DE102008008406B4 - Method for producing aircraft part negative molds by means of honeycombs - Google Patents
Method for producing aircraft part negative molds by means of honeycombs Download PDFInfo
- Publication number
- DE102008008406B4 DE102008008406B4 DE102008008406A DE102008008406A DE102008008406B4 DE 102008008406 B4 DE102008008406 B4 DE 102008008406B4 DE 102008008406 A DE102008008406 A DE 102008008406A DE 102008008406 A DE102008008406 A DE 102008008406A DE 102008008406 B4 DE102008008406 B4 DE 102008008406B4
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- DE
- Germany
- Prior art keywords
- aircraft part
- aircraft
- negative
- part negative
- paper
- 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 - Fee Related
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Classifications
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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
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
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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
- B29C33/30—Mounting, exchanging or centering
- B29C33/301—Modular mould systems [MMS], i.e. moulds built up by stacking mould elements, e.g. plates, blocks, rods
- B29C33/302—Assembling a large number of mould elements to constitute one cavity
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Laminated Bodies (AREA)
Abstract
Verfahren zur Herstellung von Flugzeugteil-Negativformen mittels Papierwaben mit folgenden Verfahrensschritten: – Fertigung von Stützen (2) mit entsprechendem Ausschnitt, der sich aus dem Rumpfquerschnitt ergibt – Bereitstellen von mehreren handelsüblichen Papierwaben-Blöcken – Herausschneiden von einem oder mehreren Keilen (a) aus jedem Papierwaben-Block – Zusammenkleben der Papierwaben an den Schnittflächen, so dass eine Flugzeugteil-Negativform (7, 8, 9, 10, 11, 12) mit geschlossener Oberfläche (15) entsteht, die eine Güte aufweist, die der einer CNC-Fräsfläche entspricht – Legen der Flugzeugteil-Negativform (7, 8, 9, 10, 11, 12) in jeweils mindestens 2 Stützen (2) – Aneinanderreihen der einzelnen Flugzeugteil-Negativformen (7, 8, 9, 10, 11, 12) so dass eine Negativhalbschale gebildet wird, die der einen Hälfte eines Flugzeugrumpfes entspricht – Versiegelung der Flugzeugteil-Negativformen (7, 8, 9, 10, 11, 12)Process for the production of aircraft part negative forms using paper honeycombs with the following process steps: - Production of supports (2) with a corresponding cutout that results from the fuselage cross-section - Provision of several commercially available paper honeycomb blocks - Cutting out one or more wedges (a) from each Paper honeycomb block - the paper honeycomb is glued together at the cut surfaces, so that a negative aircraft shape (7, 8, 9, 10, 11, 12) with a closed surface (15) is created, which has a quality that corresponds to that of a CNC milling surface - Laying the negative aircraft part mold (7, 8, 9, 10, 11, 12) in at least 2 supports (2) each - Lining up the individual negative aircraft part molds (7, 8, 9, 10, 11, 12) so that one Negative half-shell is formed, which corresponds to one half of an aircraft fuselage - sealing of the negative forms of aircraft parts (7, 8, 9, 10, 11, 12)
Description
Nach heutigem Stand der Technik sind Formwerkzeuge beim Herstellen von Bauelementen aus faserverstärktem Kunststoff im Flugzeugbau gebräuchlich und werden nach verschiedenen Methoden hergestellt. In der
Ein weiteres Verfahren zur Herstellung von Formteilen mittels Papierwaben ist aus
Aus dem Bereich des Schiffsbaus ist das Verfahren VARI (vacuum assisted resin infusion) bekannt. Dieses Verfahren ist für den Schiffsbau patentiert und kann lizenzfreifrei im Flugzeugbau verwendet werden. Das Verfahren braucht hier nicht genau beschrieben werden. Es ist allgemein bekannt und findet immer mehr Verwendung im Flugzeugbau, vor allem deswegen, da die Fasergelege im Vakuum geringsten Lufteinschluss aufweisen, sich an sämtliche Radien in der Form anlegen und durch den Umgebungsluftdruck eine autoclav-ähnliche Qualität bei geringeren Kosten aufweisen.From the field of shipbuilding the method VARI (vacuum assisted resin infusion) is known. This process is patented for shipbuilding and can be used free of charge in aircraft construction. The process need not be described exactly here. It is well known and is being used more and more in aircraft construction, especially because the fiber webs have the least air entrapment in the vacuum, apply to all the radii in the mold and have an autoclave-like quality at a lower cost due to the ambient air pressure.
