ES2257138B1 - PROCEDURE TO CONFORM STRATIFIED SHEETS OF COMPOSITE MATERIAL, WITH DOUBLE CURVATURE GEOMETRY. - Google Patents
PROCEDURE TO CONFORM STRATIFIED SHEETS OF COMPOSITE MATERIAL, WITH DOUBLE CURVATURE GEOMETRY. Download PDFInfo
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- ES2257138B1 ES2257138B1 ES200303076A ES200303076A ES2257138B1 ES 2257138 B1 ES2257138 B1 ES 2257138B1 ES 200303076 A ES200303076 A ES 200303076A ES 200303076 A ES200303076 A ES 200303076A ES 2257138 B1 ES2257138 B1 ES 2257138B1
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims description 30
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000000717 retained effect Effects 0.000 claims 5
- 230000037303 wrinkles Effects 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 241000282326 Felis catus Species 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- 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
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/04—Bending or folding of plates or sheets
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Procedimiento para conformar láminas estratificadas de material compuesto, con geometría de doble curvatura, aplicando una lámina (1) sobre un útil (10) de conformación que le impone una curvatura según un primer eje, sobresaliendo una parte marginal de borde (3) de dicha lámina (1) en voladizo de dicho útil (10). Dicha parte marginal (3) es cogida entre dos placas de conformación (15, 16) en una primera posición superior de éstas, de forma que pueda deslizar, escapándose entre ellas, mientras dichas placas son hechas bajar a lo largo de una pared vertical de dicho útil (10) para doblar dicha parte marginal (3) según una línea de plegado (4) que forma ángulo con dicho primer eje de curvatura. El borde de la placa inferior (16) se encuentra en contacto, durante todo su desplazamiento, con la superficie vertical de dicho útil (10), mientras que el borde (15a) de la placa superior (15) está separado de dicha superficie vertical de dicho útil en una distancia correspondiente al grosor de dichalámina (1) y tiene redondeada su arista inferior. Se describe también un aparato correspondiente.Procedure for forming laminated sheets of composite material, with double curvature geometry, applying a sheet (1) on a forming tool (10) that imposes a curvature along a first axis, protruding a marginal edge part (3) of said cantilever sheet (1) of said tool (10). Said marginal part (3) is caught between two forming plates (15, 16) in a first upper position of these, so that it can slide, escaping between them, while said plates are lowered along a vertical wall of said tool (10) for folding said marginal part (3) along a fold line (4) that forms an angle with said first axis of curvature. The edge of the lower plate (16) is in contact, during its entire movement, with the vertical surface of said tool (10), while the edge (15a) of the upper plate (15) is separated from said vertical surface of said tool in a distance corresponding to the thickness of said sheet (1) and its lower edge is rounded. A corresponding apparatus is also described.
Description
Procedimiento para conformar láminas estratificadas de material compuesto, con geometría de doble curvatura.Sheet forming procedure composite laminates, with double geometry curvature.
El presente invento se refiere, en general, al plegado de láminas estratificadas de material compuesto y, en particular, a un procedimiento y un aparato para introducir en tales láminas, esencialmente planas, un doblez para conseguir una sección determinada.The present invention relates, in general, to folding of laminated sheets of composite material and, in particular, to a procedure and an apparatus to introduce in such essentially flat sheets, a fold to get a section determined.
En la fabricación de piezas de material compuesto en forma de láminas estratificadas a partir de piezas esencialmente planas de dicho material a las que haya que dotar de un doblez a lo largo de una línea determinada para conformarlas con un cierto ángulo, por ejemplo de 90°, la práctica común es realizar tal operación de conformación disponiendo primeramente una lamina estratificada, sustancialmente plana, sobre un útil de soporte; a continuación, dicha lámina estratificada de material compuesto es sometida a una operación de plegado para conseguir la creación de, por ejemplo, un doblez a 90° a lo largo de una línea de plegado.In the manufacture of material parts composed in the form of laminated sheets from pieces essentially flat of said material to be provided with a fold along a certain line to conform them at a certain angle, for example 90 °, the common practice is perform such forming operation by first providing a laminated sheet, substantially flat, on a tool support; then said laminated sheet of material compound is subjected to a folding operation to achieve the creation of, for example, a 90 ° fold along a line folding
Cuando se trata de materiales compuestos laminares estratificados preimpregnados con resina, tales procesos de conformación requieren la aplicación de calor con el fin de reducir la viscosidad de la resina y facilitar el deslizamiento de las capas que los componen durante la citada operación de plegado.When it comes to composite materials laminates preimpregnated with resin, such processes shaping require the application of heat in order to reduce the viscosity of the resin and facilitate the sliding of the layers that compose them during the aforementioned operation of creased.
