EP1506825B1 - Vorrichtung sowie Verfahren zur Erzeugung von dünnem Bimetallband mit einer 2-Rollen-Giessvorrichtung - Google Patents

Vorrichtung sowie Verfahren zur Erzeugung von dünnem Bimetallband mit einer 2-Rollen-Giessvorrichtung Download PDF

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Publication number
EP1506825B1
EP1506825B1 EP03017502A EP03017502A EP1506825B1 EP 1506825 B1 EP1506825 B1 EP 1506825B1 EP 03017502 A EP03017502 A EP 03017502A EP 03017502 A EP03017502 A EP 03017502A EP 1506825 B1 EP1506825 B1 EP 1506825B1
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EP
European Patent Office
Prior art keywords
wall
meniscus
chamber
lateral
molten metal
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
EP03017502A
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English (en)
French (fr)
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EP1506825A1 (de
Inventor
Alfredo Poloni
Nuredin Kapaj
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.)
Danieli and C Officine Meccaniche SpA
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Danieli and C Officine Meccaniche SpA
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Application filed by Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Priority to DE60303630T priority Critical patent/DE60303630T2/de
Priority to AT03017502T priority patent/ATE318192T1/de
Priority to EP03017502A priority patent/EP1506825B1/de
Publication of EP1506825A1 publication Critical patent/EP1506825A1/de
Application granted granted Critical
Publication of EP1506825B1 publication Critical patent/EP1506825B1/de
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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
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • B22D11/007—Continuous casting of metals, i.e. casting in indefinite lengths of composite ingots, i.e. two or more molten metals of different compositions being used to integrally cast the ingots

