EP0320681A2 - Starter bar head for a steel band casting machine - Google Patents

Starter bar head for a steel band casting machine Download PDF

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Publication number
EP0320681A2
EP0320681A2 EP88119732A EP88119732A EP0320681A2 EP 0320681 A2 EP0320681 A2 EP 0320681A2 EP 88119732 A EP88119732 A EP 88119732A EP 88119732 A EP88119732 A EP 88119732A EP 0320681 A2 EP0320681 A2 EP 0320681A2
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EP
European Patent Office
Prior art keywords
cooling
connecting element
joints
mold
casting machine
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
EP88119732A
Other languages
German (de)
French (fr)
Other versions
EP0320681A3 (en
EP0320681B1 (en
Inventor
Manfred Kolakowski
Rainer Golla
Egon Foermer
Rolf Padberg
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.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
Schloemann Siemag 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 SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Priority to AT88119732T priority Critical patent/ATE62617T1/en
Publication of EP0320681A2 publication Critical patent/EP0320681A2/en
Publication of EP0320681A3 publication Critical patent/EP0320681A3/en
Application granted granted Critical
Publication of EP0320681B1 publication Critical patent/EP0320681B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D11/08—Accessories for starting the casting procedure
    • B22D11/081—Starter bars
    • B22D11/083—Starter bar head; Means for connecting or detaching starter bars and ingots

Definitions

  • the invention relates to a start-up head for a steel strip caster for introduction into the mold, on which an upper cooling and connecting element is arranged, which is provided with spaced-apart projections which form a positive connection with the solidifying metal melt.
  • a start-up head of the aforementioned type is known, a cooling and connecting element being fastened by screws to a start-up head which is connected to a start-up line. Mushroom-like projections are molded onto the top of the cooling and connecting element and are cast around them by the inflowing steel melt. Due to strong cooling, the melt solidifies in the area of the cooling and connecting element immediately to form a compact, form-fitting connecting unit.
  • the object of the invention is to provide a start-up head for a steel strip casting installation, shrinkage cracks at the beginning of the casting strip being avoided.
  • the beginning of the cast strip and the cooling and connecting element are subject to opposite temperature profiles.
  • the cooling and connecting element which is coldly introduced into the mold, is continuously heated by the molten steel and the solidifying beginning of the strip and consequently expands.
  • the beginning of the strip is cooled further by applying cooling water and attempts to shrink. Since the shrinkage is blocked by the compact connection to the expanding cooling and connecting element, harmful shrinkage cracks occur in the longitudinal direction of the beginning of the strip.
  • the object of the invention in the generic starting line is achieved in that the cooling and connecting element is divided between at least two projections by shrinking joints which are sealed against the melt.
  • the cooling and connecting element and the start-up head are displaceably connected in the longitudinal direction of their contact surfaces in the sense of reducing the shrinkage joints.
  • the width of the shrink joints is advantageously determined and filled by a fireproof fleece.
  • the width of the shrink joints can advantageously be about 20 mm.
  • a U-shaped cover profile can be pushed onto the cooling and connecting element.
  • two opposite broad side walls 1, 2 and two narrow side walls 3, 4 arranged between parallel side regions of the wide side walls 1, 2 form the molding space.
  • the broad side walls 1, 2 and the narrow side walls 3, 4 are provided with channels 5.
  • the broad side walls 1, 2 form an enlarged pouring area 6 into their center into which a pouring tube 7 projects.
  • a start-up head consisting of a lower part 8 and a multi-part cooling and connecting element 9a, 9b, 9c in the lower part of the mold.
  • the lower part 8 of the start-up head connected to a pull-out element 10 fills the mold with little play.
  • the flat gasket 11, which is formed of a matt mat, has a slight protrusion from the mold opening, so that an all-round sealing system is ensured within the mold.
  • the three-part cooling and connecting element 9a, 9b, 9c is placed, which has an all-round distance to the mold walls 1, 2, 3, 4 and is provided with mushroom-like projections 13 on its top. Screws 15 are held with their heads in transverse grooves 14 of the lower part 8, by means of which nuts 16 hold the flat gasket 11, steel plate 12 and cooling and connecting element 9a, 9b, 9c provided with corresponding bores.
  • shrink joints 18 which are filled with refractory ceramic fleece 19.
  • the shrink joints 18 have a width of 20 mm.
  • the screw passage openings are designed as elongated holes 17, so that its parts 9a, 9b, 9c follow the shrinkage of the beginning of the cast strip in the sense of a reduction in the shrinkage joints 18 and a relative movement with respect to the lower part 8 of the starting head is possible.
  • U-shaped covers 20 are pushed over the cooling and connecting element 9a, 9b, 9c in the area of the shrink joints.
  • the profile wall of the covers 20 is 3-5 mm, with a small gap being present to the mold wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Coating With Molten Metal (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Braking Arrangements (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

