EP0195158A2 - Tundish outlet means - Google Patents
Tundish outlet means Download PDFInfo
- Publication number
- EP0195158A2 EP0195158A2 EP85306696A EP85306696A EP0195158A2 EP 0195158 A2 EP0195158 A2 EP 0195158A2 EP 85306696 A EP85306696 A EP 85306696A EP 85306696 A EP85306696 A EP 85306696A EP 0195158 A2 EP0195158 A2 EP 0195158A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- outlet means
- well block
- passages
- means 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.)
- Withdrawn
Links
Images
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 invention relates to tundish outlet means for use in the continuous casting of metal such as steel.
- a tundish receives liquid steel from a ladle and feeds it through an outlet to a mould in continuous casting apparatus.
- the liquid steel is poured from a ladle into a multi-holed tundish for distributing the liquid metal through outlet nozzles to mould-oscillators which each form a continuous strand of solid metal on cooling.
- the flow rate of the metal from the ladle is controlled to optimize the level of the metal in the tundish.
- the oscillators move the moulds up and down to provide a stripping action between the moulds and the billets of solid metal as they are formed. This is followed by a straightener unit which pulls the strands out of the mould at a given rate.
- the speed of withdrawal from the mould is controlled. As this speed is tied to the level of metal in the mould, the flow of metal into the mould is critical. ' The outlet nozzle diameter size controls the flow rate of the metal into the mould.
- Outlet means comprises a well block and a nozzle receivable therein.
- the nozzle has a number of flowthrough passages, which preferably converge towards the top of a casting mould. Two or more passages may be provided in the nozzle. On the wearing out or plugging of one passage, the use of the nozzle may be continued by plugging that passage and opening another.
- the well block is preferably supported by a ring comprising an outer rim contacting a mounting plate welded in an aperture in the tundish bottom and an inner ledge.
- the well block also preferably comprises an inwardly funneled upper portion, an outwardly flared lower portion for receiving the nozzle, and a straight neck between.
- a tundish 10 is provided with a circumscribing wall 12 and a bottom 14 having openings 15, each with a mounting plate 16 for an outlet nozzle 18 (Figures 2 and 3) of refractory material such as zirconia.
- a well block 20 receives the nozzle 18 and is supported by a ring 22.
- the mounting plate 16 provides a central aperture 26.
- the ring 22 has an outer rim 28, a shoulder 30 and an inner ledge 32, fits into the aperture 26, and supports the well block 20 which has the same external shape.
- the well block 20 is generally cylindrical with an inwardly funneled upper portion 34, a straight central neck 36 and a lower portion 38 which flares outwardly at a small angle.
- the nozzle 18 consists of a body 40 with three flowthrough passages 42 located symmetrically about its central axis 43. Each passage 42 is funnel-shaped with an upper truncated conical portion 44 and a lower cylindrical portion 46. A number of equispaced fins 48 project radially into the upper portion 44 of each passage 42.
- the outside surface of the body 40 is tapered slightly at its upper portion 50 to match the flare in lower portion 38 of the well block 20.
- the passages 42 are slightly convergent to meet at a point below the body 40 where the central axis 43 contacts the top of a casting mould (not shown).
- the passages 42 should be as close to vertical as possible when installed, so the body 40 is of a generally triangular shape with rounded edges.
- the inlet end of the body 40 is sectored so that the inlet end of each passage is pie-shaped and arranged segmentally about the central axis 43.
- the nozzle 18 is mounted in the opening 15 of the tundish 10.
- the mounting plate 16 is welded to the bottom 14 of the tundish 10.
- the support ring 22 rests on the mounting plate.
- the well block 20 rests on a ledge 32 of the ring 22.
- the well block is embedded in a refractory lining 52 of the tundish 10. Then nozzle 18 is wedged upwardly through the opening 15 in the tundish bottom 14 to fit coaxially in the lower portion 38 of the well block 20.
- two passages 42 of nozzle 18 are plugged using steel plugs and sand, and the third passage is used.
- the initially used passage 42 is worn out or blocked, it is plugged, preferably using a copper plug, and one of the other two passages is opened using an oxygen lance to burn off the plug.
- the second used passage 42 is blocked or worn out, it is plugged and the third passage is opened.
