EP1004374B1 - Die casting method and apparatus to produce alloy castings with thixotropic characteristics - Google Patents
Die casting method and apparatus to produce alloy castings with thixotropic characteristics Download PDFInfo
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- EP1004374B1 EP1004374B1 EP98122335A EP98122335A EP1004374B1 EP 1004374 B1 EP1004374 B1 EP 1004374B1 EP 98122335 A EP98122335 A EP 98122335A EP 98122335 A EP98122335 A EP 98122335A EP 1004374 B1 EP1004374 B1 EP 1004374B1
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- casting
- melt
- chamber
- processing chamber
- piston
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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
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- 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
- B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
- B22D17/12—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with vertical press motion
-
- 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
-
- 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
- B22D17/20—Accessories: Details
- B22D17/30—Accessories for supplying molten metal, e.g. in rations
Definitions
- the invention relates to a die casting method for manufacturing of castings from alloys with thixotropic properties a dosage of a given melt volume from a Melt container via a melt line and a pouring passage in a casting chamber with a casting piston and a die, in which the primary crystals formed in the melt are granulated are cooled, the predetermined melt volume, in electromagnetic field mixed and in a semi-rigid Condition is pressed in, during the dosing of the predetermined Melt the casting chamber to the die remains docked and a device for performing the Process.
- a method of the type mentioned at the outset is from WO 97/21509 known.
- a predetermined is in a screw conveyor Melt volume under controlled temperature conditions in brought a semi-rigid state.
- high shear forces form, which melt the melt in the thixotropic state To keep condition.
- there is a dead space which is not emptied when filling the mold, so that the material residues contained therein to inhomogeneities of the according to WO 97/21509 castings produced.
- the casting chamber is filled with the melt from the spoon, there is not one of the incident liquid jet laminar, but a turbulent flow.
- This type of filling the casting chamber leads to a gas absorption of the melt, which in the Casting comes into its own as a gas porosity.
- the object of the invention is the known method and the known devices for performing the method to further develop that reaching the semi-rigid state under controlled conditions so that it is possible as an already metallic suspension with an even distribution is filled from the solid phase into the casting chamber and from there are pressed into the mold cavity of the die can.
- this object is achieved by the Claims 1 and 5 specified features solved.
- the Dosage of the given melt volume is the casting chamber docked to the die and the melt is metered by filling a processing chamber, which by means of a Melt line and the casting channels with a melt container and the casting chamber is connected to a metering piston is provided. It is advantageous in the processing chamber processed a closed melt volume.
- Another advantage of the method according to the invention is in that process formation of metallic suspension already in the melt line begins. For this it is in the melt introduced a cooling powder on this route. By heating and melting the powder, the temperature of the Reduce melt volume and reach that temperature which is necessary for the further process.
- the predetermined melt volume with the cooling powder mixed in the melt line and the resulting metallic suspension both in the processing as well as in the casting chamber touched.
- the filling of the die takes place with the rotating metallic suspension.
- the advantage of this technological design consists in the fact that in the developed from the beginning metallic suspension through the Rotation in the magnetic field is the general or physico-chemical and structural homogeneity and its thixotropic property until the end of the process can be ensured. That the Die casting mold with the rotating metallic Suspension is of fundamental importance, around the castings as close to the final shape as possible to get through the better mold filling.
- the homogeneous metallic suspension formed is ejected from the processing chamber into the casting chamber by means of the metering piston.
- This process phase is carried out by positioning the metering piston and the casting piston in the processing and casting chamber.
- This process step and its technical implementation is one of the most important features of the method according to the invention.
- the predetermined melting volume can be varied by changing the dosing piston position in the processing chamber.
- a melting tank (1) is provided, which by means of a melt line (2) and one Casting aisle (3) with a processing chamber (4) is connected.
- the processing chamber (4) is mounted in the casting chamber (5) so that a casting cycle (6) is designed between them.
- Each of the shown chambers is with dosing (7) and casting pistons (8) provided accordingly.
- the melting line (2) is also with a powder metering device (9) and an electromagnetic stirrer (10) equipped around processing and casting chamber is arranged in a ring.
- the melt (11) comes out of the melt container (1) by means of a raised stopper rod (12) into the melt line (2), where it connects with the cooling powder is cooled. As shown, the powder comes through the powder metering device (9). As a result of the cooling effect of the imported Powder is the temperature of the melt in the area of liquidus temperature. It means that the melt cooled in this way after a short time Time itself "creates" primary crystals, which are due to distribute the rotation evenly throughout the volume and have globular crystalline forms. Around to achieve the mixing of these substances is already on the melt line rotating magnetic field (10) used. The rotating, processed melt flows into the processing chamber (4) with a dosing piston (7) has a starting position (P1-1).
- the caster (6) between the processing and casting chamber is simultaneously with the casting piston (8) sealed off.
