EP0227154B1 - Crystallisers employed for almost horizontal continuous casting - Google Patents

Crystallisers employed for almost horizontal continuous casting Download PDF

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Publication number
EP0227154B1
EP0227154B1 EP86202132A EP86202132A EP0227154B1 EP 0227154 B1 EP0227154 B1 EP 0227154B1 EP 86202132 A EP86202132 A EP 86202132A EP 86202132 A EP86202132 A EP 86202132A EP 0227154 B1 EP0227154 B1 EP 0227154B1
Authority
EP
European Patent Office
Prior art keywords
axis
taper
continuous casting
employed
curved side
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
EP86202132A
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German (de)
French (fr)
Other versions
EP0227154A1 (en
Inventor
Leandro Nannini
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
Original Assignee
Danieli and C Officine Meccaniche SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Priority to AT86202132T priority Critical patent/ATE50175T1/en
Publication of EP0227154A1 publication Critical patent/EP0227154A1/en
Application granted granted Critical
Publication of EP0227154B1 publication Critical patent/EP0227154B1/en
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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
    • B22D11/043—Curved moulds

Definitions

  • This invention concerns a crystalliser employed for almost horizontal continuous casting according to the preamble of claim 1.
  • the traditional curved ingot are known from e.g. DE-B-1 025 578, FR-A-1 479 946 and US-A-3 623 533.
  • the ferrostatic pressure in ingot moulds of continuous casting machines and, in particular, in ingot moulds for almost horizontal continuous casting has an increased value on the side having the interior curve of the mould and a reduced value on the side having the exterior curve.
  • such difference in ferrostatic pressure may even reach 30% in ingot moulds for almost horizontal continuous casting.
  • the lengthwise contact surface of the exterior curve is greater than that of the interior curve, and such contact surface varies considerably according to the shapes and dimensions.
  • the cooling conditions therefore, differ as between the interior courve and exterior curve.
  • the crystalliser according to the present invention has a suitable taper as between the frace of the interior curve and the face of the exterior curve of the ingot mould in relation to the axis of the casting line.
  • such taper is dissymmetrical as between the interior curved side and exterior curved side of the ingot mould in relation to the axis of the casting line.
  • the taper is greater in the interior courved side and smaller in the exterior curved side, depending on the degree to which the machine is positioned below the horizontal, such degree being defined by the angle between the horizontal and the raduis of curvature of the casting line running from the centre of curvature to the top of the ingot mould.
  • the lateral faces of the ingot mould retain their normal taper.
  • crys- tallisers possess on their exterior curved side, in relation to the axis of the casting line understood as being the lengthwise axis of the ingot mould with a constant curvature, a taper which is less than or, at the most, the same as those of the exterior curved sides of known embodiments.
  • Such taper is preferably be nil, that is to say, in a preferred embodiment the exterior curved side has the same curvature as the axis of the casting line.
  • the lateral faces of the mould are embodied as at present, whereas the inner curved side is provided with an increased taper, which varies progressively until it reaches a value which may even be twice the normal value.
  • An ingot mould or crystalliser 10 in its traditional form has a conformation according to the lines A and C; the interior curved side is referenced with 11, the exterior curved side with 12 and the lateral faces with 15.
  • the inlet and outlet are referenced with 13 and 14 respectively, while 16 is the level of molten material.
  • the taper of the exterior curved side is substantially reduced progressively (depending on the angle "alpha" of the degree to which the machine is positioned below the horizontal; please see Fig.1)
  • the taper of the interior curved side is substantially increased by an equal value.
  • Such tapers are respectively those of the interior curved side and exterior curved side in relation to the axis 17 of the casting line.
  • the actual line of the interior curved side according to the invention therefore, takes up a development according to the conformation B instead of the conformation A whereas the exterior curved side in turn takes up a development according to the conformation D instead of the conformation C.
  • the taper of the exterior curved side 12 is shown as nil in the example of Fig.2, that is to say, the exterior curved side 12 is parallel to the casting line axis 17 and has a constant curvature.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

Improvements to crystallisers employed for continuous casting, of which the taper in relation to the axis of the casting line (17) is differentiated as between its intrados or interior curve (11) and its extrados or exterior curve (12). Crystalliser employed for continuous casting which incorporates the above improvements.

