EP1344589A2 - Process and device for treating an alloy melt before a casting operation - Google Patents
Process and device for treating an alloy melt before a casting operation Download PDFInfo
- Publication number
- EP1344589A2 EP1344589A2 EP03003899A EP03003899A EP1344589A2 EP 1344589 A2 EP1344589 A2 EP 1344589A2 EP 03003899 A EP03003899 A EP 03003899A EP 03003899 A EP03003899 A EP 03003899A EP 1344589 A2 EP1344589 A2 EP 1344589A2
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- melt
- crystallization
- alloy
- container
- crystallization container
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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
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/007—Semi-solid pressure die casting
-
- 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
Definitions
- the invention relates to a method and a device for processing a melt of an alloy for a casting process, which in a partially solidified state is brought and crystallization nuclei distributed over their volume contains.
- the invention has for its object a melt of an alloy to prepare in such a way that the distribution is as fine and homogeneous as possible the nuclei are present over the volume of the melt, before it is placed in a mold.
- melt that is above has the melting temperature of the alloy, in a temperature below the melting temperature heated crystallization tank that brought this melt alloy is added as a powder in the crystallization container and that by means of electrical and / or magnetic forces melt and Powder are mixed together in the crystallization container.
- the powdery particles of the alloy which by the Melt immediately enveloped, form crystallization nuclei, which means of the electrical and / or magnetic forces within the melt be distributed homogeneously.
- the Melt is introduced as a jet into the crystallization tank extends between two electrodes to which an electrical voltage is created. Due to the so-called pinch effect, the Beam narrowed and compressed during the inflow is already partially broken down into individual, liquid drops.
- the crystallization tank is not filled with a compact jet, but with a dispersed jet. This increases the area of the melt volume clearly, with degassing also taking place.
- a magnetic field is formed in the crystallization container.
- the magnetic field and the electric field act on the melt and the particles in it differ, so that the mixing effect is promoted.
- the The melt is sucked into the crystallization vessel, which is pressurized becomes.
- the incoming jet is out
- the melt continues to disperse and dissolve into individual drops. Also this promotes the formation of crystallization nuclei.
- the melt is fed to the crystallization container with the supply of protective gas.
- the process is further improved, especially if the protective gas is supplied under pressure.
- the protective gas prevents chemical reactions of the alloy with the atmosphere, which could adversely affect the subsequent casting process.
- a crystallization container with an inlet for the melt and an inlet for alloy in powder form is provided, which has a heating device and which is provided in the region of its base and its inlet with electrodes applied to a voltage source.
- a furnace 10 In a furnace 10 is a melt 11 of a metal alloy, for example AlSi 9, kept at a temperature above the Melting temperature of this alloy is.
- the oven 10 is vacuum tight closed and kept under vacuum by means of a suction device 12.
- the furnace 10 is connected to a crystallization container via a pouring line 13 14 connected.
- the crystallization container 14 consists of a cylinder 15 made of electrically non-conductive material that has a thermal conductivity between 0.20 and 1.5W / mk.
- the cylinder 15 is at the top closed a lid 16, which is also made of electrically non-conductive Material exists.
- the line 13 connects to the cover.
- the lid with an inlet piece 17 made of electrically conductive material connected.
- the inlet piece 17 has a conically widening Inlet opening.
- a suction line 18 connects to the cover 16, which is connected to a suction 19.
- the lid 16 is also with a filler neck 20 through which alloy in Powder form can be entered into the crystallization container 14.
- a piston 21, which also serves as the base of the crystallization container 14 consists of an electrically non-conductive material.
- the piston 21 is in an adjoining the crystallization container 14 Cylinder 22 guided, which is provided with a drain opening, not shown is.
- the cylinder 15 of the crystallization container 14 is in the area its bottom provided with an electrode 23.
- the inlet piece 17 is made of electrically conductive material. Between the electrode 23 and the inlet piece 17 is a voltage source 24 arranged, their tension and especially theirs Amperage is adjustable by means of an adjusting device 25.
- the crystallization container 14 is a preferably electrical heating device 26 assigned, which is preferably adjustable and which Crystallization container 14 heated to a preselectable temperature and keeps at that temperature. Furthermore, the crystallization tank 14 assigned a solenoid 27 with which inside the Cylinder 15 of the crystallization container 14 builds up a magnetic field is.