- the casting passage (3) becomes the melt line (2) by shifting the for processing chamber (4) provided metering piston (7) in Closed position (P1-2).
- the magnetic field (10) rotates and to the final state the homogeneous metallic suspension (13) brought. Distinguishing features of this Condition are the homogeneous distribution of exogenous and endogenous crystalline forms in the thixotropic metallic matrix, as well as the absence of gross temperature fluctuations.
- processing chamber so around castings with a horizontal arrangement of die casting mold, as well as the Processing chamber by means of vacuum with the Fill the melt.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Medicinal Preparation (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Die Erfindung betrifft ein Druckgießverfahren zur Herstellung von Gußstücken aus Legierungen mit thixotropen Eigenschaften mit einer Dosierung eines vorgegebenen Schmelzevolumens aus einem Schmelzebehälter über eine Schmelzeleitung und einen Gießgang in eine Gießkammer mit einem Gießkolben und einer Druckgießform, bei dem die in der Schmelze entstehenden Primärkristalle granuliert werden, das vorgegebene Schmelzevolumen abgekühlt, im elektromagnetischen Feld vermischt und in einem halberstarrten Zustand eingepresst wird, wobei während der Dosierung des vorgegebenen Schmelzevolumens die Gießkammer an die Druckgießform angedockt bleibt sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a die casting method for manufacturing of castings from alloys with thixotropic properties a dosage of a given melt volume from a Melt container via a melt line and a pouring passage in a casting chamber with a casting piston and a die, in which the primary crystals formed in the melt are granulated are cooled, the predetermined melt volume, in electromagnetic field mixed and in a semi-rigid Condition is pressed in, during the dosing of the predetermined Melt the casting chamber to the die remains docked and a device for performing the Process.
Ein Verfahren der eingangs genannten Art ist aus der WO 97/21509 bekannt. Dabei wird in einem Schneckenförderer ein vorgegebenes Schmelzevolumen unter kontrollierten Temperaturbedingungen in einen halberstarrten Zustand gebracht. In der Förderschnecke bilden sich hohe Scherkräfte aus, die die Schmelze im thixotropen Zustand halten sollen. Zwischen dem Ende oder Auslauf der Förderschnecke und der Gießkammer befindet sich jedoch ein Totraum, der bei der Formfüllung nicht entleert wird, so daß die darin enthaltenen Materialreste zu Inhomogenitäten der nach WO 97/21509 hergestellten Gußstücke führen. A method of the type mentioned at the outset is from WO 97/21509 known. Here, a predetermined is in a screw conveyor Melt volume under controlled temperature conditions in brought a semi-rigid state. In the screw conveyor high shear forces form, which melt the melt in the thixotropic state To keep condition. Between the end or expiry of the Screw conveyor and the casting chamber, however, there is a dead space, which is not emptied when filling the mold, so that the material residues contained therein to inhomogeneities of the according to WO 97/21509 castings produced.
Der sogenannte "halberstarrte Zustand" ist das Ergebnis einer Schmelzebearbeitung in der Gießkammer.The so-called "semi-rigid state" is the result of a Melt processing in the casting chamber.
Das Verfahren nach EP 0 733 421 A1 führt zur Granulation von im vorgegebenen Schmelzevolumen entstehenden Primärkristallen. Nach Bearbeitung dieses Volumens durch Abkühlung und Rühren wird eine Schmelze im halberstarrten Zustand in die Druckgießform gefüllt.The method according to EP 0 733 421 A1 leads to the granulation of im given primary melt volume. To Processing this volume by cooling and stirring becomes one Semi-solidified melt filled into the die.
Wird die Gießkammer aus dem Gießlöffel mit der Schmelze gefüllt, entsteht dort vom einfallenden, flüssigen Strahl nicht eine laminare, sondern eine turbulente Strömung. Diese Füllungsart der Gießkammer führt zu einer Gasaufnahme der Schmelze, die im Gußstück als Gasporosität zur Geltung kommt. Ferner besteht die Notwendigkeit, die Gießkammer von der Druckgießform abzudocken, um die Gießkammer mittels des Gießlöffels mit der Schmelze zu füllen. Dadurch kann die Suspension nicht den erforderlichen homogenen Zustand erreichen.If the casting chamber is filled with the melt from the spoon, there is not one of the incident liquid jet laminar, but a turbulent flow. This type of filling the casting chamber leads to a gas absorption of the melt, which in the Casting comes into its own as a gas porosity. Furthermore, there is Need to undock the casting chamber from the die, around the casting chamber with the melt using the pouring spoon to fill. As a result, the suspension cannot achieve the required achieve homogeneous state.
