DE102012013538A1 - Method for manufacturing sandwich element, involves injecting liquid, foamable material injected into free space for connecting covering layers to sandwich element, where covering layers are formed as preformed fiber semi-finished products - Google Patents
Method for manufacturing sandwich element, involves injecting liquid, foamable material injected into free space for connecting covering layers to sandwich element, where covering layers are formed as preformed fiber semi-finished products Download PDFInfo
- Publication number
- DE102012013538A1 DE102012013538A1 DE201210013538 DE102012013538A DE102012013538A1 DE 102012013538 A1 DE102012013538 A1 DE 102012013538A1 DE 201210013538 DE201210013538 DE 201210013538 DE 102012013538 A DE102012013538 A DE 102012013538A DE 102012013538 A1 DE102012013538 A1 DE 102012013538A1
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- Germany
- Prior art keywords
- tool
- cover layers
- layers
- covering layers
- sandwich element
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/12—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels
- B29C33/14—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels against the mould wall
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/1228—Joining preformed parts by the expanding material
- B29C44/1233—Joining preformed parts by the expanding material the preformed parts being supported during expanding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/58—Moulds
- B29C44/585—Moulds with adjustable size of the mould cavity
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Sandwichelementen gemäß dem Oberbegriff des Patentanspruchs 1 sowie eine Vorrichtung zur Herstellung von Sandwichelementen gemäß dem Patentanspruch 8.The invention relates to a method for producing sandwich elements according to the preamble of patent claim 1 and to an apparatus for producing sandwich elements according to patent claim 8.
Sandwichelemente, die aus einem schäumbaren Material und wenigstens aus zwei dünnen Deckschichten bestehen, sind für unterschiedliche Anwendungen einsetzbar, da diese Sandwichelemente eine hohe Festigkeit bei gleichzeitig geringem Gewicht besitzen. Die Deckschichten können aus einem Faserwerkstoff bestehen, die über einen Sandwichkern, der von dem schäumbaren Material gebildet wird, zu einem Sandwichelement verbunden sind. Derartige Sandwichelemente können als komplexe dreidimensionale Formteile ausgebildet sein.Sandwich elements, which consist of a foamable material and at least two thin cover layers, can be used for different applications, since these sandwich elements have a high strength and low weight. The cover layers may consist of a fiber material, which are connected via a sandwich core, which is formed by the foamable material, to form a sandwich element. Such sandwich elements may be formed as complex three-dimensional molded parts.
Ein Sandwichelement kann auch aus vorgefertigten Formteilen zusammengesetzt sein, wobei auf einen bereits in ausgehärteter Form vorliegenden Sandwichkern beidseitig entsprechend vorgeformte Deckschichten aufgeklebt werden. Dies erfordert aber zusätzliche Verfahrensschritte und auch die Verwendung zusätzlicher Klebemittel, gegenüber einem Herstellungsverfahren, bei dem die Deckschichten direkt beim Schäumvorgang des Sandwichkerns mit diesem verbunden werden.A sandwich element may also be composed of prefabricated molded parts, wherein correspondingly preformed cover layers are adhesively bonded to a sandwich core already present in cured form on both sides. However, this requires additional process steps and also the use of additional adhesives, compared to a production process in which the cover layers are connected directly during the foaming process of the sandwich core with this.
Aus der
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung von Sandwichelementen anzugeben, welches einen möglichst einfachen Aufbau für das Sandwichelement unter Anwendung möglichst weniger Verfahrensschritte ermöglicht.The invention has for its object to provide a method for producing sandwich elements, which allows the simplest possible structure for the sandwich element using as few process steps.
