EP1604756B1 - Verfahren zur Herstellung metallischer Gitterstrukturen - Google Patents

Verfahren zur Herstellung metallischer Gitterstrukturen Download PDF

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Publication number
EP1604756B1
EP1604756B1 EP05011668A EP05011668A EP1604756B1 EP 1604756 B1 EP1604756 B1 EP 1604756B1 EP 05011668 A EP05011668 A EP 05011668A EP 05011668 A EP05011668 A EP 05011668A EP 1604756 B1 EP1604756 B1 EP 1604756B1
Authority
EP
European Patent Office
Prior art keywords
cuvette
lattice elements
metal
structures
vessel
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.)
Not-in-force
Application number
EP05011668A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1604756A3 (de
EP1604756A2 (de
Inventor
Dieter Dr. Girlich
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.)
mpore GmbH
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to PL05011668T priority Critical patent/PL1604756T3/pl
Publication of EP1604756A2 publication Critical patent/EP1604756A2/de
Publication of EP1604756A3 publication Critical patent/EP1604756A3/de
Application granted granted Critical
Publication of EP1604756B1 publication Critical patent/EP1604756B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/005—Casting metal foams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B22C9/043—Removing the consumable pattern

Definitions

  • the invention relates to a method for producing metallic lattice structures in the form of open-pore foam.
  • Reticular structures made of metal and other materials have a wide range of applications due to their properties.
  • these structures may be used as low weight components, accumulator plates, electrochemical anodes and cathodes, filters and mixers for fluids, catalyst, gas absorbers, heat exchangers and many other applications.
  • U.S. Patent 3,616,841 discloses a method of making a foam material having a predetermined reticulated structure. This process involves the preparation of a self-supporting reticulated polyurethane foam; the preparation of a refractory mass by filling the voids of the polyurethane foam with an aqueous molding suspension and setting this suspension; heating the refractory mass to a temperature of about 120 ° C (250 ° F) for a period of two hours for drying; generating voids in the refractory molding material by raising the temperature of the refractory molding material to 650-850 ° C to volatilize all of the foam; introducing into the refractory molding compound a molten substance consisting of metals or metal alloys, the amount of substance sufficient to fill the cavities previously occupied by the reticulated structure were; and solidifying the molten substance by reducing the temperature to below the melting point of the substance; and washing out the material forming the refractory molding compound.
  • DE 199 39 155 discloses a method for producing metallic lattice structures in which a reticulated foam pre-structure is inserted into a hinged container, the foam pre-structure is infiltrated with a refractory material and the refractory material is then solidified. Subsequently, the solidified refractory material is removed from the hinged container, the foam pre-structure removed from the refractory material and the resulting, preheated body is inserted into a heat-resistant container. This body is infiltrated with a molten metal and removed from the heat-resistant container after the molten metal solidifies. Subsequently, the refractory material is removed from the body, as a result of which a reticular metal structure is obtained.
  • One advantage of this method is, inter alia, that bonding of the foam pre-structure to the sprue system and the sprue is no longer necessary as compared to said US Pat. No. 3,616,841. As a result, not only the material and time consumption in the production of the mold is significantly reduced, but also an automated production of reticular metallic structures possible.
  • the object of the invention is therefore to eliminate the disadvantages of the prior art.
  • a method for the production of metallic lattice structures is to be specified, which allows a lower use of materials and a faster production of such structures and consequently a series production.
  • the pre-structure by planar or separate thermal compression of the pre-structure such that it has from the outside inwardly increasing pores and thus a graded structure in the region of the compression, and for the production of metallic lattice structures although in basically known to use a reticulated preform, preferably a PU foam structure, but to thicken their webs previously by one or more times coating, by means of one or more different organic materials.
  • a reticulated preform preferably a PU foam structure
  • the inflow of the metal is facilitated.
  • the mechanical properties of the structure can thus be influenced in a targeted manner, wherein it is essential that the reproducibility of the characteristic values be sustainably improved compared with the prior art.
