EP0709151A1 - Gussformoberfläche für eine Metallstranggiesskokille mit beweglichen Wänden - Google Patents

Gussformoberfläche für eine Metallstranggiesskokille mit beweglichen Wänden Download PDF

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Publication number
EP0709151A1
EP0709151A1 EP95402231A EP95402231A EP0709151A1 EP 0709151 A1 EP0709151 A1 EP 0709151A1 EP 95402231 A EP95402231 A EP 95402231A EP 95402231 A EP95402231 A EP 95402231A EP 0709151 A1 EP0709151 A1 EP 0709151A1
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EP
European Patent Office
Prior art keywords
dimples
casting
dimple
circular
perimeter
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
EP95402231A
Other languages
English (en)
French (fr)
Other versions
EP0709151B1 (de
Inventor
Hugues Legrand
Christian Marchionni
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.)
Thyssen Stahl AG
USINOR SA
Original Assignee
Thyssen Stahl AG
USINOR Sacilor SA
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Publication date
Application filed by Thyssen Stahl AG, USINOR Sacilor SA filed Critical Thyssen Stahl AG
Publication of EP0709151A1 publication Critical patent/EP0709151A1/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
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/0651—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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/05—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds into moulds having adjustable walls

Definitions

  • the invention relates to the continuous casting of metals. More specifically, it relates to installations for the continuous casting of metals such as steel by solidification of the liquid metal on a movable wall or between two movable walls. These movable walls may, in particular, be constituted by the lateral surfaces of one or two cylinders with a horizontal axis energetically cooled internally.
  • the micro-cracks which have just been mentioned originate from the thermal gradients which are established in the skin of the product during its solidification against the cooled wall of the cylinder, and which generate stresses there.
  • a certain roughness is commonly printed on the surface of the cylinders. Air (or an inert gas blown and confined above the casting space) is trapped in the hollow parts of the surface before the latter comes into contact with the liquid metal. It forms a gaseous "mattress" between the metal and the cylinder, and this mattress tends to decrease the rate of cooling of the skin, therefore the thermal gradients.
  • the roughness also makes it possible to distribute the stresses and thermal deformations on a scale such that they do not cause defects.
  • protrusions would solidify while their presence on the strip is undesirable. If the dimples are of adequate size, the metal entering them does not solidify there immediately. The protrusions then constitute material reserves which exhibit a more plastic behavior than the neighboring portions of the skin solidified on the smooth parts of the cylinder. When the skin cools, which is accompanied by a contraction of the metal, these protrusions behave like expansion joints: They contract faster than their surroundings while absorbing the internal tensions in the skin resulting from its contraction, and which, otherwise, could lead to cracking of the surface of the strip. This accentuated contraction also means that on the solidified and cooled strip, no more or almost no protuberances are observed. So that these dimples can fully play their role, the distances which separate them must also be maintained between the lower and upper limits specified in this document, which depend on the diameter of the dimples.
  • Document EP409645 proposes to use as inerting gas for the casting space of the installation a gas partially soluble in steel, to avoid the appearance of serrations on the surface of the strip, which would be due to a exaggerated expansion of the gas during the initiation of solidification, if it was completely insoluble. Conversely, a fully soluble gas may no longer play its role of mattress between the cylinder and the strip. It is proposed to use for this purpose, as soluble gas, nitrogen, hydrogen, carbon dioxide or ammonia, this soluble gas being mixed with argon or helium. The soluble gas content recommended in this mixture is 30 to 90%.
  • the object of the invention is to provide the dimples with a configuration which allows them to play their role in preventing micro-cracks with an even greater efficiency compared to the practice of the prior art.
  • the subject of the invention is a casting surface of a mold for continuously casting metals with a movable wall, of the type comprising dimples of generally circular or elliptical shape, characterized in that said dimples have lobes on their around.
  • Said casting surface may, in particular, be constituted by the lateral surface of a cylinder or of two cylinders cooled in rotation.
  • the invention consists in giving the dimples no longer circular or oval, but a lobed shape.
  • lobed form is meant that, at starting from a general shape at least approximately circular or elliptical, the periphery of the dimples comprises portions where its radius of curvature is significantly smaller, in absolute value, than the mean radius of curvature of the dimple.
  • This periphery can thus be constituted by an alternation of portions with a small radius of curvature, the concavity of which is successively turned towards the inside then towards the outside of the dimple.
  • lobed dimples according to the invention provide an increase in the length of the edges, therefore of this cooling effect, for a surface of the dimples which remains identical to the prior art. Under these conditions, the overall speed of cooling of the strip is not modified, since the latter depends, all other things being equal, on the percentage of the surface of the cylinders which is occupied by the openings in the dimples.
  • the circular dimple 1 according to the prior art shown in top view in FIG. 1 (the deformations due to the curvature of the surface of the cylinder, whose radius, which is of the order of 250 to 750 mm, have been neglected, is very large compared to the dimensions of the dimples, which are of the order of mm or less) has a radius R, an area S (equal to ⁇ R) and a perimeter P (equal to 2 ⁇ R).
  • R radius
  • S equal to ⁇ R
  • P equal to 2 ⁇ R
  • This lobed dimple 2 is inscribed in a circle of radius R ', this radius R' being calculated so that the lobed dimple 2 has a surface S 'equal to the surface S of the preceding circular dimple 1.
  • the periphery of this lobed dimple 2 is in the form of an alternation of semicircles 3, 4, 5, 6, the concavities of which are turned towards the inside of the dimple, and of quadrants of circle 7, 8, 9, 10 whose concavities are turned towards the outside of the dimple.
  • the radius of curvature "a" of semicircles 3-6 and the radius of curvature "a"'of the quadrants 7-10 are both equal to R' / 3.
  • the ratio P '/ S' is equal to 2.95 / R ', that is, expressed as a function of the radius R of the circular dimple of equivalent surface, at 2.43 / R , while P / S for this circular dimple would only be 2 / R.
  • These dimples can be formed on the copper ferrule, which usually constitutes the external surface of the cylinders, for example by rolling a knurled wheel bearing an engraving in relief reproducing their shape.
  • This engraving repels the material of the shell to the desired depth (which is of the order of 5 to 100 ⁇ m as usual), and therefore causes the appearance of reliefs on the edges of the dimples. It is then necessary to rectify the surface of the shell in order to eliminate these reliefs.
  • the example of dimples that has been described and shown is not limiting, and other types of lobed dimples, having different lobes in shape and / or in number are conceivable. Instead of being inscribed exactly in a circle, the dimples can be inscribed only approximately, or also be inscribed in an ellipse. Optimally, it is recommended that the lobed dimples have a perimeter P 'of between 1.1 and 1.5 times the perimeter P of circular dimples which would have an identical unit surface. If P 'is less than 1.1 times P, the gain obtained is too low and not detectable.
  • the invention is not only applicable to cylinders intended to equip a steel casting machine between two cylinders, but also to any casting surface of an ingot mold with movable wall (s), such as the surface of a cylinder of a machine for casting very thin strips on a rotating cylinder, or that of a strip of a metal casting machine between two running strips

