US20040244938A1 - Continous casting mould - Google Patents

Continous casting mould Download PDF

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Publication number
US20040244938A1
US20040244938A1 US10/490,538 US49053804A US2004244938A1 US 20040244938 A1 US20040244938 A1 US 20040244938A1 US 49053804 A US49053804 A US 49053804A US 2004244938 A1 US2004244938 A1 US 2004244938A1
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United States
Prior art keywords
mold
open
ended
narrow
curvature
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Abandoned
Application number
US10/490,538
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English (en)
Inventor
Andreas Flick
Gernot Lettmayr
Franz Wimmer
Guoxin Shan
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.)
Primetals Technologies Austria GmbH
Original Assignee
Voest Alpine Industrienlagenbau GmbH
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Application filed by Voest Alpine Industrienlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Assigned to VOEST-ALPINE INDUSTRIEANLAGENBAU, GMBH & CO. reassignment VOEST-ALPINE INDUSTRIEANLAGENBAU, GMBH & CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FLICK, ANDREAS, SHAN, GUOXIN, WIMMER, FRANZ, LITTMAYR, GERNOT
Publication of US20040244938A1 publication Critical patent/US20040244938A1/en
Abandoned 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
    • B22D11/04—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 an open-ended mold for a continuous casting installation, in particular an open-ended steel casting mold, for casting a metal strand with 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, the mutually opposing broad-side walls forming a central widening region, which extends from the mold inlet edge to the mold outlet edge and ends there in a rectangular outlet cross section of the open-ended mold and which goes over in the direction of the mutually opposing narrow-side walls into narrow-side adjusting regions.
  • the known open-ended molds have in the region of the meniscus a spindle-shaped cavity cross section, which is constricted continuously in the direction of the narrow-side walls to the size of the strand to be cast and is made to revert to the size of the desired strand thickness in the strand drawing-out direction or casting direction, either still within the length of the mold or directly in the outlet cross section or in the downstream backup and guiding roll stand of the continuous casting installation.
  • EP-A 1 002 599, DE-A 39 07 351 and EP-A 552 501 already disclose open-ended molds in which the funnel-shaped widening region is formed in sectional planes taken at right angles to the longitudinal axis of the mold by arc portions which replicate the concave-convex-curved spindle form.
  • the funnel-shaped widening region is formed in sectional planes taken at right angles to the longitudinal axis of the mold by arc portions which replicate the concave-convex-curved spindle form.
  • the strand shell comes away from the mold wall, whereby inhomogeneous temperature conditions occur in the strand shell and, as a result, there is uneven strand shell development.
  • EP-A 552 501, EP-A 909 597 and DE-A 39 07 351 disclose for example open-ended molds in which the contour of the funnel-shaped widening region change in the longitudinal direction, i.e. along sectional planes parallel to the longitudinal axis of the mold, abruptly or with a great change in curvature. This usually applies to molds in which the funnel-shaped widening region already ends at a relatively great distance from the mold outlet edge. Apart from the disadvantages already described above of sudden or great changes in radius and curvature of the curves describing the widening region, additional loads on the strand shell are produced by the oscillation of the mold. The locally intensified knocking of the mold on the funnel-shaped taper of the strand brings about additional impairment of the strand shell in this region.
  • the object of the present invention is therefore to avoid the described disadvantages of the known prior art and to propose an open-ended mold with which the contour of the mold cavity is optimized in such a way that coming away of the strand from the mold wall is to a great extent prevented from the meniscus to the mold outlet edge, and consequently homogeneous forming of the strand shell in the mold is ensured.
  • a preferred configuration in the central region of the widening region is obtained if the contour of the mold cavity in the widening region is formed in sectional planes taken at right angles to the longitudinal axis of the mold by curves running symmetrically in relation to the narrow-side walls with a convex-concave profile, which, starting from the center of the mold cavity contour with only a small or no curvature, go over into a region with constantly increasing curvature. This effectively counteracts tendencies of the strand shell to come away in the central region.
  • Critical regions with regard to the coming away of the strand shell from the broad-side wall of the mold are formed by the maximum widening, the transition from the central widening region to the adjoining narrow-side adjusting regions and the regions of the mold cavity that have points of inflection.
