EP1537928B1 - Method and apparatus for producing a thixotropic alloy - Google Patents
Method and apparatus for producing a thixotropic alloy Download PDFInfo
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- EP1537928B1 EP1537928B1 EP03405858A EP03405858A EP1537928B1 EP 1537928 B1 EP1537928 B1 EP 1537928B1 EP 03405858 A EP03405858 A EP 03405858A EP 03405858 A EP03405858 A EP 03405858A EP 1537928 B1 EP1537928 B1 EP 1537928B1
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- alloy
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- metal
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 16
- 239000000956 alloy Substances 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 25
- 230000009974 thixotropic effect Effects 0.000 title claims description 13
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 20
- 238000005266 casting Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 5
- 230000009969 flowable effect Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005058 metal casting Methods 0.000 claims description 2
- 238000010008 shearing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 210000001787 dendrite Anatomy 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 9
- 238000003825 pressing Methods 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 6
- 239000010439 graphite Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- 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
Definitions
- the invention relates to a method and a device for casting a thixotropic metal alloy, namely a method according to the preamble of claim 1 and a device according to the preamble of claim 3.
- metal alloys in particular aluminum alloys come into question, such as AlSiMg alloys.
- the alloying components such as aluminum, silicon and magnesium are heated in a blast furnace and mixed together in a liquid state.
- the metal mixture thus formed is then passed by means of a conveying and / or pressing device in a casting apparatus, in which the mixture is then cast into bolts and the like, as is well known in the aluminum industry.
- a method of producing a desired fine structure in metal casting which consists in atomizing the liquid metal by means of a gas flow and causing the metal droplets to impinge on a cooling surface in order to obtain a pourable material.
- a thixotropic metal alloy is characterized in particular by a globular, globular structure.
- the liquid metal alloy is passed through a structural converter during the cooling process, ie during the transition from the liquid to the solid state, and subjected to shear stress in such a way that the solid phases which form during pre-solidification, but in particular the dendrites which form during this process to convert spherical, globular particles with a diameter of a few tens of microns.
- the object underlying the invention is now to provide a method and a device for the production of thixotropic metal alloys.
- the aim is to keep the alloy in a flowable state during the production process in order to obtain a product which has the most homogeneous globular structure possible. Accordingly, it should be achieved during manufacture that this product is in fact completely thixotropic and can be ejected vertically or horizontally into a casting device for producing bolts and the like.
- thixotropic metal alloys For the production of thixotropic metal alloys, it is necessary, in particular, to set the parameters to be set in advance for carrying out the method, such as, conveying speed, Pressure and temperature depending on the metal mixture used and the dimensions of the device described below in more detail match.
- the flowable metal alloy is introduced into the cylindrical interior of a press or pump designed as a conveying and / or pressing device, which has a cylindrical chamber with an inlet and an outlet.
- a rotatable rod stirrer is arranged as a mechanical conveyor and / or stirrer.
- the rod stirrer in this case has a respective end located in the outlet of the cylindrical chamber, which according to the invention is designed as a structural converter and has at least one radially outwardly directed passage in the flow direction, through which the flowable metal alloy passes during operation of the device into a casting device with a bell-like Interior is pressed.
- a device for producing an aluminum alloy of the class AlSiMg which is shown as a whole and designated 1 as a whole, has a supply device 2. This has a funnel-shaped cylinder 3 consisting of refractory concrete.
- the outlet 4 of the feed device 2 is connected via a seal 5 to the inlet 6 of a conveying and pressing device 7.
- This has a metallic shell 8 and a chamber formed by a graphite tube 9 with a vertical axis and an interior 10.
- the graphite tube 9 may of course be made of a different material, such as a ceramic body, depending on the metal alloy to be treated ,
- an axial Stabrrocker 11 is guided, which is connected to a outside of the conveying and pressing device 7 arranged speed-adjustable - not shown - drive device.
- the Stabrrocker 11 extending through the graphite tube 9 is substantially in two parts and has a cylindrical rod 12 and a rotor head 13 seated in the chamber outlet and serving as a structural converter.
- the rotor head 13 and the rod 12 are made of graphite, for example, preferably at least partially tubular Rod 13 then additionally has a metallic core 14.
- the bottom end of the graphite tube 9 forming the chamber outlet opens into the bell-shaped interior 15 of a first mold 16.
- This mold 16 for example made of monolith, sits on a second, water-cooled mold 17 of metallic material with a cooling water ring 18 not drawn in detail.
