EP0149164A2 - Busette de coulée consistant en plusieurs sections longitudinales pour conduire un métal liquide dans une lingotière de coulée continue et procédé de fabrication d'un bec d'une telle busette de coulée - Google Patents

Busette de coulée consistant en plusieurs sections longitudinales pour conduire un métal liquide dans une lingotière de coulée continue et procédé de fabrication d'un bec d'une telle busette de coulée Download PDF

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Publication number
EP0149164A2
EP0149164A2 EP84115539A EP84115539A EP0149164A2 EP 0149164 A2 EP0149164 A2 EP 0149164A2 EP 84115539 A EP84115539 A EP 84115539A EP 84115539 A EP84115539 A EP 84115539A EP 0149164 A2 EP0149164 A2 EP 0149164A2
Authority
EP
European Patent Office
Prior art keywords
mouthpiece
casting
support body
ceramic bodies
space
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
EP84115539A
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German (de)
English (en)
Other versions
EP0149164B1 (fr
EP0149164A3 (en
Inventor
Gerd Artz
Dieter Figge
Thomas Dr. Hoster
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.)
Fried Krupp AG
Original Assignee
Fried Krupp AG
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 Fried Krupp AG filed Critical Fried Krupp AG
Priority to AT84115539T priority Critical patent/ATE30865T1/de
Publication of EP0149164A2 publication Critical patent/EP0149164A2/fr
Publication of EP0149164A3 publication Critical patent/EP0149164A3/de
Application granted granted Critical
Publication of EP0149164B1 publication Critical patent/EP0149164B1/fr
Expired legal-status Critical Current

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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
    • B22D11/0642—Nozzles

