US20120152461A1 - Method for reinforcing a fibre composite component and a vacuum mat and arrangement for producing a reinforced fibre composite component - Google Patents
Method for reinforcing a fibre composite component and a vacuum mat and arrangement for producing a reinforced fibre composite component Download PDFInfo
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- US20120152461A1 US20120152461A1 US13/408,660 US201213408660A US2012152461A1 US 20120152461 A1 US20120152461 A1 US 20120152461A1 US 201213408660 A US201213408660 A US 201213408660A US 2012152461 A1 US2012152461 A1 US 2012152461A1
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- Prior art keywords
- vacuum mat
- vacuum
- fibre composite
- composite component
- mat
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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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
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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
- B29C33/40—Plastics, e.g. foam or rubber
- B29C33/405—Elastomers, e.g. rubber
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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
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/46—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles using fluid pressure
-
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/001—Producing wall or panel-like structures, e.g. for hulls, fuselages, or buildings
- B29D99/0014—Producing wall or panel-like structures, e.g. for hulls, fuselages, or buildings provided with ridges or ribs, e.g. joined ribs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2063/00—Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2707/00—Use of elements other than metals for preformed parts, e.g. for inserts
- B29K2707/04—Carbon
Definitions
- the present invention relates to a method for reinforcing a fibre composite component, in particular for aviation and space flight, and to a vacuum mat and an arrangement for producing a reinforced fibre composite component of this type.
- CFRP carbon fibre plastics material
- the cross section of T-stringers is composed of the base and the bar.
- the base forms the connecting surface to the skin shell.
- skin shells reinforced with stringers for example T-stringers is widespread in aircraft construction, particularly in the vacuum infusion process for introducing a matrix, for example an epoxy resin, into fibre semi-finished products.
- infusion processes can be cost-effective as they allow the use of more economic fibre semi-finished products.
- fibre semi-finished products is understood as meaning woven fabrics, interlaid scrims and fibre mats. These are provided with a matrix, for example an epoxy resin, and then cured, for example in an autoclave.
- drapable single-use polyamide films are presently used to form so-called vacuum bags.
- the wrapping process of a component is carried out completely by hand which, particularly in the case of reinforcing elements, for example the above-mentioned stringers, is very time consuming, because the vacuum film has to be guided over these reinforcing elements while precisely following the contour thereof in order to prevent distortion of the component.
- the vacuum film has to be sealed, which is performed by applying appropriate sealing tapes, also by hand. Due to the manual process management, the reproducibility suffers from considerable unreliability, such that for example for positioning reinforcing elements on a fibre composite component, great tolerances are required which can lead to an increase in weight of the component. Faulty vacuum superstructures can ultimately result in rejection of the component.
- the single-use film per se can be used only with pre-cured T-shaped reinforcing elements or other reinforcing elements. Uncured T-shaped reinforcing elements or other reinforcing elements require an additional support inside or outside the vacuum structure. Furthermore, in this manufacturing technology, wet stringers, i.e. uncured stringers have to be milled off after curing to their respective specified size. After curing, a considerable manual effort is required in order to remove the single-use film and the sealing tape.
- the object of the present invention is to provide a method for reinforcing a fibre composite component as well as a vacuum mat and an arrangement for producing a reinforced fibre composite component in order to overcome or considerably reduce the above-mentioned disadvantages.
- a method for reinforcing a fibre composite component for aviation and space flight in which a vacuum mat is configured with at least one receiving portion for the reproducible accommodation of at least one reinforcing element.
- the at least one reinforcing element is introduced into this receiving portion of the vacuum mat.
- the vacuum mat is then reproducibly applied with at least one introduced reinforcing element to the fibre composite component which is to be reinforced, in a sealed manner to form a mould portion which is then cured to connect the at least one reinforcing element to the fibre composite component. Thereafter, the vacuum mat is removed from the reinforced fibre composite component and prepared to be reused.
- a vacuum mat is provided to produce a reinforced fibre composite component for aviation and space flight.
- the vacuum mat has at least one receiving portion for receiving at least one reinforcing element.
- a self-sealing portion is arranged peripherally on the vacuum mat to seal off the vacuum mat from the atmosphere when contacting an associated contact surface.
- the vacuum mat has at least one contact portion for cooperating with an associated vacuum mat transportation means.
- An arrangement for producing a reinforced fibre composite component for aviation and space flight is also provided.
- the fibre composite component to be reinforced is supported on a base plate.
- the arrangement also comprises a vacuum mat which has at least one receiving portion for receiving at least one reinforcing element.
- the vacuum mat can be transported with at least one introduced reinforcing element into a predetermined position relative to the fibre composite component to be reinforced by a vacuum mat transportation means.
- the base plate and the vacuum mat transportation means have mutually corresponding centring means for a reproducible positioning of the vacuum mat relative to the fibre composite component to be reinforced.
- the base plate and the vacuum mat have mutually corresponding sealing means for an encircling sealing of the vacuum mat from the atmosphere.
- the present invention has the advantage over the approaches mentioned at the outset that the expenditure of time is greatly reduced because a large amount of the manual work is omitted. Furthermore, an increased reproducibility and positioning accuracy is achieved which reduces the risk of rejects and the error probability.
- the vacuum mat can be reused and reduces the material requirement.
- a basic idea of the invention is to use a reusable silicone vacuum bag in the form of a vacuum mat. This is produced with at least one receiving portion with a recess by means of a moulding component for shaping the geometric dimensions of the reinforcing element to be received.
- a moulding component for shaping the geometric dimensions of the reinforcing element to be received.
- an already preformed “pocket” is provided into which rigid (precured or cured) or flexible (uncured) reinforcing elements, for example T-stringers can be introduced and can be positioned reproducibly together with the vacuum mat on the fibre composite component to be reinforced.
