EP0743114B2 - Verfahren zur Schmierung der Wände einer Stranggusskokille für Metalle und Kokille zur Durchführung dieses Verfahrens - Google Patents

Verfahren zur Schmierung der Wände einer Stranggusskokille für Metalle und Kokille zur Durchführung dieses Verfahrens Download PDF

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Publication number
EP0743114B2
EP0743114B2 EP96400896A EP96400896A EP0743114B2 EP 0743114 B2 EP0743114 B2 EP 0743114B2 EP 96400896 A EP96400896 A EP 96400896A EP 96400896 A EP96400896 A EP 96400896A EP 0743114 B2 EP0743114 B2 EP 0743114B2
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EP
European Patent Office
Prior art keywords
metal
lubricant
tubular
mould
metal element
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
EP96400896A
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English (en)
French (fr)
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EP0743114A1 (de
EP0743114B1 (de
Inventor
Eric Perrin
Pierre Courbe
Jacques Spiquel
Paul Naveau
Jean-Marc Jolivet
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.)
Centre de Recherches Metallurgiques CRM ASBL
Forges et Acieries de Dilling SA
Ascometal SA
Sollac SA
Ugitech SA
Sogepass
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
Forges et Acieries de Dilling SA
Ascometal SA
Sollac SA
Ugine Savoie Imphy SA
Sogepass
Lorraine de Laminage Continu SA SOLLAC
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Application filed by Centre de Recherches Metallurgiques CRM ASBL, Forges et Acieries de Dilling SA, Ascometal SA, Sollac SA, Ugine Savoie Imphy SA, Sogepass, Lorraine de Laminage Continu SA SOLLAC filed Critical Centre de Recherches Metallurgiques CRM ASBL
Publication of EP0743114A1 publication Critical patent/EP0743114A1/de
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Publication of EP0743114B1 publication Critical patent/EP0743114B1/de
Publication of EP0743114B2 publication Critical patent/EP0743114B2/de
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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
    • B22D11/07—Lubricating the moulds

