US3429365A - Continuous slab casting mold - Google Patents

Continuous slab casting mold Download PDF

Info

Publication number
US3429365A
US3429365A US516932A US3429365DA US3429365A US 3429365 A US3429365 A US 3429365A US 516932 A US516932 A US 516932A US 3429365D A US3429365D A US 3429365DA US 3429365 A US3429365 A US 3429365A
Authority
US
United States
Prior art keywords
mold
casting
wall
skin
oscillating
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
US516932A
Other languages
English (en)
Inventor
Hans Schrewe
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Application granted granted Critical
Publication of US3429365A publication Critical patent/US3429365A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting

Definitions

  • the invention relates to the continuous casting in liquid cooled molds, of slabs of high melting point, and to the molds for casting these slabs; and relates more particularly to casting methods and molds Where the mold oscillates throughout a stroke.
  • Oscillating molds for continuous casting generally are known, reference being had, for instance, to the article, The Continuous Casting of Steel, by Leonard V. Gallagher and Bruce S. Old, Scientific American (December 1963), pp. 75-88.
  • Austrian Patent No. 181,379 teaches to form a liquid cooled mold in such a manner that its wall is thinnest at the zone of beginning solidification, thus in the upper one third of the mold, and increases in thickness, either uniformly or stepwise, towards the exit opening of the mold.
  • German Patent No. 900,861 teaches to subdivide the mold into two zones of different cooling intensity.
  • This German patent teaches, in contrast to the aforesaid Austrian patents, to provide the upper mold part with a material of reduced heat conductivity and the lower part of the mold with a material of increased heat conductivity.
  • the German patent furthermore proposes either to increase the wall thickness in the upper part of the mold or to apply to that upper part a cooling liquid of higher temperature.
  • a slab, for instance of iron or steel, descending in the mold cavity of a mold of the prior art will have a thin solidified skin, while the remainder of the slab will still be liquid. Not far below the molten metal level there will form a shrink space between the skin of the casting and the mold wall. The shrinking occurs because the mold wall is liquid cooled and thereby rapidly conducts heat away from the casting exterior. This causes the occurrence of the shrink space between the skin and the mold interior.
  • the liquid interior will reheat the skin; the skin, on the other hand, is isolated by the shrink space from the cool mold and therefore will, under the heat transfer from the hot liquid interior, be heated and expand until it again makes contact with the mold. This imparts to the skin a corrugation or ripple which which ultimately may lead to breaks in the skin or other injuries to the casting exterior.
  • the invention is based on the recognition of the importance of controlling the heat transfer thereby to control, in turn, the shrinking to avoid the aforesaid repeated contraction and expansion of the slab as it passes through the mold cavity.
  • FIG. 1 is a fragmentary vertical sectional view of portions of a continuous casting mold in accordance with the prior art
  • FIG. 2 is a fragmentary vertical sectional view, similar to FIG. 1, but showing an embodiment in accordance with the instant invention.
  • FIG. 3 is a fragmentary vertical sectional view, similar to FIG. 2, but embodying a modification.
  • FIG. 1 there is shown a prior art mold which is liquid cooled (the details of the liquid cooling arrangements having been omitted).
  • the mold 1 is of the oscillating type though the well known details of the oscillating mechanism have been omitted for the sake of clarity and simplicity.
  • the wall of the mold 1 is of uniform thickness.
  • the casting that descends in the mold 1 is solidified throughout its thin skin 2; the much larger remaining interior 3 being still liquid.
  • the molten metal level is designated 4, 4' and 4" showing the upper and lower positions of the range of the metal level 4 due to the oscillating strokes.
  • shrink space 5 occurs due to the cooling effect of the mold wall making contact with the casting.
  • the intervening contact between the skin 2 and the mold wall 1 is due to the subsequent expansion under the influence of the internal heat of the liquid core 3.
  • the contact with the mold wall 1 again brings about a shrinking of the skin 2, creating the shrink space 5a.
  • the same sequence of events brings about a renewed contact and shrinking, the latter at the shrink space 5b.
  • This continual shrinking and expanding is deterimental to the slab that is formed of a metal, such as iron or steel, of a high melting point, and the liquid core 3 of which extends through the mold.
