EP0493318A1 - Process for manufacturing a liquid-solid metallic material, suitable for further working up in thixotropic state - Google Patents

Process for manufacturing a liquid-solid metallic material, suitable for further working up in thixotropic state Download PDF

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Publication number
EP0493318A1
EP0493318A1 EP91810961A EP91810961A EP0493318A1 EP 0493318 A1 EP0493318 A1 EP 0493318A1 EP 91810961 A EP91810961 A EP 91810961A EP 91810961 A EP91810961 A EP 91810961A EP 0493318 A1 EP0493318 A1 EP 0493318A1
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Prior art keywords
mechanical vibrations
liquid
alloy
temperature
solid metal
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German (de)
French (fr)
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Jean Pierre Gabathuler
Kurt Buxmann
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3A Composites International AG
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Alusuisse Lonza Services Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S164/00—Metal founding
    • Y10S164/90—Rheo-casting

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  • the invention relates to a method for producing a liquid-solid metal alloy phase for further processing as a material in the thixotropic state, wherein an alloy melt with a solidified portion of primary crystals is kept at a temperature between the solidus and liquidus temperature of the alloy and the primary crystals to individual degenerate dendrites or molded grains of substantially globulitic shape.
  • the inventors have set themselves the goal of creating a method of the type mentioned at the outset with which a metal alloy phase with thixotropic properties can be produced with as few oxidic inclusions as possible, low porosity and uniform casting grain size and the treatment time of the alloy pulp can be kept as short as possible. that there is no significant coarsening of the grain.
  • the process should be simple to carry out and inexpensive.
  • the vibrations which are preferably in the ultrasonic frequency range between 18 and 45 kHz, cause in addition to the desired formation of fine, globulitic cast grains of uniform grain size, homogenization and degassing of the melt in the partially solidified melt.
  • the mechanical vibrations in the alloy slurry can be generated in any way, for example via the mold by coupling a vibration generator to the mold frame.
  • the oscillations are preferably generated via the oscillation surface of at least one oscillation generator immersed directly in the molten metal, the oscillation amplitude of the oscillation surface being between 5 and 100 microns, preferably between 20 and 60 microns.
  • the mechanical vibrations can take place continuously or pulsating, the pulsing duration preferably setting the pulse duration between 20 ms and 10 s, in particular between 0.1 s and 1 s, and the ratio of the pulse duration of the mechanical vibrations to the pause duration between 0.1 and 1 lies.
  • the method according to the invention can be used both in stationary mold casting processes such as mold casting and sand casting as well as in continuous processes such as vertical and horizontal, conventional and electromagnetic continuous casting and strip casting processes of all kinds.
  • the power introduced into the melt via the mechanical vibrations is preferably 2 to 50 W / cm2 strand cross section, in particular 5 to 20 W / cm2 strand cross section.
  • the vibration area of the vibration generator (s) is preferably 1 to 100%, in particular 10 to 60%, of the strand cross-sectional area.
  • a piezoelectric vibration generator is advantageously used to generate the mechanical vibrations, since its amplitude can be set precisely regardless of its power and, moreover, larger amplitudes are possible than with magnetomechanical vibration generators.
  • liquid-solid metal alloy phase produced by the process according to the invention is first cooled below the solidus temperature of the alloy - generally to room temperature.
  • the structure with the thixotropic properties is "frozen".
  • the thixotropic state of the alloy is restored by rapid heating again to a temperature in the range between solidus and liquidus temperature of the alloy.
  • liquid-solid metal alloy phase with thixotropic properties can also be processed immediately after it has been produced, without prior solidification.
  • the heat extraction is controlled in such a way that the minimum temperature of the slurry does not drop below the solidus temperature of the alloy. Instead of a solid strand, the liquid-solid metal alloy phase is drawn off and processed directly.
  • alloy also includes the pure metals with production-related impurities, for example the different qualities of pure aluminum.
  • the method according to the invention is particularly suitable for producing thixotropic aluminum alloys. In principle, however, all castable alloy systems can be processed.
  • a vertical continuous casting plant 10 has a ring-shaped, internally cooled mold 12, the gap-shaped opening 14 of which is used to apply coolant 16 to the surface of the strand 18 emerging from the mold 12.
  • Above the mold 12 there is an attachment 20 made of refractory, heat-insulating material to form a so-called hot-top.
  • the liquid metal 22 is fed to the mold 12 via a trough 24.
  • the strand 18 is continuously lowered by means of a start-up floor 26, which keeps the mold 12 closed until the start of casting.
  • a vibration generator 28 with a vibration surface 30 dips into the liquid metal 22.
  • the mechanical vibrations transmitted from the vibration surface 30 of the vibration generator 28 to the liquid metal 22 lead in the mushy zone 32 between the liquid metal 22 and the solidified strand 18 to the formation of globular cast grains and thus to the liquid-solid metal alloy phase with thixotropic properties.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Continuous Casting (AREA)

