EP0485331B1 - Procédé et dispositif pour la coulée électromagnétique de billettes en aluminium allié présentant une surface dénuée de plis - Google Patents

Procédé et dispositif pour la coulée électromagnétique de billettes en aluminium allié présentant une surface dénuée de plis Download PDF

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Publication number
EP0485331B1
EP0485331B1 EP91810822A EP91810822A EP0485331B1 EP 0485331 B1 EP0485331 B1 EP 0485331B1 EP 91810822 A EP91810822 A EP 91810822A EP 91810822 A EP91810822 A EP 91810822A EP 0485331 B1 EP0485331 B1 EP 0485331B1
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EP
European Patent Office
Prior art keywords
oxide
weir
inductor
process according
billet
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.)
Expired - Lifetime
Application number
EP91810822A
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German (de)
English (en)
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EP0485331A1 (fr
Inventor
Bertrand Carrupt
Maurice Constantin
Michel Ebener
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.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services 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 Alusuisse Lonza Services Ltd filed Critical Alusuisse Lonza Services Ltd
Priority to AT91810822T priority Critical patent/ATE100004T1/de
Publication of EP0485331A1 publication Critical patent/EP0485331A1/fr
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Publication of EP0485331B1 publication Critical patent/EP0485331B1/fr
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    • 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
    • B22D11/01—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces
    • B22D11/015—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces using magnetic field for conformation, i.e. the metal is not in contact with a mould

Definitions

  • the invention relates to a method for preventing the formation of wrinkles and oxide deposits on the rolling surfaces of a billet made of an aluminum alloy, in particular an aluminum-magnesium alloy, during vertical electromagnetic continuous casting with an essentially rectangular inductor and an oxide weir immersed in the melt head of the billet.
  • An apparatus for performing the method according to the preamble of claim 8 also lies within the scope of the invention.
  • US-A-4'724'896 discloses a device for reducing the surface defects mentioned in the electromagnetic casting of rolled ingots by arranging an oxide weir which is known per se and is immersed in the melt head, also called skim dam in technical jargon.
  • the outer edges of the oxide weir form an angle between 105 and 150 with the metal melt, as a result of which the meniscus radius of the surface of the metal melt in the contact zone with the oxide weir outer edges is greatly reduced.
  • the oxide skin which forms on the melt surface is to tear off at short intervals before the oxide layer has reached the thickness which is critical for the formation of wrinkles and oxide deposition. It has However, it has been shown that even with inclined outer edges of the oxide weir, the surface defects cannot be completely eliminated.
  • the inventor has set itself the goal of providing a method and a suitable device of the type mentioned at the outset with which the formation of wrinkles and oxide deposition on the surface of rolled bars made of aluminum alloys produced by electromagnetic casting can be prevented.
  • the object is achieved according to the invention in that the oxide weir, which extends at least over the long sides of the inductor and is arranged approximately parallel and at a distance from it, is moved horizontally in its longitudinal direction to and fro.
  • the oxide weir can consist of only two parts adjacent to the long sides of the inductor and are missing towards the transverse sides of the inductor. In practice, however, it is advisable to use a frame-shaped oxide weir. The constant movement of the oxide weir prevents the formation of wrinkles and oxide deposits on the rolled surfaces of the ingots by premature tearing and detachment of the oxide skin that forms on the melt surface.
  • a movement cycle should expediently last from 1 to 8 seconds, preferably about 3 seconds, the horizontal displacement of the oxide weir between two end positions being 5 to 15 mm, preferably about 8 mm.
  • the aforementioned premature detachment of the oxide skin on the melt surface can be supported by introducing vibrations into the oxide weir in the direction of strand withdrawal.
  • the suitable vibration frequency is between 50 and 1000 Hz, preferably around 400 to 600 Hz.
  • the optimal acceleration value of the vibration movement is between +/- 20 g and +/- 60 g, where g means the acceleration due to gravity.
  • the appropriate immersion depth of the oxide weir in the molten metal is 5 to 15 mm, preferably about 10 mm.
  • the object is achieved according to the invention in that, in the case of an essentially rectangular inductor and an essentially rectangular oxide weir, this is fixed to a support frame which is coupled on one side to a pneumatic cylinder which is stationary with respect to the inductor and on the other in a position opposite the inductor fixed leadership is guided.
  • At least one vibrator preferably a ball vibrator, is attached to the support frame.
  • the distance between the longitudinal sides of the inductor and the oxide weir lying essentially parallel to one another is expediently between 50 and 100 mm and is preferably approximately 70 to 80 mm.
  • a vertical electromagnetic continuous casting installation 10 has a loop-shaped inductor 12, which is partially covered by a screen 14 for the fine adjustment of the electromagnetic field.
  • An annularly arranged coolant box 16 is used to apply coolant 18 to the surface of the strand or roll ingot 20 emerging from the mold. Via a pouring nozzle 21 the liquid metal is fed to the mold.
  • the strand 20 is continuously lowered by means of a start-up floor 22, which keeps the mold closed until the start of casting.
  • a pneumatic cylinder 30 is mounted, the piston rod 32 is connected to a first suspension 34 a of the support frame 24.
  • a second suspension 34 b of the support frame 24 opposite the first suspension 34 a is supported in a guide 36 mounted on the side of the coolant box 16 diametrically opposite the pneumatic cylinder 30.
  • the distance b between the long sides x1 and x2 of the inductor 12 and the oxide weir 26 is thus 80 mm, the distance c between the transverse sides y1 and y2 90 mm.
  • the support frame 24 with the oxide weir 26 can be moved horizontally in the direction of the long sides x 1 of the inductor 12 back and forth.
  • Ball vibrators 40 are fixed on crossbars 38 of the support frame 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • General Induction Heating (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Conductive Materials (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Claims (10)