An upper cooling and connecting element with mutually spaced projections is attached to a starter bar head for insertion into the mould of a steel band casting machine. To avoid shrinkage cracks in the start of the cast band, the cooling and connecting element (9a, 9b, 9c) is divided by contraction joints (18) between at least two projections (13). The contraction joints are sealed off against the melt. <IMAGE>

Description

Die Erfindung betrifft einen Anfahrkopf für eine Stahlband­gießanlage zur Einführung in die Kokille, an dem ein oberes Abkühl- und Verbindungselement angeordnet ist, das mit im Abstand zueinander angeordneten Vorsprüngen versehen ist, die mit der erstarrenden Metallschmelze eine formschlüssige Verbindung eingehen.The invention relates to a start-up head for a steel strip caster for introduction into the mold, on which an upper cooling and connecting element is arranged, which is provided with spaced-apart projections which form a positive connection with the solidifying metal melt.

Durch die DE-OS 36 03 190 ist ein Anfahrkopf der vorge­nannten Gattung bekannt, wobei ein Abkühl- und Verbindungs­element durch Schrauben auf einem Anfahrkopf befestigt ist, der mit einem Anfahrstrang verbunden ist. An der Oberseite des Abkühl- und Verbindungselements sind pilzartige Vor­sprünge angeformt, die von der einströmenden Stahlschmelze umgossen werden. Durch starke Abkühlung erstarrt die Schmelze im Bereich des Abkühl- und Verbindungselements sofort unter Bildung einer kompakten, formschlüssigen Verbindungseinheit.From DE-OS 36 03 190 a start-up head of the aforementioned type is known, a cooling and connecting element being fastened by screws to a start-up head which is connected to a start-up line. Mushroom-like projections are molded onto the top of the cooling and connecting element and are cast around them by the inflowing steel melt. Due to strong cooling, the melt solidifies in the area of the cooling and connecting element immediately to form a compact, form-fitting connecting unit.

Bei einem derartig ausgebildeten Anfahrkopf wird bei bestimmten Stahlsorten der Gußbandanfang durch Schrumpfrisse geschädigt, so daß Teile des Bandes als Ausschuß abgetrennt werden müssen.In the case of a starting head designed in this way, the beginning of the cast strip is damaged by shrinkage cracks in certain types of steel, so that parts of the strip must be separated as rejects.

Aufgabe der Erfindung ist die Schaffung eines Anfahrkopfes für eine Stahlbandgießanlage, wobei Schrumpfrisse im Guß­bandanfang vermieden werden.The object of the invention is to provide a start-up head for a steel strip casting installation, shrinkage cracks at the beginning of the casting strip being avoided.

Vor der Lösung der gestellten Aufgabe stand die Erkenntnis, daß der Gußbandanfang und das Abkühl- und Verbindungselement entgegengesetzten Temperaturverläufen unterliegen. Das kalt in die Kokille eingeführte Abkühl- und Verbindungselement wird durch die Stahlschmelze und den erstarrenden Bandanfang kontinuierlich erwärmt und dehnt sich infolgedessen aus. Dem­ gegenüber wird der Bandanfang nach seiner Erstarrung durch die Kokillenwände und außerhalb der Kokille durch Kühl­wasserbeaufschlagung weiter abgekühlt und versucht zu schrumpfen. Da das Schrumpfen durch die kompakte Ver­bindung zum sich dehnenden Abkühl- und Verbindungselement blockiert wird, entstehen schädliche Schrumpfrisse in Längs­richtung des Bandanfangs.Before the problem was solved, the knowledge was found that the beginning of the cast strip and the cooling and connecting element are subject to opposite temperature profiles. The cooling and connecting element, which is coldly introduced into the mold, is continuously heated by the molten steel and the solidifying beginning of the strip and consequently expands. The on the other hand, after it has solidified through the mold walls and outside the mold, the beginning of the strip is cooled further by applying cooling water and attempts to shrink. Since the shrinkage is blocked by the compact connection to the expanding cooling and connecting element, harmful shrinkage cracks occur in the longitudinal direction of the beginning of the strip.

