EP0538265B1 - Vorrichtung zur kontinuierlichen zugabe von gie hilfsmitteln auf den spiegel einer schmelze in einer stranggiesskokille - Google Patents

Vorrichtung zur kontinuierlichen zugabe von gie hilfsmitteln auf den spiegel einer schmelze in einer stranggiesskokille Download PDF

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Publication number
EP0538265B1
EP0538265B1 EP91909146A EP91909146A EP0538265B1 EP 0538265 B1 EP0538265 B1 EP 0538265B1 EP 91909146 A EP91909146 A EP 91909146A EP 91909146 A EP91909146 A EP 91909146A EP 0538265 B1 EP0538265 B1 EP 0538265B1
Authority
EP
European Patent Office
Prior art keywords
casting
melt
continuous
screw conveyor
delivery
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
EP91909146A
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German (de)
English (en)
French (fr)
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EP0538265A1 (de
Inventor
Hans-Friedrich Smets
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.)
Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
Original Assignee
Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
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Publication date
Application filed by Intocast GmbH Feuerfestprodukte und Giesshilfsmittel filed Critical Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
Publication of EP0538265A1 publication Critical patent/EP0538265A1/de
Application granted granted Critical
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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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like

Definitions

  • the invention relates to a device of the type corresponding to the preamble of claim 1.
  • the preferred field of application of the invention is the addition of continuous casting powder to the bath level of a continuous casting mold.
  • These continuous casting powders form a layer a few centimeters thick on the bathroom mirror. They partially melt in the area in contact with the bath level and form a slag that settles between the mold wall and the solidifying strand.
  • the still loose upper part of the casting powder layer has a heat-insulating effect and prevents excessive heat loss from the upper strand end.
  • the casting powder By taking the molten casting powder slag with it, the casting powder continues to be consumed. This consumption is in the range of about 0.3 kg or 0.8 kg per ton of steel. This quantity must therefore be supplied continuously, while maintaining a uniform layer thickness is essential for the quality of the strand surface. Uniformity must be sought in both the vertical and horizontal directions.
  • the uniformity in the vertical direction means that a certain layer thickness is maintained during the entire casting period in order to always ensure the availability of a sufficient amount of slag.
  • the uniformity in the horizontal direction means the uniformity of this layer thickness over the strand cross-section in order to achieve a uniform insulation effect at every point.
  • a flat conveying channel attached to the lower end of a storage container extends from the side to over the continuous casting mold.
  • There is a gas distribution space below the storage container into which air can be blown in, which fluidizes the casting powder located in the channel and makes it transportable.
  • air is blown in, it is conveyed from the storage container through the channel to the bath level in the continuous casting mold. If the air is turned off, the funding stops.
  • the control takes place via temperature sensors, which are arranged above the mold. When the layer of casting powder on the bath level becomes thinner and the insulating effect of the powder wears off, the temperature rises and the addition of the powder is triggered. So this is not continuous, but intermittent, similar to the manual task. Therefore, an improvement of the strand surface compared to manual powder addition is not to be expected in the described automatic powder addition. This has also been confirmed in practice. Pneumatic-mechanical metering devices have not proven themselves and have not found their way into practice.
  • the continuous addition of mold powder granules is to make economic sense, it is also a requirement that the granulate can be conveyed pneumatically and the granulate on the casting platform does not have to be transported in bags or big bags with industrial trucks or lifting vehicles to load the storage container of the addition device. Only if the pneumatic conveying is possible can the granulate be delivered in a silo vehicle, blown into a silo with a considerable usable volume standing in the hut corridor and pneumatically conveyed from there to the storage container in order to ensure the continuous supply of the casting powder without any manipulation the casting platform, which require additional labor. Pneumatic conveying is - especially with sequential casting - a basic requirement for the continuity of the entire casting process and the personnel savings.
  • the granules from casting aids in particular from continuous casting powder, which in themselves allow a functioning addition only under the action of gravity, are so low in abrasion resistance, especially when they are present as a hollow sphere, that they are destroyed during pneumatic conveying and partly as powder or Fragments get into the hopper of the feeder. But then the already mentioned effect of the blockage occurs in the addition pipe. Apart from economic reasons, the granules are therefore also unsuitable for practical metering of continuous casting powder for technical reasons.
  • the device comprises a screw conveyor running transversely above the mold with outlet nozzles, from which the mold powder emerges only with the aid of compressed air.
  • the compressed air support takes place in a certain time rhythm or controlled according to the progress of the casting strand or when a breakthrough of the slag layer is discovered.
  • the effort required for control and pneumatics is considerable and prone to failure. Compressed air support does not go without creating dust.
  • the invention has for its object to further develop the generic device so that an optimum addition of mold powder is possible with simpler means.
