP98936178A EP0996514B1 EP 0996514 B1 EP0996514 B1 EP 0996514B1 EP 98936178 A EP98936178 A EP 98936178A EP 98936178 A EP98936178 A EP 98936178A EP 0996514 B1 EP0996514 B1 EP 0996514B1
Authority
EP
European Patent Office
Prior art keywords
plane
parts
slab
mould
broad
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
EP98936178A
Other languages
German (de)
English (en)
Other versions
EP0996514A1 (fr
Inventor
Werner Rahmfeld
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.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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 SMS Demag AG filed Critical SMS Demag AG
Publication of EP0996514A1 publication Critical patent/EP0996514A1/fr
Application granted granted Critical
Publication of EP0996514B1 publication Critical patent/EP0996514B1/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
    • B22D11/06—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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408—Moulds for casting thin slabs
    • 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
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling

Definitions

  • the invention relates to a continuous caster according to the preamble of patent claim 1 and a method for producing thin slabs according to the preamble of patent claim 8.
  • a liquid-cooled, width-adjustable plate mold for the continuous casting of steel strands in slab format is known, in particular for a thickness of the slabs below 100 mm, in which the shape of the broad side plates at the strand exit end of the mold corresponds to the strand format to be produced, the Broad side plates are designed as a flat surface in the adjustment area of the narrow side plates.
  • a device for the continuous casting of flat slabs in particular a steel slab with a thickness of less than 80 mm, is known, in which a smaller, similarly arched cross section on the strand exit side of the mold faces the larger, curved cross section on the pouring side and at least one Roll of at least one pair of rolls which has a supporting and guiding means arranged downstream of the mold and a caliber which is adapted to the emerging bulging strand.
  • the mold shape known from this document as well as the shape of the support and guide means arranged downstream of the mold are designed such that the mold has a shape adapted to the strand format in the edge region, that is to say Parallel side wall areas are already present in the mold and continue with the support and guide rollers of the strand guide frame.
  • a continuous caster for guiding strands is known, the broad side plates of which are concave and the concavity is constant from the upper edge of the mold to the exit of the mold and beyond to the last roll of the strand guide.
  • the concave shape advantageously extends from the beginning of one narrow side plate to the beginning of the other, opposite narrow side plate.
  • the concave shape of the broad side plates known from this document relates to a relatively complicated shape which is essentially influenced by the deflection of the roller and the current wear.
  • the strand shell in the central mold width area and thus in the funnel area is subject to a continuous bending deformation due to the withdrawal movement until it emerges from the funnel area.
  • the invention aims to provide a continuous casting device with a mold and strand guide rollers with simple structural means, which reduce the load on the strand shell and minimize the risk of longitudinal cracks and breakthroughs.
  • the mold broad sides are largely composed of flat surface parts and the strand guide rollers have a contour that is composed essentially of straight lines.
  • a flat surface is provided in the central area, which is maintained in the strand guide direction and is completely taken over by the central parts of the guide rollers beyond the mouth of the mold.
  • Flat surfaces in the direction of the narrow sides are also provided on both sides of this flat central part. The shape and inclination of these flat surfaces are exactly maintained from the entrance of the mold to the end of the strand guide frame.
  • Transition pieces are provided between the flat central surface of the mold and the flat side surfaces arranged on both sides. The extension of these transition pieces ends within the mold, so that the lower area corresponds to the strand format. In addition, this shape allows the cold strand to be introduced and removed easily when the continuous casting machine is cast on.
  • the middle part is designed to be flat in the pouring area.
  • the flat central parts of both broad slab sides taper towards each other in the strand direction until they are guided within the mold parallel to the mold mouth, forming a so-called crown.
  • the central parts in the pouring area are flat and parallel and outside the shadow area of the Dipping spout in the strand guide direction is connected by a connecting part to the central part having the "crown" in the mouth region of the mold.
  • the central parts have a shape, the contour lines of which are parallel to one another and the longitudinal extension of which is S-shaped in the strand conveying direction. The mouth of this S-shape merges tangentially into the neighboring areas.
  • the slab produced in a mold according to the invention has broad sides which are composed of three flat surfaces, the side surfaces being conical and the central surface being designed to be higher than the edge region.
  • This slab shape enables the slab to be centered better, especially at the strand withdrawal speeds which are customary today. This prevents uncontrolled movement of the strand in the mold and a so-called snaking in the strand guide frame.
  • the outer shape of the strand shell of the slab thus produced remains absolutely constant at least up to the bottom of the sump.
  • the only change to the slab is in the direction of thickness, whereby only the narrow sides are deformed.