Abstract

A molten alloy containing a solidified component consisting of primary crystals is held at a temperature between the solidus and liquidus temperature of the alloy. The primary crystals are converted into individual degenerate dendrites or cast bodies of essentially globulitic shape by generating mechanical vibrations in the frequency range between 10 and 100 kHz in this liquid-solid metal-alloy phase and thereby impart thixotropic properties to the liquid-solid metal-alloy phase.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen einer Flüssig-Fest-Metallegierungsphase für die Weiterverarbeitung als Werkstoff im thixotropen Zustand, wobei eine Legierungsschmelze mit einem erstarrten Anteil an Primärkristallen auf einer Temperatur zwischen Solidus- und Liquidustemperatur der Legierung gehalten wird und die Primärkristalle zu einzelnen degenerierten Dendriten oder Gusskörnern von im wesentlichen globulitischer Gestalt geformt werden.The invention relates to a method for producing a liquid-solid metal alloy phase for further processing as a material in the thixotropic state, wherein an alloy melt with a solidified portion of primary crystals is kept at a temperature between the solidus and liquidus temperature of the alloy and the primary crystals to individual degenerate dendrites or molded grains of substantially globulitic shape.

Bei der Herstellung von Metallegierungsphasen mit thixotropen Eigenschaften ist bekannt, die Temperatur einer Legierungsschmelze auf einen Wert zwischen Solidus- und Liquidustemperatur einzustellen und den hierbei entstehenden Legierungsbrei zur Umwandlung der beim Erstarrungsvorgang sich bildenden Dendriten zu im wesentlichen globulitischen Gusskörnern kräftig zu rühren. Dieses Verfahren sowie die Einsatzmöglichkeiten der damit erzeugten Metallegierungsphase mit thixotropen Eigenschaften ist beispielsweise in US-A-3 948 650 und US-A-3 959 651 ausführlich beschrieben. Die Rührwirkung wird auf mechanischem oder elektromagnetischem Weg erzeugt. Die DE-C-25 14 386 offenbart weiterhin ein Verfahren, bei dem eine Legierung in Knüppel- oder Stangenform auf eine Temperatur zwischen Liquidus- und Solidustemperatur erwärmt und ohne Rühren während einigen Minuten bis Stunden auf dieser Temperatur gehalten wird.In the production of metal alloy phases with thixotropic properties, it is known to set the temperature of an alloy melt to a value between solidus and liquidus temperature and to stir the resulting alloy slurry vigorously to convert the dendrites formed during the solidification process to essentially globulitic cast grains. This method and the possible uses of the metal alloy phase produced therewith with thixotropic properties is described in detail, for example, in US Pat. Nos. 3,948,650 and 3,959,651. The stirring effect is generated by mechanical or electromagnetic means. DE-C-25 14 386 further discloses a method in which an alloy in the form of a stick or rod is heated to a temperature between the liquidus and solidus temperature and is kept at this temperature for a few minutes to hours without stirring.

