EP0201069B1 - Procédé de coulée continue de produits métalliques - Google Patents

Procédé de coulée continue de produits métalliques Download PDF

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Publication number
EP0201069B1
EP0201069B1 EP86106102A EP86106102A EP0201069B1 EP 0201069 B1 EP0201069 B1 EP 0201069B1 EP 86106102 A EP86106102 A EP 86106102A EP 86106102 A EP86106102 A EP 86106102A EP 0201069 B1 EP0201069 B1 EP 0201069B1
Authority
EP
European Patent Office
Prior art keywords
casting
cooling surface
wetting
crust
mold
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
Application number
EP86106102A
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German (de)
English (en)
Other versions
EP0201069A1 (fr
Inventor
Erik A. Olsson
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Individual
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Individual
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4223676&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0201069(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Priority to AT86106102T priority Critical patent/ATE41616T1/de
Publication of EP0201069A1 publication Critical patent/EP0201069A1/fr
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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields

Definitions

  • the invention relates to a method for avoiding the formation of cracks during the continuous casting of metallic products, wherein the melt solidifies on a cooling surface and the wetting limit between the melt and the cooling surface is given a configuration which deviates from the direction perpendicular to the casting direction, and a device for carrying it out of the procedure.
  • a large part of the defects occurring on the surfaces of continuously cast products consist of cracks in the primarily solidifying crust, the cause of which is to be found in a hindrance to the natural shrinkage during cooling.
  • Co-determining factors are too much friction between the crust and the forming wall, as well as the static pressure of the metal acting on the crust, as is typical when casting in both open and closed molds.
  • the crust can tear open in all directions in which the shrinkage is impeded, unless the ductility of the material at the correspondingly high temperatures would be sufficient to prevent such cracks from occurring. In most cases, however, this is not to be expected.
  • a crack formation in the crust along the casting direction of the strand due to the constantly increasing static pressure inside is attempted more or less successfully by using slightly conical molds.
  • the different metals and metal alloys have different shrink masses and the shrinkage can vary considerably depending on the casting temperature and casting speed, it is almost impossible to determine the optimal taper of the mold.
  • a strand with too little shrinkage compared to the taper of the mold would get stuck in it and, in the worst case, even tear off.
  • the friction between the crust and the shaping walls plays a major role. Because of its flexibility, the crust can bulge under the influence of static pressure and thus usually maintain contact with the mold over its entire length, but this is precisely why the friction, which opposes natural shrinkage, increases.
  • crusts in strands of round, oval or polygonal cross-section with large corner radii are forced to stretch to find contact with the mold. This in turn leads to longitudinal cracks.
  • a possible weak point is adequately secured in most cases by the co-moving cooling surface, which accompanies the layer until it has completely solidified, so that an actual breakdown of the melt hardly occurs here. Nevertheless, surface defects in the manner of cracks lead to rejects because there is no reason to remove the defects by chiselling and grinding for obvious reasons.
  • the invention has for its object to avoid the formation of surface defects in the manner of cracks, or scars of cracks refilled with melt, and to further increase the operational safety of such systems and their productivity in the continuous casting of metallic products.
  • the method according to the invention is characterized in that the wetting limit is given a zigzag or wave shape.
  • the mold 1 mainly consists of a copper tube 2 with the cooling surface 3 and a water jacket 4 surrounding it.
  • the pouring level is 5, the wetting limit of the cooling surface 3 by the metal is 6, which is synonymous with the beginning of the solidification front 7.
  • the melt 9 fed through a pouring pipe 8 to the mold solidifies in contact with the cooling surface 3. Where there is no such contact, the formation of a crust 10 is at least delayed.
  • An electrical conductor 11 which is guided around the mold 1 in a suitable manner generates an alternating electromagnetic field which keeps the melt 9 away from the cooling surface 3 in predetermined areas.
  • 3 and 4 show a device with a circumferential cooling surface 20 in the form of a belt 22 driven and guided by a pair of rollers 21 a, 21 b to produce a very thin layer 23.
  • the melt 24 solidifies practically immediately when the cooling surface is touched to a thin product. This process implies a momentary shrinkage of the layer 23, the forces of which, in view of the friction between the layer and the cooling surface 20, normally lead to longitudinal cracks.
  • the exemplary embodiment furthermore shows a funnel 25 which serves for feeding and for uniformly distributing the melt 24 over the width of the belt 22, the walls 26, 27, 28 of which ensure the limitation of the wetting of the cooling surface 20.
  • the wetting limit 29 identical to the wall facing away from the pouring direction, is preferably arranged obliquely to the perpendicular of the pouring direction. This alone can completely rule out the risk of longitudinal cracks in most cases because the shrinkage of the nascent layer is at an angle to Wetting limit 29 runs.
  • the wetting limit can have a shape along the line 30, the same or similar to that illustrated in FIGS. 6a, 6b.
  • the funnel 31 has arrow-shaped walls 32, 33, 34, 35 to limit the wetting of the cooling surface 36 by the melt 37. It is clearly evident from this that the shrinkability of the material is significantly improved if the wetting limit is longer than the width of the layer measured perpendicular to the casting direction.
  • an electrical conductor 38 for generating an alternating electromagnetic field can also be arranged in a suitable manner here.
  • Means for regulating the current strength and / or frequency are provided to control the repulsive force.
  • the electrical conductor 38 can also be arranged so as to be adjustable with respect to the melt and the cooling surface.
  • wetting limits 40, 41 which are expedient both in the casting of thin layers and in the conventional casting in open continuous molds to avoid longitudinal cracks. It is irrelevant whether the wetting limit is caused by appropriately shaped electrical conductors (11 in FIGS. 1 and 2, 38 in FIGS. 3 to 5) or by the contour of the walls themselves (29, 30 in FIGS. 4, 34 in FIG. 5) is determined. Both means are equally suitable for influencing the wetting of the cooling surface by the metal in the sense of the invention.
  • the cooling surface 42 is to be understood as a flat surface or as a development of the cooling surface of a polygonal or round continuous mold. However, it is only important when casting on a circumferential cooling surface that the walls 43, 44 facing the casting direction are equipped as negatives to the opposite wall. This ensures that the solidification distances s, s i and thus the solidification times of each length section remain the same and that a layer of the same thickness is created.
  • the solidification paths s, si can have an extent of only a few millimeters, especially when very thin layers with extremely short solidification times are cast, for example when producing a material with an amorphous structure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Forging (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (6)