Definitions

  • the invention relates to the field of continuous casting of metals, and more specifically, it relates to the method of lubricating the molds of so-called "continuous casting under load” installations, in which it is sought to move the surface of the liquid metal in the mold. of the zone where the solidification of the cast product begins.
  • the document FR-A-2,704,786 describes the state of the art according to the preambles of claims 1 and 3.
  • the conventional continuous casting operation of the steel schematically consists in continuously pouring the molten metal into a bottomless vertical tubular oscillating mold, the metal walls (copper or copper alloy) vigorously cooled by internal circulation of water, and to extract, also continuously, a product (slab, bloom or billet according to the dimensions of the mold) already solidified externally on a few centimeters thick.
  • the solidification of this product is completed in the lower stages of the machine, where the product is initially, at the outlet of the mold, forcibly cooled by spraying water, then naturally cooled. It is then cut to the desired length.
  • the oscillation of the mold has the function of preventing the solidified skin of the product from sticking locally on the wall of the mold, which would tear the skin causing a "breakthrough", that is to say the flow of liquid metal by this tear.
  • the consequence of such an incident would be the need to immediately stop the casting, and the risk of causing serious damage to the machine.
  • a known remedy for this problem consists in moving the surface of the liquid metal in the mold to the level where the solidification of the product begins.
  • a uncooled tubular element called “riser”
  • the latter is made of a heat-insulating material such as an aluminous refractory
  • the solidification of the skin of the product does not normally start on its walls, and starts only at the level of the metal element. Fluctuations in the level of the liquid metal surface thus no longer affect the area where the solidification begins. This is done very regularly and leads to a quality of surface and subcutaneous products significantly improved compared to conventional continuous casting facilities. Such facilities are usually referred to as "continuous casting".
  • the immersed nozzle which brings the liquid metal into the ingot mold, has its open end held inside the riser.
  • the metal that it contains is therefore a buffer volume that dampens the turbulence due to the flow of metal inlet, before it reaches the level of the metal element. This also contributes to a greater regularity in the solidification of the first metal layers than in the case of conventional continuous flows, where these turbulences affect the entire upper part of the cooled metal element and can slow the solidification in the vicinity of the zones of strong recirculations.
  • this powder ensures the capture of non-metallic inclusions that have risen to the surface of the metal, a protection of the liquid metal against atmospheric reoxidation and a stop of the radiation emitted by the metal.
  • the requirements on the composition of the powder, which governs in particular its fluidity at the powder / metal interface, are not identical for all these functions. The choice of the composition is therefore necessarily a compromise that does not ensure optimally any of them.
  • the other method of lubrication is to deposit on the surface of the metal in the mold a layer of oil, such as rapeseed oil, so that it infiltrates between the wall and the solidified skin.
  • the first is not transposable to the case of casting under load.
  • the powder that must be deposited on the surface of the metal in the riser to protect the metal and to capture the inclusions can not reach the upper edge of the metallic element, where initiates the solidification of the skin, and therefore has no role in lubrication.
  • it is not thinkable to inject powder at the junction between the riser and the metal element, because it would cause a pollution of the metal by the fraction of the powder which, inevitably, would be driven within it. It is therefore chosen to ensure the lubrication of the mold by an oil injection made on the inner periphery of the metal element, in the vicinity of its junction with the riser as for example in FR-A-2,704,786 .
  • the object of the invention is to propose a method for optimizing the lubrication of the entire cooled metal part of the mold of any continuous casting installation under load in that it simplifies the design of continuous casting molds. in charge.
  • the subject of the invention is a method of lubricating a continuous casting mold in charge of a metallic product of the type comprising a vertically oscillating and vigorously cooled metallic tubular element, defining a passage for the cast metal, and intended to cause the solidification of the metallic product in contact with its wall in said passage, said tubular element being surmounted by a tubular riser made of a thermally insulating material disposed on the upper edge of said element and in its extension, according to which the surface is maintained molded metal molded into the interior of said extension, and characterized in that , in a manner known per se injection of a lubricant through said metal tubular element in the direction of said metal product being solidified, is carried out said injection with a lubricant in the liquid state injected into s points annularly distributed on a single level of said tubular element located at a distance greater than 20 cm from said upper edge of the latter, where initiating the solidification of said product, and with a lubricant flow sufficient to cause a
  • the subject of the invention is also an ingot mold for a continuous casting installation in charge of metal products of the type comprising an energetically cooled metal tubular element, defining a passage for the cast metal, and intended to cause in contact with its wall in said passage the solidification of the metallic product, a tubular riser, made of a thermally insulating material, disposed on the upper edge of said cooled metal tubular element and in its extension, means for vertically oscillating said mold, characterized in that it has known means in itself for injecting a lubricant through said metal tubular element in the direction of said metal product being solidified, said injection means, suitable for injecting a lubricant in the liquid state, being placed at a single level of said metallic tubular element located at a di upper stance. 20 cm from said upper edge of the latter, where initiates the solidification of said product.
