EP0709151B1 - Surface de coulée d'une lingotière de coulée continue des métaux à paroi mobile - Google Patents
Surface de coulée d'une lingotière de coulée continue des métaux à paroi mobile Download PDFInfo
- Publication number
- EP0709151B1 EP0709151B1 EP95402231A EP95402231A EP0709151B1 EP 0709151 B1 EP0709151 B1 EP 0709151B1 EP 95402231 A EP95402231 A EP 95402231A EP 95402231 A EP95402231 A EP 95402231A EP 0709151 B1 EP0709151 B1 EP 0709151B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dimples
- casting
- dimple
- perimeter
- circular
- 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
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Images
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
- B22D11/04—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
-
- 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
Definitions
- the invention relates to the continuous casting of metals. More specifically, it concerns installations for the continuous casting of metals such as steel by solidification 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 horizontal axis energized internally.
- the pouring space containing the liquid steel is defined by the lateral surfaces of the cylinders, on which the solidification of the strip is initiated, and by plates of refractory side closures applied against the ends of the cylinders.
- micro-cracks which have just been mentioned have their origin in the gradients thermal 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. Of air (or inert gas blown and confined above the casting space) is trapped in the recessed parts of the surface before it comes into contact with liquid metal. It forms a gaseous "mattress" between the metal and the cylinder, and this mattress tends to decrease the cooling rate of the skin, so the gradients thermal.
- the roughness also makes it possible to distribute the stresses and the deformations thermal on a scale such that they do not cause faults.
- the protrusions would solidify while their presence on the strip is undesirable. If the dimples have suitable dimensions, the metal which penetrates there does not solidify there at once. The protrusions then constitute reserves of material which have a more plastic behavior than the neighboring portions of the skin solidified on the smooth parts of the cylinder. When cooling the skin 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, without it, could lead to cracking of the surface of the strip. This contraction accentuated also makes that on the solidified and cooled strip, one no longer observes or practically more protuberances. So that these dimples can fully play their role, it is also necessary that the distances which separate them are maintained between lower and upper limits specified in this document, which depend on the diameter dimples.
- Document EP409645 proposes to use as inerting gas space for pouring of the installation a gas partially soluble in the steel, to avoid the appearance of serrations on the surface of the strip, which would be due to an 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 band. 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 even greater efficiency increased compared to the practice of the Prior Art.
- the invention relates to a casting surface of an ingot mold of continuous casting of moving wall metals, of the type having dimples in shape general circular or elliptical, characterized in that said dimples have lobes around their edges.
- Said casting surface may, in particular, be constituted by the lateral surface of a cylinder or two cylinders cooled in rotation.
- the invention consists in giving the dimples a form no longer circular or oval, but a lobed shape.
- lobed form is meant that, at from a general shape at least approximately circular or elliptical, the around the dimples has portions where its radius of curvature is significantly smaller, in absolute value, than the mean radius of curvature of the dimple.
- This perimeter can thus be constituted by an alternation of portions with low radius of curvature whose concavity is successively turned inwards and then towards the outside of the dimple.
- lobed dimples according to the invention provide an increase in the length of the borders, therefore of this effect of cooling, for a surface of the dimples which remains identical to the Prior Art. In these conditions, the overall speed of cooling of the strip is not modified, since this depends, all other things being equal, on the percentage of the surface of the cylinders which is occupied by the dimple openings.
- the circular dimple 1 according to the prior art shown in top view in FIG. 1 (we have neglected the deformations due to the curvature of the surface of the cylinder, whose radius, which is of the order of 250 to 750 mm, 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 2 ) and a perimeter P (equal to 2 ⁇ R).
- R radius
- S equal to ⁇ R 2
- 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 quarter circles 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 quarter circles 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 surface dimple equivalent, at 2.43 / R, while P / S for this circular dimple would only be equal to 2 / R. So we have, with a lobed dimple, a perimeter significantly greater than that a circular dimple of equivalent surface, which increases the anti-micro-cracking effect sought during the solidification of the strip.
- dimples can be formed on the copper ferrule, which constitutes usually the outer surface of the cylinders, for example by rolling a wheel bearing a relief engraving reproducing their shape.
- This engraving repels the shell material on the desired depth (which is of the order of 5 to 100 ⁇ m as usually), 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.
- dimples that has been described and represented is not limiting, and other types of lobed dimples, having different shaped lobes and / or in number are possible. Instead of being written exactly in a circle, dimples may only be approximately, or also be included in a ellipse. Optimally, it is recommended that the lobed dimples have a perimeter P ' between 1.1 and 1.5 times the perimeter P of circular dimples which would have a identical unit area. 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 on any casting surface of a ingot mold with movable wall (s), such as the surface of a cylinder of a casting machine very thin strips on a rotating cylinder, or that of a strip on a pouring of metal between two moving bands
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Coating With Molten Metal (AREA)
Description
- la figure 1 qui montre une fossette selon l'Art Antérieur ;
- la figure 2 qui montre un exemple de fossette selon l'invention destinée à se substituer à la précédente.