  • the central mold width area namely the area designed as a trough, remains unchanged in its flat shape until it solidifies and ensures the most favorable lubrication conditions in the mold. Due to the mold shape according to the invention, the casting powder wets the strand surface in a definable amount in the area of greatest longitudinal crack sensitivity. Thanks to its flat shape, the strand shell is therefore not subject to any bending stress in this central mold width range, which favors the occurrence of cracks near the surface.
  • a separate cooling medium guide has a special influence on the solidification conditions of the strand shell in the area of the transition parts and the connecting part.
  • the subsequent strand guide scaffold has support and guide rollers which ensure safe transport of the slab, which still has a sump.
  • different roll forms are proposed, namely complete rolls or split rolls.
  • the 2/3 roll has a contour corresponding to the assignment of the middle part to the side part.
  • complete rolls can be used, in particular for smaller dimensions, which have the negative shape of the lower part of the mold as a contour.
  • Figures 1 and 2 show in perspective a mold with a downstream strand guide.
  • the mold has broad sides 21, between which narrow sides 22 are clamped.
  • the broad sides have a central surface 23, which is flat and is guided from the entrance to the mold mouth.
  • the central parts are arranged parallel to each other with respect to their height line and overall run conically towards one another in the strand conveying direction.
  • the middle parts 23 are connected to side parts 24 and 25 via transition parts 26 and 27.
  • transition parts 26 and 27 are wedge-shaped, the wedge tip 28 still being spaced within the mold by the distance a from the mold entrance.
  • Adjustment elements 31 are provided on the narrow sides 22, by means of which the narrow sides 22 clamped between the broad sides 21 can be adjusted to change the slab format.
  • Support and guide rollers 41 are provided below the mold.
  • Split rollers 43-45 having a cylindrical shape are shown in the present example.
  • b denotes the width of the central part 23.
  • the width b remains constant from the pouring area of the mold to the mold mouth.
  • the side plates In the pouring area, the side plates have a width f which, following the conical transition part 26 or 27, widen to the width g and keep this width constant up to the mouth of the mold.
  • the center plate has a width c in the pouring area, which widens following the wedge-shaped transition parts 26, 27 in the continuous casting direction up to the length a of the mold to the width b and from there remains constant until the mold opens.
  • the width f of the side plates 24 and 25 remains constant over the entire length L of the mold.
  • a dip spout 11 which has a tubular part 12 and a rectangular part 14, projects into the mold. Its mouth 13 protrudes below the melt level S P (dashed line).
  • FIG. 3 shows a section aa through the broad sides 21 of the mold.
  • the flat center plate 23 is shown, which merges at a distance a into a straight area which is parallel to the opposite center plate.
  • a first section of the center plate 23 is guided flat and parallel to the center axis I. This parallel part is followed by a tangential transition, a connecting part 29 which has an S-shaped shape in section and in turn merges into the parallel part of the center plate 23 in the direction of the mouth.
  • the spade-shaped part 14 of the immersion spout 11 projects into the mold to below the melt level S P.
  • the support and guide rollers 41 are shown below the mold.
  • the dashed line represents the distance D s of the side plates 24 and 25, and thus also the narrow side of the slab.
  • FIG. 4 shows a plan view of a broad side of the mold, together with the immersion spout 11 with its tubular part 12 and its rectangular part 14, as well as the mouth 13, which projects below the melt level S P.
  • the side plate 24 is shown, which has a constant width g.
  • the side plate 25 is shown, which has a width f in the entrance area of the mold, which has a width g conically following the conical transition part from the wedge tip 28.
  • the center plate 23 has a constant width b with a view of the left side of the figure.
  • the center plate 23 has a width c, which widens corresponding to the conical transition part 26 and has the constant width b from the wedge tip 28.
  • rollers 43, 44 are shown in the present figure, each of which has a cylindrical shape and are inclined towards one another in accordance with the inclination of the sides and the central surface of the slab that produces it.
  • the rollers shown in positions 3 and 4 of the stand consist of a 2/3 roller 46 and a cylindrical roller 44.
  • the roller 46 has a cylindrical section and a conical part which is adapted to the inclination of the side surfaces.
  • Positions 5 and 6 show rolls whose complete contour corresponds to the slab produced in the upstream mold, both in the middle area and in the side areas.
  • FIG. 5 shows a section through the guide frame and the slab, which also has a sump in this area.
  • the situation is shown with the opposing pairs of rollers in the central region 43 and in the side regions 44, 45. These rollers support the broad sides 51 of the shell box composed of the broad sides 51 and the narrow sides 52.
  • the shell box envelops the melt S, which forms the sump within the slab in this area.
  • a 2/3 roller 46 which supports the larger part of the slab broad side 51, and which is adjoined in the right part of the picture by a cylindrical roller 44 which supports the narrow side region.
  • the present sketch clearly shows the slab having a "crown", which can be guided exactly through the strand guide frame by the roll forms proposed here.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Claims (10)

