EP1706515B1 - Mixing device - Google Patents

Mixing device Download PDF

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Publication number
EP1706515B1
EP1706515B1 EP05700317A EP05700317A EP1706515B1 EP 1706515 B1 EP1706515 B1 EP 1706515B1 EP 05700317 A EP05700317 A EP 05700317A EP 05700317 A EP05700317 A EP 05700317A EP 1706515 B1 EP1706515 B1 EP 1706515B1
Authority
EP
European Patent Office
Prior art keywords
elevation
channel
measuring device
mixing
feed channel
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.)
Not-in-force
Application number
EP05700317A
Other languages
German (de)
French (fr)
Other versions
EP1706515A1 (en
Inventor
Benno Niedermann
Jörg Frei
Ulrich Binder
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.)
Buehler Druckguss AG
Original Assignee
Buehler Druckguss AG
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 Buehler Druckguss AG filed Critical Buehler Druckguss AG
Publication of EP1706515A1 publication Critical patent/EP1706515A1/en
Application granted granted Critical
Publication of EP1706515B1 publication Critical patent/EP1706515B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • C22C1/08—Alloys with open or closed pores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/005—Casting metal foams
    • 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
    • C22C1/08—Alloys with open or closed pores
    • C22C1/083—Foaming process in molten metal other than by powder metallurgy
    • C22C1/086—Gas foaming process

Definitions

  • the invention relates to a mixing device, in particular for mixing light metal melts with powdered or granular substances, preferably for mixing aluminum melt with a blowing agent.
  • a powder of a copper alloy is filled in a wire, and this is then supplied to a molten metal mass.
  • a powdery or granular substance is metered from a container into a molten metal, wherein the container has a downwardly tapering part, at the bottom of which at least one nozzle and above an ejector are provided.
  • the nozzle is connected to a carrier gas line and the ejector is connected to a mixture-carrying line.
  • a gas stream is passed continuously and independently of solids into a mixing chamber.
  • the solids are carried into the interior of a molten metal, wherein between the feed line and molten metal, a rotational movement is generated.
  • the DE-A-3612613 teaches a device in which a channel for molten pig iron has tuyeres or puffs.
  • the invention has for its object to provide a mixing device that allows an efficient mixing of a powdered blowing agent with an aluminum melt shortly before or during the filling of the melt in a die casting tool.
  • the solution of the problem is achieved with the features of the claim.
  • the invention is based on the recognition that it is suitable for the production of foamed metal bodies, in particular of integral foam, for example according to the WO-A-02/060621 is required, the propellant during the filling evenly to disperse in the melt and to achieve complete foaming in the mold.
  • This is achieved with the sprue channel designed according to the invention with mixing elements in a one-stage mixing and foaming process.
  • the mixing element has a multi-stage design and can be adapted to different volumes.
  • the runner is provided with an increase or constriction at which a back pressure arises, followed by a pressure drop.
  • the increase can be formed over the entire width (inner diameter) of the sprue or even partially filling.
  • the propellant is added by means of a hydraulic cylinder in the sprue with at least one pin to the liquid light metal stream, preferably in the center of the sprue. At least one more chicane can follow the increase or narrowing.
  • the elements of the mixing device and rearrangements in the molten metal flow cause a sufficient distribution of the blowing agent in the metal stream.
  • the powdered or granular substances may also other metals or ceramic particles u. a. include. Due to the blowing agent supply by means of mixers with respect. Way and time as a function of Griesskolbenweg a better process stability is achieved.
  • the mixer elements are exchangeable as a wear part.
  • the invention will be described below in an embodiment with reference to a drawing.
  • the drawing shows the mixing device in a runner.
  • a sprue 1 of a die-casting mold is internally provided with an elevation 4, which causes a constriction of the cross-section and thus a back pressure.
  • the elevation 4 three pin channels 2 open into the sprue.
  • two baffles 6 are spaced apart from the elevation 4. The flow rate of the melt stream is, according to the method, high.
  • the propellant is injected in the pin channels 2 at the same time by means of a cylinder 3 in the melt stream.
  • the pin channels 2 have an inner diameter depending on the size of the part to be cast.
  • the pin channels 2 can be arranged side by side or offset from each other.
  • the middle part 10 of the sprue 1 can be designed as a wear part easily replaceable.
  • the elevation 4 is formed as a hump or ramp, at which the melt flow, depending on the design of the elevation 4, can flow past the left and right or beyond it.
  • the different flow rates promote the mixing of the melt with the blowing agent.
  • the metal front is detected and converted into a signal, this signal serves as the basis for the automatic corrections for Giessprofil and retraction of / the cylinder 3 regardless of the amount of metal is filled.
  • the same sensor signal is used to complete the injection process before the cavity is 100% full.
  • the signals can be placed on the casting diagram for visualization and controlled there and can thus be assigned to a casting piston waypoint.
  • the invention is not limited to this specific embodiment.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Continuous Casting (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to a mixing device, in particular for mixing a light metal melt which is provided with a powdery or granulate-type material in the suction channel (1) of a form. The material, in particular a raising agent, is used to form integral foam. The suction channel (1) comprises an inner elevation (4) which is associated with at least one channel in order to inject the material.