El procedimiento de conformación más típico se lleva a cabo en una máquina provista de una mesa, una membrana de vacío y un sistema de calentamiento, generalmente por radiación. La lámina de material compuesto estratificada, dispuesta en su útil de conformación, se coloca sobre la mesa de la máquina. A continuación, se aplica la membrana de vacío poniéndola en contacto con el material estratificado, y se aplica calor.The most typical conformation procedure is carried out in a machine provided with a table, a membrane of vacuum and a heating system, usually by radiation. The sheet of stratified composite material, arranged in its tooling conformation, is placed on the machine table. TO then the vacuum membrane is applied by contacting it with the stratified material, and heat is applied.
Una vez que el material compuesto laminar estratificado ha alcanzado la temperatura adecuada para proceder a su conformación, se aplica lentamente vacío entre la membrana y la mesa con lo que, al adaptarse la membrana sobre la mesa y el útil, las capas del material estratificado se doblan, adaptándose progresivamente sobre el útil de conformación. Este procedimiento debe realizarse con lentitud y a una temperatura adecuada, de manera que no se formen arrugas en la cara interior y en el borde exterior de la zona plegada.Once the composite sheet material stratified has reached the appropriate temperature to proceed to its conformation, a vacuum is slowly applied between the membrane and the table with which, when adapting the membrane on the table and the tool, the layers of the stratified material are folded, adapting progressively on the shaping tool. This procedure It should be done slowly and at an appropriate temperature, so that wrinkles do not form on the inner face and outer edge of the folded area.
Sin embargo, estas arrugas que suelen aparecen en tales procedimientos de conformación no siempre se deben a parámetros incorrectos en la ejecución del procedimiento puesto que, dependiendo de la geometría de la pieza que se quiere obtener, puede que su aparición resulte inevitable al seguir los pasos descritos. En particular, en ocasiones en que una lámina de material compuesto estratificado con una cierta curvatura o convexidad, ha de doblarse hacia su cara cóncava según una línea de plegado que forme ángulo con el eje de curvatura de dicha lámina estratificada, dichas arrugas se originan por causas geométricas.However, these wrinkles that usually appear in such conformation procedures they are not always due to Incorrect parameters in the execution of the procedure since, depending on the geometry of the piece you want to obtain, its appearance may be inevitable by following the steps described. In particular, on occasions when a sheet of composite material stratified with a certain curvature or convexity, it has to bend towards its concave face along a line of folding that forms an angle with the axis of curvature of said sheet stratified, these wrinkles originate from causes geometric
Por tanto, un objeto del presente invento es un procedimiento de conformación de la clase descrita en lo que antecede, merced al cual se consigue doblar una lámina de material compuesto estratificado sin que lleguen a formarse arrugas en la cara interior de la zona de plegado.Therefore, an object of the present invention is a conformation procedure of the class described in what previous, thanks to which it is possible to fold a sheet of material stratified compound without wrinkles forming on the inside face of the folding zone.
Otro objeto del invento es un aparato para llevar a la práctica el método de acuerdo con el invento.Another object of the invention is an apparatus for carry out the method according to the invention.