  1. Installation de coulée continue pour engendrer des brames minces, comportant une coquille réglable latéralement, dont les faces larges de coquille (21) sont réalisées, au moins dans la zone de réglage des faces étroites de coquille (22), comme surfaces latérales planes (24, 25), dans laquelle pénètre une busette de coulée à immersion (11) et pour laquelle une section transversale cintrée dans la zone centrale sur le côté de sortie de barre fait face à une section transversale cintrée plus grande sur le côté de coulée, et comportant des paires de rouleaux de guidage et d'appui agencés en aval de la coquille, qui présentent un calibre adapté à la barre cintrée sortant,
    caractérisée en ce que :
    a) la busette de coulée à immersion (11) possède une partie d'extrémité réalisée de façon analogue à une bêche et recevant l'embouchure, avec une épaisseur maximale (d) correspondant à d = 0,3 à 0,5xDE, DE étant la distance des faces larges (21) de la coquille dans la zone de coulée,
    b) les faces larges de coquille (21) présentent, au moins dans la zone d'ombre de la busette de coulée à immersion (11), des parties centrales (23) qui sont agencées parallèlement les unes aux autres de façon correspondant à leurs courbes de niveau,
    c) les faces latérales planes (24, 25) sont réalisées de façon conique en direction des faces étroites de coquille (22),
    d) les parties centrales à surface plane (23) sont reliées aux surfaces latérales planes (24, 25) par des parties de transition (26, 27),
    e) les parties de transition (26, 27) s'amincissent en forme de coin dans la direction de transport de la barre, et la pointe du coin (28) s'achève à la distance (a), mesurée à partir du bord supérieur de coquille, avec a = 0,5 à 0,8xL, où L = longueur de coquille, et
    f) les rouleaux de guidage et d'appui (41) présentent un contour qui correspond à la partie centrale plane (23) et aux surfaces latérales planes (24, 25) des faces larges de coquille (21) dans la zone d'embouchure de la coquille.
  2. Installation de coulée continue selon la revendication 1, caractérisée en ce que les plaques centrales (23) sont réalisées comme des surfaces planes, qui, dans la direction de transport des barres, se déplacent de façon conique sous un angle α, avec α = 5 à 10° pour a = 0,5 à 0,8xL.
  3. Installation de coulée continue selon la revendication 1, caractérisée en ce que les parties centrales (23), dans la zone d'ombre de la busette de coulée à immersion (11), sont réalisées de façon plane jusqu'à a = 0,5 à 0,8xL et sont agencées de façon guidée parallèlement l'une par rapport à l'autre, et en ce que des parties de liaison (29) sont prévues qui sont parallèles relativement à leurs courbes de niveau et présentent, dans la direction de transport des barres, une conformation en forme de S, leurs extrémités se convertissant à chaque fois de façon tangentielle en la partie précédente et la partie suivante des parties centrales (23) et leurs parties de transition (26, 27) étant adaptées, concernant leur extension longitudinale jusqu'à la pointe du coin (28), à la partie de liaison (29).
  4. Installation de coulée continue selon la revendication 1, caractérisée en ce que les parties de transition (26, 27) sont réalisées comme surface cintrée, la surface cintrée se raccordant tangentiellement d'une part aux surfaces latérales respectives (24, 25) et d'autre part aux parties centrales (23) et présentant, au centre, un point d'inflexion.
  5. Installation de coulée continue selon la revendication 1, caractérisée en ce que les rouleaux de guidage et d'appui (41) sont réalisés comme rouleaux divisés (42-44), les paliers respectifs (47) étant prévus dans la zone des parties centrales planes (23).