- the rotor head 13 of the rod agitator 11 is seated with its upper cylindrical portion 13a fits snugly in the chamber outlet of the conveying and / or pressing device 7 forming pipe end portion 9a.
- the lower cylindrical portion 13b is located in the inner space 15 of the mold 16 and has an over the portion 13a projecting annular shoulder, with which it comes to lie with a small distance below the front end of the tube 9.
- the trained in particular as a structural converter and at its end advantageously to a tip 13c tapered rotor head 13 has finally several, for example four, radially outward in the flow direction, the interiors 10 and 15 interconnecting passages 19, as in the FIGS. 2 and 3 is shown in detail.
- the rod 12 of the rod agitator 11 is now dimensioned such that the cross section of the annular gap between the rod 12 and the graphite tube 9 is preferably about 5 mm.
- the number, shape and size of the passages 19 may vary depending on the size of the device and the metal alloy to be treated.
- the rotor head 13 has at least four uniformly distributed over its circumference passages 19th
- the feeding device 2 feeds the liquid AlSiMg metal mixture of the conveying and pressing device 7 received by an unrecorded reservoir at a temperature of, for example, 650 ° C to 700 ° C.
- the feed can be carried out both batchwise and continuously, so that then the subsequent casting process can optionally be carried out batchwise or continuously.
- the metal mixture By gravity, but also by the conveying action of the rod agitator 11, the metal mixture reaches the chamber outlet of the conveying and / or pressing device. In this case, the liquid metal mixture can begin to solidify and form dendrites, which in turn are characterized by a branched, tree-like thread structure.
- this dendritic formation is now suppressed in the inventive method already by the action of the rotating rod stirrer 11, so that thereby the metal suspension can be kept almost dendritic free.
- the still flowable metal mixture is then passed or pushed through the rotor head 13 designed as a structural converter, that is to say through its passages 19. Since the rotor head 13 rotates continuously during operation, the material passed through the passages 19 is moved radially and centrifugally pressed against the inner wall 16 a of the bell-shaped mold 16. This results in high shear stresses through which any remaining dendrites are broken up and broken down into spherical particles and the formation of new dendrites is prevented.
- the metal mixture is subject to a temperature control in this structure conversion, so that undesirable solidification is avoided as possible.
- the metal mixture thus has on exit from the structure converter a dependent on the metallic material used temperature and will cool only in the second mold 17 and the subsequent vertically oriented - not shown - casting.
- the advantage of the method according to the invention consists in the fact that not only high-quality thixotropic metal alloys but also bolts with a diameter D> 12 cm can be cast therewith, without sacrificing quality, as in the case of known method is the case.
- the improved quality of the metal alloy not only reduces the reject rate but also the cost of subsequent product production.
- the inventive method is characterized by an increased production rate, which among other things also has an energy-saving result.
- FIGS. 1 . 2 and 3 described device and the method practicable with this device represent only a selection of several possible embodiments of the invention and can be changed in various ways.
- the various dimensions of the device 1 and their ratios can be varied depending on the metal alloy to be treated and the size of the bolt to be produced.
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Einrichtung zum Gießen einer thixotropen Metallegierung, nämlich ein Verfahren gemäss dem Oberbegriff des Anspruchs 1 und eine Einrichtung gemäss dem Oberbegriff des Anspruchs 3.The invention relates to a method and a device for casting a thixotropic metal alloy, namely a method according to the preamble of
Als Metallegierungen kommen hierbei insbesondere Aluminiumlegierungen in Frage, so zum Beispiel AlSiMg-Legierungen.As metal alloys in particular aluminum alloys come into question, such as AlSiMg alloys.
Zur Herstellung von Metallegierungen werden die Legierungskomponenten, wie etwa Aluminium, Silizium und Magnesium in einem Hochofen erhitzt und in flüssigem Zustand miteinander vermischt. Die so gebildete Metallmischung wird anschliessend mittels einer Förder- und/oder Pressvorrichtung in eine Giessvorrichtung geleitet, in welcher die Mischung dann zu Bolzen und dergleichen gegossen wird, so wie das in der Aluminiumindustrie allgemein bekannt ist.For the preparation of metal alloys, the alloying components such as aluminum, silicon and magnesium are heated in a blast furnace and mixed together in a liquid state. The metal mixture thus formed is then passed by means of a conveying and / or pressing device in a casting apparatus, in which the mixture is then cast into bolts and the like, as is well known in the aluminum industry.
