EP1592535B1 - Method for preparing surfaces of carbon fiber-reinforced plastics for further processing into supporting structural parts - Google Patents
Method for preparing surfaces of carbon fiber-reinforced plastics for further processing into supporting structural parts Download PDFInfo
- Publication number
- EP1592535B1 EP1592535B1 EP03795730A EP03795730A EP1592535B1 EP 1592535 B1 EP1592535 B1 EP 1592535B1 EP 03795730 A EP03795730 A EP 03795730A EP 03795730 A EP03795730 A EP 03795730A EP 1592535 B1 EP1592535 B1 EP 1592535B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- surfaces according
- preparing plastics
- plastics surfaces
- blasting agent
- preparing
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012545 processing Methods 0.000 title claims description 10
- 239000004918 carbon fiber reinforced polymer Substances 0.000 title abstract description 6
- 239000004033 plastic Substances 0.000 claims abstract description 17
- 229920003023 plastic Polymers 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 4
- 239000011265 semifinished product Substances 0.000 claims abstract description 3
- 238000005422 blasting Methods 0.000 claims description 23
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000010431 corundum Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 230000003628 erosive effect Effects 0.000 claims 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 239000011151 fibre-reinforced plastic Substances 0.000 claims 1
- 238000007689 inspection Methods 0.000 claims 1
- 238000003908 quality control method Methods 0.000 abstract description 2
- 239000003082 abrasive agent Substances 0.000 abstract 1
- 238000007664 blowing Methods 0.000 abstract 1
- 239000000523 sample Substances 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000275 quality assurance Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 239000011049 pearl Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/06—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for producing matt surfaces, e.g. on plastic materials, on glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
Definitions
- the invention relates to a method for the preparation of plastic surfaces, namely surfaces of semi-finished carbon fiber reinforced plastic, for further processing to structural parts by means of adhering, in particular to wings of aircraft, by abrasive removal of the surface.
- the surfaces intended for further processing by gluing are first ground and elaborate quality assurance measures taken to control the grinding result.
- a waterbreak test is carried out, which uses the different surface tension of ground and contaminated surfaces in order to determine the quality of the grinding result u.
- the adhesive surface is completely wetted with deionized water. Then the surface is placed vertically, so that the water can drain off. When the surface is well cleaned, the water flows evenly. At polluted places water pearls form. Such places must be reground. To remove the water or a residual moisture, the parts must be dried in the oven.
- the object of the invention is to provide a method for the preparation of plastic surfaces, namely surfaces of semi-finished carbon fiber reinforced plastic, for further processing to structural parts by means of sticking, in particular to wings of aircraft, by abrasive removal of the surface to propose that the risk of separation of Fibers reduced but at the same time allows a higher strength of the bond with less rework.
- This object is achieved in the generic method in that the removal takes place by blasting the surface by means of a distributed in a gaseous fluid blasting agent. Measure the time it takes to get the surface down to the fiber ablate, ie destroy, surprisingly enough, about the tenth part of this time to achieve sufficient for the bonding treatment of the surface. The quality of this surface surpasses that of a polished surface. In fracture tests, the components fail not at the splice, but in the base material, which advantageously increases the capacity of the bonded structural parts.
- Contamination of the mechanically cleaned surface by the fluid is advantageously avoided by the fact that the gaseous fluid is dried and de-oiled air.
- An advantageous uniform work result can be achieved by the blasting agent is applied by means of a low-pressure jet, preferably from a pressure vessel with less than 2.5 bar, to the surface to be treated.
- the same purpose serves the measure that the blasting agent is applied by means of a vortex jet nozzle to the surface to be treated.
- the orbiting jet of the vortex jet nozzle prevents the formation of disadvantageous so-called hot spots.
- optical control of the work result is sufficient to ensure sufficient surface quality.
- the treatment with the blasting agent is carried out until an almost cloud-free matte treated surface is reached. This quality is advantageous according to the DIN EN ISO 12944-4 SA 2.5 on the Work result defined. Elaborate water-break tests with drying steps in elaborate because large ovens can be omitted.
