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EP0538265A1 - Procede et dispositif d'adjonction en continu d'additifs de coulee a la surface d'une masse fondue dans une coquille de coulee continue. - Google Patents

Procede et dispositif d'adjonction en continu d'additifs de coulee a la surface d'une masse fondue dans une coquille de coulee continue.

Info

Publication number
EP0538265A1
EP0538265A1 EP91909146A EP91909146A EP0538265A1 EP 0538265 A1 EP0538265 A1 EP 0538265A1 EP 91909146 A EP91909146 A EP 91909146A EP 91909146 A EP91909146 A EP 91909146A EP 0538265 A1 EP0538265 A1 EP 0538265A1
Authority
EP
European Patent Office
Prior art keywords
storage container
pouring
removal
continuous casting
screw conveyor
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.)
Granted
Application number
EP91909146A
Other languages
German (de)
English (en)
Other versions
EP0538265B1 (fr
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
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 Intocast GmbH Feuerfestprodukte und Giesshilfsmittel filed Critical Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
Publication of EP0538265A1 publication Critical patent/EP0538265A1/fr
Application granted granted Critical
Publication of EP0538265B1 publication Critical patent/EP0538265B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like

Definitions

  • the invention relates to a method and a device of the type corresponding to the preambles of claims 1 and 3, respectively.
  • 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 bath level. 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 end of the strand.
  • 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 continuously replenished, maintaining a uniform layer thickness 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 insulating 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.
  • a gas distribution space into which air can be blown in, which fluidizes the casting powder located in the channel and makes it transportable.
  • air When 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 promotion also stops.
  • the control takes place via temperature sensors, which are arranged above the mold. When the casting powder layer on the bath mirror becomes thinner and the insulating effect of the powder diminishes, the temperature rises and the addition of the powder is triggered. So this is not continuous, but intermittent, similar to the manual task. An improvement in the strand surface compared to manual powder addition is therefore not to be expected in the case of the automatic powder addition described. This has also been confirmed in practice. Pneumatic-mechanical dosing devices have not proven themselves and have not found their way into practice.
  • 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 storage container of the addition device. Then, however, the already mentioned effect of blockage occurs in the feed pipe. Apart from economic reasons, the granules are therefore also unsuitable for practical metering of continuous casting powder for technical reasons.
  • the invention is based on the object of specifying a method and a device for the automatic addition of pouring aids to the bath level of continuous casting molds, in which it is possible to work with powdered pouring aids and yet a reliable, metered addition is possible.
  • This object is achieved in its procedural aspect by that in claim 1, in its device aspect by the invention reproduced in claim 3.
  • the conveyor device can be designed as a screw conveyor.
  • This construction is space-saving simple and robust and leads to a desired forced conveyance of the powdered pouring aid.
  • the screw conveyor extends across the bath level, cooling, preferably with air, is recommended.
  • the immersion tube extends from the tundish into the upper end of the strand in the immediate vicinity of the screw conveyor. This dip tube has temperatures in the order of 1000 ° C.
  • the self-regulating removal points can be formed according to claim 6 by removal shafts which are attached to the bottom of the screw conveyor.
  • the extraction nozzles can be made 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 with another pouring Gel Stand is to be passed over without the entire screw conveyor having to be changed in its height above the continuous casting mold.
  • the dimensioning of the conveying capacity according to claim 8 ensures, under the given operating conditions, that the screw conveyor is filled to a large extent, and thus uniformly, at the individual extraction ports, so that even quantities emerge.
  • the fluidization according to claim 9 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 view of the addition device according to the invention
  • FIG. 2 shows a view of an individual removal point above the bath level.
  • 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 which is kept filled from a large silo 29, which is only indicated, via a pneumatic conveying line 2.
  • fluidizing floors 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 easy to move.
  • 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. It has an outer diameter of only about 50 mm and therefore still fits well into the narrow space between the upper edge 13 of the continuous casting mold 12 and the underside 14 of the above the continuous casting mold 12 arranged tundishs
  • the dip tube 17 merges into the continuous casting mold 12 in the bottom of the tundish 15.
  • the dip tube 17 extends into the melt located in the continuous casting mold 12, i.e. extends to below the bath level 18, which is kept at a constant height by suitable measures.
  • 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 agent 6 flows in again. However, this occurs again as soon as the pouring 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 flows slowly in accordance with the consumption.
  • a uniform layer 26 of molten pouring aid ie a slag, is formed, which extends over the meniscus of the bath level 18 from the strand between its outside and the inner circumference of the continuous casting mold 12 is taken away.
  • consumption occurs which causes the pouring cone 25 to drop. It must be ensured that a certain minimum pouring height 27 of powdered casting aid is maintained so that the thermal insulation effect is maintained.
  • the lower limit of the removal point 19 is not formed on the removal shaft 20 itself, but rather on a removal nozzle 28, for example made of aluminum, which can be replaced when its lower end is melted or when another one is pushed over it 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 funding would have to be at least twice these amounts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Devices For Molds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • General Induction Heating (AREA)
  • Furnace Details (AREA)
  • Screw Conveyors (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Coating With Molten Metal (AREA)