Die Lösung dieser Aufgabe wird mit den Merkmalen des Patentanspruchs 1 erreicht. Bevorzugte Weiterbildungen des erfindungsgemäßen Verfahrens sind in den Unteransprüchen 2 bis 7 offenbart.The solution of this problem is achieved with the features of claim 1. Preferred developments of the method according to the invention are disclosed in the
Gemäß dem kennzeichnenden Teil des Patentanspruchs 1 werden die Deckschichten an gegenüberliegenden Werkzeugflächen mittels einer im Werkzeug angeordneten Haltevorrichtung im Abstand voneinander gehalten, so dass zwischen den Deckschichten ein Freiraum besteht. In diesen Freiraum kann dann ein flüssiges, schäumbares Material injiziert werden, welches den gesamten Freiraum homogen ausfüllt und sich mit den Deckschichten zu einem Sandwichelement verbindet. Da bei diesem Verfahren keine zwischen den Deckschichten angeordneten Abstandshalter erforderlich sind, kann mit dem erfindungsgemäßen Verfahren ein Sandwichelement hergestellt werden, das einen homogenen Wandaufbau hat, und zwar insbesondere auch dann, wenn das Sandwichelement ein verhältnismäßig komplexes dreidimensionales Element ist. Die vorzugsweise als trockene Faserhalbzeuge ausgebildeten Deckschichten werden beim Schäumvorgang in ihrer Position nicht verändert, sondern sind an den Werkzeugflächen fixiert. Beim Schäumvorgang werden die beispielsweise als Faserhalbzeuge ausgebildeten Deckschichten vom schäumbaren Material durchdrungen und dabei imprägniert und gleichzeitig fest mit dem geschäumten, ausgehärteten Kern des Sandwichelements verbunden.According to the characterizing part of patent claim 1, the cover layers are held at opposite tool surfaces by means of a holding device arranged in the tool at a distance from each other, so that there is a free space between the cover layers. In this space then a liquid, foamable material can be injected, which fills the entire space homogeneously and connects to the cover layers to form a sandwich element. Since no spacers arranged between the cover layers are required in this method, a sandwich element can be produced by the method according to the invention, which has a homogeneous wall construction, in particular even if the sandwich element is a relatively complex three-dimensional element. The cover layers, which are preferably designed as dry semi-finished fiber products, are not changed in their position during the foaming process but are fixed to the tool surfaces. During the foaming process, the cover layers formed, for example, as semi-finished fiber products are penetrated by the foamable material and thereby impregnated while at the same time firmly bonded to the foamed, hardened core of the sandwich element.
Das Herstellungsverfahren erfordert somit wenige Verfahrensschritte. Außerdem ist die Verwendung zusätzlicher Klebstoffe oder die Verwendung zusätzlicher Abstandselemente nicht erforderlich.The manufacturing process thus requires few process steps. In addition, the use of additional adhesives or the use of additional spacers is not required.
Die Deckschichten können in vorteilhafter Weise an den gegenüberliegenden Werkzeugflächen mittels Saugvorrichtungen gehalten werden. Über Saugkanäle kann an den Werkzeugflächen ein Unterdruck erzeugt werden, der die Deckschichten während des Schäumvorganges an den Werkzeugflächen festhält. Dadurch kann ebenfalls ein Vakuum erzeugt/unterstützt werden.The cover layers can be held in an advantageous manner on the opposite tool surfaces by means of suction devices. Via suction channels, a negative pressure can be generated on the tool surfaces, which holds the cover layers during the foaming process on the tool surfaces. As a result, a vacuum can also be generated / supported.
Besonders vorteilhaft ist es, wenn die Deckschichten mittels magnetischer Kraft an den gegenüberliegenden Werkzeugflächen gehalten werden. Dies kann dadurch erfolgen, dass die Deckschichten selbst magnetisiert sind und an den metallischen Oberflächen magnetisch anhaften. Andererseits besteht aber auch die Möglichkeit, im Werkzeug eine Haltevorrichtung vorzusehen, die ein magnetisches Feld erzeug, welches die Deckschichten, die wenigstens teilweise aus einem magnetischen Material bestehen, an den Werkzeugflächen festhält.It is particularly advantageous if the cover layers are held by means of magnetic force on the opposite tool surfaces. This can be done by the cover layers themselves being magnetized and adhering magnetically to the metallic surfaces. On the other hand, it is also possible to provide a holding device in the tool which generates a magnetic field which holds the cover layers, which consist at least partially of a magnetic material, to the tool surfaces.
Das magnetische Festhalten der Deckschichten während des Schäumvorgangs hat den Vorteil, dass die Werkzeugflächen vollständig geschlossen sein können, so dass das fertiggestellte Sandwichelement eine entsprechend glatte Oberfläche hat, die keine besondere Nachbehandlung erfordert.The magnetic retention of the cover layers during the foaming process has the advantage that the tool surfaces can be completely closed, so that the finished sandwich element has a correspondingly smooth surface, which does not require any special aftertreatment.
Weiterhin besteht auch die Möglichkeit, die Deckschichten mittels Haken oder anderer Halteelemente an den Werkzeugflächen so lange zu halten, bis das schäumbare Material den Freiraum zwischen den Deckschichten ausgefüllt hat. Werden dann die Halteelemente entfernt, so dass eine geschlossene Werkzeugfläche entsteht, ergibt dies ebenfalls ein fertiges Sandwichelement mit einer Oberfläche, die keine besondere Nachbehandlung erfordert. Furthermore, it is also possible to hold the cover layers by means of hooks or other holding elements on the tool surfaces until the foamable material has filled the space between the cover layers. Then, if the holding elements are removed, so that a closed tool surface is formed, this also results in a finished sandwich element with a surface that requires no special aftertreatment.
