EP0375620A1 - Method and device for electromagnetically casting metals - Google Patents

Method and device for electromagnetically casting metals Download PDF

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Publication number
EP0375620A1
EP0375620A1 EP89810960A EP89810960A EP0375620A1 EP 0375620 A1 EP0375620 A1 EP 0375620A1 EP 89810960 A EP89810960 A EP 89810960A EP 89810960 A EP89810960 A EP 89810960A EP 0375620 A1 EP0375620 A1 EP 0375620A1
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EP
European Patent Office
Prior art keywords
ingot
agitator
longitudinal axis
inlet system
bar
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.)
Granted
Application number
EP89810960A
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German (de)
French (fr)
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EP0375620B1 (en
Inventor
Jean-Claude Weber
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
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Publication date
Application filed by Alusuisse Lonza Services Ltd filed Critical Alusuisse Lonza Services Ltd
Priority to AT89810960T priority Critical patent/ATE88120T1/en
Publication of EP0375620A1 publication Critical patent/EP0375620A1/en
Application granted granted Critical
Publication of EP0375620B1 publication Critical patent/EP0375620B1/en
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Expired - Lifetime legal-status Critical Current

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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 the vertical electromagnetic casting of round or hollow round bars, in particular of aluminum and aluminum alloys.
  • An apparatus for performing the method is also within the scope of the invention.
  • the inventor has set itself the goal of creating a method and a suitable device with which a more uniform metal supply and cooling can be achieved.
  • the object is achieved in that the ingot rotates about its longitudinal axis during the casting process. This symmetrizes the metal feed and the strand cooling.
  • the method according to the invention is therefore suitable for the electromagnetic casting of large-sized bars.
  • the geometric tolerances for these cast products are also better.
  • the cell structure is more uniform over the bar cross section.
  • the speed of the rotating start-up floor is preferably in the range between 0.1 and 200 Hz.
  • the speed is dependent on the application and the bar format. Low to medium speeds are used if shape consistency and uniform cooling of the ingot as well as a uniform cell structure are to be achieved. Medium to high speeds are also particularly suitable for stirring in additives such as SiC fibers.
  • liquid part of the ingot can be stirred using a stationary agitator that is firmly connected to the metal inlet system.
  • the object is achieved by means of an electromagnetic mold with a metal infeed system and start-up base, the start-up base being rotatably mounted about the longitudinal axis of the bar.
  • a stationary agitator immersed in the liquid part of the bar can be attached to the metal inlet system.
  • An agitator can consist, for example, of a circular plate with teeth.
  • the agitator consists of at least one plate arranged vertically and symmetrically to the longitudinal axis of the ingot.
  • a stationary agitator 8 immersed in the liquid part of the bar 7 is fixed on the float 3.
  • the stirring effect is brought about by the rotation of the rotatably mounted starting plate 6 about the bar axis x.
  • the agitator 8 in this case has any baffles which lie transversely to the flow direction of the metal which is moved by the rotation in the liquid part of the bar 7.
  • the agitator 8 is designed as a circular plate 9 with teeth 10.
  • the agitator 8 consists of two plates 11 arranged vertically and symmetrically about the longitudinal axis x of the bar 7.
  • the agitator 8 according to FIG. 4 has the shape of a propeller with two screw blades 12.
  • the screw axis lies in the longitudinal axis x of the bar 7.

Abstract

In a process for electromagnetic casting of round and hollow ingots, in particular such of aluminum and aluminum alloys, the ingot (7) is rotated about its longitudinal axis (x) during casting. This is achieved by way of a rotatable dummy base (6). With that the metal feed and cooling of the ingot is made symmetrical and, as a result, a more uniform shape is obtained and a more uniform cell structure across the ingot cross-section. In order to promote a stronger stirring effect, a stationary stirrer (8) dipping into the molten part of the ingot (7) can be provided attached to the metal inlet system (3).

