EP0980730A1 - Process for producing shaped articles from thixotropic metal alloys - Google Patents

Process for producing shaped articles from thixotropic metal alloys Download PDF

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Publication number
EP0980730A1
EP0980730A1 EP99113827A EP99113827A EP0980730A1 EP 0980730 A1 EP0980730 A1 EP 0980730A1 EP 99113827 A EP99113827 A EP 99113827A EP 99113827 A EP99113827 A EP 99113827A EP 0980730 A1 EP0980730 A1 EP 0980730A1
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EP
European Patent Office
Prior art keywords
blank
thixotropic
pressing force
temperature
molded part
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.)
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Application number
EP99113827A
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German (de)
French (fr)
Inventor
Werner Dr. Fritz
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.)
Schuler SMG GmbH and Co KG
Original Assignee
Schuler SMG GmbH and Co KG
Schuler Hydrap GmbH and Co KG
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 Schuler SMG GmbH and Co KG, Schuler Hydrap GmbH and Co KG filed Critical Schuler SMG GmbH and Co KG
Publication of EP0980730A1 publication Critical patent/EP0980730A1/en
Withdrawn legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging

Definitions

  • the invention relates to a method for producing Molded parts made of thixotropic metal alloys by the Alloy melted into the thixotropic structure, the thixotropic melt in one continuous casting process Continuous casting is formed from the continuous casting blanks are generated and each blank is used for forming necessary temperature is heated and then to the molded part is reshaped.
  • Thixotropic metal alloys are becoming increasingly important. They are defined by melting the metal and a Temperature control with simultaneous agitation receive. The thixotropic structure is characterized by this from that in a certain temperature range in a eutectic melt globular grains are present. At Solidification of such a melt remains the globular one Structure preserved, making it look normal molten and cast metal significantly higher Strengths result. This results in the increasing Importance of thixotropic aluminum alloys. The semi-finished products made from them are usually strangus profiles.
  • the invention has for its object a method for the production of molded parts from thixotropic metal alloys, especially aluminum alloys to propose that the production of almost any molded parts allowed with perfect structure quality.
  • this object is achieved in that the Continuous casting profile formed into plate-shaped rolling stock the rolled blanks with one configuration and one Volume punched out close to that of the Molding lie, and that the single blank after Warm up to a temperature at which the thixotropic Set state by press forging in one mold is formed into a molded part, at the same time the The melt portion solidifies.
  • the blank needs only heated to such a temperature that the subsequent one Press forging allowed. While the conventional Cast aluminum alloys at a melting temperature of 750 ° C, when die casting a thixotropic Alloy of about 700 ° C is necessary a thixotropic aluminum alloy already at 580 ° C by forging. Are correspondingly lower the need for thermal energy and that released into the environment Heat loss. This also shows through press forging manufactured molded part a high structural strength. The Material loss can occur through appropriate shaping of the punched blank can be minimized. The molding geometry are not due to the high formability set narrow limits in conventional press forging given are.
  • the blank should be heated to a temperature in the molten phase at least about 40 up to 60% solids are present.
  • the invention also allows Processing of blanks with a solid content of greater than 60%, so that the structural change when warming up is minimized.
  • the forming speed In the forming process according to the invention is first important that the blank at the beginning of the forming process too high impulsive forces are not applied to to prevent displacement of the melt component. Then the forming speed must be followed increase sharply progressively, while maintaining the thixotropic Structure to reach the final shape quickly. In front The forming speed must reach the final shape in turn, can be reduced sharply in order to reduce the Closing of the mold and increasing press force at the same time avoid excessive pressure peaks. Finally the final pressing force is held until the Liquid portion has solidified.
  • the maximum forming speed is preferably more than 800mm / s.
  • the maximum pressing force at the end of the Forming process is based on the degree of mold filling, the degree of deformation and the component geometry. You can up to be about 5000 kN.