Die drei genannten Verfahren weisen jedoch nicht unerhebliche Nachteile auf. Sowohl beim mechanischen als auch beim elektromagnetischen Rühren besteht die Gefahr, dass einerseits auf der Schmelzeoberfläche sich ausbildende Oxidhäute und andererseits durch Wirbelbildung entstehende Luftblasen in die Schmelze eingerührt werden, was sich am Endprodukt durch unerwünschte Einschlüsse bzw. Porosität bemerkbar macht. Zudem lässt sich mit beiden Verfahren keine einheitliche Gusskorngrösse erzielen. Mit einem mechanischen Rührwerk ist überdies ein wirksames Rühren im Bereich der Erstarrungfront des Legierungsbreis aus konstruktionsbedingten Gründen nur schwer durchführbar. Die durch das Rühren bedingten Nachteile können zwar beim Verfahren nach DE-C-25 14 386 vermindert werden, jedoch tritt durch die verhältnismässig lange Haltezeit des Legierungsbreis über Solidustemperatur eine unerwünschte Kornvergröberung ein.However, the three methods mentioned have significant disadvantages. With mechanical as well as electromagnetic stirring, there is a risk that oxide skins that form on the melt surface and air bubbles that arise due to eddy formation are stirred into the melt, which is noticeable in the end product through undesirable inclusions or porosity. In addition, no uniform casting grain size can be achieved with either process. With a mechanical stirrer, moreover, effective stirring in the area of the solidification front of the alloy pulp is difficult to carry out for construction-related reasons. The disadvantages caused by stirring can be reduced in the process according to DE-C-25 14 386 However, due to the relatively long holding time of the alloy pulp above the solidus temperature, undesirable grain coarsening occurs.

Angesichts dieser Gegebenheiten haben sich die Erfinder zum Ziel gesetzt, ein Verfahren der eingangs erwähnten Art zu schaffen, mit welchem eine Metallegierungsphase mit thixotropen Eigenschaften mit möglichst wenig oxidischen Einschlüssen, geringer Porosität und einheitlicher Gusskorngrösse hergestellt und die Behandlungszeit des Legierungsbreis so kurz gehalten werden kann, dass keine wesentliche Kornvergröberung eintritt. Zudem soll das Verfahren einfach durchführbar und kostengünstig sein.In view of these circumstances, the inventors have set themselves the goal of creating a method of the type mentioned at the outset with which a metal alloy phase with thixotropic properties can be produced with as few oxidic inclusions as possible, low porosity and uniform casting grain size and the treatment time of the alloy pulp can be kept as short as possible. that there is no significant coarsening of the grain. In addition, the process should be simple to carry out and inexpensive.

Zur erfindungsgemässen Lösung der Aufgabe führt, dass in der Flüssig-Fest-Metallegierungsphase mechanische Schwingungen im Frequenzbereich zwischen 10 und 100 kHz erzeugt werden.In order to achieve the object according to the invention, mechanical vibrations in the frequency range between 10 and 100 kHz are generated in the liquid-solid metal alloy phase.

Die vorzugsweise im Ultraschallfrequenzbereich zwischen 18 und 45 kHz liegenden Schwingungen bewirken in der teilerstarrten Schmelze neben der gewünschten Ausbildung feiner, globulitischer Gusskörner von einheitlicher Korngrösse zusätzlich eine Homogenisierung und Entgasung der Schmelze.The vibrations, which are preferably in the ultrasonic frequency range between 18 and 45 kHz, cause in addition to the desired formation of fine, globulitic cast grains of uniform grain size, homogenization and degassing of the melt in the partially solidified melt.

Ein weiterer wesentlicher Vorteil des erfindungsgemässen Verfahrens wird darin gesehen, dass der durch die mechanischen Schwingungen erzeugte "Rühreffekt" praktisch bis zur vollständigen Erstarrung des Legierungsbreis aufrechterhalten bleiben kann, dies im Gegensatz zum mechanischen oder elektromagnetischen Rühren, welches infolge zunehmender Viskosität des Legierungsbreis nur bis zu einem Primärkristallanteil von etwa 65 Gew.-% im Legierungsbrei wirksam ist.Another significant advantage of the method according to the invention is seen in the fact that the "stirring effect" generated by the mechanical vibrations can be practically maintained until the alloy slurry has completely solidified, in contrast to mechanical or electromagnetic stirring, which due to increasing viscosity of the alloy slurry only up to a primary crystal content of about 65% by weight in the alloy slurry is effective.