Description

Die Erfindung betrifft eine Mischvorrichtung, insbesondere zum mischen von Leichtmetallschmelzen mit pulver- oder granulatförmigen Stoffen, bevorzugt zum mischen von Aluminiumschmelze mit einem Treibmittel.The invention relates to a mixing device, in particular for mixing light metal melts with powdered or granular substances, preferably for mixing aluminum melt with a blowing agent.

Gemäss der DE-A-2810537 wird ein Pulver einer Kupferlegierung in einen Draht gefüllt und dieser wird dann einer geschmolzenen Metallmasse zugeführt. Nach der DE-A-3508620 wird ein pulverförmiger oder körniger Stoff aus einem Behälter in eine Metallschmelze dosiert, wobei der Behälter ein sich nach unten verjüngendes Teil aufweist, an dessen Boden wenigstens eine Düse und oberhalb desselben ein Ejektor vorgesehen sind. Die Düse ist an eine Trägergasleitung und der Ejektor ist an eine gemischtransportierende Leitung angeschlossen.According to the DE-A-2810537 For example, a powder of a copper alloy is filled in a wire, and this is then supplied to a molten metal mass. After DE-A-3508620 For example, a powdery or granular substance is metered from a container into a molten metal, wherein the container has a downwardly tapering part, at the bottom of which at least one nozzle and above an ejector are provided. The nozzle is connected to a carrier gas line and the ejector is connected to a mixture-carrying line.

Bei einem Verfahren gemäss DE-A-2326603 wird ein Gasstrom kontinuierlich und unabhängig von Feststoffen in eine Mischkammer geleitet. Durch den als Treibmittel dienenden Gasstrahl werden die Feststoffe in das Innere einer Metallschmelze getragen, wobei zwischen Zuleitung und Metallschmelze eine Rotationsbewegung erzeugt wird.In a method according to DE-A-2326603 a gas stream is passed continuously and independently of solids into a mixing chamber. By serving as a propellant gas jet, the solids are carried into the interior of a molten metal, wherein between the feed line and molten metal, a rotational movement is generated.

Die DE-A-3612613 lehrt eine Vorrichtung, bei die einer Rinne für Roheisenschmelze Blasdüsen oder Blassteine aufweist.The DE-A-3612613 teaches a device in which a channel for molten pig iron has tuyeres or puffs.

Der Erfindung liegt die Aufgabe zugrunde, eine Mischvorrichtung zu schaffen, die ein effizientes vermischen eines pulverförmigen Treibmittels mit einer Aluminiumschmelze kurz vor bzw. während des Einfüllens der Schmelze in ein Druckgiesswerkzeug ermöglicht. Die Lösung der Aufgabe erfolgt mit den Merkmalen des Patentanspruchs.The invention has for its object to provide a mixing device that allows an efficient mixing of a powdered blowing agent with an aluminum melt shortly before or during the filling of the melt in a die casting tool. The solution of the problem is achieved with the features of the claim.

Die Erfindung geht von der Erkenntnis aus, dass es zur Herstellung von geschäumten Metallkörpern, insbesondere aus lntegralschaum, zum Beispiel gemäss der WO-A-02/060621 erforderlich ist, das Treibmittel während des Einfüllvorganges gleichmässig in der Schmelze zu verteilen und ein vollständiges ausschäumen in der Form zu erreichen. Dies wird mit dem erfindungsgemäss mit Mischelementen ausgestalteten Angusskanal in einem einstufigen Misch- und Schäumprozess erreicht. Das Mischelement ist mehrstufig aufgebaut und an unterschiedliche Volumina anpassbar.The invention is based on the recognition that it is suitable for the production of foamed metal bodies, in particular of integral foam, for example according to the WO-A-02/060621 is required, the propellant during the filling evenly to disperse in the melt and to achieve complete foaming in the mold. This is achieved with the sprue channel designed according to the invention with mixing elements in a one-stage mixing and foaming process. The mixing element has a multi-stage design and can be adapted to different volumes.

