EP0407323B1 - Verfahren und Vorrichtung zum Stranggiessen mit Doppelrollen von dünnen metallischen Produkten, geeignet zum Kaltwalzen - Google Patents

Verfahren und Vorrichtung zum Stranggiessen mit Doppelrollen von dünnen metallischen Produkten, geeignet zum Kaltwalzen Download PDF

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Publication number
EP0407323B1
EP0407323B1 EP90470042A EP90470042A EP0407323B1 EP 0407323 B1 EP0407323 B1 EP 0407323B1 EP 90470042 A EP90470042 A EP 90470042A EP 90470042 A EP90470042 A EP 90470042A EP 0407323 B1 EP0407323 B1 EP 0407323B1
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EP
European Patent Office
Prior art keywords
towards
contact
rolls
wall
roll
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
EP90470042A
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English (en)
French (fr)
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EP0407323A1 (de
Inventor
Paul Victor Riboud
Jean-Luc Jacquot
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.)
USINOR SA
Original Assignee
USINOR Sacilor SA
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Publication date
Application filed by USINOR Sacilor SA filed Critical USINOR Sacilor SA
Priority to AT90470042T priority Critical patent/ATE98144T1/de
Publication of EP0407323A1 publication Critical patent/EP0407323A1/de
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Publication of EP0407323B1 publication Critical patent/EP0407323B1/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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars

Definitions

  • the present invention relates to the casting between cylinders of thin metallic products, such as in particular strips or sheets of steel, according to the preambles of claims 1 and 2.
  • This type of casting is intended for obtaining by casting thin products which can then be directly cold rolled.
  • the molten metal is poured into a casting space defined by the portions of the cylindrical walls of the cylinders situated above the plane passing through the parallel axes of said cylinders, and by end walls also called small faces or side walls, generally fixed, substantially perpendicular to the axes of the cylinders.
  • the liquid metal gradually solidifies on contact with cooled cylindrical walls of the cylinders, forming solidified skins which are driven by the rotating cylinders and meet at the neck, that is to say at the said level. plane passing through the axes of the cylinders, to form the finished product which is continuously extracted downwards.
  • these installations also comprise a sort of fixed extension consisting of two longitudinal walls in sealed contact with the cylinders and two front walls extending upwards said small faces or forming an integral part thereof.
  • This enhancement will hereinafter be designated by the term “feeder” by analogy with the part surmounting the ingot mold or the mold and intended to contain the retaining feeder in the casting installations in fixed ingot mold or molding.
  • This "flyweight” has the particular function, in the case of casting between cylinders, of delimiting the cylinder surface on which the solidification of the cast metal takes place, and thus ensuring the regularity of this solidification, whatever the level of metal in the counterweight.
  • the meniscus of the liquid metal is not in contact with the walls of the cylinders and the risk of entrainment of impurities floating on the meniscus is thus considerably reduced.
  • Document JP-A-60 54 249 on which the preambles of claims 1 and 2 are based, discloses a casting installation between cylinders having concave curvilinear generators, the concavity of which corresponds to the variation in thickness that the strip would have pouring under the effect of the thermal bulge of the cylinders.
  • the main problem which the present invention proposes to solve therefore comes down to obtaining a product resulting from casting which has this convex shape and which is solidified throughout its section at the level of the neck between the cylinders.
  • the invention relates to a continuous casting process between cylinders according to which liquid metal is poured between two cylinders of parallel axes driven in rotation in opposite directions and whose walls are cooled, and minus a cylinder whose generatrix is curvilinear and whose diameter is slightly smaller in its axially middle part than towards its ends.
  • this method is characterized in that said generator is hot curvilinear and the metal is kept in contact with the wall of said cylinder on a longer arc in said middle part than towards said ends.
  • the method consists in increasing the contact time of the metal with the cooled wall of the cylinder in the axially median zone of the latter relative to the contact time in the end zones, so as to form a thicker solidified skin towards the middle than on its edges and therefore to obtain, at the level of the neck between the cylinders, a product solidified in its entire cross section and having the desired desired bulging, this bulging corresponding moreover to the "hollow" of the cylinder surface.
  • the inventors have indeed found experimentally that the contact time, and therefore the length of the contact arc, of the metal on the cylinder has a considerable influence on the thickness of the solidified skin.
  • a variation of 50 mm in this arc length can induce a variation in thickness of the solidified skin of approximately 50 ⁇ m.
  • the inventors have therefore imagined using this property to obtain the desired bulge by adapting the length of the contact arc between cylinder and metal at a certain distance from the vertical median plane perpendicular to the axes of the cylinders, as a function of the thickness. of the product sought at this distance measured from the longitudinal axis of the product, or in other words, as a function of the "hollow" of the surface of the cylinders.
  • the invention also relates to a device for casting between rolls comprising two rolls having cooled walls, at least one of the rolls having a curvilinear generator and a slightly smaller diameter in its axially median part than towards its ends, characterized in that said generator is hot curvilinear and in that it comprises means for holding the metal in contact with the wall of at least one of the cylinders on a longer arc in said middle part than towards said ends.
  • these means consist of a longitudinal wall of a counterweight, the lower edge of which is substantially in contact with the wall of a cylinder above the neck between said cylinders, and the line of contact of said lower edge with the cylinder is curved.
  • the length of the arc of the surface of this cylinder between said line and said neck is greater towards the middle of said longitudinal wall than on its edges.
  • said longitudinal wall of the counterweight is generally planar and has at its lower edge a chamfer more accentuated towards the middle of said wall than towards its edges.
  • said longitudinal wall of the counterweight has a concavity directed towards the inside of the counterweight.
  • FIG. 1 is shown a continuous casting installation between cylinders comprising two cylinders 1 and 2 surmounted by a counterweight 3.
  • the cylinders 1, 2 are slightly “hollow”, that is to say that their generators 11, 12 are not absolutely straight but slightly curved, with an arrow corresponding substantially to the value of the desired convex for the cast product. They are rotated in opposite directions, according to arrows 13, and their walls are cooled. It is specified that the hollow of the cold cylinders can be slightly different, in general higher, from said desired convex of the product, this in order to compensate for hot their possible variations in diameter due to expansion, during the thermal regime at the start casting, expansion whose effects are generally not perfectly identical over the entire length of the cylinders.
  • the counterweight made of refractory material comprises two longitudinal walls 31 parallel to the axes of the cylinders and the lower edge 33 of which is kept in contact with the cylinders with as little functional clearance as possible, and two front walls 32 which also constitute in the example shown the end walls closing off the casting space 4 delimited furthermore by the portion of the surfaces of the cylinders above the neck 5 situated at the horizontal plane P passing through the axes of said cylinders.
  • the lower edge of said longitudinal walls 31 comprises a chamfer 34 of increasing importance from the ends towards the middle of said longitudinal walls 31. Therefore the contact line 35 of each longitudinal wall with the corresponding cylinder is curve and the chamfer 34 is therefore concave.
  • This chamfer is clearly visible in the drawings of Figure 2 wherein Figure 2a shows a section of the longitudinal wall 31 at one end thereof and Figure 2b a section of this wall towards the middle. It is clearly seen that the arc 6 on which the cast metal is in contact with the cooled wall of the cylinder towards its middle, is longer than the corresponding arc 7 towards its ends.
  • the liquid metal is poured into the counterweight and fills the casting space 4.
  • the level of liquid metal is regulated to be maintained above the contact line 35 between the counterweight and the cylinder.
  • the time of contact of the metal with the wall of the cylinder is greater towards its middle, which leads to a greater thickness of solidified skin at center of the product only on its edges.
  • the skins meet at the level of the neck 5 and form the final product having the desired bulge, as shown in FIG. 4 a .
  • the product 8 has been shown as consisting of two curved zones 8 ', 8''each from the skins formed respectively on each cylinder. It will of course be understood that there is no real discontinuity between these two zones in the finished product.
  • FIG 4b there is shown similarly a section of the product from an installation according to another embodiment of the invention in which a single cylinder is hollow and only the longitudinal wall of the counterweight adjacent to this cylinder has the chamfer described above, the second cylinder then having rectilinear generators and the corresponding longitudinal wall of the counterweight being plane up to the line of contact with said second cylinder.
  • the skin 9 'formed on this second cylinder is of constant thickness over its entire width, only the skin 9''having an extra thickness towards its middle.
  • the lower edge 33 of the longitudinal wall 31 should also have a curvature corresponding to the "hollow” of the cylinder to maintain a constant functional clearance over its entire length between said wall and the cylinder.
  • this "hollow” being practically very small, even if said lower edge is rectilinear, which facilitates the manufacture of the counterweight, there is little risk of infiltration of the liquid metal by the said clearance.
  • the variation in solidified thickness necessary to ensure the desired convexity of the cast product and the uniform solidification of the product at the level of the neck 5 requires a significant variation in the length of the contact arc on which the solidification of the skins.
  • the invention is not limited to the device described above by way of example.
  • the longitudinal walls 31 ' have a concavity directed towards the regular casting space over the entire height of said walls.
  • the longitudinal walls of the counterweight do not have a chamfer at their lower edges, but it is the general curvature of these walls which determines a curved line 35 'of counterweight-cylinder contact and therefore the variation in length of contact arc sought.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Exhaust Gas After Treatment (AREA)