- the contour-accurate configuration of the “pockets”, i.e. the recesses for the reinforcing elements in the vacuum mat makes it possible to produce so-called “net shape” stringers, which obviate milling the component after curing.
- the vacuum mat is transported with the reinforcements introduced therein by a vacuum mat transportation means, suitable grippers of the transportation means cooperating with corresponding contact portions of the vacuum mat to ensure a simple and gentle picking up and setting down of the vacuum mat.
- the contact portions are preferably arranged on the receiving portions of the vacuum mat and can have components which allow a cooperation with the grippers in a mechanical, pneumatic and/or electromagnetic manner.
- a cooperation with vacuum grippers is achieved, for example by a specific rigidity of the contact portion.
- the contact portion can be provided, for example with seats corresponding to pegs of the grippers.
- magnetisable portions for example are present in the receiving portions which can easily be grasped and released by electromagnetic grippers by the connection and disconnection thereof, in order to allow a rapid lifting and setting down.
- the vacuum mat transportation means also cooperates with suitable centring means of a base plate onto which the fibre composite component to be reinforced is positioned and over which the vacuum mat is applied.
- the centring means can be configured, for example as centring pins and centring holes on the edge of the base plate. This achieves a consistently identical, i.e. a reproducible positioning of the vacuum mat and thus of the reinforcing elements of the fibre composite component.
- the vacuum mat has a self-sealing portion arranged peripherally for sealing the vacuum mat from the atmosphere when contacting an associated contact surface.
- the sealing portion can preferably have a V-shaped sunk key, in which case a simple self-sealing can take place.
- the vacuum mat can be charged with air or a gas.
- closable air supply means are preferably arranged on the vacuum mat, through which the air or gas is blown in between the vacuum mat and its support. This measure advantageously facilitates the detachment of the vacuum mat.
- the at least one recess is provided with at least one incision in the extension of its longitudinal direction for removal from the mould, because during removal from the mould when air or gas is blown in, the incision widens and facilitates a gaping of the recess to release the reinforcing element arranged therein, thereby reducing the error probability.
- the vacuum mat is suitable for both T and ⁇ or I stringers. It can also be used on U-stringer profiles, in which case, however, the positioning procedure of the stringer elements on the fibre composite component is omitted, since U profiles are largely a part of the base laminate of the fibre composite component and a T-profile is formed from two sides of the U in each case.
- FIG. 1 is a schematic cross-sectional view of a mould portion of a fibre composite component with a first embodiment of a vacuum mat according to the invention with a receiving portion;
- FIG. 2 is a cross-sectional view of the receiving portion along line A-A shown in FIG. 1 ;
- FIG. 3 is a perspective plan view of an exemplary fibre composite component with mould portions with a second embodiment of the vacuum mat according to the invention
- FIG. 4 is a schematic cross-sectional view of three mould portions of the fibre composite component with the second embodiment of the vacuum mat of the invention according to FIG. 3 ;
- FIG. 5 is a schematic cross-sectional view of the receiving portion of the first or second embodiment of the vacuum mat according to the invention with a first embodiment of a vacuum mat transportation means;
- FIG. 6 is a schematic cross-sectional view of a receiving portion of a third embodiment of the vacuum mat according to the invention with a second embodiment of the vacuum mat transportation means;
- FIG. 7 is a schematic cross-sectional view of a receiving portion of a fourth embodiment of the vacuum mat according to the invention with a third embodiment of the vacuum mat transportation means;
- FIG. 8 is a schematic, enlarged view of a retaining portion characterised in FIG. 7 by an oval.
- FIG. 9 is a schematic cross-sectional view of an exemplary arrangement according to the invention for the production of a reinforced fibre composite component.
- FIG. 1 is a schematic cross-sectional view of a mould portion 2 of a fibre composite component portion 3 of a fibre composite component 1 (see FIG. 3 ) with a first embodiment of a vacuum mat 5 according to the invention with a receiving portion 6 .
- the fibre composite component portion 3 is arranged here on a base plate 24 of a production arrangement (see FIG. 9 ), which is described in more detail further below, and is provided for reinforcing by a reinforcing element 4 , in this case a T-stringer by a vacuum infusion process in the illustrated mould portion 2 .
- the reinforcing element 4 was previously introduced in a different location into a recess 10 , compatible with the reinforcing element 4 , of the receiving portion 6 of the vacuum mat 5 and is completely enclosed by said recess 10 .
- the vacuum mat 5 is produced from silicone.
- the silicone material as a receiving body 9 surrounds the reinforcing element 4 .
- the reinforcing element 4 can be pre-cured while it is unhardened, i.e. flexible, or it can be cured. It is supported by the receiving body 9 .
- the vacuum mat 5 Due to the nature of the material of the vacuum mat 5 (silicone, very soft and flexible), the vacuum mat 5 then has to be applied with the inserted reinforcing element 4 onto the fibre composite component portion 3 , which is to be reinforced by the reinforcing element 4 , by a suitable vacuum mat transportation device 12 which is described below in detail, such that the lower portion of the reinforcing element 3 rests directly on the fibre composite component portion 3 .
- the fibre composite component portion 3 and the reinforcing element 4 are covered by the vacuum mat 5 which seals off the structure from the atmosphere by a self-sealing portion 7 arranged peripherally on the edge of the vacuum mat.
- the sealing portion 7 has a V-shaped sunk key 8 which cooperates here in a groove, corresponding therewith, in the base plate 24 .
- the recess 10 in the receiving portion 6 of the vacuum mat 5 is configured as a preformed “pocket” by a dummy component during the production of the vacuum mat.
- the dummy component is an originally-sized replica of the reinforcing element 4 , as a result of which all the geometric characteristics of the reinforcing component 4 which is received later on in the recess 10 are reproduced.