La Fig. 1 muestra, en perspectiva, una pieza de material compuesto estratificado del tipo obtenido mediante la ejecución del procedimiento de acuerdo con el invento;Fig. 1 shows, in perspective, a piece of stratified composite material of the type obtained by the execution of the process according to the invention;
la Fig. 2 representa un primer paso en la ejecución de dicho procedimiento,Fig. 2 represents a first step in the execution of said procedure,
la Fig. 3 ilustra un segundo paso del procedimiento del invento, representándose en ella el aparato de acuerdo con el invento;Fig. 3 illustrates a second step of the method of the invention, the apparatus of according to the invention;
la Fig. 4 es una vista en perspectiva de la pieza obtenida merced al procedimiento del invento; yFig. 4 is a perspective view of the piece obtained thanks to the process of the invention; Y
las Figs. 5a-5c ilustran de manera esquemática y en sección desde un lado del aparato de la Fig. 3, diversas etapas de la operación de plegado realizada de acuerdo con el presente invento.Figs. 5a-5c illustrate of schematic and sectional way from one side of the apparatus of Fig. 3, various stages of the folding operation performed according with the present invention.
En todas las figuras, piezas similares se han designado con los mismos números de referencia.In all figures, similar pieces have been designated with the same reference numbers.
Refiriéndonos ahora a los dibujos y en particular a la Fig. 1 de los mismos, en ella se representa en general con 1 una pieza constituida por una lámina de material compuesto estratificada con una superficie mayor 2 convexa y que, en uno de sus bordes presenta un doblez realizado por una línea de plegado 4 para definir una pestaña 3 que se encuentra en un plano sustancialmente perpendicular al plano general de la superficie 2. Esta es la configuración final que se desea para la pieza 1.Referring now to the drawings and in particular to Fig. 1 thereof, it is represented in general with 1 a piece consisting of a sheet of material stratified compound with a greater convex surface 2 and that, at one of its edges it presents a fold made by a line of folding 4 to define a tab 3 that is in a plane substantially perpendicular to the general plane of the surface 2. This is the final configuration that is desired for part 1.
La conformación de este tipo de piezas, utilizadas por ejemplo en la construcción de aeronaves, a partir de una lámina plana estratificada de material compuesto por los procedimientos de la técnica conocida generaría arrugas en la parte inferior y en el borde de la pestaña plegada. Esta técnica es en la que encuentran aplicación el procedimiento y el aparato del presente invento con el fin de conseguir que la superficie interna de la parte doblada de dicha lámina y el borde de la pestaña 3 de la misma estén libres de arrugas al término de la conformación.The conformation of this type of pieces, used for example in the construction of aircraft, from a flat laminated sheet of material composed of procedures of the known technique would generate wrinkles on the part bottom and at the edge of the folded tab. This technique is in the which find the procedure and apparatus of the present application invention in order to get the inner surface of the folded part of said sheet and the edge of the tab 3 of the They are wrinkle free at the end of the conformation.
Para describir el procedimiento de acuerdo con este invento se hará referencia en lo que sigue a las Figs. 2, 3 y 5a-5c, en las que se ilustran diversas etapas de la conformación de una lámina estratificada de material compuesto, representándose de forma simplificada el aparato del invento en la Fig. 3 en particular y esquematizándose dichas etapas más claramente en las Figs. 5a-5c.To describe the procedure according to This invention will be referred to in what follows Figs. 2, 3 and 5a-5c, in which various stages of the conformation of a laminated composite sheet, the apparatus of the invention being simplified in the Fig. 3 in particular and schematizing said stages more clearly in Figs. 5a-5c.
De manera específica, en la Fig. 2 se muestra una pieza 1 de material compuesto en forma de lámina estratificada que se tiende sobre un útil de conformación 10 situado sobre una placa de base 11. Dicho útil 10 presenta una convexidad en su superficie superior definiéndose un borde de conformación 12 sobre el que se extiende en voladizo una parte marginal de dicha lámina 1 que sobresale de dicho borde en una distancia, dependiente de la dimensión que se le quiera proporcionar a la pestaña 3 que ha de formarse en dicha 1 pieza de material laminar.Specifically, Fig. 2 shows a piece 1 of composite material in the form of a laminated sheet which lies on a forming tool 10 located on a base plate 11. Said tool 10 has a convexity in its upper surface defining a forming edge 12 on which spreads a marginal part of said sheet 1 protruding from said edge by a distance, dependent on the dimension that you want to provide to tab 3 to be formed in said 1 piece of sheet material.