Die mechanischen Schwingungen im Legierungsbrei können auf irgendeine Weise erzeugt werden, so beispielsweise über die Kokille durch Ankoppelung eines Schwingungserzeugers am Kokillenrahmen. Bevorzugt erfolgt jedoch die Erzeugung der Schwingungen über die Schwingungsfläche mindestens eines direkt in die Metallschmelze eintauchenden Schwingungserzeugers, wobei die Schwingungsamplitude der Schwingungsfläche zwischen 5 und 100 µm, vorzugsweise zwischen 20 und 60 µm liegt.The mechanical vibrations in the alloy slurry can be generated in any way, for example via the mold by coupling a vibration generator to the mold frame. However, the oscillations are preferably generated via the oscillation surface of at least one oscillation generator immersed directly in the molten metal, the oscillation amplitude of the oscillation surface being between 5 and 100 microns, preferably between 20 and 60 microns.

Die mechanischen Schwingungen können kontinuierlich oder pulsierend erfolgen, wobei bei pulsierender Schwingung die Pulsdauer bevorzugt zwischen 20 ms und 10 s, insbesondere zwischen 0,1 s und 1 s eingestellt wird und das Verhältnis der Pulsdauer der mechanischen Schwingungen zur Pausendauer zwischen 0,1 und 1 liegt.The mechanical vibrations can take place continuously or pulsating, the pulsing duration preferably setting the pulse duration between 20 ms and 10 s, in particular between 0.1 s and 1 s, and the ratio of the pulse duration of the mechanical vibrations to the pause duration between 0.1 and 1 lies.

Das erfindungsgemässe Verfahren ist sowohl bei stationären Kokillengiessverfahren wie Kokillen- und Sandguss als auch bei kontinuierlichen Verfahren wie vertikales und horizontales, konventionelles und elektromagnetisches Stranggiessen sowie Bandgiessverfahren aller Art anwendbar.The method according to the invention can be used both in stationary mold casting processes such as mold casting and sand casting as well as in continuous processes such as vertical and horizontal, conventional and electromagnetic continuous casting and strip casting processes of all kinds.

Beim Stranggiessen beträgt die über die mechanischen Schwingungen in die Schmelze eingebrachte Leistung bevorzugt 2 bis 50 W/cm² Strangquerschnitt, insbesondere 5 bis 20 W/cm² Strangquerschnitt. Die Schwingungsfläche der/des Schwingungserzeuger/s beträgt bevorzugt 1 bis 100%, insbesondere 10 bis 60% der Strangquerschnittsfläche.In continuous casting, the power introduced into the melt via the mechanical vibrations is preferably 2 to 50 W / cm² strand cross section, in particular 5 to 20 W / cm² strand cross section. The vibration area of the vibration generator (s) is preferably 1 to 100%, in particular 10 to 60%, of the strand cross-sectional area.

Vorteilhafterweise wird zur Erzeugung der mechanischen Schwingungen ein piezoelektrischer Schwingungserzeuger eingesetzt, da dessen Amplitude unabhängig von dessen Leistung präzis eingestellt werden kann und zudem grössere Amplituden als bei magnetomechanischen Schwingungserzeugern möglich sind.A piezoelectric vibration generator is advantageously used to generate the mechanical vibrations, since its amplitude can be set precisely regardless of its power and, moreover, larger amplitudes are possible than with magnetomechanical vibration generators.