- the recess 10 is extended in its longitudinal direction by an incision 11 , as can be seen in FIG. 2 , which is a cross-sectional view of the receiving portion 6 along line A-A of FIG. 1 .
- This incision 11 has the advantage that after the mould portion 2 has cured, a removal from the mould of the vacuum mat 5 is made easier, i.e. when the vacuum mat 5 is lifted up from the reinforcing element 4 which is then connected to the fibre composite component portion 3 . This will be described in more detail further below.
- FIG. 1 shows in a perspective plan view of an exemplary fibre composite component 1 with mould portions 2 with a second embodiment of the vacuum mat 5 according to the invention.
- FIG. 3 six reinforcing elements 4 are arranged on the fibre composite component portion 3 of the fibre composite component 1 and are covered by the vacuum mat 5 which, in this case, has a recess 10 for each reinforcing element 4 .
- the vacuum mat 5 is fitted with closable air supply means 23 , through which air or gas is blown in between the vacuum mat 5 and the fibre composite component portion 3 when the vacuum mat 5 is removed from the mould in order to facilitate the removal from the mould.
- the incisions show in FIG. 2 , are widened by the air which is blown in and thus allow the receiving body 9 to be detached more easily from the respective reinforcing element 4 .
- FIG. 4 is a schematic cross-sectional view of three mould portions 2 of the fibre composite component 1 with the second embodiment of the vacuum mat 5 of the invention according to FIG. 3 , the closable air supply means 23 being configured as connecting pipes.
- a closing ability can be achieved manually, pneumatically or electrically/electromagnetically by valves (not shown).
- These air supply means 23 can also be used for applying a vacuum required for the vacuum infusion.
- the vacuum mat 5 is transported by a vacuum mat transportation device 12 .
- the vacuum mat transportation device 12 has grippers 13 for handling the vacuum mat 5 .
- a first embodiment of a gripper 13 is shown schematically in FIG. 5 .
- the gripper 13 is equipped with two gripper arms 14 , the upper ends of which are coupled in a joint in scissor-form such that they can pivot backwards and forwards in the direction of the arrows.
- Their lower ends are provided with vacuum gripper elements 15 which cooperate with the outside of the receiving body 9 of the receiving portion 6 , shown here, of the vacuum mat 5 .
- the receiving portion 6 has here reinforced contact portions 22 for the vacuum gripper elements 15 .
- the gripper arms 14 can be pivoted, for example by a pneumatic or electromotive drive (not shown) or the like. To raise the vacuum mat 5 , said gripper arms pivot towards the receiving portion 6 , draw it up by suction and transport the vacuum mat 5 to predetermined positions.
- FIG. 6 is a schematic cross-sectional view of a receiving portion 6 of a third embodiment of the vacuum mat 5 according to the invention with a second embodiment of the vacuum mat transportation means 12 which has electromagnetic gripper elements 16 which cooperate with magnetisable components 17 in the contact portions 22 in the receiving body 9 of the receiving portion 6 of the vacuum mat 5 .
- the operation is easy to imagine.
- FIG. 7 shows a further mechanical gripper configuration, similar to FIGS. 5 and 6 , in a schematic cross-sectional view of a receiving portion 6 of a fourth embodiment of the vacuum mat 5 according to the invention with a third embodiment of the vacuum mat transportation means 12 .
- the lower ends of the gripper arms 14 are fitted with mechanical gripper elements 19 with, in this case, a rectangular body (for example a cuboid) which have in their longitudinal direction (arrows) adjustable pegs 20 , as illustrated in FIG. 8 in an enlarged schematic view of the region marked by an oval in FIG. 7 .
- the mechanical gripper elements 19 are introduced into seats 21 of engaging elements 18 in the contact portions 22 on the receiving portions 6 of the vacuum mat 5 for gripping the vacuum mat 5 , the adjustable pegs 20 being retracted.
- the pegs 20 are moved out into corresponding recesses to produce a locking effect.
- the pegs 20 can be adjusted, for example by an electric motor, electromagnetically or pneumatically.
- the pegs 20 can be drawn in pneumatically against a spring pressure and, upon reaching their recesses, can be locked therein by the spring pressure.
- Further mechanical gripper means are of course possible. Combinations of the examples shown here are also conceivable.
- FIG. 9 is a schematic cross-sectional view of an exemplary arrangement according to the invention for the production of a reinforced fibre composite component 1 with the above-mentioned vacuum mat transportation means 12 .
- the vacuum mat transportation means 12 can be of a modular configuration, for example, so that it can be easily adapted to fibre composite components 1 with different dimensions, it being possible for the same gripper means 13 to be used, for example. However, combinations are also conceivable.
- the fibre composite component 1 positioned on the base plate 24 is to be reinforced with four reinforcing elements 4 which were previously received in the respective recesses 10 in the vacuum mat 5 , as described above.
- This fitting procedure can be carried out, for example in a separate room or even next to the base plate 24 .
- the vacuum mat transportation device 12 grasps the vacuum mat 5 equipped with the reinforcing elements 4 by the gripper means, as stated above and transports it to the base plate 24 shown here in FIG. 9 . This can be performed in different ways, depending on the situation, for example by a crane mechanism or using a rail system.
- the base plate 24 and the vacuum mat transportation means 12 have in this case, on the edge of this component device, centring means 25 , for example centring pins on the vacuum mat transportation means 12 and corresponding seats in the base plate 24 .
- the gripper means 13 are opened, as described above and the vacuum mat transportation device 12 is moved to the side. Sealing is carried out here, as described above, by a self-sealing V-shaped sunk key seal. The fibre composite component 1 can then be cured. Thereafter, the vacuum mat transportation device 12 is again positioned over the vacuum mat 5 to raise the vacuum mat 5 , as described above.
