WO2003028924A1 - Stranggusskokille - Google Patents
Stranggusskokille Download PDFInfo
- Publication number
- WO2003028924A1 WO2003028924A1 PCT/EP2002/009765 EP0209765W WO03028924A1 WO 2003028924 A1 WO2003028924 A1 WO 2003028924A1 EP 0209765 W EP0209765 W EP 0209765W WO 03028924 A1 WO03028924 A1 WO 03028924A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- continuous casting
- casting mold
- side walls
- mold according
- curvature
- Prior art date
Links
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 continuous casting mold for a continuous casting plant, in particular a continuous steel casting mold, for casting a metal strand having a thin slab cross section with a maximum thickness of 150 mm, with a mold cavity formed by cooled broad side walls and narrow side walls, wherein the opposing broad side walls form a central extension region extending itself extends from the Kokilleneingangskante to Kokillenausgangskante and there ends in a rectangular outlet cross-section of the continuous mold and merges in the direction of the opposite narrow side walls in narrow-side adjustment.
- Run-through cokes of this type are referred to in practice as "funnel cooils" and are described with different embodiments of the funnel-shaped extension region in the literature.
- the many embodiments of the original Rossi mold (DE-C 887 990) and the first adjustment mold with a funnel-shaped Extension range (EP-B 149 734) are derived reflect the problems in the strand shell formation and the forming of this strand shell in the spatially curved extension region.
- the known continuous molds in the region of the meniscus on a spindle-shaped mold cavity cross-section which is continuously narrowed in the direction of the narrow side walls to the extent of the strand to be cast and in strand extraction direction or casting either within the mold or directly in the outlet section or in the subsequent support - And guide roller frame of the continuous casting plant is returned to the extent of the desired strand thickness.
- the strand shell lifts off the mold wall, as a result of which inhomogeneous temperature conditions in the strand shell and, as a result, uneven strand shell growth occur. Subsequently, this leads to temperature stresses between adjacent strand zone and increased loads, and possibly to damage the strand shell.
- EP-A 909 597 and DE-A 3907 351 for example, through molds are known, in which the contour of the funnel-shaped extension region in the longitudinal direction, d. H. change along cutting planes parallel to the mold longitudinal axis abruptly or with a large change in curvature. In most cases, this applies to molds whose funnel-shaped extension region already ends at a greater distance from the mold exit edge.
- additional loads on the strand shell result from the mold oscillation.
- the locally reinforced tapping of the mold on the funnel-shaped wedge of the strand causes an additional impairment of the strand shell in this area.
- a continuous mold of the type described above, with an extension region which extends from the Kokilleneingangskante over the entire Kokillenlie and is withdrawn only in Kokillenausgangsquerrough on the rectangular cross-section of the strand to be cast, is already known from DE-C 35 01 422.
- the contour of the widening region is formed in sectional planes laid perpendicular to the longitudinal axis of the mold by circular arcs adjoining each other and likewise has the disadvantages described above.
- the forcibly occurring due to the reshaping of the extension region shortening of the strand circumference length is counteracted by a corresponding employment of the narrow side walls and thus already avoided a strand shell distortion.
- the object of the present invention is therefore to avoid the described disadvantages of the known prior art and to propose a continuous casting mold the contour of the mold cavity is optimized such that lifting of the strand from the mold wall from the meniscus to Kokillenaustrittskante is largely prevented and thus a more homogeneous strand shell formation is ensured in the mold.
- contour of the mold cavity in the extension region is formed in normal to a Kokillenl Kunststoffsachse cutting planes of curves that form at least in some areas clothoids or clothoidal curves within which the curvature jumps are minimized or reduced to zero.
- the avoidance of curvature jumps creates the best conditions for optimal strand shell formation.
- a preferred embodiment in the middle region of the extension region is given when the contour of the mold cavity in the extension region is formed in normal to Kokillenl Kunststoffsachse cutting planes of symmetrical to the narrow side walls curves with convex-concave curve, starting from the center of the mold cavity contour with only a small or no curvature pass into an area with steadily increasing curvature. This effectively counteracts lift-off tendencies of the strand shell in this central area.
- An improvement in the strand shell formation and strand shell guide along the broad side walls adjusts itself when the curvature jumps are minimized in the transition from the central extension region to the narrow side adjustment and at the location of Wendetangenten in the curve, preferably go to zero.
