WO1999024192A1 - Dispositif de coulee continue d'une barre metallique - Google Patents

Dispositif de coulee continue d'une barre metallique Download PDF

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Publication number
WO1999024192A1
WO1999024192A1 PCT/AT1998/000254 AT9800254W WO9924192A1 WO 1999024192 A1 WO1999024192 A1 WO 1999024192A1 AT 9800254 W AT9800254 W AT 9800254W WO 9924192 A1 WO9924192 A1 WO 9924192A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
continuous
inlet nozzle
casting
continuous mold
Prior art date
Application number
PCT/AT1998/000254
Other languages
German (de)
English (en)
Inventor
Josef LANSCHÜTZER
Klaus SCHÖNHUBER
Guo Xiu Shan
Heinrich THÖNE
Franz Wimmer
Original Assignee
Voest-Alpine Industrieanlagenbau Gmbh
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 Voest-Alpine Industrieanlagenbau Gmbh filed Critical Voest-Alpine Industrieanlagenbau Gmbh
Publication of WO1999024192A1 publication Critical patent/WO1999024192A1/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
    • B22D11/04—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 a device for the continuous continuous casting of a metal strip, preferably a steel strip with a strip thickness of less than 60 mm and at a casting speed between 4 and 10 m / min according to the free jet casting method, with an oscillating continuous mold, an inlet nozzle penetrated by a passage channel and a melt container.
  • pouring tubes made of refractory material such as are usually used for introducing melt into a continuous casting mold, cannot be dimensioned such that they can be introduced into the continuous casting mold even with very low casting thicknesses due to the thermal load and the material properties inherent in the refractory material that an expansion must be provided in this area.
  • the so-called “free jet casting process” offers a possibility of introducing the melt into the mold without having to insert a pouring tube protruding into the continuous casting mold.
  • the free jet casting process as described for example in US Pat. No. 3,840,062, is used Melt from a distribution vessel through outlets, which can also be designed as nozzles, introduced into the mold in free fall and immersed in the mold level.
  • the invention aims to avoid disadvantages and difficulties of conventional devices and the task of creating a device for continuous continuous casting of metal strip with a casting thickness of less than 60 mm according to the free jet casting process, with which a uniform supply of melt in a continuous mold with a substantially constant mold cross-section is possible over the mold length at a high casting speed and a continuous cast strip with high surface and inner quality can be produced.
  • the inlet nozzle advantageously has a passage channel for the melt, the outlet cross section of which, in projection onto the inlet opening of the continuous mold, is arranged essentially centrally and at a distance from the edges of the inlet opening of the continuous mold. It is expedient here that the shape of the outlet cross section of the passage channel corresponds to the cross section shape of the inlet opening of the continuous mold.
  • the inlet nozzle has at least two passage channels for the melt, the outlet cross-sections of which are substantially uniformly distributed in projection onto the inlet opening of the continuous mold and are arranged at a distance from the edges of the inlet opening of the continuous mold.
  • the passage channels are formed by slots in the inlet nozzle. These slots essentially have a rectangular cross-section, with a casting thickness of 30 mm with a cross-section of the outlet openings of 8 mm ⁇ 150-300 mm being sufficient Melt for the high casting speed of 4 - 10 m / min is fed.
  • the outlet openings in the inlet nozzle have a circular or an elliptical cross section.
  • the melt vessel and the inlet nozzle form an assembly which is connected to a displacement drive.
  • This assembly can thus be brought into a position that is favorable for its preheating.
  • the inlet nozzle is not expected to freeze while the casting operation is running.
  • the inlet nozzle advantageously has a heating device, in particular an inductive heater.
  • a further embodiment of the invention is characterized in that a mold insulating block is inserted into the continuous mold on the inlet side and connects sealingly to the inlet nozzle.
  • This mold insulating brick is used to thermally insulate the upper end of the copper plates from the inlet nozzle.
  • the free passage cross section of the mold insulating block is aligned with the cross section of the inlet opening of the continuous mold, which is formed by copper plates.
  • the mold insulating brick is made of fireproof material.
  • a protective gas line which connects the free jet space to a protective gas source, is led into a free jet space within the continuous mold, preferably through the mold insulating brick. Flushing the free jet space with argon, for example, prevents oxygen from entering this space.
  • the flow rate in the inlet nozzle can be set particularly favorably when using the free jet casting method if a pressure control valve is connected to the protective gas line and is connected to the closure device for control purposes.
  • a further advantageous embodiment of the invention is that the continuous mold has accesses for pouring oil on the input side in the area of the free jet space above the pouring level.
  • Casting oil as a lubricant is particularly suitable for free jet casting, does not require a largely quiet casting level and is therefore particularly high Pouring speeds and a rather unstable pouring level are ideally suited to safely support the formation of the strand shell.
  • the continuous mold has a length of at least 900 mm, preferably at least 1200 mm. Thanks to the long continuous mold, sufficient strand shell formation and strength of the strand are guaranteed for the subsequent support and drive roller stands.
  • Fig. 1 shows a schematic representation of a device for the continuous continuous casting of a steel strip in a longitudinal section
  • Fig. 2 illustrates the core device, consisting of a continuous mold, inlet nozzle and and melt container in an enlarged representation in a possible embodiment
