EP0237478B1 - Moyen d'étanchéité d'une busette de coulée dans l'espace de coulée d'une machine continue à bande mouvante - Google Patents
Moyen d'étanchéité d'une busette de coulée dans l'espace de coulée d'une machine continue à bande mouvante Download PDFInfo
- Publication number
- EP0237478B1 EP0237478B1 EP87810106A EP87810106A EP0237478B1 EP 0237478 B1 EP0237478 B1 EP 0237478B1 EP 87810106 A EP87810106 A EP 87810106A EP 87810106 A EP87810106 A EP 87810106A EP 0237478 B1 EP0237478 B1 EP 0237478B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- belt
- sealing means
- casting
- means according
- 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
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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
- B22D11/0645—Sealing means for the nozzle between the travelling surfaces
Definitions
- the present invention relates to a sealing of a casting nozzle against the casting space of a continuous casting device according to the preamble of claim 1.
- a known continuous casting device of this type is characterized by a so-called casting wheel, which is provided with a wheel rim internally cooled by means of a liquid (US Pat. No. 3,429,363).
- This has a depression corresponding to the desired strand dimension to be cast over the circumference and forms three sides of the casting space with the edges of the depression on both sides.
- the fourth side is now formed by a metal band resting on the edges and partially wrapping around the wheel rim, hereinafter referred to as the mold band, which creates a closed casting space over the circumference of the strand cross section to be cast.
- the mold belt is usually endless and is guided and tensioned over deflection rollers in order to form a casting mold of the desired length for a given wheel diameter.
- the mold belt is intensively cooled on the outside over the entire length of the casting space by means of an aqueous liquid. If the casting wheel is rotated by a drive, the mold belt runs along, creating a mold running with the cast material.
- a similar continuous casting device with casting wheel is also known from FR-A 1 418 754.
- the mold belt is covered with rigid plates which rest on the two edges of the casting wheel in the area of the casting wheel and thus do not exert any defined pressure on the casting nozzle which grips between the casting wheel and the mold belt.
- a further known continuous casting device is characterized in that the casting space is formed by two circumferential mold belts which are opposite one another at a certain distance and so-called side dams arranged on both sides between them (US Pat. No. 2,904,860 or 3,036,348).
- Circulating, endless mold belts are usually provided, which are guided and tensioned over appropriate deflection rollers. If a casting operation with interruptions is permissible, mold strips unwinding from a bundle can also be used, which are wound again after passing through the casting section or fed to the further processing as a cover layer combined with the casting material (DE Patent No. 1 508 876).
- the heat given off by the cast material to the mold belt is dissipated by means of intensive cooling through an aqueous liquid on the back of the mold belt.
- the melt is fed into the casting chamber by means of a feed device in the direction of the mold movement, where solidification takes place as a result of the heat removal, after which, depending on the casting material, a completely or partially solidified strand emerges from the casting room.
- So-called open or closed feed systems are used. In the open system, the melt flows through a suitable trough into the casting chamber, the inflow of the melt being regulated in a known manner. If high demands are placed on the quality of the cast strand, only a closed feed system can be used.
- a so-called pouring nozzle is used to feed the melt into the casting chamber, which protrudes into the casting chamber and closes it backwards.
- the material of the pouring nozzle is adapted to the properties of the molten metal.
- the material used for this must meet the requirements in terms of temperature, thermal shock on first contact with the melt, heat conduction, erosion, chemical reaction with the melt, machinability and economy.
- ceramic materials are in the foreground, depending on the existing requirements of various types. For example, pouring nozzles made of ceramic fibers based on Si 0 2 and A1 2 0 3 impregnated, compressed and fired with binder and filler, aluminum titanate, graphite, bomitride, quartz are used.
- the gap width is usually on the order of 0.1 to 0.5 mm.
- the metallostatic pressure of the melt at the outlet of the nozzle must be regulated within narrow limits. With increasing pressure and / or decreasing viscosity or surface tension of the melt, the sealing becomes more and more important. It is now known to create an increased sealing effect by suitable shaping of the nozzle. Even with the measures described, however, the risk of flowing backwards and the associated consequences remains.
- the aim of the present invention is now, in the case of casting devices of the two types described at the outset, to create a perfect seal of the casting space across its width between the mold belt and the casting nozzle. This goal is achieved by the measures according to the characterizing part of claim 1.
- the contact pressure is therefore dimensioned such that the metallostatic pressure of the melt at the outlet of the nozzle cannot lift the mold belt from the latter.