  • the wall 6 of the mold is of non-uniform thickness. For a portion of its length, the mold wall 6 is uniform, while near the range 4'-4 of the molten metal level 4, the wall of the mold has a portion 7 of increased thickness; the portion 7 of increased thickness has an increased heat resistance.
  • This increase in thickness of the portion 7 may either be provided by merely making the wall itself thicker, or may be provided by adding to the wall a layer by welding, or by spraying, by galvanizing, or by other well known suitable means, adding a different material having a higher heat resistance.
  • the mold walls of a slab comprise two opposite wide walls and two opposite narrow walls therebetween.
  • Conventional oscillating means 12 are provided for oscillating the mold 1.
  • the narrow walls may be made uniformly, relegating the control to the wide mold walls.
  • the wide mold walls are so constructed, for instance as shown in, FIG. 2, that throughout from about /s to about /2 of the length of the mold they have a higher heat resistance than throughout the remainder of the mold.
  • the zone of increased heat resistance commences, as seen from the upper mold end, about at the plane 4' of the upper position of the molten metal level of the stroke of the oscillating mold.
  • the increased heat resistance of the zone should at least be 1 /2 times that of the heat resistance of the remainder of the mold wall above and below the aforesaid zone.
  • the skin 2 as clearly shown in FIG. 2, will be uniformly spaced at 8 from the mold wall due to shrinking, thereby avoiding the corrugations in the casting of FIG. 1.
  • the length of the thickened portion 7 may, depending on the casting speed, extend from about 70 to about 350 mm., with the greater height assigned to the larger casting speed.
  • the arrangement described herein and shown in FIG. 2 brings about that the solidified skin 2 transmits within the zone of the portion 7 to the mold wall the same amount of heat as in the portion 6 of reduced wall thickness below the thicker portion 7.
  • This uniform heat transfer avoids the occurrence of non-uniform stresses in the skin 2.
  • the shrink space 8 is built gradually, and is small, and the heat transfer from the casting to the mold wall is substantially the same in the lower region as in the upper.
  • This arrangement yields slabs that are free from skin injuries.
  • the mold wall 9 is recessed near the aforesaid range 4'-4", and a material 10 of higher heat resistance fills said recess. It does not make any appreciable difference whether the wide walls of the mold are made of a uniform material or the internal sides facing the casting are provided with an abrasion resistant lining. In FIG. 3, such a lining is shown at 11, and may consist of chromium, or molybdenum, or the like.
  • the instant invention therefore provides to put the various measures in tuned relationship. For instance, the invention proposes to synchronize the downstroke of the mold with the withdrawal speed of the slab in the mold, or that the lead of the mold relative to the casting is not more than 2 to l.
  • the instant invention furthermore provides for influencing the heat transmission from the casting in connection with the instant mold in such a manner, so as for a predetermined steel quality to decrease the stroke where the heat transmission is too small and, conversely, to increase the stroke of oscillation where the heat transmission is too large.
  • the length of the oscillating stroke of the mold and the magnitude of the heat damrning are thus mutually adjustable.
  • a mold for use in the continuous casting of a slab of metal having a high melting point and including a liquid core that extends for a relatively long distance in the casting, such as iron or steel, said mold being liquid cooled and oscillating, means operable for oscillating the mold throughout a certain stroke, said mold having 0pposite wide and narrow side walls defining between an open top and an open bottom a mold cavity having a certain length, said wide mold walls having each throughout at least a portion and increased heat resistance within the range of said oscillating stroke of the molten casting metal bath, whereby the shrinking of the casting away from said wide walls during the passage through the mold will proceed substantially uniformly throughout its breadth and the transfer of heat from the casting skin to the mold wall will thereby be substantially uniform throughout said length of said mold cavity.
  • a mold as claimed in claim 1, said portion of increased heat resistance being formed by an increase in the wall thickness commencing below the mold top.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US516932A 1964-12-28 1965-12-28 Continuous slab casting mold Expired - Lifetime US3429365A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM0063631 1964-12-28

Publications (1)

Publication Number Publication Date
US3429365A true US3429365A (en) 1969-02-25

Family

ID=7310860

Family Applications (1)

Application Number Title Priority Date Filing Date
US516932A Expired - Lifetime US3429365A (en) 1964-12-28 1965-12-28 Continuous slab casting mold

Country Status (6)

Country Link
US (1) US3429365A (enrdf_load_stackoverflow)
AT (1) AT269392B (enrdf_load_stackoverflow)
BE (1) BE674166A (enrdf_load_stackoverflow)
DE (1) DE1458168B1 (enrdf_load_stackoverflow)
GB (1) GB1135229A (enrdf_load_stackoverflow)
NL (1) NL6515045A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990498A (en) * 1974-12-16 1976-11-09 Metallurgie Hoboken-Overpelt Method of continuous casting
US4037646A (en) * 1975-06-13 1977-07-26 Sumitomo Metal Industries, Ltd. Molds for continuously casting steel
US4211270A (en) * 1978-07-28 1980-07-08 Kennecott Copper Corporation Method for continuous casting of metallic strands at exceptionally high speeds
US4736789A (en) * 1978-07-28 1988-04-12 Kennecott Corporation Apparatus and method for continuous casting of metallic strands at exceptionally high speeds using an oscillating mold assembly
US20090301136A1 (en) * 2008-06-06 2009-12-10 Christopher Mini Component based glass casting system and method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH617608A5 (enrdf_load_stackoverflow) * 1977-04-06 1980-06-13 Concast Ag
AT360189B (de) * 1978-04-03 1980-12-29 Voest Alpine Ag Verfahren zum kuehlen einer oszillierenden stahl -stranggiesskokille
DE19852473C5 (de) * 1998-11-13 2005-10-06 Sms Demag Ag Kokillenplatte einer Stranggießanlage
DE19953905A1 (de) * 1999-11-10 2001-05-17 Sms Demag Ag Verfahren und Vorrichtung zur Verminderung der Wärmeabfuhr einer Stranggußkokille
DE102005023745B4 (de) 2005-03-10 2022-02-10 Sms Group Gmbh Verfahren zum Herstellen einer Stranggiesskokille und Stranggiesskokille

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2169893A (en) * 1937-11-01 1939-08-15 Chase Brass & Copper Co Cooling means for continuous casting apparatus
US2242350A (en) * 1938-10-06 1941-05-20 Continuous Casting Corp Continuous casting of metal shapes
US2496235A (en) * 1947-11-06 1950-01-31 Rossi Irving Method for the continuous casting of metal slabs
GB709632A (en) * 1950-11-23 1954-06-02 Mond Nickel Co Ltd Improvements relating to the heat-treatment of metals and alloys
US2983972A (en) * 1960-11-17 1961-05-16 Reynolds Metals Co Metal casting system
CH375106A (de) * 1958-06-06 1964-02-15 Beteiligungs & Patentverw Gmbh Vorrichtung zum vertikalen Giessen von Metallsträngen und Verfahren zum Betrieb derselben
US3129474A (en) * 1961-01-03 1964-04-21 Olsson Erik Allan Apparatus in continuous casting machines having a reciprocating mold
US3279000A (en) * 1963-12-30 1966-10-18 Southwire Co Apparatus for continuous casting of metal

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE900861C (de) * 1937-06-09 1954-01-04 E H Siegfried Junghans Dr Ing Verfahren zum Giessen von Metallen
FR994138A (fr) * 1944-12-30 1951-11-12 Procédé de coulée continue des métaux et appareil permettant sa mise en oeuvre
AT181379B (de) * 1950-03-06 1955-03-10 Boehler & Co Ag Geb Flüssigkeitsgekühlte Kokille zum Stranggießen, insbesondere von hochschmelzenden Metallen
AT176314B (de) * 1951-03-09 1953-10-10 Boehler & Co Ag Geb Stranggußkokille

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2169893A (en) * 1937-11-01 1939-08-15 Chase Brass & Copper Co Cooling means for continuous casting apparatus
US2242350A (en) * 1938-10-06 1941-05-20 Continuous Casting Corp Continuous casting of metal shapes
US2496235A (en) * 1947-11-06 1950-01-31 Rossi Irving Method for the continuous casting of metal slabs
GB709632A (en) * 1950-11-23 1954-06-02 Mond Nickel Co Ltd Improvements relating to the heat-treatment of metals and alloys
CH375106A (de) * 1958-06-06 1964-02-15 Beteiligungs & Patentverw Gmbh Vorrichtung zum vertikalen Giessen von Metallsträngen und Verfahren zum Betrieb derselben
US2983972A (en) * 1960-11-17 1961-05-16 Reynolds Metals Co Metal casting system
US3129474A (en) * 1961-01-03 1964-04-21 Olsson Erik Allan Apparatus in continuous casting machines having a reciprocating mold
US3279000A (en) * 1963-12-30 1966-10-18 Southwire Co Apparatus for continuous casting of metal

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990498A (en) * 1974-12-16 1976-11-09 Metallurgie Hoboken-Overpelt Method of continuous casting
US4037646A (en) * 1975-06-13 1977-07-26 Sumitomo Metal Industries, Ltd. Molds for continuously casting steel
US4211270A (en) * 1978-07-28 1980-07-08 Kennecott Copper Corporation Method for continuous casting of metallic strands at exceptionally high speeds
US4736789A (en) * 1978-07-28 1988-04-12 Kennecott Corporation Apparatus and method for continuous casting of metallic strands at exceptionally high speeds using an oscillating mold assembly
US20090301136A1 (en) * 2008-06-06 2009-12-10 Christopher Mini Component based glass casting system and method
US8739572B2 (en) * 2008-06-06 2014-06-03 Christopher Mini Component based glass casting system and method

Also Published As

Publication number Publication date
GB1135229A (en) 1968-12-04
BE674166A (enrdf_load_stackoverflow) 1966-04-15
NL6515045A (enrdf_load_stackoverflow) 1966-06-29
AT269392B (de) 1969-03-10
DE1458168B1 (de) 1971-05-27

Similar Documents

Publication Publication Date Title
US3429365A (en) Continuous slab casting mold
CA1180531A (en) Electromagnetic thin strip casting apparatus and process
US2770022A (en) Method of continuously casting molten metal
JPH06503757A (ja) スラブ形状で溶鋼から連鋳材を連続鋳造するための液冷される定盤金型
US20050115695A1 (en) Adjustment of heat transfer in continuous casting moulds in particular in the region of the meniscus
ITMI991695A1 (it) Lingotteria per uso nella colata continua di metallo
US3612158A (en) Continuous casting mold having multiple inserts through the casting surface wall
ES419282A1 (es) Procedimiento y dispositivo para la colada de acero en el proceso de colada continua.
US3460609A (en) Nozzle for supplying melt to a mould in a continuous casting machine
US3393727A (en) Continuous casting machine having billet shape maintaining rollers
Park et al. Analysis of thermo-mechanical behavior in billet casting
US20050034838A1 (en) Liquid-cooled permanent mold
US3752215A (en) Continuous casting apparatus for shaped metal bodies
IE913086A1 (en) Installation for continuous casting between rolls
JP2000218345A (ja) 金属を連続鋳造するための漏斗状の鋳込み領域を備えている鋳型の鋳型板
US3346037A (en) Grooved continuous casting mold for slabs
US5299627A (en) Continuous casting method
KR960040509A (ko) 강재의 연속 주조 방법 및 장치
JPS609553A (ja) 絞り込み式連続鋳造機
JPH02284744A (ja) 複式プレート型ストリップ鋳造装置によるストリップ鋳造方法とその装置
SU550225A1 (ru) Кристаллизатор машин непрерывного лить роторного типа
EP0265174A3 (en) Continuous casting molds
JPS6243783B2 (enrdf_load_stackoverflow)
SU1655646A1 (ru) Биметаллический формообразующий инструмент
RU2016696C1 (ru) Металлическая литейная форма