WO1994026443A1 - Coulee continue a deux cylindres - Google Patents

Coulee continue a deux cylindres Download PDF

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Publication number
WO1994026443A1
WO1994026443A1 PCT/GB1994/000993 GB9400993W WO9426443A1 WO 1994026443 A1 WO1994026443 A1 WO 1994026443A1 GB 9400993 W GB9400993 W GB 9400993W WO 9426443 A1 WO9426443 A1 WO 9426443A1
Authority
WO
WIPO (PCT)
Prior art keywords
rolls
bite
molten metal
nozzle
high frequency
Prior art date
Application number
PCT/GB1994/000993
Other languages
English (en)
Inventor
John David Hunt
David Vernon Edmonds
Peter George Grocock
Philip Milroy Thomas
Original Assignee
Davy Mckee (Poole) Limited
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 Davy Mckee (Poole) Limited filed Critical Davy Mckee (Poole) Limited
Publication of WO1994026443A1 publication Critical patent/WO1994026443A1/fr

Links

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

Definitions

  • molten metal is fed into the bite between a pair of counter- rotating cooled rolls.
  • the molten metal issuing from a nozzle contacts the cooled rolls it starts to solidify and, by the time the metal reaches the common centre-line of the two rolls, it is completely solid.
  • the transition from liquid to solid is characterised by the presence of three distinct regions - the liquid region; the region containing a mixture of solid and liquid, sometimes referred to as the mushy region; and the solid region.
  • the demarcation between the mushy region and the solid region is known as the solidus.
  • the extent of the mushy region is a function of the freezing range of the alloy in question, whereas the extent of the liquid region is a function of the casting conditions. For example, if the casting speed is increased or the position of the tip of the nozzle is moved closer to the common centre-line of the casting rolls, the solidus will move closer to the common centre-line of the rolls. Conversely, if the casting speed is reduced or the tip of the nozzle is moved away from the common centre-line of the casting rolls, the solidus will move away from the common centre-line of the rolls.
  • the position of the solidus lies in a plane substantially normal to the longitudinal axis of the strip , and that it is symmetrical with respect to the thickness of the strip being cast .
  • the position of the solidus is much more difficult to maintain i . e . the solidus becomes non-planar and/or asymmetrical .
  • a method of casting a metal strip comprises introducing molten metal into the bite between a pair of counter-rotating cooled rolls and the supply of molten metal to the bite is modulated at a uniform high frequency.
  • the supp ly o f mo lten meta l to the bite is modulated in a controlled way in order to bring about controlled instability in the mushy region. This can be brought about in a number of ways: for example, the outlet of the feeder nozzle may be subjected to vibration in the direction of casting or a high frequency modulation signal may be applied to a servo valve which controls the gap between the rolls in order to modulate the gap.
  • the speed of either or both of the rolls may be modulated. All these methods have the effect of producing a high frequency low amplitude disturbance applied to the molten metal and this results in the position of the solidus which extends across the width of the strip being substantially normal to, and symmetrical about, the longitudinal axis of the strip but the solidus has high frequency low amplitude perturbations. Perturbations of this form are much more desirable than the low frequency high amplitude perturbations which occur with the prior art casters.
  • a caster comprises two cooled rolls, drive means for rotating the rolls in counter-rotating manner, means for introducing molten metal into the bite between the rolls and means for modulating the supply of molten metal to the bite, said modulation being at a uniform high frequency.
  • Figure 1 is a diagrammatic side elevation of part of a two-roll caster
  • Figure 2A is a diagrammatic plan on the line II-II of Figure 1;
  • Figure 2B is an alternative plan similar to Figure 2A.
  • a pair of liquid cooled rolls 1, 3 are arranged one above the other with a bite between them.
  • a refractory nozzle 5 projects into the bite and the rolls are rotated in opposite directions by drive means indicated by reference 1' so that the part of the periphery of each roll adjacent the tip of the nozzle is rotating in the direction away from the nozzle.
  • molten metal 9 usually aluminium or aluminium alloy
  • molten metal 9 is introduced through the nozzle into the bite and, when the metal comes into contact with each of the cooled rolls, it starts to solidify and to form a skin and the skins are compressed at the position of minimum separation R of the rolls to produce strip 7.
  • the molten metal 9 issuing from the outlet of the nozzle 5 passes through a partially molten and partially solidified stage 11, also referred to as a mushy stage. From the mushy stage solidification is completed to form the solid sheet 7.
  • the liquid, mushy and solid sections 9, 11 and 7, respectively, are shown in Figure 2A.
  • the line separating the mushy section 11 from the solid section 7 is known as the solidus and, desirably, this solidus remains symmetrical (with respect to the thickness of the strip) in the same position across the entire width of the strip being cast. As shown in Figure 2A, however, in use, the solidus is subjected to perturbations indicated by broken lines 13. Where these perturbations occur, there is a defect formed in the surface of the strip material and, consequently, it is desirable that the perturbations should be removed as far as possible.
  • the high amplitude low frequency perturbations shown in Figure 2A are replaced by low amplitude high frequency perturbations shown by reference 13' in Figure 2B.
  • This low amplitude high frequency arrangement produces a macroscopically planar interface which is much more acceptable than the interface shown in Figure 2A.
  • a vibrator 15 may be connected to the tip of the nozzle 5 in order to vibrate the tip.
  • the molten metal contained within the nozzle can be agitated with ultrasonic or electromagnetic means.
  • a servo-valve (not shown) which controls the position of one or both of the rolls to thereby adjust the gap between the rolls of the caster may be operated at high frequency to modulate the roll gap and this too brings about the arrangement of the solidus which is shown in Figure 2B.
  • the substantially uniform solidus position across the width of the strip can also be obtained by modulating at high frequency the operating speed of one or both of the rolls of the caster, for example by modulating the speed of the drive means 1' .
  • the uniform high frequency at which the supply of molten metal to the bite is modulated is within the frequency range 15-25HZ, typically 20Hz.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

