EP1025932A1 - Procédé et dispositif d'alimentation de métal en fusion pour coulée continue entre deux cylindres - Google Patents

Procédé et dispositif d'alimentation de métal en fusion pour coulée continue entre deux cylindres Download PDF

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Publication number
EP1025932A1
EP1025932A1 EP99101998A EP99101998A EP1025932A1 EP 1025932 A1 EP1025932 A1 EP 1025932A1 EP 99101998 A EP99101998 A EP 99101998A EP 99101998 A EP99101998 A EP 99101998A EP 1025932 A1 EP1025932 A1 EP 1025932A1
Authority
EP
European Patent Office
Prior art keywords
molten metal
nozzle
flow
channels
tip
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Withdrawn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
EP99101998A
Other languages
German (de)
English (en)
Inventor
Philip Milroy Thomas
Peter George Grocock
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.)
Kvaerner Clecim Continuous Casting Ltd
Kvaerner Metals Continuous Casting Ltd
Original Assignee
Kvaerner Clecim Continuous Casting Ltd
Kvaerner Metals Continuous Casting Ltd
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 Kvaerner Clecim Continuous Casting Ltd, Kvaerner Metals Continuous Casting Ltd filed Critical Kvaerner Clecim Continuous Casting Ltd
Priority to EP99101998A priority Critical patent/EP1025932A1/fr
Publication of EP1025932A1 publication Critical patent/EP1025932A1/fr
Withdrawn legal-status Critical Current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

  • This invention relates to roll casting and, in particular, to a method and apparatus for feeding molten metal into a roll caster such as a twin roll caster.
  • Twin roll casting is an established technology for the production of metal strip.
  • the thickness of the cast strip In the case of aluminium alloys, it is usual for the thickness of the cast strip to be in the range 6 - 10 mm.
  • molten metal is fed into the bite of a pair of internally cooled, counter-rotating rolls. The molten metal solidifies in contact with the casting rolls and then undergoes a hot reduction before exiting the caster as solid strip.
  • Tips can be manufactured in a number of ways. They can be machined from solid or more normally fabricated from tip sections. Traditionally tip sections have been limited in width and as result multiple tip sections are joined together until the required width is achieved. These joined sections then form the top and bottom portions of the tip. The leading edge of the tip is profiled such that it approximates to the curvature of the casting rolls.
  • a typical feeder tip is shown schematically in Figure 1.
  • the tip is closed at each end by a profiled refractory component referred to as an end dam.
  • the end dam is profiled to accommodate the spreading of the molten metal that can occur before solidification is complete.
  • the interior of the tip can have one of two basic forms. Closed (baffled) tips are characterised by the presence of an array of baffles whereas open tips are generally free from baffles although it is usual to use spacers to maintain a parallel orifice at the exit of the tip.
  • the molten metal is fed from the reservoir of molten metal (referred to as the head box into the tip by means of a refractory tube).
  • molten metal referred to as the head box into the tip by means of a refractory tube.
  • tip designs have evolved by the modification of the size or position of baffles and it is accepted that a different design of tip will be required for different strip widths.
  • in closed tips both the shape and the positioning of the baffles is critical and even small errors in tip manufacture can result in sheet defects.
  • baffles In open tips, there is a complete absence of baffles, although it is usual for a number of "spacers" to be used.
  • the purpose of the spacers is to hold the top and bottom sections of the tip apart and maintain a parallel orifice at the tip exit.
  • the method of feeding metal into an open tip is different to that used for closed tips. In this case it is usual for the head box to be connected directly to the tip and for the width of the head box to be between 0.5 and 0.75 times the width of the tip.
  • a tip design will be described that overcomes the problems of traditional "closed” (baffled) tips and allows a predetermined temperature and pressure profile to be established in the tip.
  • the molten metal enters a front tip chamber arranged at the front tip area of the nozzle, after exiting the second and third channels and before exiting the nozzle.
  • the front tip area of the nozzle comprises a weir baffle arranged orthogonally to the flow of the molten metal.
  • a casting nozzle apparatus for feeding molten metal into a roll caster comprising a first entry channel arranged essentially parallel to the flow of the molten metal, characterised in that the nozzle comprises second and third channels also arranged essentially parallel to the flow of the molten metal and through which the flow of molten metal is divided before exiting the nozzle tip to enter the gap between casting rolls and that the molten metal enters a front tip chamber arranged at the front of the nozzle, after exiting the second and third channels and before exiting the nozzle.
  • the nozzle may include additional channels to separate the flow of molten metal further, the second channel leading into fourth and fifth channel and the third channel leading into sixth and seventh channels before entering the front tip chamber.
  • the casting process is considered in detail it can be shown that as the molten metal contacts the casting roll surface there is a sudden increase in the roll temperature.
  • the surface temperature of the shell can rise from ambient to a peak of several hundreds of degrees Celsius during the time the metal is in contact with the roll. Once the roll leaves this contact region the shell is cooled and the temperature falls. This cycle is repeated once every revolution of the caster roll. Once steady state casting conditions have been achieved, the return temperature of the casting rolls (i.e., the temperature of the casting roll immediately before the contact region) will be uniform.
  • Fig. 1 shows a prior art caster tip 1, with one end dam 2 removed, including a conventional tip section 3.
  • Fig. 2 shows a first embodiment of the invention in its simplest form of a nozzle 1 with a single entry channel 11 which divides into two separate exit channels 12 which exit into a front tip chamber 13 .
  • the front tip chamber comprises an overflow weir 14.
  • the two exit channels 12 are spaced an equal distance from the entry channel 11 such that the flow of metal is divided evenly into the two exit channels 12 and ensures an even flow profile across the nozzle tip.
  • Fig. 3 shows a second embodiment of the invention in which there are four exit channels 22 which are fed by two intermediate channels 23 which are in turn fed by a single entry channel 11.
  • the four exit channels 22 are spaced an equal distance from the intermediate channels entry 23 which are spaced an equal distance from the entry channel 11 such that the flow of metal is divided evenly into the four exit channels 22. It could, in some circumstances, be desirable to space the exit channels 22 at different distances to produce a different flow profile across the nozzle tip.
  • Fig. 4 shows an embodiment with eight exit channels 32 which are fed by a first set of four intermediate channels 33 which in turn are fed by a second set of two intermediate channels 34 which in turn is fed by a single entry port 11.
  • Fig. 5 shows an embodiment with two entry ports 11 each leading into eight exit channels via intermediate channels as is the case in figure 4.
  • the method and tip construction described ensures that the metal leaving the tip is at a uniform temperature across the whole of the tip width.
  • the principle adopted is one of multiple bifurcation.
  • metal is fed into the tip at a single point.
  • the metal flow is divided into two by a refractory baffle and the two streams of metal feed the left and right hand sides of the tip respectively.
  • these secondary streams reach the quartile positions the flow is again split using refractory baffles. This process is repeated, the total number of bifurcations being governed by the size of the refractory baffles and the overall length of the tip from front to back.
  • the metal is allowed to flow over a weir to minimise the risk of non uniformities in temperature.
  • This method of construction has a number of advantages over existing designs of closed tips:
  • the single point entry can be replaced by twin point entry, as shown in fig. 5, with the entry points being arranged at the quartile positions.
  • additional entry points can be employed.
  • multiple headboxes can be used and it is possible that metal of a different temperature could be fed to the extreme edges of the tip. This embodiment is described in detail later.
  • the material During roll casting it is usual for the material to "spread", i.e. the cast strip is wider than the orifice of the feeder tip and the amount of spread is a function of the freezing range of the alloy and the casting conditions.
  • the bulk of the strip undergoes an extrusion effect, i.e. the strip moves faster than the casting rolls, the material at the extreme edges of the strip spreads sideways. Due to the extra cooling at the strip edges, material at the edge of the strip tend to be thicker than the bulk of the strip. This material cracks as it attempts to deform along with the bulk of the strip.
  • One method of overcoming this problem would be to locally reduce the cooling effect of the casting rolls in the vicinity of the strip edges.
  • a more convenient method is to control the flow of metal in the feed tip such that the temperature of metal at the edges of the strip is hotter than the bulk material.
  • the tip can be made up from a number of sections with the baffling arranged to optimise the temperature distribution.
  • optimise the temperature distribution it is possible, for example, to arrange the temperature profile of the metal leaving the tip and contacting the roll such that the metal at the extreme edges of the tip are hotter than the bulk of the strip width. This is achieved by arranging for the head boxes feeding the edges of the strip to be heated so that the temperature of metal was higher than that used for the central regions.
  • Each of the head boxes feeding this composite tip would have its own dedicated level control device that would allow different metallostatic heads to be employed at the edges of the strip compared to the bulk of the strip.
  • An alternative approach is to use a single head box that is connected to the feeder tip by a plurality of feed tubes. Using this approach flow to various regions of the tip can be controlled by regulating the flow through each of the feed tubes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP99101998A 1999-02-01 1999-02-01 Procédé et dispositif d'alimentation de métal en fusion pour coulée continue entre deux cylindres Withdrawn EP1025932A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99101998A EP1025932A1 (fr) 1999-02-01 1999-02-01 Procédé et dispositif d'alimentation de métal en fusion pour coulée continue entre deux cylindres