- the arrangement can comprise a control means which is connected to the centring means 25 , to drive means for moving the vacuum mat transportation device 12 , to drive means for the gripper means 13 and to further indicating and sensor means. Consequently, the production of the reinforced fibre composite component 1 is automated such that a high reproducibility is achieved with a very low error probability, the vacuum mat 5 being reusable.
- the vacuum mat 5 can be used not only for the stringers, i.e. for the reinforcing elements 4 , but also for so-called stringer retaining profiles. Thus, a great versatility with an advantageous reusability is provided.
- a vacuum mat 5 with at least one receiving portion 6 is configured for reproducibly receiving at least one reinforcing element 4 .
- the at least one reinforcing element 4 is introduced into the at least one receiving portion 6 of the vacuum mat 5 .
- the vacuum mat 5 with at least one introduced reinforcing element 4 is applied in a reproducible manner to the fibre composite component 1 , to be reinforced, in a sealed manner to form a mould portion 2 and at least the formed mould portion 2 is cured to connect the at least one reinforcing element 4 to the fibre composite component.
- the vacuum mat 5 is then removed from the reinforced fibre composite component 1 and is prepared to be reused.
- a corresponding vacuum mat 5 and an arrangement for producing a corresponding reinforced fibre composite component 1 is
Abstract
In a method for reinforcing a fibre composite component for aviation and space flight, a vacuum mat is configured with at least one receiving portion for reproducibly receiving at least one reinforcing element. The at least one reinforcing element is introduced into the at least one receiving portion of the vacuum mat. The vacuum mat with at least one introduced reinforcing element is applied reproducibly in a sealed manner to the fibre composite component to be reinforced to form a mould portion and at least the formed mould portion is cured to connect the at least one reinforcing element to the fibre composite component. The vacuum mat is then removed from the reinforced fibre composite component so that the vacuum mat can be reused.
Description
- This application is a divisional of and claims priority to U.S. application Ser. No. 12/816,853, filed Jun. 16, 2010, which is a continuation of PCT/EP2008/065699 which claims the benefit of U.S. Provisional Application No. 61/008,401, filed Dec. 20, 2007 and German Patent Application No. 10 2007 061 431.6, filed Dec. 20, 2007, the entire disclosures of which are herein incorporated by reference.
- The present invention relates to a method for reinforcing a fibre composite component, in particular for aviation and space flight, and to a vacuum mat and an arrangement for producing a reinforced fibre composite component of this type. Although the present invention and the problem on which it is based can be applied to any fibre composite components, in the following they will be described in detail in respect of planar, stringer-reinforced carbon fibre plastics material (CFRP) components (also called fibre composite components), for example skin shells of an aircraft.
- It is generally known to reinforce CFRP skin shells with CFRP stringers to withstand the high stresses in the field of aviation with the lowest possible additional weight. In this respect, different types of stringers are used, for example T, Ω or I stringers.
- The cross section of T-stringers is composed of the base and the bar. The base forms the connecting surface to the skin shell. The use of skin shells reinforced with stringers, for example T-stringers is widespread in aircraft construction, particularly in the vacuum infusion process for introducing a matrix, for example an epoxy resin, into fibre semi-finished products. Compared to other known methods for the production of fibre composite components, for example the prepreg process, infusion processes can be cost-effective as they allow the use of more economic fibre semi-finished products.
- The term “fibre semi-finished products” is understood as meaning woven fabrics, interlaid scrims and fibre mats. These are provided with a matrix, for example an epoxy resin, and then cured, for example in an autoclave.
- In the vacuum infusion process, drapable single-use polyamide films are presently used to form so-called vacuum bags. The wrapping process of a component is carried out completely by hand which, particularly in the case of reinforcing elements, for example the above-mentioned stringers, is very time consuming, because the vacuum film has to be guided over these reinforcing elements while precisely following the contour thereof in order to prevent distortion of the component. In addition, to achieve tightness against the atmosphere, the vacuum film has to be sealed, which is performed by applying appropriate sealing tapes, also by hand. Due to the manual process management, the reproducibility suffers from considerable unreliability, such that for example for positioning reinforcing elements on a fibre composite component, great tolerances are required which can lead to an increase in weight of the component. Faulty vacuum superstructures can ultimately result in rejection of the component.
- The single-use film per se can be used only with pre-cured T-shaped reinforcing elements or other reinforcing elements. Uncured T-shaped reinforcing elements or other reinforcing elements require an additional support inside or outside the vacuum structure. Furthermore, in this manufacturing technology, wet stringers, i.e. uncured stringers have to be milled off after curing to their respective specified size. After curing, a considerable manual effort is required in order to remove the single-use film and the sealing tape.
- Against this background, the object of the present invention is to provide a method for reinforcing a fibre composite component as well as a vacuum mat and an arrangement for producing a reinforced fibre composite component in order to overcome or considerably reduce the above-mentioned disadvantages.
- This object is achieved according to the invention by a method which has the features of
claim 1, by a vacuum mat with the features ofclaim 7 and by an arrangement with the features ofclaim 16. - According thereto, a method for reinforcing a fibre composite component for aviation and space flight is provided in which a vacuum mat is configured with at least one receiving portion for the reproducible accommodation of at least one reinforcing element. The at least one reinforcing element is introduced into this receiving portion of the vacuum mat. The vacuum mat is then reproducibly applied with at least one introduced reinforcing element to the fibre composite component which is to be reinforced, in a sealed manner to form a mould portion which is then cured to connect the at least one reinforcing element to the fibre composite component. Thereafter, the vacuum mat is removed from the reinforced fibre composite component and prepared to be reused.