  6. Installation de coulée continue selon la revendication 1, caractérisée en ce que, de façon correspondant à la déformation de la brame, des rouleaux sont prévus dans la cage de guidage qui sont réalisés de façon cylindrique dans la zone centrale et, dans les zones latérales, de façon conique avec un diamètre s'agrandissant vers l'extérieur.
  7. Installation de coulée continue selon la revendication 1 ou 4, caractérisée en ce que les parties de transition (26, 27) sont raccordées à un dispositif de refroidissement séparé.
  8. Procédé pour fabriquer des brames minces ayant un bombement prédéfini de leurs faces larges dans une installation de coulée continue, dans laquelle une busette de coulée à immersion servant à amener la matière en fusion pénètre dans une coquille constituée de faces larges et de faces étroites, qui est disposée en amont d'un guide de barre, grâce auquel la brame, dont la coque de barre enveloppe le cratère encore liquide, est guidée,
    caractérisé par les étapes suivantes :
    a) les faces larges de la coque de barre sont déformées de façon plane dans la zone d'une busette de coulée à immersion réalisée de façon analogue à une bêche, de plus de façon parallèle relativement à leurs courbes de niveau, et
    b) à l'extérieur de la zone d'ombre de la busette de coulée à immersion de façon plane et en s'amincissant de façon conique vers les faces étroites ;
    c) dans la direction de coulée continue, les parties centrales des faces larges de brame se trouvant à l'intérieur de la zone d'ombre déformées de façon plane sont amenées l'une l'autre de façon conique jusqu'à une extension en longueur de la coquille de 40 à 60% de sorte que leurs bords latéraux s'adaptent aux extrémités des parties de faces larges de brame planes s'amincissant de façon conique vers les faces étroites, et
    d) des surfaces de liaison en forme de coin sont reliées aux parties centrales des faces larges de brame planes et aux parties de bord des faces larges de brame se trouvant à l'extérieur de la zone d'ombre de la busette de coulée à immersion, planes, respectives ;
    e) ensuite, dans la zone d'embouchure ainsi qu'après avoir quitté la coquille, le bombement formé à chaque fois à partir de trois parties de surface planes des faces larges de la coque de barre est maintenu constant concernant sa forme jusqu'à la pointe de cratère liquide de la brame.
  9. Procédé selon la revendication 8,
    caractérisé en ce que, pour réduire l'épaisseur de la brame dans la zone de la cage de guidage de barre; exclusivement les faces étroites de la brame sont déformées.
  10. Procédé selon la revendication 8,
    caractérisé en ce que les transitions en forme de coin entre la partie centrale de la brame plane se trouvant dans la zone d'ombre de la busette de coulée à immersion et les parties des faces larges de brame s'amincissant de façon conique vers les faces étroites présentent une forme qui, dans les extensions longitudinales des parties centrales de brame, forme un angle α < 5° et représente une surface cintrée qui, présentant de façon centrale un point d'inflexion, se raccorde au niveau de ses bords de façon tangentielle aux deux surfaces voisines.
EP98936178A 1997-06-30 1998-06-15 Procede et dispositif pour la production de brames minces Expired - Lifetime EP0996514B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19728957A DE19728957A1 (de) 1997-06-30 1997-06-30 Verfahren und Vorrichtung zum Erzeugen von Dünnbrammen
DE19728957 1997-06-30
PCT/DE1998/001633 WO1999001244A1 (fr) 1997-06-30 1998-06-15 Procede et dispositif pour la production de brames minces