Hiernach wird die Aufgabe der Erfindung bei dem gattungs­gemäßen Anfahrstrang dadurch gelöst, daß das Abkühl- und Verbindungselement zwischen mindestens zwei Vorsprüngen durch Schrumpffugen unterteilt ist, die gegen die Schmelze abgedichtet sind.According to this, the object of the invention in the generic starting line is achieved in that the cooling and connecting element is divided between at least two projections by shrinking joints which are sealed against the melt.

Auf diese Weise können die Abschnitte des Abkühl- und Verbindungselements der Schrumpfung des Gußbandanfangs folgen. Schrumpfrisse im Bandanfang werden vermieden.In this way the sections of the cooling and connecting element can follow the shrinkage of the beginning of the cast strip. Shrinkage cracks at the beginning of the strip are avoided.

Gemäß einem weiteren Merkmal der Erfindung ist das Abkühl- und Verbindungselement und der Anfahrkopf in Längsrichtung ihrer Kontaktflächen im Sinne einer Verkleinerung der Schrumpffugen verschiebbar verbunden.According to a further feature of the invention, the cooling and connecting element and the start-up head are displaceably connected in the longitudinal direction of their contact surfaces in the sense of reducing the shrinkage joints.

Die Schrumpffugen sind vorteilhaft durch ein feuerfestes Vliess in ihrer Weite bestimmt und ausgefüllt. Die Weite der Schrumpffugen kann vorteilhaft etwa 20 mm betragen.The width of the shrink joints is advantageously determined and filled by a fireproof fleece. The width of the shrink joints can advantageously be about 20 mm.

Zur Abdeckung der Schrumpffugen gegen die Stahlschmelze kann ein U-förmiges Abdeckprofil passend auf das Abkühl- und Verbindungselement geschoben werden.To cover the shrink joints against the molten steel, a U-shaped cover profile can be pushed onto the cooling and connecting element.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigen

  • Fig. 1 eine Innenansicht einer Stahlbandgießkokille in Richtung einer Breitseitenwand mit Schmalseiten­wänden und Anfahrkopf,
  • Fig. 2 einen Anfahrkopf in alternativer Ausführung und
  • Fig. 3 einen Querschnitt der Stahlbandgießkokille gemäß der Linie III - III in Fig. 1.
In the drawing, an embodiment of the invention is shown. Show it
  • 1 is an interior view of a steel strip casting mold in the direction of a broad side wall with narrow side walls and starting head,
  • Fig. 2 shows a starting head in an alternative embodiment and
  • 3 shows a cross section of the steel strip casting mold along the line III-III in FIG. 1.

Bei der dargestellten Stahlbandgießkokille bilden zwei gegenüberliegende Breitseitenwände 1, 2 und zwei zwischen parallelen Seitenbereichen der Breitseitenwände 1, 2 an­geordnete Schmalseitenwände 3, 4 den Formraum. Zur Kühlung sind die Breitseitenwände 1, 2 und die Schmalseitenwände 3, 4 mit Kanälen 5 versehen. Die Breitseitenwände 1, 2 formen zu ihrer Mitte einen erweiterten Eingießbereich 6 in den ein Gießrohr 7 hineinragt.In the steel strip casting mold shown, two opposite broad side walls 1, 2 and two narrow side walls 3, 4 arranged between parallel side regions of the wide side walls 1, 2 form the molding space. For cooling, the broad side walls 1, 2 and the narrow side walls 3, 4 are provided with channels 5. The broad side walls 1, 2 form an enlarged pouring area 6 into their center into which a pouring tube 7 projects.

Zum Verschließen der Kokille und als Auszugsverbindung befindet sich im unteren Teil der Kokille ein aus einem Unterteil 8 und einem mehrteiligen Abkühl- und Verbindungs­element 9a, 9b, 9c bestehender Anfahrkopf.To close the mold and as a pull-out connection there is a start-up head consisting of a lower part 8 and a multi-part cooling and connecting element 9a, 9b, 9c in the lower part of the mold.

Der mit einem Auszugselement 10 verbundene Unterteil 8 des Anfahrkopfes füllt die Kokille mit geringem Spiel aus. Auf der ebenen Oberfläche des Unterteils 8 liegt eine Flach­dichtung 11, die durch eine dem Format des Unterteils 8 entsprechende Stahlplatte 12 gehalten ist. Die als Keramik­ fasermatte ausgebildete Flachdichtung 11 weist einen ge­ringen Überstand gegenüber der Kokillenöffnung auf, so daß innerhalb der Kokille eine allseitig dichtende Anlage gewährleistet ist.The lower part 8 of the start-up head connected to a pull-out element 10 fills the mold with little play. On the flat surface of the lower part 8 there is a flat seal 11 which is held by a steel plate 12 corresponding to the format of the lower part 8. The as ceramics The flat gasket 11, which is formed of a matt mat, has a slight protrusion from the mold opening, so that an all-round sealing system is ensured within the mold.