- a quality control of the treated surface is carried out by measuring a surface resistance and / or by visual inspection on the basis of a comparative sample.
- the reproducibility of the work result is further improved if the treatment takes place in an air-conditioned, preferably draft-free, environment.
- the surface is vacuum-packed for transport.
- Such a package is already sufficient to transfer the operation according to the invention from the dust-sensitive component assembly to external suppliers.
- the statistical stability of the work result with its qualitative advantages is further improved if the abrasive is not circulated.
- ablated particles of the base material remain in the blasting agent.
- the preparation by means of magnetic separators is not possible with the plastics to be treated by the process according to the invention, since they are non-magnetic. You must therefore by means of Windscreens or be worked up by flotation. The absence of a preparation also saves these process steps.
- the surface for further processing into structural parts, in particular aircraft airfoils is shaped by treatment in one or more of the above methods by means of a jet dispersed in a gaseous fluid.
- prepregs are pretreated by pressure blasting method according to the invention for bonding eg with stringers on outer skins, Tiesverklebung, ribs, fittings, etc.
- the method causes a low material removal, without affecting the dimensional accuracy of the component is impaired. It cleans the surface by a mechanical removal of the surface, which can be dosed but particularly advantageous. There is an approx. 10-fold safety against damage to fibers of the plastic.
- the blast treatment is carried out dry, the effect on the component surface being determined essentially by the choice of blasting medium. The surface roughness is determined primarily by the blasting agent and the pressure.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Reinforced Plastic Materials (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Inorganic Fibers (AREA)
- Ceramic Products (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Vorbereitung von Kunststoffoberflächen, nämlich von Oberflächen von Halbzeugen aus kohlenstofffaserverstärktem Kunststoff, für die Weiterverarbeitung zu tragenden Strukturteilen mittels kleben, insbesondere zu Tragflächen von Fluggeräten, durch abrasiven Abtrag der Oberfläche.The invention relates to a method for the preparation of plastic surfaces, namely surfaces of semi-finished carbon fiber reinforced plastic, for further processing to structural parts by means of adhering, in particular to wings of aircraft, by abrasive removal of the surface.
Aus der
Derartig vorbereitete Oberflächen werden im modernen Flugzeugbau benötigt, um durch die Verarbeitung kohlenstofffaserverstärkter Kunststoffe noch leichtere Strukturen bauen zu können. Beispielsweise müssen die Klebeflächen der Ober- und Unterschale von Tragflächen sorgfältig vorbehandelt werden, bevor sie zum fertigen Flügel verklebt werden. Dabei sind zwischen den Schalen auch Spanten und Stringer einzulaminieren.Surfaces prepared in this way are needed in modern aircraft construction in order to be able to build even lighter structures by processing carbon-fiber-reinforced plastics. For example, the adhesive surfaces of the upper and lower shell of wings must be carefully pretreated before they are glued to the finished wing. It is also necessary to encapsulate ribs and stringers between the shells.
Die im Betrieb extrem belasteten Strukturteile dürfen nicht versagen. Erfahrungsgemäß sind Klebestellen jedoch häufig, aufgrund von Fehlstellen geringerer Festigkeit als der Grundwerkstoff, Ursache für eine nicht zu tolerierende Schwächung des Strukturteils.The structural parts subjected to extreme stress during operation must not fail. Experience has shown, however, splices are often due to defects of lesser strength than the base material, cause of an unacceptable weakening of the structural part.
Zur Vermeidung solcher Fehlstellen werden die für die Weiterverarbeitung durch Kleben vorgesehenen Oberflächen zunächst geschliffen und aufwendige Qualitätssicherungsmaßnahmen getroffen, um das Schleifergebnis zu kontrollieren.To avoid such defects, the surfaces intended for further processing by gluing are first ground and elaborate quality assurance measures taken to control the grinding result.