Definitions

  • Casting nozzle consisting of several longitudinal sections for feeding molten metal into a continuous casting mold and method for producing the mouthpiece of such a casting nozzle
  • the invention relates to a casting nozzle consisting of a plurality of longitudinal sections for supplying molten metal, in particular steel melt, into a continuous casting mold with a rectangular mold space delimiting and there moving exclusively in the casting direction, the mold part of which, adapted in cross section, protrudes on part of its longitudinal extent into the mold space hollow support body made of amorphous silica and, supported on this, a hollow mouth body made of boron nitride, the latter forming part of the wall of the mouthpiece bore and the end face located there in the end region of the mouthpiece up to its outlet opening, and a method for producing the mouthpiece of such a body Pouring nozzle.
  • the mold walls of a continuous casting mold of the type mentioned at the outset - apart from the known embodiments which are equipped with casting wheels - consist of opposing continuous casting belts in pairs and of adjoining side dams adjoining these, which together form the mold space; the pouring nozzle forming a feed tube partially projects into this, forming a sealing point, for example in the form of a narrow sealing gap (DE-OS 30 29 223).
  • the pouring nozzle is made more difficult by the fact that the space in the area of the surrounding mold walls is narrow and that, in view of the self-supporting design of the pouring nozzle, the weight forces emanating from the mouthpiece and possibly further longitudinal sections must be absorbed by means of a suitable connection .
  • the pouring nozzle must have a high degree of strength, in particular in the area of the sides, in view of the shock and friction loads that occur during operation, and one with less in terms of the seal (ie in view of the narrow sealing gap to be set) Tolerance manufactured outer shape and with consideration of a good heat flow and to prevent unwanted solidification from suitable materials. Therefore, the mouthpiece should at least in the vicinity of its outlet opening - to avoid the aforementioned solidification and to facilitate sealing - consist of a ceramic material with low wettability with respect to the molten metal, namely boron nitride.
  • the invention has for its object to design a pouring nozzle of the type mentioned in such a way that it in the area of its mouthpiece, in particular in the end region of the mouthpiece, while observing the required operational safety and without expensive traction elements and optionally tensioning devices, taking advantage of the advantageous properties of Boron nitride can be produced. Furthermore, a preferred method is to be specified with which the mouthpiece of a pouring nozzle of the type in question can be produced.
  • the object is achieved by a casting nozzle which has the features of claim 1.
  • the basic idea of the invention is to produce the mouthpiece by pouring the supporting body made of amorphous silica onto the mouth body made of boron nitride in such a way that between them there is a connection which is movable to a limited extent, but cannot be released by positive locking.
  • the mobility causing, production-related gap-shaped intermediate space is filled eramik emotions the mutual positional securing of the two K with a sealing compound which has plastic properties at higher temperatures.
  • the unit present after casting on the support body must be such that between the an entanglement that is effective on all sides occurs for both reratnik bodies to be connected; In addition, it must be ensured that different changes in the dimensions of the two ceramic bodies, in particular when the cast-on supporting body dries and when molten metal is fed into the continuous casting mold, do not lead to damage or destruction.
  • the plastic sealing compound As sealing compound which solidifies at low temperatures after being filled into the intermediate space and has a doughy state in the temperature range between about 1100 to 1500 ° C., one which is particularly suitable is one whose essential constituents - ordered by the size of the proportions - Si0 2 , A1 2 0 3 , B 2 O 3 , CaO, Na 2 0 and K 2 0.
  • the plastic sealing compound preferably has the following composition: SiO 2 - 60%; Al 2 O 3 - 14%; B 2 0 3 - 10%; CaO- 7%; Na 2 O - 5% and K 2 O - 4%.
  • a casting nozzle mouthpiece can be produced in the casting process, which is a composite construction of amorphous silica and boron nitride.
  • the supporting body serving as the supporting element permits perfect mortaring of the mouthpiece with the longitudinal section of the pouring nozzle preceding in the pouring direction.
  • the outer wall of the mouthpiece is ground to comply with the required narrow dimensional and angle tolerances. For reasons of cost savings, the muzzle body attached to the cast-on supporting body is dimensioned as short as possible.
  • the mouthpiece can have an internal or external mouth body: this is either held in the supporting body that partially surrounds it or forms a covering of the supporting body on the rear part of the longitudinal extension in the casting direction. Regardless of the two design options, the ceramic body on the outside in the overlap area is included Filling openings for the sealing compound equipped (claim 2).
  • the non-detachable positive connection between the two ceramic bodies can be realized in that they engage with one another via at least two heel surfaces effective in the axial direction (claim 3).
  • the two ceramic bodies intermesh with one another via a thickening which is semicircular in cross section (claim 4); this preferably forms the rear end region of the inner support body in the casting direction.
  • the subject of the invention can be further developed in that the mouth body held in the support body, projecting axially as an extension thereof, also forms part of the outer surface of the mouthpiece (claim 5).
  • the pouring nozzle mouthpiece can also have a mouth body which encloses the support body on the rear part of its longitudinal extent in the casting direction and, projecting beyond it in the axial direction, forms part of the outer surface of the mouthpiece (claim 6).
  • the inventive method for producing the mouthpiece of a pouring nozzle in composite construction using boron nitride and amorphous silica is that the supporting body is cast onto the prefabricated mouthpiece in such a way that after the drying and firing process following the casting process, a gap-shaped process is formed There is an inseparable positive connection between the two ceramic bodies; the space is filled with a plastic sealant at higher temperatures (claim 7).