Claims (5)
- Surface de coulée d'une lingotière de coulée continue des métaux à paroi mobile, du type comportant des fossettes de forme générale circulaire ou elliptique, caractérisée en ce que le pourtour desdites fossettes comporte des portions où son rayon de courbure est plus faible, en valeur absolue, que le rayon de courbure moyen de la fossette.
- Surface de coulée selon la revendication 1, caractérisée en ce que ledit pourtour est constitué par une alternance de portions à faible rayon de courbure dont la concavité est successivement tournée vers l'intérieur puis vers l'extérieur de la fossette.
- Surface de coulée selon la revendication 1 ou 2, caractérisée en ce que lesdites fossettes ont un périmètre compris entre 1,1 et 1,5 fois le périmètre qu'aurait une fossette circulaire de surface équivalente.
- Surface de coulée selon l'une des revendications 1 à 3, caractérisée en ce qu'elle est constituée par la surface latérale d'un cylindre refroidi en rotation.
- Surface de coulée selon l'une des revendications 1 à 3, caractérisée en ce qu'elle est constituée par la surface latérale de deux cylindres refroidis, en rotation dans des sens opposés, et définissant entre eux un espace de coulée.
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 EP0709151A1 (fr) | 1996-05-01 |
EP0709151B1 true EP0709151B1 (fr) | 1999-09-08 |
Family
ID=9468385
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95402231A Expired - Lifetime EP0709151B1 (fr) | 1994-10-31 | 1995-10-06 | Surface de coulée d'une lingotière de coulée continue des métaux à paroi mobile |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0709151B1 (fr) |
JP (1) | JPH08206791A (fr) |
KR (1) | KR960013520A (fr) |
AT (1) | ATE184226T1 (fr) |
AU (1) | AU689632B2 (fr) |
DE (1) | DE69511984T2 (fr) |
DK (1) | DK0709151T3 (fr) |
ES (1) | ES2137467T3 (fr) |
FR (1) | FR2726209B1 (fr) |
GR (1) | GR3032048T3 (fr) |
Families Citing this family (3)
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 |
DE60128217T2 (de) | 2000-05-12 | 2008-01-03 | Nippon Steel Corp. | Gekühlte giesswalze zum kontinuierlichen stranggiessen von dünnen produkten und kontinuierlichesstranggiessverfahren |
AU2008100847A4 (en) | 2007-10-12 | 2008-10-09 | Bluescope Steel Limited | Method of forming textured casting rolls with diamond engraving |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2037232T3 (es) * | 1987-09-24 | 1993-06-16 | Nippon Steel Corporation | Tambor de refrigeracion para maquinas de colada continua para fabricar fleje metalico delgado. |
US5103895A (en) | 1989-07-20 | 1992-04-14 | Nippon Steel Corporation | Method and apparatus of continuously casting a metal sheet |
KR950014486B1 (ko) * | 1990-01-12 | 1995-12-02 | 신닛뽄 세이데쓰 가부시끼가이샤 | 두께가 얇은 연속 주조 주편 및 그 제조방법 |
JPH082484B2 (ja) * | 1990-10-19 | 1996-01-17 | 新日本製鐵株式会社 | 表面品質の優れたオーステナイト系ステンレス鋼薄帯状鋳片、薄板の製造方法および薄帯状鋳片 |
AU646547B2 (en) * | 1991-01-11 | 1994-02-24 | Nippon Steel Corporation | Cooling drum for casting thin cast piece; device for and method of forming dimples on peripheral surface of said drum |
-
1994
- 1994-10-31 FR FR9413028A patent/FR2726209B1/fr not_active Expired - Fee Related
-
1995
- 1995-10-06 ES ES95402231T patent/ES2137467T3/es not_active Expired - Lifetime
- 1995-10-06 DE DE69511984T patent/DE69511984T2/de not_active Expired - Fee Related
- 1995-10-06 DK DK95402231T patent/DK0709151T3/da active
- 1995-10-06 EP EP95402231A patent/EP0709151B1/fr not_active Expired - Lifetime
- 1995-10-06 AT AT95402231T patent/ATE184226T1/de not_active IP Right Cessation
- 1995-10-10 AU AU33164/95A patent/AU689632B2/en not_active Ceased
- 1995-10-19 KR KR1019950036289A patent/KR960013520A/ko not_active Application Discontinuation
- 1995-10-31 JP JP7306457A patent/JPH08206791A/ja not_active Withdrawn
-
1999
- 1999-12-07 GR GR990403137T patent/GR3032048T3/el unknown
Also Published As
Publication number | Publication date |
---|---|
JPH08206791A (ja) | 1996-08-13 |
AU3316495A (en) | 1996-05-09 |
GR3032048T3 (en) | 2000-03-31 |
EP0709151A1 (fr) | 1996-05-01 |
DE69511984T2 (de) | 2000-05-18 |
FR2726209A1 (fr) | 1996-05-03 |
ES2137467T3 (es) | 1999-12-16 |
DE69511984D1 (de) | 1999-10-14 |
ATE184226T1 (de) | 1999-09-15 |
KR960013520A (ko) | 1996-05-22 |
AU689632B2 (en) | 1998-04-02 |
FR2726209B1 (fr) | 1996-11-29 |
DK0709151T3 (da) | 2000-04-03 |
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