Vorteilhaft kann es auch sein, die Deckschicht mittels eines Adhäsionsmittels an den Werkzeugflächen lösbar festzuhalten, so dass nach dem Aushärten des geschäumten Materials das fertige Sandwichelement rückstandsfrei aus dem Werkzeug entnommen werden kann. Das Adhäsionsmittel kann zu diesem Zweck auf die Deckschichten und/oder auf die Werkzeugflächen aufgebracht werden.It may also be advantageous to releasably hold the covering layer to the tool surfaces by means of an adhesive, so that after curing of the foamed material, the finished sandwich element can be removed without residue from the tool. The adhesive can be applied for this purpose on the cover layers and / or on the tool surfaces.
Der Erfindung liegt die weitere Aufgabe zugrunde, eine Vorrichtung zur Herstellung von Sandwichelementen zu schaffen, mit der das Herstellungsverfahren auf möglichst einfache Weise durchführbar ist.The invention has the further object of providing a device for producing sandwich elements, with which the manufacturing process in the simplest possible way is feasible.
Die Lösung dieser Aufgabe wird mit den Merkmalen des Patentanspruchs 8 erhalten. Vorteilhafte Weiterbildungen der die Vorrichtung betreffenden Erfindung sind in den Unteransprüchen 9 bis 12 offenbart.The solution to this problem is obtained with the features of claim 8. Advantageous developments of the invention concerning the device are disclosed in the
Mit den Merkmalen des Patentanspruchs 8, der vorsieht, dass zumindest im Oberwerkzeug des zur Herstellung verwendeten Werkzeugs, eine Haltevorrichtung angeordnet ist, die die an ihr anliegende Deckschicht lösbar festhält, wird erreicht, dass zwischen den Deckschichten im Werkzeug keine Abstandshalter oder sonstigen Distanzelemente verwendet werden müssen.With the features of claim 8, which provides that at least in the upper tool of the tool used for the production, a holding device is arranged, which removably holds the covering layer applied to it, it is achieved that between the cover layers in the tool no spacers or other spacers are used have to.
Außerdem erhält man dadurch die Möglichkeit, die Dicke des herzustellenden Sandwichelements variabel einstellen zu können, indem die Werkzeugflächen in ihrem Abstand zueinander entsprechend positioniert werden. Damit lassen sich ohne Verwendung zusätzlicher Abstandselemente unterschiedliche Wandstärken an den herzustellenden Sandwischelementen auf sehr einfache Weise realisieren.In addition, this gives the possibility of being able to variably set the thickness of the sandwich element to be produced by positioning the tool surfaces in their mutual distance. This allows different wall thicknesses to be realized on the sand wiping elements to be produced in a very simple manner without the use of additional spacer elements.
Die Haltevorrichtung kann als Saugvorrichtung oder als elektrische Magnetvorrichtung oder auch als eine mechanische Haltevorrichtung, beispielsweise mit in das Werkzeug zurückziehbaren Haken, ausgebildet sein. Grundsätzlich besteht dabei auch die Möglichkeit, diese Haltevorrichtungen zu kombinieren, so dass je nach Anwendungsfall und je nach Beschaffenheit der verwendeten Deckschichten entsprechende Haltevorrichtungen zum Einsatz kommen können.The holding device may be formed as a suction device or as an electrical magnetic device or as a mechanical holding device, for example, with retractable hook in the tool. In principle, it is also possible to combine these holding devices, so that depending on the application and depending on the nature of the outer layers used corresponding holding devices can be used.
Die Erfindung ist nachfolgend anhand von in der Zeichnung dargestellten Ausführungsbeispielen näher erläutert.The invention is explained in more detail with reference to embodiments shown in the drawing.