  • minimizing of the coming away of the strand shell is achieved on the one hand by the transition from the central widening region and the narrow-side adjusting region laterally adjoining the latter being formed by a straight line which, in a sectional plane taken parallel to the longitudinal axis of the mold and the narrow-side walls, joins the mold inlet edge and the mold outlet edge, on the other hand by the locations of the inflectional tangents in the contour of the mold cavity with sectional planes taken at right angles to the longitudinal axis of the mold forming straight lines between the mold inlet edge and the mold outlet edge which lie in a sectional plane taken parallel to the longitudinal axis of the mold.
  • the straight lines are arranged inclined by the extent of strand shrinkage.
  • the inclination corresponds in its spatial orientation and order of magnitude to the values customary for a taper setting of the narrow sides. This measure is intended to avoid the strand shell having to run through a transition from a parallel wall region into the widening region in the strand drawing-off direction.
  • the contour of the mold cavity in the widening region has in sectional planes taken parallel to the longitudinal axis of the mold and the narrow-side walls a curved, preferably parabolic, profile between the mold inlet edge and the mold outlet edge, in dependence on the solidifying conditions of the metal to be cast. This also applies especially to the regions of the transition from the central widening region to the adjoining narrow-side adjusting regions and the locations of the points of inflection or inflectional tangents, if appropriate with allowance for a shrinkage-dependent inclination.
  • FIGS. 1 a , 1 b , 1 c show a schematic representation of the open-ended mold according to the invention in a plan view (view Z), front view and side view (section A-A) according to one possible embodiment of the invention,
  • FIG. 1 d shows a further embodiment of the open-ended mold according to the invention in side view (analogous to section A-A in FIG. 1 c ),
  • FIG. 2 shows the open-ended mold according to the invention in a longitudinal section with submerged casting nozzle and cast strand
  • FIG. 3 shows the coming-away behavior of the strand from the broad-side wall when there are great changes in curvature in a central widening region of a rectangular shape in a continuous casting mold according to the prior art
  • FIG. 4 shows the coming-away behavior of the strand from the broad-side wall when there are great changes in curvature in a central widening region of a trapezoidal shape in a continuous casting mold according to the prior art
  • FIG. 5 shows the coming-away behavior of the strand from the broad-side wall when there are minimized changes in curvature in a central widening region of a rectangular shape in a continuous casting mold according to the invention
  • FIG. 6 shows a comparison of the contour of the central widening region and the associated curvature profiles in the case of the mold according to the invention and a mold according to the prior art.
  • FIGS. 1 a to 1 c An open-ended mold of the type according to the invention is represented in FIGS. 1 a to 1 c in a schematic representations. It comprises two mutually opposing broad-side walls 1 , 2 and two likewise mutually opposing narrow-side walls 3 , 4 , which can be adjusted between two positions B, B 1 in the sense of a format adjustment. Bounded by the broad-side walls 1 , 2 and the narrow-side walls 3 , 4 , between the mold inlet edges 5 and the mold outlet edges 6 , is the mold cavity 7 of the open-ended mold, in which a cast strand, comprising a strand shell 9 and a liquid core 10 , is formed between a meniscus (liquid metal level) 8 and the mold outlet edge 6 , as illustrated in FIG. 2.
  • the broad-side walls 1 , 2 have a central widening region 11 , which is bounded essentially by the narrowest adjusting region B 1 of the narrow-side walls 3 , 4 and goes over on both sides into the narrow-side adjusting regions 12 , 13 .
  • These narrow-side adjusting regions are formed by mutually plane-parallel wall parts of the broad-side walls 1 , 2 and extend from the mold inlet edge 5 to the mold outlet edge 6 .
  • the broad-side walls it is quite possible for the broad-side walls to form planar surface areas arranged such that they converge in the strand drawing-off direction or the direction of the narrow-side walls in the region of the narrow-side adjusting regions.
  • the central widening region 11 has at the mold inlet edges 5 a cross section which narrows in the form of a spindle to the narrow-side adjusting regions 12 , 13 . It is provided in its central region with a width adequate for receiving a submerged casting nozzle 14 and is reduced toward the narrow-side adjusting regions 12 , 13 to the thickness D of the metal strand to be cast by curves 15 with a curvature profile that is to a great extent free of any sudden changes.