Aufgabe der Erfindung ist es, das bekannte Verfahren sowie die
zur Durchführung des Verfahrens bekannten Vorrichtungen derart
weiterzuentwickeln, daß ein Erreichen des halberstarrten Zustandes
unter kontrollierten Bedingungen ermöglicht wird, damit es
als schon metallische Suspension mit einer gleichmäßigen Verteilung
von fester Phase in die Gießkammer eingefüllt wird und
von dort in den Formhohlraum der Druckgießform eingepresst werden
kann. Erfindungsgemäß wird diese Aufgabe durch die in den
Patentansprüchen 1 und 5 angegebenen Merkmalen gelöst. Bei der
Dosierung des vorgegebenen Schmelzevolumens ist die Gießkammer
an die Druckgießform angedockt und die Schmelzedosierung erfolgt
durch die Füllung einer Bearbeitungskammer, die mittels einer
Schmelzeleitung und der Gießgänge mit einem Schmelzebehälter und
der Gießkammer verbunden ist und die mit einem Dosierkolben
versehen ist. Vorteilhafterweise wird in der Bearbeitungskammer
ein geschlossenes Schmelzevolumen bearbeitet. The object of the invention is the known method and the
known devices for performing the method
to further develop that reaching the semi-rigid state
under controlled conditions so that it is possible
as an already metallic suspension with an even distribution
is filled from the solid phase into the casting chamber and
from there are pressed into the mold cavity of the die
can. According to the invention, this object is achieved by the
Daraus ergeben sich die folgenden Vorteile:
- Während der Durchführung sowohl der Schmelzedosierung als auch Kammernfüllung ist die Gießkammer nicht von der Druckgießform abgedockt, so daß eine Gasaufnahme aus der Atmosphäre ausgeschlossen ist.
- Die Bearbeitungskammer schafft eine Möglichkeit das geschlossene Schmelzevolumen in der erforderlichen Art zu bearbeiten und von gleichmäßigen Bearbeitungs- und folglich Kristallisationsbedingungen für die vorgegebene Schmelzmenge vor dem Einpressen zu erhalten.
- Das Vorhandensein eines geschlossenen Bearbeitungsraumes erlaubt eine je nach den Anforderungen optimale Füllgeschwindigkeit.
- Die Formierung einer metallischen Suspension, und zwar mit der vorgegebenen Menge fester Phase, ihre gleichmäßige Verteilung in einer metallischen Matrix und mit granulierten Primärkristallen wird im geschlossenen Raum dieser Kammer vollendet.
- During the implementation of both the melt dosing and the chamber filling, the casting chamber is not undocked from the die, so that gas absorption from the atmosphere is excluded.
- The processing chamber creates a possibility to process the closed melt volume in the required manner and to obtain uniform processing and consequently crystallization conditions for the given amount of melt before the pressing.
- The presence of a closed processing area allows an optimal filling speed depending on the requirements.
- The formation of a metallic suspension, with the specified amount of solid phase, its uniform distribution in a metallic matrix and with granulated primary crystals, is accomplished in the closed space of this chamber.
Ein weiterer Vorteil des erfindungsgemäßen Verfahrens besteht darin, daß Prozeßformierung von metallischer Suspension schon in der Schmelzeleitung den Anfang nimmt. Dafür wird in die Schmelze auf dieser Strecke ein kühlendes Pulver eingeführt. Durch Erwärmen und Schmelzen des Pulvers gelingt es, die Temperatur des Schmelzevolumens zu reduzieren und jene Temperatur zu erreichen, die für den weiteren Prozeß erforderlich ist.Another advantage of the method according to the invention is in that process formation of metallic suspension already in the melt line begins. For this it is in the melt introduced a cooling powder on this route. By heating and melting the powder, the temperature of the Reduce melt volume and reach that temperature which is necessary for the further process.
Es wurde erkannt, daß die Eigenschaften eines Gußstückes als Ergebnis des Ablaufs des verhältnismäßig raschen Kristallisationsprozesses in der Schmelze zu sehen sind, der sich zwischen dem für jede Legierung unterschiedlichen aber bekannten Temperaturintervall "Liquidus Solidus" abspielt. In diesem Temperaturintervall wird aber nicht nur das kristalline "Skelett" aufgebaut, sondern es ist auch der Verfahrensabschnitt - zusammen mit dem Temperaturintervall Überhitzungs-Liquidenstemperatur - wo beim Aufbau des kristallinen Gefüges des Gußstücks die im geschmolzenen Metall vorhandenen Defekte in das kristalline Gefüge des Gußstücks geprägt werden, die nach dem Erstarren als Gußfehler erkannt werden. In erster Linie handelt es sich dabei um Gasporositäten, Mikrolunker, Seigerungen und andere physikalisch-chemische und strukturelle Inhomogenitäten.It was recognized that the properties of a casting as Result of the relatively rapid crystallization process in the melt that can be seen between the different but known temperature interval for each alloy "Liquidus Solidus" plays. In this temperature interval not only is the crystalline "skeleton" built up, but it is also the procedural stage - together with the temperature interval superheat liquid temperature - where when building the crystalline structure of the casting that in the melted Metal defects present in the crystalline structure of the casting are embossed, which after solidification as casting defects be recognized. In the first place it is about Gas porosities, micro cavities, segregations and other physico-chemical and structural inhomogeneities.