Während bei kontinuierlichen Giessverfahren die mechanischen Schwingungen naturgemäss während des gesamten Erstarrungsvorganges von der Schmelze über den Legierungsbrei bis hin zur vollständigen Erstarrung auf das Metall einwirken, genügt es bei stationären Giessverfahren, die mechanischen Schwingungen kurz vor dem Erstarrungsbeginn in die Schmelze einzuleiten. Zur Erzielung eines optimalen thixotropen Gefüges werden die Schwingungen üblicherweise bis kurz vor Eintritt der vollständigen Erstarrung der Schmelze aufrechterhalten.While with continuous casting processes the mechanical vibrations naturally act on the metal during the entire solidification process from the melt to the alloy slurry up to complete solidification, with stationary casting processes it is sufficient to introduce the mechanical vibrations into the melt shortly before the start of solidification. In order to achieve an optimal thixotropic structure, the vibrations are usually maintained until shortly before the melt solidifies completely.

Im allgemeinen wird die mit dem erfindungsgemässen Verfahren hergestellte Flüssig-Fest-Metallegierungsphase zunächst unter die Solidustemperatur der Legierung -- im allgemeinen auf Raumtemperatur -- abgekühlt.In general, the liquid-solid metal alloy phase produced by the process according to the invention is first cooled below the solidus temperature of the alloy - generally to room temperature.

Hierbei wird die Struktur mit den thixotropen Eigenschaften "eingefroren". Zur Weiterverarbeitung des Materials in einer Druckgiessmaschine oder durch andere Warmumformungsverfahren wie Schmieden oder Pressen wird der thixotrope Zustand der Legierung durch erneutes rasches Aufheizen auf eine Temperatur im Bereich zwischen Solidus- und Liquidustemperatur der Legierung wieder hergestellt.Here, the structure with the thixotropic properties is "frozen". For further processing of the material in a die casting machine or by other hot forming processes such as forging or pressing, the thixotropic state of the alloy is restored by rapid heating again to a temperature in the range between solidus and liquidus temperature of the alloy.

Selbstverständlich kann die Flüssig-Fest-Metallegierungsphase mit thixotropen Eigenschaften auch unmittelbar nach deren Erzeugung ohne vorherige vollständige Verfestigung weiterverarbeitet werden. Bei Anwendung kontinuierlicher Giessverfahren wird in diesem Fall der Wärmeentzug derart gesteuert, dass die minimale Temperatur des Breis nicht unter die Solidustemperatur der Legierung absinkt. Anstelle eines festen Stranges wird die Flüssig-Fest-Metallegierungsphase abgezogen und direkt weiterverarbeitet.Of course, the liquid-solid metal alloy phase with thixotropic properties can also be processed immediately after it has been produced, without prior solidification. When using continuous casting processes, the heat extraction is controlled in such a way that the minimum temperature of the slurry does not drop below the solidus temperature of the alloy. Instead of a solid strand, the liquid-solid metal alloy phase is drawn off and processed directly.

Es sei hier noch angemerkt, dass unter dem Begriff Legierung auch die Reinmetalle mit herstellungsbedingten Verunreinigungen verstanden werden, also beispielsweise die verschiedenen Qualitäten von Reinaluminium.It should also be noted here that the term alloy also includes the pure metals with production-related impurities, for example the different qualities of pure aluminum.

Das erfindungsgemässe Verfahren ist besonders geeignet zum Herstellen thixotroper Aluminiumlegierungen. Grundsätzlich können jedoch alle vergiessbaren Legierungssysteme verarbeitet werden.The method according to the invention is particularly suitable for producing thixotropic aluminum alloys. In principle, however, all castable alloy systems can be processed.

Orientierende Versuche an einer Legierung des Typs AlSi7Mg haben gezeigt, dass die Ultraschallbehandlung der Flüssig-Fest-Phase nicht nur zu globulitischen Gusskörnern einheitlicher Korngrösse führt, sondern gleichzeitig eine Kornfeinung beobachtet werden kann. Wird ein thixotropes Gefüge mit noch kleinerer Gusskorngrösse gewünscht, so kann der Schmelze zusätzlich ein Kornfeinungsmittel bekannter Art wie beispielsweise Titanborid zugegeben werden. Die Versuchsergebnisse sind in nachstehender Tabelle zusammengestellt.