Beim Schleifen laminierter rauer Oberflächen besteht die Gefahr, daß die festigkeitsbestimmenden Fasern durch den Schleifprozess verletzt werden. Hierfür sind optische Kontrollen erforderlich, da durchgeschliffene Fasern unzulässig sind. Zusätzlich wird eine Messung des Oberflächenwiderstandes vorgenommen.When grinding laminated rough surfaces, there is a risk that the strength-determining fibers will be damaged by the grinding process. For this purpose, optical controls are required as durchgeschliffene Fibers are inadmissible. In addition, a measurement of the surface resistance is made.
Zur Ermittlung verunreinigter Stellen wird ein Waterbreak-Test durchgeführt, der die unterschiedliche Oberflächenspannung geschliffener und verunreinigter Flächen nutzt, um eine Aussage über die Qualität des Schleifergebnisses u treffen. Dabei wird die Klebefläche mit entionisiertem Wasser vollständig benetzt. Anschließend wird die Fläche senkrecht gestellt, damit das Wasser abfließen kann. Bei gut gereinigter Oberfläche fließt das Wasser gleichmäßig ab. An verschmutzten Stellen bilden sich Wasserperlen. Solche Stellen müssen nachgeschliffen werden. Zur Entfernung des Wassers bzw. einer Restfeuchtigkeit müssen die Teile noch im Ofen getrocknet werden.To determine contaminated areas, a waterbreak test is carried out, which uses the different surface tension of ground and contaminated surfaces in order to determine the quality of the grinding result u. The adhesive surface is completely wetted with deionized water. Then the surface is placed vertically, so that the water can drain off. When the surface is well cleaned, the water flows evenly. At polluted places water pearls form. Such places must be reground. To remove the water or a residual moisture, the parts must be dried in the oven.
Schon bei der Konstruktion der Strukturteile ist der für diese Bearbeitungsschritte notwendige Platzbedarf der Schleifmaschinen zu berücksichtigen. Besonders im Innenraum des Flügels ist die Erreichbarkeit enger sackartiger Räume mit der Schleifmaschine nur unter Schwierigkeiten gegeben.Already during the construction of the structural parts, the space required for these processing steps of the grinding machines must be considered. Especially in the interior of the wing, the accessibility of narrow sack-like spaces with the grinding machine is given only with difficulty.
Aufgabe der Erfindung ist es, ein Verfahren zur Vorbereitung von Kunststoffoberflächen, nämlich von Oberflächen von Halbzeugen aus kohlenstofffaserverstärktem Kunststoff, für die Weiterverarbeitung zu tragenden Strukturteilen mittels kleben, insbesondere zu Tragflächen von Fluggeräten, durch abrasiven Abtrag der Oberfläche vorzuschlagen, das die Gefahr der Durchtrennung von Fasern verringert aber gleichzeitig eine höhere Festigkeit der Klebung bei geringerer Nacharbeit ermöglicht.The object of the invention is to provide a method for the preparation of plastic surfaces, namely surfaces of semi-finished carbon fiber reinforced plastic, for further processing to structural parts by means of sticking, in particular to wings of aircraft, by abrasive removal of the surface to propose that the risk of separation of Fibers reduced but at the same time allows a higher strength of the bond with less rework.
Diese Aufgabe wird bei dem gattungsgemäßen Verfahren dadurch gelöst, daß der Abtrag durch Strahlen der Oberfläche mittels eines in einem gasförmigen Fluid verteilten Strahlmittels erfolgt. Misst man die Zeit, die benötigt wird, um die Oberfläche üblicherweise bis auf die Faser abzutragen, d. h. zu zerstören, so reicht überraschender Weise etwa der zehnte Teil dieser Zeit, um eine für die Klebung ausreichende Behandlung der Oberfläche zu erzielen. Die Qualität dieser Oberfläche übertrifft sogar die einer geschliffenen Oberfläche. Bei Bruchversuchen versagen die Bauteile nicht an der Klebestelle, sondern im Grundwerkstoff, was die Belastbarkeit der geklebten Strukturteile vorteilhaft erhöht.This object is achieved in the generic method in that the removal takes place by blasting the surface by means of a distributed in a gaseous fluid blasting agent. Measure the time it takes to get the surface down to the fiber ablate, ie destroy, surprisingly enough, about the tenth part of this time to achieve sufficient for the bonding treatment of the surface. The quality of this surface surpasses that of a polished surface. In fracture tests, the components fail not at the splice, but in the base material, which advantageously increases the capacity of the bonded structural parts.