Die Untersuchung des Herstellungsproblems von qualitativ verbesserten Gußstücken unter Berücksichtigung des im bezeichneten Temperaturintervalls ablaufenden Kristallisationsprozesses zeigte, daß eine beliebige Veränderung, eine Verletzung bzw. ein kurzfristiges Anhalten des Kristallisationsvorgangs zur Verschlechterung des endgültigen Ergebnisses führt. Es wurde erkannt, daß die gewählten Kristallisationsbedingungen nur für ein geschlossenes Kristallisationsvolumen bewahrt werden können. Dies ist für Druckgießverfahren aus Legierungen mit thixotropen Eigenschaften und für Druckgießvorrichtungen von prinzipieller Bedeutung. Die Formgebung des Gußstückes wird im Temperaturintervall "Liquidus-Solidus" aus dem Material durchgeführt, das schon die rheologischen Eigenschaften besitzt. Dabei prägt sich ein solches Material aus, das das tatsächliche Potential des Werkstoffes wiederspiegelt und es bewahrt bei der Gefügeausbildung die ganzen Prozeßbesonderheiten. The study of the manufacturing problem of qualitatively improved Castings taking into account the designated in Temperature interval during the crystallization process, that any change, an injury or a briefly stopping the crystallization process for deterioration of the final result. It was recognized that the chosen crystallization conditions only for one closed crystallization volume can be preserved. This is for die casting processes from alloys with thixotropic Properties and of principle for die casting devices Importance. The shape of the casting is in the temperature interval "Liquidus-Solidus" performed from the material that already has the rheological properties. It is characterized such a material that reflects the actual potential of the Reflects the material and preserves it during microstructure formation the whole process peculiarities.
Durch den Einsatz eines rotierenden Magnetfeldes wird das vorgegebene Schmelzevolumen mit dem kühlenden Pulver in der Schmelzeleitung vermischt und die entstehende metallische Suspension sowohl in der Bearbeitungs- als auch in der Gießkammer gerührt. Die Füllung der Druckgießform erfolgt mit der rotierenden metallischen Suspension. Der Vorzug dieser technologischen Ausgestaltung besteht darin, daß in der von Anfang an herausgebildeten metallischen Suspension durch die Rotation im Magnetfeld die allgemeine bzw physiko-chemische und strukturelle Homogenität festgelegt ist und ihre thixotrope Eigenschaft bis zum Prozeßende sichergestellt werden kann. Daß die Druckgießform mit der rotierenden metallischen Suspension gefüllt wird, ist von grundsätzlicher Bedeutung, um die Gußstücke möglichst endkonturnah durch die bessere Formfüllung zu erhalten. By using a rotating magnetic field the predetermined melt volume with the cooling powder mixed in the melt line and the resulting metallic suspension both in the processing as well as in the casting chamber touched. The filling of the die takes place with the rotating metallic suspension. The advantage of this technological design consists in the fact that in the developed from the beginning metallic suspension through the Rotation in the magnetic field is the general or physico-chemical and structural homogeneity and its thixotropic property until the end of the process can be ensured. That the Die casting mold with the rotating metallic Suspension is of fundamental importance, around the castings as close to the final shape as possible to get through the better mold filling.
Das erfindungsgemäße Verfahren schließt also den gesamten Druckgießvorgang mit vier aufeinanderfolgenden Verfahrensphasen ein:
- die Abkühlung der Schmelze mittels des kühlenden Pulvers und die Vermischung im rotierenden Magnetfeld;
- die Füllung der Bearbeitungskammer mit der abgekühlten Schmelze, die Granulation von entstehenden Primärkristallen, die Formierung der homogenen metallischen Suspension mit den thixotropen Eigenschaften und ihrer Rotation;
- den Transport der metallischen Suspension aus der Bearbeitungskammer in die Gießkammer;
- das Einpressen der rotierenden metallischen Suspension.
- cooling the melt by means of the cooling powder and mixing in the rotating magnetic field;
- the filling of the processing chamber with the cooled melt, the granulation of primary crystals formed, the formation of the homogeneous metallic suspension with the thixotropic properties and their rotation;
- the transport of the metallic suspension from the processing chamber into the casting chamber;
- pressing in the rotating metallic suspension.
Mit Hilfe einer besonderen Ausgestaltung wird die
ausgebildete homogene metallische Suspension
mittels des Dosierkolbens aus der Bearbeitungskammer
in die Gießkammer ausgestoßen. Die
Durchführung dieser Verfahrensphase erfolgt durch
die entsprechende Positionierung des Dosierkolbens
und des Gießkolbens in Bearbeitungs- und
Gießkammer.
Dieser Prozeßschritt und seine technische Umsetzung
gehört zu den wichtigsten Merkmalen des
erfindungsgemäßen Verfahrens.