Figure imgb0001
Orientative tests on an AlSi7Mg alloy have shown that the ultrasound treatment of the liquid-solid phase not only leads to globulitic cast grains of uniform grain size, but that grain refinement can also be observed. If a thixotropic structure with an even smaller casting grain size is desired, a grain refining agent of a known type, such as titanium boride, can also be added to the melt. The test results are summarized in the table below.
Figure imgb0001

Tabelle: mittlerer Gusskorndurchmesser in AlSi7MgTable: average casting grain diameter in AlSi7Mg

Das erfindungsgemässe Verfahren wird nachstehend anhand eines in der Figur schematisch dargestellten Ausführungsbeispieles näher erläutert.The method according to the invention is explained in more detail below on the basis of an exemplary embodiment shown schematically in the figure.

Eine vertikale Stranggiessanlage 10 weist eine ringförmig angeordnete, innengekühlte Kokille 12 auf, deren spaltförmige Oeffnung 14 zum Aufbringen von Kühlmittel 16 auf die Oberfläche des aus der Kokille 12 austretenden Stranges 18 dient. Oberhalb der Kokille 12 ist ein Aufsatz 20 aus feuerfesten, wärmeisolierendem Werkstoff zur Bildung eines sogenannten Hot-Top angeordnet. Das flüssige Metall 22 wird der Kokille 12 über eine Giessrinne 24 zugeführt. Der Strang 18 wird mittels eines Anfahrbodens 26, der die Kokille 12 bis zum Giessstart geschlossen hält, kontinuierlich abgesenkt.A vertical continuous casting plant 10 has a ring-shaped, internally cooled mold 12, the gap-shaped opening 14 of which is used to apply coolant 16 to the surface of the strand 18 emerging from the mold 12. Above the mold 12 there is an attachment 20 made of refractory, heat-insulating material to form a so-called hot-top. The liquid metal 22 is fed to the mold 12 via a trough 24. The strand 18 is continuously lowered by means of a start-up floor 26, which keeps the mold 12 closed until the start of casting.

Ueber der Kokille taucht ein Schwingungserzeuger 28 mit Schwingungsfläche 30 in das flüssige Metall 22 ein. Die von der Schwingungsfläche 30 des Schwingungserzeugers 28 auf das flüssige Metall 22 übertragenen mechanischen Schwingungen führen in der breiigen Zone 32 zwischen dem flüssigen Metall 22 und dem erstarrten Strang 18 zur Ausbildung globulitischer Gusskörner und damit zur Flüssig-Fest-Metallegierungsphase mit thixotropen Eigenschaften.Above the mold, a vibration generator 28 with a vibration surface 30 dips into the liquid metal 22. The mechanical vibrations transmitted from the vibration surface 30 of the vibration generator 28 to the liquid metal 22 lead in the mushy zone 32 between the liquid metal 22 and the solidified strand 18 to the formation of globular cast grains and thus to the liquid-solid metal alloy phase with thixotropic properties.

Claims (10)