Es sind schon mehrere Verfahren zur Herstellung von Metallegierungen bekannt, doch nur wenige, welche sich zur Herstellung von thixotropen Metallegierungen eignen.There are already several methods for the production of metal alloys known, but only a few, which are suitable for the production of thixotropic metal alloys.
Aus der
Aus der
Als thixotrop werden hierbei Metallegierungen bezeichnet, deren Viskosität unter dem Einfluss einer mechanischen Kraft abnimmt. Eine thixotrope Metallegierung ist insbesondere durch eine kugelige, globuläre Struktur gekennzeichnet. Zur Erzeugung dieser Struktur wird die flüssige Metallegierung beim Abkühlvorgang, also beim Übergang vom flüssigen in den festen Zustand, durch einen Strukturumwandler hindurchgeleitet und in diesem so einer Scherspannung ausgesetzt, dass sich die beim Vorerstarren bildenden festen Phasen, insbesondere aber die sich dabei bildenden Dendriten in kugelige, globuläre Teilchen mit einem einige zehn Mikrometer aufweisenden Durchmesser umwandeln.As thixotropic here metal alloys are referred to, whose viscosity decreases under the influence of a mechanical force. A thixotropic metal alloy is characterized in particular by a globular, globular structure. In order to produce this structure, the liquid metal alloy is passed through a structural converter during the cooling process, ie during the transition from the liquid to the solid state, and subjected to shear stress in such a way that the solid phases which form during pre-solidification, but in particular the dendrites which form during this process to convert spherical, globular particles with a diameter of a few tens of microns.
Mit den bekannten Verfahren zur Herstellung von Metallegierungen können die sich beim Erstarren der Legierung bildenden festen Phasen nicht vollständig in die gewünschte, globuläre Form transformiert werden. Auch lässt sich mit den bekannten Verfahren die Dendritenbildung weder unterdrücken noch hemmen, was für die Bildung von thixotropen Metallegierungen an sich von Vorteil wäre. Diese Verfahrensmängel führen nun dazu, dass es insbesondere bei der industriellen Fertigung praktisch nicht möglich ist, mit den bekannten Verfahren eine homogene, thixotrope Metallegierung herzustellen.With the known processes for the production of metal alloys, the solid phases which form upon solidification of the alloy can not be completely transformed into the desired, globular form. Nor can the dendrites be either suppressed or inhibited by the known methods, which would be advantageous for the formation of thixotropic metal alloys per se. These process defects now lead to the fact that it is practically impossible, in particular in industrial production, to produce a homogeneous, thixotropic metal alloy using the known processes.
Die der Erfindung zugrunde liegende Aufgabe besteht nun in der Schaffung eines Verfahrens und einer Einrichtung zur Herstellung von thixotropen Metallegierungen. Dabei wird insbesondere angestrebt, die Legierung während des Herstellungsprozesses in einem fliessfähigen Zustand zu halten, um dadurch ein Produkt zu erhalten, das eine möglichst homogene, globuläre Struktur aufweist. Beim Herstellen soll dementsprechend erreicht werden, dass dieses Produkt eben tatsächlich vollkommen thixotrop ist und zur Herstellung von Bolzen und dergleichen senkrecht oder horizontal in eine Giessvorrichtung ausgestossen werden kann.The object underlying the invention is now to provide a method and a device for the production of thixotropic metal alloys. In particular, the aim is to keep the alloy in a flowable state during the production process in order to obtain a product which has the most homogeneous globular structure possible. Accordingly, it should be achieved during manufacture that this product is in fact completely thixotropic and can be ejected vertically or horizontally into a casting device for producing bolts and the like.
Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Patentanspruchs 1 und einer Einrichtung mit den Merkmalen des Patentanspruchs 3 gelöst.This object is achieved by a method having the features of
Zur Herstellung von thixotropen Metallegierungen ist es insbesondere erforderlich, die zur Durchführung des Verfahrens im voraus einzustellenden Parameter wie etwa, Fördergeschwindigkeit, Druck und Temperatur abhängig von der verwendeten Metallmischung und den Dimensionen der nachfolgend noch im Detail beschriebenen Einrichtung aufeinander abzustimmen.For the production of thixotropic metal alloys, it is necessary, in particular, to set the parameters to be set in advance for carrying out the method, such as, conveying speed, Pressure and temperature depending on the metal mixture used and the dimensions of the device described below in more detail match.
Besonders vorteilhafte Ausgestaltungen des Verfahrens und der Einrichtung gehen aus den abhängigen Ansprüchen hervor.Particularly advantageous embodiments of the method and the device will become apparent from the dependent claims.