Mittels der Veränderung der Dosierkolbenposition in
der Bearbeitungskammer kann das vorgegebene
Schmelzvolumen variiert werden. With the help of a special configuration, the homogeneous metallic suspension formed is ejected from the processing chamber into the casting chamber by means of the metering piston. This process phase is carried out by positioning the metering piston and the casting piston in the processing and casting chamber.
This process step and its technical implementation is one of the most important features of the method according to the invention.
The predetermined melting volume can be varied by changing the dosing piston position in the processing chamber.
Die Erfindung wird nachfolgend anhand der Zeichnung im Prinzip noch näher erläutert. Es zeigen
- Fig. 1
- einen Querschnitt durch das Gieß- und Dosiersystem und die Bearbeitungskammer.
- Fig. 2
- die Lage der Gieß- und Dosierkolben, bei der das geschlossene Schmelzvolumen in der Bearbeitungskammer bis zur homoge nen, metallischen Suspension vorbereitet wird.
- Fig. 3
- die Lage der Gieß- und Dosierkolben, bei der die metallische Suspension eingepreßt wird.
- Fig. 4
- eine schematische Darstellung des erfindungsgemäßen Verfahrens, nach dem die Bearbeitungskammer mittels Vakuum mit der Schmelze eingefüllt werden kann.
- Fig. 1
- a cross section through the casting and dosing system and the processing chamber.
- Fig. 2
- the position of the casting and dosing pistons, in which the closed melt volume in the processing chamber is prepared up to the homogeneous, metallic suspension.
- Fig. 3
- the position of the pouring and dosing pistons at which the metallic suspension is pressed.
- Fig. 4
- is a schematic representation of the method according to the invention, by which the processing chamber can be filled with the melt by means of vacuum.
Bei der in Fig. 1 schematisch gezeigten Druckgießmaschine ist ein Schmelzbehälter (1) vorgesehen, der mittels einer Schmelzeleitung (2) und eines Gießgangs (3) mit einer Bearbeitungskammer (4) verbunden ist. Die Bearbeitungskammer (4) ist so in der Gießkammer (5) montiert, daß ein Gießgang (6) zwischen ihnen ausgestaltet ist. Jede der gezeigten Kammern wird mit Dosier- (7) und Gießkolben (8) entsprechend versehen. Die Schmelzeleitung (2) ist auch mit einer Pulverdosiervorrichtung (9) und einer elektromagnetischen Rühreinrichtung (10) ausgerüstet, die um Bearbeitungs- und Gießkammer ringförmig angeordnet ist.In the die casting machine shown schematically in FIG. 1 a melting tank (1) is provided, which by means of a melt line (2) and one Casting aisle (3) with a processing chamber (4) is connected. The processing chamber (4) is mounted in the casting chamber (5) so that a casting cycle (6) is designed between them. Each of the shown chambers is with dosing (7) and casting pistons (8) provided accordingly. The melting line (2) is also with a powder metering device (9) and an electromagnetic stirrer (10) equipped around processing and casting chamber is arranged in a ring.
Auf die zeichnerische Darstellung in Fig. 1 wird insoweit verwiesen. In this respect, the graphic representation in FIG. 1 is used directed.
Die Schmelze (11) gelangt aus dem Schmelzbehälter (1) mittels einer aufgehobenen Stopfenstange (12) in die Schmelzeleitung (2), wo sie mit dem kühlenden Pulver abgekühlt wird. Wie gezeigt, kommt das Pulver durch die Pulverdosiervorrichtung (9). Infolge des Abkühlungseffektes des eingeführten Pulvers liegt die Temperatur der Schmelze im Bereich Liquidustemperatur. Das bedeutet, daß die derart abgekühlte Schmelze bereits nach kurzer Zeit selbst Primärkristalle "erzeugt", die sich wegen der Rotation im ganzen Volumen gleichmäßig verteilen und globular kristalline Formen haben. Um die Vermischung dieser Substanzen zu erreichen, wird schon auf der Schmelzeleitungsstrecke ein rotierendes Magnetfeld (10) eingesetzt. Die rotierende, bearbeitete Schmelze fließt in die Bearbeitungskammer (4), die einen Dosierkolben (7) mit einer Ausgangsposition (P1-1) besitzt. Der Gießgang (6) zwischen der Bearbeitungs- und Gießkammer wird gleichzeitig mit dem Gießkolben (8) abgeriegelt. Nachdem die Bearbeitungskammer (4) mit dem vorgegebenen Schmelzevolumen eingefüllt ist, wird der Gießgang (3) zur Schmelzeleitung (2) mittels der Verschiebung des für Bearbeitungskammer (4) vorgesehenen Dosierkolbens (7) in Position (P1-2) zugemacht. In der geschlossenen Kammer wird der Bearbeitungsprozeß fortgesetzt bzw. die schon abgekühlte Schmelze wird mit dem magnetischen Feld (10) rotiert und bis zum Endzustand der homogenen metallischen Suspension (13) gebracht. Unterscheidungsmerkmale von diesem Zustand sind die homogene Verteilung von exogenen und endogenen kristallinen Formen in der thixotropen metallischen Matrix, sowie das Abwesen von groben Temperaturfluktuationen. Auf diese Weise tritt in der Bearbeitungskammer (4), und zwar kurzfristig, die thixotrope Suspension auf, deren Primärkristalle schon granuliert