Verfahren zum Herstellen einer Flüssig-Fest-Metallegierungsphase im für die Weiterverarbeitung als Werkstoff thixotropen Zustand, wobei eine Legierungsschmelze mit einem erstarrten Anteil an Primärkristallen auf einer Temperatur zwischen Solidus- und Liquidustemperatur der Legierung gehalten wird und die Primärkristalle zu einzelnen degenerierten Dendriten oder Gusskörnern von im wesentlichen globulitischer Gestalt geformt werden,
dadurch gekennzeichnet,
dass in der Flüssig-Fest-Metallegierungsphase mechanische Schwingungen im Frequenzbereich zwischen 10 und 100 kHz erzeugt werden.Process for producing a liquid-solid metal alloy phase in the thixotropic state for further processing as a material, wherein an alloy melt with a solidified proportion of primary crystals is kept at a temperature between the solidus and liquidus temperature of the alloy and the primary crystals form individual degenerate dendrites or cast grains essential globular shape,
characterized,
that mechanical vibrations in the frequency range between 10 and 100 kHz are generated in the liquid-solid metal alloy phase. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Frequenz der mechanischen Schwingungen im Ultraschallbereich zwischen 18 und 45 kHz liegt.A method according to claim 1, characterized in that the frequency of the mechanical vibrations in the ultrasonic range is between 18 and 45 kHz. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Erzeugung der mechanischen Schwingungen über die Schwingungsfläche mindestens eines direkt in die Metallschmelze eintauchenden Schwingungserzeugers erfolgt.A method according to claim 1 or 2, characterized in that the mechanical vibrations are generated via the vibration surface of at least one vibration generator immersed directly in the molten metal. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Schwingungsamplitude der Schwingungsfläche zwischen 5 und 100 µm, vorzugsweise zwischen 20 und 60 µm liegt.Method according to claim 3, characterized in that the oscillation amplitude of the oscillation surface is between 5 and 100 µm, preferably between 20 and 60 µm. Verfahren nach wenigstens einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die mechanischen Schwingungen pulsierend erfolgen.Method according to at least one of claims 1 to 4, characterized in that the mechanical vibrations take place in a pulsating manner. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass das Verhält nis der Pulsdauer der mechanischen Schwingungen zur Pausendauer zwischen 0,1 und 1 liegt.A method according to claim 5, characterized in that the ratio of the pulse duration of the mechanical vibrations to the pause duration is between 0.1 and 1. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Pulsdauer zwischen 20 ms und 10 s, vorzugsweise zwischen 0,1 s und 1 s eingestellt wird.A method according to claim 5 or 6, characterized in that the Pulse duration between 20 ms and 10 s, preferably between 0.1 s and 1 s is set. Verfahren nach wenigstens einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass beim kontinuierlichen Stranggiessen die über die mechanischen Schwingungen in die Metallschmelze eingebrachte Leistung 2 bis 50 W/cm² Strangquerschnitt, vorzugsweise 5 bis 20 W/cm² Strangquerschnitt beträgt.Method according to at least one of claims 1 to 7, characterized in that in continuous casting, the power introduced into the molten metal via the mechanical vibrations is 2 to 50 W / cm² strand cross section, preferably 5 to 20 W / cm² strand cross section. Verfahren nach Anspruch 3 und 8, dadurch gekennzeichnet, dass die Schwingungsfläche der/des Schwingungserzeuger/s 1 bis 100%, vorzugsweise 10 bis 60% der Strangquerschnittsfläche beträgt.A method according to claims 3 and 8, characterized in that the vibration area of the / the vibration generator / s is 1 to 100%, preferably 10 to 60% of the strand cross-sectional area. Verfahren nach wenigstens einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Erzeugung der mechanischen Schwingungen mit einem piezoelektrischen Schwingungserzeuger erfolgt.Method according to at least one of claims 1 to 9, characterized in that the mechanical vibrations are generated with a piezoelectric vibration generator.
EP91810961A 1990-12-21 1991-12-11 Process for manufacturing a liquid-solid metallic material, suitable for further working up in thixotropic state Withdrawn EP0493318A1 (en)

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CH4090/90A CH682402A5 (en) 1990-12-21 1990-12-21 A method for producing a liquid-solid metal alloy phase having thixotropic properties.

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0575796A1 (en) * 1992-06-10 1993-12-29 NORSK HYDRO a.s. Method for production of thixotropic magnesium alloys
WO2000044944A2 (en) * 1998-06-10 2000-08-03 Suraltech, Inc. Processes for continuously producing fine grained metal compositions and for semi-solid forming of shaped articles
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WO2000044944A2 (en) * 1998-06-10 2000-08-03 Suraltech, Inc. Processes for continuously producing fine grained metal compositions and for semi-solid forming of shaped articles
WO2000044944A3 (en) * 1998-06-10 2000-11-16 Suraltech Inc Processes for continuously producing fine grained metal compositions and for semi-solid forming of shaped articles
WO2006035133A1 (en) * 2004-09-24 2006-04-06 Alcan Rhenalu High-strength aluminium alloy products and method for the production thereof
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