Bei der Ausgestaltung der Erfindung wird die fliessfähige Metallegierung in den zylindrischen Innenraum einer als Förder- und/oder Pressvorrichtung ausgebildeten Presse oder Pumpe eingebracht werden, welche eine zylindrische Kammer mit einem Einlass und einem Auslass besitzt. Im Innenraum der Kammer ist als mechanischer Förderer und/oder Rührer ein drehbarer Stabrührer angeordnet. Der Stabrührer besitzt in diesem Fall je ein im Auslass der zylindrischen Kammer sitzendes Ende, das erfindungsgemäss als Strukturumwandler ausgebildet ist und mindestens einen in Strömungsrichtung radial nach aussen gerichteten Durchgang besitzt, durch den die fliessfähige Metallegierung beim Betrieb der Einrichtung hindurch in eine Gießvorrichtung mit einem glockenartigen Innenraum gepresst wird.In the embodiment of the invention, the flowable metal alloy is introduced into the cylindrical interior of a press or pump designed as a conveying and / or pressing device, which has a cylindrical chamber with an inlet and an outlet. In the interior of the chamber, a rotatable rod stirrer is arranged as a mechanical conveyor and / or stirrer. The rod stirrer in this case has a respective end located in the outlet of the cylindrical chamber, which according to the invention is designed as a structural converter and has at least one radially outwardly directed passage in the flow direction, through which the flowable metal alloy passes during operation of the device into a casting device with a bell-like Interior is pressed.
Nachfolgend wird nun anhand der Zeichnung das Ausführungsbeispiel der Erfindung näher beschrieben. In der Zeichnung zeigt
- die
Figur 1 - die
Figur 2Figur 1 - die
Figur 3Figur 2
- the
FIG. 1 a schematic representation of a vertically oriented device for producing an aluminum alloy, - the
FIG. 2 a longitudinal section through the structural converter forming the end of the rod stirrer in theFIG. 1 illustrated device in an enlarged scale, and - the
FIG. 3 a cross section along the line III-III ofFIG. 2 ,
Die in der
Der Ausgang 4 der Zufuhrvorrichtung 2 ist über eine Dichtung 5 mit dem Einlass 6 einer Förder- und Pressvorrichtung 7 verbunden. Diese besitzt einen metallischen Mantel 8 und eine durch ein Graphitrohr 9 gebildete Kammer mit einer vertikalen Achse und einem Innenraum 10. Das Graphitrohr 9 kann abhängig von der zu behandelnden Metallegierung selbstverständlich auch aus einem anderen Material, so zum Beispiel aus einem keramischen Körper, gebildet sein.The
Durch den Innenraum 10 ist ein axialer Stabrührer 11 geführt, der mit einer ausserhalb der Förder- und Pressvorrichtung 7 angeordneten drehzahlverstellbaren - nicht gezeichneten - Antriebsvorrichtung verbunden ist. Der sich durch das Graphitrohr 9 erstreckende Stabrührer 11 ist im wesentlichen zweiteilig und besitzt einen zylindrischen Stab 12 und einen im Kammerauslass sitzenden und als Strukturumwandler dienenden Rotorkopf 13. Rotorkopf 13 und Stab 12 bestehen zum Beispiel aus Graphit, wobei der vorzugsweise mindestens zum Teil rohrartig ausgebildete Stab 13 dann noch zusätzlich einen metallischen Kern 14 besitzt.Through the
Das den Kammerauslass bildende untere Ende des Graphitrohres 9 mündet in den glockenartigen Innenraum 15 einer ersten Kokille 16. Diese zum Beispiel aus Monalit gebildete Kokille 16 sitzt auf einer zweiten, wassergekühlten Kokille 17 aus metallischem Material mit einem nicht im Detail gezeichneten Kühlwasserring 18.The bottom end of the
Der Rotorkopf 13 des Stabrührers 11 sitzt mit seinem oberen zylindrischen Abschnitt 13a satt passend im den Kammerauslass der Förder- und/oder Pressvorrichtung 7 bildenden Rohrendabschnitt 9a. Der untere zylindrische Abschnitt 13b liegt im Innenraum 15 der Kokille 16 und besitzt eine über den Abschnitt 13a hinausragende ringförmige Schulter, mit welcher er mit geringem Abstand unter das stirnseitige Ende des Rohres 9 zu liegen kommt. Der insbesondere als Strukturumwandler ausgebildete und an seinem Ende vorteilhafterweise zu einem Spitz 13c zulaufende Rotorkopf 13 besitzt schliesslich mehrere, beispielsweise vier, in Strömungsrichtung radial nach aussen gerichtete, die Innenräume 10 und 15 miteinander verbindende Durchgänge 19, so wie das in den