sind und das Gußgebilde verfeinert ist. In diesem Zustand wird sie mit dem vorgesehenen für die Bearbeitungskammer (4) Dosierkolben (7) nach der Gießkammer (5) ausgestoßen und dafür der Gießkolben (8) auf andere Position (P2-2) versetzt, damit sich der Gießgang (6) befreien läßt. Im Fall des Druckgießvorgangs mit einer vertikalen Anordnung von Druckgießform (14) wird mit der nach unten Gießkolbenversetzung ein entsprechender Raum in Gießkammer (5) eingerichtet, um die homogene thixotrope metallische Suspension aufzunehmen. Danach wird der Gießgang (6) mittels des Dosierkolbens (7) abgeriegelt (P1-3), um das Einpressen der metallischen Suspension durch die Gießkolbenbewegung in der Gießkammer (5) durchzusetzen. Die rotierende Einwirkung des Magnetfelds auf die metallische Suspension wird dabei bis zum Ende des Druckgießverfahrens gedauert und führt dazu, daß die Ausfüllung von Druckgießform durch eine vorwärts rotierende Bewegung der thixotropen metallischen Suspension vorgenommen wird.The melt (11) comes out of the melt container (1) by means of a raised stopper rod (12) into the melt line (2), where it connects with the cooling powder is cooled. As shown, the powder comes through the powder metering device (9). As a result of the cooling effect of the imported Powder is the temperature of the melt in the area of liquidus temperature. It means that the melt cooled in this way after a short time Time itself "creates" primary crystals, which are due to distribute the rotation evenly throughout the volume and have globular crystalline forms. Around to achieve the mixing of these substances is already on the melt line rotating magnetic field (10) used. The rotating, processed melt flows into the processing chamber (4) with a dosing piston (7) has a starting position (P1-1). The caster (6) between the processing and casting chamber is simultaneously with the casting piston (8) sealed off. After the processing chamber (4) filled with the given melt volume , the casting passage (3) becomes the melt line (2) by shifting the for processing chamber (4) provided metering piston (7) in Closed position (P1-2). In the closed Chamber continues the processing process or the already cooled melt is with the magnetic field (10) rotates and to the final state the homogeneous metallic suspension (13) brought. Distinguishing features of this Condition are the homogeneous distribution of exogenous and endogenous crystalline forms in the thixotropic metallic matrix, as well as the absence of gross temperature fluctuations. On this way occurs in the processing chamber (4), and in the short term, the thixotropic suspension, whose primary crystals are already granulated and that Cast structure is refined. In this state them with the intended one for the processing chamber (4) dosing piston (7) after the casting chamber (5) ejected and the casting piston (8) other position (P2-2) so that the Can free the casting (6). In the case of the die casting process with a vertical arrangement of Die casting mold (14) with the downward displacement of the plunger a corresponding room in Casting chamber (5) set up to make the homogeneous to take up thixotropic metallic suspension. Then the casting (6) by means of the metering piston (7) sealed off (P1-3) to press fit the metallic suspension due to the movement of the plunger enforce in the casting chamber (5). The rotating action of the magnetic field the metallic suspension will finish of the die casting process took and leads that the filling of die through a forward rotating movement of the thixotropic metallic suspension is made.
In weiterer Ausgestaltung der Erfindung ist es ebenso möglich, die Bearbeitungskammer so anzuordnen, um Gußstücke mit einer waagerechten Anordnung von Druckgießform zu erzeugen, sowie die Bearbeitungskammer mittels Vakuum mit der Schmelze einzufüllen.In a further embodiment of the invention, it is also possible to arrange the processing chamber so around castings with a horizontal arrangement of die casting mold, as well as the Processing chamber by means of vacuum with the Fill the melt.
Erste Versuche mit dem erfindungsgemäßen Verfahren haben deutlich gezeigt, daß sich mit einer zusätzlichen und solchermaßen angeordneten Bearbeitungskammer (4) die Funktionsfähigkeit des gesamten Druckvorgangs beträchtlich erhöht und typische Gußfehler wie Gasausschüsse, Lunker, strukturelle Inhomogenität nicht auftreten sowie daß dies nur durch eine Isotropie von thixotropen Eigenschaften der metallischen Suspension sichergestellt wird.First attempts with the method according to the invention have clearly shown that with a additional processing chamber arranged in this way (4) the functionality of the entire printing process increased considerably and typical casting defects such as gas rejects, blowholes, structural inhomogeneity does not occur and that this is only due to an isotropy of thixotropic properties the metallic suspension ensured becomes.
