EP1002599B1 - Lingotière pour la coulée continue de métal - Google Patents

Lingotière pour la coulée continue de métal Download PDF

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Publication number
EP1002599B1
EP1002599B1 EP99122381A EP99122381A EP1002599B1 EP 1002599 B1 EP1002599 B1 EP 1002599B1 EP 99122381 A EP99122381 A EP 99122381A EP 99122381 A EP99122381 A EP 99122381A EP 1002599 B1 EP1002599 B1 EP 1002599B1
Authority
EP
European Patent Office
Prior art keywords
funnel
area
mold
strand
side walls
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
EP99122381A
Other languages
German (de)
English (en)
Other versions
EP1002599A1 (fr
Inventor
Jürgen SUCKER
Romeo Capotosti
Massimo Proietti Cerquoni
Alessandro Cristallini
Maria Rita Ridolfi
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
Acciai Speciali Terni SpA
Original Assignee
SMS Demag AG
Acciai Speciali Terni SpA
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, Acciai Speciali Terni SpA filed Critical SMS Demag AG
Publication of EP1002599A1 publication Critical patent/EP1002599A1/fr
Application granted granted Critical
Publication of EP1002599B1 publication Critical patent/EP1002599B1/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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408—Moulds for casting thin slabs

Definitions

  • the invention relates to a mold for the continuous casting of metal with a cooled Broad side and narrow side walls, funnel-shaped in the pouring direction pouring area tapered to the format of the cast strand.
  • the dimensions of the pouring area are essentially determined by the cross section of the strand to be cast, the dimensions of the pouring tube and determined its immersion depth in the melt.
  • the strand shell Due to the funnel-shaped shape of the broad side walls takes place in the casting direction not only a rejuvenation, but also a change in shape of the Strand cross section instead.
  • the strand shell is in transit a funnel mold in contrast to a conventional continuous casting mold with flat walls forced additional deformations, which lead to errors being able to lead.
  • the strand shell becomes additional Deformations imposed. Also, in this case, it is more even Contact between the strand shell and the mold wall is no longer guaranteed. Areas arise with excessively high or low strand shell temperature, which increases the likelihood of errors.
  • the strand shell lifts partially from the mold wall from. The strong rewarming in these areas creates high levels thermal stresses that can lead to errors.
  • EP 0 149 734 describes a mold with a funnel-shaped pouring area, that to the narrow side walls and in the casting direction by triangular Transitional areas is reduced to the format of the cast tape. Thereby there is a trapezoidal outer contour of the pouring area.
  • EP 0 230 886 proposes the contour of the lateral transition surfaces to be rectangular, these surfaces being both flat and curved could be.
  • the outer contour of the pouring area is a rectangle.
  • EP 0 268 910 additionally proposes the broad side walls in the pouring area run essentially parallel to each other in a first height section leave and in a subsequent section on the thickness of the Casting format attributed, the first section to below that at Casting level to be set in the area of the first strand shell formation enough. In this way, the bottom of the casting mirror should still thin strand shell can be guided without deformation.
  • DE 39 07 351 A1 discloses a proposal, the horizontal contour of the inner wall the pouring funnel of a mold by three tangentially touching To form arcs, the radii of which gradually increase in the direction of the strand becoming into the contour of the inner wall of the mold. In this way the deformation of the metal casting strand over the greatest possible length distributed, and constrictions and cracks in the strand shell of the metal casting are avoided. An even distribution of the Shape change of the strand shell in a pouring area shaped in this way thereby achieved that their radii in the strand passage direction with the same or unequal factor increase.
  • the outer contour of such a pouring area is a rectangle. The distance between the lines that are the tangent points connect starting from the upper edge of the mold to the funnel exit, stays unchanged.
  • EP 0 552 501 discloses a mold, the funnel-shaped pouring area of which connected by lateral arcs and at tangent points middle arcs is determined.
  • the radii are the reduction of the tensile and bending stresses of the strand shell the lateral arcs in at least 100 mm from the upper edge of the mold downward extending section formed constant. In this Section decreases the distance between the lines which are the tangent points connect starting from the upper edge of the mold to the funnel exit, while the outer contour of the pouring area remains rectangular remains.
  • Document EP-B-0 419 570 discloses a continuous casting mold with a cavity which extends in the longitudinal direction from an inlet-side end to an outlet-side end of the mold and whose cross-sectional area lying perpendicular to the longitudinal direction has two essentially rectangular side regions which are separated from one another by a central one Areas are separated with a substantially constant width that does not decrease, the central area lengthening in the longitudinal direction of the cavity from its inlet end to form a casting area, with opposing walls of the casting area separating the side areas, are arcuate and the curve radii of the arcuate walls progressively grow over at least part of the longitudinal direction of the casting area.
  • the document DE 44 24 600 A relates to a mold for the continuous casting of thin slabs with an improved surface quality.
  • the mold consists of two cooled broad side walls widened on the pouring side and two cooled Narrow side walls.
  • the ratio between the largest clear width in the bath level area of the mold in the thickness direction and the clear width at the outlet of the casting strand from the mold is limited to a value of 1.3 to 1.5.