  • Fig. 3 shows a possible embodiment of the arrangement of the passage channels of the inlet nozzle in relation to the inlet opening of the continuous mold in a plan view of the continuous mold.
  • Fig. 4 shows a further embodiment of the melt container in a plan view.
  • the continuous mold 5 corresponds to a conventional continuous casting mold, the mold cavity which receives the steel melt and defines the cross section of the casting strand being delimited by water-cooled copper plates 6.
  • the oscillation drive is conventional and therefore not shown.
  • the optimum length of the continuous mold at these casting speeds is at least 900 mm and is preferably in a range from 1200 mm to 1400 mm.
  • Output side connects to the Continuous mold 5 on a strand guide 7 formed from two rows of support rollers, which is followed by a drive roller stand 8 for the controlled removal of the casting strand 9.
  • the schematically illustrated arch casting system has a construction height of approximately 3 m with a machine radius of 2500 mm.
  • the melt container 3 is divided by a dam 10, which is shown in a first embodiment in FIG. 1, into two receiving basins for melt, namely into an inlet basin 11 and an outlet basin 12.
  • the dam 10 ensures a smooth overflow of the melt into the drain basin 12.
  • the melt is covered by a protective slag layer 13 in the entire melt container.
  • a variant of the melt container 3 is shown in FIG. 4, a separation into an inlet basin 11 and an outlet basin 12 also taking place in this variant by means of a dam 10.
  • the melt enters the feed basin 11 through the pouring tube 2, then flows through passages 24 arranged below the melt surface into the drain basin 12 and from there through the passage channel 16 into the continuous mold 5 (not shown).
  • This makes it possible to cover the melt with covering powder to be controlled specifically in the feed basin 11 and to prevent the penetration of the covering powder and other foreign substances into the continuous mold 5.
  • the melt vessel fulfills its function as an inclusion separator, particularly in the case of a clean steel production route with appropriate pretreatment of the steel melt.
  • the melt vessel 3 and the inlet nozzle 4 are designed such that they can be raised and lowered together, as indicated by arrow 25 in FIG. 1. To preheat the melt vessel 3 and the inlet nozzle 4, this assembly is lifted from the continuous mold 5 by means of a displacement drive (not shown) and, if necessary, also pivoted away and placed sealingly on the continuous mold 5 only immediately before the sprue.
  • FIG. 2 there is a melt outlet in the drain basin 12 of the melt container 3, into which an inlet nozzle 4 is inserted, the cross-sectional format of which corresponds to the cross-sectional format of the downstream continuous mold 5 in that the inlet opening 18 of the continuous mold 5 is covered by the inlet nozzle 4 and the inlet nozzle 4 rests on the continuous mold 5.
  • An integrated in the continuous mold 5 Mold insulating stone 14, which is formed by insulating strips made of refractory material, represents thermal insulation between the inlet nozzle 4 and the water-cooled copper plates 6.
  • a gas-tight connection between the inlet nozzle 4 and the continuous mold 5 or the mold insulating stone 14 is provided by a thin layer of ceramic insulating compound reached.
  • the melt container 3 and the inlet nozzle 4 oscillate together with the continuous mold 5.
  • the inlet nozzle 4 is penetrated by passage channels 16 which are formed by rectangular slots 17 in the region of the outlet openings 15.
  • passage channels 16 which are formed by rectangular slots 17 in the region of the outlet openings 15.
  • outlet openings with a circular or elliptical cross section are also possible.
  • the outlet openings 15 of the inlet nozzle 4 are evenly distributed in relation to the inlet opening 18 of the continuous mold 5 and are arranged at a distance from the edges of the inlet opening 18 of the continuous mold.
  • the inlet opening 18 of the continuous mold 5 is shown in FIG. 3 with dashed lines.
  • the melt emerges, as illustrated in FIG. 2, from the inlet nozzle 4 in the form of a pouring jet into the free jet space 19, which forms above the casting level 20 in the continuous mold, and dips into the casting level 20 in free fall.
  • the Kokillenisolierstein 14 is penetrated by a protective gas line 23 which opens into the free jet space 19 and this with a protective gas, for. B. argon supplied.
  • a protective gas for. B. argon supplied.
  • the inlet nozzle 4 is surrounded in a ring by a heating device 22, which is designed as an inductive heater. But other heating systems are also conceivable.
  • a gas burner is particularly economical for the heating phase before the start of casting.
  • the inlet nozzle 4 is assigned a closure device 26, which is formed in Fig. 1 by a lifting and lowering plug.
  • the closure device can also, for. B. be formed by a slide integrated into the inlet nozzle.
  • the flow rate can be changed by changing the passage cross section.
  • it is possible to set up a flow rate control by adjusting the bath height in the melt vessel 3 and the extraction control coupled to it.
  • a pressure control valve 27 is connected to the protective gas line 23 and is connected to the closure device 26 for control purposes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention concerne un dispositif de coulée continue d'une barre métallique d'une épaisseur de bande inférieure à 60 mm pour une vitesse de coulée comprise entre 4 et 10 m/min selon le procédé de coulée à jet libre. Ce dispositif comprend un moule traversant (5) oscillant, une buse d'entrée (4) et un contenant de masse en fusion (3). L'invention a pour objet d'assurer une alimentation régulière de la masse en fusion dans un moule traversant ayant une section transversale sensiblement identique sur toute sa longueur. Le moule traversant (5) est en contact hermétique avec la buse d'entrée (4).
PCT/AT1998/000254 1997-11-07 1998-10-21 Dispositif de coulee continue d'une barre metallique WO1999024192A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT189397A AT405914B (de) 1997-11-07 1997-11-07 Einrichtung zum kontinuierlichen stranggiessen eines metallbandes
ATA1893/97 1997-11-07