Eine Verschmutzung der mechanisch gereinigten Oberfläche durch das Fluid wird mit Vorteil dadurch vermieden, daß das gasförmige Fluid getrocknete und entölte Luft ist.Contamination of the mechanically cleaned surface by the fluid is advantageously avoided by the fact that the gaseous fluid is dried and de-oiled air.
Besonders haltbare Verklebungen wurden erzielt, wenn als Strahlmittel ein scharfkantiges Korundkorn, vorzugsweise in einem Korngrößenbereich zwischen 0 und 90 µm, insbesondere zwischen 17 und 62 µm, verwendet wird.Particularly durable bonds have been achieved if a sharp-edged corundum grain, preferably in a particle size range between 0 and 90 μm, in particular between 17 and 62 μm, is used as the blasting medium.
Ein vorteilhaft gleichmäßiges Arbeitsergebnis lässt sich dadurch erreichen, das Strahlmittel mittels eines Niederdruckstrahls, vorzugsweise aus einem Druckkessel mit weniger als 2,5 bar, auf die zu behandelnde Oberfläche aufgebracht wird.An advantageous uniform work result can be achieved by the blasting agent is applied by means of a low-pressure jet, preferably from a pressure vessel with less than 2.5 bar, to the surface to be treated.
Demselben Zweck dient die Maßnahme, daß das Strahlmittel mittels einer Wirbelstrahldüse auf die zu behandelnde Oberfläche aufgebracht wird. Der umlaufende Strahl der Wirbelstrahldüse verhindert die Bildung nachteiliger sogenannter Hot Spots.The same purpose serves the measure that the blasting agent is applied by means of a vortex jet nozzle to the surface to be treated. The orbiting jet of the vortex jet nozzle prevents the formation of disadvantageous so-called hot spots.
Es reicht vorteilhaft eine optische Kontrolle des Arbeitsergebnisses aus, um eine ausreichende Qualität der Oberfläche sicherzustellen. Die Behandlung mit dem Strahlmittel solange erfolgt, bis eine fast wolkenfreie matte behandelte Oberfläche erreicht ist. Diese Qualität wird vorteilhaft entsprechend in Anlehnung an die DIN EN ISO 12944-4 SA 2,5 über das Arbeitergebnis definiert. Aufwendige Waterbreak-Tests mit Trocknungsschritten in aufwendigen weil großen Öfen können entfallen.Advantageously, optical control of the work result is sufficient to ensure sufficient surface quality. The treatment with the blasting agent is carried out until an almost cloud-free matte treated surface is reached. This quality is advantageous according to the DIN EN ISO 12944-4 SA 2.5 on the Work result defined. Elaborate water-break tests with drying steps in elaborate because large ovens can be omitted.
Zur Nachbearbeiten der behandelten Oberfläche reicht es überraschend aus, wenn die behandelte Oberfläche zur Entfernung des Strahlmittels mit getrockneter und ölfreier Druckluft abgeblasen wird. Noch etwaig in die Oberfläche tiefer eingebrachte einzelne Körner des Strahlmittels wirken überraschender Weise nicht nachteilig.For reworking the treated surface, it is surprisingly sufficient if the treated surface is blown off with dried and oil-free compressed air to remove the blasting medium. Surprisingly, any individual grains of the blasting medium introduced into the surface do not have a disadvantageous effect.
