EP0852166A2 - Discharge nozzle for moulds of continuous casting machines - Google Patents
Discharge nozzle for moulds of continuous casting machines Download PDFInfo
- Publication number
- EP0852166A2 EP0852166A2 EP97830676A EP97830676A EP0852166A2 EP 0852166 A2 EP0852166 A2 EP 0852166A2 EP 97830676 A EP97830676 A EP 97830676A EP 97830676 A EP97830676 A EP 97830676A EP 0852166 A2 EP0852166 A2 EP 0852166A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- discharge nozzle
- outlets
- main body
- outflow duct
- nozzle according
- 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
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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 old, 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.
- 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 old.
- 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 75° ⁇ 15° Angle ⁇ between W axis of upper outlets and longitudinal axis Y of discharge nozzle 75° ⁇ 15° 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 100 90 Vortex index 100 50 Lack
- the present invention is not limited to the embodiment described above, but comprises any alternative version thereof.
Abstract
characterised in that each outlet of said at least two first outlets (8) has a prevalently upward direction, and in that each outlet of said at least two second outlets (9) has a prevalently downward direction, and in that said outflow duct (6) is optionally downwardly frustoconical.
Description
characterised in that each outlet of said at least two first outlets has a prevalently upward direction, and in that each outlet of said at least two second outlets has a prevalently downward direction, and in that said outflow duct is optionally downwardly frustoconical.
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 α between X axis of bottom outlets and longitudinal axis Y of discharge nozzle | 75° ± 15° |
Angle β between W axis of upper outlets and longitudinal axis Y of discharge nozzle | 75° ± 15° |
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 | 100 | 90 |
Vortex index | 100 | 50 |
Lack of | 2% | 3% |
Claims (9)
- A discharge nozzle for moulds in continuous casting machines, comprising:a main body (5) of substantially cylindrical shape;an outflow duct (6) formed inside said main body (5);at least two first outlets (8) arranged in a substantially symmetrical manner along the external perimeter of said main body (5) one respect to the other, and at the lower end of said main body (5) in order to communicate said outflow duct (6) towards the outside;at least two second outlets (9) arranged in a substantially symmetrical manner along the external perimeter of said main body (5) one respect to the other, and above said at least two first openings (8), in order to communicate said outflow duct (6) towards the outside;
characterised in that each outlet of said at least two first outlets (8) has a prevalently upward direction, and in that each outlet of said at least two second outlets (9) has a prevalently downward direction, and in that said outflow duct (6) is optionally downwardly frustoconical. - A discharge nozzle according to claim 1, wherein said at least two second outlets (9) are greater than said at least two first outlets (8).
- A discharge nozzle according to claim 1 or 2, wherein each outlet of said at least two first outlets (8) has its geometrical axis (X) directed upwards and forming an angle (α) less than 90° with the longitudinal axis (Y) of said outflow duct (6).
- A discharge nozzle according to any of the preceding claims, wherein each outlet of said at least two second outlets (9) has its geometrical axis (W) directed downwards and forming an angle (β) less than 90° with the longitudinal axis (Y) of said outflow duct (6).
- A discharge nozzle according to claim 3, wherein said angle (α) is comprised between 60° and 90°.
- A discharge nozzle according to claim 5, wherein said angle (α) is 75°.
- A discharge nozzle according to claim 4, wherein said angle (β) is comprised between 60° and 90°.
- A discharge nozzle according to claim 7, wherein said angle (β) is 75°.