Abstract

Continuously cast billets are converted into rolled plate material. Blanks with a volume and a configuration approaching those of the proposed shaped components are produced from such a plate. Heated to a temperature at which thixotropic state sets in, the blanks are provided with their final shape by press forging, with the liquid constituent of the material solidifying at the same time.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Formteilen aus thixotropen Metall-Legierungen, indem die Legierung in die thixotrope Struktur umgeschmolzen, die thixotrope Schmelze im Stranggießverfahren zu einem Strangguß geformt wird, aus dem Stranggußprofil Rohlinge erzeugt werden und jeder Rohling auf die für das Umformen notwendige Temperatur erwärmt und anschließend zum Formteil umgeformt wird.The invention relates to a method for producing Molded parts made of thixotropic metal alloys by the Alloy melted into the thixotropic structure, the thixotropic melt in one continuous casting process Continuous casting is formed from the continuous casting blanks are generated and each blank is used for forming necessary temperature is heated and then to the molded part is reshaped.

Thixotrope Metall-Legierungen, insbesondere thixotrope Aluminium-Legierungen gewinnen zunehmend an Bedeutung. Sie werden durch Erschmelzen des Metalls und eine definierte Temperaturführung bei gleichzeitiger Agitation erhalten. Die thixotrope Struktur zeichnet sich dadurch aus, daß in einem bestimmten Temperaturbereich in einer eutektischen Schmelze globulare Körner vorliegen. Bei Erstarren einer solchen Schmelze bleibt die globulare Struktur erhalten, wodurch sich gegenüber dem normal erschmolzenen und gegossenen Metall erheblich höhere Festigkeiten ergeben. Hieraus resultiert die zunehmende Bedeutung der thixotropen Aluminium-Legierungen. Die hieraus hergestellten Halbzeuge sind in der Regel Strangusprofile.Thixotropic metal alloys, especially thixotropic ones Aluminum alloys are becoming increasingly important. They are defined by melting the metal and a Temperature control with simultaneous agitation receive. The thixotropic structure is characterized by this from that in a certain temperature range in a eutectic melt globular grains are present. At Solidification of such a melt remains the globular one Structure preserved, making it look normal molten and cast metal significantly higher Strengths result. This results in the increasing Importance of thixotropic aluminum alloys. The semi-finished products made from them are usually strangus profiles.

Zur Herstellung von Formteilen aus dem Strangußprofil steht bisher im wesentlichen nur ein Verfahren zur Verfügung, nämlich das Druckgießen. Aus dem Strangußprofil wird ein Rohling abgelängt, der in einer Ofenanlage in einem gesteuerten Temperaturprozeß langsam erwärmt wird. Am Ende der Erwärmungsphase muß eine Struktur erhalten werden, die einen Festkörperanteil von 40% bis maximal 60% und einen entsprechenden Schmelzeanteil aufweist. Dieser Rohling hat eine teigige Struktur, die gerade noch seine Handhabung ermöglicht. Der teigige Rohling wird in eine Vorkammer eines Druckgießwerkzeugs eingelegt, mit hohem Druck beaufschlagt und dabei die teigige Masse in die Form verdrängt. Um eine einwandfreie Formfüllung zu erhalten, muß mit bedeutsamen Überschußmengen bei gleichzeitigem Nachpressen gearbeitet werden. Die Überschußmengen werden in Überlaufsystemen am Werkzeug aufgenommen.For the production of molded parts from the extruded profile so far essentially only one method is available, namely die casting. From the continuous cast profile a blank is cut to length, which is placed in a furnace in is slowly heated in a controlled temperature process. A structure must be preserved at the end of the heating phase that have a solid content of 40% to maximum 60% and has a corresponding melt content. This blank has a doughy structure that just barely its handling enables. The doughy blank is in a pre-chamber of a die casting tool inserted with high pressure and the doughy mass in the form displaces. To ensure perfect mold filling must be obtained with significant excess quantities at the same time Postpressing can be worked. The excess quantities are taken up in overflow systems on the tool.

Dieses bekannte Verfahren hat aufgrund der begrenzten Fließwege, die im wesentlichen durch den Flüssiganteil bestimmt sind, relativ enge Grenzen in der Formteilgeometrie. Ferner wird auch bei entsprechendem Nachpressen keine endgültig verfestigte Gefügequalität erreicht.This known method has due to the limited Flow paths essentially through the liquid portion are determined, relatively narrow limits in the part geometry. Furthermore, with appropriate re-pressing no final solidified structure quality achieved.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung von Formteilen aus thixotropen Metall-Legierungen, insbesondere Aluminium-Legierungen, vorzuschlagen, das die Herstellung annähernd beliebiger Formteile bei einwandfreier Gefügequalität gestattet.The invention has for its object a method for the production of molded parts from thixotropic metal alloys, especially aluminum alloys to propose that the production of almost any molded parts allowed with perfect structure quality.