Für die Qualitätssicherung ist ausreichend, daß eine Qualitätskontrolle der behandelten Oberfläche durch Messung eines Oberflächenwiderstandes und/oder durch optische Kontrolle anhand einer Vergleichsprobe erfolgt.For quality assurance it is sufficient that a quality control of the treated surface is carried out by measuring a surface resistance and / or by visual inspection on the basis of a comparative sample.
Die Reproduzierbarkeit des Arbeitsergebnisses wird noch zusätzlich verbessert, wenn die Behandlung in einer klimatisierten, vorzugsweise zugluftfreier, Umgebung erfolgt.The reproducibility of the work result is further improved if the treatment takes place in an air-conditioned, preferably draft-free, environment.
Vor dem Transport der behandelten Teile zur Weiterverarbeitung ist vorgesehen, daß die Oberfläche für einen Transport vakuumverpackt wird. Eine solche Verpackung reicht bereits aus, um den erfindungsgemäßen Arbeitsgang aus der staubempfindlichen Bauteilmontage nach außen Zulieferern zu übertragen.Before transporting the treated parts for further processing, it is provided that the surface is vacuum-packed for transport. Such a package is already sufficient to transfer the operation according to the invention from the dust-sensitive component assembly to external suppliers.
Die statistische Stabilität des Arbeitsergebnisses mit seinen qualitativen Vorteilen wird noch verbessert, wenn das Strahlmittel nicht im Kreis geführt wird. Bei der sonst in der Strahltechnik üblichen Aufbereitung des Strahlmittels kann nicht ausgeschlossen werden, daß abgetragene Teilchen des Grundwerkstoffes im Strahlmittel verbleiben. Die Aufbereitung mittels Magnetabscheidern ist bei den mit dem erfindungsgemäßen Verfahren zu behandelnden Kunststoffen nicht möglich, da sie unmagnetisch sind. Sie müssen deshalb mittels Windsichten oder durch Flotation aufgearbeitet werden. Der Verzicht auf eine Aufbereitung erspart auch diese Verfahrensschritte.The statistical stability of the work result with its qualitative advantages is further improved if the abrasive is not circulated. In the otherwise usual in blasting processing of the blasting agent can not be excluded that ablated particles of the base material remain in the blasting agent. The preparation by means of magnetic separators is not possible with the plastics to be treated by the process according to the invention, since they are non-magnetic. You must therefore by means of Windscreens or be worked up by flotation. The absence of a preparation also saves these process steps.
Bei einem Halbzeug aus kohlenstofffaserverstärktem Kunststoff wird die Oberfläche für die Weiterverarbeitung zu tragenden Strukturteilen, insbesondere zu Tragflächen von Fluggeräten, durch eine Behandlung nach einem oder mehreren der vorstehenden Verfahren mittels eines in einem Strahl eines in einem gasförmigen Fluid verteilten Strahlmittels geformt.In a carbon fiber reinforced plastic semi-finished product, the surface for further processing into structural parts, in particular aircraft airfoils, is shaped by treatment in one or more of the above methods by means of a jet dispersed in a gaseous fluid.