- the pouring channel 13 is equipped with a gate valve 28, via which the connection between the furnace 19 and the crystallization tank 14 can be released and locked.
- a feed line 29 via which protective gas Overpressure can be supplied, for example argon.
- melt 11 is first placed in the furnace 10 filled.
- the oven 10 is turned on by means of the suction 12 Vacuum brought from 0.5mbar to 3mbar.
- the crystallization tank 14 is heated to a temperature by means of the heating device 26, which 3% to 50% lower than the melting temperature of the alloy in question is.
- suction 19 creates a vacuum that is stronger than the vacuum in the furnace 10th
- the melt 11 is placed in the crystallization container 14 sucked in.
- protective gas is supplied via the line 29 fed. Due to the suction effect, alloy is also in powder form sucked in via the inlet connection 20. The powder is in the Melt enclosed and distributed.
- a voltage is applied to the electrode 23 and the inlet piece 17, so that a current flows in the beam of the melt, the size of which is less than 10A.
- a mixture to be as homogeneously dispersed as possible is obtained by means of the magnetic coil 27 inside the crystallization container 14 generates a magnetic field that leads to a radial Movement of the melt leads.
- the voltage source 24 is on two electrodes 30 and 31 of the cylinder 15 of the crystallization container 14 connected.
- the second connection is made to the pouring channel 13.
- the piston 21 moves during filling the melt continuously down, then one after the other the electrodes 30 and 31 are used, which with the piston movement can be switched on and off via switches 32 and 33.
- a storage or transport container 34 passed on, in which they are in the processed state is held.
- This container 34 is provided with a suction 35 so that a vacuum can be applied to it. He is with a heater 36 and a solenoid 37. As well it is equipped with an electrode 38.
- the two end walls of the Container 34 are formed by pistons 39 and 40.
- the container 34 can also be used for shaping.
- the thermokinetic sequence can be predicted with the nomogram shown in FIG. 4.
- the nomogram shown applies to the AlSi9Cu 3 alloy.
- the amount of powdery alloy that is added with a grain size of about 125 microns to about 400 microns is applied in percentages.
- the temperature difference ⁇ T in [C °] is the difference between the casting temperature and the melting temperature of the alloy. If an amount of powdery alloy is added which lies in the nomogram area A, this only brings about a reduction in the temperature of the melt. The melt is thus brought into a semi-solid state without the powdery particles forming nuclei. However, if an amount of powdery alloy is added so that the nomogram area B is reached, the powdery particles act as additional unmelted nuclei. If powdery particles are added in the nomogram area C, the two processes will take place side by side, ie a reduction in the overheating temperature and nucleation due to unmelted particles.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Details (AREA)
- General Induction Heating (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Joining Of Building Structures In Genera (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Aufbereiten einer Schmelze einer Legierung für einen Gießvorgang, die in einen teilerstarrten Zustand gebracht wird und über ihr Volumen verteilte Kristallisationskeime enthält.The invention relates to a method and a device for processing a melt of an alloy for a casting process, which in a partially solidified state is brought and crystallization nuclei distributed over their volume contains.
Das Herstellen von halberstarrter Legierungen ist beispielsweise aus einem Beitrag von J.-P. Gabathuler und J. Erling "Thixocasting: ein moderndes Verfahren zur Herstellung von Formbauteilen" bekannt, der in dem Tagungsband "Aluminium als Leichtbaustoff in Transport und Verkehr", ETH Zürich, S. 63 bis 77 vom 27.05.1994 bekannt.The manufacture of semi-rigid alloys is, for example, from a contribution by J.-P. Gabathuler and J. Erling "Thixocasting: a modern Process for the production of molded components "known in the conference volume "Aluminum as a lightweight building material in transport and traffic", ETH Zurich, pp. 63 to 77 from May 27, 1994.
Der Erfindung liegt die Aufgabe zugrunde, eine Schmelze einer Legierung so aufzubereiten, dass eine möglichst feine und homogene Verteilung der Kristallisationskeime über das Volumen der Schmelze vorliegt, bevor diese in eine Gießform eingebracht wird.The invention has for its object a melt of an alloy to prepare in such a way that the distribution is as fine and homogeneous as possible the nuclei are present over the volume of the melt, before it is placed in a mold.