Abstract
Description
- The invention relates to tundish outlet means for use in the continuous casting of metal such as steel. A tundish receives liquid steel from a ladle and feeds it through an outlet to a mould in continuous casting apparatus. In multi-stranded operation, the liquid steel is poured from a ladle into a multi-holed tundish for distributing the liquid metal through outlet nozzles to mould-oscillators which each form a continuous strand of solid metal on cooling.
- The flow rate of the metal from the ladle is controlled to optimize the level of the metal in the tundish. The oscillators move the moulds up and down to provide a stripping action between the moulds and the billets of solid metal as they are formed. This is followed by a straightener unit which pulls the strands out of the mould at a given rate. To produce a quality billet, the speed of withdrawal from the mould is controlled. As this speed is tied to the level of metal in the mould, the flow of metal into the mould is critical.' The outlet nozzle diameter size controls the flow rate of the metal into the mould. When a nozzle wears due to abrasion of the hot metal or to plugging, either the flow of metal into the mould becomes too great or the stream is not straight and causes a washout or breakout. When this happens the operator must plug off the particular strand and continue casting on the remaining strands. This causes%a production loss.
- The most relevant prior art known to the Applicants are Patent Specifications US 2,193,365, 2,706,365, 3,451,594, 3,566,954, 3,765,572, 3,838,798, 3,850,351, 4,165,026.
- Outlet means according to the invention comprises a well block and a nozzle receivable therein. The nozzle has a number of flowthrough passages, which preferably converge towards the top of a casting mould. Two or more passages may be provided in the nozzle. On the wearing out or plugging of one passage, the use of the nozzle may be continued by plugging that passage and opening another.
- The well block is preferably supported by a ring comprising an outer rim contacting a mounting plate welded in an aperture in the tundish bottom and an inner ledge. The well block also preferably comprises an inwardly funneled upper portion, an outwardly flared lower portion for receiving the nozzle, and a straight neck between.
-
- Figure 1 is a plan of a tundish showing a number of outlet holes;
- Figure 2 is an exploded perspective view of a tundish outlet means according to the invention;
- Figure 3 is a section along 3-3 of Figure 2; and
- Figure 4 is a section along 4-4 of Figure 2.
- In Figure 1 a tundish 10 is provided with a
circumscribing wall 12 and abottom 14 havingopenings 15, each with amounting plate 16 for an outlet nozzle 18 (Figures 2 and 3) of refractory material such as zirconia. A wellblock 20 receives thenozzle 18 and is supported by aring 22. Themounting plate 16 provides acentral aperture 26. Thering 22 has anouter rim 28, ashoulder 30 and aninner ledge 32, fits into theaperture 26, and supports thewell block 20 which has the same external shape. The wellblock 20 is generally cylindrical with an inwardly funneledupper portion 34, a straightcentral neck 36 and alower portion 38 which flares outwardly at a small angle. - The
nozzle 18 consists of abody 40 with threeflowthrough passages 42 located symmetrically about itscentral axis 43. Eachpassage 42 is funnel-shaped with an upper truncated conical portion 44 and a lowercylindrical portion 46. A number of equispacedfins 48 project radially into the upper portion 44 of eachpassage 42. The outside surface of thebody 40 is tapered slightly at itsupper portion 50 to match the flare inlower portion 38 of thewell block 20. - The
passages 42 are slightly convergent to meet at a point below thebody 40 where thecentral axis 43 contacts the top of a casting mould (not shown). Thepassages 42 should be as close to vertical as possible when installed, so thebody 40 is of a generally triangular shape with rounded edges. The inlet end of thebody 40 is sectored so that the inlet end of each passage is pie-shaped and arranged segmentally about thecentral axis 43. - The
nozzle 18 is mounted in the opening 15 of the tundish 10. Themounting plate 16 is welded to thebottom 14 of the tundish 10. Thesupport ring 22 rests on the mounting plate. The wellblock 20 rests on a ledge 32 of thering 22. The well block is embedded in arefractory lining 52 of the tundish 10. Thennozzle 18 is wedged upwardly through the opening 15 in thetundish bottom 14 to fit coaxially in thelower portion 38 of thewell block 20. - Initially, two
passages 42 ofnozzle 18 are plugged using steel plugs and sand, and the third passage is used. When the initially usedpassage 42 is worn out or blocked, it is plugged, preferably using a copper plug, and one of the other two passages is opened using an oxygen lance to burn off the plug. In the same manner, when the second usedpassage 42 is blocked or worn out, it is plugged and the third passage is opened.