- Furthermore, a vacuum mat is provided to produce a reinforced fibre composite component for aviation and space flight. The vacuum mat has at least one receiving portion for receiving at least one reinforcing element. A self-sealing portion is arranged peripherally on the vacuum mat to seal off the vacuum mat from the atmosphere when contacting an associated contact surface. Furthermore, the vacuum mat has at least one contact portion for cooperating with an associated vacuum mat transportation means.
- An arrangement for producing a reinforced fibre composite component for aviation and space flight is also provided. The fibre composite component to be reinforced is supported on a base plate. The arrangement also comprises a vacuum mat which has at least one receiving portion for receiving at least one reinforcing element. The vacuum mat can be transported with at least one introduced reinforcing element into a predetermined position relative to the fibre composite component to be reinforced by a vacuum mat transportation means. The base plate and the vacuum mat transportation means have mutually corresponding centring means for a reproducible positioning of the vacuum mat relative to the fibre composite component to be reinforced. Furthermore, the base plate and the vacuum mat have mutually corresponding sealing means for an encircling sealing of the vacuum mat from the atmosphere.
- Thus, the present invention has the advantage over the approaches mentioned at the outset that the expenditure of time is greatly reduced because a large amount of the manual work is omitted. Furthermore, an increased reproducibility and positioning accuracy is achieved which reduces the risk of rejects and the error probability. The vacuum mat can be reused and reduces the material requirement. Advantageous embodiments and improvements of the present invention are provided in the subclaims.
- A basic idea of the invention is to use a reusable silicone vacuum bag in the form of a vacuum mat. This is produced with at least one receiving portion with a recess by means of a moulding component for shaping the geometric dimensions of the reinforcing element to be received. Thus, an already preformed “pocket” is provided into which rigid (precured or cured) or flexible (uncured) reinforcing elements, for example T-stringers can be introduced and can be positioned reproducibly together with the vacuum mat on the fibre composite component to be reinforced. The contour-accurate configuration of the “pockets”, i.e. the recesses for the reinforcing elements in the vacuum mat makes it possible to produce so-called “net shape” stringers, which obviate milling the component after curing.
- The vacuum mat is transported with the reinforcements introduced therein by a vacuum mat transportation means, suitable grippers of the transportation means cooperating with corresponding contact portions of the vacuum mat to ensure a simple and gentle picking up and setting down of the vacuum mat. The contact portions are preferably arranged on the receiving portions of the vacuum mat and can have components which allow a cooperation with the grippers in a mechanical, pneumatic and/or electromagnetic manner.
- A cooperation with vacuum grippers is achieved, for example by a specific rigidity of the contact portion. For a mechanical cooperation, the contact portion can be provided, for example with seats corresponding to pegs of the grippers. For an electromagnetic cooperation, magnetisable portions, for example are present in the receiving portions which can easily be grasped and released by electromagnetic grippers by the connection and disconnection thereof, in order to allow a rapid lifting and setting down.
- The vacuum mat transportation means also cooperates with suitable centring means of a base plate onto which the fibre composite component to be reinforced is positioned and over which the vacuum mat is applied. The centring means can be configured, for example as centring pins and centring holes on the edge of the base plate. This achieves a consistently identical, i.e. a reproducible positioning of the vacuum mat and thus of the reinforcing elements of the fibre composite component. When the vacuum mat has been brought into position, which can be indicated to a control means, for example via limit switches in the centring means, the grippers are opened and the vacuum mat transportation means is moved to the side, which can be performed, for example by a crane or a suitable rail structure.
- The vacuum mat has a self-sealing portion arranged peripherally for sealing the vacuum mat from the atmosphere when contacting an associated contact surface. The sealing portion can preferably have a V-shaped sunk key, in which case a simple self-sealing can take place.
- During the removal of the vacuum mat from the fibre composite component after at least the formed mould portion has cured to connect the at least one reinforcing element to the fibre composite component, the vacuum mat can be charged with air or a gas. For this purpose, closable air supply means are preferably arranged on the vacuum mat, through which the air or gas is blown in between the vacuum mat and its support. This measure advantageously facilitates the detachment of the vacuum mat.
- Furthermore, it is advantageous that the at least one recess is provided with at least one incision in the extension of its longitudinal direction for removal from the mould, because during removal from the mould when air or gas is blown in, the incision widens and facilitates a gaping of the recess to release the reinforcing element arranged therein, thereby reducing the error probability.
- The vacuum mat is suitable for both T and Ω or I stringers. It can also be used on U-stringer profiles, in which case, however, the positioning procedure of the stringer elements on the fibre composite component is omitted, since U profiles are largely a part of the base laminate of the fibre composite component and a T-profile is formed from two sides of the U in each case.
- In the following, the invention will be described in detail on the basis of embodiments with reference to the accompanying figures of the drawings.
-
FIG. 1 is a schematic cross-sectional view of a mould portion of a fibre composite component with a first embodiment of a vacuum mat according to the invention with a receiving portion; -
FIG. 2 is a cross-sectional view of the receiving portion along line A-A shown inFIG. 1 ; -
FIG. 3 is a perspective plan view of an exemplary fibre composite component with mould portions with a second embodiment of the vacuum mat according to the invention; -
FIG. 4 is a schematic cross-sectional view of three mould portions of the fibre composite component with the second embodiment of the vacuum mat of the invention according toFIG. 3 ; -
FIG. 5 is a schematic cross-sectional view of the receiving portion of the first or second embodiment of the vacuum mat according to the invention with a first embodiment of a vacuum mat transportation means; -
FIG. 6 is a schematic cross-sectional view of a receiving portion of a third embodiment of the vacuum mat according to the invention with a second embodiment of the vacuum mat transportation means; -
FIG. 7 is a schematic cross-sectional view of a receiving portion of a fourth embodiment of the vacuum mat according to the invention with a third embodiment of the vacuum mat transportation means; -
FIG. 8 is a schematic, enlarged view of a retaining portion characterised inFIG. 7 by an oval; and -
FIG. 9 is a schematic cross-sectional view of an exemplary arrangement according to the invention for the production of a reinforced fibre composite component. - In the figures, the same reference numerals denote the same or functionally identical components, unless indicated otherwise.
