EP0933152B1 - Eine variable, unterteilte, bewegliche Blockkokille für eine Stranggiessanlage - Google Patents

Eine variable, unterteilte, bewegliche Blockkokille für eine Stranggiessanlage Download PDF

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Publication number
EP0933152B1
EP0933152B1 EP98204472A EP98204472A EP0933152B1 EP 0933152 B1 EP0933152 B1 EP 0933152B1 EP 98204472 A EP98204472 A EP 98204472A EP 98204472 A EP98204472 A EP 98204472A EP 0933152 B1 EP0933152 B1 EP 0933152B1
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EP
European Patent Office
Prior art keywords
elements
ingot mold
die
fork
die elements
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
EP98204472A
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English (en)
French (fr)
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EP0933152A1 (de
Inventor
Alberto Augusti
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.)
Pomini Long Rolling Mills SRL
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VAI Pomini SRL
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Publication date
Application filed by VAI Pomini SRL filed Critical VAI Pomini SRL
Publication of EP0933152A1 publication Critical patent/EP0933152A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
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    • 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
    • B22D11/0608—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by caterpillars

Definitions

  • the present invention is relevant to a variable section mobile ingot mold for a continuous casting plant.
  • continuous casting process for the production of billets and ingots it is known that stationary die elements or chill elements, with correct geometric shapes, have been used, steel from the ladle and the tundish is poured into said dies.
  • Slight oscillations are present in the direction of the material flow in order to avoid the steel to stick to the walls of the ingot mold.
  • the die elements or chill elements slide together at the same speed of the cast material which is in the solidification phase. In such a way any movement between the ingot mold and the material surface is eliminated.
  • the material As it cools, solidifies and shrinks.
  • a solidification with shrinkages is deleterious when it determines a gap between the metal and the ingot mold that notably decreases the thermal exchange.
  • the thermal exchange must always be maximised since, in a minimum amount of time and for a limited section, the solid outer layer of the metal containment has to be formed wherein the core of the section is still at the liquid state.
  • a continuous casting plant that has walls which travel in the vertical direction is known from DE 3911283.
  • Another purpose is to reduce to a minimum the problems related to the thermal exchange between the concerned
  • variable section mobile ingot mold for a continuous casting plant has been realised, with its detailed characteristics shown hereinafter in the attached claims.
  • Figure 1 shows a variable section mobile ingot mold, in accordance with the invention, which is set in vertical type continuous casting plant.
  • the molten metal outlet pipe 10 is shown in the figure, for example from a tundish, not shown, wherein said pipe feeds a variable section mobile ingot mold, indicated hereinafter by 11, wherein die elements are provided which can engage with each other at least along a rectilinear portion.
  • the ingot mold 11 comprises four pulling elements, properly driven, assembled in a swirl or closed ring shape, each of these pulling elements has, in the example, the chain couples 12, 12', 13, 13', 14, 14' and 15, 15', as shown in figures 3-5.
  • each chain couples 12, 12', 13, 13', 14, 14' and 15, 15' carries a plurality of wall elements or copper sectors 16, 17, 18 and 19 that make up a die or a chill, since they are opposite, adjacent and in contact along the sides to form, for instance, a quadrilateral.
  • the wall elements or sectors 16-19 made of copper, or of an equivalent material with a high heat transmission factor, positioned as previously described, i.e. opposite to each other and in contact along the sides, in order to prevent the leakage of the material while still in a liquid state, form a quadrilateral continuous cavity that realises a continuous die which moves forward with the molten metal and the casting liquid poured therein.
  • chains 12, 12', 13, 13', 14, 14' and 15, 15' wind on the geared wheels 20 and 21 are positioned at the ends of an elongated ring configuration.
  • the chain couples carrying the copper sectors 16-19, set to wind on the respective geared wheels 20 and 21, besides determining the forward movement of the chains and of the copper sectors, locate a rectilinear portion of the ingot mold. In this rectilinear portion the four adjacent and opposite sectors 16-19 are engaged to form a continuous quadrilateral cavity.
