EP0137238A1 - Giesssystem - Google Patents

Giesssystem Download PDF

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Publication number
EP0137238A1
EP0137238A1 EP84109842A EP84109842A EP0137238A1 EP 0137238 A1 EP0137238 A1 EP 0137238A1 EP 84109842 A EP84109842 A EP 84109842A EP 84109842 A EP84109842 A EP 84109842A EP 0137238 A1 EP0137238 A1 EP 0137238A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
casting
extruded
holder
nozzle holder
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Withdrawn
Application number
EP84109842A
Other languages
English (en)
French (fr)
Inventor
Trygve Rasmussen
Per Kare Vik
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.)
Norsk Hydro ASA
Original Assignee
Norsk Hydro ASA
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 Norsk Hydro ASA filed Critical Norsk Hydro ASA
Publication of EP0137238A1 publication Critical patent/EP0137238A1/de
Withdrawn legal-status Critical Current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
    • 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
    • B22D11/064—Accessories therefor for supplying molten metal
    • B22D11/0642—Nozzles

Definitions

  • the present invention concerns a casting system for continuous strip casting of metals and more specifically a nozzle package in this system which comprises an extruded nozzle holder and a precast nozzle in refractory material.
  • nozzle materials there are a number of requirements that must be fulfilled. They must be thermostable, homogeneous and free from stress after machining, heat insulating (low thermal conductivity), hard-wearing and at the same time machinable to exact dimensional tolerances, inert to the cast metal, they must not contain any components that are dangerous to health, they must be reasonably priced, they must have low weight and low hygroscopicity, etc.
  • Marinite A well-known and hitherto widely used fireproof, ceramics- like material sold under the name Marinite, in the form of compressed sheets with a hard surface, has now been abandoned for many applications because of its asbestos content and its relatively high hygroscopicity.
  • a material that is gaining more and more popularity within casting technology is based on aluminium-silicates (45-50% A1203) and 45-55% Si 0 2 ) and marketed under various names, e.g. under the name Triton Kaowool from the firm Morganite Ceramic Fibres Ltd.
  • Triton Kaowool from the firm Morganite Ceramic Fibres Ltd.
  • the drawback is poorer mechanical strength than marinite, which results in the above problems regarding quality and short nozzle life.
  • strip casting machines represent a high degree of complexity, heavy, complicated designs requiring a lot of time in connection with replacement of nozzles and starting up the strip casting process.
  • economy of the process depends on a minimum of down time periods and quick achievement of uniform product quality after starting up the process.
  • Heavy nozzle holders comprising welded steel plates amounting to several hundred kilograms in weight also requires a larger operating crew on the strip cast machines, as well as capital investment in and maintenance of special equipment needed for assembling/disassembling of nozzles.
  • the object of the present invention is to provide a flexible, simple and easy casting system which minimalizes the disassembling and replacement time, reduces the required number of operators on the strip cast machines and at the same time increases the stand time of the nozzles.
  • a further object of the invention is to provide a casting system which results in a low-energy and high performance casting process at a lower rejection grade.
  • the continuous casting unit as shown in Fig. 1, comprises a transfer gutter (1) between a holding furnace (not shown in the figure) and a buffer crucible (2), a fireproof, lined gutter (3) that leads the molten metal to a metal levelling box (4), and further a distributor box (5) and feed channel (6) connected to the nozzle (7) that discharges into the cavity formed between the two rotating cylinders (8).
  • Solidified metal is shown behind the cylinders as a (pre)rolled strip.
  • the metal from the holding furnace e.g. aluminium or its alloys
  • a fireproof, lined gutter (1) to the crucible (2), shown in the cross-section in the figure as resistance heated, two-chamber crucible, that represents a metal buffer in the casting system.
  • This function is often combined with refining/purification and/or degassing of the metal at this stage.
  • the crucible is further provided with a temperature regulator (not shown in the figure) which is coupled to a heating device in order to ensure exact cast metal temperature control. A combination of fine temperature adjustment at this stage and extra-insulated metal gutters results in a low-energy casting process.
  • the treated metal is supplied in desired volume and at adjusted temperature to the levelling box (4) where the fine adjustment of the further metal flow takes place (adjustment equipment not shown in the figure).
  • the casting equipment itself includes the distributor box (5), the feed channel (6) and the nozzle (7) which is designed and dimensioned to achieve utmost uniformity in filling of the mould cavity between the cylinders (8) with uniform pressure and temperature distribution across the full width of the nozzle.
  • the nozzle (7) as shown in Fig. 2 comprises two symmetric exterior walls (71,72) with narrowed/inclined contour facing the cylinders (8) which is in conformity with the contour of the cylinders.
  • the exterior walls have been precast with all essential details, such as integrated spacer and deflector plate for uniform distribution of metal along the nozzle, in "Triton Kaowool" and with the surfaces of the inclined sections finely machined to exact tolerances.
  • This special design of the nozzle is disclosed in a co-pending patent application claiming priority from Norwegian Patent Application No. 83.3086
  • Marinite hitherto used In all essential aspects except for mechanical strength the material employed is superior to the Marinite hitherto used. "Triton Kaowool” is first and foremost less hygroscopic than Marinite, which eliminates special nozzle drying and storage in cabinet drier prior to installation and all special measures that had previously to be taken during start-up of the casting process. Furthermore, this material has better insulating characteristics, i.e. reduces thermal loss, and this further adds to the low-energy profile of the casting process. In addition, “Triton Kaowool” contains absolutely no asbestos fibre, and consequently it satisfies the heavy demands for occupational hygiene.
  • Fig. 2 shows a vertical cross-section through the nozzle (7) placed in a nozzle holder (12).
  • the nozzle holder is extruded with all the essential construction details and standard tolerances in hardened aluminium alloy and cut down in suitable lengths.
  • the surface of the extruded nozzle holder exhibits such a quality that all machining and/or surface treatment is redundant.
  • holes are merely bored and threaded to house the screws (13) which are applied to clamp (fasthold) the casting nozzle in the holder by means of a complementarily designed fastening wedge (15).
  • the fastening wedge is also extruded in hardened aluminium alloy and both these low-weight components, 11.6 and 2.7 kg per m of extruded length, respectively, represent a weight reduction of 80% compared to the known steel-based equipments. Furthermore, providing the nozzle holder in aluminium alloy offers an advantage. The broken/used holders are directly returned to the casting shop for remelting, and in this way the price of the nozzle holder is further reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Steroid Compounds (AREA)
  • Continuous Casting (AREA)
EP84109842A 1983-08-26 1984-08-17 Giesssystem Withdrawn EP0137238A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO833087 1983-08-26
NO833087A NO157849C (no) 1983-08-26 1983-08-26 Stoepesystem.