- Critical areas in terms of lifting the strand shell from the Kokillen- broad sidewall form the maximum extension, the transition from the central extension region to the subsequent narrow side adjustment areas and the areas of the mold cavity having inflection points.
- a minimization of the strand bowl lift on the one hand achieved in that the transition from the central extension region and laterally adjoining narrow-side adjustment is formed by a straight line connecting the Kokilleneingangskante and the Kokillenausgangskante in a plane parallel to Kokillenl horrsachse and the narrow side walls cutting plane, on the other hand achieved in that the locations of the wedge tangents in the contour of the mold cavity form straight lines between the mold inlet edge and the mold exit edge at cutting planes laid perpendicular to the longitudinal axis of the mold, which lie in a cutting plane parallel to the mold longitudinal axis.
- the straight lines are inclined in the extent of strand shrinkage.
- the inclination corresponds to the values customary for cone adjustment of the narrow sides. This measure is intended to prevent the strand shell in the strand withdrawal direction from having to pass through a transition from a parallel wall region into the expansion region.
- the contour of the mold cavity in the extension region in cutting planes parallel to the Kokillenl Kunststoffsachse and the narrow side walls between the Kokilleneingangskante and the Kokillenausgangskante as a function of the solidification conditions of the metal to be cast has a curved, preferably parabolic course. This is especially true for the areas of transition from the central extension area to the adjoining narrow-side adjustment areas and the locations of the inflection points or Wendet tangents, possibly taking into account a shrinkage-dependent inclination.
- Fig.ld another embodiment of the continuous mold according to the invention in the cross-section (analogous to section A-A in Fig. 1c),
- FIG. 2 shows the continuous casting mold according to the invention in a longitudinal section with immersion casting tube and cast strand
- 3 shows the stripping behavior of the strand from the broad side wall with large changes in curvature in a rectangular shaped central expansion region in a continuous casting mold according to the prior art
- 4 shows the stripping behavior of the strand from the broad side wall with large changes in curvature in a trapezoidally shaped central expansion region in a continuous casting mold according to the prior art
- Fig. 6 shows a comparison of the contour of the central extension region and the associated curvature curves in the mold according to the invention and a mold according to the prior art.
- a continuous mold of the type according to the invention is shown in a schematic representations. It consists of two opposite broad side walls 1, 2 and two also opposite one another and in the sense of a format adjustment between two positions B, B1 adjustable narrow side walls 3, 4. Of the broad side walls 1, 2 and the narrow side walls 3, 4 is between the mold input edges 5 and the Kokillenausgangskanten 6 of the mold cavity 7 of the continuous mold, in which between a meniscus (G maniscus) 8 and the Kokillenausgangskante 6, a cast strand, consisting of a strand shell 9 and a liquid core 10, is formed, as illustrated in Figure 2.
- the wide side walls 1, 2 have a central extension region 11, which is essentially limited by the narrowest adjustment range B1 of the narrow side walls 3, 4 and merges into the narrow-side adjustment regions 12, 13 on both sides.
- the broad side walls in the region of the narrow-side adjustment in the strand withdrawal direction or in Form converge to the narrow side walls converging arranged flat surfaces.
- the central extension region 11 has a spindle-shaped tapered cross-section to the narrow-side adjustment regions 12, 13 at the mold inlet edges 5. It is equipped in its central region with a sufficient width for receiving a Tauchg tellrohres 14 and to the narrow-side adjustment ranges 12, 13 through curves 15 with largely jump-free curvature to the thickness D of reduced casting metal strand.
- These curves 15 consist for example of circular arcs 16, 17, which are connected in alignment by clothoids 18, 19, 20, 21 or clothoid-like curves and the curvature of which runs without jump or jump minimizing.
- the central extension region 11 is continuously narrowed between Kokilleneingangskante 5 and Kokillenausgangskante 6 and is reduced at the Kokillenausgangskante 6 to the dimension of a rectangular outlet cross-section 22, which corresponds to the desired G automatquerites.
- This linear design of the central extension region in the casting direction ensures freedom of deformation in the vertical strand withdrawal direction.