Claims (5)

  1. Verfahren zum Stranggießen zwischen Walzen, bei dem das flüssige Metall zwischen zwei sich gegenläufig drehenden achsparallelen Walzen (1, 2) gegossen wird, deren Wände gekühlt sind, wobei wenigstens eine Walze verwendet wird, deren Erzeugende gekrümmt ist und deren Durchmesser im, in Axialrichtung gesehen, Mittelabschnitt geringfügig kleiner ist als an ihren Enden, dadurch gekennzeichnet, daß die Erzeugende im heißen Zustand gebogen ist und daß die Berührung des Metalls mit der Wand der Walze entlang eines Bogens erfolgt, der im mittleren Abschnitt länger ist als an den Enden.
  2. Vorrichtung zum Gießen zwischen Walzen, mit zwei Walzen (1, 2) mit gekühlten Wänden, wobei wenigstens eine der Walzen eine gebogene Erzeugende aufweist, wobei ihr Durchmesser im, in Axialrichtung gesehen, Mittelabschnitt geringfügig kleiner ist als an den Enden, dadurch gekennzeichnet, daß die Erzeugende im heißen Zustand gebogen ist und daß die Vorrichtung eine Anordnung aufweist, um die Berührung des Metalls mit der Wand wenigstens einer der Walzen entlang eines Bogens zu gewährleisten, der im mittleren Abschnitt länger ist als an den Enden.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß diese Anordnung aus der Längswand (31) eines Gießaufsatzes (3) besteht, deren unterer Rand (33) im wesentlichen die Wand einer Walze unterhalb der Engstelle (5) zwischen den Walzen berührt und daß die Linie (35, 35') des unteren Randes, welche mit der Walze in Berührung steht, gebogen ist.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Längswand (31) des Gießaufsatzes im wesentlichen eben ist und an ihrem unteren Rand eine Abschrägung (34) aufweist, die in der Mitte der Wand ausgeprägter ist als an ihren Rändern.
  5. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Längswand des Gießaufsatzes eine zum Inneren des Gießaufsatzes hin gerichtete Konkavität aufweist.
EP90470042A 1989-07-04 1990-06-27 Verfahren und Vorrichtung zum Stranggiessen mit Doppelrollen von dünnen metallischen Produkten, geeignet zum Kaltwalzen Expired - Lifetime EP0407323B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90470042T ATE98144T1 (de) 1989-07-04 1990-06-27 Verfahren und vorrichtung zum stranggiessen mit doppelrollen von duennen metallischen produkten, geeignet zum kaltwalzen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8909088 1989-07-04
FR8909088A FR2649340B1 (fr) 1989-07-04 1989-07-04 Procede et dispositif de coulee continue entre cylindres de produits metalliques minces aptes au laminage a froid direct