Definitions

  • the invention refers to continuous casting of a bimetallic strip through a twin roll casting machine.
  • the invention deals with a distributor device of the molten metal components on the crystallizing rolls and the corresponding utilization method, in order to prevent the mixing of the above mentioned metals, to keep separated and distinguished their respective meniscuses and thus to ensure a clear separation at the metals interface in the cast product.
  • Patent JP 5277661 is an attempt at solving these inconveniences. It considers a separation wall to keep the two molten metals separated. This solution, however, has big limitations as well: as a matter of fact, there is nothing to prevent the liquid under the wall from flowing through the gaps between the same wall and the rolls into the bath above and vice versa. There are therefore the same inconveniences as with JP '659.
  • Patent JP 4009251 on the contrary, describes a device to plate the strip on one side only and considers two nozzles of the same length which discharge their respective molten metals at a higher level than the roll's profile. Moreover, a vertical separation wall, placed on the centre line of the two rolls, should ensure the separation between the two liquid baths. Not even this patent, however, can give any guarantee to prevent the liquids from getting mixed. It furthermore does not allow to plate both sides of the strip. To avoid these inconveniences, the Applicant has studied, designed and constructed the device as described hereinafter.
  • the main object is to construct a distributor device for the molten metals in association with a method of utilization which can guarantee a clear separation interface between the inner and the outer layers, as well as the absence of any defects in the cast strip.
  • Another object of the present invention is to cast a strip plated on one side only or on both sides.
  • a device for continuous casting a metallic strip through a twin roll casting machine said metallic strip having a metallic coating on at least one side thereof, according to the characterising features of claim 1. Further advantageous embodiments are subject matter of dependent claims. Further, the invention provides a method of continuous casting a metal strip through a twin roll casting machine, said metallic strip having a metallic coating on at least one side thereof by using a distributor device, according to claim 9.
  • the production of a strip having a low carbon core coated on both sides with stainless steel has remarkable advantages mainly for the automotive and the electrical appliances industry.
  • the galvanizing process of the steel sheet is indeed no longer necessary, and this facilitates above all the pressing of the steel sheet itself.
  • a thinner layer of protective paint is required with a resulting reduction in costs and in terms of environmental impact of the galvanizing and painting process.
  • the device and method according to the present invention allows to cast a bi-metallic strip with a total thickness in the of 1-5 mm range through a twin roll continuous casting machine, whose width can range from 500 - 1500 mm starting from the molten component metals as e.g. carbon steel and stainless steel.
  • the stainless steel coating in the cast strip can vary from 5 % to 25 % of the total strip thickness.
  • Fig. 1 shows partly and schematically crystallizing rolls 1 a and 1 b of a twin roll casting machine for continuous casting a metallic strip. Arrows D and E indicate their turning directions, respectively.
  • a distributor means 5 which distributes molten metals A through a nozzle or pipe 6 from a central under-tundish 3 and molten metals B and C through a nozzle or pipe 4a, 4b from under-tundishes 2a or 2b, respectively, on the crystallizing rolls 1 a, 1 b to provide a metallic strip 18 made of three metals A, B and C.
  • the crystallizing rolls 1 a, 1 b are arranged parallel to each other at a given distance d which substantially defines the starting thickness of the cast product or strip.
  • the rolls 1a and 1b define a substantially V-shaped top space, and the distributor device 5 is placed in this substantially V-shaped top space and mounted between a non-shown front wall and the rear wall 40 perpendicular to the axis of the crystallizing rolls 1a, 1b.
  • the strip 18 is coated on both sides.
  • the strip core contains metal A, e.g. low carbon steel, while the two lateral sides contain metals B and C which may be e.g. stainless steel to form the strip coatings on both sides.
  • the distributor device 5 is made up of two spaced vertical walls 7a, 7b, which define a centre chamber 30 for the molten metal A, intermediate walls 8a, 8b, which define with the two spaced vertical walls 7a, 7b, two lateral chambers 31 for the molten metal B and C, respectively, and side walls 9a, 9b, which define with said intermediate walls 8a, 8b, two small spaces 33, respectively, which communicate with said lateral chambers 31 through openings 10a, 10b, respectively, provided close to a bottom portion 35.
  • the side walls 9a, 9b are shorter than the intermediate walls 8a, 8b and define a passage for liquid metal B or C, discharged into the lateral chambers 31.
  • the liquid metal B and C forms a meniscus 21a, 21b, respectively, in the substantially V-shaped top space.
  • the intermediate walls 8a, 8b with bottom openings 10a, 10b and the side walls 9a, 9b are suitable to reduce the kinetic energy of the molten metal B, C coming from the under-tundishes 2a, 2b, respectively, thus ensuring a substantially flat and turbulence-free "lateral" meniscus 21a, 21b.
  • a meniscus 20 is formed in the centre chamber 30, containing the molten metal A.
  • the level of the meniscus 20 of the centre chamber 30 is monitored by a sensor means 38. Further, there are sensor means 38a for the meniscus 21a and 38b for the meniscus 21b.
  • the sensor means 38, 38a and 38b are connected to a control unit 39 for individually feeding molten metals A, B and C to the centre chamber 30 and the lateral chambers 31 in response to signals of said sensor means 38, 38a, 38b to maintain the meniscus 30 and 21a, 21b on a predetermined level.
  • ⁇ h there is a level difference ⁇ h between the said meniscus 20 of the centre chamber 30 and the meniscus 21a of the lateral chamber 31, which is kept constant through the sensor means 38 and the control unit 39 as described above.
  • the difference ⁇ h depends on casting parameters, e.
  • the levels of the three meniscus 20, 21a, 21b are individually controllable through the above mentioned sensor means 38, 38a, 38b and the control unit.
  • FIG 2 shows only half of the device 5 and casting machine of figure 1, i. e. the right portion.
  • molten metal B which is confined between the vertical wall 7a and its respective crystallizing roll 1a, comes into contact with a cool surface of the roll 1a itself and starts to solidify forming a semi-skin S 1a .
  • the semi-skin S 1a formation takes place in the circumference arc, which extends from a contact point P 1 of the lateral meniscus 21a with said roll 1a up to the point P 2 which corresponds to the vertical downward extension of the vertical wall 7a.
  • the point P 2 is called “double point", and above the double point P 2 only the formation of the semi-skin S 1a takes place until reaching its maximum thickness at P 2 .
  • the solidification of molten metal A, contained in the centre chamber 30 starts, and semi-skin S 2a begins to form over the semi-skin S 1a .
  • a point of minimum distance between the rolls 1a, 1b is called the "kissing point”.
  • the semi-skins S 2a , S 2b which have been previously formed on the two rotating crystallizing rolls 1a, 1b, combine to form the desired plated strip 18, which is made of the metal A in its core or centre part and, in figure 2, of metal B on its right surface.
  • the width of the centre chamber 30 determines the position of the double point P 2 , and the position of the double point P 2 defines the final thickness of the semi-skin S 1a and therefore the thickness of the strip coating.
  • a gap 19 is formed between the vertical wall 7a and the casting roll 1a.
  • the rotation of said roll 1a causes the dragging of the molten metal B contained in the side space 37 below the bottom portion 35. This creates a dynamic pressure on said metal B in said passage gap 19. Owing to this additional pressure, a none desired passage of molten metal B from said lateral space 37 into the centre chamber 30 might take place through said gap 19 resulting into a mixing with the molten metal A.
  • the level of the centre meniscus 20 is kept higher than the side meniscus 21a by the amount ⁇ h, as mentioned above.
  • a hat of metal A which determines a ferrostatic pressure on the gap 19, which is sufficient to compensate the total pressure determined by the molten metal B in the same zone. Therefore, the passage of metal B through the gap 19 is prevented, and the semi-skin S 2a , which is formed below the point P 2 , does not contain any unwanted traces of the other metal.
  • Figure 3 corresponds essentially to figure 2.
  • the distributor device 5 is modified to have no side wall 9a.
  • Figure 4 is similar to figure 3, however with a further modified distributor means 5, wherein the side wall 9a and a part of the bottom portion 35 outside the lateral chamber 31 are omitted.
  • the distributor device as shown in figure 2, 3 and 4 can be used only for a half for strip coating on one side only.
  • the upstream feeding system includes only two under-tundishes 2a or 2b, 3 with their respective nozzles 4a or 4b, 6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Claims (10)