1. Procédé pour éviter la formation de fissures au cours de la coulée continue de produits métalliques, dans lequel le métal liquide (9, 24, 37) est envoyé sur une surface de refroidissement (3, 20, 36, 42) pour s'y solidifier et dans lequel on donne à la limite de mouillage (6, 29, 40, 41) entre le métal liquide et la surface de refroidissement une configuration qui s'écarte de la direction perpendiculairement à la direction de coulée, caractérisé en ce que l'on donne à la limite de mouillage (6, 29, 40, 41) une forme en zigzag ou en ondulation.
2. Dispositif pour l'application du procédé selon la revendication 1, caractérisé en ce qu'un conducteur (11, 38) alimenté en courant alternatif, détermine la configuration de la limite de mouillage (6, 29).
3. Dispositif selon la revendication 2, caractérisé en ce qu'il comporte des moyens de réglage de l'intensité et/ou de la fréquence du courant.
4. Dispositif selon l'une des revendications 2 ou 3, caractérisé en ce que le conducteur (11, 38) est monté de manière à pouvoir être réglé par rapport à la surface de refroidissement (3, 20, 36).
5. Dispositif pour l'application du procédé selon la revendication 1, caractérisé en ce que, dans le cas de la coulée d'une couche mince sur une surface de refroidissement mobile (42), la limite de mouillage (40, 41) est déterminée par la paroi de l'entonnoir située à l'opposé de la direction de coulée.
6. Dispositif selon la revendication 5, caractérisé en ce que la paroi opposée (43, 44) tournée dans la direction de coulée présente une configuration qui constitue le négatif de la limite de mouillage (40, 41) de l'autre paroi.
EP86106102A 1985-05-10 1986-05-03 Procédé de coulée continue de produits métalliques Expired EP0201069B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86106102T ATE41616T1 (de) 1985-05-10 1986-05-03 Verfahren zum kontinuierlichen giessen metallischer produkte.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2005/85A CH667226A5 (de) 1985-05-10 1985-05-10 Verfahren zum kontinuierlichen giessen metallischer produkte.
CH2005/85 1985-05-10

Publications (2)

Publication Number Publication Date
EP0201069A1 EP0201069A1 (fr) 1986-11-12
EP0201069B1 true EP0201069B1 (fr) 1989-03-22

Family

ID=4223676

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86106102A Expired EP0201069B1 (fr) 1985-05-10 1986-05-03 Procédé de coulée continue de produits métalliques

Country Status (6)

Country Link
US (1) US4936372A (fr)
EP (1) EP0201069B1 (fr)
JP (1) JPS61259858A (fr)
AT (1) ATE41616T1 (fr)
CH (1) CH667226A5 (fr)
DE (1) DE3662495D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2609656B1 (fr) * 1987-01-15 1989-03-24 Cegedur Procede de reglage au niveau de la ligne de contact de la surface libre du metal avec la lingotiere dans une coulee verticale de produits de section quelconque
DE4039959C1 (fr) * 1990-12-14 1992-01-23 Wieland-Werke Ag, 7900 Ulm, De

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA692141A (en) * 1964-08-04 Herrmann Erhard Continuous casting of plates and strips from non-ferrous metals
DE911425C (de) * 1950-09-05 1954-05-13 E H Siegfried Junghans Dr Ing Giessverfahren, insbesondere Stranggiess-Verfahren und -Anlage
DE1095999B (de) * 1953-07-30 1960-12-29 Boehler & Co Ag Geb Verfahren zum kontinuierlichen Giessen, insbesondere von schwer schmelzbaren Metallen
DE1028300B (de) * 1956-11-12 1958-04-17 Olsson Erik Allan Kokille zum kontinuierlichen Giessen
JPS5232824A (en) * 1975-09-09 1977-03-12 Nippon Steel Corp Method of casting metal melts
JPS52134817A (en) * 1976-05-07 1977-11-11 Nippon Steel Corp Casting method of molten metal
FR2391014A1 (fr) * 1977-05-18 1978-12-15 Siderurgie Fse Inst Rech Procede de coulee continue centrifuge electromagnetique de barres metalliques non circulaires
US4330025A (en) * 1980-09-11 1982-05-18 Allegheny Ludlum Steel Corporation Nozzle in a strip casting apparatus
LU83988A1 (fr) * 1982-03-09 1983-11-17 Arbed Lingotieres de coulee continue

Also Published As

Publication number Publication date
US4936372A (en) 1990-06-26
ATE41616T1 (de) 1989-04-15
EP0201069A1 (fr) 1986-11-12
DE3662495D1 (en) 1989-04-27
CH667226A5 (de) 1988-09-30
JPS61259858A (ja) 1986-11-18

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