Der Angusskanal ist mit einer Erhöhung bzw. Verengung versehen, an der ein Staudruck entsteht, gefolgt von einem Druckabfall.The runner is provided with an increase or constriction at which a back pressure arises, followed by a pressure drop.

Bevorzugte Ausgestaltungen sind in den Unteransprüchen offenbart.Preferred embodiments are disclosed in the subclaims.

Die Erhöhung kann über die gesamte Breite (Innendurchmesser) des Angusskanales oder auch nur teilweiseausfüllend ausgebildet sein. Bevorzugt wird das Treibmittel mittels eines hydraulischen Zylinders im Angusskanal mit mindestens einem Stift dem flüssigen Leichtmetallstrom beigegeben, bevorzugt im Zentrum des Angusskanals. Auf die Erhöhung bzw. Verengung kann mindestens eine weitere Schikane folgen.The increase can be formed over the entire width (inner diameter) of the sprue or even partially filling. Preferably, the propellant is added by means of a hydraulic cylinder in the sprue with at least one pin to the liquid light metal stream, preferably in the center of the sprue. At least one more chicane can follow the increase or narrowing.

Die Elemente der Mischvorrichtung sowie Umschichtungen im Metallschmelzestrom bewirken eine ausreichende Verteilung des Treibmittels im Metallstrom. Die pulver- bzw. granulatförmigen Stoffe können auch andere Metalle oder Keramikteilchen u. a. umfassen. Durch die Treibmittelzuführung mittels Mischer bzgl. Weg und Zeitpunkt in Abhängigkeit vom Griesskolbenweg wird eine bessere Prozessstabilität erreicht.The elements of the mixing device and rearrangements in the molten metal flow cause a sufficient distribution of the blowing agent in the metal stream. The powdered or granular substances may also other metals or ceramic particles u. a. include. Due to the blowing agent supply by means of mixers with respect. Way and time as a function of Griesskolbenweg a better process stability is achieved.

Die Mischerelemente sind als Verschleissteil austauschbar.The mixer elements are exchangeable as a wear part.

Die Erfindung wird nachfolgend in einem Ausführungsbeispiel anhand einer Zeichnung näher beschrieben. Die Zeichnung zeigt die Mischvorrichtung in einem Angusskanal.The invention will be described below in an embodiment with reference to a drawing. The drawing shows the mixing device in a runner.

Ein Angusskanal 1 einer Druckgiessform ist innen mit einer Erhöhung 4 versehen, die eine Verengung des Querschnittes und somit einen Staudruck bewirkt. In der Erhöhung 4 münden drei Stiftkanäle 2 in den Angusskanal. In Fliessrichtung 5 des Aluminiumschmelzestromes folgen auf die Erhöhung 4 beabstandet zwei Schikanen 6. Die Fliessgeschwindigkeit des Schmelzestromes ist verfahrensgemäss hoch.A sprue 1 of a die-casting mold is internally provided with an elevation 4, which causes a constriction of the cross-section and thus a back pressure. In the elevation 4 three pin channels 2 open into the sprue. In the direction of flow 5 of the molten aluminum stream, two baffles 6 are spaced apart from the elevation 4. The flow rate of the melt stream is, according to the method, high.

Auf den Staudruck an der Erhöhung 4 folgt ein Druckabfall zwischen Erhöhung 4 und den Schikanen 6.The back pressure at the elevation 4 is followed by a pressure drop between elevation 4 and the harassment 6.

Bevorzugt wird das Treibmittel in den Stiftkanälen 2 gleichzeitig mittels eines Zylinders 3 in den Schmelzestrom injiziert. Die Stiftkanäle 2 weisen einen Innendurchmesser in Abhängigkeit von der Grösse des zu giessenden Teiles auf. Die Stiftkanäle 2 können nebeneinander oder zueinander versetzt angeordnet sein. Das Mittelteil 10 des Angusskanales 1 kann als Verschleissteil leicht auswechselbar ausgebildet sein.Preferably, the propellant is injected in the pin channels 2 at the same time by means of a cylinder 3 in the melt stream. The pin channels 2 have an inner diameter depending on the size of the part to be cast. The pin channels 2 can be arranged side by side or offset from each other. The middle part 10 of the sprue 1 can be designed as a wear part easily replaceable.