  • These curves 15 comprise for example arcs of a circle 16 , 17 , which are joined in line by clothoids 18 , 19 , 20 , 21 or clothoidal curves and the curvature profile of which runs without any abrupt changes or with abrupt changes minimized.
  • the central widening region 11 is continuously constricted between the mold inlet edge 5 and the mold outlet edge 6 and is reduced at the mold outlet edge 6 to the size of a rectangular outlet cross section 22 , which corresponds to the desired casting cross section.
  • the contour profile of the central widening region 11 between the mold inlet edge 5 and the mold outlet edge 6 is formed, in relation to a sectional plane which is taken parallel to the longitudinal axis 23 of the mold and parallel to the narrow-side walls 3 , 4 , by straight lines 24 a , 24 b , . . . 24 n .
  • This linear configuration of the central widening region in the casting direction ensures freedom from deformation in the vertical strand drawing-off direction.
  • This definition of the sectional plane is based on the assumption that the narrow-side walls 3 , 4 are arranged plane-parallel to one another and there is therefore no taper adjustment.
  • the central widening region 11 can also be constricted between the mold inlet edge 5 and the mold outlet edge 6 by a curve with a parabolic profile 26 . (FIG. 1 d )
  • FIG. 3 illustrates results of numerical investigations on a finite-element basis in a half-section of a broad-side wall between the meniscus and the mold outlet edge by an example of an open-ended mold according to the prior art with a central widening region which is of a rectangular shape in an end-on view and extends in the transverse direction between the line I, which corresponds to the longitudinal axis ( 23 ) of the mold in FIG. 1 a , and the narrow-side adjusting region, and in the longitudinal direction between the meniscus and the line A.
  • the light areas show regions at which the coming away of the strand shell from the broad-side wall is particularly pronounced. In these regions, a great change in curvature occurs in the contour of the central widening region.
  • FIG. 4 shows analogous results with respect to a funnel mold with a V-shaped constriction of the widening region between the meniscus and the mold outlet edge, as is likewise known from the prior art.
  • the structural composition of the representation corresponds to FIG. 3.
  • V-shaped funnel edge line V
  • the associated changes in curvature in the longitudinal direction cause these disturbances of the contact behavior.
  • FIG. 5 shows the results of the numerical investigation on a finite-element basis with reference to an open-ended mold according to the invention.
  • the structural composition of this representation corresponds in turn to that of FIG. 3.
  • FIG. 6 A comparison of the contours of the mold cavity in the widening region in the case of a funnel mold according to the prior art and a mold according to the invention in a sectional plane taken at right angles to the longitudinal axis of the mold is represented in FIG. 6.
  • the contour profile according to the prior art represented by dotted lines, is formed by two arc portions merging one into the other and ends in a straight line which identifies the narrow-side adjusting region.
  • the associated curvature profile jumps at the contact point of the two arc portions (point of inflection 25 ′) from an until then constant negative value to a constant positive value.
  • Occurring here is the massive point of discontinuity in the curvature profile that was described as disadvantageous and contributes significantly to the coming away of the strand shell. Conditions with the same effect occur at the transition from the arc to the straight line at the transition to the narrow-side adjusting region.
  • the curvature jumps at a point of discontinuity back to the value zero.
  • the contour profile according to an embodiment of the invention which, starting from the center of the mold, is formed by a clothoid 18 or clothoidal curve with a constantly increasing curvature, which is adjoined by an arc portion 16 with a constant curvature.
  • This is adjoined by a transitional portion which is formed by two clothoids 19 , 20 or clothoidal curves and in the profile of which the curvature is changed continuously from a negative maximum value to a positive maximum value as it passes through a point of inflection 25 .
  • the avoidance of sudden changes in curvature is provided by this contour profile.
  • curve portions formed to approximate arcs of a circle may also be used.
  • a curve portion formed by a straight line or approximately by a straight line may be provided. All these modifications are within the extent of protection of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Led Devices (AREA)
  • Lubricants (AREA)
US10/490,538 2001-09-28 2002-09-02 Continous casting mould Abandoned US20040244938A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0154101A AT410766B (de) 2001-09-28 2001-09-28 Durchlaufkokille
ATA1541/2001 2001-09-28
PCT/EP2002/009765 WO2003028924A1 (de) 2001-09-28 2002-09-02 Stranggusskokille