- A discharge nozzle substantially as described above with reference to the enclosed drawings.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITRM960869 | 1996-12-16 | ||
IT96RM000869A IT1289251B1 (en) | 1996-12-16 | 1996-12-16 | UNLOADER FOR LINGOTTERY IN CONTINUOUS CASTING MACHINES |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0852166A2 true EP0852166A2 (en) | 1998-07-08 |
EP0852166A3 EP0852166A3 (en) | 1998-07-22 |
EP0852166B1 EP0852166B1 (en) | 2002-07-24 |
Family
ID=11404595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97830676A Expired - Lifetime EP0852166B1 (en) | 1996-12-16 | 1997-12-16 | Discharge nozzle for moulds of continuous casting machines |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0852166B1 (en) |
AT (1) | ATE220963T1 (en) |
DE (1) | DE69714203T2 (en) |
ES (1) | ES2183119T3 (en) |
IT (1) | IT1289251B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10113026C2 (en) * | 2001-03-17 | 2003-03-27 | Thyssenkrupp Stahl Ag | Immersion tube for pouring molten metal, especially molten steel |
WO2005049249A2 (en) * | 2003-11-17 | 2005-06-02 | Vesuvius Crucible Company | Multi-outlet casting nozzle |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3371704A (en) * | 1967-02-20 | 1968-03-05 | Astrov Evgeny Ivanovitch | Device for supplying molten metal into a mould of a continuous casting machine |
DE1287752B (en) * | 1966-08-03 | 1969-01-23 | Mannesmann Ag | Distribution nozzle in continuous casting plants |
JPS61180656A (en) * | 1985-02-07 | 1986-08-13 | Nippon Kokan Kk <Nkk> | Immersion nozzle for continuous casting |
JPS61226149A (en) * | 1985-04-01 | 1986-10-08 | Nippon Kokan Kk <Nkk> | Immersion nozzle for continuous casting |
WO1989012519A1 (en) * | 1988-06-16 | 1989-12-28 | Davy (Distington) Limited | Refractory feed tube |
-
1996
- 1996-12-16 IT IT96RM000869A patent/IT1289251B1/en active IP Right Grant
-
1997
- 1997-12-16 AT AT97830676T patent/ATE220963T1/en not_active IP Right Cessation
- 1997-12-16 ES ES97830676T patent/ES2183119T3/en not_active Expired - Lifetime
- 1997-12-16 EP EP97830676A patent/EP0852166B1/en not_active Expired - Lifetime
- 1997-12-16 DE DE69714203T patent/DE69714203T2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1287752B (en) * | 1966-08-03 | 1969-01-23 | Mannesmann Ag | Distribution nozzle in continuous casting plants |
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 (en) * | 1985-02-07 | 1986-08-13 | Nippon Kokan Kk <Nkk> | Immersion nozzle for continuous casting |
JPS61226149A (en) * | 1985-04-01 | 1986-10-08 | Nippon Kokan Kk <Nkk> | Immersion nozzle for continuous casting |
WO1989012519A1 (en) * | 1988-06-16 | 1989-12-28 | Davy (Distington) Limited | Refractory feed tube |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 011, no. 001 (M-550), 6 January 1987 & JP 61 180656 A (NIPPON KOKAN KK), 13 August 1986, * |
PATENT ABSTRACTS OF JAPAN vol. 011, no. 067 (M-566), 28 February 1987 & JP 61 226149 A (NIPPON KOKAN KK), 8 October 1986, * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10113026C2 (en) * | 2001-03-17 | 2003-03-27 | Thyssenkrupp Stahl Ag | Immersion tube for pouring molten metal, especially molten steel |
WO2005049249A2 (en) * | 2003-11-17 | 2005-06-02 | Vesuvius Crucible Company | Multi-outlet casting nozzle |
WO2005049249A3 (en) * | 2003-11-17 | 2005-12-29 | Vesuvius Crucible Co | Multi-outlet casting nozzle |
CN100415411C (en) * | 2003-11-17 | 2008-09-03 | 维苏维尤斯·克鲁斯布公司 | Multi-outlet casting nozzle |
US7581664B2 (en) | 2003-11-17 | 2009-09-01 | Vesuvius Crucible Company | Multi-outlet casting nozzle |
Also Published As
Publication number | Publication date |
---|---|
ITRM960869A1 (en) | 1998-06-16 |
IT1289251B1 (en) | 1998-09-29 |
EP0852166A3 (en) | 1998-07-22 |
DE69714203D1 (en) | 2002-08-29 |
ITRM960869A0 (en) | 1996-12-16 |
DE69714203T2 (en) | 2003-03-27 |
EP0852166B1 (en) | 2002-07-24 |
ATE220963T1 (en) | 2002-08-15 |
ES2183119T3 (en) | 2003-03-16 |
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