Diese Aufgabe wird dadurch gelöst, dass Schmelze, die eine oberhalb der Schmelztemperatur der Legierung liegende Temperatur aufweist, in einen auf eine unterhalb der Schmelztemperatur liegende Temperatur beheizten Kristallisationsbehälter gebracht wird, dass dieser Schmelze in dem Kristallisationsbehälter Legierung als Pulver zugegeben wird und dass mittels elektrischer und/oder magnetischer Kräfte Schmelze und Pulver in dem Kristallisationsbehälter miteinander vermischt werden.This problem is solved in that melt that is above has the melting temperature of the alloy, in a temperature below the melting temperature heated crystallization tank that brought this melt alloy is added as a powder in the crystallization container and that by means of electrical and / or magnetic forces melt and Powder are mixed together in the crystallization container.
Insbesondere die pulverförmigen Partikel der Legierung, die von der Schmelze sofort umhüllt werden, bilden Kristallisationskeime, die mittels der elektrischen und/oder magnetischen Kräfte innerhalb der Schmelze homogen verteilt werden.In particular, the powdery particles of the alloy, which by the Melt immediately enveloped, form crystallization nuclei, which means of the electrical and / or magnetic forces within the melt be distributed homogeneously.
In vorteilhafter Ausgestaltung der Erfindung wird vorgesehen, dass die Schmelze als Strahl in den Kristallisationsbehälter eingebracht wird, der sich zwischen zwei Elektroden erstreckt, an die eine elektrische Spannung angelegt wird. Aufgrund des sogenannten Pinch-Effektes wird der Strahl verengt und zusammengepresst, der während des Einströmens schon teilweise in einzelne, flüssige Tropfen aufgespalten wird. Der Kristallisationsbehälter wird somit nicht mit einem kompakten Strahl gefüllt, sondern mit einem dispergierten Strahl. Damit erhöht sich die Fläche des Schmelzenvolumens deutlich, wobei auch eine Entgasung stattfindet.In an advantageous embodiment of the invention it is provided that the Melt is introduced as a jet into the crystallization tank extends between two electrodes to which an electrical voltage is created. Due to the so-called pinch effect, the Beam narrowed and compressed during the inflow is already partially broken down into individual, liquid drops. The crystallization tank is not filled with a compact jet, but with a dispersed jet. This increases the area of the melt volume clearly, with degassing also taking place.
Wenn die Schmelze vollständig in den Kristallisationsbehälter eingeströmt ist, verschwindet der Schmelzenstrahl, so dass dann auch der Stromfluss unterbrochen wird. Um weiter eine Dispergierung zu erreichen und auch ein elektrisches Feld zu erzeugen, wird dann in weiterer Ausgestaltung der Erfindung vorgesehen, dass nach Einbringen der Schmelze zwischen der Schmelze und einer Elektrode ein Lichtbogen gezündet wird.When the melt completely flows into the crystallization tank the melt jet disappears, so that then the Current flow is interrupted. To further achieve dispersion and also to generate an electric field is then used in another Embodiment of the invention provided that after the An arc melts between the melt and an electrode is ignited.
Um weiter das Durchmischen der in dem Kristallisationsbehälter befindlichen Schmelze zu fördern und dabei die Kristallisationskeime fein zu verteilen, wird in dem Kristallisationsbehälter ein Magnetfeld gebildet. Das Magnetfeld und das elektrische Feld wirken auf die Schmelze und die darin befindlichen Partikel unterschiedlich ein, so dass der Vermischungseffekt gefördert wird.To continue mixing the ones in the crystallization tank To promote melt and the crystallization nuclei to fine distribute, a magnetic field is formed in the crystallization container. The magnetic field and the electric field act on the melt and the particles in it differ, so that the mixing effect is promoted.
In weiterer Ausgestaltung der Erfindung wird vorgesehen, dass die Schmelze in den unter Unterdruck gesetzten Kristallisationsbehälter eingesaugt wird. Durch die Erzeugung eines Vakuums in dem Kristallisationsbehälter wird weiter erreicht, dass der einströmende Strahl aus Schmelze weiter dispergiert und sich in einzelne Tropfen auflöst. Auch damit wird die Bildung von Kristallisationskeimen gefördert.In a further embodiment of the invention it is provided that the The melt is sucked into the crystallization vessel, which is pressurized becomes. By creating a vacuum in the crystallization tank it is further achieved that the incoming jet is out The melt continues to disperse and dissolve into individual drops. Also this promotes the formation of crystallization nuclei.