  • the thickness of the webs of the PU foam structure is adapted to the respective requirements determined by the intended use of the metal grid structure.
  • the coating of the webs of the pre-structure by means of liquid and / or solid materials is provided, for.
  • the use of powder prevents sticking of the structure and ensures a uniformly thick layer, especially since no membranes (cell skins) form between the webs.
  • the Vor Siemens is inserted in register in a frame and filled with molding material so that it is not completely covered, but rather a boundary of 2 to 5 mm remains free.
  • the remaining cavities are filled with sand and pressed.
  • the sheathing of the pre-structure is carried out with a ceramic slurry, wherein the sheath is optionally repeated to produce a stable layer.
  • the embedded molding can be refinished beforehand if necessary, such. B. by milling and drilling to produce knobs or other geometric shapes of solid material in the structure, or through holes to pour by means of core pins pipes in the structure.
  • the incorporation of continuous, but also non-continuous holes, grooves or the like in the cast-in pre-structure is carried out according to the invention at a distance of at least two pores to each other. This process step has the consequence that the density of the material and consequent its stability can be increased application specific; At the same time there is a sustained improvement in thermal conductivity.
  • the diameters of the recesses are optimized according to the strength requirements of the material
  • An essential further process step is the thermal removal of the preliminary structure by melting and / or burnout, for this purpose, the solidified structure-ceramic composite is taken out of the frame and placed in a cuvette whose bottom is filled with loose refractory material, preferably foundry sand. Alternatively, it is also possible to dry and burn out the molded part without cuvette by means of infrared or microwaves.
  • the cuvette comprises a molding sand / ceramic stencil for the runners; In addition, it has insulation to prevent premature cooling of the molded part.
  • the cuvette consists of a pressed molding sand / ceramic composite, wherein the molding sand is recyclable and also the use of molding material is reduced to the necessary volume.
  • the cuvette with the molding is placed for this purpose in a pressure-resistant container, filled with liquid metal, the container is closed and evacuated to degas the molding and the melt. By aerating the container, the melt is pressed into the molding.
  • the crucible is located in the container, the cuvette is connected by a tube to the melt.
  • the molding is removed from the cuvette.
  • the solidification can be done directionally over the cast metal parts.
  • the preliminary structure can also be produced by pouring granular mineral substances or granular organic substances with a mineral coating.
  • granular structures preferably in spherical pellets
  • PU foam structures usually pore sizes of max. 5 ppi, which corresponds to an average pore diameter of 8 to 10 mm, can be produced, can be realized with this pore sizes in the range of 1 to 3 cm.
  • the pellets are glued together over a large area, so that it is certain that only the cavities between the pellets are used as a pouring channel.
  • a coating of the pre-structure thus created is not provided and also not necessary because the desired ceramic coating is already present.
  • the other method steps according to the invention are retained.
  • the structure created in this way offers itself as a versatile lightweight construction material.
EP05011668A 2004-06-02 2005-05-31 Verfahren zur Herstellung metallischer Gitterstrukturen Not-in-force EP1604756B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05011668T PL1604756T3 (pl) 2004-06-02 2005-05-31 Metoda wytwarzania metalicznych struktur kratowych

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004026959 2004-06-02
DE102004026959A DE102004026959B3 (de) 2004-06-02 2004-06-02 Verfahren zur Herstellung metallischer Gitterstrukturen

Publications (3)

Publication Number Publication Date
EP1604756A2 EP1604756A2 (de) 2005-12-14
EP1604756A3 EP1604756A3 (de) 2005-12-28
EP1604756B1 true EP1604756B1 (de) 2007-03-21

Family

ID=35044778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05011668A Not-in-force EP1604756B1 (de) 2004-06-02 2005-05-31 Verfahren zur Herstellung metallischer Gitterstrukturen

Country Status (5)

Country Link
EP (1) EP1604756B1 (pl)
AT (1) ATE357302T1 (pl)
DE (2) DE102004026959B3 (pl)
ES (1) ES2285604T3 (pl)
PL (1) PL1604756T3 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8875395B2 (en) 2009-10-29 2014-11-04 Universiteit Gent Manufacturing heat exchanger from porous medium and conduits