Description

  • This invention concerns a crystalliser employed for almost horizontal continuous casting according to the preamble of claim 1.
  • During continuous reasearch to eliminate the faults in blooms and billets leaving the ingot moulds the present applicant has undertaken a thorough investigation into ingot moulds.
  • The traditional curved ingot are known from e.g. DE-B-1 025 578, FR-A-1 479 946 and US-A-3 623 533.
  • The applicant has led to the conclusion that the ferrostatic pressure in ingot moulds of continuous casting machines and, in particular, in ingot moulds for almost horizontal continuous casting has an increased value on the side having the interior curve of the mould and a reduced value on the side having the exterior curve. In particular, such difference in ferrostatic pressure may even reach 30% in ingot moulds for almost horizontal continuous casting.
  • Moreover, the lengthwise contact surface of the exterior curve is greater than that of the interior curve, and such contact surface varies considerably according to the shapes and dimensions. The cooling conditions, therefore, differ as between the interior courve and exterior curve.
  • It has also been determined that the contact between steel in its solidification phase and the interior curved side of the ingot mould takes place during a rather short time and causes a relatively small growth of skin, such growth being, in any event, less than that which occurs against the lateral faces and the exterior curved side of the ingot mould.
  • It is a purose of the present invention to obviate these drawbacks.
  • This is achieved by a crystalliser of the mentioned type, and having the features disclosed in the claim 1.
  • The crystalliser according to the present invention has a suitable taper as between the frace of the interior curve and the face of the exterior curve of the ingot mould in relation to the axis of the casting line.
  • In particular, according to the invention, such taper is dissymmetrical as between the interior curved side and exterior curved side of the ingot mould in relation to the axis of the casting line.
  • In particular, the taper is greater in the interior courved side and smaller in the exterior curved side, depending on the degree to which the machine is positioned below the horizontal, such degree being defined by the angle between the horizontal and the raduis of curvature of the casting line running from the centre of curvature to the top of the ingot mould. The lateral faces of the ingot mould retain their normal taper.
  • According to the invention, therefore, the crys- tallisers possess on their exterior curved side, in relation to the axis of the casting line understood as being the lengthwise axis of the ingot mould with a constant curvature, a taper which is less than or, at the most, the same as those of the exterior curved sides of known embodiments.
  • Such taper is preferably be nil, that is to say, in a preferred embodiment the exterior curved side has the same curvature as the axis of the casting line.
  • The lateral faces of the mould are embodied as at present, whereas the inner curved side is provided with an increased taper, which varies progressively until it reaches a value which may even be twice the normal value.
  • The attached figures are given a non-restrictive example and illustrate the following:-
    • Fig. 1 shows a diagrammatic casting line that makes plain the lay-out of the invention;
    • Fig. 2 shows a traditional crystalliser for almost horizontal continuous casting and a crystalliser according to the invention for such type of casting.
    • Fig. 1 shows a continuous casting ingot mould 10 for almost horizontal continuous casting. The axis of the casting line 17 possesses a constant curvature; the angle providing the degree to which the continuous casting is performed below the horizontal is indicated with "alpha".
    • Fig.2 shows a comparison between the geometry of a traditional crystalliser and the geometry of the crystalliser of the invention.
  • An ingot mould or crystalliser 10 in its traditional form has a conformation according to the lines A and C; the interior curved side is referenced with 11, the exterior curved side with 12 and the lateral faces with 15.
  • The inlet and outlet are referenced with 13 and 14 respectively, while 16 is the level of molten material.
  • In this embodiment, whereas the taper of the exterior curved side is substantially reduced progressively (depending on the angle "alpha" of the degree to which the machine is positioned below the horizontal; please see Fig.1), the taper of the interior curved side is substantially increased by an equal value.
  • Such tapers are respectively those of the interior curved side and exterior curved side in relation to the axis 17 of the casting line.
  • The actual line of the interior curved side according to the invention, therefore, takes up a development according to the conformation B instead of the conformation A whereas the exterior curved side in turn takes up a development according to the conformation D instead of the conformation C.
  • In this way, if it is desired to convert a traditional ingot mould or crystalliser into an improved crystalliser, the taper which is created progressively between the interior curved side 111 and casting line axis 17 is increased, whereas the taper between the exterior curved side 12 and casting line axis 17 becomes progressively reduced or even becomes nil.
  • The taper of the exterior curved side 12 is shown as nil in the example of Fig.2, that is to say, the exterior curved side 12 is parallel to the casting line axis 17 and has a constant curvature.