-
FIG. 1 is a schematic cross-sectional view of amould portion 2 of a fibrecomposite component portion 3 of a fibre composite component 1 (seeFIG. 3 ) with a first embodiment of avacuum mat 5 according to the invention with a receivingportion 6. - The fibre
composite component portion 3 is arranged here on abase plate 24 of a production arrangement (seeFIG. 9 ), which is described in more detail further below, and is provided for reinforcing by a reinforcingelement 4, in this case a T-stringer by a vacuum infusion process in the illustratedmould portion 2. - For this purpose, the reinforcing
element 4 was previously introduced in a different location into arecess 10, compatible with the reinforcingelement 4, of the receivingportion 6 of thevacuum mat 5 and is completely enclosed by saidrecess 10. In this case, thevacuum mat 5 is produced from silicone. In the receivingportion 6, the silicone material as a receivingbody 9 surrounds the reinforcingelement 4. Before thefibre composite component 1 is cured, the reinforcingelement 4 can be pre-cured while it is unhardened, i.e. flexible, or it can be cured. It is supported by the receivingbody 9. - Due to the nature of the material of the vacuum mat 5 (silicone, very soft and flexible), the
vacuum mat 5 then has to be applied with the inserted reinforcingelement 4 onto the fibrecomposite component portion 3, which is to be reinforced by the reinforcingelement 4, by a suitable vacuummat transportation device 12 which is described below in detail, such that the lower portion of the reinforcingelement 3 rests directly on the fibrecomposite component portion 3. In so doing, the fibrecomposite component portion 3 and the reinforcingelement 4 are covered by thevacuum mat 5 which seals off the structure from the atmosphere by a self-sealingportion 7 arranged peripherally on the edge of the vacuum mat. In this example, the sealingportion 7 has a V-shaped sunk key 8 which cooperates here in a groove, corresponding therewith, in thebase plate 24. - The
recess 10 in the receivingportion 6 of thevacuum mat 5 is configured as a preformed “pocket” by a dummy component during the production of the vacuum mat. In this respect, the dummy component is an originally-sized replica of the reinforcingelement 4, as a result of which all the geometric characteristics of the reinforcingcomponent 4 which is received later on in therecess 10 are reproduced. Therecess 10 is extended in its longitudinal direction by anincision 11, as can be seen inFIG. 2 , which is a cross-sectional view of the receivingportion 6 along line A-A ofFIG. 1 . Thisincision 11 has the advantage that after themould portion 2 has cured, a removal from the mould of thevacuum mat 5 is made easier, i.e. when thevacuum mat 5 is lifted up from the reinforcingelement 4 which is then connected to the fibrecomposite component portion 3. This will be described in more detail further below. - Only one reinforcing
element 4 is shown inFIG. 1 and is described, but a plurality of reinforcingelements 4 can be required for reinforcing afibre composite component 1, asFIG. 3 shows in a perspective plan view of an exemplary fibrecomposite component 1 withmould portions 2 with a second embodiment of thevacuum mat 5 according to the invention. - In
FIG. 3 , six reinforcingelements 4 are arranged on the fibrecomposite component portion 3 of thefibre composite component 1 and are covered by thevacuum mat 5 which, in this case, has arecess 10 for each reinforcingelement 4. Furthermore, in this second embodiment, thevacuum mat 5 is fitted with closable air supply means 23, through which air or gas is blown in between thevacuum mat 5 and the fibrecomposite component portion 3 when thevacuum mat 5 is removed from the mould in order to facilitate the removal from the mould. In this respect, the incisions, show inFIG. 2 , are widened by the air which is blown in and thus allow the receivingbody 9 to be detached more easily from the respective reinforcingelement 4. -
FIG. 4 is a schematic cross-sectional view of threemould portions 2 of thefibre composite component 1 with the second embodiment of thevacuum mat 5 of the invention according toFIG. 3 , the closable air supply means 23 being configured as connecting pipes. A closing ability can be achieved manually, pneumatically or electrically/electromagnetically by valves (not shown). These air supply means 23 can also be used for applying a vacuum required for the vacuum infusion. - As mentioned above, the
vacuum mat 5 is transported by a vacuummat transportation device 12. For this purpose, the vacuummat transportation device 12 hasgrippers 13 for handling thevacuum mat 5. A first embodiment of agripper 13 is shown schematically inFIG. 5 . In this example, thegripper 13 is equipped with twogripper arms 14, the upper ends of which are coupled in a joint in scissor-form such that they can pivot backwards and forwards in the direction of the arrows. Their lower ends are provided withvacuum gripper elements 15 which cooperate with the outside of the receivingbody 9 of the receivingportion 6, shown here, of thevacuum mat 5. For this purpose, the receivingportion 6 has here reinforcedcontact portions 22 for thevacuum gripper elements 15. Thegripper arms 14 can be pivoted, for example by a pneumatic or electromotive drive (not shown) or the like. To raise thevacuum mat 5, said gripper arms pivot towards the receivingportion 6, draw it up by suction and transport thevacuum mat 5 to predetermined positions. - Similarly to
FIG. 5 ,FIG. 6 is a schematic cross-sectional view of a receivingportion 6 of a third embodiment of thevacuum mat 5 according to the invention with a second embodiment of the vacuum mat transportation means 12 which haselectromagnetic gripper elements 16 which cooperate withmagnetisable components 17 in thecontact portions 22 in the receivingbody 9 of the receivingportion 6 of thevacuum mat 5. The operation is easy to imagine. -