Ausgehend von dem Verfahren gemäß dem Oberbegriff des Anspruchs 1 wird diese Aufgabe dadurch gelöst, daß das Stranggußprofil zu plattenförmigem Walzgut umgeformt, aus dem Walzgut Rohlinge mit einer Konfiguration und einem Volumen ausgestanzt werden, die nahe denjenigen des Formteils liegen, und daß der einzelne Rohling nach Aufwärmen auf eine Temperatur, bei der sich der thixotrope Zustand einstellt, durch Preßschmieden in einer Form zum Formteil umgeformt wird, wobei gleichzeitig der Schmelzeanteil erstarrt.Based on the method according to the preamble of Claim 1 this object is achieved in that the Continuous casting profile formed into plate-shaped rolling stock the rolled blanks with one configuration and one Volume punched out close to that of the Molding lie, and that the single blank after Warm up to a temperature at which the thixotropic Set state by press forging in one mold is formed into a molded part, at the same time the The melt portion solidifies.

Bei dem erfindungsgemäßen Verfahren braucht der Rohling nur auf eine solche Temperatur erwärmt, die das anschließende Preßschmieden erlaubt. Während beim herkömmlichen Gießen von Aluminium-Legierungen eine Schmelztemperatur von 750°C, beim Druckgießen einer thixotropen Legierung eine solche von ca. 700°C notwendig ist, läßt sich eine thixotrope Aluminiumlegierung schon bei 580°C durch Preßschmieden umformen. Entsprechend geringer sind der Bedarf an Wärmeenergie und die an die Umgebung abgebenen Wärmeverluste. Ferner zeigt das durch Preßschmieden hergestellte Formteil eine hohe Gefügefestigkeit. Die Materialverluste können durch entsprechende Formgebung des gestanzten Rohlings minimiert werden. Der Formteilgeometrie sind aufgrund der hohen Umformbarkeit nicht die engen Grenzen gesetzt, die beim herkömmlichen Preßschmieden gegeben sind.In the process according to the invention, the blank needs only heated to such a temperature that the subsequent one Press forging allowed. While the conventional Cast aluminum alloys at a melting temperature of 750 ° C, when die casting a thixotropic Alloy of about 700 ° C is necessary a thixotropic aluminum alloy already at 580 ° C by forging. Are correspondingly lower the need for thermal energy and that released into the environment Heat loss. This also shows through press forging manufactured molded part a high structural strength. The Material loss can occur through appropriate shaping of the punched blank can be minimized. The molding geometry are not due to the high formability set narrow limits in conventional press forging given are.

Der Rohling sollte auf eine Temperatur erwärmt werden, bei der in der schmelzflüssigen Phase wenigstens ca. 40 bis 60% Festkörperanteil vorhanden sind. Das erfindungsgemäße Verfahren gestattet insbesondere auch noch die Verarbeitung von Rohlingen mit einem Festkörperanteil von größer 60%, so daß die Gefügeumwandlung beim Aufwärmen minimiert wird. The blank should be heated to a temperature in the molten phase at least about 40 up to 60% solids are present. The invention In particular, the method also allows Processing of blanks with a solid content of greater than 60%, so that the structural change when warming up is minimized.

In bevorzugter Ausführung des Verfahrens wird der Rohling zu Beginn des Einwirkens der Preßkraft mit geringer, dann mit einer progessiv steigenden Umformgeschwindigkeit bis zu größer 500mm/s und kurz vor Erreichen der Endform des Formteils mit stark degressiver Umformgeschwindigkeit bei stark progressiver Preßkraft umgeformt, wobei die Preßkraft bis zum Erstarren des Flüssiganteils gehalten wird.In a preferred embodiment of the method, the blank at the beginning of the action of the pressing force with low, then with a progressively increasing forming speed up to to greater than 500mm / s and shortly before reaching the final shape of the Molded parts with strongly degressive forming speed strongly progressive pressing force reshaped, the pressing force is held until the liquid portion solidifies.