Claims (2)

1. Crystallizer (10) employed for almost horizontal continuous casting, the starting zone of which is curved by a predetermined constant curvature defined by an axis (17) of curvature corresponding to an arc of a circle, said crystallizer (10) comprising two lateral walls (15) having flat surfaces and an external wall (12) and internal wall (11) having curved surfaces, said external wall (12) and internal wall (11) of said crystallizer (10) being tapered towards said axis (17) of curvature, characterised in that the taper between said curved internal wall (11) and curved external wall (12) of said crystallizer (10) towards said axis of curvature is dissymetrical.
2. Crystallizer (10) according to claim 1, characterised in that the taper of the internal wall (11) relative to the axis (17) is greater than the taper of the external wall (12) relative to said axis (17).
EP86202132A 1985-12-23 1986-12-01 Crystallisers employed for almost horizontal continuous casting Expired - Lifetime EP0227154B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86202132T ATE50175T1 (en) 1985-12-23 1986-12-01 CASTING MOLDS FOR ALMOST HORIZONTAL CONTINUOUS CASTING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT83452/85A IT1187604B (en) 1985-12-23 1985-12-23 REFINEMENTS FOR CRYSTALLIZERS FOR CONTINUOUS SUB-HORIZONTAL CASTING AND CRYSTALLIZERS SO PERFECTED
IT8345285 1985-12-23

Publications (2)

Publication Number Publication Date
EP0227154A1 EP0227154A1 (en) 1987-07-01
EP0227154B1 true EP0227154B1 (en) 1990-02-07

Family

ID=11322104

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86202132A Expired - Lifetime EP0227154B1 (en) 1985-12-23 1986-12-01 Crystallisers employed for almost horizontal continuous casting

Country Status (4)

Country Link
EP (1) EP0227154B1 (en)
AT (1) ATE50175T1 (en)
DE (1) DE3668808D1 (en)
IT (1) IT1187604B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3724628C1 (en) * 1987-07-22 1988-08-25 Mannesmann Ag Continuous casting mold for producing thin slabs in slab format
DE3850464T2 (en) * 1987-09-07 1995-01-26 Danieli Off Mecc Casting process for a continuous casting device with reduced height and corresponding immersion pouring.
IT1265065B1 (en) * 1993-05-17 1996-10-30 Giovanni Arvedi PERFECTED INGOT MILL FOR CONTINUOUS STEEL CASTING, PARTICULARLY SUITABLE FOR CONTINUOUS CASTING OF THIN Slabs
EP0931608B1 (en) * 1997-12-24 2002-11-13 EUROPA METALLI S.p.A. Continuous casting mold

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1025578B (en) * 1952-09-06 1958-03-06 Ver Leichtmetallwerke Gmbh Continuous casting plant
FR1479946A (en) * 1966-05-16 1967-05-05 Mannesmann Ag Liquid cooled continuous casting shell for the production of rectangular cast iron blocks
US3623533A (en) * 1970-01-08 1971-11-30 Viktor Nikolaevich Khorev Method of molten metal height control in curved mold continuous casting

Also Published As

Publication number Publication date
ATE50175T1 (en) 1990-02-15
IT1187604B (en) 1987-12-23
EP0227154A1 (en) 1987-07-01
IT8583452A0 (en) 1985-12-23
DE3668808D1 (en) 1990-03-15

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