Publications (2)

Publication Number Publication Date
EP0996514A1 EP0996514A1 (fr) 2000-05-03
EP0996514B1 true EP0996514B1 (fr) 2003-09-10

Family

ID=7834893

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98936178A Expired - Lifetime EP0996514B1 (fr) 1997-06-30 1998-06-15 Procede et dispositif pour la production de brames minces

Country Status (11)

Country Link
US (1) US6810943B2 (fr)
EP (1) EP0996514B1 (fr)
KR (1) KR100573751B1 (fr)
AR (1) AR012755A1 (fr)
AT (1) ATE249299T1 (fr)
AU (1) AU8531998A (fr)
BR (1) BR9811275A (fr)
DE (2) DE19728957A1 (fr)
TR (1) TR199903303T2 (fr)
TW (1) TW372204B (fr)
WO (1) WO1999001244A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110198795A (zh) * 2016-11-18 2019-09-03 达涅利机械设备股份公司 用于薄板坯的连续铸造装置

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DE19742795A1 (de) † 1997-09-27 1999-04-01 Schloemann Siemag Ag Trichtergeometrie einer Kokille zum Stranggießen von Metall
AT410766B (de) * 2001-09-28 2003-07-25 Voest Alpine Ind Anlagen Durchlaufkokille
KR100940680B1 (ko) * 2002-12-27 2010-02-08 주식회사 포스코 박슬라브 연속주조용 깔대기형 주형
DE102005028703A1 (de) * 2005-06-20 2006-12-28 Siemens Ag Verfahren zur Regelung und/oder Steuerung eines Anstellsegmentes in einer Stranggießanlage und Vorrichtung hierfür
DE202012004204U1 (de) 2011-05-03 2012-06-15 Central Iron & Steel Research Institute Abgeschrägte Schmalseitenkupferplatte für Gussform mit trichterförmig gekrümmter Oberfläche

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DE2544556C3 (de) * 1975-10-04 1978-09-21 Demag Ag, 4100 Duisburg Stützrollengerüst für Staht-Brammenstranggießanlagen, insbesondere für Bogen-Brammenstranggießanlagen
DE3400220A1 (de) * 1984-01-05 1985-07-18 SMS Schloemann-Siemag AG, 4000 Düsseldorf Kokille zum stranggiessen von stahlband
US4716955A (en) * 1986-06-11 1988-01-05 Sms Concast Inc. Continuous casting method
DE3627991A1 (de) * 1986-08-18 1988-02-25 Mannesmann Ag Verfahren zum stranggiessen von brammen und einrichtung zur durchfuehrung des verfahrens
DE3640525C2 (de) * 1986-11-27 1996-02-15 Schloemann Siemag Ag Kokille zum Stranggießen von Stahlband
DE3721266A1 (de) * 1987-06-27 1989-01-12 Schloemann Siemag Ag Verstellbare stranggiesskokille zur erzeugung von vorprofilen fuer die traegerwalzung
DE3724628C1 (de) * 1987-07-22 1988-08-25 Mannesmann Ag Stranggiesskokille zur Erzeugung duenner Straenge im Brammenformat
DE4131829C2 (de) * 1990-10-02 1993-10-21 Mannesmann Ag Flüssigkeitsgekühlte Kokille für das Stranggießen von Strängen aus Stahl im Brammenformat
DE4201363C2 (de) * 1992-01-20 2000-08-10 Sms Demag Ag Kokille zum Stranggießen von Stahlband
IT1262073B (it) * 1993-02-16 1996-06-19 Danieli Off Mecc Lingottiera per colata continua di bramme sottili
DE4343124C2 (de) * 1993-12-17 1996-05-23 Schloemann Siemag Ag Kokille zum Stranggießen von Stahlband
DE4403050C1 (de) * 1994-01-28 1995-09-28 Mannesmann Ag Stranggießkokille zum Führen von Strängen
DE4403045C1 (de) * 1994-01-28 1995-09-07 Mannesmann Ag Stranggießanlage zum Führen von Strängen
DE19512208C1 (de) * 1995-03-21 1996-07-18 Mannesmann Ag Tauchausguß zum Gießen von Metall

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110198795A (zh) * 2016-11-18 2019-09-03 达涅利机械设备股份公司 用于薄板坯的连续铸造装置
CN110198795B (zh) * 2016-11-18 2021-06-01 达涅利机械设备股份公司 用于薄板坯的连续铸造装置

Also Published As

Publication number Publication date
AU8531998A (en) 1999-01-25
WO1999001244A1 (fr) 1999-01-14
DE19728957A1 (de) 1999-01-07
BR9811275A (pt) 2000-07-18
DE59809580D1 (de) 2003-10-16
US6810943B2 (en) 2004-11-02
KR100573751B1 (ko) 2006-04-24
AR012755A1 (es) 2000-11-08
ATE249299T1 (de) 2003-09-15
US20030150589A1 (en) 2003-08-14
KR20010014325A (ko) 2001-02-26
TR199903303T2 (xx) 2000-07-21
TW372204B (en) 1999-10-21
EP0996514A1 (fr) 2000-05-03

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