In weiterer Ausgestaltung der Erfindung wird vorgesehen, dass die
Schmelze unter Zufuhr von Schutzgas dem Kristallisationsbehälter
zugeführt wird. Insbesondere wenn das Schutzgas unter Druck
zugeführt wird, wird der Prozess weiter verbessert. Darüber hinaus
verhindert das Schutzgas chemische Reaktionen der Legierung mit der
Atmosphäre, was den anschließenden Gießvorgang nachteilig
beeinflussen könnte.
Bei einer Vorrichtung zum Durchführen des Verfahrens wird ein Kristallisationsbehälter
mit einem Einlass für die Schmelze und einem Einlass
für Legierung in Pulverform vorgesehen, der eine Heizeinrichtung aufweist
und der im Bereich seines Bodens und seines Einlasses mit an
eine Spannungsquelle angelegten Elektroden versehen ist.In a further embodiment of the invention, it is provided that the melt is fed to the crystallization container with the supply of protective gas. The process is further improved, especially if the protective gas is supplied under pressure. In addition, the protective gas prevents chemical reactions of the alloy with the atmosphere, which could adversely affect the subsequent casting process.
In a device for carrying out the method, a crystallization container with an inlet for the melt and an inlet for alloy in powder form is provided, which has a heating device and which is provided in the region of its base and its inlet with electrodes applied to a voltage source.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der in der Zeichnung dargestellten Ausführungsformen.
- Fig. 1
- zeigt eine erfindungsgemäße Vorrichtung im Schnitt in schematischer Darstellung, die direkt an einen Ofen angeschlossen ist,
- Fig. 2
- eine abgewandelte Ausführungsform einer erfindungsgemäßen Vorrichtung,
- Fig. 3
- eine erfindungsgemäße Vorrichtung mit einer Zusatzeinrichtung zur Übernahme der aufbereiteten Schmelze und
- Fig. 4
- ein Nomogramm zur Voraussage des thermokinetischen Ablaufs.
- Fig. 1
- shows a device according to the invention in section in a schematic representation, which is connected directly to an oven,
- Fig. 2
- a modified embodiment of a device according to the invention,
- Fig. 3
- a device according to the invention with an additional device for taking over the processed melt and
- Fig. 4
- a nomogram to predict the thermokinetic process.
In einem Ofen 10 wird eine Schmelze 11 einer Metalllegierung, beispielsweise
AlSi 9, auf einer Temperatur gehalten, die oberhalb der
Schmelztemperatur dieser Legierung liegt. Der Ofen 10 ist vakuumdicht
verschlossen und mittels einer Absaugung 12 unter Vakuum gehalten.In a
Der Ofen 10 ist über eine Gießleitung 13 mit einem Kristallisationsbehälter
14 verbunden. Der Kristallisationsbehälter 14 besteht aus einem Zylinder
15 aus elektrisch nicht leitendem Material, das eine Wärmeleitfähigkeit
zwischen 0,20 und 1,5W/mk besitzt. Der Zylinder 15 ist oben mit
einem Deckel 16 verschlossen, der ebenfalls aus elektrisch nicht leitendem
Material besteht. An den Deckel schließt die Leitung 13 an. Hierzu
ist der Deckel mit einem Einlassstück 17 aus elektrisch leitendem Material
verbunden. Das Einlassstück 17 besitzt eine sich konisch erweiternde
Einlassöffnung. An den Deckel 16 schließt eine Absaugleitung 18 an,
die mit einer Absaugung 19 verbunden ist. Der Deckel 16 ist weiter mit
einem Einfüllstutzen 20 versehen, durch welchen hindurch Legierung in
Pulverform in den Kristallisationsbehälter 14 eingegeben werden kann.The
Als Boden des Kristallisationsbehälters 14 dient ein Kolben 21, der ebenfalls
aus einem elektrisch nicht leitenden Material besteht. Der Kolben
21 ist in einem an den Kristallisationsbehälter 14 anschließenden
Zylinder 22 geführt, der mit einer nicht dargestellten Abflussöffnung versehen
ist. Der Zylinder 15 des Kristallisationsbehälters 14 ist im Bereich
seines Bodens mit einer Elektrode 23 versehen. Wie schon erwähnt
