EP0852166B1 - Tauchgiessrohr für Giessformen in Stranggiessanlagen - Google Patents

Tauchgiessrohr für Giessformen in Stranggiessanlagen Download PDF

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Publication number
EP0852166B1
EP0852166B1 EP97830676A EP97830676A EP0852166B1 EP 0852166 B1 EP0852166 B1 EP 0852166B1 EP 97830676 A EP97830676 A EP 97830676A EP 97830676 A EP97830676 A EP 97830676A EP 0852166 B1 EP0852166 B1 EP 0852166B1
Authority
EP
European Patent Office
Prior art keywords
discharge nozzle
outlets
main body
outflow duct
moulds
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
EP97830676A
Other languages
English (en)
French (fr)
Other versions
EP0852166A2 (de
EP0852166A3 (de
Inventor
Michele De Santis
Alessandro Ferretti
Leonardo Liberati
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.)
Rina Consulting Centro Sviluppo Materiali SpA
Original Assignee
Centro Sviluppo Materiali 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 Centro Sviluppo Materiali SpA filed Critical Centro Sviluppo Materiali SpA
Publication of EP0852166A2 publication Critical patent/EP0852166A2/de
Publication of EP0852166A3 publication Critical patent/EP0852166A3/de
Application granted granted Critical
Publication of EP0852166B1 publication Critical patent/EP0852166B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Definitions

  • the present invention relates to a discharge nozzle for moulds in continuous casting machines and, more specifically, to a discharge nozzle of molten metal having directed outlets for moulds in continuous casting machines.
  • One known method is that of using a device external to the mould , known as an electromagnetic brake which, by means of an electromagnetic field induced in the bath, influences the movement of the metal, thus reducing stirring in the bath.
  • the disadvantage of a device of this kind is that it involves extremely high costs and, like all external devices in a system, the additional need for maintenance and control.
  • a discharge nozzle with four outlets arranged in the same plane and wherein the upper outlets have a smaller size and are downwards oriented, and the lower outlets have a bigger size and are upwards oriented, in order to reduce turbulence to the bath of molten metal while decreasing the energy of the jet.
  • the object of the present invention is to solve the above mentioned problems by providing a discharge nozzle having its outlets arranged in such a way as to induce a damping effect on the energy of the jet of metal passing through said outlets, and such that said damping effect increases proportionally to the increase of flow rate, thus decreasing stirring in the bath of the mould.
  • a further object of the present invention is to provide a discharge nozzle for moulds that is of simple construction, provides a high level of reliability and in which only normal maintenance operations are required.
  • a discharge nozzle for moulds in continuous casting machines comprises:
  • the discharge nozzle has a body 1 with a substantially cylindrical shape, within which an outflow duct 2 for the molten metal is formed.
  • said duct 2 has a steady cross-section until a predetermined length, at which point two outlets 3 are formed (only one of them is shown in the figure). From that length onwards, the section of the duct 2 decreases and extends for a further determined distance, at which point, in a similar manner to that above, two outlets 4 are formed (only one of them is shown in the figure), which are larger than the two openings 3.
  • the openings 3 and 4 are arranged in an horizontal direction, that is to say at right angles to the longitudinal direction of the discharge nozzle.
  • the discharge nozzle has a body 5 with a substantially cylindrical section, inside which an outflow duct 6 is formed.
  • the duct 6 has a thread 7 for the engaging with the feeder duct of the discharge nozzle (not shown in the figure) in a known manner.
  • the duct 6 is frustoconical along its length, that is to say it has a cross-section that decreases as said duct advances.
  • outlets 8 are formed, both of same size and arranged in a diametrically opposite position. Said outlets 8 are directed upwards so that their longitudinal axis X forms an angle ⁇ with the longitudinal axis Y of the discharge nozzle.
  • outlets 8 are formed, both of same size but larger than the openings 8 and arranged in a diametrically opposite position. Said outlets 9 are directed downwards and in such a way that their longitudinal axis W forms an angle ⁇ with the longitudinal axis Y of the discharge nozzle.
  • both upper outlets 9 and bottom openings 8 is such to give to both the flows of metal passing through them a direction that tends to gather the two flows, i.e. in such a way that the upper flow meets the bottom flow, providing a damping effect on the kinetic energy of both flows, said damping effect increasing as the flow rate increases, and therefore during high production function.
  • Table 1 illustrates the parameters for optimum sizing of the discharge nozzle, in a non-dimensional form and with reference to figure 2, according to the present invention.
  • Table 2 illustrates performance parameters, expressed as normalised values, resulting from comparison of the discharge nozzle according to the present invention and a standard two-outlets discharge nozzle.
  • DISCHARGE NOZZLE DIMENSIONS NON-DIMENSIONAL PARAMETERS Top diameter of duct D Bottom diameter of duct (D') 0.7 ⁇ 0.8 D Top external diameter of discharge nozzle 1.71 D Bottom external diameter of discharge nozzle 1.57 D Position of bottom outlets starting from lower end of discharge nozzle 1.03 D Position of upper outlets starting from lower end of discharge nozzle 2.32 D Angle ⁇ between X axis of bottom outlets and longitudinal axis Y of discharge nozzle 60° ⁇ ⁇ ⁇ 90° Angle ⁇ between W axis of upper outlets and longitudinal axis Y of discharge nozzle 60° ⁇ ⁇ ⁇ 90° Diameter of upper outlets 0.92 D Diameter of bottom outlets 0.85 D PARAMETERS Standard discharge nozzle Discharge nozzle according to the invention Impact speed (m/s) 0.22 0.13 Impact point (mm) 320 250 Wave index
  • the impact speed on the side walls of the mould decreased by approximately 40%, the wave level by 10% and the formation of vortexes by 50%. Only the index of lack of thermal uniformity is slightly worse, but on the basis of the experience of any technician skilled in the art the overall values give a strong indication of improvement.
  • the present invention is not limited to the embodiment described above, but comprises any alternative version thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Ship Loading And Unloading (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Fertilizing (AREA)
  • Nozzles (AREA)