Publications (1)

Publication Number Publication Date
WO1999024192A1 true WO1999024192A1 (fr) 1999-05-20

Family

ID=3523300

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT1998/000254 WO1999024192A1 (fr) 1997-11-07 1998-10-21 Dispositif de coulee continue d'une barre metallique

Country Status (2)

Country Link
AT (1) AT405914B (fr)
WO (1) WO1999024192A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6957220B2 (en) 2000-11-07 2005-10-18 Research Investment Networks, Inc. System, method and article of manufacture for tracking and supporting the distribution of content electronically

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014119109B4 (de) * 2014-12-18 2018-12-13 Voestalpine Stahl Gmbh Verteiler für Stranggießanlagen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468177A (en) * 1936-10-27 1937-06-30 American Smelting Refining Improvements relating to casting metal
FR1161668A (fr) * 1956-11-21 1958-09-03 Electro Chimie Soc D Dispositif perfectionné assurant la régulation du niveau du métal dans les lingotières de coulée continue verticale
US3304585A (en) * 1964-06-18 1967-02-21 Ascast Corp Graphite continuous casting mold
GB1227312A (fr) * 1967-02-06 1971-04-07
DE2240795A1 (de) * 1971-09-30 1973-04-19 Noranda Mines Ltd Verfahren und vorrichtung zum kontinuierlichen giessen eines metallbandes
US3840062A (en) * 1968-07-18 1974-10-08 M Kenney Continuous steel casting method
DE3340844C1 (de) * 1983-11-11 1984-12-20 Mannesmann AG, 4000 Düsseldorf Stranggiesskokille mit Kuehleinrichtung fuer das Vergiessen von Metall,insbesondere von Stahl

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5232046A (en) * 1990-01-22 1993-08-03 Mesta International Strand casting apparatus and method
DE4006842A1 (de) * 1990-03-05 1991-09-12 Schloemann Siemag Ag Bandgiessanlage mit oszillierender durchlaufkokille

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468177A (en) * 1936-10-27 1937-06-30 American Smelting Refining Improvements relating to casting metal
FR1161668A (fr) * 1956-11-21 1958-09-03 Electro Chimie Soc D Dispositif perfectionné assurant la régulation du niveau du métal dans les lingotières de coulée continue verticale
US3304585A (en) * 1964-06-18 1967-02-21 Ascast Corp Graphite continuous casting mold
GB1227312A (fr) * 1967-02-06 1971-04-07
US3840062A (en) * 1968-07-18 1974-10-08 M Kenney Continuous steel casting method
DE2240795A1 (de) * 1971-09-30 1973-04-19 Noranda Mines Ltd Verfahren und vorrichtung zum kontinuierlichen giessen eines metallbandes
DE3340844C1 (de) * 1983-11-11 1984-12-20 Mannesmann AG, 4000 Düsseldorf Stranggiesskokille mit Kuehleinrichtung fuer das Vergiessen von Metall,insbesondere von Stahl

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6957220B2 (en) 2000-11-07 2005-10-18 Research Investment Networks, Inc. System, method and article of manufacture for tracking and supporting the distribution of content electronically

Also Published As

Publication number Publication date
AT405914B (de) 1999-12-27
ATA189397A (de) 1999-05-15

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