Claims (5)
- A pressure die casting process of producing castings from alloys with thixotropic properties, by dispensing a pre-determined melt volume from a melt container (1) via a melt channel (2) and a casting path (3) into a casting chamber (5) having a casting piston (8) and a casting mould (14), wherein the primary crystals contained in the melt are granulated, wherein the predetermined melt volume is cooled, mixed in an electro-magnetic field (10) and pressed in in a semi-solidified condition and wherein, while the predetermined melt volume is dispensed, the casting chamber (5) remains coupled to the casting mould (14),
characterised ina) that the predetermined melt volume is dispensed by filling a processing chamber (4) which is connected to the casting chamber (5) by means of a casting path (6) and provided with a dispensing piston,b) that, after the processing chamber (4) has been filled via the melt channel (2), the casting path (3) is closed by displacing the dispensing piston (7),c) that the predetermined melt volume is cooled by a cooling powder, for which purpose a suitable quantity of powder is introduced into the melt channel (2) by a powder dispensing device (9),d) that, by using a rotating magnetic field, the predetermined melt volume is mixed with the cooling powder in the melt channel (2),e) that the resulting metallic suspension is stirred both in the processing chamber (4) and in the casting chamber (5) until a condition of a homogeneous metallic suspension (13) with primary crystals and a uniform distribution of the solid phase has been reached, andf) that the casting mould (14) is filled with a homogeneous thixotropic metallic suspension (13) while the latter is being pressed in while rotatingly moving forward. - A pressure die casting process according to claim 1,
characterised in that a closed melt volume is processed in the processing chamber (4). - A pressure die casting process according to any one of the preceding claims,
characterised in that the homogeneous metallic suspension (13) with the thixotropic properties is transported by the dispensing piston (7) from the processing chamber (4) via the casting path (6) to the casting chamber (5). - A pressure die casting process according to any one of the preceding claims,
characterised in that the entire pressure die casting process consists of the four successive process phases which include the following main process operations:wherein the above-mentioned process phases are carried out by suitably positioning the dispensing piston (7) and the casting piston (8) both in the processing chamber (4) and in the casting chamber (5).cooling the melt by means of the cooling powder and mixing the melt with said powder in the rotating magnetic field (10);filling the processing chamber (4) with the cooled melt, granulating the primary crystals which occur, and rotating the homogeneous metallic suspension (13) and creating the thixotropic properties;transporting the metallic suspension (13) from the processing chamber (4) into the casting chamber (5);pressing the metallic suspension (13) into the mould; - A pressure die casting device for carrying out a pressure die casting process of producing castings from alloys with thixotropic properties, consisting of a casting chamber (5) with casting pistons (8) and a casting mould (14), wherein the melt is guided from a melt container (1) via a melt channel (2) and a casting path (3) into a processing chamber (4) comprising a dispensing piston (7), wherein between the casting chamber (5) and the processing chamber (4), there is arranged a casting path (6),
characterised in that the melt channel (2) comprises a powder dispensing device (9) and that the melt channel (2) is provided with an electro-magnetic stirring device (10).
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE59803079T DE59803079D1 (en) | 1998-11-25 | 1998-11-25 | Die casting process for the production of castings from alloys with thixotropic properties and device for carrying out the process |
| EP98122335A EP1004374B1 (en) | 1998-11-25 | 1998-11-25 | Die casting method and apparatus to produce alloy castings with thixotropic characteristics |
| AT98122335T ATE213187T1 (en) | 1998-11-25 | 1998-11-25 | DIE CASTING PROCESS FOR PRODUCING CASTINGS FROM ALLOYS WITH THIXOTROPIC PROPERTIES AND DEVICE FOR CARRYING OUT THE PROCESS |
| KR1019990048524A KR20000035226A (en) | 1998-11-25 | 1999-11-04 | Die casting method for manufacturing castings made of alloy with thixotropic property |
| JP11332503A JP3125878B2 (en) | 1998-11-25 | 1999-11-24 | Method and apparatus for producing die casting of casting made of thixotropic alloy |