Claims (6)

  1. Strahldüse für Formen in Stranggussmaschinen, die umfasst:
    einen Hauptkörper (5) mit zylindrischer Form;
    eine Austrittsleitung (6), die im Inneren des Hauptkörpers (5) ausgebildet ist und einen vorgegebenen Durchmesser (D) hat;
    wenigstens zwei erste Auslasse (8), die symmetrisch zueinander am Außenumfang des Hauptkörpers (5) und am unteren Ende des Hauptkörpers (5) angeordnet sind, um Verbindung der Austrittsleitung (6) nach außen herzustellen;
    wenigstens zwei zweite Auslasse (9), die symmetrisch zueinander am Außenumfang des Hauptkörpers (5) und über den wenigstens zwei ersten Öffnungen (8) angeordnet sind, um Verbindung der Austrittsleitung (6) nach außen herzustellen;
    dadurch gekennzeichnet, dass jeder Auslass der wenigstens zwei ersten Auslasse (8) eine Aufwärtsrichtung und ein Durchmesserverhältnis von 0,85 D hat, und dass jeder Auslass der wenigstens zwei zweiten Auslasse (9) eine Abwärtsrichtung und ein Durchmesserverhältnis von 0,92 D hat.
  2. Strahldüse für Formen in Stranggussmaschinen nach Anspruch 1, wobei die Austrittsleitung (6) nach unten kegelstumpfförmig ist.
  3. Strahldüse nach Anspruch 1 oder 2, wobei die geometrische Achse (X) jedes Auslasses der wenigstens zwei ersten Auslasse (8) nach oben gerichtet ist und einen Winkel (α), der zwischen 60° und weniger als 90° liegt, zur Längsachse (Y) der Austrittsleitung (6) bildet.
  4. Austrittsdüse nach Anspruch 1 oder 2 oder 3, wobei die geometrische Achse (W) jedes Auslasses der wenigstens zwei zweiten Auslasse (9) nach unten gerichtet ist und einen Winkel (β), der zwischen 60° und weniger als 90° liegt, zur Längsachse (Y) der Austrittsleitung (6) bildet.
  5. Strahldüse nach Anspruch 3, wobei der Winkel (α) 75° beträgt.
  6. Strahldüse nach Anspruch 4, wobei der Winkel (β) 75° beträgt.
EP97830676A 1996-12-16 1997-12-16 Tauchgiessrohr für Giessformen in Stranggiessanlagen Expired - Lifetime EP0852166B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM960869 1996-12-16
IT96RM000869A IT1289251B1 (it) 1996-12-16 1996-12-16 Scaricatore per lingotteria in macchine di colata continua

Publications (3)

Publication Number Publication Date
EP0852166A2 EP0852166A2 (de) 1998-07-08
EP0852166A3 EP0852166A3 (de) 1998-07-22
EP0852166B1 true EP0852166B1 (de) 2002-07-24

Family

ID=11404595

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97830676A Expired - Lifetime EP0852166B1 (de) 1996-12-16 1997-12-16 Tauchgiessrohr für Giessformen in Stranggiessanlagen

Country Status (5)

Country Link
EP (1) EP0852166B1 (de)
AT (1) ATE220963T1 (de)
DE (1) DE69714203T2 (de)
ES (1) ES2183119T3 (de)
IT (1) IT1289251B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2004291536B2 (en) * 2003-11-17 2009-05-07 Vesuvius Crucible Company Multi-outlet casting nozzle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10113026C2 (de) * 2001-03-17 2003-03-27 Thyssenkrupp Stahl Ag Tauchrohr für das Vergießen von Metallschmelze, insbesondere von Stahlschmelze

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1287752B (de) * 1966-08-03 1969-01-23 Mannesmann Ag Verteilerausguss in Stranggiessanlagen
US3371704A (en) * 1967-02-20 1968-03-05 Astrov Evgeny Ivanovitch Device for supplying molten metal into a mould of a continuous casting machine
JPS61180656A (ja) * 1985-02-07 1986-08-13 Nippon Kokan Kk <Nkk> 連続鋳造用浸漬ノズル
JPS61226149A (ja) * 1985-04-01 1986-10-08 Nippon Kokan Kk <Nkk> 連続鋳造用浸漬ノズル
GB8814331D0 (en) * 1988-06-16 1988-07-20 Davy Distington Ltd Continuous casting of steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2004291536B2 (en) * 2003-11-17 2009-05-07 Vesuvius Crucible Company Multi-outlet casting nozzle

Also Published As

Publication number Publication date
EP0852166A2 (de) 1998-07-08
DE69714203D1 (de) 2002-08-29
ATE220963T1 (de) 2002-08-15
EP0852166A3 (de) 1998-07-22
ITRM960869A1 (it) 1998-06-16
DE69714203T2 (de) 2003-03-27
IT1289251B1 (it) 1998-09-29
ITRM960869A0 (it) 1996-12-16
ES2183119T3 (es) 2003-03-16

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