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Coating With Molten Metal (AREA)
EP95402231A 1994-10-31 1995-10-06 Gussformoberfläche für eine Metallstranggiesskokille mit beweglichen Wänden Expired - Lifetime EP0709151B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9413028A FR2726209B1 (fr) 1994-10-31 1994-10-31 Surface de coulee d'une lingotiere de coulee continue des metaux a paroi mobile
FR9413028 1994-10-31

Publications (2)

Publication Number Publication Date
EP0709151A1 true EP0709151A1 (de) 1996-05-01
EP0709151B1 EP0709151B1 (de) 1999-09-08

Family

ID=9468385

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402231A Expired - Lifetime EP0709151B1 (de) 1994-10-31 1995-10-06 Gussformoberfläche für eine Metallstranggiesskokille mit beweglichen Wänden

Country Status (10)

Country Link
EP (1) EP0709151B1 (de)
JP (1) JPH08206791A (de)
KR (1) KR960013520A (de)
AT (1) ATE184226T1 (de)
AU (1) AU689632B2 (de)
DE (1) DE69511984T2 (de)
DK (1) DK0709151T3 (de)
ES (1) ES2137467T3 (de)
FR (1) FR2726209B1 (de)
GR (1) GR3032048T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8122937B2 (en) 2007-10-12 2012-02-28 Nucor Corporation Method of forming textured casting rolls with diamond engraving

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1295859B1 (it) * 1997-11-12 1999-05-28 Acciai Speciali Terni Spa Rullo di raffreddamento per macchine di colata continua
KR100668126B1 (ko) 2000-05-12 2007-01-16 신닛뽄세이테쯔 카부시키카이샤 박육 주편 연속 주조용 냉각 드럼의 가공 장치

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0309247A2 (de) 1987-09-24 1989-03-29 Nippon Steel Corporation Kühltrommel für Stranggussmaschinen zur Herstellung dünner metallischer Bänder
EP0409645A1 (de) 1989-07-20 1991-01-23 Nippon Steel Corporation Verfahren und Vorrichtung zum Stranggiessen von Stahlblech
EP0463177A1 (de) * 1990-01-12 1992-01-02 Nippon Steel Corporation Im strang gegossener dünner gegenstand und verfahren zum giessen
EP0481481A1 (de) * 1990-10-19 1992-04-22 Nippon Steel Corporation Verfahren zur Herstellung dünner gegossener rostfreier austenitischer Stahlbänder und derart hergestellte Bänder
EP0577833A1 (de) * 1991-01-11 1994-01-12 Nippon Steel Corporation Kühlwalze zum giessen dünner teile, vorrichtung und verfahren zur formung von grübchen in die oberfläche besagter walze

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0309247A2 (de) 1987-09-24 1989-03-29 Nippon Steel Corporation Kühltrommel für Stranggussmaschinen zur Herstellung dünner metallischer Bänder
EP0409645A1 (de) 1989-07-20 1991-01-23 Nippon Steel Corporation Verfahren und Vorrichtung zum Stranggiessen von Stahlblech
EP0463177A1 (de) * 1990-01-12 1992-01-02 Nippon Steel Corporation Im strang gegossener dünner gegenstand und verfahren zum giessen
EP0481481A1 (de) * 1990-10-19 1992-04-22 Nippon Steel Corporation Verfahren zur Herstellung dünner gegossener rostfreier austenitischer Stahlbänder und derart hergestellte Bänder
EP0577833A1 (de) * 1991-01-11 1994-01-12 Nippon Steel Corporation Kühlwalze zum giessen dünner teile, vorrichtung und verfahren zur formung von grübchen in die oberfläche besagter walze

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8122937B2 (en) 2007-10-12 2012-02-28 Nucor Corporation Method of forming textured casting rolls with diamond engraving

Also Published As

Publication number Publication date
DE69511984T2 (de) 2000-05-18
FR2726209B1 (fr) 1996-11-29
EP0709151B1 (de) 1999-09-08
ES2137467T3 (es) 1999-12-16
FR2726209A1 (fr) 1996-05-03
DK0709151T3 (da) 2000-04-03
AU3316495A (en) 1996-05-09
KR960013520A (ko) 1996-05-22
AU689632B2 (en) 1998-04-02
ATE184226T1 (de) 1999-09-15
GR3032048T3 (en) 2000-03-31
DE69511984D1 (de) 1999-10-14
JPH08206791A (ja) 1996-08-13

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