  • the invention consists in locating the injection of liquid lubricant at a level of the continuous casting mold under load situated very substantially lower than the level at which the solidification of the cast product begins, and not at this point. level itself.
  • the inventors have indeed found that the vertical oscillation movements of the mold could be sufficient to cause a significant rise in a fraction of the lubricant along the walls of the cooled metal element.
  • By appropriately adjusting the location and the parameters of the injection of the lubricant it is therefore possible to send a significant amount to the level where the solidification begins, and thus ensure satisfactory lubrication of the mold on the entire height of its metal element cooled only with this injection. This amount must, on the other hand, be moderate enough not to cause unacceptable gas emissions in the mold.
  • On continuous casting under load it is no longer necessary to perform a liquid lubricant injection at several levels of the cooled element of the mold, which greatly simplifies its design.
  • the mold 1 represented on the figure 1 is, as is conventional in continuous casting in charge of steel or other metals, composed of two superimposed elements.
  • the main one is a metallic tubular element 2 of copper or copper alloy, whose inner surface 3 defines a passage 4 of identical dimensions to those of the product that is desired to flow, and of round cross section, square or rectangular.
  • This metal tubular element 2 may consist of a single piece (this is most often the case for the casting of rounds, billets and steel blooms), or be formed by an assembly of plates each corresponding to a face of the mold 1 (general case for the casting of steel slabs).
  • the metal tubular element 2 is cooled by a circulation of water 5, formed for example between its outer surface 6 and a jacket 7 which surrounds it.
  • the second element of the mold On the upper edge 8 of the metal tubular element 2 is fixed the second element of the mold, namely a raised 9 formed by a tubular element of a refractory material such as a 90-10% alumina-silica mixture.
  • the inner surface 10 of the extension 9 defines a passage 11 located in the extension of the passage 4 defined by the inner surface 3 of the metal tubular element 2.
  • these two passages 4 and 11 have the same dimensions, but it can be expected that one of them has a smaller size than the other, to make more frank the beginning of the solidification of the cast product.
  • a submerged nozzle 12 connected to a not shown distributor containing the liquid metal 13 to flow brings it into the passage 11 inside the extension 9.
  • Product 1 then completes its solidification and cooling by simple convection and radiation.
  • the mold 1 also comprises, in a conventional manner, an unrepresented device making it possible to print, as a whole, vertical oscillation movements along the arrow 17. These oscillations can be sinusoidal or obey a more complex law. They usually have a frequency of a few Hz, and an amplitude of a few mm.
  • the mold 1 also comprises a device ensuring lubrication of the inner surface 3 of the cooled metal tubular element 2, by injection on the periphery of this surface of a lubricating liquid, such as oil, intended to be interposed between this surface 3 and the solidified crust 14 of the product 16.
  • a lubricating liquid such as oil
  • the injection lubricant liquid is performed only at a single level, more than 20 cm away from the upper edge 8 of the cooled metal element 2.
  • This injection is performed by channels 18, 19 formed in the walls of the element 2, and driving the lubricant to orifices 20, 21 opening on the inner surface 3 of this element 2, so as to distribute it all around the solidified crust 14 of the product 16.
  • the lubricant is itself fed into the channels 18, 19 by means not shown connected to the lower orifices 22, 23 of the channels 18, 19, opening on the lower edge 24 of the cooled metal element 2.
  • the figure 2 shows a more detailed view of a non-limiting embodiment of the metal element 2 of the mold 1, freed of the jacket 7 surrounding it when installed in the casting machine.
  • This example is suitable for casting steel products with a cross section of 155 mm square.
  • channels 18, 18', 19 each open at their upper end, in a distribution chamber 25, 25 'constituted by a machined recess transversely to the channel 18, 18 ', 19 corresponding on the outer surface 6 of the metal element 2, and which extends to near the edges 26, 27, 28 of said element 2.
  • each of these chambers 25, 25 ' is pierced with a plurality of small holes 20, 20', 21 which open on the inner face 3 of the metal element 2 and constitute the aforementioned orifices which bring the lubricant between the metal element 2 and the solidified crust 14 of the product
  • the channels 18, 18 ', 19 and the distribution chambers 25, 25', after their machining, are closed sealingly by covers (not shown) which are fixed on the outer face 6 of the element 2, for example by electron beam welding.
  • This method of attachment has the advantage of allowing the application of ultrasound to the mold 1 without deterioration of the tightness of the connections lid-metal element 2, which would not be possible if this fixation was carried out using quote. It is recalled that ultrasound can, in known manner, contribute to improving the lubrication of the mold 1 and increase the efficiency of its cooling system.
  • fine longitudinal grooves 29 are formed on the inner face 3 of the metal element 2, between its lower edge 24 and the distribution chambers 25, 25 'of the lubricant, in line with the orifices 20, 20', 21. grooves facilitate the evacuation of excess lubricating liquid and gases resulting from its cracking towards the lower part of the mold 2.
  • the parameters to be taken into account for the determination of the optimum injection location of the lubricant in a mold of a given format are essentially the casting speed of the product 16, the amplitude and the frequency of the oscillations of the mold 1 and the lubricant flow rate. injected. All other things being equal, the lubricant rises along the metal element 2 to a height that is all the greater as its flow rate is high and the casting speed is low.
  • the mold 1 must therefore be designed so that, by adjusting the lubricant flow, it is possible to obtain a correct lubrication of the entire mold 1 for all the operating conditions in which it is likely to to be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Lubricants (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Claims (4)