  • support plates 22 are provided, said plates are positioned behind the chain couples and serve as a containment frame. These support plates 22 are correctly inclined and are kept in position by elastic elements 23 so as to fit perfectly to the chains that slide while supporting the copper sectors 16-19.
  • elements suitable to supply cooling water are provided, said element are indicated by 24, the water hits the inclined support plate 22 and the pulling chains 12, 12', 13, 13', 14, 14' and 15, 15' and the copper sectors 16-19. Cooling by water sprayed on a surface of the copper sectors 16-19 is carried out both in the casting phase and along the return section of the chains with the disengaged copper sectors.
  • shafts 25 and 26 of the geared wheels 20 and 21 are provided, said shafts are pivoted, free to rotate, on a couple of elongated plates 27 and positioned on opposite sides of the geared wheels 20 and 21, said shafts connect said geared wheels and keep them at a fixed predetermined distance.
  • the upper support shaft 25 of the upper geared wheel 20 extends towards the outside in such a way as to insert itself in the holes 28 of a fork element 29 that encloses the plates 27 and the upper geared wheel 20.
  • This fork element 29 is provided in its central upper portion with an appendix 30 with an attachment hole 31, obtained in a perpendicular direction to that of the previously mentioned upper shaft 25.
  • the ingot mold in accordance to the invention, provides a head frame element 32, with quadrilateral shape and support, to which four similar fork elements are attached and each element supports one of the couples of chains 12, 12', 13, 13', 14, 14' and 15, 15' with their corresponding copper sectors 16-19.
  • the drilled appendix 30 of each fork 29 can be inserted in a 'U-shaped' support 33, directed downward, and provided with holes 34 on the walls of the U-shaped support.
  • a pivot (not shown) is inserted into these holes 31 and 34 of both the appendix 30 and the U-shaped support 33, said pivot allows the oscillation of the single fork elements 29 with respect to the head frame element 32.
  • Figure 2 shows this head element 32 exploded and without connecting pivots to the appendixes of the four underlying fork elements 29 that carry the chains and the copper sectors.
  • This upper structure of the ingot mold allows the four chain couples and the corresponding copper sectors to realise a movement towards each other according to a first axis X, as well as a linear misalignment along a second axis Y, perpendicular to the first axis X, that allows such a movement.
  • Figure 3 shows the cross section of the configuration of a variable section ingot mold for a continuous casting plant wherein the copper sectors 16-19 are shown, and said sectors are engaged, by using pivots 40, to the intermediate supports 41 that are engaged, by using pivots 42, to chains 12, 12', 13, 13', 14, 14' and 15, 15'.
  • the rollers 43 being part of the chain, slide and rotate directly on the corresponding support plate 22, which is placed behind the chain couple, when given the function of containment frame.
  • the elastic elements 23, placed behind the inclined support plates 22, are also shown, said elements allow an adjustment of the chains 12, 12', 13, 13', 14, 14' and 15, 15', maintaining them in a correct working position to exert pressure.
  • Figures 4 and 5 show a different embodiment of the copper sectors and their actions in two different sections of the ingot mold.
  • the copper sectors 16-19 present, at one of their ends, a wedge-shaped protrusion 44 that, engaging with equivalent shaped sectors, determines a blunt edge section configuration, of the pseudo octagonal type or an octagon with unequal sides.
  • Figure 4 is obtained at the upper portion of the ingot mold, where the metal is still in a liquid state and has still a significant overall dimension in the casting cavity.
  • Figure 5 is obtained at the lower portion of the ingot mold, in accordance with the invention, wherein the metal has at last a good solidified skin.
  • the constant reduction of the cross-section of the metal that moves forward between the copper sectors during the solidification phase determines some sort of rolling of the skin with the core still being in a liquid state.
  • the skin is subjected to the action of the copper sectors that move closer to each other to decrease the quadrilateral section, by moving in relation to the skin with a limited mutual sliding between the contact surfaces. Therefore, the section of the metal coming out from the ingot mold has smaller dimensions than the dimensions of the entrance section.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Body Structure For Vehicles (AREA)
  • Handcart (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Glanulating (AREA)
  • Medicinal Preparation (AREA)