Bei dem erfindungsgemäßen Umformverfahren ist zunächst wichtig, daß der Rohling zu Beginn des Umformvorgangs nicht mit zu hohen Impulskräften beaufschlagt wird, um ein Verdrängen Auswandern des Schmelzeanteils zu vermeiden. Anschließend muß aber die Umformgeschwindigkeit stark progressiv ansteigen, um unter Wahrung der thixotropen Struktur schnell die Endform zu erreichen. Vor Erreichen der Endform muß die Umformgeschwindigkeit wiederum stark degressiv abgesenkt werden, um beim Schließen der Form und gleichzeitig ansteigender Preßkraft überschwingende Druckspitzen zu vermeiden. Schließlich wird die End-Preßkraft solange gehalten, bis der Flüssiganteil erstarrt ist.In the forming process according to the invention is first important that the blank at the beginning of the forming process too high impulsive forces are not applied to to prevent displacement of the melt component. Then the forming speed must be followed increase sharply progressively, while maintaining the thixotropic Structure to reach the final shape quickly. In front The forming speed must reach the final shape in turn, can be reduced sharply in order to reduce the Closing of the mold and increasing press force at the same time avoid excessive pressure peaks. Finally the final pressing force is held until the Liquid portion has solidified.

Vorzugsweise beträgt die maximale Umformgeschwindigkeit mehr als 800mm/s. Die maximale Preßkraft am Ende des Umformvorgangs wird von dem Formfüllungsgrad, dem Umformgrad und der Bauteilgeometrie bestimmt. Sie kann bis zu etwa 5000 kN betragen.The maximum forming speed is preferably more than 800mm / s. The maximum pressing force at the end of the Forming process is based on the degree of mold filling, the degree of deformation and the component geometry. You can up to be about 5000 kN.

Für die Erzeugung des platinenförmigen Rohlings aus dem Walzgut kommen alle herkömmlichen Verfahren in Frage, wobei insbesondere das Schneiden, Stanzen oder Zerspanen zu nennen sind.For the production of the blank blank from the All conventional processes can be rolled, in particular the cutting, punching or machining are to be mentioned.

Claims (6)

Verfahren zur Herstellung von Formteilen aus thixotropen Metall-Legierungen, indem die Legierung in die thixotrope Struktur umgeschmolzen, die thixotrope Schmelze im Stranggießverfahren zu einem Stranggußprofil geformt, aus dem Stranggußprofil Rohlinge erzeugt werden und jeder Rohling auf die für das Umformen notwendige Temperatur erwärmt und anschließend zum Formteil umgeformt wird, dadurch gekennzeichnet, daß das Stranggußprofil zu plattenförmigem Walzgut umgeformt, aus dem Walzgut Rohlinge mit einer Konfiguration und einem Volumen hergestellt werden, die nahe demjenigen des Formteils liegen, und daß der einzelne Rohling nach Aufwärmen auf eine Temperatur, bei der sich der thixotrope Zustand einstellt, durch Preßschmieden in einer Form zum Formteil umgeformt wird, wobei gleichzeitig der Flüssiganteil erstarrt. Process for the production of molded parts from thixotropic Metal alloys by adding the alloy in the thixotropic structure remelted, the thixotropic Melt in a continuous casting process to a continuous casting profile shaped, from the continuous cast profile blanks are generated and each blank on the for that Forming necessary temperature and then heated is formed into a molded part, thereby characterized in that the continuous casting profile to plate-shaped Rolled stock formed from the rolled stock blanks made with a configuration and volume be close to that of the molding lie, and that the single blank after warming up to a temperature at which the thixotropic Set state by press forging in one mold is formed into a molded part, at the same time the Liquid portion solidifies. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Rohling auf eine Temperatur erwärmt wird, bei der in der schmelzflüssigen Phase ca. 40 bis über 60% Festkörperanteil vorhanden ist.A method according to claim 1, characterized in that the blank is heated to a temperature in the molten phase about 40 to there is more than 60% solids. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Rohling auf eine Temperatur erwärmt wird, bei der in der schmelzflüssigen Phase wenigstens 60% Festkörperanteil vorhanden sind.A method according to claim 1 or 2, characterized in that that the blank is heated to a temperature is in the molten phase at least 60% solids are present. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Rohling zu Beginn des Einwirkens der Preßkraft mit geringer, dann mit einer progressiv steigenden Umformgeschwindigkeit bis zu größer 500mm/s und kurz vor Erreichen der Endform des Formteils mit stark degressiver Umformgeschwindigkeit bei stark progessiver Preßkraft umgeformt wird, wobei die Preßkraft bis zum Erstarren des Flüssiganteils gehalten wird.Method according to one of claims 1 to 3, characterized characterized in that the blank at the beginning of the action the pressing force with less, then with one progressively increasing forming speed up to greater than 500mm / s and shortly before reaching the final shape of the molded part with a strongly degressive forming speed formed with a strongly progressive pressing force is, the pressing force until the solidification of the Liquid portion is held. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der Rohling nach Einwirken der Preßkraft mit einer Umformgeschwindigkeit von etwa 800mm/s umgeformt wird.A method according to claim 2, characterized in that the blank with after the pressing force a forming speed of about 800mm / s becomes. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß das Formteil bei Erreichen der Endform mit einer Preßkraft, die für eine eventuelle Restumformung erforderlich ist, beaufschlagt wird.A method according to claim 4 or 5, characterized in that that the molded part when reaching the final shape with a pressing force, which is necessary for any residual forming is required is applied.
EP99113827A 1998-08-14 1999-07-15 Process for producing shaped articles from thixotropic metal alloys Withdrawn EP0980730A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19836883 1998-08-14
DE19836883A DE19836883A1 (en) 1998-08-14 1998-08-14 Process for the production of molded parts from thixotropic metal alloys