  1. Vorrichtung zum kontinuierlichen Gießen eines Metallbandes über eine Doppelwalzen-Gießmaschine, wobei das metallische Band eine metallische Beschichtung an wenigstens seiner einen Seite aufweist, bestehend aus
    einer Verteilungseinrichtung (5) für verschiedene geschmolzene Metalle (A, B, C), wobei die Verteilungseinrichtung (5) zwischen den Kristallisierungswalzen (1a, 1b) oberhalb ihrer Stelle mit minimaler Entfernung vorgesehen ist, wobei die Verteilungseinrichtung (5) eine Vorderwand und eine Rückwand (40), die senkrecht zu der Achse der Kristallisierungswalzen (1a, 1b) angeordnet sind, und
    zwei beabstandete vertikale Wände (7a) aufweist, die zusammen mit der Vorderwand und der Rückwand und den Oberflächen der Kristallisierungswalzen (1a, 1b) eine Mittelkammer (30) zur Aufnahme eines ersten geschmolzenen Metalls (A) bilden,
    gekennzeichnet durch wenigstens eine Zwischenwand (8a), die sich außerhalb einer der vertikalen Wände (7a) von einem Bodenabschnitt (35) zur Bildung einer seitlichen Kammer (31) mit der zugeordneten vertikalen Wand (7a) für ein zweites oder ein zweites und ein drittes geschmolzenes Metall (B, C) jeweils erstreckt, wobei jede Zwischenwand (8a) wenigstens eine Öffnung (10a) aufweist.
  2. Vorrichtung nach Anspruch 1, wobei jede Öffnung (10a) nahe zu dem Bodenabschnitt (35) vorgesehen ist.
  3. Vorrichtung nach Anspruch 1, wobei die Vorderwand (40) und die Rückwand (41) Seitenplatten sind.
  4. Vorrichtung nach einem vorangehenden Anspruch mit wenigstens einer Seitenwand (9a), die sich außerhalb der wenigstens einen Zwischenwand (8a) von dem Bodenabschnitt (35) nahe zu den Kristallisierungswalzen (1a, 1b) zur Bildung einer kleinen Kammer (33) entsprechend erstreckt.
  5. Vorrichtung nach Anspruch 4, wobei jede Seitenwand (9a) kürzer als jede Zwischenwand (8b) ist und einen seitlichen Durchgang für das zweite oder dritte geschmolzene Metall (B, C), das in der seitlichen Kammer (31) enthalten ist, bildet, sobald die Seitenwand (9a) passiert worden ist.
  6. Vorrichtung nach einem vorangehenden Anspruch, bei der ein unteres Ende jeder vertikalen Wand (7a) einen Spalt (19) bezüglich der Kristallisierungswalzen (1a) bildet, wobei der Spalt (19) die Mittelkammer (30) mit einem unterhalb des Bodenabschnitts (35) gebildeten seitlichen Raum (37) verbindet, der geschmolzenes Metall aufnimmt, das die Seitenwände (9a) passiert hat.
  7. Vorrichtung nach einem vorangehenden Anspruch, dadurch gekennzeichnet, dass ein Gießspiegel (21a) vorgesehen ist, der gleichmäßig in dem seitlichen Raum (33) zwischen der Außenseite der Kristallisierungswalze (1a) und der Zwischenwand (8a) durch das zweite oder dritte geschmolzene Metall (B, C) gebildet ist, sobald eine Seitenwand (9a) passiert worden ist.
  8. Vorrichtung nach einem vorangehenden Anspruch, dadurch gekennzeichnet, dass ein Pegel eines Gießspiegels (21a, 21b) vorgesehen ist, der niedriger (Δh) liegt als der Pegel eines Gießspiegels (20) der Mittelkammer (30).
  9. Vorrichtung nach einem vorangehenden Anspruch, gekennzeichnet durch Sensoreinrichtungen (38) für den Pegel des Gießspiegels (20) der Mittelkammer (30) und Sensoreinrichtungen (38a, 38b) für den Pegel eines Gießspiegels (21a) in wenigstens einem seitlichen Raum (33), und durch eine Kontrolleinheit (39) zum individuellen Einspeisen von geschmolzenen Metallen zu der Mittelkammer (30) und wenigstens einer Seitenkammer (31) abhängig von Signalen der Sensoreinrichtungen (38, 38a, 38b).
  10. Verfahren zum kontinuierlichen Gießen eines Metallbandes durch eine Doppelwalzen-Gießmaschine, wobei das Metallband eine metallische Beschichtung an wenigstens einer ihrer Seiten unter Verwendung einer Verteilungseinrichtung gemäß Anspruch 1 aufweist, bestehend aus den folgenden Schritten: Zuführen eines ersten geschmolzenen Metalls zu der Mittelkammer, um einen mittigen Gießspiegel zu erhalten; Zuführen eines zweiten oder jeweils eines zweiten und eines dritten geschmolzenen Metalls jeweils zu einer Seitenkammer, um wenigstens einen seitlichen Gießspiegel zu erhalten; und
    Aufrechterhalten des Pegels des mittigen Gießspiegels im Vergleich zu dem Pegel von wenigstens einem seitlichen Gießspiegel um einen höheren Betrag Δh, welcher durch Gießparameter und Eigenschaften der zu vereinigenden Metalle bestimmt wird.
EP03017502A 2003-08-04 2003-08-04 Vorrichtung sowie Verfahren zur Erzeugung von dünnem Bimetallband mit einer 2-Rollen-Giessvorrichtung Expired - Lifetime EP1506825B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE60303630T DE60303630T2 (de) 2003-08-04 2003-08-04 Vorrichtung sowie Verfahren zur Erzeugung von dünnem Bimetallband mit einer 2-Rollen-Giessvorrichtung
AT03017502T ATE318192T1 (de) 2003-08-04 2003-08-04 Vorrichtung sowie verfahren zur erzeugung von dünnem bimetallband mit einer 2-rollen- giessvorrichtung
EP03017502A EP1506825B1 (de) 2003-08-04 2003-08-04 Vorrichtung sowie Verfahren zur Erzeugung von dünnem Bimetallband mit einer 2-Rollen-Giessvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03017502A EP1506825B1 (de) 2003-08-04 2003-08-04 Vorrichtung sowie Verfahren zur Erzeugung von dünnem Bimetallband mit einer 2-Rollen-Giessvorrichtung