wurde, ist das Einlassstück 17 aus elektrisch leitendem Material. Zwischen
der Elektrode 23 und dem Einlassstück 17 ist eine Spannungsquelle
24 angeordnet, deren Spannung und vor allem auch deren
Stromstärke mittels einer Verstelleinrichtung 25 einstellbar ist. A
Dem Kristallisationsbehälter 14 ist eine vorzugsweise elektrische Heizeinrichtung
26 zugeordnet, die vorzugsweise regelbar ist und die den
Kristallisationsbehälter 14 auf einer vorwählbare Temperatur aufheizt
und auf dieser Temperatur hält. Des weiteren ist dem Kristallisationsbehälter
14 eine Magnetspule 27 zugeordnet, mit welcher im Innern des
Zylinders 15 des Kristallisationsbehälters 14 ein Magnetfeld aufbaubar
ist.The
Der Gießkanal 13 ist mit einem Absperrschieber 28 ausgerüstet, über
welchen die Verbindung zwischen dem Ofen 19 und dem Kristallisationsbehälter
14 freigegeben und abgesperrt werden kann. An den Gießkanal
13 schließt eine Zuführleitung 29 an, über welche Schutzgas mit
Überdruck zugeführt werden kann, beispielsweise Argon.The
Zum Aufbereiten einer Schmelze wird zunächst Schmelze 11 in den Ofen
10 eingefüllt. Der Ofen 10 wird mittels der Absaugung 12 auf ein
Vakuum von 0,5mbar bis 3mbar gebracht. Der Kristallisationsbehälter 14
wird mittels der Heizeinrichtung 26 auf eine Temperatur aufgeheizt, die
3% bis 50% niedriger als die Schmelztemperatur der betreffenden Legierung
ist. In dem Kristallisationsbehälter 14 wird mittels der Absaugung
19 ein Vakuum erzeugt, das stärker ist als das Vakuum in dem Ofen
10.To prepare a melt,
Sobald der Schieber 28 geöffnet wird, wird Schmelze 11 in den Kristallisationsbehälter
14 eingesaugt. Dabei wird Schutzgas über die Leitung
29 zugeführt. Aufgrund der Saugwirkung wird auch Legierung in Pulverform
über den Einlassstutzen 20 angesaugt. Das Pulver wird in die
Schmelze eingeschlossen und verteilt.As soon as the
An die Elektrode 23 und das Einlassstück 17 wird eine Spannung angelegt,
so dass in dem Strahl der Schmelze ein Strom fließt, dessen Größe
weniger als 10A beträgt. Um ein möglichst homogen dispergiertes Gemisch
zu erhalten, wird mittels der Magnetspule 27 im Innern des Kristallisationsbehälters
14 ein Magnetfeld erzeugt, das zu einer radialen
Bewegung der Schmelze führt.A voltage is applied to the
Nachdem die gesamte Schmelze in den Kristallisationsbehälter eingeströmt
ist, ist zunächst der Stromkreis unterbrochen. Jetzt wird die
Spannung auf Werte von 150V bis 400V erhöht, so dass ein Lichtbogen
gezündet wird, in welchem ein Strom mit einer Stärke bis zu 1300A strömen
kann. Um eine gerichtete Kristallisation zu vermeiden, wird das
elektromagnetische Feld, das mit der Magnetspule 27 erzeugt wird, variiert
und beispielsweise in Richtung der Füllung kontinuierlich erhöht.After all of the melt has flowed into the crystallization tank
the circuit is initially interrupted. Now that is
Voltage increased to values from 150V to 400V, causing an arc
is ignited, in which a current with a strength of up to 1300 A flows
can. To avoid directional crystallization, this is
electromagnetic field generated with the
Nachdem die Schmelze in dieser Weise aufbereitet worden ist, wird der
Kolben 21 abgesenkt, so dass die Schmelze über den Zylinder und dessen
Abflussöffnung ausfließt und in geeigneter Weise weiter verarbeitet
wird. Dabei können alle bekannten Gussverfahren angewandt werden.After the melt has been processed in this way, the
Bei einer abgewandelten Ausführungsform wird vorgesehen, dass die
Elektrode 23 in den Kolben 21 integriert ist, der den Boden des Kristallisationsbehälters
14 bildet.In a modified embodiment it is provided that the
Bei dem Ausführungsbeispiel nach Fig. 2 ist die Spannungsquelle 24 an
zwei Elektroden 30 und 31 des Zylinders 15 des Kristallisationsbehälters
14 angeschlossen. Der zweite Anschluss erfolgt an den Gießkanal 13.
