EP2026925A1 - Method for metal foaming - Google Patents
Method for metal foamingInfo
- Publication number
- EP2026925A1 EP2026925A1 EP07725032A EP07725032A EP2026925A1 EP 2026925 A1 EP2026925 A1 EP 2026925A1 EP 07725032 A EP07725032 A EP 07725032A EP 07725032 A EP07725032 A EP 07725032A EP 2026925 A1 EP2026925 A1 EP 2026925A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- blowing agent
- foaming
- chips
- foamed
- 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.)
- Withdrawn
Links
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
- B22F8/00—Manufacture of articles from scrap or waste metal particles
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1121—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
- B22F3/1125—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers involving a foaming process
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Definitions
- the present invention relates to a metal foaming process for the production of porous metals, in particular for the production of metal foam bodies, preferably in a heat treatment process.
- Metal foam bodies in particular light metal foam bodies made of aluminum, are used, for example, in aerospace technology as lightweight structures. Metal foams (porous metals) or metal foam bodies are also used as lightweight and insulating structures in automobile construction and mechanical engineering.
- Metal foams can be manufactured using different metal foaming processes.
- the most developed metal foaming processes include powder metallurgical metal foaming processes, as these have some decisive advantages over the other manufacturing processes.
- a metal foaming process is known from DE 40 18 360 C1, in which a mixture of a metal powder to be foamed and a gas-releasing blowing agent powder is hot compacted.
- the compacted metal powder / blowing agent powder mixture is heated to a temperature above the decomposition temperature of the blowing agent, as a result of which the metal is foamed. After cooling, the metal foam body is obtained.
- the present invention is therefore based on the object of specifying a more cost-effective metal foaming process for producing metal foam bodies.
- the present invention is achieved according to the invention by a metal foaming process, in particular for the production of metal foam bodies, in which a mixture of recycling material of at least one metallic material and at least one blowing agent is foamed.
- chips from at least one metallic material can be used as recycling material.
- the metal foaming process according to the invention therefore uses in particular metallic chips instead of the usually used atomizing and thus cost-intensive powders, a selection of the metallic chips used depending on the desired alloy for the porous metal (for the metal foam body).
- the metallic material can consist of a metal or a metal alloy.
- the mixture of recycling material and blowing agent can be compacted into a foamable primary material.
- the metal foaming process can include, for example, rolling, extrusion or a combination of precompacting the mixture of recycling material and blowing agent (in particular by means of single-punch axial pressing) and a subsequent final compaction (in particular by means of extrusion) of the precompacted mixture.
- the recycling material can be adjusted to a certain size in a preparation process upstream of the mixing.
- a grinding process can be provided when using recycling material such as chips. It is also advantageous if the blowing agent is rolled into the recycling material, in particular homogeneously distributed, in the preparation process of the recycling material.
- the compacted mixture is heated to a temperature above the decomposition temperature of the blowing agent, preferably in the temperature range of the melting point of the metallic material used, and the body thus foamed is then cooled.
- This foaming can be carried out in a foam mold or in a component to be foamed.
- the exemplary embodiment of the method for producing a metal foam body described below uses chips as recycling material.
- chips are advantageous, especially due to the good availability, for example from metal cutting.
- the present teaching is not restricted from this. Rather, other recycling materials could also be used, for example powdery substances occurring during processing.
- metal chips eg made of aluminum
- blowing agent powder eg TiH 2
- These metallic chips can also have a relatively wide size distribution, if appropriate. In this way, chips can be used (at least partially) without prior processing. However, the chips should be as short as possible in order to achieve good miscibility with the blowing agent.
- the processing of the chips involves the preparation of long as well as short chips in a previous preparation process, such as grinding, to a size or size distribution which is suitable for good miscibility with the at least one blowing agent. It is also advantageous if the blowing agent is already rolled in homogeneously distributed in the chips in the processing process.
- a selection of the desired alloy for the metal foam body determines the metal chips to be used (or the metals / metal alloys from which the chips consist).
- production waste from machining is used as the starting material for the metal foam process.
- These chips are produced in large quantities for numerous metals / alloys. Usually, these are integrated into a cycle process and thus recycled.
- the chips are waste products, significant cost advantages are achieved compared to the atomizing powders to be produced separately. Any existing contamination of the chips can be removed in a preliminary process, so that contamination of the porous metal to be produced can be avoided.
- the mixture is precompacted into foamable precursors (for example, blocks) by means of single-punch axial pressing and the precompacts (blocks) precompacted in this way are extruded.
- a foam mold or a component to be foamed is then filled with the compacted foamable primary material.
- the compacted foamable primary material is then heated above the melting point of the metal or above / into the melting range of the metal alloy and the decomposition point of the blowing agent.
- the foam mold or the component to be foamed is cooled to room temperature.
- the present invention thus enables the use of production waste from machining for the production of metal foam bodies, as a result of which clear advantages over the known powder metallurgical metal foam processes can be achieved.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610024945 DE102006024945A1 (en) | 2006-05-29 | 2006-05-29 | Metallschäumungsverfahren |
PCT/EP2007/004110 WO2007137681A1 (en) | 2006-05-29 | 2007-05-09 | Method for metal foaming |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2026925A1 true EP2026925A1 (en) | 2009-02-25 |
Family
ID=38241678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07725032A Withdrawn EP2026925A1 (en) | 2006-05-29 | 2007-05-09 | Method for metal foaming |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2026925A1 (en) |
DE (1) | DE102006024945A1 (en) |
WO (1) | WO2007137681A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021126310A1 (en) | 2021-10-11 | 2023-04-13 | HAVEL metal foam GmbH | Method and device for producing a foamable, band-shaped pressed powder metal blank by means of cold rolling and pressed powder metal blank |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3725037A (en) * | 1971-02-25 | 1973-04-03 | Ethyl Corp | Foamed aluminum |
FR2435534A1 (en) * | 1978-07-25 | 1980-04-04 | Snecma | NOVEL METAL POROUS BODIES AND THEIR PREPARATION PROCESS |
DE4018360C1 (en) * | 1990-06-08 | 1991-05-29 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung Ev, 8000 Muenchen, De | Porous metal body prodn. - involves compaction at low temp. followed by heating to near melting point of metal |
AT405946B (en) * | 1998-01-16 | 1999-12-27 | Illichmann Gmbh Leichtmetallgu | Process for producing a semi-finished powder metallurgy product |
CA2344088A1 (en) * | 2001-01-16 | 2002-07-16 | Unknown | A method and an apparatus for production of a foam metal |
RU2200647C1 (en) * | 2001-07-17 | 2003-03-20 | Литвинцев Александр Иванович | Method for making porous semifinished products of aluminium alloy powders |
WO2006005150A1 (en) * | 2004-07-15 | 2006-01-19 | Serguei Vatchiants | Processes for production of foamed aluminum bodies from coated aluminum powder |
-
2006
- 2006-05-29 DE DE200610024945 patent/DE102006024945A1/en not_active Ceased
-
2007
- 2007-05-09 WO PCT/EP2007/004110 patent/WO2007137681A1/en active Application Filing
- 2007-05-09 EP EP07725032A patent/EP2026925A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2007137681A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2007137681A1 (en) | 2007-12-06 |
DE102006024945A1 (en) | 2007-12-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20081112 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA HR MK RS |
|
DAX | Request for extension of the european patent (deleted) | ||
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SCHAEFFLER, PETER Inventor name: HIPKE, THOMAS Inventor name: HOHLFELD, JOERG |
|
17Q | First examination report despatched |
Effective date: 20090406 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): AT DE ES FR IT |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20091117 |