Description

Die Erfindung betrifft ein Verfahren zum vertikalen elek­tromagnetischen Giessen von Rund- bzw. Hohlrundbarren, ins­besondere aus Aluminium und Aluminiumlegierungen. Im Rahmen der Erfindung liegt auch eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for the vertical electromagnetic casting of round or hollow round bars, in particular of aluminum and aluminum alloys. An apparatus for performing the method is also within the scope of the invention.

Ein ungünstiges Metalleinlaufsystem sowie eine ungleichmäs­sige Spritzwasserkühlung führen oft zu einer Qualitätsmin­derung der Giessprodukte. Hierbei ergibt sich beispiels­weise ein ungleichmässiges Zellgefüge oder sogar Ausschuss infolge Kalt/Warm-Risse, was im Extremfall einen Giessab­bruch zu Folge hat. Der negative Einfluss des Metallein­laufsystems und der Spritzwasserkühlung auf die Qualität des zu giessenden Barrens nimmt mit kleinerer Giessge­schwindigkeit noch zu; dies ist vor allem der Fall beim Giessen von grossformatigen Pressbarren.An unfavorable metal inlet system and uneven spray water cooling often lead to a reduction in the quality of the cast products. This results, for example, in an uneven cell structure or even rejects due to cold / warm cracks, which in extreme cases results in the casting being stopped. The negative influence of the metal inlet system and the spray water cooling on the quality of the ingot to be cast increases with the slower casting speed; this is especially the case when casting large-sized press bars.

Angesichts dieser Gegebenheiten hat sich der Erfinder das Ziel gesetzt, ein Verfahren sowie eine geeignete Vorrich­tung zu schaffen, mit welchem eine gleichmässigere Metall­zufuhr und Kühlung erzielt werden kann.In view of these circumstances, the inventor has set itself the goal of creating a method and a suitable device with which a more uniform metal supply and cooling can be achieved.

Bezüglich des Verfahrens wird die Aufgabe dadurch gelöst, dass der Barren während des Giessvorgangs um seine Längs­achse rotiert. Damit wird die Metallspeisung sowie die Strangkühlung symmetrisiert. Das erfindungsgemässe Verfah­ren ist demzufolge geeignet für das elektromagnetische Giessen von grossformatigen Barren. Zusätzlich sind auch die geometrischen Toleranzen für diese Giessprodukte besser. Darüber hinaus ist bei erfindungsgemäss gegossenen Barren das Zellgefüge über den Barrenquerschnitt gleich­mässiger.With regard to the method, the object is achieved in that the ingot rotates about its longitudinal axis during the casting process. This symmetrizes the metal feed and the strand cooling. The method according to the invention is therefore suitable for the electromagnetic casting of large-sized bars. In addition, the geometric tolerances for these cast products are also better. In addition, in the case of bars cast according to the invention, the cell structure is more uniform over the bar cross section.

Bevorzugt liegt die Drehzahl des rotierenden Anfahrbodens im Bereich zwischen 0,1 und 200 Hz. Die Drehzahl ist hier­bei abhängig von der Anwendung und vom Barrenformat. Tiefe bis mittlere Drehzahlen werden angewendet, wenn Form­konstanz und gleichmässige Kühlung des Barrens sowie ein gleichmässiges Zellgefüge erzielt werden soll. Mittlere bis höhere Drehzahlen eignen sich insbesondere auch zum Ein­rühren von Zusatzstoffen wie beispielsweise SiC-Fasern.The speed of the rotating start-up floor is preferably in the range between 0.1 and 200 Hz. The speed is dependent on the application and the bar format. Low to medium speeds are used if shape consistency and uniform cooling of the ingot as well as a uniform cell structure are to be achieved. Medium to high speeds are also particularly suitable for stirring in additives such as SiC fibers.

Zusätzlich kann der flüssige Teil des Barrens mittels eines mit dem Metalleinlaufsystem fest verbundenen stationären Rührwerks gerührt werden.In addition, the liquid part of the ingot can be stirred using a stationary agitator that is firmly connected to the metal inlet system.