  • the “Chicken Feeding” principle allows automatic, consumption-based dosing without dust generation in a simple manner without external release agents such as compressed air.
  • the dimensioning of the delivery capacity to double the extraction guarantees a largely uniform filling of the screw conveyor under the given operating conditions and thus uniform conditions at the individual extraction nozzles, so that even quantities emerge or the subsequent delivery is always ensured at the individual extraction nozzles.
  • the extraction nozzle can consist of aluminum, for example. With their lower edge, they form the boundary of the removal point up to which the cone of ascent rises. In the event of wear, the tapping nozzles are simply replaced, as is the case when the cone height is changed should be passed over without the entire screw conveyor having to be changed in its height above the continuous casting mold.
  • the screw conveyor extends across the bath level, cooling, preferably with air, is recommended.
  • the bath level itself is covered by the powdered pouring aid, but in the immediate vicinity of the screw conveyor, the dip tube extends from the tundish into the upper end of the strand. This dip tube has temperatures in the order of 1000 o C.
  • the fluidization according to claim 3 loosens the amount of powdered pouring aid in the storage container and makes it quasi flowable, so that it easily passes from the storage container into the screw conveyor.
  • FIG. 1 shows a storage container 1, which is kept filled from a large silo 29, which is only indicated, via a pneumatic conveying line 2.
  • a storage container 1 In the conical lower part 3 of the storage container 1, fluidization trays 4 are attached on the inside, which are supplied with air via supply lines 5 and fluidize the continuous casting powder 6 located in the storage container 1, ie decompose it into a swirled state in which it is easily movable.
  • the fluidized continuous casting powder 6 flows from the outlet 7 at the lower end of the conical part 3 of the storage container 1 via the line 8 into the inlet 9 of a horizontal screw conveyor 10, which is driven by a drive motor 11 is driven.
  • the screw conveyor 10 extends just above the upper end of the continuous casting mold 12.
  • the dip tube 17 extends into the melt located in the continuous casting mold 12, ie extends to below the bath level 18, which is kept at a constant height by suitable measures.
  • extraction points 19 are provided in the form of parallel extraction shafts 20, the lower limit 21 of which is located at a predetermined distance above the bath level 18, which is generally the same for all extraction shafts.
  • the screw conveyor 10 comprises a tubular housing 22 in which a transport screw 23 is rotatably arranged. At the removal points 19, the housing 22 has openings 24 to which the removal shafts 20 are welded. The material conveyed past the opening 24 by the screw conveyor 23 emerges downward through the opening 24 and, since it is flowable, forms a cone 25 of powdered pouring aid. When the pouring cone 25 has risen to the lower limit 21 of the removal shaft 20, no more powdery pouring aid 6 continues to flow. However, this occurs again as soon as the cone 25 drops as a result of the melting of the powdered pouring aid 6. This type of self-regulation is known as the "chicken feeding" principle. An equilibrium state is established in which the continuous casting powder slowly flows in according to the consumption.
  • a uniform layer 26 of molten casting aid i.e. a slag, which is carried over the meniscus of the bath level 18 by the strand between its outside and the inner circumference of the continuous casting mold 12.
  • consumption occurs which causes the cone 25 to drop. It must be ensured that a certain minimum pouring height 27 of powdered pouring aid is maintained so that the heat insulation effect is maintained.
  • the lower limit of the removal point 19 is not formed on the removal shaft 20 itself, but on an overflow port 28 made of aluminum, for example, which can be replaced when its lower end is melted or when another height of the Cone 25 is desired.
  • the pressure inside the screw conveyor 10 but also plays a certain role for the discharge quantities and should therefore be as constant as possible, which means that the degree of powder filling in the screw conveyor 10 should be as constant as possible over its entire length. This is the only way to ensure that the pressure is largely the same everywhere, which contributes to the fact that all tapping points 19, regardless of their location, actually have the same amounts of powder flowing out.
  • the constancy of the degree of powder filling is the better, the greater the conveying capacity of the screw conveyor 10 in relation to the quantities withdrawn. In practice, the output would have to be at least twice this amount.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Devices For Molds (AREA)
  • General Induction Heating (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Liquid Deposition Of Substances Of Which Semiconductor Devices Are Composed (AREA)
  • Coating With Molten Metal (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Screw Conveyors (AREA)
  • Furnace Details (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
EP91909146A 1990-07-11 1991-05-17 Vorrichtung zur kontinuierlichen zugabe von gie hilfsmitteln auf den spiegel einer schmelze in einer stranggiesskokille Expired - Lifetime EP0538265B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4022117A DE4022117A1 (de) 1990-07-11 1990-07-11 Verfahren und vorrichtung zur kontinuierlichen zugabe von giesshilfsmitteln auf den spiegel einer schmelze in einer stranggiesskokille
DE4022117 1990-07-11
PCT/DE1991/000398 WO1992000819A1 (de) 1990-07-11 1991-05-17 Verfahren und vorrichtung zur kontinuierlichen zugabe von giesshilfsmitteln auf den spiegel einer schmelze in einer stranggiesskokille

Publications (2)

Publication Number Publication Date
EP0538265A1 EP0538265A1 (de) 1993-04-28
EP0538265B1 true EP0538265B1 (de) 1995-03-08

Family

ID=6410101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91909146A Expired - Lifetime EP0538265B1 (de) 1990-07-11 1991-05-17 Vorrichtung zur kontinuierlichen zugabe von gie hilfsmitteln auf den spiegel einer schmelze in einer stranggiesskokille