Bei dieser Ausführung bewegt sich der Kolben 21 während des Einfüllens
der Schmelze kontinuierlich nach unten, wobei dann nacheinander
die Elektroden 30 und 31 zum Einsatz kommen, die mit der Kolbenbewegung
über Schalter 32 und 33 zu- und abgeschaltet werden.2, the
Bei dem Ausführungsbeispiel nach Fig. 3 wird die in den Kristallisationsbehälter
14 aufbereitete Schmelze in einen Aufbewahrungs- oder Transportbehälter
34 weitergegeben, in welchem sie in dem aufbereiteten Zustand
gehalten wird. Dieser Behälter 34 ist mit einer Absaugung 35 versehen,
so dass an ihn ein Unterdruck angelegt werden kann. Er ist mit
einer Heizeinrichtung 36 und einer Magnetspule 37 versehen. Ebenso
ist er mit einer Elektrode 38 ausgerüstet. Die beiden Stirnwände des
Behälters 34 werden von Kolben 39 und 40 gebildet. Der Behälter 34
kann auch zur Formgebung eingesetzt werden.In the embodiment according to FIG. 3, it is placed in the
Mit dem in Fig. 4 dargestellten Nomogramm lässt sich der thermokinetische Ablauf voraussagen. Das dargestellte Nomogramm gilt für die Legierung AlSi9Cu3. Die Menge an pulverförmiger Legierung, die mit einer Korngröße von etwa 125µm bis etwa 400µm zugegeben wird, ist in Mengenprozentanteilen aufgetragen. Die Temperaturdifferenz ΔT in [C°] ist der Unterschied zwischen der Gießtemperatur und der Schmelztemperatur der Legierung. Wenn eine Menge an pulverförmiger Legierung zugegeben wird, die in dem Nomogrammbereich A liegt, so bewirkt diese nur eine Reduzierung der Temperatur der Schmelze. Die Schmelze wird damit in einem halberstarrten Zustand versetzt, ohne dass die pulverförmigen Partikel Kristallisationskeime bilden. Wenn jedoch eine Menge an pulverförmiger Legierung zugegeben wird, so dass der Nomogrammbereich B erreicht wird, so wirken die pulverförmigen Partikel als zusätzliche, nicht geschmolzene Kristallisationskeime. Erfolgt die Zugabe von pulverförmigen Partikeln in dem Nomogrammbereich C, so werden die beiden Vorgänge nebeneinander ablaufen, d.h. eine Verringerung der Überhitzungstemperatur und eine Keimbildung aufgrund nicht geschmolzener Partikel.The thermokinetic sequence can be predicted with the nomogram shown in FIG. 4. The nomogram shown applies to the AlSi9Cu 3 alloy. The amount of powdery alloy that is added with a grain size of about 125 microns to about 400 microns is applied in percentages. The temperature difference ΔT in [C °] is the difference between the casting temperature and the melting temperature of the alloy. If an amount of powdery alloy is added which lies in the nomogram area A, this only brings about a reduction in the temperature of the melt. The melt is thus brought into a semi-solid state without the powdery particles forming nuclei. However, if an amount of powdery alloy is added so that the nomogram area B is reached, the powdery particles act as additional unmelted nuclei. If powdery particles are added in the nomogram area C, the two processes will take place side by side, ie a reduction in the overheating temperature and nucleation due to unmelted particles.
