EP1482062B1 - Procédé de moulage de mousse métallique et moule fermable de manière étanche pour la fabrication d'articles moulés - Google Patents

Procédé de moulage de mousse métallique et moule fermable de manière étanche pour la fabrication d'articles moulés Download PDF

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Publication number
EP1482062B1
EP1482062B1 EP03012037A EP03012037A EP1482062B1 EP 1482062 B1 EP1482062 B1 EP 1482062B1 EP 03012037 A EP03012037 A EP 03012037A EP 03012037 A EP03012037 A EP 03012037A EP 1482062 B1 EP1482062 B1 EP 1482062B1
Authority
EP
European Patent Office
Prior art keywords
casting method
melt
foam casting
gas
foam
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.)
Expired - Lifetime
Application number
EP03012037A
Other languages
German (de)
English (en)
Other versions
EP1482062A1 (fr
Inventor
Jochen Dipl.-Ing. Weber
Mirko Dipl.-Ing. Schaper
Friedrich-Wilhelm Prof. Dr.-Ing. Bach
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.)
Leibniz Universitaet Hannover
Original Assignee
Leibniz Universitaet Hannover
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 Leibniz Universitaet Hannover filed Critical Leibniz Universitaet Hannover
Priority to EP03012037A priority Critical patent/EP1482062B1/fr
Priority to AT03012037T priority patent/ATE331818T1/de
Priority to DE50304053T priority patent/DE50304053D1/de
Priority to US10/858,466 priority patent/US7174946B2/en
Publication of EP1482062A1 publication Critical patent/EP1482062A1/fr
Application granted granted Critical
Publication of EP1482062B1 publication Critical patent/EP1482062B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/005—Casting metal foams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/003—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using inert gases
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/08—Alloys with open or closed pores
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/08—Alloys with open or closed pores
    • C22C1/083—Foaming process in molten metal other than by powder metallurgy
    • C22C1/086—Gas foaming process