Auf der Stahlplatte 12 ist das dreiteilige Abkühl- und Ver­bindungselement 9a, 9b, 9c aufgesetzt, das einen allseitigen Abstand zu den Kokillenwänden 1, 2, 3, 4 hat und an seiner Oberseite mit pilzartigen Vorsprüngen 13 versehen ist. In Quernuten 14 des Unterteils 8 sind Schrauben 15 mit ihren Köpfen gehalten, durch die mit entsprechenden Bohrungen versehenen Flachdichtung 11, Stahlplatte 12 und Abkühl- und Verbindungselement 9a, 9b, 9c mittels Muttern 16 ge­halten sind.On the steel plate 12, the three-part cooling and connecting element 9a, 9b, 9c is placed, which has an all-round distance to the mold walls 1, 2, 3, 4 and is provided with mushroom-like projections 13 on its top. Screws 15 are held with their heads in transverse grooves 14 of the lower part 8, by means of which nuts 16 hold the flat gasket 11, steel plate 12 and cooling and connecting element 9a, 9b, 9c provided with corresponding bores.

Zwischen den Teilen 9a, 9b, 9c des Abkühl- und Verbindungs­elements befinden sich Schrumpffugen 18, die durch feuer­festes Keramikvliess 19 ausgefüllt sind. Die Schrumpffugen 18 haben eine Weite von 20 mm. Im Abkühl- und Verbindungs­element 9a, 9b, 9c sind die Schraubendurchgangsöffnungen als Langlöcher 17 ausgebildet, damit dessen Teile 9a, 9b, 9c der Schrumpfung des Gußbandanfangs im Sinne einer Ver­kleinerung der Schrumpffugen 18 folgen und eine Relativ­bewegung gegenüber dem Unterteil 8 des Anfahrkopfes möglich ist.Between the parts 9a, 9b, 9c of the cooling and connecting element there are shrink joints 18 which are filled with refractory ceramic fleece 19. The shrink joints 18 have a width of 20 mm. In the cooling and connecting element 9a, 9b, 9c, the screw passage openings are designed as elongated holes 17, so that its parts 9a, 9b, 9c follow the shrinkage of the beginning of the cast strip in the sense of a reduction in the shrinkage joints 18 and a relative movement with respect to the lower part 8 of the starting head is possible.

Zum Schutz gegen die Stahlschmelze sind im Bereich der Schrumpffugen U-förmige Abdeckungen 20 über das Abkühl- und Verbindungselement 9a, 9b, 9c geschoben. Die Profil­wandung der Abdeckungen 20 beträgt 3 - 5 mm, wobei zur Kokillenwandung ein geringer Spalt vorhanden ist.To protect against the molten steel, U-shaped covers 20 are pushed over the cooling and connecting element 9a, 9b, 9c in the area of the shrink joints. The profile wall of the covers 20 is 3-5 mm, with a small gap being present to the mold wall.

Claims (5)