  • the method just mentioned can be carried out in a particularly simple manner if the support body - at least over part of the longitudinal extent of the mouth body - is poured into it.
  • the support body undergoes a change in dimension due to shrinkage, which - without fear of damage to the prefabricated mouthpiece - leads to the formation of the space between the two ceramic bodies held together.
  • the sealing compound filled into the intermediate space at a later time ensures that the different expansion of the two ceramic bodies can be absorbed by the mouthpiece without damage during the casting process.
  • the mouth body is coated with a flexible covering, in particular made of plastic, in the area facing it before the casting is cast on. This is expediently such that it is eliminated by gasification during the burning process (claim 8).
  • the method according to the invention is advantageously designed such that the mouth body is covered with a resilient intermediate layer on the end face which faces the support body to be cast. This creates a gap during casting, which ensures the freedom of movement that may be required for the shrinking process of the supporting body.
  • the advantage associated with the use of the intermediate layer also consists in the fact that it can be removed from the outside before the firing process and therefore does not have to be resolvable in the same way as the flexible covering (claim 9).
  • the pouring nozzle mouthpiece 1 which adjoins a further longitudinal section of the pouring nozzle, which is not shown, steel melt is fed in the direction of arrow 2 into the mold space 3, which is rectangular in cross-section, to a continuous casting mold with mold walls moving exclusively in the casting direction in the direction of arrow 2, avoiding air access.
  • these consist of two endless casting belts 4 lying opposite one another in pairs, which move in the direction of the arrows 4 ′ in accordance with the casting direction, and laterally adjoining these endless side dams, which are made up of individually interconnected individual blocks 5 made of a copper alloy are building.
  • the longitudinal axis 1 'of the mouthpiece 1 coincides with the longitudinal axis 3' of the mold space, in which the casting strand moved in the direction of arrow 2 is formed by gradual solidification.
  • the mold walls (parts 4 and 5) and the end region of the mouthpiece 1 "which cooperates with them in front of the outlet opening 1" are assigned to one another and designed such that there is a narrow sealing gap 6 between them during the casting process, which prevents the escape of molten metal against the casting direction and which is normally only a few tenths of a millimeter.
  • the mouthpiece 1 is consequently likewise rectangular in cross section, its broad sides (located above and below in FIG. 1) having the casting belts 4 consisting of a steel band and its (shown in FIG. 2) Narrow sides opposite the individual blocks 5.
  • connection area 1 "'on the left-hand side of the mouthpiece 1 is designed such that it can be connected to a longitudinal section of the pouring nozzle preceding in the pouring direction using sealing mortar; for this purpose the mouthpiece bore 7 is equipped with a suitable extension 7' on the left .
  • the mouthpiece 1 has, as an essential component, a hollow support body 8, which is made of amorphous silica (Si0 2 ). This only accommodates an internal mouth body 9 made of boron nitride in the end region of the mouthpiece, which part of the mouthpiece bore and the end face at the outlet opening 1 . forms.
  • the muzzle body is otherwise via an inner shoulder 9 'and an outer shoulder 9 "(which also includes the aforementioned end face at the outlet opening 1") with freedom of movement, but is inextricably linked to the support body 8; with its external heel 9 "it projects axially over the End edge 8 'of the supporting body.
  • the associated heel surface 9 "'forms the part of the outer wall of the mouthpiece in the extension of the outer wall 8" of the mouthpiece, in which the seal between the mouthpiece and the moving mold walls (parts 4 and 5) is brought about.
  • the sealant has approximately the following composition: 60% SiO 2 , 14% Al 2 O 3 , 10% B 2 O 3 , 7% CaO, 5% Na 2 0 and 4% K 2 0.
  • the sealing compound is required in the embodiment in question (FIGS. 1 and 2) with an internal mouth body 9 for manufacturing reasons: the support body cast onto the mouth body experiences a not inconsiderable shrinkage during the drying process following the casting process; this would with some probability lead to at least damage to the two mutually overlapping ceramic bodies 8 and 9, unless the shrinking process is taken into account from the outset.
  • care must be taken to ensure that an intermediate that enables the shrinkage of the support body between the two ceramic bodies space 10 exists, which will later be filled with the sealing compound 11 already mentioned.
  • This is injected through filler openings 12 (see FIG. 2), which are expediently arranged on the narrow sides of the mouthpiece 1 and are at a greater distance from the outlet opening 1 "and in front of the heel surface 9" 1 .
  • the mouthpiece bore 7 is designed in such a way that its wall 7 "- seen in the casting direction (arrow 2) in each case - has a different course on the broad and narrow sides of the mouthpiece.
  • the wall 7" is on the broad sides (cf. FIG. 1). only curved in the area of the internal mouth body 9 in such a way that there is an expansion of the mouthpiece bore 7 in the casting direction.
  • the wall 7 "- apart from the connection area 1" 'on the left side of the mouthpiece - is curved over the entire length, with the result that the mouthpiece bore 7 also extends outside the mouth body 9 extended in the casting direction.
  • the advantage of the embodiment according to FIGS. 1 and 2 is, in particular, that a simple and reliable arrangement can be produced by casting the resistant supporting body made of silica onto the expensive muzzle body made of boron nitride, in which additional and possibly failure-prone fastening elements are omitted.
  • the mouth body can not detach from the supporting body surrounding it.
  • the outer wall of the mouthpiece consists in the area in which the narrow sealing gap between the parts 1 and 4, 5 which are moved relative to one another is made of the ceramic material of the mouth body 9, ie of a ceramic material with a low wettability with regard to the molten steel.
  • the embodiment of the pouring nozzle mouthpiece 1 according to FIGS. 3 to 5 has an external mouth body 9, which surrounds the support body 8 with its outer surface 9 on the rear part of its longitudinal extension in the casting direction (arrow 2), projecting beyond it in the axial direction "" in extension of the outer wall 8 "forms a larger part of the outer surface of the mouthpiece.
