EP1000690B1 - Procédé de préparation d'un produit semi-fini moussable ainsi que d un produit semi-fini - Google Patents

Procédé de préparation d'un produit semi-fini moussable ainsi que d un produit semi-fini Download PDF

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Publication number
EP1000690B1
EP1000690B1 EP99122624A EP99122624A EP1000690B1 EP 1000690 B1 EP1000690 B1 EP 1000690B1 EP 99122624 A EP99122624 A EP 99122624A EP 99122624 A EP99122624 A EP 99122624A EP 1000690 B1 EP1000690 B1 EP 1000690B1
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EP
European Patent Office
Prior art keywords
pressing
semi
pored
mixture
open
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
EP99122624A
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German (de)
English (en)
Other versions
EP1000690A3 (fr
EP1000690A2 (fr
Inventor
Frank Baumgärtner
Henri Dr. Cohrt
Dieter Dr. Brungs
Horst Gers
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.)
Schunk Sintermetalltechnik GmbH
Original Assignee
Schunk Sintermetalltechnik GmbH
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Publication date
Application filed by Schunk Sintermetalltechnik GmbH filed Critical Schunk Sintermetalltechnik GmbH
Publication of EP1000690A2 publication Critical patent/EP1000690A2/fr
Publication of EP1000690A3 publication Critical patent/EP1000690A3/fr
Application granted granted Critical
Publication of EP1000690B1 publication Critical patent/EP1000690B1/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
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
    • B22F7/004—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature comprising at least one non-porous part
    • B22F7/006—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature comprising at least one non-porous part the porous part being obtained by foaming