| CN99125828A CN1256982A (en) | 1998-11-25 | 1999-11-25 | Pressure casting method for making alloy cast with thixotropy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP98122335A EP1004374B1 (en) | 1998-11-25 | 1998-11-25 | Die casting method and apparatus to produce alloy castings with thixotropic characteristics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1004374A1 EP1004374A1 (en) | 2000-05-31 |
| EP1004374B1 true EP1004374B1 (en) | 2002-02-13 |
Family
ID=8233031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98122335A Expired - Lifetime EP1004374B1 (en) | 1998-11-25 | 1998-11-25 | Die casting method and apparatus to produce alloy castings with thixotropic characteristics |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1004374B1 (en) |
| JP (1) | JP3125878B2 (en) |
| KR (1) | KR20000035226A (en) |
| CN (1) | CN1256982A (en) |
| AT (1) | ATE213187T1 (en) |
| DE (1) | DE59803079D1 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10002670C2 (en) * | 2000-01-24 | 2003-03-20 | Ritter Aluminium Giesserei Gmb | Die casting process and device for carrying it out |
| DE10043717A1 (en) * | 2000-09-04 | 2002-03-14 | Buehler Druckguss Ag Uzwil | Process for compressive reforming of aluminum or magnesium alloys comprises conveying the liquid or liquid material from a preparation chamber into a casting chamber of a die casting machine |
| DE10110769C1 (en) * | 2001-03-07 | 2002-10-17 | Federal Mogul Nuernberg Gmbh | Production of a thixotropic pre-material used in the manufacture of pistons for internal combustion engines comprises introducing a solid super eutectic aluminum-silicon alloy into an extruder |
| DE10236794A1 (en) | 2002-08-10 | 2004-02-26 | Demag Ergotech Gmbh | Casting metals comprises heating a solid metallic starting material in a container using an inductive heater above the solidus temperature, feeding to a storage vessel |
| JP3549055B2 (en) * | 2002-09-25 | 2004-08-04 | 俊杓 洪 | Die casting method for metal material molding in solid-liquid coexistence state, apparatus therefor, die casting method for semi-solid molding and apparatus therefor |
| KR100578257B1 (en) * | 2003-06-03 | 2006-05-15 | 고동근 | Die casting machine |
| KR100554093B1 (en) * | 2004-02-04 | 2006-02-22 | 주식회사 나노캐스트코리아 | Forming apparatus for rheoforming method |
| US20070277953A1 (en) * | 2006-06-01 | 2007-12-06 | Ward Gary C | Semi-solid material formation within a cold chamber shot sleeve |
| DE102009032319A1 (en) * | 2009-07-09 | 2011-01-13 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Extruder for producing a component from light metal by a semi-solid-process, comprises a cylinder in which a conveyor screw is arranged, a drive for the conveyor screw, and a device for loading the cylinder with a material to be extruded |
| KR101212328B1 (en) | 2010-03-11 | 2012-12-13 | 주식회사 큐빅스 | Die casting device and die casting method |
| CN104107885A (en) * | 2013-12-25 | 2014-10-22 | 南昌大学 | Semi-solid slurry cleaning and producing device |
| CN103978180A (en) * | 2014-06-04 | 2014-08-13 | 宁波中桥精密机械有限公司 | Air entrainment prevention aluminum alloy cold chamber die casting machine |
| CN103978182A (en) * | 2014-06-04 | 2014-08-13 | 宁波中桥精密机械有限公司 | Air entrapment prevention leak-proof material tube assembly of cold chamber die-casting machine |
| KR102442579B1 (en) * | 2015-12-01 | 2022-09-08 | 재단법인 포항산업과학연구원 | Method for manufacturing titanium casting parts |
| CN109093095A (en) * | 2018-11-03 | 2018-12-28 | 莆田市荣兴机械有限公司 | A kind of casting mould and preparation method thereof for horizontal liquor charging vertical injection |
| CN112872324A (en) * | 2021-03-09 | 2021-06-01 | 漳州金诚精密制造有限公司 | Automatic change aluminum alloy die-casting assembly line |
| CN113102718A (en) * | 2021-03-09 | 2021-07-13 | 漳州金诚精密制造有限公司 | Intelligent aluminum alloy die-casting equipment |
| CN113084118A (en) * | 2021-03-09 | 2021-07-09 | 漳州金诚精密制造有限公司 | High-efficient die-casting system of aluminum alloy |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1287597A (en) * | 1995-12-12 | 1997-07-03 | Thixomat, Inc. | Apparatus for processing semisolid thixotropic metallic slurries |
-
1998
- 1998-11-25 DE DE59803079T patent/DE59803079D1/en not_active Expired - Fee Related
- 1998-11-25 AT AT98122335T patent/ATE213187T1/en not_active IP Right Cessation
- 1998-11-25 EP EP98122335A patent/EP1004374B1/en not_active Expired - Lifetime
-
1999
- 1999-11-04 KR KR1019990048524A patent/KR20000035226A/en active IP Right Grant
- 1999-11-24 JP JP11332503A patent/JP3125878B2/en not_active Expired - Fee Related
- 1999-11-25 CN CN99125828A patent/CN1256982A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE59803079D1 (en) | 2002-03-21 |
| ATE213187T1 (en) | 2002-02-15 |
| JP3125878B2 (en) | 2001-01-22 |
| KR20000035226A (en) | 2000-06-26 |
| EP1004374A1 (en) | 2000-05-31 |
| JP2000158118A (en) | 2000-06-13 |
| CN1256982A (en) | 2000-06-21 |
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