  1. Verfahren zur Schmierung einer Stranggusskokille für einen metallischen Gegenstand, die ein stark gekühltes in senkrechter Richtung oszillierendes metallisches rohrförmiges Bauteil aufweist, das einen Durchlass für das gegossenene Metall bildet und das dazu dient, bei Wandberührung im Durchlass die Erstarrung des metallischen Gegenstandes zu bewirken, wobei auf dem rohrförmigen Bauteil ein rohrförmiger Eingussaufsatz aus wärmeisolierendem Material befestigt ist, der am oberen Rand des Elements und in dessen Verlängerung angebracht ist, wobei die Oberfläche des stranggegossenen Materials im Inneren des Eingussaufsatzes belassen wird, dadurch gekennzeichnet, dass eine Einspritzung eines Schmiermittels durch das metallische rohrförmige Bauteil in Richtung des erstarrenden metallischen Gegenstands nach einem bekannten Verfahren durchgeführt wird, wobei diese Einspritzung eines sich im flüssigen Zustand befindlichen Schmiermittels an Stellen erfolgt, die ringförmig auf einem einzigen Niveau des rohrförmigen Bauteils verteilt angeordnet sind, wobei dieses Niveau um mehr als 20 cm vom niedrigsten Niveau entfernt ist, an dem die Erstarrung des Gegenstandes einsetzen kann und dass die Schmiermittelmenge ausreicht, um ein Aufsteigen eines Teils des Schmiermittels entlang der Wand bis zu dem Niveau des oberen Rands des gekühlten metallischen rohrförmigen Bauteils zu bewirken.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Schmiermittel Öl ist.
  3. Kokille (1) für eine Stranggussanlage für metallische Gegenstände (16), mit einem stark gekühlten metallischen rohrförmigen Bauteil (2), das einen Durchlass (4) für das gegossene Metall bildet und das dazu dient, bei Berührung mit der Wand (3) im Durchlass (4) die Erstarrung des metallischen Gegenstandes (16) zu bewirken, mit einem rohrförmigen Eingussaufsatz (9) aus einem thermisch isolierenden Material, der am oberen Rand (8) des gekühlten metallischen rohrförmigen Bauteils (2) und in dessen Verlängerung angeordnet ist, mit Mitteln, um die Kokille (1) vertikal oszillieren zu lassen, dadurch gekennzeichnet, dass sie bekannte Mittel zur Durchführung einer Einspritzung eines Schmiermittels durch das metallische rohrförmige Bauteil (2) in Richtung des erstarrenden metallischen Gegenstands (16) aufweist, wobei die Einspritzmittel, die zum Einspritzem eines Schmiermittels im flüssigen Zustand geeignet sind, auf einem einzigen Niveau des metallischen rohrförmigen Bauteils (2) angeordnet sind, wobei dieses Niveau mehr als 20 cm vom oberen Rand (8) des metallischen rohrförmigen Bauteils (2) entfernt ist, an dem die Erstarrung des Gegenstandes (16) einsetzen kann.
  4. Kokille nach Anspruch 3, dadurch gekennzeichnet, dass die Einspritzmittel für ein Schmiermittel im flüssigen Zustand Kanäle (18, 18', 19) aufweisen, die in den Wänden des metallischen rohrförmigen Bauteils (2) vorgesehen sind, wobei jeder in einer Verteilkammer (25, 25') mündet, die mit einer Vielzahl von Öffnungen (20, 20') versehen ist, welche an der Innenwand (3) des metallischen rohrförmigen Bauteils (2) münden, sowie Mittel aufweisen, um das Schmiermittel den Kanälen (18, 18', 19) zuzuführen.
EP96400896A 1995-05-17 1996-04-26 Verfahren zur Schmierung der Wände einer Stranggusskokille für Metalle und Kokille zur Durchführung dieses Verfahrens Expired - Lifetime EP0743114B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9505794A FR2734186B1 (fr) 1995-05-17 1995-05-17 Procede de lubrification des parois d'une lingotiere de coulee continue des metaux et lingotiere pour sa mise en oeuvre
FR9505794 1995-05-17