FIG. 7 shows a further mechanical gripper configuration, similar toFIGS. 5 and 6 , in a schematic cross-sectional view of a receivingportion 6 of a fourth embodiment of thevacuum mat 5 according to the invention with a third embodiment of the vacuum mat transportation means 12. The lower ends of thegripper arms 14 are fitted withmechanical gripper elements 19 with, in this case, a rectangular body (for example a cuboid) which have in their longitudinal direction (arrows)adjustable pegs 20, as illustrated inFIG. 8 in an enlarged schematic view of the region marked by an oval inFIG. 7 . Themechanical gripper elements 19 are introduced intoseats 21 of engagingelements 18 in thecontact portions 22 on the receivingportions 6 of thevacuum mat 5 for gripping thevacuum mat 5, theadjustable pegs 20 being retracted. When therectangular bodies 19 have been fully received in therespective seat 21, thepegs 20 are moved out into corresponding recesses to produce a locking effect. Thepegs 20 can be adjusted, for example by an electric motor, electromagnetically or pneumatically. For example, thepegs 20 can be drawn in pneumatically against a spring pressure and, upon reaching their recesses, can be locked therein by the spring pressure. Further mechanical gripper means are of course possible. Combinations of the examples shown here are also conceivable. -
FIG. 9 is a schematic cross-sectional view of an exemplary arrangement according to the invention for the production of a reinforcedfibre composite component 1 with the above-mentioned vacuum mat transportation means 12. - The vacuum mat transportation means 12 can be of a modular configuration, for example, so that it can be easily adapted to
fibre composite components 1 with different dimensions, it being possible for the same gripper means 13 to be used, for example. However, combinations are also conceivable. - In the illustrated example, the
fibre composite component 1 positioned on thebase plate 24 is to be reinforced with four reinforcingelements 4 which were previously received in therespective recesses 10 in thevacuum mat 5, as described above. This fitting procedure can be carried out, for example in a separate room or even next to thebase plate 24. The vacuummat transportation device 12 grasps thevacuum mat 5 equipped with the reinforcingelements 4 by the gripper means, as stated above and transports it to thebase plate 24 shown here inFIG. 9 . This can be performed in different ways, depending on the situation, for example by a crane mechanism or using a rail system. - For reproducible positioning, the
base plate 24 and the vacuum mat transportation means 12 have in this case, on the edge of this component device, centring means 25, for example centring pins on the vacuum mat transportation means 12 and corresponding seats in thebase plate 24. - When the
vacuum mat 5 has been centred, positioned and deposited in a sealed manner, the gripper means 13 are opened, as described above and the vacuummat transportation device 12 is moved to the side. Sealing is carried out here, as described above, by a self-sealing V-shaped sunk key seal. Thefibre composite component 1 can then be cured. Thereafter, the vacuummat transportation device 12 is again positioned over thevacuum mat 5 to raise thevacuum mat 5, as described above. - The arrangement can comprise a control means which is connected to the centring means 25, to drive means for moving the vacuum
mat transportation device 12, to drive means for the gripper means 13 and to further indicating and sensor means. Consequently, the production of the reinforcedfibre composite component 1 is automated such that a high reproducibility is achieved with a very low error probability, thevacuum mat 5 being reusable. - Although the present invention has been described here on the basis of preferred embodiments, it is not restricted thereto, but can be modified in many different ways.
- For example, it is possible to work on and process not only T-stringers, but also reinforcing elements with other profiles, for example Ω and/or I-stringers, and also U-stringers by means of the invention and in the case of U-stringer profiles, particular positioning procedures are employed.
- The
vacuum mat 5 can be used not only for the stringers, i.e. for the reinforcingelements 4, but also for so-called stringer retaining profiles. Thus, a great versatility with an advantageous reusability is provided. - In a method for reinforcing a
fibre composite component 1 for aviation and space flight, avacuum mat 5 with at least one receivingportion 6 is configured for reproducibly receiving at least one reinforcingelement 4. The at least one reinforcingelement 4 is introduced into the at least one receivingportion 6 of thevacuum mat 5. Thevacuum mat 5 with at least one introduced reinforcingelement 4 is applied in a reproducible manner to thefibre composite component 1, to be reinforced, in a sealed manner to form amould portion 2 and at least the formedmould portion 2 is cured to connect the at least one reinforcingelement 4 to the fibre composite component. Thevacuum mat 5 is then removed from the reinforcedfibre composite component 1 and is prepared to be reused. A correspondingvacuum mat 5 and an arrangement for producing a corresponding reinforcedfibre composite component 1. -
- 1 fibre composite component
- 2 mould portion
- 3 fibre composite component portion
- 4 reinforcing element
- 5 vacuum mat
- 6 receiving portion
- 7 sealing portion
- 8 V-shaped sunk key
- 9 receiving body
- 10 recess
- 11 incision
- 12 vacuum mat transportation means
- 13 gripper means
- 14 gripper arm
- 15 vacuum gripper element
- 16 electromagnetic gripper element
- 17 magnetisable component
- 18 engaging element
- 19 mechanical gripper element
- 20 peg
- 21 seat
- 22 contact portion
- 23 air supply means
- 24 base plate
- 25 centring means
Claims (11)
1. A vacuum mat for the production of a reinforced fibre composite component for aviation and space flight, comprising:
at least one receiving portion for receiving at least one reinforcing element, wherein the at least one receiving portion has a recess for receiving the reinforcing element and at least one incision joined to the recess for removal from the mould;
a peripherally arranged, self-sealing portion for sealing the vacuum mat from the atmosphere when positioned against an associated contact surface; and
at least one contact portion for cooperating with an associated vacuum mat transportation means.
2. The vacuum mat according to claim 1 , wherein the recess is provided with at least one incision in the extension of its longitudinal direction for removal from the mould.