Claims (9)

  1. Bewegliche Blockkokille für eine vertikale Stranggussanlage, wobei die Blockkokille vier Zugelemente (12, 12', 13, 13', 14, 14', 15, 15') umfasst, die jeweils um an den Enden einer länglichen Ringanordnung angeordnete Zahnräder (20, 21) gewunden sind und eine Vielzahl von Wandungsformelementen (16-19) tragen, die miteinander entlang zumindest eines geradlinigen Abschnittes in Eingriff stehen können, wobei die Wandungsformelemente (16-19) in der Form eines geschlossenen Kreises zusammengebaut und derart angeordnet sind, dass sie einander zugewandt sind und nebeneinander in Kontakt stehen, um einen vierseitigen kontinuierlichen Hohlraum zu bilden, der eine kontinuierliche Form bildet, die sich mit dem erschmolzenen Gussteil und dem flüssigen Metall vorwärts bewegt, wobei die vier Zugelemente (12, 12', 13, 13', 14, 14', 15, 15') und die relevanten Formelemente (16-19) durch Aufbauten getragen sind, die es zulassen, dass sich jedes der vier Zugelemente um eine erste Achse (X) sowie um eine zweite Achse (Y), die senkrecht zu der ersten Achse (X) steht, drehen kann, um den Querschnitt vom oberen Ende bis zum unteren Ende der Kokille zu verringern, wobei die Aufbauten, die die Bewegung von jedem der vier Zugelemente aufeinander zu zulassen, umfassen
    zur Bewegung um die erste Achse (X):
    Wellen (25) und (26) der Zahnräder (20) und (21), die zur freien Drehung an einem Paar länglichen Platten (27), die auf entgegengesetzten Seiten der Zahnräder (20) und (21) angeordnet sind, drehbar vorgesehen sind, wobei die Platten (27) die Zahnräder verbinden und in einem festen vorbestimmten Abstand halten;
    für jedes der vier Zugelemente ein Gabelelement (29), das die Platten (27) und das obere Zahnrad (20) umschließt, wobei das Gabelelement (29) mit Löchern (28) versehen ist, in denen die obere Lagerwelle (25) des oberen Zahnrades (20) eingesetzt ist, damit die vier Zugelemente (12, 12', 13, 13', 14, 14', 15, 15') und die entsprechenden Formelemente (16-19) sich um die obere Welle (25) in Bezug auf die Gabel (29) drehen können; und
    für die Bewegung um die zweite Achse (Y):
    jedes Gabelelement (29) in seinem zentralen oberen Abschnitt mit einem Fortsatz (30) mit einem Befestigungsloch (31) in einer rechtwinkligen Richtung zu jener der oberen Welle (25) versehen ist, so dass der Fortsatz (30) jeder Gabel (29) mit einem Kopfrahmenelement (32) der Blockkokille drehbar verbunden sein kann, damit sich jedes der einzelnen Gabelelemente (29) in Bezug auf das Kopfrahmenelement (32) drehen kann.
  2. Bewegliche Blockkokille nach Anspruch 1,
    dadurch gekennzeichnet, dass U-förmige Träger (33) an dem Kopfrahmenelement (32) nach unten gerichtet vorgesehen sind, wobei die Wände des U-förmigen Trägers (33) mit Löchern (34) versehen sind, um mit dem gebohrten Fortsatz (30) jeder Gabel (29) eine Drehverbindung herzustellen.
  3. Bewegliche Blockkokille nach Anspruch 1,
    dadurch gekennzeichnet, dass jedes der vier Zugelemente ein Paar Ketten (12, 12', 13, 13', 14, 14', 15, 15') umfasst, wobei entgegengesetzte Ketten in entgegengesetzte Richtungen rotieren, wobei jedes Paar Ketten die Vielzahl von Formelementen (16-19), die einen kontinuierlichen vierseitigen Hohlraum bilden, trägt, und die beiden Kettenpaare (12, 12', 13, 13', 14, 14', 15, 15') derart eingerichtet sind, dass sie auf den Zahnräder (20, 21), zwischen denen der geradlinige Abschnitt gebildet ist, gewickelt werden können.
  4. Bewegliche Blockkokille nach Anspruch 3,
    dadurch gekennzeichnet, dass die Formelemente (16-19), die von den Kettenpaaren getragen sind, um den kontinuierlichen vierseitigen Hohlraum in dem geradlinigen Abschnitt zu bilden, mit hinteren Tragplatten (22) und Elementen versehen sind, die dafür geeignet sind, Kühlwasser (24) zuzuführen, wobei elastische Druckelemente (23) mit den Tragplatten (22) zur Verringerung des Querschnittes in Eingriff stehen.
  5. Bewegliche Blockkokille nach Anspruch 4,
    dadurch gekennzeichnet, dass die Tragplatten (22) zusammen mit dem Kopfrahmenelement (32) der Blockkokille geneigt sein können.
  6. Bewegliche Blockkokille nach Anspruch 1,
    dadurch gekennzeichnet, dass die Formelemente durch Kupfersektoren (16-19) gebildet sind.
  7. Bewegliche Blockkokille nach Anspruch 1,
    dadurch gekennzeichnet, dass die Formelemente aus einem Material mit einer hohen Wärmeübergangszahl (16-19) hergestellt sind.
  8. Bewegliche Blockkokille nach Anspruch 1,
       dadurch gekennzeichnet, dass die Formelemente (16-19) flach sind.
  9. Bewegliche Blockkokille nach Anspruch 1,
    dadurch gekennzeichnet, dass die Formelemente (16-19) flach sind und an einem ihrer Enden mit einem keilförmigen Vorsprung (44) versehen sind, auf eine solche Weise, dass durch Eingriff mit äquivalenten Formelementen die Vorsprünge ein Teilstück mit stumpfen Kanten und einer achteckigen Form bilden.
EP98204472A 1998-01-15 1998-12-29 Eine variable, unterteilte, bewegliche Blockkokille für eine Stranggiessanlage Expired - Lifetime EP0933152B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT98MI000056A IT1298127B1 (it) 1998-01-15 1998-01-15 Lingottiera mobile a sezione variabile per un impianto di colata continua
ITMI980056 1998-01-15