In Bezug auf die Vorrichtung wird die gestellte Aufgabe ge­löst mittels einer elektromagnetischen Kokille mit Metall­einlaufsystem und Anfahrboden, wobei der Anfahrboden um die Barrenlängsachse drehbar gelagert ist.With regard to the device, the object is achieved by means of an electromagnetic mold with a metal infeed system and start-up base, the start-up base being rotatably mounted about the longitudinal axis of the bar.

Durch die blosse Rotationsbewegung des Anfahrbodens wird bereits die Formkonstanz und die gleichmässige Kühlung des Barrens erreicht. Zur Verstärkung des Rühreffekts kann am Metalleinlaufsystem ein in den flüssigen Teil des Barrens eintauchendes stationäres Rührwerk befestigt sein.The mere rotational movement of the approach floor already ensures the shape consistency and the even cooling of the ingot. To reinforce the stirring effect, a stationary agitator immersed in the liquid part of the bar can be attached to the metal inlet system.

Als Rührwerk geeignet sind irgendwelche Schikanen, welche in den flüssigen Teil des Barrens und quer zur Rotations­strömung des Metalls eintauchen. Ein Rührwerk kann bei­spielsweise aus einer kreisrunden Platte mit Zahnung be­stehen.Any baffles which are immersed in the liquid part of the bar and transversely to the rotational flow of the metal are suitable as agitators. An agitator can consist, for example, of a circular plate with teeth.

Eine andere Variante wird darin gesehen, dass das Rührwerk aus mindestens einer vertikal und symmetrisch zur Längs­achse des Barrens angeordneten Platte besteht.Another variant is seen in that the agitator consists of at least one plate arranged vertically and symmetrically to the longitudinal axis of the ingot.

Eine weitere Möglichkeit ist die Ausbildung des Rührwerks analog einer Schiffsschraube, wobei die Schraubenachse in der Längsachse des Barrens liegt.Another possibility is the design of the agitator analogous to a propeller, the screw axis being in the longitudinal axis of the ingot.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsformen sowie anhand der Zeichnung; diese zeigt in

  • Fig. 1 den Querschnitt durch eine erfindungsgemässe Vor­richtung;
  • Fig. 2 die Draufsicht auf ein erfindungsgemässes Rührwerk;
  • Fig. 3 die Schrägsicht auf ein anderes erfindungsgemässes Rührwerk;
  • Fig. 4 die Schrägsicht auf ein weiteres erfindungsgemässes Rührwerk.
Further advantages, features and details of the invention result from the following description of preferred embodiments and from the drawing; this shows in
  • 1 shows the cross section through an inventive device.
  • 2 shows the top view of an agitator according to the invention;
  • 3 shows the oblique view of another agitator according to the invention;
  • Fig. 4 is an oblique view of another agitator according to the invention.

Eine elektromagnetische Stranggiessanlage besteht gemäss Fig. 1 im wesentlichen aus einem Induktor 1, einem Schirm 2, einer -- in der Zeichnung nicht dargestellten -- Spritz­wasserkühlung, einem Metalleinlaufsystem oder Schwimmer 3, einer Giessdüse 4 zur Schmelzezufuhr, einem Niveausensor 5 zur Regelung des Metallstands in der Kokille sowie einem Anfahrboden 6. Am Schwimmer 3 ist ein in den flüssigen Teil des Barrens 7 eintauchendes stationäres Rührwerk 8 festge­legt. Der Rühreffekt wird bewirkt durch die Rotation des drehbar gelagerten Anfahrbodens 6 um die Barrenachse x. Das Rührwerk 8 weist hierbei irgendwelche Schikanen auf, die quer zur durch die Rotation bewegten Strömungsrichtung des Metalls im flüssigen Teil des Barrens 7 liegen.1 essentially consists of an inductor 1, a screen 2, a spray water cooling system (not shown in the drawing), a metal inlet system or float 3, a pouring nozzle 4 for supplying the melt, and a level sensor 5 for regulating the metal level in the mold and a start-up base 6. A stationary agitator 8 immersed in the liquid part of the bar 7 is fixed on the float 3. The stirring effect is brought about by the rotation of the rotatably mounted starting plate 6 about the bar axis x. The agitator 8 in this case has any baffles which lie transversely to the flow direction of the metal which is moved by the rotation in the liquid part of the bar 7.