1. Anfahrkopf für eine Stahlbandgießanlage zur Einführung in die Kokille, an dem ein oberes Abkühl- und Verbindungs­element angeordnet ist, das mit im Abstand zueinander angeordneten Vorsprüngen versehen ist, die mit der er­starrenden Stahlschmelze eine formschlüssige Verbindung bilden,
dadurch gekennzeichnet,
daß das Abkühl- und Verbindungselement (9a, 9b, 9c) zwischen mindestens zwei Vorsprüngen (13) durch Schrumpf­fugen (18) unterteilt ist, die gegen die Schmelze abge­dichtet sind.1. Start-up head for a steel strip caster for introduction into the mold, on which an upper cooling and connecting element is arranged, which is provided with spaced-apart projections which form a positive connection with the solidifying steel melt,
characterized,
that the cooling and connecting element (9a, 9b, 9c) is divided between at least two projections (13) by shrinking joints (18) which are sealed against the melt. 2. Anfahrkopf nach Anspruch 1,
dadurch gekennzeichnet,
daß das Abkühl- und Verbindungselement (9a, 9b, 9c) und ein Unterteil (8) in Längsrichtung ihrer Kontaktflächen im Sinne einer Verkleinerung der Schrumpffugen (18) ver­schiebbar verbunden sind.2. starting head according to claim 1,
characterized,
that the cooling and connecting element (9a, 9b, 9c) and a lower part (8) are slidably connected in the longitudinal direction of their contact surfaces in the sense of reducing the shrinkage joints (18). 3. Abkühl- und Verbindungselement an einem Anfahrkopf nach Anspruch 1,
dadurch gekennzeichnet,
daß die Schrumpffugen (18) durch ein feuerfestes Vliess (19) in ihrer Weite bestimmt und ausgefüllt sind.3. cooling and connecting element on a starting head according to claim 1,
characterized,
that the shrink joints (18) are determined and filled in by a fireproof fleece (19). 4. Abkühl- und Verbindungselement nach Anspruch 3,
dadurch gekennzeichnet,
daß die Weite der Schrumpffugen (18) etwa 20 mm beträgt.4. cooling and connecting element according to claim 3,
characterized,
that the width of the shrink joints (18) is about 20 mm. 5. Abkühl- und Verbindungselement nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß die Schrumpffugen (18) gegen die Stahlschmelze durch ein U-förmiges Abdeckprofil (20) verschlossen sind.5. cooling and connecting element according to one of claims 1 to 3,
characterized,
that the shrink joints (18) against the molten steel are closed by a U-shaped cover profile (20).
EP88119732A 1987-12-12 1988-11-26 Starter bar head for a steel band casting machine Expired - Lifetime EP0320681B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88119732T ATE62617T1 (en) 1987-12-12 1988-11-26 STARTING HEAD FOR A STEEL STRIP CASTING PLANT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3742190 1987-12-12
DE19873742190 DE3742190A1 (en) 1987-12-12 1987-12-12 START-UP HEAD FOR A STEEL TAPE CASTING SYSTEM

Publications (3)

Publication Number Publication Date
EP0320681A2 true EP0320681A2 (en) 1989-06-21
EP0320681A3 EP0320681A3 (en) 1989-08-30
EP0320681B1 EP0320681B1 (en) 1991-04-17

Family

ID=6342472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88119732A Expired - Lifetime EP0320681B1 (en) 1987-12-12 1988-11-26 Starter bar head for a steel band casting machine

Country Status (4)

Country Link
EP (1) EP0320681B1 (en)
AT (1) ATE62617T1 (en)
DE (2) DE3742190A1 (en)
ES (1) ES2021816B3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT399834B (en) * 1993-02-12 1995-07-25 Voest Alpine Ind Anlagen START-UP HEAD FOR A CONTINUOUS CASTING SYSTEM
US8151864B2 (en) * 2008-05-23 2012-04-10 Sms Concast Ag System for sealing a dummy bar head in a mould of a continuous casting plant for casting large-format preliminary sections

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE704512C (en) * 1938-09-20 1941-04-01 Siegfried Junghans Closing and pull-out device when pouring roads, in particular made of metal
BE649902A (en) * 1963-06-27
DE1458078A1 (en) * 1963-09-02 1970-01-08 Kocks Dr Ing Friedrich Device for producing long blocks, in particular steel blocks
US3653427A (en) * 1969-08-12 1972-04-04 Mitsubishi Heavy Ind Ltd Dummy bar mechanism
DE3603190A1 (en) * 1986-02-03 1987-08-06 Schloemann Siemag Ag START-UP HEAD FOR A STEEL TAPE CASTING SYSTEM

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT399834B (en) * 1993-02-12 1995-07-25 Voest Alpine Ind Anlagen START-UP HEAD FOR A CONTINUOUS CASTING SYSTEM
US5456307A (en) * 1993-02-12 1995-10-10 Voest-Alpine Industrieanlagenbau Gmbh Starter bar head for a continuous caster
US8151864B2 (en) * 2008-05-23 2012-04-10 Sms Concast Ag System for sealing a dummy bar head in a mould of a continuous casting plant for casting large-format preliminary sections
CN101585076B (en) * 2008-05-23 2014-04-23 康卡斯特股份公司 Dummy bar head seal system in a mould of a bar casting assembly for casting large-scale preliminary forms

Also Published As

Publication number Publication date
DE3862461D1 (en) 1991-05-23
ATE62617T1 (en) 1991-05-15
EP0320681A3 (en) 1989-08-30
EP0320681B1 (en) 1991-04-17
ES2021816B3 (en) 1991-11-16
DE3742190A1 (en) 1989-06-22

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