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EP0980730A1 true EP0980730A1 (en) 2000-02-23

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EP99113827A Withdrawn EP0980730A1 (en) 1998-08-14 1999-07-15 Process for producing shaped articles from thixotropic metal alloys

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JP (1) JP2000071054A (en)
KR (1) KR20000017300A (en)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8464777B2 (en) 2005-07-19 2013-06-18 Cummins Turbo Technologies Limited Method and apparatus for manufacturing turbine or compressor wheels
CN108246998A (en) * 2018-01-30 2018-07-06 昆明理工大学 A kind of preparation method of semi-solid squeeze casting shaft sleeve parts

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177086A (en) * 1977-03-31 1979-12-04 Societe Pour Le Forgeage Et L'estampage Des Alliages Legers Forgeal Process for the thermal treatment and the quenching of forged articles
US4594117A (en) * 1982-01-06 1986-06-10 Olin Corporation Copper base alloy for forging from a semi-solid slurry condition
US5282910A (en) * 1991-06-10 1994-02-01 Alusuisse-Lonza Services Ltd. Process for heating a metal alloy workpiece
EP0816042A1 (en) * 1996-07-03 1998-01-07 GUIDO BAGGIOLI S.N.C. DI BAGGIOLI GIUSEPPE & PELLEGRINI CLEMENTINA A process for manufacturing alloy castings

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3502675A1 (en) * 1985-01-26 1986-07-31 Alfred Teves Gmbh, 6000 Frankfurt Method for the compression moulding of a moulding

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177086A (en) * 1977-03-31 1979-12-04 Societe Pour Le Forgeage Et L'estampage Des Alliages Legers Forgeal Process for the thermal treatment and the quenching of forged articles
US4594117A (en) * 1982-01-06 1986-06-10 Olin Corporation Copper base alloy for forging from a semi-solid slurry condition
US5282910A (en) * 1991-06-10 1994-02-01 Alusuisse-Lonza Services Ltd. Process for heating a metal alloy workpiece
EP0816042A1 (en) * 1996-07-03 1998-01-07 GUIDO BAGGIOLI S.N.C. DI BAGGIOLI GIUSEPPE & PELLEGRINI CLEMENTINA A process for manufacturing alloy castings

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8464777B2 (en) 2005-07-19 2013-06-18 Cummins Turbo Technologies Limited Method and apparatus for manufacturing turbine or compressor wheels
CN108246998A (en) * 2018-01-30 2018-07-06 昆明理工大学 A kind of preparation method of semi-solid squeeze casting shaft sleeve parts
CN108246998B (en) * 2018-01-30 2020-02-07 昆明理工大学 Preparation method of semi-solid extrusion casting shaft sleeve part

Also Published As

Publication number Publication date
DE19836883A1 (en) 2000-02-17
JP2000071054A (en) 2000-03-07
KR20000017300A (en) 2000-03-25

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