Der Stab 12 des Stabrührers 11 ist nun derart dimensioniert, dass sich der Querschnitt des Ringspaltes zwischen dem Stab 12 und dem Graphitrohr 9 vorzugsweise etwa 5 mm beträgt. Dadurch wird unter anderem das dendritische Wachstum während des nachfolgend noch näher erläuterten Abkühlprozesses weitgehend unterdrückt.The
Anzahl, Form und Grösse der Durchgänge 19 kann abhängig von der Grösse der Einrichtung und der zu behandelnden Metallegierung variieren. Vorzugsweise besitzt der Rotorkopf 13 mindestens vier gleichmässig über seinen Umfang verteilte Durchgänge 19.The number, shape and size of the
Beim Betrieb der Vorrichtung führt die Zufuhrvorrichtung 2 die von einem nicht gezeichneten Speicher aufgenommene flüssige AlSiMg-Metallmischung der Förder- und Pressvorrichtung 7 zu, und zwar mit einer Temperatur von beispielsweise 650°C bis 700°C. Die Zufuhr kann hierbei sowohl chargenweise als auch kontinuierlich erfolgen, sodass dann der nachfolgende Giessprozess wahlweise chargenweise oder kontinuierlich durchgeführt werden kann.During operation of the device, the
Durch die Schwerkraft, aber auch durch die Förderwirkung des Stabrührers 11 gelangt die Metallmischung zum Kammerauslass der Förder- und/oder Pressvorrichtung. Dabei kann sich die flüssige Metallmischung zu verfestigen beginnen und Dendriten bilden, welche ihrerseits durch eine verzweigte, baumartige Fadenstruktur gekennzeichnet sind. Diese Dendritenbildung wird nun aber beim erfindungsgemässen Verfahren bereits durch die Wirkung des sich drehenden Stabrührers 11 unterdrückt, sodass dadurch die Metallsuspension nahezu dendritenfrei gehalten werden kann.By gravity, but also by the conveying action of the
Die immer noch fliessfähige Metallmischung wird dann durch den als Strukturumwandler ausgebildeten Rotorkopf 13, das heisst durch dessen Durchgänge 19 hindurch geleitet, bzw. gestossen. Da sich nun der Rotorkopf 13 während des Betriebes fortlaufend dreht, wird das durch die Durchgänge 19 hindurchgeleitete Material radial bewegt und Zentrifugal gegen die Innenwand 16a der glockenartigen Kokille 16 gedrückt. Dadurch entstehen hohen Scherspannungen, durch welche gegebenenfalls noch vorhandene Dendriten aufgebrochen und in kugelige Teilchen zerlegt werden und die Dendriten-Neubildung verhindert wird.The still flowable metal mixture is then passed or pushed through the
Erfindungsgemäss unterliegt die Metallmischung bei dieser Strukturumwandlung weiterhin einer Temperaturkontrolle, so dass eine unerwünschte Erstarrung möglichst vermieden wird. Die Metallmischung besitzt also beim Austritt aus dem Strukturumwandler eine vom eingesetzten metallischen Material abhängige Temperatur und wird sich erst in der zweiten Kokille 17 und der anschliessenden vertikal ausgerichteten - nicht gezeichneten - Giessvorrichtung weiter abkühlen.According to the invention, the metal mixture is subject to a temperature control in this structure conversion, so that undesirable solidification is avoided as possible. The metal mixture thus has on exit from the structure converter a dependent on the metallic material used temperature and will cool only in the
Der Vorteil des erfindungsgemässen Verfahrens besteht nun darin, dass mit diesem nicht nur thixotrope Metallegierungen mit hoher Qualität, sondern auch Bolzen mit einem Durchmesser D > 12 cm gegossen werden können, und zwar ohne dabei eine Qualitätsminderung in Kauf zu nehmen, so wie das bei den bekannten Verfahren der Fall ist. Dazu kommt, dass die verbesserte Qualität der Metallegierung nicht nur die Ausschussrate sondern auch die Kosten der nachfolgenden Produkte-Erzeugung verringert. Schliesslich zeichnet sich das erfindungsgemässe Verfahren durch ein erhöhtes Produktionstempo aus, was unter anderem auch eine Energie-Einsparung zur Folge hat.The advantage of the method according to the invention consists in the fact that not only high-quality thixotropic metal alloys but also bolts with a diameter D> 12 cm can be cast therewith, without sacrificing quality, as in the case of known method is the case. In addition, the improved quality of the metal alloy not only reduces the reject rate but also the cost of subsequent product production. Finally, the inventive method is characterized by an increased production rate, which among other things also has an energy-saving result.