Selbstverständlich müssen unterschiedliche Nomogramme für unterschiedliche Legierungen gebildet werden.Of course, different nomograms have to be made for different ones Alloys are formed.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI200331339T SI1344589T1 (en) | 2002-03-13 | 2003-02-21 | Process and device for treating an alloy melt before a casting operation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10212349 | 2002-03-13 | ||
DE10212349A DE10212349C1 (en) | 2002-03-13 | 2002-03-13 | Production of an alloy melt for casting comprises placing the melt having a temperature lying above the liquidus temperature of the alloy in a crystallization vessel, adding an alloy as a powder, and mixing the melt and powder |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1344589A2 true EP1344589A2 (en) | 2003-09-17 |
EP1344589A3 EP1344589A3 (en) | 2005-05-18 |
EP1344589B1 EP1344589B1 (en) | 2008-06-04 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP03003899A Expired - Lifetime EP1344589B1 (en) | 2002-03-13 | 2003-02-21 | Process and device for treating an alloy melt before a casting operation |
Country Status (16)
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---|---|
US (1) | US6988529B2 (en) |
EP (1) | EP1344589B1 (en) |
JP (1) | JP4541650B2 (en) |
KR (1) | KR100995490B1 (en) |
CN (1) | CN1275725C (en) |
AT (1) | ATE397503T1 (en) |
AU (1) | AU2003200990B2 (en) |
BR (1) | BR0300491B1 (en) |
CA (1) | CA2420931C (en) |
DE (2) | DE10212349C1 (en) |
DK (1) | DK1344589T3 (en) |
ES (1) | ES2307838T3 (en) |
MX (1) | MXPA03002089A (en) |
NO (1) | NO20031112L (en) |
PT (1) | PT1344589E (en) |
SI (1) | SI1344589T1 (en) |
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US20050103461A1 (en) * | 2003-11-19 | 2005-05-19 | Tht Presses, Inc. | Process for generating a semi-solid slurry |
CN102133629A (en) * | 2011-03-01 | 2011-07-27 | 大连理工大学 | Light-alloy electromagnetic suspension casting device and method |
JP5991982B2 (en) * | 2011-11-02 | 2016-09-14 | 大亜真空株式会社 | Arc melting furnace apparatus and arc melting method of object to be melted |
CN102794432A (en) * | 2012-07-24 | 2012-11-28 | 江苏万里活塞轴瓦有限公司 | Device for preparing semisolid-state slurry of aluminum alloy |
JP6171216B2 (en) * | 2013-05-09 | 2017-08-02 | 東芝機械株式会社 | Semi-solid metal production apparatus, semi-solid metal production method, and molding method using semi-solid metal |
CN109351916B (en) * | 2018-07-31 | 2021-03-12 | 湖南人文科技学院 | Preparation method of high-boron alloy |
CN109261940A (en) * | 2018-09-28 | 2019-01-25 | 平顶山学院 | A kind of metal material increasing material manufacturing forming method and device |
CN110538587B (en) * | 2019-09-12 | 2022-03-08 | 福建省鼎智新材料科技有限公司 | Powder spraying semi-solid pulping device based on gas stirring and working method thereof |
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KR20030074297A (en) | 2003-09-19 |
US6988529B2 (en) | 2006-01-24 |
EP1344589B1 (en) | 2008-06-04 |
ES2307838T3 (en) | 2008-12-01 |
ATE397503T1 (en) | 2008-06-15 |
NO20031112D0 (en) | 2003-03-11 |
NO20031112L (en) | 2003-09-15 |
AU2003200990B2 (en) | 2008-05-22 |
CA2420931A1 (en) | 2003-09-13 |
CA2420931C (en) | 2011-05-03 |
US20040003912A1 (en) | 2004-01-08 |
DK1344589T3 (en) | 2008-10-13 |
JP4541650B2 (en) | 2010-09-08 |
CN1443615A (en) | 2003-09-24 |
AU2003200990A1 (en) | 2003-10-02 |
MXPA03002089A (en) | 2004-08-11 |
JP2004025302A (en) | 2004-01-29 |
DE10212349C1 (en) | 2003-08-28 |
BR0300491B1 (en) | 2012-02-07 |
PT1344589E (en) | 2008-08-13 |
EP1344589A3 (en) | 2005-05-18 |
SI1344589T1 (en) | 2008-10-31 |
DE50309939D1 (en) | 2008-07-17 |
CN1275725C (en) | 2006-09-20 |
KR100995490B1 (en) | 2010-11-19 |
BR0300491A (en) | 2004-08-17 |
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