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010112392A1 (en) 2009-04-03 2010-10-07 Nv Bekaert Sa 3 d heat exchanger
EP2446211B1 (en) 2009-04-03 2018-03-21 Universiteit Gent Improved heat exchanger
DE102013111516A1 (de) 2013-03-28 2014-10-02 Dieter Girlich Formstoff und Verfahren zur Herstellung zellularer Körper
DE102014118177A1 (de) 2013-12-19 2015-06-25 Mayser Gmbh & Co. Kg Verfahren zum Herstellen von metallischen Formkörpern, metallischer Formkörper und Verfahren zum Ausbilden eines Bauteils mit einem Wärmetauscher
DE102014118178A1 (de) 2013-12-19 2015-06-25 Mayser Gmbh & Co. Kg Verfahren zum Herstellen einer metallischen Struktur
US9737930B2 (en) 2015-01-20 2017-08-22 United Technologies Corporation Dual investment shelled solid mold casting of reticulated metal foams
US9789536B2 (en) 2015-01-20 2017-10-17 United Technologies Corporation Dual investment technique for solid mold casting of reticulated metal foams
US9789534B2 (en) 2015-01-20 2017-10-17 United Technologies Corporation Investment technique for solid mold casting of reticulated metal foams
US10035174B2 (en) 2015-02-09 2018-07-31 United Technologies Corporation Open-cell reticulated foam
US9884363B2 (en) 2015-06-30 2018-02-06 United Technologies Corporation Variable diameter investment casting mold for casting of reticulated metal foams

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE92519C (pl) *
US3666526A (en) * 1966-01-06 1972-05-30 Gen Electric Refractory porous bodies
US3946039A (en) * 1967-10-30 1976-03-23 Energy Research & Generation, Inc. Reticulated foam structure
US3616841A (en) * 1967-10-30 1971-11-02 Energy Research And Generation Method of making an inorganic reticulated foam structure
NL7607390A (nl) * 1975-07-09 1977-01-11 Montedison Spa Werkwijze voor de vervaardiging van metallische en/of metaalkeramische en/of keramische spons.
DE3917033C1 (pl) * 1989-05-26 1990-08-02 Olaf 2000 Hamburg De Ahlers
DE4128425A1 (de) * 1991-08-27 1992-03-19 Eska Medical Gmbh & Co Verfahren zur herstellung eines implantates mit einer seine oberflaeche zumindest teilweise bedeckenden metallischen offenmaschigen struktur
US5588477A (en) * 1994-09-29 1996-12-31 General Motors Corporation Method of making metal matrix composite
DE19509499A1 (de) * 1995-03-16 1996-09-19 Elastogran Gmbh Verfahren zur Herstellung von Polyurethan-Weichschaumstoffen mit einer unregelmäßigen Zellstruktur
DE19701806C2 (de) * 1997-01-21 1998-11-19 Didier Werke Ag Verwendung eines Drahtgeflechtes
DE19718886A1 (de) * 1997-05-03 1998-11-05 Bosch Gmbh Robert Verfahren zur Herstellung von porösen Formkörpern
DE19851250C2 (de) * 1998-11-06 2002-07-11 Ip & P Innovative Produkte Und Verfahren zum Herstellen offenporiger, metallischer Gitterstrukturen und Verbundgussteile sowie Verwendung derselben
DE19939155A1 (de) * 1999-08-20 2001-02-22 Pore M Gmbh Verfahren und Vorrichtung zur Herstellung von Glitternetzstrukturen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8875395B2 (en) 2009-10-29 2014-11-04 Universiteit Gent Manufacturing heat exchanger from porous medium and conduits

Also Published As

Publication number Publication date
DE502005000489D1 (de) 2007-05-03
EP1604756A3 (de) 2005-12-28
ATE357302T1 (de) 2007-04-15
ES2285604T3 (es) 2007-11-16
EP1604756A2 (de) 2005-12-14
PL1604756T3 (pl) 2007-08-31
DE102004026959B3 (de) 2006-02-16

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