Zudem werden oft beim Bau von Flugzeugen in Faserverbundbauweise die Teile Rumpf, Flügel und Leitwerke derart hergestellt, dass entweder im Handauflegeverfahren oder mit Harzinfusion Gewebelagen in Harz getränkt in Negativhalbschalen gelegt werden und diese nach dem Aushärten aus den Formen entfernt werden. Zwei Halbschalen werden dann zum Rumpf oder Flügel miteinander verklebt. Die Formen, die für diese Technik verwendet werden, bestehen meist aus CNC-gefrästen Polyurethanblöcken oder aus Blöcken ähnlichen Materials. Die Oberflächengüte dieser Formteile ist sehr genau, es muss immer noch eine Versiegelung der Formen stattfinden. Eine andere Methode, die Formen herzustellen geschieht über Außenspanten, über die Holzlättchen oder Ähnliches gestrakt werden. Dabei ist nichts zu fräsen, jedoch ist die Oberfläche der Form nicht perfekt und es muss viel Schleif- und Spachtelarbeit geleistet werden. Die Qualität der Form ist nicht so gut wie beim CNC-Fräsen. Eine dritte Methode, die Flugzeugteile herzustellen ist, dass man zuerst einen Positivkern herstellt und diesen dann abformt, z. B. mit faserverstärktem Kunststoff oder Laminierkeramik.In addition, the parts of the fuselage, wings and tail are often produced in the construction of aircraft in fiber composite construction, either soaked in resin by hand laydown or resin infiltrating tissue layers are placed in negative half-shells and these are removed after curing from the molds. Two half-shells are then glued together to the fuselage or wing. The molds used for this technique usually consist of CNC milled polyurethane blocks or block-like material. The surface quality of these moldings is very accurate, there must still be a sealing of the molds. Another method of making the molds is via outer frames, over which wooden slats or the like are gestrakt. There is nothing to mill, however, the surface of the mold is not perfect and it must be done a lot of grinding and putty work. The quality of the shape is not as good as in CNC milling. A third method to produce the aircraft parts is to first make a positive core and then mold it, e.g. B. with fiber-reinforced plastic or laminating ceramics.
Bei der Herstellung von Negativformen für Flugzeugteile mittels Waben werden die Vorteile des CNC-Fräsens – Genauigkeit und gute Oberflächenbeschaffenheit – mit der Einfachheit des Aufbaues von Spanten mit Beplankung verbunden.When producing negative molds for aircraft parts using honeycombs, the advantages of CNC milling - accuracy and good surface finish - are combined with the simplicity of the construction of frames with planking.
Am Beispiel eines Segelflugzeugrumpfes wird dies genauer ausgeführt. Verwendet werden handelsübliche Papierwaben, die in verschiedenen Größen erhältlich sind. So gibt es beispielsweise verschiedene Wabengrößen und Dimensionen der Wabenblöcke. Wie in
Die Eigenschaften der Waben, vor allem das Anschmiegen an starre Formen in einer Richtung, werden beim Formenbau genutzt.The properties of the honeycombs, especially the clinging to rigid shapes in one direction, are used in mold making.
Der Rumpf eines Segelflugzeuges wird im Plan wie in
Bei den Teilen
Die Stützen können leicht ausgetauscht werden für den Fall, dass man einen anderen Rumpfquerschnitt wünscht. Die Form muss nicht komplett neu gefräst werden.The supports can be easily replaced in case you want a different fuselage cross section. The shape does not have to be completely re-milled.
Bei den Teilformen
Alle vorbereiteten und auf Stützen gelegte Teilformen
Eine Senkung des vorderen Teiles des Rumpfes, wie es oft üblich ist, kann ebenso geschehen. Auch lässt sich der Rumpfquerschnitt durch Austausch der Stützen
Diese Methode kann auch auf Negativformen anderer Bauteile wie Flügel oder Leitwerke angewandt werden.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008008406A DE102008008406B4 (en) | 2008-02-09 | 2008-02-09 | Method for producing aircraft part negative molds by means of honeycombs |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008008406A DE102008008406B4 (en) | 2008-02-09 | 2008-02-09 | Method for producing aircraft part negative molds by means of honeycombs |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102008008406A1 DE102008008406A1 (en) | 2009-08-13 |
DE102008008406B4 true DE102008008406B4 (en) | 2012-06-14 |
Family
ID=40847345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE102008008406A Expired - Fee Related DE102008008406B4 (en) | 2008-02-09 | 2008-02-09 | Method for producing aircraft part negative molds by means of honeycombs |
Country Status (1)
Country | Link |
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DE (1) | DE102008008406B4 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2885772A (en) * | 1954-09-14 | 1959-05-12 | Northrop Aircraft Inc | Pre-contouring honeycomb cores before expansion of the honeycomb |
WO2002018121A1 (en) * | 2000-08-29 | 2002-03-07 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Method and device for inserting prepreg layers into shaping tools |
DE102005004345A1 (en) * | 2005-01-31 | 2006-08-10 | Arno Hoffmann | Honeycomb sandwich core for profile-shaped aircraft-parts, like wings consists of paper, metal or plastic ribs stuck together in profile shape and is consequently not machined on full span |
-
2008
- 2008-02-09 DE DE102008008406A patent/DE102008008406B4/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2885772A (en) * | 1954-09-14 | 1959-05-12 | Northrop Aircraft Inc | Pre-contouring honeycomb cores before expansion of the honeycomb |
WO2002018121A1 (en) * | 2000-08-29 | 2002-03-07 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Method and device for inserting prepreg layers into shaping tools |
DE102005004345A1 (en) * | 2005-01-31 | 2006-08-10 | Arno Hoffmann | Honeycomb sandwich core for profile-shaped aircraft-parts, like wings consists of paper, metal or plastic ribs stuck together in profile shape and is consequently not machined on full span |
Also Published As
Publication number | Publication date |
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DE102008008406A1 (en) | 2009-08-13 |
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OP8 | Request for examination as to paragraph 44 patent law | ||
8122 | Nonbinding interest in granting licences declared | ||
R087 | Non-binding licensing interest withdrawn | ||
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R018 | Grant decision by examination section/examining division | ||
R020 | Patent grant now final |
Effective date: 20120915 |
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R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20140902 |