Definitions

  • the invention relates to a Schaumg foolclar for the production of components or foamed moldings and a pressure-tight sealable mold for the production of moldings.
  • the metal is conveyed by a piston at high speed under high pressure from the casting chamber in a multi-part metallic permanent mold, where it solidifies quickly due to the high heat dissipation.
  • the pressure is maintained during solidification. Cavities and undercuts are formed by fixed or movable cores or slides.
  • the chill casting process is a precision casting process, with which intricately shaped castings can be manufactured close to the final dimensions and with a high surface quality. Die castings are extremely dimensionally stable and have smooth, clean surfaces and edges, they require little mechanical processing.
  • a problematic feature of all known casting methods is the solidification process determined by the geometry, so that due to the increased heat dissipation, the near-surface region first solidifies, while there is still melt in the inner region. As a result, for example, pores and voids can arise. For this reason, die-cast parts in the production process are generally subjected to a random visual inspection and expediently also to a random quality test.
  • closed-cell or almost closed-cell foams can be realized.
  • Such a morphology is of interest for the mechanical properties and thus for structural applications such as, for example, lightweight construction elements in vehicle construction.
  • Functional applications such as heat exchangers, filters or mufflers require a predominantly open-pored structure to allow a fluid to penetrate or pass through the foam.
  • a gas is supplied to the melt by means of a lance immersed in the melt.
  • the melted material passed through with the gas is removed in the near-surface layers by means of a slide and is then rapidly cooled. In this way, in particular plate-shaped semi-finished products are produced, which can then be shaped into different components unformed.
  • the disadvantage here is the limited shaping possibilities. In particular, very fine structures can not be realized. In addition, the process is difficult to control. In practice, this leads in particular to an unequal distribution of the pores. The resulting reaction gases require additional safety precautions.
  • a likewise known method is the casting over of fillers with metallic melts. After removal of the fillers there is a sponge-like, open-pore body with interconnected pores. By selecting the fillers, the density and pore morphology can be varied within wide limits. The materials produced by this method, however, have residues of fillers.
  • a generic method is for example also already known from DE 101 04 340 A1, which describes a method for producing metal foam by adding a blowing agent to a molten metal, wherein the molten metal is introduced into a mold cavity and is foamed with a blowing agent.
  • the invention has for its object to improve Schaumg foolmaschineric such that the quality of the products produced thereby is substantially increased.
  • homogeneous material properties should be achieved.
  • a pressure-tight sealable mold for performing such methods is to be created.
  • the first object is achieved according to the invention with a Schaumg machine Kunststoffmaschinen according to the features of claim 1.
  • the subclaims relate to particularly expedient developments of the invention.
  • a foam casting process for the production of components or foamed moldings in which a gas is supplied to a molten metal which only partially fills a closed mold cavity until the internal pressure within the mold cavity exceeds the melt pressure curve such that a sudden solidification of the molten metal does not occur due to a cooling process , But by an increase in pressure of the acting on the molten metal gas.
  • the solidification of the molten metal is not initiated as in the prior art due to a cooling process, but by an increase in pressure of the fluid acting on the molten metal.
  • the solidification process is thereby largely independent of location and thus abruptly, so that the instantaneous state of the molten metal is shown almost unchanged in the solidified molten metal.
  • the molten metal does not have to be completely liquid for this purpose.
  • the heat of fusion can be removed after solidification at a constant pressure to below the solidus line. Due to the inflowing gas, the desired foaming is achieved at the same time, so that the metal foam completely fills the mold cavity and reaches a pressure increase which, when the melt pressure curve is exceeded, leads to solidification of the melt, including the gas bubbles forming the pores therein. The process is thus carried out with little effort and in a single operation.
  • volume flow of the inflowing gas in dependence of the desired distribution of the pores or the local Density distribution of the solidified melt is adjusted, so as to further reduce in this way, for example, the total weight of the components thus produced compared to the prior art.
  • the volume flow can be supplied differently controlled in different areas, the volume flow can be controlled or regulated time-dependent, so as to be able to adjust the nature of the pores in addition to their distribution.
  • reaction-neutral gas in particular inert gas
  • inert gas inert gas
  • the melt can contain all technically relevant metals and their alloys. However, it is particularly promising if the melt contains magnesium and / or aluminum as a constituent.
  • the Schaumg fool Kunststoffes a cavity of a component is filled.
  • the load capacity for example, the dimensional stability and the compressive strength can be significantly increased with little effort.
  • the high thermal stability of the metal foam proves to be a decisive advantage.
  • suitable aids it is also possible for such components to be foamed, the nature of which does not withstand the solidification pressure, if the component is externally loaded, for example by means of a fluid or the same gas, with a corresponding counter-pressure and is supported by a mold.
  • an embodiment has proven to be particularly useful in which by means of Schaumg foolvons multiple components are positively connected to each other. As a result, a highly resilient and easy to achieve connection is achieved, which can be used in practice in different areas.
  • the further object of the present invention to provide a pressure-tight sealable mold for performing such methods is inventively realized in that the mold for the production of moldings in the foam casting method is equipped with a plurality of inlet openings for a gas, thereby achieving a uniform flow through the melt to achieve to realize a homogeneous metal foam.
  • the gas serves to increase the pressure inside the closed or closed mold, thereby realizing an approximately isothermal solidification. The disadvantageous cooling process of slowly solidified melts is thereby avoided.
  • the inlet openings can be arranged spaced from one another according to the desired density distribution of the molded part, so as to be able to realize partially deviating properties of the molded part.
  • individual inlet openings are optionally designed to be closable or have an adjustable flow cross-section so as to be able to influence the volume flow in a suitable manner, for example also over time.
  • design of the mold according to the invention are also suitable, in which the inlet openings are arranged on a bottom surface and / or wall surface, in order thereby to be able to selectively realize the desired surface finish, in particular closed or open-pored products.
  • the mold can be designed as a lost shape, however, it proves to be particularly practical if the mold is designed to be closed for multiple use.
  • the mold has a receptacle for fixing an insert, wherein the insert has a relation to the melt higher melting point and is reliably connected by the foaming with the metal foam molding.
  • Such insert can beisleise a flange or a threaded receptacle that allows easy mounting of the molded part.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Continuous Casting (AREA)
  • Powder Metallurgy (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Claims (13)