Publications (1)

Publication Number Publication Date
EP0137238A1 true EP0137238A1 (de) 1985-04-17

Family

ID=19887206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84109842A Withdrawn EP0137238A1 (de) 1983-08-26 1984-08-17 Giesssystem

Country Status (2)

Country Link
EP (1) EP0137238A1 (de)
NO (1) NO157849C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0625387A1 (de) * 1993-05-18 1994-11-23 Lauener Engineering Ltd. Bandgiessanlage für Metalle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405757A (en) * 1967-04-12 1968-10-15 Harvey Aluminum Inc Method and apparatus for continuous casting of metal between oppositely rotatable cooling rolls set generally one above the other
EP0072041A2 (de) * 1981-06-05 1983-02-16 Hoogovens Groep B.V. Vorrichtung zum Verbinden von einem Ausguss mit einem Tauchrohr, beide aus feuerfestem Stoff
EP0081303A1 (de) * 1981-12-04 1983-06-15 Air Products And Chemicals, Inc. Einrichtung für das Abschirmen von geschmolzenem Metall während des Giessens
EP0040072B1 (de) * 1980-05-09 1984-05-30 Battelle Development Corporation Vorrichtung zum Giessen eines Streifens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405757A (en) * 1967-04-12 1968-10-15 Harvey Aluminum Inc Method and apparatus for continuous casting of metal between oppositely rotatable cooling rolls set generally one above the other
EP0040072B1 (de) * 1980-05-09 1984-05-30 Battelle Development Corporation Vorrichtung zum Giessen eines Streifens
EP0072041A2 (de) * 1981-06-05 1983-02-16 Hoogovens Groep B.V. Vorrichtung zum Verbinden von einem Ausguss mit einem Tauchrohr, beide aus feuerfestem Stoff
EP0081303A1 (de) * 1981-12-04 1983-06-15 Air Products And Chemicals, Inc. Einrichtung für das Abschirmen von geschmolzenem Metall während des Giessens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0625387A1 (de) * 1993-05-18 1994-11-23 Lauener Engineering Ltd. Bandgiessanlage für Metalle
US5755274A (en) * 1993-05-18 1998-05-26 Pechiney Rhenalu Strip casting plant for metals

Also Published As

Publication number Publication date
NO157849B (no) 1988-02-22
NO157849C (no) 1988-06-01
NO833087L (no) 1985-02-27

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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

Designated state(s): AT BE CH DE FR GB IT LI NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19851218

RIN1 Information on inventor provided before grant (corrected)

Inventor name: RASMUSSEN, TRYGVE

Inventor name: VIK, PER KARE