Beispielsweise werden Prepregs im Druckstrahlverfahren erfindungsgemäß zum Verkleben z.B. mit Stringern auf Außenhäuten, Tiesverklebung, Rippen, Beschläge usw. vorbehandelt. Das Verfahren bewirkt einen geringen Materialabtrag, ohne das sich die Maßgenauigkeit des Bauteils beeinträchtigt wird. Es reinigt die Oberfläche durch einen mechanischen Abtrag der Oberfläche, der jedoch besonders vorteilhaft genau dosiert werden kann. Es besteht eine ca. 10-fache Sicherheit gegen Verletzung von Fasern des Kunststoffes. Die Strahlbehandlung wird trocken durchgeführt, wobei die Wirkung auf die Bauteiloberfläche wesentlich durch die Wahl des Strahlmittels bestimmt wird. Die Oberflächenrauhigkeit wird in erster Linie durch das Strahlmittel und den Druck bestimmt. Besonders gute Ergebnisse erzielte man bei Verwendung einer Wirbelstrahldüse der Typenbezeichnung Roto Soft Blast Mate Etc Roto Soft Strahldüsen DK 8,5/M, bei denen die Zuführung von Strahlmittel in Scalierung 2 cm Dosierventil eingestellt war. Die Speisung mit Druckluft erfolgte unter 2,5 bar bei Einsatz eines Druckstrahlkessels der Firma Blast Mate. Als Strahlmittel wurde Edelkorund weiß 0,07 bis 0 mm benutzt. Nachdem in Anlehnung an die DIN EN ISO 12944-4 SA 2,5 ein fast wolkenfreies Strahlbild erreicht wurde, erfolgte lediglich eine Entstaubung der Oberfläche mittels gereinigter Druckluft.For example, prepregs are pretreated by pressure blasting method according to the invention for bonding eg with stringers on outer skins, Tiesverklebung, ribs, fittings, etc. The method causes a low material removal, without affecting the dimensional accuracy of the component is impaired. It cleans the surface by a mechanical removal of the surface, which can be dosed but particularly advantageous. There is an approx. 10-fold safety against damage to fibers of the plastic. The blast treatment is carried out dry, the effect on the component surface being determined essentially by the choice of blasting medium. The surface roughness is determined primarily by the blasting agent and the pressure. Particularly good results were obtained when using a vortex jet nozzle of the type Roto Soft Blast Mate Etc Roto Soft jet nozzles DK 8.5 / M, in which the supply of blasting medium was set in Scalierung 2 cm metering valve. The supply of compressed air was under 2.5 bar using a blast jet pressure Blast Mate. The abrasive used was white corundum 0.07 to 0 mm. After an almost cloud-free spray pattern was achieved in accordance with DIN EN ISO 12944-4 SA 2.5, only dust was removed from the surface by means of purified compressed air.
Im Ergebnis übertraf die Qualität der so erzeugten Oberfläche die bisher durch Schleifen erzielten Qualitäten bei weitem.As a result, the quality of the surface thus produced far exceeded the grades achieved so far by grinding.
Claims (11)
- Method for preparing plastics surfaces, namely surfaces of semi-finished products made of carbon fibre reinforced plastics materials, for further processing to produce load-bearing structural parts by means of adhesion, in particular load-bearing surfaces of aircraft, via abrasive erosion of the surface, characterised in that the erosion by blasting takes place by means of a blasting agent distributed in a gaseous fluid.
- Method for preparing plastics surfaces according to claim 1, characterised in that the gaseous fluid is dried air from which oil has been removed.
- Method for preparing plastics surfaces according to either claim 1 or claim 2, characterised in that a sharp-edged corundum grain, preferably in a grain size range between 0 and 90 µm, in particular between 17 and 62 µm, is used as the blasting agent.
- Method for preparing plastics surfaces according to any one of claims 1, 2 or 3, characterised in that the blasting agent is applied to the surface to be treated by means of a low-pressure jet, preferably from a pressure chamber at less than 2.5 bar.
- Method for preparing plastics surfaces according to any one of claims 1, 2, 3 or 4, characterised in that the blasting agent is applied to the surface to be treated by means of an eddy jet nozzle.
- Method for preparing plastics surfaces according to any one of claims 1, 2, 3, 4 or 5, characterised in that a treatment with the blasting agent takes place for as long as necessary to achieve an almost cloud-free, matt treated surface.
- Method for preparing plastics surfaces according to any one or more of the preceding claims, characterised in that the treated surface is blown off with dried and oil-free compressed air, in order to remove the blasting agent.
- Method for preparing plastics surfaces according to any one or more of the preceding claims, characterised in that the quality of the treated surface is inspected by measurement of a surface resistance and/or by optical inspection using a comparison sample.
- Method for preparing plastics surfaces according to any one or more of the preceding claims, characterised in that the treatment takes place in an air-conditioned, preferably draught-free environment.