- the height difference corresponds to the difference between the level height in the tundish and the height of the lower mold surface at the nozzle outlet.
- the bar advantageously extends over the entire casting width of the nozzle.
- the bar can be in one piece or divided into several individual parts of any length. Plastic, metal or ceramic can be used as the material.
- the bar preferably has a width of 8 to 12 mm and a height of the same order of magnitude.
- Fig. 3 shows a vertical arrangement of the casting device.
- Another possibility is to bypass the pistons and allow the pressure medium to act directly on the strip 14 with appropriate sealing.
- springs 15 (FIG. 1) or pistons 16 (FIG. 3) are used, these are provided at a suitable distance a (FIG. 2) and are dimensioned such that the mold belt does not deviate from the metallostatic pressure at the outlet of the nozzle Nozzle is lifted off.
- FIG. 4 shows this solution in a vertical orientation.
- a force component acts on the mold belt.
- the leakage of the coolant backwards can be kept within permissible limits by means of a labyrinth seal 22, wherein the leakage liquid can be collected in the housing of the device and returned to the coolant system.
- the liquid stream 20 emerging from the coolant nozzle at a high speed covers the gan with a corresponding cooling effect ze back surface of the mold belt.
- FIG. 5 An additional variant according to FIG. 5 is that the static liquid pressure prevailing in the chamber 18 acts on the mold belt and presses it against the casting nozzle.
- the coolant on the belt 13 flows directly from the pressurized chamber 18 through the subsequent coolant nozzle 19. Since the kinetic energy of the liquid flow is exhausted some distance after the nozzle exit, the coolant can be replaced in a known manner at regular intervals.
- the mold strips can also be pressed in that the mold strip is guided in such a way that it runs in a diverging direction in front of the mouth of the pouring nozzle with respect to the center line thereof and is deflected in the pouring nozzle on the pouring nozzle, as a result of the tension of the Mold belt is generated a force acting on the nozzle.
- 6 illustrates a solution of this type in that both opposing mold belts 13 are directed via guides 22, the distance a of which is less than the height h of the pouring nozzle. This results in a diverging direction of the mold strip 13 with respect to the center line C-C of the pouring nozzle 11. As a result of the tension in the circumferential direction thereof, a force F directed against the pouring nozzle results.
- rollers can also be provided.
- A is the cross section of a mold belt, a is the tensile stress in it and ⁇ is the deflection angle on the casting nozzle, then:
- the contact pressure can be adapted to the metallostatic pressure prevailing at the outlet of the nozzle in all of the solutions described above.
- cooling can also be done by spraying from nozzles arranged at short intervals or using so-called support heads, e.g. according to EP-A 0 148 384. Since a certain friction arises between the pouring nozzle and a mold belt using the present invention, it is advantageous to apply a wear-resistant layer to the friction point of the nozzle. This can be done by known methods using the flame or plasma spray technique by adding a 0.1 to 0.2 mm thick layer, e.g. made of aluminum oxide.
- the mouthpiece of the nozzle 11 is provided with inserted wear plates 12.
- Materials such as aluminum oxide, silicon carbide or nitride, metal carbides, etc. are suitable for this.
- One of the measures mentioned can prevent premature wear of the pouring nozzle.
- the Swiss patent no. 508 433 describes a pouring nozzle with inlays made of a self-lubricating material attached near the mouth.
- the inserts serve the purpose of guiding the mouthpiece between the rigid mold halves of a caterpillar mold in such a way that the nozzle surface does not come into contact with the mold, even claiming that the inserts protrude from the surface of the nozzle in order to provide a direct To prevent contact of the nozzle surface with the mold by providing a gap of 0.2 to 0.3 mm between the nozzle and the mold surface.
- a sealing effect can only be achieved with a low metallostatic pressure of at most 20 to 30 mm liquid aluminum column.
- the present invention essentially differs from the type and mode of operation in question, firstly, that the inlays do not protrude from the nozzle surface, secondly, that the inlays are as close as possible to the nozzle outlet, and thirdly, that the inlays are made of a hard, wear-resistant material, to increase the operating time of the nozzle under the condition that the mold belts are pressed against it, and to create an integrity seal between the nozzle and the mold belt at all metallostatic pressures in the casting chamber that occur practically even when pouring in increasing direction.