In Fig. 2 ist das Rührwerk 8 als kreisrunde Platte 9 mit Zahnung 10 ausgebildet.2, the agitator 8 is designed as a circular plate 9 with teeth 10.

Gemäss Fig. 3 besteht das Rührwerk 8 aus zwei vertikal und symmetrisch der Längsachse x des Barrens 7 angeordneten Platten 11.3, the agitator 8 consists of two plates 11 arranged vertically and symmetrically about the longitudinal axis x of the bar 7.

Das Rührwerk 8 nach Fig. 4 weist die Form einer Schiffs­schraube mit zwei Schraubenblättern 12 auf. Die Schrauben­achse liegt hierbei in der Längachse x des Barrens 7.The agitator 8 according to FIG. 4 has the shape of a propeller with two screw blades 12. The screw axis lies in the longitudinal axis x of the bar 7.

Claims (8)

1. Verfahren zum vertikalen elektromagnetischen Giessen von Rund- bwz. Hohlrundbarren, insbesondere aus Alumi­nium und Aluminiumlegierungen,
dadurch gekennzeichnet,
dass der Barren während des Giessvorgangs um seine Längsachse (x) rotiert.1. Process for the vertical electromagnetic casting of round or Hollow round bars, especially made of aluminum and aluminum alloys,
characterized,
that the ingot rotates about its longitudinal axis (x) during the casting process. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Barren mit einer Drehzahl von 0,1 bis 200 Hz ro­tiert.2. The method according to claim 1, characterized in that the ingot rotates at a speed of 0.1 to 200 Hz. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeich­net, dass der flüssige Teil des Barrens (7) mittels eines mit dem Metalleinlaufsystem (3) fest verbundenen stationären Rührwerks (8) gerührt wird.3. The method according to claim 1 or 2, characterized in that the liquid part of the ingot (7) is stirred by means of a stationary agitator (8) fixedly connected to the metal inlet system (3). 4. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 3, mittels einer elektromagne­tischen Kokille mit Metalleinlaufsystem (3) und Anfahr­boden (6), dadurch gekennzeichnet, dass der Anfahrboden (6) um die Längsachse (x) des Barrens (7) drehbar gela­gert ist.4. Device for performing the method according to one of claims 1 to 3, by means of an electromagnetic mold with a metal inlet system (3) and start-up base (6), characterized in that the start-up base (6) about the longitudinal axis (x) of the ingot (7) is rotatably mounted. 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass am Metalleinlaufsystem (3) ein in den flüssigen Teil des Barrens (7) eintauchendes stationäres Rührwerk (8) befestigt ist.5. The device according to claim 4, characterized in that on the metal inlet system (3) in the liquid part of the bar (7) immersed stationary agitator (8) is attached. 6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das Rührwerk (8) aus einer kreisrunden Platte (9) mit Zahnung (10) besteht (Fig. 2).6. The device according to claim 5, characterized in that the agitator (8) consists of a circular plate (9) with teeth (10) (Fig. 2). 7. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das Rührwerk (8) aus mindestens einer vertikal und symmetrisch zur Längsachse (x) des Barrens (7) ange­ordneten Platte (11) besteht (Fig. 3).7. The device according to claim 5, characterized in that the agitator (8) consists of at least one vertically and symmetrically to the longitudinal axis (x) of the bar (7) arranged plate (11) (Fig. 3). 8. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das Rührwerk (8) analog einer Schiffsschraube (12) ausgebildet ist, wobei die Schraubenachse in der Längs­achse (x) des Barrens (7) liegt (Fig. 4).8. The device according to claim 5, characterized in that the agitator (8) is designed analogously to a propeller (12), the screw axis being in the longitudinal axis (x) of the ingot (7) (FIG. 4).
EP89810960A 1988-12-22 1989-12-14 Method and device for electromagnetically casting metals Expired - Lifetime EP0375620B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89810960T ATE88120T1 (en) 1988-12-22 1989-12-14 METHOD AND DEVICE FOR ELECTROMAGNETIC CASTING OF METALS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH475288 1988-12-22
CH4752/88 1988-12-22