  • the ratio of the length of the casting strand contour formed in the bath level area of the mold and the casting strand contour when the rectangular lower one is reached The mold section does not exceed the ratio of the values for the linear Shrinkage of the strand shell between the same levels of the mold, being is taken into account when setting the cone of the narrow side walls.
  • the state of the art can be summarized in that a rectangular outer contour of the funnel area is essential Characteristic of molds with reduced strand shell loading and reduced Mold wear is in the funnel area.
  • the creation of deformation-free Side areas of the funnel can change a variable distance between the lines that delimit the areas of opposite curvature.
  • the object of the invention is a funnel geometry to specify a mold, which is particularly important when forming strand shells of a steel that tends to have a comparatively high shrinkage a clear reduction in the defect of the slab surface is achieved.
  • the invention is based on the experience gained from a large number of test castings based on the fact that when casting from comparatively high shrinkage tend Steel in a mold with a funnel-shaped pouring area, the horizontal Contour through tangential arcs with the same radius is formed, the defects on the slab surface almost exclusively in the middle, the concave horizontal contour area of the Funnels arise. It was concluded that a reduction in the level of errors the strand surface can be achieved when the strand shell load reduced in the middle part of the funnel at the expense of the lateral outer areas becomes.
  • an embodiment of the invention provides that the horizontal Contour of the funnel area through tangentially touching arcs with unchangeable or increasing radius is formed.
  • Another embodiment of the invention provides that the horizontal contour of the funnel area over one or more height sections a trigonometric or has a polynomial course. According to the vertical The inner contour of the funnel area have any course.
  • a continuous casting mold consists of two opposite broad side walls 1, 2 and two arranged laterally between the broad side walls 1, 2 Narrow side walls 3, 4.
  • the broad side walls have one on the Mold upper edge 5 beginning of the curved funnel-shaped pouring area 6 on the narrow sides 3, 4 and in the casting direction on the format of the cast Stranges is reduced.
  • Fig. 2 shows the outer contour of the pouring area 7 - 7 '- 7 "- 7' '' - 7" ", which is designed such that in the upper section B the distance between the lateral Boundary lines 7 and 7 "" is variable. According to the invention in this Area B also the distance between lines 8 and 8 '' ', which are the areas limit opposite curvature, changeable.
  • FIG. 4 Another embodiment of the funnel-shaped pouring area according to the invention shows Fig. 4.
  • the lateral boundary lines 9 and 9 "point over the entire Height A of the pouring area 6 to a curved course, so that the Distance between these boundary lines in all horizons of the pouring area 6 is different.
  • lines 10 and 10 ' also indicate which limit the areas of opposite curvature, one so curved Course on that the distance between them over the entire height A of the pouring area 6 is changeable.
  • FIGS. 5 and 7 Two further examples of the funnel-shaped configuration according to the invention Pouring areas are shown in FIGS. 5 and 7.
  • the distance between the lateral boundary lines 11 and 11 'or 13 and 13' and between the lines 12 'and 12 "delimiting the areas of opposite curvature or 14 and 14 ' is variable over part of the height A of the pouring area.
  • the pouring area tapers in the casting direction so that its width at its outlet is zero.
  • the horizontal inner contour of the broad side plate shown in Fig. 2 is about the entire funnel height A is formed by three tangential arcs, whose radius is the same on every horizon. This is at the top edge Radius 1848.06 mm.
  • the hopper width 7 - 7 "" decreases in the pouring direction, starting from the top edge 5 in a 300 mm long section B linear from 1150 mm to 767.44 mm and remains unchanged until the outlet 7 "of the pouring area 6.
  • Such a configuration of the funnel area makes it possible in section B keep the radius R of the horizontal inner contour of 1848.06 mm unchanged.
  • 3 shows an example of the horizontal inner contour at the upper edge of the mold 5 and on three different horizons I, II and III.
  • the middle of the upper section is formed the funnel-shaped pouring area, where the strand is particularly susceptible to the emergence of surface defects is an area where there are no length changes the horizontal contour when moving from a horizon to an underlying one Horizon take place.
  • the mold section is tapered in the pouring direction, in this case from 45 mm to 19.97 mm in the middle of the mold.
  • the changes in length, which correspond to the taper of the pouring area can be found in the upper mold section B only in the side areas where it is used for the strand shell formation are not critical.
  • the horizontal inner contour of the broad side plate shown in Fig. 4 is over the entire funnel height A is characterized by a sinusoidal curve.
  • the lateral contours 9 and 9 "of the pouring area 6 are arcuate Sections, the tangents of which run vertically at the level of the funnel outlet 9 '.
  • the distance between the lateral boundary lines decreases from 1150 mm at the upper edge of the mold 5 to 750 mm at the funnel outlet 9 '.
  • the distance between lines 10, and 10 ', which areas are opposite Limit curvature decreases from 575 mm to 375 mm.
  • the contour of the upper edge 5 of the broad side plate shown in FIG. 5 is according to Fig. 3 through tangentially touching arcs with a radius of 1848.06 mm formed.
  • FIG. 6 shows the vertical inner contours for those shown in FIG. 5 by way of example Longitudinal sections V, VI, VII, VIII and IX shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)