Publications (3)

Publication Number Publication Date
EP0743114A1 EP0743114A1 (de) 1996-11-20
EP0743114B1 EP0743114B1 (de) 2000-09-13
EP0743114B2 true EP0743114B2 (de) 2009-04-01

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ID=9479031

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EP96400896A Expired - Lifetime EP0743114B2 (de) 1995-05-17 1996-04-26 Verfahren zur Schmierung der Wände einer Stranggusskokille für Metalle und Kokille zur Durchführung dieses Verfahrens

Country Status (10)

Country Link
US (1) US5682942A (de)
EP (1) EP0743114B2 (de)
JP (1) JPH09220645A (de)
KR (1) KR100371413B1 (de)
CN (1) CN1061575C (de)
AT (1) ATE196269T1 (de)
CA (1) CA2176843C (de)
DE (1) DE69610249T3 (de)
ES (1) ES2150084T5 (de)
FR (1) FR2734186B1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1066898B1 (de) * 1999-07-06 2005-03-09 SMS Demag AG Verfahren zur Schmelzenführung in einer Stranggiessmaschine
JP3729197B2 (ja) * 2001-08-06 2005-12-21 新東工業株式会社 鋳型造型機をモニタする方法及びシステム
WO2006046677A1 (ja) * 2004-10-25 2006-05-04 Showa Denko K.K. 連続鋳造装置、連続鋳造方法およびアルミニウム合金鋳造棒
CN100418667C (zh) * 2006-05-19 2008-09-17 苏州有色金属加工研究院 铝及铝合金半连铸连续润滑结晶器
CN106735013A (zh) * 2016-11-16 2017-05-31 南京钢铁股份有限公司 一种提高大方坯头坯质量的连铸工艺
CN110681834B (zh) * 2019-11-05 2023-09-19 中冶赛迪信息技术(重庆)有限公司 方坯连铸结晶器及冷却方法
CN111570738B (zh) * 2020-06-12 2022-03-29 包头常铝北方铝业有限责任公司 一种改善5系铝合金扁锭表面质量的方法
EP4008451B1 (de) * 2020-12-07 2024-05-15 Hertwich Engineering GmbH Kokille zum stranggiessen mit einem in die lauffläche einmündenden schmiermittelkanal

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57103758A (en) * 1980-12-18 1982-06-28 Nippon Steel Corp Mold for continuous casting
BE899544A (fr) * 1984-04-27 1984-08-16 Centre Rech Metallurgique Procede et dispositif pour la lubrification d'une lingotiere de couleecontinue.
US5271452A (en) * 1987-03-26 1993-12-21 Sms Concast Inc. Continuous casting method and apparatus
JPH06104266B2 (ja) * 1989-07-14 1994-12-21 住友金属工業株式会社 高速鋳造における鋳片の縦割れ防止方法
FR2672524B1 (fr) * 1991-02-11 1993-05-28 Siderurgie Fse Inst Rech Lingotiere pour coulee continue de produits metalliques.
FR2704786B3 (fr) * 1993-03-30 1995-03-10 Lorraine Laminage Procédé de coulée continue en charge des métaux, notamment de l'acier, et lingotière pour sa mise en Óoeuvre.
FR2703609B3 (fr) * 1993-03-30 1995-02-10 Lorraine Laminage Procédé de coulée continue en charge des métaux et lingotière pour sa mise en Óoeuvre.
FR2708222B3 (fr) * 1993-06-30 1995-07-13 Unimetall Sa Lingotière de coulée continue des métaux notamment de l'acier, équipée de moyens de lubrification de sa face interne.

Also Published As

Publication number Publication date
US5682942A (en) 1997-11-04
DE69610249T2 (de) 2001-04-26
CN1145287A (zh) 1997-03-19
ES2150084T3 (es) 2000-11-16
FR2734186A1 (fr) 1996-11-22
KR960040510A (ko) 1996-12-17
ATE196269T1 (de) 2000-09-15
EP0743114A1 (de) 1996-11-20
EP0743114B1 (de) 2000-09-13
ES2150084T5 (es) 2009-08-31
JPH09220645A (ja) 1997-08-26
FR2734186B1 (fr) 1997-06-13
CN1061575C (zh) 2001-02-07
CA2176843C (fr) 2008-01-08
CA2176843A1 (fr) 1996-11-18
KR100371413B1 (ko) 2003-04-08
DE69610249D1 (de) 2000-10-19
DE69610249T3 (de) 2010-04-15

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