Publications (2)

Publication Number Publication Date
EP0933152A1 EP0933152A1 (de) 1999-08-04
EP0933152B1 true EP0933152B1 (de) 2004-05-26

Family

ID=11378578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98204472A Expired - Lifetime EP0933152B1 (de) 1998-01-15 1998-12-29 Eine variable, unterteilte, bewegliche Blockkokille für eine Stranggiessanlage

Country Status (5)

Country Link
EP (1) EP0933152B1 (de)
AT (1) ATE267652T1 (de)
DE (1) DE69824136T2 (de)
ES (1) ES2219843T3 (de)
IT (1) IT1298127B1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0651218B2 (ja) * 1987-10-02 1994-07-06 新日本製鐵株式会社 ベルト式連続鋳造機
JPH01130855A (ja) * 1987-11-17 1989-05-23 Ishikawajima Harima Heavy Ind Co Ltd 無限軌道式連続鋳造機
DE3911283A1 (de) * 1989-04-07 1990-10-11 Georg Dr Bollig Stranggussanlage mit mitlaufender kokille

Also Published As

Publication number Publication date
EP0933152A1 (de) 1999-08-04
ES2219843T3 (es) 2004-12-01
ITMI980056A1 (it) 1999-07-15
ATE267652T1 (de) 2004-06-15
DE69824136D1 (de) 2004-07-01
DE69824136T2 (de) 2005-06-02
IT1298127B1 (it) 1999-12-20

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