Die Erhöhung 4 ist als Buckel bzw. Rampe ausgebildet, an der der Schmelzestrom je nach Gestaltung der Erhöhung 4 links und rechts oder über diesen hinweg vorbeifliessen kann. Die unterschiedlichen Strömungsgeschwindigkeiten befördern die Durchmischung der Schmelze mit dem Treibmittel.The elevation 4 is formed as a hump or ramp, at which the melt flow, depending on the design of the elevation 4, can flow past the left and right or beyond it. The different flow rates promote the mixing of the melt with the blowing agent.

Es können automatische Korrekturen während des Einspressvorganges am Giessprofil und dem Einfahren des/der Zylinder 3 mit Treibmittel realisiert werden.It can be realized automatic corrections during the Einspressvorganges Giessprofil and retraction of / the cylinder 3 with propellant.

Durch einen Sensor im Giesskanal wird die Metallfront erfasst und in ein Signal umgewandelt, dieses Signal dient als Basis für die automatischen Korrekturen für Giessprofil und Einfahren des/der Zylinder 3 unabhängig von der Metallmenge die eingefüllt wird.Through a sensor in the casting channel, the metal front is detected and converted into a signal, this signal serves as the basis for the automatic corrections for Giessprofil and retraction of / the cylinder 3 regardless of the amount of metal is filled.

Das gleiche Sensorsignal wird eingesetzt um den Einpressvorgang zu beenden bevor die Kavität zu 100% gefüllt ist.The same sensor signal is used to complete the injection process before the cavity is 100% full.

Die Signale können zur Visualisierung auf das Giessdiagramm aufgelegt werden und dort kontrolliert werden und können somit einem Giesskolben-Wegpunkt zugeordnet werden.The signals can be placed on the casting diagram for visualization and controlled there and can thus be assigned to a casting piston waypoint.

Die Erfindung ist nicht auf diese konkrete Ausführungsform begrenzt.The invention is not limited to this specific embodiment.

Bezugszeichenreference numeral

11
Angusskanalrunner
22
Stiftkanalpin passage
33
Zylindercylinder
44
Erhöhungincrease
55
Fliessrichtungflow direction
66
Schikanechicane
1010
Mittelteilmidsection

Claims (6)

  1. A mixing device, in particular for mixing light molten metal with powdery or granular materials in a feed channel (1) of a mold, wherein the inside of the feed channel (1) exhibits an elevation (4), to which at least one channel for injecting a powdery or granular material is allocated.
  2. The measuring device according to claim 1, characterized in that the elevation (4) is formed over the entire width of the feed channel (1).
  3. The measuring device according to claim 1 or 2, characterized in that three pin channels (2) are provided for injecting the blowing agent.
  4. The measuring device according to one of claims 1 to 3, characterized in that the at least one channel for injection in the elevation (4) is preferably situated on the side facing downstream.
  5. The measuring device according to one of claims 1 to 4, characterized in that at least one baffle plate (6) follows a distance from the elevation (4) in the direction of flow.
  6. The measuring device according to one of claims 1 to 5, characterized in that a metal front sensor is arranged in the casting channel/feed channel.
EP05700317A 2004-01-23 2005-01-18 Mixing device Not-in-force EP1706515B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004003743A DE102004003743A1 (en) 2004-01-23 2004-01-23 mixing device
PCT/CH2005/000022 WO2005071122A1 (en) 2004-01-23 2005-01-18 Mixing device

Publications (2)

Publication Number Publication Date
EP1706515A1 EP1706515A1 (en) 2006-10-04
EP1706515B1 true EP1706515B1 (en) 2007-07-18

Family

ID=34745095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05700317A Not-in-force EP1706515B1 (en) 2004-01-23 2005-01-18 Mixing device

Country Status (5)

Country Link
EP (1) EP1706515B1 (en)
AT (1) ATE367454T1 (en)
DE (2) DE102004003743A1 (en)
ES (1) ES2289686T3 (en)
WO (1) WO2005071122A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007001780A1 (en) 2007-01-05 2008-07-10 Bühler Druckguss AG Process for the production of fiber-reinforced die-cast parts

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1164102B (en) * 1956-03-19 1964-02-27 Lor Corp Process for the production of metal foam bodies
DE10104339A1 (en) * 2001-02-01 2002-08-08 Goldschmidt Ag Th Process for the production of metal foam and metal body produced thereafter
DE10104338A1 (en) * 2001-02-01 2002-08-08 Goldschmidt Ag Th Production of flat, metallic integral foams

Also Published As

Publication number Publication date
ATE367454T1 (en) 2007-08-15
WO2005071122A1 (en) 2005-08-04
ES2289686T3 (en) 2008-02-01
EP1706515A1 (en) 2006-10-04
DE102004003743A1 (en) 2005-08-11
DE502005001055D1 (en) 2007-08-30

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