Publications (1)

Publication Number Publication Date
US20040244938A1 true US20040244938A1 (en) 2004-12-09

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ID=3688332

Family Applications (1)

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US10/490,538 Abandoned US20040244938A1 (en) 2001-09-28 2002-09-02 Continous casting mould

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)

* Cited by examiner, † Cited by third party
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 (8)

* Cited by examiner, † Cited by third party
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
US4811779A (en) * 1986-11-27 1989-03-14 Sms Schloemann-Siemag Aktiengesellschaft Mold for the continuous casting of steel strip
US5311922A (en) * 1992-01-20 1994-05-17 Sms Schloemann-Siemag Aktiengesellschaft Mold for continuously casting steel strip
US5941298A (en) * 1997-03-17 1999-08-24 Sms Schloemann-Siemag Aktiengesellschaft Optimized shapes of continuous casting molds and immersion outlets for casting slabs of steel
US6186220B1 (en) * 1997-09-27 2001-02-13 Sms Schloemann-Siemag Aktiengesellschaft Funnel geometry of a mold for the continuous casting of metal
US6340048B1 (en) * 1998-07-31 2002-01-22 Kabushiki Kaisha Kobe Seiko Sho. Mold for use in continuous metal casting
US6390176B1 (en) * 1997-12-03 2002-05-21 Sms Schloemann-Siemag Aktiengesellschaft Funnel geometry of a mold for the continuous casting of metal
US6810943B2 (en) * 1997-06-30 2004-11-02 Sms Demag Ag Method and device for producing thin slabs

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT379093B (de) * 1984-02-16 1985-11-11 Voest Alpine Ag Durchlaufkokille fuer eine stranggiessanlage
DE3907351C2 (de) * 1989-03-08 1998-09-24 Schloemann Siemag Ag Eingießtrichter einer Kokille
GB9719318D0 (en) * 1997-09-12 1997-11-12 Kvaerner Clecim Cont Casting Improvements in and relating to casting
DE19853738A1 (de) * 1998-11-21 2000-05-25 Schloemann Siemag Ag Kokille zum Stranggießen von Metall

Patent Citations (8)

* Cited by examiner, † Cited by third party
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
US4811779A (en) * 1986-11-27 1989-03-14 Sms Schloemann-Siemag Aktiengesellschaft Mold for the continuous casting of steel strip
US5311922A (en) * 1992-01-20 1994-05-17 Sms Schloemann-Siemag Aktiengesellschaft Mold for continuously casting steel strip
US5941298A (en) * 1997-03-17 1999-08-24 Sms Schloemann-Siemag Aktiengesellschaft Optimized shapes of continuous casting molds and immersion outlets for casting slabs of steel
US6810943B2 (en) * 1997-06-30 2004-11-02 Sms Demag Ag Method and device for producing thin slabs
US6186220B1 (en) * 1997-09-27 2001-02-13 Sms Schloemann-Siemag Aktiengesellschaft Funnel geometry of a mold for the continuous casting of metal
US6390176B1 (en) * 1997-12-03 2002-05-21 Sms Schloemann-Siemag Aktiengesellschaft Funnel geometry of a mold for the continuous casting of metal
US6340048B1 (en) * 1998-07-31 2002-01-22 Kabushiki Kaisha Kobe Seiko Sho. Mold for use in continuous metal casting

Also Published As

Publication number Publication date
ATE344704T1 (de) 2006-11-15
DE50208661D1 (de) 2006-12-21
WO2003028924A1 (de) 2003-04-10
JP2005503928A (ja) 2005-02-10
EP1441869B1 (de) 2006-11-08
ES2278060T3 (es) 2007-08-01
ATA15412001A (de) 2002-12-15
EP1441869A1 (de) 2004-08-04
AT410766B (de) 2003-07-25

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Owner name: VOEST-ALPINE INDUSTRIEANLAGENBAU, GMBH & CO., AUST

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FLICK, ANDREAS;LITTMAYR, GERNOT;WIMMER, FRANZ;AND OTHERS;REEL/FRAME:015712/0611;SIGNING DATES FROM 20040225 TO 20040226

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION