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WO1996035532A1 - Moule - Google Patents

Moule Download PDF

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Publication number
WO1996035532A1
WO1996035532A1 PCT/SE1996/000597 SE9600597W WO9635532A1 WO 1996035532 A1 WO1996035532 A1 WO 1996035532A1 SE 9600597 W SE9600597 W SE 9600597W WO 9635532 A1 WO9635532 A1 WO 9635532A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
cross
section
cavity
mould cavity
Prior art date
Application number
PCT/SE1996/000597
Other languages
English (en)
Inventor
Staffan Hertzman
Bengt Brolund
Original Assignee
Institutet För Metallforskning
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 Institutet För Metallforskning filed Critical Institutet För Metallforskning
Priority to AU61424/96A priority Critical patent/AU6142496A/en
Publication of WO1996035532A1 publication Critical patent/WO1996035532A1/fr

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

Definitions

  • the invention relates to a mould for continuous castin of metals, preferably steel, according to claim 1. Since the beginning of continuous casting with through flow moulds, professional circles have dealt with problems relating to the creation of air gaps between the strand shell and the mould wall below the surface of the molten metal. The air gap is created when the strand shell gradually undergoes a chemical shrinkage during the passage through the mould. The generally applied attempt to solve this problem is to make the mould conical. Of course, this gap formation deteriorates the heat transfer between the mould and the strand shell considerably and causes an uneven cooling of the strand, which results in deficiencies in the billet, such as rhombic shape, cracks, structural defects, etc.
  • US-A-4 207 941 describes a mould for the continuous casting of steel strands with polygonal, in particular square cross-sections.
  • the cross-section of the mould cavity that is open at both sides, is at the inlet side a square with corner fillets and at the outlet side an irregular dodecagon.
  • a jamming of the strand may easil arise, which may lead to a tearing up of the strand and a break through.
  • a dodecagon is moulded instead of a square. I is particularly difficult to dimension such moulds for differen
  • CONFIRMATION COPY moulding speeds during a continuous moulding which is necessary at long sequential mouldings with many changes of ladles.
  • DE-A-3 907 351 a mould for continuous casting of a bloom is described.
  • the two longitudinal sides are provided with bulges at the inlet side of the mould, which are continuously retrograded along a part height of the mould.
  • the cross-section of the mould cavity is right- angled and provided with the desired bloom cross-section.
  • the only purpose of the two bulges facing each other is to provide sufficient place for a moulding pipe. There are no bulges on the two narrow sides and also no shaping of the strand shell by means of the mould walls.
  • AT-B-379 093 describes a mould for the continuous casting of a bloom.
  • the circumference line of the cross-section of the mould cavity at the inlet side can be divided into four circumference sections.
  • At two circumference sections at the inlet side, which simultaneously form the longitudinal sides of the bloom section, are provided cross-sectional enlargements with the shape of protruding bulges in relation with the same cross-section at the outlet side of the strand.
  • the measure of the bulge which in this case corresponds to the arch height, diminishes continuously in the moving direction of the strand and is nil at the exit of the mould.
  • the construction shall also make possible differences in the moulding rate during the process of casting.
  • EP-A-498 296 has only partly managed to fulfil the posed problems.
  • the reduction of the cross-sectional area has sometimes turned out to be too big, which has caused problems of jamming of the cast strand and of an increased mould wear.
  • the chosen casting rate has turned out to be too high for this mould. It has been constructed in first hand for high rates, not for freedom from cracks and a generally faultless casting. However, it does not fully compensate for corner shrinkage, wherefore the corner design leaves more to be desired.
  • the strand binds or "pinches" at lower casting rates.
  • a primary object of the present invention is to compensate for the corner shrinkage of the strand, both at higher and lower casting rates.
  • a further object of the present invention is to simplify the design of the mould as much as possible.
  • Still another object of the present invention is to obtain an optimal contact between the strand and the mould wall along the whole length of the mould.
  • a further object of the present invention is to compensate for the thermal shrinkage that takes place between the inlet and outlet of the mould.
  • Figure 1 shows an outline drawing of how a mould according to the invention shall be designed.
  • Figure 2 shows a top view of an embodiment of the mou according to the invention.
  • Figure 3 shows a top view of another embodiment according to the invention.
  • Figure 4 shows a top view of still another embodiment according to the invention.
  • Figure 5 shows an outline diagram of how a solidification course may be monitored.
  • a mould 1 is generally shown for the continuous casting of metals, preferably steel, into substantially rectangular or square cross-sections.
  • the mould usually made of copper or a copper-based alloy.
  • Reference numeral 2 designates the inlet side of the mould while 3 designates its outlet side. Between inlet and outlet side is t mould cavity 13.
  • the mould is suitably made of one sole piece which suitably is straight, although bowed moulds and block or plate moulds are also feasible.
  • An essential feature of the present invention is that the corner angles ⁇ decrease downwards in a determined way, in order to obtain the advantages that are characteristic for the invention relative to a minimized formation of cracks, an increased casting rate and an optimized heat transfer between strand and mould.
  • an alteration of ⁇ shall take place from between 90-98° at the to to between 90-92° at the bottom. If the total length of the th mould is subdivided into twelve equally long segments accordin to fig 1, then upto half of the angle alteration shall occur i segments 0 and 1". Another 25% of the angle variation should ta place in segments 2 to 4, inclusive. The remaining angle chang should occur down to the mould bottom or outlet side 3, i.e. i the segments 5 to 11, inclusive. As to its amount, the angle al ⁇ teration should be between 2 and 8°, preferably between 2 and 4°.
  • the corner angle diminution according to the invention may take place in a number of ways according to fig 2, 3 and 4.
  • the outermost line is the inlet opening 2 and the innermost line the outlet opening 3.
  • Lines 4, 5 and 6 illustrate the inner wall of the mould at different levels in the mould.
  • line 4 relates to the cross-sectional contour at a height corresponding about to the limit between segments 0 and 1, line 5 to the cross-section somewhere within segment 2 and line 6 the cross-section somewhere within the segment 6.
  • the walls may be arched like in EP-A-498 296, but they may also be shaped according to a simplified embodiment as in fig 2 in straight portions, which simplifies their production quite considerably.
  • the main issue is that all four corner angles ⁇ decrease gradually according to the invention.
  • the two angles ⁇ ⁇ adjacent the planar mould wall should be substantially equally large and vary according to the same sequence as the two corner angles ⁇ . This is achieved by letting the two bulging walls 7,7' bulge unsymmetrically, i.e. the chordal height is basically twice as large at a certain distance above the middle line m than at the same distance below said middle line. At the two corner angles ⁇ , basically half the angle variation is obtained by the bulging of the wall 8.
  • Fig 4 shows a mould with two opposed, substantially planar and nearly vertical walls 9,9', depending upon the choic of conicity, and two intermediate, opposed, bulging walls 10,10'. Hence, in this case, the angle variation of angle ⁇ in all four corners according to the invention is achieved by only varying the bulgings of two walls.
  • the bulging of the walls vertically according to the invention is not uniform with a substantially constant conicity, but differentiated , with a varying conicity.
  • the mould has been "tailor-made" relative to the shrinkage gradient of the solidifying shell.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Valve Housings (AREA)

Abstract

L'invention concerne un moule destiné au moulage de métal, de préférence d'acier, en barres de section transversale pratiquement quadrangulaire. Ce moule présente, entre un côté entrée (2) et un côté sortie (3), une cavité de moule (13) ouverte aux deux extrémités et qui comporte au moins deux parties périphériques, du côté entrée (2), le long de la périphérie de la section transversale de la cavité du moule, entre les coins de la cavité du moule. Chacune de ces parties périphériques délimite un élargissement de la section transversale de la cavité de moule (13) par rapport à la même section transversale périphérique de la section transversale de la cavité de moule du côté sortie (3), les élargissements de la section transversale diminuant dans la direction d'alimentation de la barre. Tous les angles de coin (Ζ) passent d'une valeur élevée du côté entrée (2) du moule, à une valeur faible du côté sortie (3) du moule, jusqu'à la moitié de la variation angulaire ayant lieu dans les deux douzièmes supérieurs de la longueur totale du moule. Cette conception permet d'obtenir une amélioration du contact et du support de l'enveloppe de la barre et une réduction importante des fissures aux coins.
PCT/SE1996/000597 1995-05-09 1996-05-07 Moule WO1996035532A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU61424/96A AU6142496A (en) 1995-05-09 1996-05-07 Mould

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9501708A SE9501708L (sv) 1995-05-09 1995-05-09 Kokill
SE9501708-3 1995-05-09

Publications (1)

Publication Number Publication Date
WO1996035532A1 true WO1996035532A1 (fr) 1996-11-14

Family

ID=20398239

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000597 WO1996035532A1 (fr) 1995-05-09 1996-05-07 Moule

Country Status (3)

Country Link
AU (1) AU6142496A (fr)
SE (1) SE9501708L (fr)
WO (1) WO1996035532A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0875312A1 (fr) * 1997-05-02 1998-11-04 Kvaerner Metals Continuous Casting Limited Améliorations liées à et concernant la coulée
GB2329141A (en) * 1997-09-12 1999-03-17 Kvaerner Metals Cont Casting Continuous casting
EP0958871A1 (fr) * 1998-05-18 1999-11-24 Concast Standard Ag Lingotière pour la coulée continue des barres substantiellement polygonale
ES2152132A1 (es) * 1997-07-31 2001-01-16 Sidenor Investigacion Y Desarr "lingotera perfeccionada y lingote obtenido con la misma".
DE102012207786B4 (de) 2012-05-10 2025-01-02 Sms Group Gmbh Stranggießkokille

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207941A (en) * 1975-06-16 1980-06-17 Shrum Lorne R Method of continuous casting of metal in a tapered mold and mold per se
DE3907351A1 (de) * 1989-03-08 1990-09-13 Schloemann Siemag Ag Kokille mit eingiesstrichter
EP0498296A2 (fr) * 1991-02-06 1992-08-12 Concast Standard Ag Coquille pour la coulée continue de métaux notamment d'acier
DE4403050C1 (de) * 1994-01-28 1995-09-28 Mannesmann Ag Stranggießkokille zum Führen von Strängen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207941A (en) * 1975-06-16 1980-06-17 Shrum Lorne R Method of continuous casting of metal in a tapered mold and mold per se
DE3907351A1 (de) * 1989-03-08 1990-09-13 Schloemann Siemag Ag Kokille mit eingiesstrichter
EP0498296A2 (fr) * 1991-02-06 1992-08-12 Concast Standard Ag Coquille pour la coulée continue de métaux notamment d'acier
DE4403050C1 (de) * 1994-01-28 1995-09-28 Mannesmann Ag Stranggießkokille zum Führen von Strängen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0875312A1 (fr) * 1997-05-02 1998-11-04 Kvaerner Metals Continuous Casting Limited Améliorations liées à et concernant la coulée
ES2152132A1 (es) * 1997-07-31 2001-01-16 Sidenor Investigacion Y Desarr "lingotera perfeccionada y lingote obtenido con la misma".
GB2329141A (en) * 1997-09-12 1999-03-17 Kvaerner Metals Cont Casting Continuous casting
EP0958871A1 (fr) * 1998-05-18 1999-11-24 Concast Standard Ag Lingotière pour la coulée continue des barres substantiellement polygonale
DE102012207786B4 (de) 2012-05-10 2025-01-02 Sms Group Gmbh Stranggießkokille

Also Published As

Publication number Publication date
AU6142496A (en) 1996-11-29
SE9501708L (sv) 1996-11-10
SE9501708D0 (sv) 1995-05-09

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