  1. Procédé de moussage pour la réalisation d'éléments de construction ou pièces moulées alvéolaires, dans lequel, dans un métal en fusion, remplissant seulement partiellement une cavité de moulage fermée, on introduit un gaz jusqu'à ce que la pression interne à l'intérieur de la cavité de moulage soit supérieure à une courbe de pression de la coulée, de telle sorte qu'il se produit une solidification brusque du métal en fusion qui est due non pas à un processus de refroidissement, mais à une augmentation de pression du gaz agissant sur le métal en fusion.
  2. Procédé de moussage selon la revendication 1, caractérisé en ce que le métal en fusion solidifié est refroidi conformément à la courbe de pression de la coulée, de telle sorte qu'un nouveau ramollissement du métal en fusion solidifié est exclu.
  3. Procédé de moussage selon la revendication 1 ou 2, caractérisé en ce que le débit volumétrique du gaz entrant est réglé en fonction de la répartition souhaitée des pores, plus précisément de la répartition locale de la densité de la coulée solidifiée.
  4. Procédé de moussage selon au moins l'une quelconque des revendications 1 à 3, caractérisé en ce que le gaz utilisé est un gaz à réaction neutre par rapport au métal en fusion, en particulier un gaz inerte.
  5. Procédé de moussage selon au moins l'une quelconque des revendications 1 à 4, caractérisé en ce que le métal en fusion contient du magnésium et/ou de l'aluminium en tant que constituant.
  6. Procédé de moussage selon au moins l'une quelconque des revendications 1 à 5, caractérisé en ce qu'une cavité dans un élément de construction est remplie au moyen du procédé de moussage.
  7. Procédé de moussage selon au moins l'une quelconque des revendications 1 à 6, caractérisé en ce que plusieurs éléments de construction sont assemblés les uns aux autres par adhérence au moyen du procédé de moussage.
  8. Moule apte à être fermé de manière étanche à la pression pour la réalisation de pièces moulées conformément au procédé selon au moins l'une quelconque des revendications 1 à 7, caractérisé en ce que le moule pour la réalisation de pièces moulées par le procédé de moussage comporte plusieurs orifices d'admission pour un gaz.
  9. Moule selon la revendication 8, caractérisé en ce que les orifices d'admission sont espacés les uns des autres en fonction de la répartition de densité souhaitée.
  10. Moule selon au moins l'une quelconque des revendications 8 à 9, caractérisé en ce que différents orifices parmi tous les orifices d'admission peuvent être fermés au choix.
  11. Moule selon au moins l'une quelconque des revendications 8 à 10, caractérisé en ce que les orifices d'admission sont ménagés sur une surface du fond et/ou sur des surfaces de paroi.
  12. Moule selon au moins l'une quelconque des revendications 8 à 11, caractérisé en ce que le moule est réalisé de manière refermable pour une utilisation répétée.
  13. Moule selon au moins l'une quelconque des revendications 8 à 12, caractérisé en ce que le moule comporte un logement destiné à la fixation d'un insert.
EP03012037A 2003-05-28 2003-05-28 Procédé de moulage de mousse métallique et moule fermable de manière étanche pour la fabrication d'articles moulés Expired - Lifetime EP1482062B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP03012037A EP1482062B1 (fr) 2003-05-28 2003-05-28 Procédé de moulage de mousse métallique et moule fermable de manière étanche pour la fabrication d'articles moulés
AT03012037T ATE331818T1 (de) 2003-05-28 2003-05-28 Schaumgiessverfahren sowie eine druckdicht verschliessbare giessform zur herstellung von formteilen
DE50304053T DE50304053D1 (de) 2003-05-28 2003-05-28 Schaumgiessverfahren sowie eine druckdicht verschliessbare Giessform zur Herstellung von Formteilen
US10/858,466 US7174946B2 (en) 2003-05-28 2004-06-02 Chill casting process and foam casting process as well as a pressure tight closable casting mold for manufacture of form parts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03012037A EP1482062B1 (fr) 2003-05-28 2003-05-28 Procédé de moulage de mousse métallique et moule fermable de manière étanche pour la fabrication d'articles moulés

Publications (2)

Publication Number Publication Date
EP1482062A1 EP1482062A1 (fr) 2004-12-01
EP1482062B1 true EP1482062B1 (fr) 2006-06-28

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ID=33104101

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Application Number Title Priority Date Filing Date
EP03012037A Expired - Lifetime EP1482062B1 (fr) 2003-05-28 2003-05-28 Procédé de moulage de mousse métallique et moule fermable de manière étanche pour la fabrication d'articles moulés

Country Status (4)

Country Link
US (1) US7174946B2 (fr)
EP (1) EP1482062B1 (fr)
AT (1) ATE331818T1 (fr)
DE (1) DE50304053D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005037116B3 (de) * 2005-08-03 2007-01-18 Kunststoff-Prof. Ehrenstein GbR (vertretungsberechtigter Gesellschafter: Prof. Dr.-Ing. Dr.h.c. Gottfried W. Ehrenstein, 90427 Nürnberg) Verfahren zur Herstellung eines Formteils, insbesondere Spritzgießverfahren
CN110893453B (zh) * 2019-12-02 2024-02-27 中北大学 一种镁合金铸件石膏型精密铸造方法和装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5260222A (en) * 1975-09-30 1977-05-18 Honda Motor Co Ltd Method of manufacturing fibre reinforced composite
JPS57155336A (en) * 1981-03-20 1982-09-25 Honda Motor Co Ltd Production of fiber-reinforced composite body
DE4326982C1 (de) * 1993-08-11 1995-02-09 Alcan Gmbh Verfahren und Vorrichtung zur Herstellung von Formteilen aus Metallschaum
DE10104340A1 (de) * 2001-02-01 2002-08-08 Goldschmidt Ag Th Verfahren zur Herstellung von Mettalschaum und danach hergestellter Metallkörper
AT410103B (de) * 2001-06-15 2003-02-25 Huette Klein Reichenbach Gmbh Verfahren zur herstellung eines leichtgewichtigen formkörpers und formkörper aus metallschaum
EP1417063B2 (fr) * 2001-08-17 2012-08-08 Cymat Technologies Ltd. Procede de moulage de mousse de metal a basse pression

Also Published As

Publication number Publication date
DE50304053D1 (de) 2006-08-10
US7174946B2 (en) 2007-02-13
ATE331818T1 (de) 2006-07-15
EP1482062A1 (fr) 2004-12-01
US20050034836A1 (en) 2005-02-17

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