Publications (2)

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EP0375620A1 true EP0375620A1 (en) 1990-06-27
EP0375620B1 EP0375620B1 (en) 1993-04-14

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EP89810960A Expired - Lifetime EP0375620B1 (en) 1988-12-22 1989-12-14 Method and device for electromagnetically casting metals

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US (1) US4989666A (en)
EP (1) EP0375620B1 (en)
JP (1) JPH02211938A (en)
AT (1) ATE88120T1 (en)
AU (1) AU626615B2 (en)
CA (1) CA2005816A1 (en)
DE (1) DE58904078D1 (en)
ES (1) ES2041034T3 (en)
GR (1) GR3007662T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0485331A1 (en) * 1990-11-06 1992-05-13 Alusuisse-Lonza Services Ag Process and installation for electromagnetic casting of aluminium alloyed billets having a fold-free surface

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5275229A (en) * 1992-03-25 1994-01-04 Inductotherm Corp. Magnetic suspension melting apparatus
CN103555976A (en) * 2013-11-04 2014-02-05 张家港市昊天金属科技有限公司 Aluminum bar smelting and casting process
DE102017108394A1 (en) * 2017-04-20 2018-10-25 Inteco Melting And Casting Technologies Gmbh Method and device for producing cast blocks from metal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702630A (en) * 1971-01-05 1972-11-14 Centrifugation Soc Civ De Apparatus for casting solid cylindrical metallic objects
US4612972A (en) * 1982-01-04 1986-09-23 Olin Corporation Method and apparatus for electro-magnetic casting of complex shapes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702630A (en) * 1971-01-05 1972-11-14 Centrifugation Soc Civ De Apparatus for casting solid cylindrical metallic objects
US4612972A (en) * 1982-01-04 1986-09-23 Olin Corporation Method and apparatus for electro-magnetic casting of complex shapes

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 7, Nr. 207 (M-242)[1352], 15. September 1983; JP-A-58 103 946 (NIPPON KOKAN K.K.) 21-06-1983 *
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 50 (M-281)[1487], 7. März 1984; & JP-A-58 202 957 (NIPPON KOKAN K.K.) 26-11-193 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0485331A1 (en) * 1990-11-06 1992-05-13 Alusuisse-Lonza Services Ag Process and installation for electromagnetic casting of aluminium alloyed billets having a fold-free surface
US5184667A (en) * 1990-11-06 1993-02-09 Alusuisse-Lonza Services Ltd. Process and installation for the electromagnetic casting of rolled bars from an aluminum alloy having a ripplefree surface
CH682467A5 (en) * 1990-11-06 1993-09-30 Alusuisse Lonza Services Ag Method and apparatus for electromagnetic casting of rolling ingots of aluminum alloy with wrinkle-free surface.

Also Published As

Publication number Publication date
ATE88120T1 (en) 1993-04-15
JPH02211938A (en) 1990-08-23
AU626615B2 (en) 1992-08-06
GR3007662T3 (en) 1993-08-31
CA2005816A1 (en) 1990-06-22
US4989666A (en) 1991-02-05
AU4619789A (en) 1990-06-28
DE58904078D1 (en) 1993-05-19
ES2041034T3 (en) 1993-11-01
EP0375620B1 (en) 1993-04-14

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