  1. Procédé pour empêcher la formation de plis et le dépôt d'oxydes sur les surfaces de laminage d'une billette pour laminage (20) en alliage d'aluminium, en particulier en alliage aluminium-magnésium, au cours de la coulée continue électromagnétique verticale à l'aide d'un inducteur (12) sensiblement rectangulaire et d'un piège à scorie (26) plongeant dans la tête de fusion (28) de la billette pour laminage (20), caractérisé en ce que le piège à scorie (26) qui s'étend au moins sur les côtés longitudinaux (x₁) de l'inducteur (12) et qui est disposé parallèlement et à distance (b) de ceux-ci est déplacé horizontalement dans un sens et dans l'autre dans sa direction longitudinale (m).
  2. Procédé selon la revendication 1, caractérisé en ce qu'un cycle de mouvement se déroule en 1 à 8 s, de préférence en environ 3 s.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le déplacement horizontal du piège à scorie (26) entre deux positions terminales est de 5 à 15 mm, de préférence d'environ 8 mm.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le piège à scorie (26) est amené à vibrer en direction verticale.
  5. Procédé selon la revendication 4, caractérisé en ce que la fréquence de vibration est de 50 à 1 000 Hz, de préférence de 400 à 600 Hz.
  6. Procédé selon la revendication 4 ou 5, caractérisé en ce que l'accélération du mouvement de vibration est comprise entre ± 20 g et ± 60 g.
  7. Procédé selon au moins l'une des revendications 1 à 6, caractérisé en ce que la profondeur de plongée du piège à scorie (26) dans la tête de fusion (28) est de 5 à 15 mm, de préférence d'environ 10 mm.
  8. Dispositif pour la mise en oeuvre du procédé selon l'une des revendications 1 à 7 dans une installation de coulée continue électromagnétique verticale (10) avec un inducteur (12) sensiblement rectangulaire et un piège à scorie (26) sensiblement rectangulaire qui plonge dans la tête de fusion (28) de la billette pour laminage (20), caractérisé en ce que le piège à scorie (26) est fixé sur un cadre support (24) qui est couplé à une extrémité à un cylindre pneumatique (30) fixe par rapport à l'inducteur et qui est guidé à l'autre extrémité dans un guide (36) fixe par rapport à l'inducteur (12).
  9. Dispositif selon la revendication 8, caractérisé en ce qu'au moins un vibrateur (40), de préférence un vibrateur à billes, est fixé sur le cadre support (24).
  10. Dispositif selon la revendication 8 ou 9, caractérisé en ce que la distance (b) entre les côtés longitudinaux (x₁, x₂), sensiblement parallèles entre eux, de l'inducteur (12) et du piège à scorie (26) est de 50 à 100 mm, de préférence d'environ 70 à 80 mm.
EP91810822A 1990-11-06 1991-10-24 Procédé et dispositif pour la coulée électromagnétique de billettes en aluminium allié présentant une surface dénuée de plis Expired - Lifetime EP0485331B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91810822T ATE100004T1 (de) 1990-11-06 1991-10-24 Verfahren und vorrichtung zum elektromagnetischen giessen von walzbarren mit faltenfreier oberflaeche aus einer aluminiumlegierung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3522/90 1990-11-06
CH3522/90A CH682467A5 (de) 1990-11-06 1990-11-06 Verfahren und Vorrichtung zum elektromagnetischen Giessen von Walzbarren aus einer Aluminiumlegierung mit faltenfreier Oberfläche.