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99101998A EP1025932A1 (fr) 1999-02-01 1999-02-01 Procédé et dispositif d'alimentation de métal en fusion pour coulée continue entre deux cylindres

Publications (1)

Publication Number Publication Date
EP1025932A1 true EP1025932A1 (fr) 2000-08-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99101998A Withdrawn EP1025932A1 (fr) 1999-02-01 1999-02-01 Procédé et dispositif d'alimentation de métal en fusion pour coulée continue entre deux cylindres

Country Status (1)

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EP (1) EP1025932A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111421118A (zh) * 2020-04-27 2020-07-17 贵州莹月帆铝制品有限公司 一种便于晶粒控制的铝合金铸轧机双铸嘴结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56144850A (en) * 1980-04-10 1981-11-11 Kawasaki Steel Corp Broad nozzle for production of quenched thin metallic strip
JPS57103761A (en) * 1980-12-17 1982-06-28 Matsushita Electric Ind Co Ltd Multipored nozzle for production of strip
DE3842789A1 (de) * 1987-12-21 1989-07-06 Ishikawajima Harima Heavy Ind Giessvorrichtung fuer eine zweiwalzen-stranggiessmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56144850A (en) * 1980-04-10 1981-11-11 Kawasaki Steel Corp Broad nozzle for production of quenched thin metallic strip
JPS57103761A (en) * 1980-12-17 1982-06-28 Matsushita Electric Ind Co Ltd Multipored nozzle for production of strip
DE3842789A1 (de) * 1987-12-21 1989-07-06 Ishikawajima Harima Heavy Ind Giessvorrichtung fuer eine zweiwalzen-stranggiessmaschine

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ANONYMUS: "Roll Caster Nozzle", RESEARCH DISCLOSURE., no. 290, June 1988 (1988-06-01), HAVANT GB, pages 409, XP002107783 *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 026 (M - 112) 16 February 1982 (1982-02-16) *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 196 (M - 161) 5 October 1982 (1982-10-05) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111421118A (zh) * 2020-04-27 2020-07-17 贵州莹月帆铝制品有限公司 一种便于晶粒控制的铝合金铸轧机双铸嘴结构

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