Definitions

  • the invention relates to a method for producing a metallic composite material. Furthermore, the invention relates to a semi-finished product intended for a metallic Composite body, wherein the semi-finished product from at least one of at least one metal powder and at least one pellet made of gas-releasing propellant powder and there is an associated cover layer.
  • a metallic composite material is known from DE 44 26 627 C2.
  • a foamable core is produced by compression by means of pressure and temperature effects of a mixture of at least one metal powder and at least one gas-releasing blowing agent powder.
  • the core produced by compressing the mixture is closed-pore, so that foaming takes place when the temperature is specifically influenced.
  • a package having a sandwich structure is produced by cold or hot rolling or diffusion welding, which creates an intimate connection between the cover layer and the core.
  • the resulting composite is then shaped by pressing, bending or deep drawing, in order to then foam up the core by thermal action.
  • DE 41 24 491 C1 is a process for the production of foamable metal bodies to be removed by rolling.
  • a powder mixture of at least one powder containing blowing agent and a metal powder without external temperature increase cold pressed.
  • the pressure is selected so that the blowing agent particles from the Metal powder particles are tightly encased so that they can be preheated afterwards do not release gas from the material.
  • a foamable core of a metallic composite material proposed, with gas-releasing propellant particles between metal particles be included to prevent propellant gas from being compressed prematurely Core exits.
  • the core is compacted by hot compacting.
  • DE 196 12 781 C1 shows a component made of metallic foam material.
  • a foamable compact is produced, which is compacted and solidified Mixture of metal powder and blowing agent.
  • the pellet at least provided on one side with a solid metal sheet, in order then in Form composite and by heat treatment the metal powder containing the blowing agent froth.
  • the DE-Z .: Ingenieur Werkstoffe, No. 3 (1998) pp. 42 - 45 is a manufacturing process of components made of aluminum foams, first of all a mixture of Blowing agent, aluminum powder and additives are cold isostatically pressed to a theoretical To achieve density of about 70 to 80% of the base material. Then it will be like this The body obtained is reshaped using extrusion technology to create an almost 100% gas-tight, so to produce closed-pore compact. This is then, for example, with aluminum or sheet steel and then foamed to a desired one Obtain component made of aluminum foam.
  • the present invention is based on the problem of a method and a semi-finished product of the type mentioned in the introduction so that there is a procedural simplification in the manufacture of metallic composite materials, in particular the possibility is to be created, metal body of almost any dimensions available to deliver.
  • a semi-finished product is intended for a metallic composite body, the semi-finished product consisting of at least one of at least one metal powder and at least one gas-releasing one Propellant powder produced compact and cover layer connected thereto, is characterized by the fact that the compact is open-pore.
  • blowing agents in the mixture are conventional blowing agents, such as metal hydrides such as B. titanium hydride or carbonates such.
  • Metals that can be used as cover layers are, for example, also part of the mixture are or outer layers of aluminum or steel.
  • a powder mixture of aluminum powder and 12% by weight silicon powder and 0.8% by weight Titanium hydride powder is transformed into pressed bars (cuboids) with cuboid shapes by cold isostatic pressing Dimensions pressed.
  • This precompacted open-pore ingot is then between two aluminum sheet strips guided along pressure rollers were introduced, the Pressure rollers apply pressure over the metal strips to the precompacted powder mixture exercise.
  • the temperature during rolling is 400 ° C.
  • the composite thus produced with a total thickness of 4.2 mm, was preheated Foamed oven.
  • the thickness of the sandwich sheet produced in this way The aluminum base was approx. 16 mm after the foaming process.
  • a process sequence for producing a metallic composite body is 1.
  • metal powder such as aluminum powder with titanium hydride powder mixed as blowing agent powder
  • the proportion of the titanium hydride powder approximately Is 0.8% by weight.
  • an open-pore compact is made manufactured. Isostatic or axial pressing cuboid or plate-shaped body. Then one can from the compact Body of the desired geometry can be cut out or the compact itself can be used be, the open-pore compact or the open-pore body to a composite produced by placing one or more cover layers or inserting them in a frame can then be intimately connected to the composite as a unit by rolling on the one hand and on the other hand to reshape the composite compact and cover layer, which can be called semi-finished product, in such a way that the Blowing agent particles are trapped between the metal particles (process step 16). In the usual way, the network can then by z. B.
  • FIG. 2 shows an open-pore 22, the compact on the circumference of a frame 24 and is surrounded on the bottom and top by plates 26, 28.
  • the bottom and top plate 26, 28 are e.g. B. by gluing, welding or mechanical joining with the frame 24th connected to in the subsequent rolling process in accordance with method step 16 ensure that the plates 26, 28 and the frame 24 surrounding the compact 22 cannot be moved towards each other.
  • Both the frame and the plates 26, 28 can consist of metal such as aluminum or steel.
  • the use of the frame 24 is advantageous since the compact 22 can be quite brittle, so that in the method step rolling, in which the compact 22 becomes a foamable and so that closed-pore core is compressed, the compact 22 does not break.
  • FIG. 3 shows a further preferred embodiment for producing a metallic one Composite shown.
  • compacts 30, 32, 34, 36 between the bottom and Head plates 38, 40 arranged, the mutually aligned folds or elevations 42, 44, 46, 48, 50, 52 have, whereby a chambering takes place, which ensures that the subsequent rollers a clear fixation of the compacts 30, 32, 34, 36 with simultaneous Avoid breaking this is guaranteed.
  • it is required that the roller in the area of the free end faces of the semi-finished products 30, 32, 34, 36 Collar has to prevent the compacts 30, 32, 34, 36 from breaking out laterally.
  • the compacts 22, 30, 32, 34, 36 themselves preferably have a theoretical density of 70 % to 90%, which ensures the desired open porosity.
  • a treatment the compacts 22, 30, 32, 34, 36 before joining or plating with the sheets 26, 28, 38, 40 or the frame 24 is not necessary, since in the connection step "rolling" due to the shear forces occurring, a surface change takes place in such a way that break up existing oxide layers.
  • cold isostatic pressing can be carried out according to the invention.
  • a perforated support body with a cavity is used, into which a rubber-elastic mold is inserted, which in turn is filled with the mixture of the at least one metallic powder and the at least one gas-releasing propellant powder. Then the rubber-elastic form is closed. The interior of the rubber-elastic form is sucked off to be cold isostatic afterwards. Pressing gases do not have to compress.
  • the support body with the rubber-elastic form and the powder mixture present in this is exposed to a hydrostatic pressure of approx. 2 x 10 8 Pa.
  • the support body is placed in a corresponding container filled with water.
  • cold isostatic pressing it should also be noted that the basic body is manufactured at room temperature.
  • Corresponding composite bodies can be used as lightweight structures for the automotive sector or are used in general traffic engineering. Also a planking from Objects with corresponding composite bodies are conceivable.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Claims (10)