- Fig. 3 illustrates results of finite element based numerical studies in a half section of a broad side wall between meniscus and mold exit edge using the example of a prior art continuous casting mold having a central expansion area rectangularly formed in the front view, extending transversely between line I , which corresponds to the Kokillenl Kunststoffsachse (23) in Fig. 1a, and the narrow-side adjustment and extends in the longitudinal direction between the meniscus and the line A.
- the bright areas show areas where the lifting of the strand shell from the broad side wall is particularly striking. In these areas, a large change of curvature occurs in the contour of the central extension area. At these points inhomogeneous temperature conditions and reduced strand shell growth can be expected.
- Fig. 4 shows analogous results with respect to a funnel mold having a V-shaped constriction of the extension area between meniscus and mold exit edge, as is also known from the prior art.
- the structural design of the representation corresponds to FIG. 3.
- Also in this Kokillentyp set up large areas with disturbed contact between strand shell and mold wall. The reason lies in the V-shaped funnel edge (line V), which lies obliquely to the casting direction and must pass through the strand / strand shell. The associated bending changes in the longitudinal direction cause these disturbances of the contact behavior.
- FIG. 5 shows the results of the finite element-based numerical investigation using a continuous casting mold according to the invention.
- the structural design of this representation corresponds in turn to that of FIG. 3. Due to the inventive optimization of the contour of the mold cavity of the mold bright areas with disturbed contact between strand shell and broad side wall are only in the immediate vicinity of Kokillenaustrittskante where no negative effects on the strand shell formation more occur.
- FIG. 6 A comparison of the contours of the mold cavity in the extension region in a funnel mold according to the prior art and a mold according to the invention in a normal to the Kokillenl Kunststoffsachse cutting plane is shown in Fig. 6.
- the contour over the mold width is shown starting from the center of the mold (mold longitudinal axis), and the lower half of the image shows the associated curve over the mold width.
- the contour curve according to the prior art shown by dotted lines is formed by two arc sections merging into one another and ends in a straight line which identifies the narrow-side adjustment region.
- the associated curve shown with a dotted line jumps at the point of contact of the two circular arc section (inflection point 25 ' ) from a negative value to a constant value to a constant positive value.
- the disadvantageous described massive discontinuity in the curvature which contributes significantly to the lifting of the strand shell.
- Equivalent conditions are present at the transition from the circular arc to the straight line at the transition to the narrow-side adjustment range.
- the curvature jumps back to zero in a point of discontinuity.
- a continuous line of the contour curve is shown according to an embodiment of the invention, starting from the Kokillenmitte of a Clothoid 18 or clothoid-like curve is formed with a constantly increasing curvature, which is followed by a circular arc section 16 with constant curvature. This is followed by a transition section formed by two clothoids 19, 20 or clothoid-like curves, in the course of which the curvature is continuously changed from a negative maximum value when passing through an inflection point 25 to a positive maximum value.
- a circular arc section 17 connects with a positive curvature value, which is subsequently converted to the curvature value zero of a straight line with a clothoid 21 or clothoid-like transition curve.
- the avoidance of curvature jumps is given by this contour.
- approximately arc-shaped curved sections can also be used.
- a curve section formed by a straight line or approximately by a straight line can be provided. All of these modifications are within the scope of the invention.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003532230A JP2005503928A (ja) | 2001-09-28 | 2002-09-02 | 端部開放鋳型 |