- the pressing and sealing device allows, in contrast to the usual known systems, the cooling of the mold belts only after the pressing or sealing point, directly at the mouth of the pouring nozzle 11, i.e. still in the area of the pouring nozzle between the pressing point and the mouth , can take place.
- the cooling starts directly at the mouth of the pouring nozzle 11.
- the orientation of the pouring device or the pouring process is arbitrary. Instead of horizontal or vertical, as shown, it could also be inclined or directed upwards.
- the seal according to the invention has the advantage in any case that it is possible to work with higher metallostatic pressures when the melt supply system is closed, be it that a relatively high pressure results as a result of the vertical arrangement, or that the level in the horizontal or upward pouring direction Tundish is higher than usual.
- the vertical arrangement also offers advantages with regard to symmetrical cooling and generally symmetrical conditions during the casting and solidification process. The higher casting pressure leads to a safe reflow of the melt in the solidification area and thus to a high-quality structure of the cast strip.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87810106T ATE43264T1 (de) | 1986-03-10 | 1987-02-23 | Abdichtung einer giessduese gegen den giessraum einer stranggiessvorrichtung mit mindestens einem umlaufenden, flexiblen kokillenband. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH97286 | 1986-03-10 | ||
CH972/86 | 1986-03-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0237478A1 EP0237478A1 (fr) | 1987-09-16 |
EP0237478B1 true EP0237478B1 (fr) | 1989-05-24 |
Family
ID=4199483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87810106A Expired EP0237478B1 (fr) | 1986-03-10 | 1987-02-23 | Moyen d'étanchéité d'une busette de coulée dans l'espace de coulée d'une machine continue à bande mouvante |
Country Status (8)
Country | Link |
---|---|
US (1) | US4785873A (fr) |
EP (1) | EP0237478B1 (fr) |
JP (1) | JP2593470B2 (fr) |
AT (1) | ATE43264T1 (fr) |
CA (1) | CA1293848C (fr) |
DE (1) | DE3760169D1 (fr) |
ES (1) | ES2008705B3 (fr) |
GR (2) | GR890300033T1 (fr) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3703997A1 (de) * | 1987-02-10 | 1988-08-18 | Mannesmann Ag | Vorrichtung zum stranggiessen von duennen straengen aus metall, insbesondere aus stahl |
CA2517447C (fr) * | 1994-07-19 | 2007-05-29 | Alcan International Limited | Processus et appareil de coulage d'une bande de metal, et injecteur connexe |
US5725046A (en) * | 1994-09-20 | 1998-03-10 | Aluminum Company Of America | Vertical bar caster |
US5687789A (en) * | 1995-12-28 | 1997-11-18 | Larex A.G. | Caster with improved coil changing system |
US5640868A (en) * | 1995-12-28 | 1997-06-24 | Larex A.G. | Apparatus and method for work hardening an endless belt for use in a belt caster |
US5787968A (en) * | 1995-12-28 | 1998-08-04 | Larex A.G. | Movably mounted side dam and an associated method of sealing the side dam against the nozzle of a belt caster |
US5671801A (en) * | 1996-01-11 | 1997-09-30 | Larex A.G. | Cooling system for a belt caster and associated methods |
US5778967A (en) * | 1996-01-11 | 1998-07-14 | Larex A.G. | Side dam for a caster having improved contact with solidifying metal |
US5711367A (en) * | 1996-01-11 | 1998-01-27 | Larex A.G. | Apparatus for delivering molten metal to a caster including wear strips |
US5613547A (en) * | 1996-01-11 | 1997-03-25 | Larex A.G. | Nozzle with a baffle for a caster and an associated method of casting molten metal |
US6173755B1 (en) | 1996-05-23 | 2001-01-16 | Aluminum Company Of America | Nozzle for continuous slab casting |
US5823246A (en) * | 1997-03-03 | 1998-10-20 | Larex A.G. | Tundish including a baffle for directing molten metal therethrough and an associated caster and method of casting molten metal |