  1. Procédé de fabrication d'un matériau composite métallique,
    caractérisé par
    les étapes :
    mélange d'au moins une poudre métallique avec au moins un agent propulseur poudreux éliminant les gaz,
    moulage par pression du mélange ainsi obtenu pour former une pièce moulée à pores ouverts qui ne peut être moussée,
    combinaison de la pièce moulée à pores ouverts avec au moins une couche de protection, sachant que simultanément ou par la suite la pièce moulée avec la couche de protection est comprimée pour former un demi-produit à pores fermés pouvant être moussé, et
    moussage du demi-produit ainsi obtenu sous l'effet de la chaleur sans que la couche de protection ne fonde.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    le mélange est moulé par des presses isostatiques et/ou axiales, notamment par pressage à froid, pour former une pièce moulée en forme de barre, de parallélépipède ou de plaque.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    le demi-produit est soumis à un façonnage par pressage, cintrage ou emboutissage.
  4. Procédé selon au moins l'une des revendications précédentes,
    caractérisé en ce que
    le mélange destiné à former la pièce moulée à pores ouverts est exposé à une pression de 107 Pa à 2.108 Pa, en particulier de 3.107 à 12.107 Pa.
  5. Procédé selon au moins l'une des revendications précédentes,
    caractérisé en ce que,
    pendant la formation de la pièce moulée à pores ouverts par un pressage isostatique à froid, le mélange est exposé à la température ambiante.
  6. Procédé selon au moins l'une des revendications précédentes,
    caractérisé en ce que,
    pendant la formation de la pièce moulée à pores ouverts par un pressage axial, le mélange est exposé une température pouvant atteindre 250 °C.
  7. Procédé selon au moins l'une des revendications précédentes,
    caractérisé en ce que
    la pièce moulée présente une masse volumique se situant entre 70 % et 95 % de la masse volumique théorique du mélange constitué d'au moins une poudre métallique et d'au moins un agent propulseur poudreux éliminant les gaz.
  8. Demi-produit destiné à un corps métallique composite, constitué d'au moins une pièce moulée (22, 30, 32, 34) fabriquée à partir d'au moins une poudre métallique et d'au moins un agent propulseur poudreux éliminant les gaz, et d'une couche de protection (26, 28) combinée avec elle,
    caractérisé en ce que
    la pièce moulée (22, 30, 32, 34, 36) a des pores ouverts.
  9. Demi-produit selon la revendication 8,
    caractérisé en ce que,
    pendant le pressage destiné à former une âme à pores fermés et pouvant être moussée, la pièce moulée (22) est entourée sur sa circonférence par un cadre (24) et/ou sur ses faces inférieure et supérieure par des plaques (26, 28), ces derniers éléments étant constitués de métal
  10. Demi-produit selon la revendication 8,
    caractérisé en ce que
    plusieurs pièces moulées successives (30, 32, 34, 36) sont recouvertes sur leurs faces opposées par des tôles (38, 40) faisant office de couches de protection, sachant que deux pièces moulées consécutives sont séparées l'une de l'autre par des nervures telles que des feuillures (42, 44, 46, 48, 50, 52) conjuguées et issues des tôles (38, 40).
EP99122624A 1998-11-13 1999-11-13 Procédé de préparation d'un produit semi-fini moussable ainsi que d un produit semi-fini Expired - Lifetime EP1000690B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19852277A DE19852277C2 (de) 1998-11-13 1998-11-13 Verfahren zur Herstellung eines metallischen Verbundwerkstoffes sowie Halbzeug für einen solchen
DE19852277 1998-11-13

Publications (3)

Publication Number Publication Date
EP1000690A2 EP1000690A2 (fr) 2000-05-17
EP1000690A3 EP1000690A3 (fr) 2001-01-24
EP1000690B1 true EP1000690B1 (fr) 2004-09-29

Family

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EP99122624A Expired - Lifetime EP1000690B1 (fr) 1998-11-13 1999-11-13 Procédé de préparation d'un produit semi-fini moussable ainsi que d un produit semi-fini