Une machine de coulée de bandes possède une paire de cylindres refroidis (1, 3) espacés, à contrarotation, et une tuyère (5) par laquelle le métal fondu (9) est introduit dans l'espace situé entre deux cylindres (1, 3). Ce procédé de coulée se caractérise par des étapes de modulation de l'amenée du métal fondu introduit dans l'espace situé entre les deux cylindres afin de produire un solidus d'une forme plus satisfaisante uniforme et symétrique.
PCT/GB1994/000993 1993-05-12 1994-05-09 Coulee continue a deux cylindres WO1994026443A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939309809A GB9309809D0 (en) 1993-05-12 1993-05-12 Two-roll continuous casting
GB9309809.3 1993-05-12

Publications (1)

Publication Number Publication Date
WO1994026443A1 true WO1994026443A1 (fr) 1994-11-24

Family

ID=10735366

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/000993 WO1994026443A1 (fr) 1993-05-12 1994-05-09 Coulee continue a deux cylindres

Country Status (2)

Country Link
GB (1) GB9309809D0 (fr)
WO (1) WO1994026443A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001096047A1 (fr) * 2000-06-15 2001-12-20 Ishikawajima-Harima Heavy Industries Company Limited Coulee de bandes
US6988530B2 (en) 2000-06-15 2006-01-24 Castrip Llc Strip casting
CN101239358B (zh) * 2008-03-06 2010-06-30 张明 双辊铸轧—热连轧方法及设备

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140721A (en) * 1983-06-01 1984-12-05 Alusuisse Process for feeding molten metal
US4694886A (en) * 1985-05-28 1987-09-22 Hitachi Zosen Corporation Horizontal continuous casting apparatus
DE3624114A1 (de) * 1986-07-17 1988-01-21 Max Planck Inst Eisenforschung Vorrichtung zum herstellen von auswalzbarem blech aus metallschmelze
JPS63126654A (ja) * 1986-11-14 1988-05-30 Nkk Corp 鋳片の連続鋳造方法
JPS63171251A (ja) * 1987-01-10 1988-07-15 Nippon Steel Corp 金属薄帯の連続鋳造方法及び装置
JPS63290654A (ja) * 1987-05-22 1988-11-28 Nisshin Steel Co Ltd 薄板連続鋳造方法
JPS63303655A (ja) * 1987-06-01 1988-12-12 Hitachi Zosen Corp 連続鋳造設備におけるロ−ル間隔制御装置
JPS6448643A (en) * 1987-08-17 1989-02-23 Nippon Kokan Kk Shifting mold type continuous casting apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140721A (en) * 1983-06-01 1984-12-05 Alusuisse Process for feeding molten metal
US4694886A (en) * 1985-05-28 1987-09-22 Hitachi Zosen Corporation Horizontal continuous casting apparatus
DE3624114A1 (de) * 1986-07-17 1988-01-21 Max Planck Inst Eisenforschung Vorrichtung zum herstellen von auswalzbarem blech aus metallschmelze
JPS63126654A (ja) * 1986-11-14 1988-05-30 Nkk Corp 鋳片の連続鋳造方法
JPS63171251A (ja) * 1987-01-10 1988-07-15 Nippon Steel Corp 金属薄帯の連続鋳造方法及び装置
JPS63290654A (ja) * 1987-05-22 1988-11-28 Nisshin Steel Co Ltd 薄板連続鋳造方法
JPS63303655A (ja) * 1987-06-01 1988-12-12 Hitachi Zosen Corp 連続鋳造設備におけるロ−ル間隔制御装置
JPS6448643A (en) * 1987-08-17 1989-02-23 Nippon Kokan Kk Shifting mold type continuous casting apparatus

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 12, no. 376 (M - 750) 7 October 1988 (1988-10-07) *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 437 (M - 765) 17 November 1988 (1988-11-17) *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 100 (M - 805) 9 March 1989 (1989-03-09) *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 140 (M - 810) 6 April 1989 (1989-04-06) *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 237 (M - 833) 5 June 1989 (1989-06-05) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001096047A1 (fr) * 2000-06-15 2001-12-20 Ishikawajima-Harima Heavy Industries Company Limited Coulee de bandes
US6536506B2 (en) 2000-06-15 2003-03-25 Castrip Llc Strip casting
US6988530B2 (en) 2000-06-15 2006-01-24 Castrip Llc Strip casting
CN101239358B (zh) * 2008-03-06 2010-06-30 张明 双辊铸轧—热连轧方法及设备

Also Published As

Publication number Publication date
GB9309809D0 (en) 1993-06-23

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