US5967220A (en) * | 1997-03-25 | 1999-10-19 | Larex, A.G. | Caster including a gas delivery means to resist backflowing and freezing of molten metal to the tip of a nozzle |
DE102010046292A1 (de) | 2009-12-29 | 2011-06-30 | SMS Siemag AG, 40237 | Stranggießanlage und Verfahren zum Stranggießen |
DE102011078370A1 (de) | 2011-06-29 | 2013-01-03 | Sms Siemag Ag | Verfahren zum Stranggießen eines Gießstrangs und Stranggießanlage |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1418754A (fr) * | 1958-11-19 | 1965-11-26 | Pechiney Prod Chimiques Sa | Améliorations à la technique de la coulée continue |
CH416955A (de) * | 1964-04-20 | 1966-07-15 | Alusuisse | Verfahren und Maschine zum Stranggiessen von Metallen |
CH423109A (de) * | 1964-08-31 | 1966-10-31 | Alusuisse | Giessmaschine zur Herstellung von Bändern |
FR1435936A (fr) * | 1965-03-08 | 1966-04-22 | Siderurgie Fse Inst Rech | Procédé et dispositif de coulée continue de produits liquides |
US3429363A (en) * | 1966-04-14 | 1969-02-25 | Hazelett Strip Casting Corp | Method of cooling the casting belt in a continuous metal casting machine of the drum and belt type |
DE1758957A1 (de) * | 1968-09-07 | 1971-04-01 | Schloemann Ag | Stranggiesskokille |
CH508433A (de) * | 1970-06-24 | 1971-06-15 | Prolizenz Ag C O Schweiz Kredi | Düse für die Zuführung des geschmolzenen Metalles beim Bandgiessen in Raupenkokille |
US3933193A (en) * | 1971-02-16 | 1976-01-20 | Alcan Research And Development Limited | Apparatus for continuous casting of metal strip between moving belts |
US3937270A (en) * | 1973-11-09 | 1976-02-10 | Hazelett Strip-Casting Corporation | Twin-belt continuous casting method providing control of the temperature operating conditions at the casting belts |
JPS582735B2 (ja) * | 1974-07-30 | 1983-01-18 | 古河電気工業株式会社 | レンゾクチユウゾウソウチニオケル チユウユホウホウ |
DE3029223C2 (de) * | 1980-08-01 | 1984-09-27 | Fried. Krupp Gmbh, 4300 Essen | Einlauf für die Metallschmelze in Stranggießvorrichtungen |
JPS5820356A (ja) * | 1981-07-29 | 1983-02-05 | Mitsubishi Heavy Ind Ltd | 水平型連続鋳造装置 |
DE3231321C2 (de) * | 1982-08-23 | 1984-06-07 | Fried. Krupp Gmbh, 4300 Essen | Abdichtung zwischen einer Gießdüse und einer diese umschließenden Stranggießkokille für Stahl mit einem rechteckförmigen Gießquerschnitt |
JPS59153552A (ja) * | 1983-02-22 | 1984-09-01 | Nippon Kokan Kk <Nkk> | 薄肉鋳片の水平連続鋳造装置 |
DE3345982C2 (de) * | 1983-12-20 | 1985-11-14 | Fried. Krupp Gmbh, 4300 Essen | Einlauf für die Metallschmelze in Stranggießvorrichtungen, die eine feststehende feuerfeste Gießdüse und eine Kokille mit nur in Gießrichtung bewegten Kokillenwänden aufweisen |
-
1987
- 1987-02-23 EP EP87810106A patent/EP0237478B1/fr not_active Expired
- 1987-02-23 ES ES87810106T patent/ES2008705B3/es not_active Expired
- 1987-02-23 DE DE8787810106T patent/DE3760169D1/de not_active Expired
- 1987-02-23 AT AT87810106T patent/ATE43264T1/de not_active IP Right Cessation
- 1987-02-25 CA CA000530521A patent/CA1293848C/fr not_active Expired - Lifetime
- 1987-02-26 US US07/019,204 patent/US4785873A/en not_active Expired - Lifetime
- 1987-03-09 JP JP62053914A patent/JP2593470B2/ja not_active Expired - Fee Related
-
1989
- 1989-04-12 GR GR89300033T patent/GR890300033T1/el unknown
- 1989-08-23 GR GR89400154T patent/GR3000131T3/el unknown
Also Published As
Publication number | Publication date |
---|---|
JPS62214854A (ja) | 1987-09-21 |
GR890300033T1 (en) | 1989-04-12 |
ES2008705B3 (es) | 1989-08-01 |
JP2593470B2 (ja) | 1997-03-26 |
CA1293848C (fr) | 1992-01-07 |
US4785873A (en) | 1988-11-22 |
GR3000131T3 (en) | 1990-11-29 |
EP0237478A1 (fr) | 1987-09-16 |
DE3760169D1 (en) | 1989-06-29 |
ATE43264T1 (de) | 1989-06-15 |
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