EP02779287A EP1441869B1 (de) | 2001-09-28 | 2002-09-02 | Stranggusskokille |
US10/490,538 US20040244938A1 (en) | 2001-09-28 | 2002-09-02 | Continous casting mould |
DE50208661T DE50208661D1 (de) | 2001-09-28 | 2002-09-02 | Stranggusskokille |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0154101A AT410766B (de) | 2001-09-28 | 2001-09-28 | Durchlaufkokille |
ATA1541/2001 | 2001-09-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003028924A1 true WO2003028924A1 (de) | 2003-04-10 |
Family
ID=3688332
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/009765 WO2003028924A1 (de) | 2001-09-28 | 2002-09-02 | Stranggusskokille |
Country Status (7)
Country | Link |
---|---|
US (1) | US20040244938A1 (de) |
EP (1) | EP1441869B1 (de) |
JP (1) | JP2005503928A (de) |
AT (2) | AT410766B (de) |
DE (1) | DE50208661D1 (de) |
ES (1) | ES2278060T3 (de) |
WO (1) | WO2003028924A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1292858C (zh) * | 2004-01-17 | 2007-01-03 | 宝山钢铁股份有限公司 | 一种水冷的金属连铸结晶器 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3501422A1 (de) * | 1984-02-16 | 1985-08-22 | Voest-Alpine Ag, Linz | Durchlaufkokille fuer eine stranggiessanlage |
DE3907351A1 (de) * | 1989-03-08 | 1990-09-13 | Schloemann Siemag Ag | Kokille mit eingiesstrichter |
EP0552501A2 (de) * | 1992-01-20 | 1993-07-28 | Sms Schloemann-Siemag Aktiengesellschaft | Kokille zum Stranggiessen von Stahlband |
GB2329141A (en) * | 1997-09-12 | 1999-03-17 | Kvaerner Metals Cont Casting | Continuous casting |
EP1002599A1 (de) * | 1998-11-21 | 2000-05-24 | SMS Demag AG | Kokille zum Stranggiessen von Metall |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2564723A (en) * | 1947-11-06 | 1951-08-21 | Continuous Metalcast Corp | Apparatus for the continuous casting of metal slab |
DE3640525C2 (de) * | 1986-11-27 | 1996-02-15 | Schloemann Siemag Ag | Kokille zum Stranggießen von Stahlband |
DE19710791C2 (de) * | 1997-03-17 | 2000-01-20 | Schloemann Siemag Ag | Zueinander optimierte Formen der Stranggießkokille und des Tauchausgusses zum Gießen von Brammen aus Stahl |
DE19728957A1 (de) * | 1997-06-30 | 1999-01-07 | Mannesmann Ag | Verfahren und Vorrichtung zum Erzeugen von Dünnbrammen |
DE19742795A1 (de) * | 1997-09-27 | 1999-04-01 | Schloemann Siemag Ag | Trichtergeometrie einer Kokille zum Stranggießen von Metall |
DE19753537A1 (de) * | 1997-12-03 | 1999-06-10 | Schloemann Siemag Ag | Trichtergeometrie einer Kokille zum Stranggießen von Metall |
JP4164163B2 (ja) * | 1998-07-31 | 2008-10-08 | 株式会社神戸製鋼所 | 金属の連続鋳造用鋳型 |
-
2001
- 2001-09-28 AT AT0154101A patent/AT410766B/de not_active IP Right Cessation
-
2002
- 2002-09-02 DE DE50208661T patent/DE50208661D1/de not_active Expired - Lifetime
- 2002-09-02 AT AT02779287T patent/ATE344704T1/de not_active IP Right Cessation
- 2002-09-02 EP EP02779287A patent/EP1441869B1/de not_active Revoked
- 2002-09-02 US US10/490,538 patent/US20040244938A1/en not_active Abandoned
- 2002-09-02 JP JP2003532230A patent/JP2005503928A/ja not_active Withdrawn
- 2002-09-02 WO PCT/EP2002/009765 patent/WO2003028924A1/de active IP Right Grant
- 2002-09-02 ES ES02779287T patent/ES2278060T3/es not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3501422A1 (de) * | 1984-02-16 | 1985-08-22 | Voest-Alpine Ag, Linz | Durchlaufkokille fuer eine stranggiessanlage |
DE3907351A1 (de) * | 1989-03-08 | 1990-09-13 | Schloemann Siemag Ag | Kokille mit eingiesstrichter |
EP0552501A2 (de) * | 1992-01-20 | 1993-07-28 | Sms Schloemann-Siemag Aktiengesellschaft | Kokille zum Stranggiessen von Stahlband |
GB2329141A (en) * | 1997-09-12 | 1999-03-17 | Kvaerner Metals Cont Casting | Continuous casting |
EP1002599A1 (de) * | 1998-11-21 | 2000-05-24 | SMS Demag AG | Kokille zum Stranggiessen von Metall |
Also Published As
Publication number | Publication date |
---|---|
ATE344704T1 (de) | 2006-11-15 |
US20040244938A1 (en) | 2004-12-09 |
ES2278060T3 (es) | 2007-08-01 |
EP1441869B1 (de) | 2006-11-08 |
JP2005503928A (ja) | 2005-02-10 |
DE50208661D1 (de) | 2006-12-21 |
EP1441869A1 (de) | 2004-08-04 |
AT410766B (de) | 2003-07-25 |
ATA15412001A (de) | 2002-12-15 |
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