Publications (2)

Publication Number Publication Date
EP1506825A1 EP1506825A1 (de) 2005-02-16
EP1506825B1 true EP1506825B1 (de) 2006-02-22

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EP03017502A Expired - Lifetime EP1506825B1 (de) 2003-08-04 2003-08-04 Vorrichtung sowie Verfahren zur Erzeugung von dünnem Bimetallband mit einer 2-Rollen-Giessvorrichtung

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EP (1) EP1506825B1 (de)
AT (1) ATE318192T1 (de)
DE (1) DE60303630T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102120255A (zh) * 2010-12-30 2011-07-13 中国第一重型机械股份公司 一种层状复合钢板的制造设备及其工作方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0653302B2 (ja) * 1986-05-02 1994-07-20 三菱重工業株式会社 クラツド鋼板製造方法
JPH038538A (ja) * 1989-06-06 1991-01-16 Mitsubishi Electric Corp クラッド材の製造方法
JPH03297542A (ja) * 1990-04-18 1991-12-27 Nisshin Steel Co Ltd 双ロール式連鋳法およびこれに使用する溶湯注入用中間容器
JPH049251A (ja) * 1990-04-26 1992-01-14 Toshiba Corp クラッド板の連続鋳造装置
JPH04138847A (ja) * 1990-09-28 1992-05-13 Nippon Steel Corp 金属と合金よりなる急冷凝固クラッド箔およびその製造方法
JPH0768349A (ja) * 1993-09-01 1995-03-14 Nippon Steel Corp クラッド薄肉鋳片の連続鋳造方法および装置
DE19815010C1 (de) * 1998-01-23 1999-05-06 Schloemann Siemag Ag Gießverfahren für ein Metallband und zugehörige Gießvorrichtung

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Publication number Publication date
EP1506825A1 (de) 2005-02-16
ATE318192T1 (de) 2006-03-15
DE60303630D1 (de) 2006-04-27
DE60303630T2 (de) 2006-09-21

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