Abstract

Un additif pulvérulent de coulée (6) est prélevé à l'état fluidisé dans un réservoir (1) et amené par une vis convoyeuse au-dessus d'une coquille (12) de coulée continue. A la fin de la vis convoyeuse (10) est monté un conduit de retour (30), par lequel la quantité d'additif de coulée (6) non prélevée à des points de prélèvement (19) situés au-dessus de la surface du bain (18) est remise en circulation et reconduite au réservoir (1).
EP91909146A 1990-07-11 1991-05-17 Dispositif d'adjonction en continu d'additifs de coulee a la surface d'une masse fondue dans une coquille de coulee continue Expired - Lifetime EP0538265B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4022117 1990-07-11
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
PCT/DE1991/000398 WO1992000819A1 (fr) 1990-07-11 1991-05-17 Procede et dispositif d'adjonction en continu d'additifs de coulee a la surface d'une masse fondue dans une coquille de coulee continue

Publications (2)

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

Family

ID=6410101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91909146A Expired - Lifetime EP0538265B1 (fr) 1990-07-11 1991-05-17 Dispositif d'adjonction en continu d'additifs de coulee a la surface d'une masse fondue dans une coquille de coulee continue

Country Status (15)

Country Link
US (1) US5311921A (fr)
EP (1) EP0538265B1 (fr)
JP (1) JP2609389B2 (fr)
AT (1) ATE119442T1 (fr)
AU (1) AU643028B2 (fr)
CZ (1) CZ280158B6 (fr)
DE (2) DE4022117A1 (fr)
DK (1) DK0538265T3 (fr)
ES (1) ES2069293T3 (fr)
FI (1) FI95546C (fr)
HU (3) HUT62219A (fr)
PL (1) PL168749B1 (fr)
SK (1) SK283875B6 (fr)
WO (1) WO1992000819A1 (fr)
ZA (1) ZA915409B (fr)

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
EP0906163B1 (fr) * 1996-05-10 2001-12-12 SMS Demag AG Installation de coulee continue pour billettes
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 (fr) * 2011-08-02 2013-02-07 Tata Steel Nederland Technology B.V. Buse d'alimentation pour matériau en poudre ou en granulés

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 (fr) * 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 (fr) * 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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9200819A1 *

Also Published As

Publication number Publication date
DE4022117A1 (de) 1992-01-16
AU643028B2 (en) 1993-11-04
ZA915409B (en) 1992-04-29
PL168749B1 (pl) 1996-04-30
DK0538265T3 (da) 1995-05-22
JP2609389B2 (ja) 1997-05-14
PL297598A1 (fr) 1992-07-13
SK283875B6 (sk) 2004-04-06
DE59104907D1 (de) 1995-04-13
JPH05507442A (ja) 1993-10-28
EP0538265B1 (fr) 1995-03-08
HU214894B (hu) 1998-07-28
WO1992000819A1 (fr) 1992-01-23
HUT62219A (en) 1993-04-28
FI930059A0 (fi) 1993-01-08
FI95546B (fi) 1995-11-15
DE4022117C2 (fr) 1992-07-02
CS213691A3 (en) 1992-02-19
AU7856091A (en) 1992-02-04
HU9203385D0 (en) 1993-03-01
ES2069293T3 (es) 1995-05-01
ATE119442T1 (de) 1995-03-15
CZ280158B6 (cs) 1995-11-15
FI95546C (fi) 1996-02-26
US5311921A (en) 1994-05-17
FI930059L (fi) 1993-01-08

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