- Method for preparing plastics surfaces according to any one or more of the preceding claims, characterised in that the surface is vacuum-packed for transport.
- Method for preparing plastics surfaces according to any one or more of the preceding claims, characterised in that the blasting agent is not recirculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SI200331877T SI1592535T1 (en) | 2003-01-22 | 2003-11-05 | Method for preparing surfaces of carbon fiber-reinforced plastics for further processing into supporting structural parts |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10302594 | 2003-01-22 | ||
| DE10302594A DE10302594A1 (en) | 2003-01-22 | 2003-01-22 | Surface preparation of plastic, in particular carbon fiber reinforced plastic, surfaces, involves use of a gas jet containing abrasive |
| PCT/DE2003/003675 WO2004067229A1 (en) | 2003-01-22 | 2003-11-05 | Method for preparing surfaces of carbon fiber-reinforced plastics for further processing into supporting structural parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1592535A1 EP1592535A1 (en) | 2005-11-09 |
| EP1592535B1 true EP1592535B1 (en) | 2010-09-22 |
Family
ID=32602895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03795730A Expired - Lifetime EP1592535B1 (en) | 2003-01-22 | 2003-11-05 | Method for preparing surfaces of carbon fiber-reinforced plastics for further processing into supporting structural parts |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20050130565A1 (en) |
| EP (1) | EP1592535B1 (en) |
| AT (1) | ATE482054T1 (en) |
| DE (2) | DE10302594A1 (en) |
| DK (1) | DK1592535T3 (en) |
| ES (1) | ES2348707T3 (en) |
| PT (1) | PT1592535E (en) |
| SI (1) | SI1592535T1 (en) |
| WO (1) | WO2004067229A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008022649A1 (en) | 2008-05-07 | 2009-11-12 | Airbus Deutschland Gmbh | Process and apparatus for preparing surfaces of carbon fiber reinforced plastics |
| RU2457933C2 (en) * | 2010-10-28 | 2012-08-10 | Государственное образовательное учреждение высшего профессионального образования "Уфимский государственный нефтяной технический университет" | Abrasive-jet cleaning of surfaces from organic dirt |
| DE102017220032A1 (en) | 2017-11-10 | 2019-05-16 | Premium Aerotec Gmbh | METHOD FOR TREATING A SURFACE OF A FIBER COMPOSITE COMPONENT |
| CN111390654A (en) * | 2020-03-30 | 2020-07-10 | 中国科学院宁波材料技术与工程研究所 | A kind of treatment method of carbon fiber resin matrix composite material surface |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3691000A (en) * | 1971-03-10 | 1972-09-12 | Celanese Corp | Glass fiber reinforced composite article exhibiting enhanced longitudinal tensile and compressive moduli |
| US3828520A (en) * | 1973-04-04 | 1974-08-13 | Substrate Inc | Vacuum packaging method and platen therefor |
| DE3026650A1 (en) * | 1980-07-14 | 1982-04-08 | Manfred Meyer GmbH, 7000 Stuttgart | Pretreating plastics surfaces before coating - by bombardment with accelerated metal or mineral particles to improve bond |
| US4731125A (en) * | 1984-04-19 | 1988-03-15 | Carr Lawrence S | Media blast paint removal system |
| US4787179A (en) * | 1987-08-10 | 1988-11-29 | Lewis Richard E | Abrasive blasting containment system |
| DE3802042A1 (en) * | 1988-01-25 | 1989-07-27 | Thera Ges Fuer Patente | METHOD FOR PREPARING A SUBSTRATE SURFACE FOR CONNECTING WITH PLASTIC BY APPLYING A SILICONE-CONTAINING LAYER AND USE OF SILICON-CONTAINING MATERIAL |