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US71341285A | 1985-03-18 | 1985-03-18 | |
US713412 | 1996-09-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0195158A2 true EP0195158A2 (en) | 1986-09-24 |
EP0195158A3 EP0195158A3 (en) | 1987-06-16 |
Family
ID=24866040
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85306696A Withdrawn EP0195158A3 (en) | 1985-03-18 | 1985-09-20 | Tundish outlet means |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0195158A3 (en) |
JP (1) | JPS61212467A (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2706365A (en) * | 1954-02-18 | 1955-04-19 | Owens Corning Fiberglass Corp | Feeder for molten thermoplastic material |
DE2747746A1 (en) * | 1976-11-01 | 1978-05-03 | Dresser Ind | INTERMEDIATE SPRAY SPRAY |
US4165026A (en) * | 1971-12-07 | 1979-08-21 | Foseco Trading A.G. | Tundish with expendable lining and easily removable nozzle |
CH620383A5 (en) * | 1977-04-28 | 1980-11-28 | Concast Ag | Method and apparatus for continuous casting |
-
1985
- 1985-09-20 EP EP85306696A patent/EP0195158A3/en not_active Withdrawn
- 1985-09-25 JP JP21199585A patent/JPS61212467A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2706365A (en) * | 1954-02-18 | 1955-04-19 | Owens Corning Fiberglass Corp | Feeder for molten thermoplastic material |
US4165026A (en) * | 1971-12-07 | 1979-08-21 | Foseco Trading A.G. | Tundish with expendable lining and easily removable nozzle |
DE2747746A1 (en) * | 1976-11-01 | 1978-05-03 | Dresser Ind | INTERMEDIATE SPRAY SPRAY |
CH620383A5 (en) * | 1977-04-28 | 1980-11-28 | Concast Ag | Method and apparatus for continuous casting |
Also Published As
Publication number | Publication date |
---|---|
JPS61212467A (en) | 1986-09-20 |
EP0195158A3 (en) | 1987-06-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1397221B1 (en) | Impact pad for dividing and distributing liquid metal flow | |
US3253307A (en) | Method and apparatus for regulating molten metal teeming rates | |
KR0170045B1 (en) | Flow control device for the suppression of vortices | |
CA2800388C (en) | Submerged entry nozzle | |
CA2479561A1 (en) | Distributor device for use in aluminium metal casting | |
AU2002310036A1 (en) | Impact pad for dividing and distributing liquid metal flow | |
US5083754A (en) | Apparatus for retaining slag during the discharge of molten metal from a tundish | |
CA2257486A1 (en) | Submerged nozzle for the continuous casting of thin slabs | |
US6533992B1 (en) | Tundish | |
WO1993023188A1 (en) | Refractory article for preventing vortexing in a metallurgical vessel | |
JP4556804B2 (en) | Molten metal injection tube and injection method | |
US6156260A (en) | Chamber for reception, lateral division and redirection of liquid metal flow | |
CA2744605C (en) | Vortex inhibitor | |
US4840356A (en) | Externally replaceable stirring plug for molten metal vessels | |
EP0195158A2 (en) | Tundish outlet means | |
CA2390741C (en) | Impact pad | |
EP0396111A2 (en) | Controlling teeming streams | |
US4552343A (en) | Combination electric furnace and slag retaining pouring spout | |
US4230274A (en) | Lance for removing skulls from steelmaking vessels | |
GB2149699A (en) | Method and apparatus for avoiding vortexing in a bottom pour vessel | |
US5246209A (en) | Tundish with improved flow control | |
US3707439A (en) | Device for charging a mold for continuous casting of a hollow ingot | |
US6951296B2 (en) | Method and device for preventing slag from flowing along when tapping a molten metal | |
JPS62500844A (en) | Improvement of ladle for molten metal | |
US5662862A (en) | Device for guiding molten steel in a tundish |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): DE FR GB IT SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): DE FR GB IT SE |
|
17P | Request for examination filed |
Effective date: 19871207 |
|
17Q | First examination report despatched |
Effective date: 19880301 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19880509 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BEATON, JOHN W. |