Country Status (15)

Country Link
US (1) US5311921A (fi)
EP (1) EP0538265B1 (fi)
JP (1) JP2609389B2 (fi)
AT (1) ATE119442T1 (fi)
AU (1) AU643028B2 (fi)
CZ (1) CZ280158B6 (fi)
DE (2) DE4022117A1 (fi)
DK (1) DK0538265T3 (fi)
ES (1) ES2069293T3 (fi)
FI (1) FI95546C (fi)
HU (3) HU9203385D0 (fi)
PL (1) PL168749B1 (fi)
SK (1) SK283875B6 (fi)
WO (1) WO1992000819A1 (fi)
ZA (1) ZA915409B (fi)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9304946U1 (de) * 1993-04-01 1994-08-04 Intocast GmbH Feuerfestprodukte und Gießhilfsmittel, 4030 Ratingen Vorrichtung zur kontinuierlichen Zugabe von pulverförmigen Gießhilfsmittel auf den Badespiegel einer Schmelze in einer Stranggießkokille
US5622218A (en) * 1995-05-15 1997-04-22 Hylsa S.A. De C.V. Method and apparatus for continuous casting of steel materials
AT403555B (de) * 1996-04-16 1998-03-25 Voest Alpine Stahl Donawitz Verfahren und vorrichtung zum aufbringen von giesspulver auf den giessspiegel beim stranggiessen
ATE210520T1 (de) * 1996-05-10 2001-12-15 Sms Demag Ag Stranggiessanlage für knüppel
DE19650587C2 (de) * 1996-12-06 1999-01-21 Thyssen Stahl Ag Vorrichtung zum Gießen einer Metallschmelze und Vorrichtung zum Verteilen von Gießpulver
DE19748948C2 (de) * 1997-10-24 2000-10-12 Mannesmann Ag Vorrichtung für die Zugabe von Gießpulver bei Stranggussanlagen
DE19956059C2 (de) * 1999-11-22 2002-03-14 E S C H Engineering Service Ct Verfahren zur Zuführung von Gießpulvergranulat zu einer Stranggußkokille
DE102007046261B3 (de) * 2007-09-26 2009-04-30 Mbl-Europe Gmbh Gießerei-Flussmittel-Granulatverteiler
DE102007050679A1 (de) 2007-10-21 2009-04-23 Voxeljet Technology Gmbh Verfahren und Vorrichtung zum Fördern von Partikelmaterial beim schichtweisen Aufbau von Modellen
DE102010056346A1 (de) 2010-12-29 2012-07-05 Technische Universität München Verfahren zum schichtweisen Aufbau von Modellen
WO2013017251A1 (en) * 2011-08-02 2013-02-07 Tata Steel Nederland Technology B.V. Supply nozzle for powder or granular material

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116367A (en) * 1975-11-12 1978-09-26 Nippon Steel Corporation Apparatus for supplying powder to continuous casting mold
CH595161A5 (fi) * 1975-11-27 1978-01-31 Concast Ag
FR2463397A1 (fr) * 1979-08-09 1981-02-20 Poncet Pierre Appareil pour la distribution automatique de poudre de laitier dans les lingotieres de coulee continue
JPS5725448A (en) * 1980-07-22 1982-02-10 Teijin Ltd High bulky knitted fabric
FR2522551A1 (fr) * 1982-03-05 1983-09-09 Lorraine Laminage Procede et dispositif d'alimentation et de regulation de la couche de poudre de lubrification dans une lingotiere de coulee continue
JPS61199560A (ja) * 1985-02-28 1986-09-04 Nippon Kokan Kk <Nkk> エア−スライド式モ−ルドパウダ供給装置
JPS6286950U (fi) * 1985-11-14 1987-06-03
JPS63123555A (ja) * 1986-11-14 1988-05-27 Nippon Steel Corp 連続鋳造用パウダ−供給方法及びその装置

Also Published As

Publication number Publication date
DE59104907D1 (de) 1995-04-13
DK0538265T3 (da) 1995-05-22
PL168749B1 (pl) 1996-04-30
FI95546C (fi) 1996-02-26
CS213691A3 (en) 1992-02-19
FI95546B (fi) 1995-11-15
HU214894B (hu) 1998-07-28
SK283875B6 (sk) 2004-04-06
DE4022117C2 (fi) 1992-07-02
HUT62219A (en) 1993-04-28
AU643028B2 (en) 1993-11-04
EP0538265A1 (de) 1993-04-28
HU9203385D0 (en) 1993-03-01
US5311921A (en) 1994-05-17
CZ280158B6 (cs) 1995-11-15
FI930059A0 (fi) 1993-01-08
JPH05507442A (ja) 1993-10-28
FI930059A (fi) 1993-01-08
ATE119442T1 (de) 1995-03-15
ES2069293T3 (es) 1995-05-01
ZA915409B (en) 1992-04-29
JP2609389B2 (ja) 1997-05-14
PL297598A1 (fi) 1992-07-13
DE4022117A1 (de) 1992-01-16
AU7856091A (en) 1992-02-04
WO1992000819A1 (de) 1992-01-23

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