  • the form-fitting connection preventing a separation of the two ceramic bodies 8 and 9 consists of a thickening 8 ′′ ′′ of the supporting body which is semicircular in cross section, which at the same time forms its rear edge in the casting direction.
  • the non-detachable positive connection between the ceramic bodies 8 and 9 is formed by the internal shoulder 9 'which has shoulder surfaces 9a and 9b inclined with respect to the longitudinal axis 1' of the mouthpiece.
  • the outer contour of the support body 8 is designed accordingly.
  • the gap-shaped intermediate space 10 filled with the sealing compound 11 in the case of the embodiments according to FIGS. 3 to 5 is due to the fact that the support body 8 cast onto the mouth body 9 undergoes the shrinkage already mentioned during the drying process.
  • the mouthpiece 9 which is in its raw state, is inserted into a steel support mold 13 which is open at the top and into which an outer mold 14 made of plaster and a one-piece plaster core 15 are also introduced.
  • the parts 13 and 15 engage in the raw bore of the orifice body 9 and prevent the silica present as a slip from entering this area.
  • the steel support mold 13 is closed by means of a cover 16 with a filling opening 16 ′, which is supported at the same time on the parts 14 and 15 and ensures their mutual position within the steel support mold 13.
  • the intermediate shape which is delimited by the parts 16, 14, 9 and 15, defines the raw shape of the support body 8 to be cast onto the mouth body 9.
  • the orifice body 9 is, before the slip is poured into the casting mold, in the region which will later be opposite the support body 8. covered with a resilient casing 17 which gasifies during firing and thus creates the space which allows the shrinkage of the support body 8 when drying and by which the mouth body 9 expands when fired with respect to the support body surrounding it.
  • the flexible sheath which can consist in particular of a dissolvable plastic, must therefore be with regard I l its strength be such that it can absorb 8 and 9 occurring during T rocknungs- and firing different dimensional changes of the ceramic body.
  • the gap-shaped space present after the firing process (cf. the embodiments according to FIGS. 2 and 2) is filled in the manner already described.
  • the unit mentioned is subjected to a firing process at approximately 1100 ° C., which ver gasifies the casing and forms the space between the two bonded ceramic bodies has the result:
  • the inner mouth body can therefore move to a small extent with respect to the supporting body that partially surrounds it in the longitudinal direction.
  • the gaseous reaction product of the casing escapes through bores which are arranged on at least one of the two ceramic bodies.
  • Styrene polymer or styrene copolymer can be used in particular as the covering, which is glued to the muzzle if necessary.
  • the casting molds shown in FIGS. 7 and 8 are intended to enable the production of a casting nozzle mouthpiece with an external mouth body 9.
  • the casting mold according to FIG. 7 has a one-piece gypsum core 15, the outer contour of which approximately corresponds to the course of the later mouthpiece bore 7 (cf. FIGS. 3 and 4).
  • a flexible intermediate layer 18 can be provided at most in the region of the front end 9c of the mouth body in the casting direction in order to avoid the risk of damage the ceramic bodies 8 and 9 hooked together via the thickening 8 ′′.
  • the intermediate layer 18 may after the removal of the K eramik stresses 8 and 9 from the gypsum core 15, but in any case be removed from the outside prior to the firing process.
  • the intermediate layer 18 must therefore be sufficiently flexible, but not be able to be resolved by the firing process.
  • the gap-like space between the ceramic bodies 8 and 9 that is created during the drying process is reduced to a certain extent during the firing process in that the boron nitride of the mouth body 9 expands more than the silica of the support body 8.
  • the casting mold according to FIG. 8 differs from the casting mold just described in that the plaster core has a plurality of core parts 15, 15a and 15b which can be detached from one another.
  • the gypsum core can consequently be removed from the mold without the raw mouthpiece with the ceramic bodies 9 and 8 having to be removed; the same applies to the outer shape 14.
  • the intermediate layer is accessible from the outside, it can be removed without difficulty at a suitable time.
  • the intermediate layer can be removed before the two movably connected ceramic bodies are fired at 1100 ° C. After the mouthpiece has cooled, the space between the two ceramic bodies is filled with the glaze-like sealing compound mentioned above, which only becomes dough-plastic at higher temperatures and creates a flexible seal between the two ceramic bodies.
  • the intermediate layer which may be used can consist of the same plastic as the covering which is used in the manufacture of a mouthpiece with an internal mouth body. Since the intermediate layer can be removed from the outside before the firing process, however, other plastics can also be used which do not have to be convertible into a gaseous state.
  • the advantage achieved by the invention is that by casting a support body onto an already prefabricated mouth made of boron nitride Lets produce unit, the components of which are permanently attached to one another via a positive connection.
  • the intermediate space between the two ceramic bodies hooked together in terms of production technology can be filled in a simple manner with a sealing compound that solidifies at low temperatures before the mouthpiece is subjected to the finishing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Casting Devices For Molds (AREA)
  • Ceramic Products (AREA)
  • Continuous Casting (AREA)
EP84115539A 1984-01-13 1984-12-15 Busette de coulée consistant en plusieurs sections longitudinales pour conduire un métal liquide dans une lingotière de coulée continue et procédé de fabrication d'un bec d'une telle busette de coulée Expired EP0149164B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84115539T ATE30865T1 (de) 1984-01-13 1984-12-15 Aus mehreren laengsabschnitten bestehende giessduese zum zufuehren von metallschmelze in eine stranggiesskokille und verfahren zur herstellung des mundstuecks einer derartigen giessduese.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3401024A DE3401024C2 (de) 1984-01-13 1984-01-13 Aus mehreren Längsabschnitten bestehende Gießdüse zum Zuführen von Metallschmelze in eine Stranggießkokille und Verfahren zur Herstellung des Mundstücks einer derartigen Gießdüse
DE3401024 1984-01-13