Country Status (3)

Country Link
EP (1) EP1000690B1 (fr)
AT (1) ATE277710T1 (fr)
DE (2) DE19852277C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006053300A1 (de) * 2006-11-13 2008-05-15 Bayerische Motoren Werke Ag Sandwichbauteil

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10136370B4 (de) * 2001-07-26 2005-03-31 Schwingel, Dirk, Dr. Verbundwerkstoff und daraus hergestelltes Bauteil bestehend aus einem aufgeschäumten Metallkern und massiven Deckblechen, sowie Verfahren zur Herstellung
DE10215086B4 (de) * 2002-02-18 2004-01-29 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Aufschäumbarer Metallkörper, Verfahren zu seiner Herstellung und seine Verwendung
DE102004006034B4 (de) * 2004-02-06 2009-07-30 Schäfer Chemische Fabrik GmbH Verfahren zur Ausbildung und Feinverteilung feiner Wasserstoffbläschen in Wasserstoff enthaltenden Aluminium-Gusslegierungsschmelzen
DE102004039306A1 (de) * 2004-08-12 2006-02-23 Bayerische Motoren Werke Ag Verfahren zum Herstellen eines Verbundgussteils
DE102008027798A1 (de) * 2008-06-11 2009-12-24 Helmholtz-Zentrum Berlin Für Materialien Und Energie Gmbh Aluminiumlegierung für Metallschäume, ihre Verwendung und Verfahren zur Herstellung
DE202013103272U1 (de) 2013-07-22 2014-10-23 Wegener International Gmbh Heizeinrichtung für die Plastifizierung von Werkstücken aus einem thermoplastischen Kunststoff
DE102015205829B4 (de) 2015-03-31 2017-01-05 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Herstellung von geschäumten Sandwichelementen
DE102015118787A1 (de) * 2015-11-03 2017-05-04 HAVEL metal foam GmbH Verfahren und Vorrichtung zur Herstellung von Metallschaumverbundkörpern und Metallschaumverbundkörper
DE102017121512A1 (de) 2017-09-15 2019-03-21 Pohltec Metalfoam Gmbh Verfahren zum Schäumen von Metall mit Wärmekontakt
WO2019053181A1 (fr) 2017-09-15 2019-03-21 Pohltec Metalfoam Gmbh Procédé de moussage de métal par contact avec la chaleur
DE102017121511A1 (de) 2017-09-15 2019-03-21 Pohltec Metalfoam Gmbh Verfahren zur Herstellung eines Halbzeuges für einen Verbundwerkstoff
DE102017121513A1 (de) 2017-09-15 2019-03-21 Pohltec Metalfoam Gmbh Verfahren zum Schäumen von Metall im Flüssigkeitsbad

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DE4101630A1 (de) * 1990-06-08 1991-12-12 Fraunhofer Ges Forschung Verfahren zur herstellung aufschaeumbarer metallkoerper und verwendung derselben
DE4124591C1 (en) * 1991-01-21 1993-02-11 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung Ev, 8000 Muenchen, De Foamable metal body prodn. with reduced density differences - by charging hollow section with mixt. of powder contg. expanding agent and metal powder, and precompacting
DE4124491C1 (en) * 1991-07-24 1992-10-15 Erno Raumfahrttechnik Gmbh, 2800 Bremen, De Drive set with gaseous and/or liq. fuel delivery - has annular chamber, whose middle section is divided into several narrow chambers
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US5564064A (en) * 1995-02-03 1996-10-08 Mcdonnell Douglas Corporation Integral porous-core metal bodies and in situ method of manufacture thereof
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Publication number Priority date Publication date Assignee Title
DE102006053300A1 (de) * 2006-11-13 2008-05-15 Bayerische Motoren Werke Ag Sandwichbauteil

Also Published As

Publication number Publication date
DE19852277A1 (de) 2000-05-25
ATE277710T1 (de) 2004-10-15
EP1000690A3 (fr) 2001-01-24
EP1000690A2 (fr) 2000-05-17
DE19852277C2 (de) 2000-12-14
DE59910641D1 (de) 2004-11-04

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