Claims (7)

  1. Lingotière de coulée continue des métaux avec une busette d'introduction en forme d'entonnoir qui converge suivant la direction de la coulée vers le format du lingot coulé et comporte, sur les grands et les petits côtés, des parois latérales refroidies,
    caractérisée en ce que,
    en vue de créer des zones de déformation moindre, l'écartement entre les lignes de délimitation latérales (7') - (7""), (9) - (9"), (11) - (11') et (13) - (13') de la zone en forme d'entonnoir (6) et l'écartement entre les lignes (8) - (8"'), (9) - (9"), (12') - (12") et (14) - (14') respectivement, qui délimitent les zones courbes de courbure inverse, voire les surfaces planes d'inclinaison différente, sont tous deux réduits dans la direction de la coulée sur un ou plusieurs segments dans le sens de la hauteur (A, B) de la zone en forme d'entonnoir.
  2. Lingotière selon la revendication 1,
    caractérisée en ce que,
    dans la zone en forme d'entonnoir, les contours intérieurs verticaux des parois latérales des grands côtés ne sont pas parallèles.
  3. Lingotière selon la revendication 1,
    caractérisée en ce que
    le contour intérieur horizontal de la zone en forme d'entonnoir est formé, sur un ou plusieurs segments dans le sens de la hauteur (B), par trois arcs de cercle tangents.
  4. Lingotière selon la revendication 3,
    caractérisée en ce que
    le rayon R1 desdits arcs de cercle tangents reste inchangé sur le(s) segment(s) dans le sens de la hauteur (B).
  5. Lingotière selon la revendication 1,
    caractérisée en ce que
    le contour intérieur horizontal de la zone en forme d'entonnoir comporte un sens de parcours trigonométrique ou polynôme sur un ou plusieurs segments dans le sens de la hauteur (B).
  6. Lingotière selon la revendication 1,
    caractérisée en ce que
    le contour intérieur vertical de la zone en forme d'entonnoir est formé, sur un ou plusieurs segments dans le sens de la largeur (V-IX), par des arcs de cercle qui, à leurs extrémités, se confondent avec la zone de la lingotière qui a été diminuée pour correspondre au format du lingot.
  7. Lingotière selon la revendication 6,
    caractérisée en ce que,
    le rayon du contour intérieur vertical R2 reste inchangé sur un ou plusieurs segments dans le sens de la largeur (V-IX).
EP99122381A 1998-11-21 1999-11-10 Lingotière pour la coulée continue de métal Expired - Lifetime EP1002599B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853738 1998-11-21
DE19853738A DE19853738A1 (de) 1998-11-21 1998-11-21 Kokille zum Stranggießen von Metall

Publications (2)

Publication Number Publication Date
EP1002599A1 EP1002599A1 (fr) 2000-05-24
EP1002599B1 true EP1002599B1 (fr) 2004-02-11

Family

ID=7888544

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99122381A Expired - Lifetime EP1002599B1 (fr) 1998-11-21 1999-11-10 Lingotière pour la coulée continue de métal

Country Status (4)

Country Link
EP (1) EP1002599B1 (fr)
AT (1) ATE259266T1 (fr)
DE (2) DE19853738A1 (fr)
ES (1) ES2216414T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT410766B (de) * 2001-09-28 2003-07-25 Voest Alpine Ind Anlagen Durchlaufkokille
DE102021215030A1 (de) 2021-12-23 2023-06-29 Sms Group Gmbh Breitseitenkokillenplatte, Stranggießkokille und Verfahren zum Herstellen einer Breitseitenkokillenplatte

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3400220A1 (de) * 1984-01-05 1985-07-18 SMS Schloemann-Siemag AG, 4000 Düsseldorf Kokille zum stranggiessen von stahlband
DE3601501C3 (de) * 1986-01-20 2000-10-05 Sms Demag Ag Kokille zum Stranggießen von Stahlband
DE3640525C2 (de) * 1986-11-27 1996-02-15 Schloemann Siemag Ag Kokille zum Stranggießen von Stahlband
GB8814331D0 (en) * 1988-06-16 1988-07-20 Davy Distington Ltd Continuous casting of steel
DE3907351C2 (de) * 1989-03-08 1998-09-24 Schloemann Siemag Ag Eingießtrichter einer Kokille
DE4201363C2 (de) * 1992-01-20 2000-08-10 Sms Demag Ag Kokille zum Stranggießen von Stahlband
DE4403050C1 (de) * 1994-01-28 1995-09-28 Mannesmann Ag Stranggießkokille zum Führen von Strängen
DE4424600A1 (de) * 1994-07-13 1996-01-18 Eko Stahl Gmbh Kokille zum Stranggießen von Dünnbrammen

Also Published As

Publication number Publication date
ATE259266T1 (de) 2004-02-15
ES2216414T3 (es) 2004-10-16
DE19853738A1 (de) 2000-05-25
EP1002599A1 (fr) 2000-05-24
DE59908506D1 (de) 2004-03-18

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