3. The vacuum mat according to claim 1 , wherein the sealing portion is configured in the form of a V-shaped sunk key.
4. The vacuum mat according to claim 1 , wherein the vacuum mat is provided with at least one closable air supply means.
5. The vacuum mat according to claim 1 , wherein the at least one contact portion is arranged on the at least one receiving portion.
6. The vacuum mat according to claim 1 , wherein the at least one contact portion is configured with a corresponding rigidity for cooperating with a vacuum gripper of the vacuum mat transportation means.
7. The vacuum mat according to claim 1 , wherein the at least one contact portion is configured with a corresponding magnetisable component for cooperating with a magnetic and/or electromagnetic gripper of the vacuum mat transportation means.
8. The vacuum mat according to claim 1 , wherein the at least one contact portion is configured with a corresponding engaging element for cooperating with a mechanical gripper of the vacuum mat transportation means.
9. The vacuum mat according to claim 1 , wherein the vacuum mat is configured as a reusable silicone vacuum bag.
10. An arrangement for the production of a reinforced fibre composite component for aviation and space flight, comprising:
a base plate for supporting the fibre composite component to be reinforced;
a vacuum mat; and
a vacuum mat transportation means with at least one gripper means for cooperating with corresponding contact portions on the vacuum mat to transport the vacuum mat with at least one introduced reinforcing element into a predetermined position relative to the fibre composite component to be reinforced;
wherein the base plate and the vacuum mat transportation means have mutually corresponding centring means for a reproducible positioning of the vacuum mat relative to the fibre composite component to be reinforced and the base plate and the vacuum mat have mutually corresponding sealing means for an encircling sealing of the vacuum mat from the atmosphere, the vacuum mat being configured according to claim 1 .
11. The arrangement according to claim 10 , wherein for detecting the reproducibly deposited vacuum mat, the arrangement has an indicating means which is coupled with an associated control means for controlling the vacuum mat transportation means.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/408,660 US20120152461A1 (en) | 2007-12-20 | 2012-02-29 | Method for reinforcing a fibre composite component and a vacuum mat and arrangement for producing a reinforced fibre composite component |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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US840107P | 2007-12-20 | 2007-12-20 | |
DE102007061431.6 | 2007-12-20 | ||
DE102007061431A DE102007061431B4 (en) | 2007-12-20 | 2007-12-20 | Method for stiffening a fiber composite component and vacuum mat and arrangement for producing a stiffened fiber composite component |
PCT/EP2008/065699 WO2009080410A1 (en) | 2007-12-20 | 2008-11-17 | Method for reinforcing a fiber composite component and vacuum mat and arrangement for the production of a reinforced fiber composite component |
US12/816,853 US8137499B2 (en) | 2007-12-20 | 2010-06-16 | Method for reinforcing a fibre composite component and a vacuum mat and arrangement for producing a reinforced fibre composite component |
US13/408,660 US20120152461A1 (en) | 2007-12-20 | 2012-02-29 | Method for reinforcing a fibre composite component and a vacuum mat and arrangement for producing a reinforced fibre composite component |
Related Parent Applications (1)
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US12/816,853 Division US8137499B2 (en) | 2007-12-20 | 2010-06-16 | Method for reinforcing a fibre composite component and a vacuum mat and arrangement for producing a reinforced fibre composite component |
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US20120152461A1 true US20120152461A1 (en) | 2012-06-21 |
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US13/408,660 Abandoned US20120152461A1 (en) | 2007-12-20 | 2012-02-29 | Method for reinforcing a fibre composite component and a vacuum mat and arrangement for producing a reinforced fibre composite component |
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US12/816,853 Expired - Fee Related US8137499B2 (en) | 2007-12-20 | 2010-06-16 | Method for reinforcing a fibre composite component and a vacuum mat and arrangement for producing a reinforced fibre composite component |
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US (2) | US8137499B2 (en) |
EP (1) | EP2219853B1 (en) |
JP (1) | JP2011506149A (en) |
CN (1) | CN101932433B (en) |
AT (1) | ATE553911T1 (en) |
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CA (1) | CA2707932A1 (en) |
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US20040115299A1 (en) * | 2002-12-11 | 2004-06-17 | John Potter | Seal-less reusable vacuum bag |
US20070151657A1 (en) * | 2005-12-29 | 2007-07-05 | Airbus Espana, S.L. | Process of manufacturing composite structures with embedded precured tools |
Cited By (3)
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US8746315B2 (en) | 2009-12-18 | 2014-06-10 | Airbus Operations Gmbh | Apparatus for the production of an aircraft fuselage shell consisting of a fibre composite |
US9656412B2 (en) | 2011-03-24 | 2017-05-23 | Airbus Operations Gmbh | Method and device for producing a fibre composite component |
EP3112118A1 (en) * | 2015-06-24 | 2017-01-04 | Airbus Operations GmbH | Method and apparatus for producing a component by use of a vacuum film |
Also Published As
Publication number | Publication date |
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DE102007061431B4 (en) | 2013-08-08 |
DE102007061431A1 (en) | 2009-06-25 |
EP2219853B1 (en) | 2012-04-18 |
WO2009080410A1 (en) | 2009-07-02 |
RU2010122661A (en) | 2012-01-27 |
CA2707932A1 (en) | 2009-07-02 |
RU2480336C2 (en) | 2013-04-27 |
ATE553911T1 (en) | 2012-05-15 |
EP2219853A1 (en) | 2010-08-25 |
US20100314042A1 (en) | 2010-12-16 |
BRPI0821382A2 (en) | 2017-05-23 |
JP2011506149A (en) | 2011-03-03 |
CN101932433B (en) | 2014-04-16 |
CN101932433A (en) | 2010-12-29 |
US8137499B2 (en) | 2012-03-20 |
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