Es zeigen:Show it:
Das in
Über einen seitlich am Werkzeug
Das in
Sobald der Sandwichkern
Bei dem in
Als Haltevorrichtung für die Deckschichten
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- EP 2018948 A1 [0004] EP 2018948 A1 [0004]
Claims (12)
Priority Applications (1)
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DE102012013538.6A DE102012013538B4 (en) | 2012-07-06 | 2012-07-06 | Process for the production of sandwich elements |
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DE102012013538.6A DE102012013538B4 (en) | 2012-07-06 | 2012-07-06 | Process for the production of sandwich elements |
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DE102012013538A1 true DE102012013538A1 (en) | 2014-01-09 |
DE102012013538B4 DE102012013538B4 (en) | 2019-03-07 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015137996A1 (en) * | 2014-03-11 | 2015-09-17 | Gulfstream Aerospace Corporation | Components made from panels and methods of producing the same |
DE102017130341A1 (en) | 2017-12-18 | 2019-06-19 | Brandenburgische Technische Universität Cottbus-Senftenberg | METHOD FOR PRODUCING SANDWICH COMPONENTS WITH FIBER-REINFORCED COVERINGS |
DE102022117874A1 (en) | 2022-07-18 | 2024-01-18 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Method for producing a component from a composite material |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3957473B1 (en) | 2020-08-19 | 2023-02-08 | Webasto SE | Method for producing a vehicle composite profile |
Citations (6)
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DE19822113C1 (en) * | 1998-05-08 | 1999-09-09 | Sommer Allibert Lignotock Gmbh | Component molding process, especially for the production of vehicle internal panels with base and decorative layers and a foam layer between them |
DE10107269A1 (en) * | 2001-02-16 | 2002-08-22 | Volkswagen Ag | Lining e.g. for a vehicle, is produced by placing a mat material in a molding tool, and supplying the mould with liquid plastic, which penetrates the mat and takes on the upper mould inner profile |
EP2018948A1 (en) | 2007-07-27 | 2009-01-28 | Sika Technology AG | Method for manufacturing a sandwich element |
DE102007051132A1 (en) * | 2007-10-24 | 2009-04-30 | Polymerpark Technologies Gmbh + Co.Kg | Sandwich structure and method of making the same |
DE102008031814B3 (en) * | 2008-06-25 | 2010-01-21 | Decoma (Germany) Gmbh | Method for manufacturing component, involves arranging adhesive agent at inner wall of mold half of molding machine, where foil is fixed at inner wall by adhesive agent |
DE102010052597A1 (en) * | 2010-11-25 | 2012-05-31 | Daimler Ag | Preform and manufacturing device for fiber composite components from preforms |
Family Cites Families (1)
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DE10353070B4 (en) | 2003-11-13 | 2005-09-15 | Airbus Deutschland Gmbh | Method and apparatus for binder activation on a semifinished fiber product / preform by direct heating of carbon fibers via an applied electrical voltage |
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2012
- 2012-07-06 DE DE102012013538.6A patent/DE102012013538B4/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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DE19822113C1 (en) * | 1998-05-08 | 1999-09-09 | Sommer Allibert Lignotock Gmbh | Component molding process, especially for the production of vehicle internal panels with base and decorative layers and a foam layer between them |
DE10107269A1 (en) * | 2001-02-16 | 2002-08-22 | Volkswagen Ag | Lining e.g. for a vehicle, is produced by placing a mat material in a molding tool, and supplying the mould with liquid plastic, which penetrates the mat and takes on the upper mould inner profile |
EP2018948A1 (en) | 2007-07-27 | 2009-01-28 | Sika Technology AG | Method for manufacturing a sandwich element |
DE102007051132A1 (en) * | 2007-10-24 | 2009-04-30 | Polymerpark Technologies Gmbh + Co.Kg | Sandwich structure and method of making the same |
DE102008031814B3 (en) * | 2008-06-25 | 2010-01-21 | Decoma (Germany) Gmbh | Method for manufacturing component, involves arranging adhesive agent at inner wall of mold half of molding machine, where foil is fixed at inner wall by adhesive agent |
DE102010052597A1 (en) * | 2010-11-25 | 2012-05-31 | Daimler Ag | Preform and manufacturing device for fiber composite components from preforms |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015137996A1 (en) * | 2014-03-11 | 2015-09-17 | Gulfstream Aerospace Corporation | Components made from panels and methods of producing the same |
DE102017130341A1 (en) | 2017-12-18 | 2019-06-19 | Brandenburgische Technische Universität Cottbus-Senftenberg | METHOD FOR PRODUCING SANDWICH COMPONENTS WITH FIBER-REINFORCED COVERINGS |
DE102017130341B4 (en) | 2017-12-18 | 2022-10-13 | Brandenburgische Technische Universität Cottbus-Senftenberg | METHOD AND SYSTEM FOR MANUFACTURING SANDWICH COMPONENTS WITH FIBER-REINFORCED COVER LAYERS AND SANDWICH COMPONENTS |
DE102022117874A1 (en) | 2022-07-18 | 2024-01-18 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Method for producing a component from a composite material |
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