Publications (2)

Publication Number Publication Date
EP0485331A1 EP0485331A1 (fr) 1992-05-13
EP0485331B1 true EP0485331B1 (fr) 1994-01-12

Family

ID=4257827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91810822A Expired - Lifetime EP0485331B1 (fr) 1990-11-06 1991-10-24 Procédé et dispositif pour la coulée électromagnétique de billettes en aluminium allié présentant une surface dénuée de plis

Country Status (11)

Country Link
US (1) US5184667A (fr)
EP (1) EP0485331B1 (fr)
JP (1) JPH04266453A (fr)
AT (1) ATE100004T1 (fr)
AU (1) AU640055B2 (fr)
CA (1) CA2054489A1 (fr)
CH (1) CH682467A5 (fr)
DE (1) DE59100852D1 (fr)
ES (1) ES2049098T3 (fr)
NO (1) NO176596C (fr)
ZA (1) ZA918481B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3110583A4 (fr) * 2014-02-24 2017-10-18 Wagstaff, Inc. Système de contrôle des oxydes pour un moule de coulée continue de métal fondu

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2295839C (fr) 1997-07-10 2008-04-08 Wagstaff, Inc. Systeme permettant d'assurer un ecoulement uniforme a travers plusieurs parois peripheriques permeables d'un moule
BR0114943A (pt) * 2000-10-27 2004-02-25 Univ Ohio State Sistema de vaso para metal derretido para moldar metal derretido, métodos de fornecer um escoamento de metal derretido para lingotamento contìnuo, e de melhorar a qualidade de um método de lingotamento contìnuo de metal
JP2025509975A (ja) * 2022-03-24 2025-04-11 ノベリス・インコーポレイテッド ダイレクトチル鋳造中に垂直湯じわを制御するためのシステム及び方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4273180A (en) * 1979-03-08 1981-06-16 Tertishnikov Anatoly S Process and apparatus for continuous casting of metal in electromagnetic field
US4724896A (en) * 1987-02-09 1988-02-16 Aluminum Company Of America Apparatus and method for improving the surface characteristics of continuously cast metal ingot
US4989666A (en) * 1988-12-22 1991-02-05 Swiss Aluminium Ltd. Process and device for electromagnetically casting metals
JPH02255246A (ja) * 1989-03-29 1990-10-16 Sumitomo Light Metal Ind Ltd 電磁場鋳造方法及び装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3110583A4 (fr) * 2014-02-24 2017-10-18 Wagstaff, Inc. Système de contrôle des oxydes pour un moule de coulée continue de métal fondu

Also Published As

Publication number Publication date
ZA918481B (en) 1992-07-29
ATE100004T1 (de) 1994-01-15
EP0485331A1 (fr) 1992-05-13
CH682467A5 (de) 1993-09-30
NO914309L (no) 1992-05-07
CA2054489A1 (fr) 1992-05-07
AU640055B2 (en) 1993-08-12
AU8607991A (en) 1992-05-14
NO914309D0 (no) 1991-11-04
ES2049098T3 (es) 1994-04-01
NO176596C (no) 1995-05-03
DE59100852D1 (de) 1994-02-24
JPH04266453A (ja) 1992-09-22
NO176596B (no) 1995-01-23
US5184667A (en) 1993-02-09

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