| DE3814192A1 (en) * | 1988-04-27 | 1989-11-09 | Schlick Roto Jet Masch | Process and apparatus for removing fittings from plastic laminates |
| US5063015A (en) * | 1989-03-13 | 1991-11-05 | Cold Jet, Inc. | Method for deflashing articles |
| GB9020204D0 (en) * | 1990-09-15 | 1990-10-24 | Pain B R K | Surface treatment |
| US5431958A (en) * | 1992-03-09 | 1995-07-11 | Sharp Kabushiki Kaisha | Metalorganic chemical vapor deposition of ferroelectric thin films |
| DE4226789A1 (en) * | 1992-08-13 | 1994-02-17 | Sigri Great Lakes Carbon Gmbh | Fiber-reinforced plastic roller with outer, wear-resistant, filler-containing plastic layer |
| DE4303188C1 (en) * | 1993-02-04 | 1994-05-26 | Kies Karl Heinz | Jet nozzle for sand blasting appts. working on flat even surface - comprises tubular housing couplable to hose and in which a nozzle head is rotatable coated |
| JPH0796977A (en) * | 1993-06-08 | 1995-04-11 | Ajinomoto Co Inc | Double packing material for easily oxidized substance |
| DE19517570A1 (en) * | 1995-05-12 | 1996-11-14 | Guenter Ott | Surface preparation method using jet for visual effect on e.g. plywood |
| EP0910267A1 (en) * | 1996-06-13 | 1999-04-28 | Strix Limited | Electric liquid heating vessels |
| DE19640945A1 (en) * | 1996-10-04 | 1998-04-16 | Polygram Manufacturing & Distr | Method and device for mechanically removing a foreign matter coating from a base material |
| DE19729891B4 (en) * | 1997-07-12 | 2006-12-21 | AHC-Oberflächentechnik GmbH & Co. OHG | Method for targeted roughening of plastic surfaces and apparatus for carrying out the method |
| JPH11198034A (en) * | 1998-01-16 | 1999-07-27 | Nippei Toyama Corp | Grinding method and grinding machine |
| FR2775919B1 (en) * | 1998-03-13 | 2000-06-02 | Virsol | PROCESS OF "MECANO-CHEMICAL" TREATMENT OF A MATERIAL |
| DE29820577U1 (en) * | 1998-11-18 | 1999-01-28 | Zander Umwelt GmbH, 91080 Spardorf | Grinding cabin arrangement for installation in buildings |
| DE19943005A1 (en) * | 1999-09-09 | 2001-05-23 | Heinrich Gruber | Process for cleaning the surface of a plastic object |
-
2003
- 2003-01-22 DE DE10302594A patent/DE10302594A1/en not_active Ceased
- 2003-11-05 AT AT03795730T patent/ATE482054T1/en active
- 2003-11-05 ES ES03795730T patent/ES2348707T3/en not_active Expired - Lifetime
- 2003-11-05 EP EP03795730A patent/EP1592535B1/en not_active Expired - Lifetime
- 2003-11-05 DK DK03795730.5T patent/DK1592535T3/en active
- 2003-11-05 US US10/508,290 patent/US20050130565A1/en not_active Abandoned
- 2003-11-05 SI SI200331877T patent/SI1592535T1/en unknown
- 2003-11-05 WO PCT/DE2003/003675 patent/WO2004067229A1/en active Application Filing
- 2003-11-05 DE DE50313119T patent/DE50313119D1/en not_active Expired - Lifetime
- 2003-11-05 PT PT03795730T patent/PT1592535E/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ES2348707T3 (en) | 2010-12-13 |
| DE10302594A1 (en) | 2004-07-29 |
| US20050130565A1 (en) | 2005-06-16 |
| SI1592535T1 (en) | 2010-11-30 |
| ATE482054T1 (en) | 2010-10-15 |
| WO2004067229A1 (en) | 2004-08-12 |
| PT1592535E (en) | 2010-10-12 |
| EP1592535A1 (en) | 2005-11-09 |
| DK1592535T3 (en) | 2010-12-13 |
| DE50313119D1 (en) | 2010-11-04 |
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