Es sei abschliessend noch darauf hingewiesen, dass die anhand der
So können die verschiedenen Abmessungen der Einrichtung 1 und deren Verhältnisse abhängig von der zu behandelnden Metallegierung und der Grösse der herzustellenden Bolzen variiert werden.Thus, the various dimensions of the
Claims (5)
- Metal casting process in which a thixotropic structure is produced in a metal alloy, wherein the alloy in the liquid state is introduced into a mechanical delivery device (7) having a cylindrical chamber (10), characterized in that the alloy is then pressed, under a high pressure generated by the delivery device, through a structure converter (13) that rotates about the axis of the chamber and forms the outlet of the delivery device, the alloy being conveyed through at least one passage (19) in the structure converter, directed radially outwards, by means of which, in order to destroy dendritic structures, the alloy is exposed to high shearing strain and accelerated centrifugally and enters a casting device (16, 17) located at the outlet of the delivery device, where it subsequently cools.
- Process according to Claim 1, characterized in that the alloy is conveyed through the inner chamber (10) and caused to rotate by means of a stirring rod (11).
- Equipment for carrying out the process according to Claim 1 or 2, with a cylindrical chamber (10) and feed means (2), in order to feed a flowable, liquid metal alloy into the chamber, a mechanical delivery device (7), formed of a rotatable stirrer, being located in the chamber, characterized in that a structure converter (13), rotatable about the axis of the chamber and having at least one passage (19) directed radially outwards, is located in the outlet of the chamber, which serves to accelerate the alloy centrifugally for the purpose of destroying dendritic structures and to convey it into a casting device (16, 17) located at the outlet of the delivery device (7), and in that the casting device has cooling means (18) for cooling the alloy.
- Equipment according to Claim 3, characterized in that the structure converter (13) has four passages (19) uniformly distributed in radial directions.
- Equipment according to Claim 3, characterized in that the structure converter is connected to the stirrer (11) of the delivery device (7) and is jointly driven thereby.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03405858A EP1537928B1 (en) | 2003-12-02 | 2003-12-02 | Method and apparatus for producing a thixotropic alloy |
| SI200331582T SI1537928T1 (en) | 2003-12-02 | 2003-12-02 | Method and apparatus for producing a thixotropic alloy |
| DE50311174T DE50311174D1 (en) | 2003-12-02 | 2003-12-02 | Method and device for producing a thixotropic metal alloy |
| AT03405858T ATE422402T1 (en) | 2003-12-02 | 2003-12-02 | METHOD AND DEVICE FOR PRODUCING A THIXOTROPIC METAL ALLOY |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03405858A EP1537928B1 (en) | 2003-12-02 | 2003-12-02 | Method and apparatus for producing a thixotropic alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1537928A1 EP1537928A1 (en) | 2005-06-08 |
| EP1537928B1 true EP1537928B1 (en) | 2009-02-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03405858A Expired - Lifetime EP1537928B1 (en) | 2003-12-02 | 2003-12-02 | Method and apparatus for producing a thixotropic alloy |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1537928B1 (en) |
| AT (1) | ATE422402T1 (en) |
| DE (1) | DE50311174D1 (en) |
| SI (1) | SI1537928T1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3902544A (en) * | 1974-07-10 | 1975-09-02 | Massachusetts Inst Technology | Continuous process for forming an alloy containing non-dendritic primary solids |
| EP0200424B1 (en) * | 1985-04-19 | 1989-07-19 | National Research Development Corporation | Metal forming |
-
2003
- 2003-12-02 SI SI200331582T patent/SI1537928T1/en unknown
- 2003-12-02 EP EP03405858A patent/EP1537928B1/en not_active Expired - Lifetime
- 2003-12-02 AT AT03405858T patent/ATE422402T1/en active
- 2003-12-02 DE DE50311174T patent/DE50311174D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP1537928A1 (en) | 2005-06-08 |
| ATE422402T1 (en) | 2009-02-15 |
| DE50311174D1 (en) | 2009-03-26 |
| SI1537928T1 (en) | 2009-08-31 |
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