Publications (2)

Publication Number Publication Date
EP0407323A1 EP0407323A1 (de) 1991-01-09
EP0407323B1 true EP0407323B1 (de) 1993-12-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP90470042A Expired - Lifetime EP0407323B1 (de) 1989-07-04 1990-06-27 Verfahren und Vorrichtung zum Stranggiessen mit Doppelrollen von dünnen metallischen Produkten, geeignet zum Kaltwalzen

Country Status (15)

Country Link
EP (1) EP0407323B1 (de)
JP (1) JPH0342152A (de)
KR (1) KR910002539A (de)
CN (1) CN1050342A (de)
AT (1) ATE98144T1 (de)
AU (1) AU627049B2 (de)
BR (1) BR9003172A (de)
CA (1) CA2019927A1 (de)
DE (1) DE69005049T2 (de)
DK (1) DK0407323T3 (de)
ES (1) ES2047894T3 (de)
FR (1) FR2649340B1 (de)
RU (1) RU2004377C1 (de)
TW (1) TW202402B (de)
ZA (1) ZA905189B (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2684576A1 (fr) * 1991-12-04 1993-06-11 Usinor Sacilor Dispositif de coulee continue d'une bande mince metallique entre cylindres.
US5477911A (en) * 1994-03-24 1995-12-26 Danieli United, Inc. Twin roller caster
KR101119959B1 (ko) * 2004-12-28 2012-03-13 주식회사 포스코 양호한 주편을 생산하기 위한 쌍롤식 박판 주조롤
JP2014018825A (ja) * 2012-07-18 2014-02-03 Ihi Corp 双ロール式鋳造装置の冷却ロール
CN103934267B (zh) * 2014-03-07 2015-08-26 东北大学 一种双冷却区双辊铸轧装置
CN104439132A (zh) * 2014-12-24 2015-03-25 江苏锴博材料科技有限公司 非晶制带生产用冷却辊

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55165260A (en) * 1979-06-08 1980-12-23 Furukawa Electric Co Ltd:The Direct production of sheet from molten metal
JPS6054249A (ja) * 1983-09-06 1985-03-28 Kawasaki Steel Corp 急冷薄帯製造機
CH666842A5 (de) * 1984-03-01 1988-08-31 Concast Service Union Ag Verfahren und vorrichtung zum kontinuierlichen giessen von metallen in form von band zwischen zwei gekuehlten achsparallelen trommeln.
GB2198976B (en) * 1986-12-19 1990-10-17 Davy Mckeen Roll caster
US4749024A (en) * 1987-09-28 1988-06-07 Battelle Development Corporation Direct cast strip thickness control

Also Published As

Publication number Publication date
EP0407323A1 (de) 1991-01-09
DK0407323T3 (da) 1994-04-11
ES2047894T3 (es) 1994-03-01
KR910002539A (ko) 1991-02-25
JPH0342152A (ja) 1991-02-22
ATE98144T1 (de) 1993-12-15
DE69005049T2 (de) 1994-07-07
TW202402B (de) 1993-03-21
RU2004377C1 (ru) 1993-12-15
CN1050342A (zh) 1991-04-03
ZA905189B (en) 1992-02-26
FR2649340A1 (fr) 1991-01-11
FR2649340B1 (fr) 1994-03-11
CA2019927A1 (fr) 1991-01-04
BR9003172A (pt) 1991-08-27
DE69005049D1 (de) 1994-01-20
AU627049B2 (en) 1992-08-13
AU5865590A (en) 1991-01-10

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