Publications (3)

Publication Number Publication Date
EP0149164A2 true EP0149164A2 (fr) 1985-07-24
EP0149164A3 EP0149164A3 (en) 1985-08-21
EP0149164B1 EP0149164B1 (fr) 1987-11-19

Family

ID=6224904

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84115539A Expired EP0149164B1 (fr) 1984-01-13 1984-12-15 Busette de coulée consistant en plusieurs sections longitudinales pour conduire un métal liquide dans une lingotière de coulée continue et procédé de fabrication d'un bec d'une telle busette de coulée

Country Status (3)

Country Link
EP (1) EP0149164B1 (fr)
AT (1) ATE30865T1 (fr)
DE (1) DE3401024C2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2257383A (en) * 1991-06-26 1993-01-13 Morganite Thermal Ceramics Ltd Duct for conveying molten metal
US5755274A (en) * 1993-05-18 1998-05-26 Pechiney Rhenalu Strip casting plant for metals
WO2000032337A1 (fr) * 1998-11-27 2000-06-08 Didier-Werke Ag Ameliorations concernant des produits refractaires
CN116943552A (zh) * 2023-07-20 2023-10-27 中国工程物理研究院激光聚变研究中心 一种Ta2O5气凝胶原位成型模具

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2398565A1 (fr) * 1977-07-27 1979-02-23 Scal Gp Condit Aluminium Busette d'alimentation en metal liquide pour machine de coulee continue de bande
DE3029223C2 (de) * 1980-08-01 1984-09-27 Fried. Krupp Gmbh, 4300 Essen Einlauf für die Metallschmelze in Stranggießvorrichtungen
DE3037059A1 (de) * 1980-10-01 1982-04-29 Böhler AG, 4000 Düsseldorf Stranggussvorrichtung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2257383A (en) * 1991-06-26 1993-01-13 Morganite Thermal Ceramics Ltd Duct for conveying molten metal
US5755274A (en) * 1993-05-18 1998-05-26 Pechiney Rhenalu Strip casting plant for metals
WO2000032337A1 (fr) * 1998-11-27 2000-06-08 Didier-Werke Ag Ameliorations concernant des produits refractaires
CN116943552A (zh) * 2023-07-20 2023-10-27 中国工程物理研究院激光聚变研究中心 一种Ta2O5气凝胶原位成型模具

Also Published As

Publication number Publication date
EP0149164B1 (fr) 1987-11-19
DE3401024A1 (de) 1985-07-25
ATE30865T1 (de) 1987-12-15
DE3401024C2 (de) 1986-01-16
EP0149164A3 (en) 1985-08-21

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