En la Fig. 3 se puede apreciar la disposición de un marco 13 solidario de la placa de base 11 y en el que está montado al menos un gato de accionamiento 14 (en el ejemplo ilustrado se han representado tres) de forma que el vástago de dicho al menos un gato 14 pueda extenderse y retraerse en un movimiento de vaivén en dirección vertical. A los extremos libres del vástago de dicho al menos un gato 14 está fijado un conjunto de placas de conformación 15, 16 (en la Fig. 3 únicamente se puede ver la placa superior 15 de dicho conjunto) cuya configuración arqueada corresponde a la curva definida en el borde 12 del útil 10 de conformación convexo.In Fig. 3 the arrangement of a frame 13 integral with the base plate 11 and in which it is mounted at least one drive jack 14 (in the example illustrated three) so that the stem of said at least one cat 14 can extend and retract in a movement reciprocating in vertical direction. To the free ends of the stem of said at least one jack 14 is fixed a set of plates of conformation 15, 16 (in Fig. 3 only the plate can be seen upper 15 of said set) whose arched configuration corresponds to the curve defined on edge 12 of tool 10 of convex conformation
Este conjunto de placas (véanse las Figs. 5a -
5c) están destinadas a fijarse una sobre otra de manera que, entre
ambas, pueda sujetarse a deslizamiento el borde de dicho material
laminar 1 que sobresale en voladizo desde el útil de conformación
10. Para sujetar de manera deslizante entre ambas placas 15, 16 a
dicho material laminar 1, está previsto un distanciador 17 que
define la separación apropiada de dichas placas 15, 16 según el
grosor de dicho material la-
minar 1.This set of plates (see Figs. 5a-5c) are intended to be fixed one on top of the other so that, between the two, the edge of said sheet material 1 protruding cantilever from the forming tool 10 can be slid. fastening slidably between both plates 15, 16 to said sheet material 1, a spacer 17 is provided which defines the appropriate separation of said plates 15, 16 according to the thickness of said sheet material.
mine 1.
Estas placas están destinadas a transmitir el calor necesario para reducir la viscosidad de la resina que impregna las capas que constituyen dicho material laminar 1, al tiempo que lo presionan evitando la formación de arrugas en él durante la conformación, y son accionadas de manera controlada, para bajar y subir por los vástagos de dicho al menos un gato 14. Por supuesto, con el fin de reducir el rozamiento entre las placas 15 y 16 y la lámina 1 presionada entre ellas, ésta puede alojarse entre ambas con interposición de una película de material adecuado para reducir el rozamiento, por ejemplo de teflón, y/o estando las superficies enfrentadas de dichas placas 15, 16 destinadas a entrar en contacto con el material laminar 1 dotadas de un recubrimiento antiadherente.These plates are intended to transmit the heat needed to reduce the viscosity of the impregnated resin the layers constituting said sheet material 1, while they press it avoiding the formation of wrinkles in it during the conformation, and are operated in a controlled manner, to lower and climb the stems of said at least one cat 14. Of course, in order to reduce friction between plates 15 and 16 and the sheet 1 pressed between them, it can be housed between them with interposition of a film of suitable material to reduce friction, for example Teflon, and / or surfaces being facing said plates 15, 16 intended to come into contact with sheet material 1 provided with a coating non-stick
Finalmente, el aparato se completa con un
miembro de sujeción 20 (véase la Fig. 3) con una curvatura
correspondiente a la del útil de conformación 10 y que se aplica
con presión contra el material laminar 1 para fijarlo y soportar la
tensión generada en el material laminar estratificado 1 durante la
conformación de la pestaña 3. Preferiblemente, la superficie
inferior de dicho miembro de sujeción 20 debe ejercer una presión
uniforme sobre dicho material laminar 1 y su función resulta más
eficaz si está tratada para dotarla de rugosidad o está provista de
un revestimiento que le proporcione dicha rugosidad (no
mostrado).Finally, the apparatus is completed with a clamping member 20 (see Fig. 3) with a curvature corresponding to that of the forming tool 10 and which is applied with pressure against the sheet material 1 to fix it and withstand the tension generated in the laminated sheet material 1 during the forming of the flange 3. Preferably, the lower surface of said clamping member 20 should exert a uniform pressure on said sheet material 1 and its function is more effective if it is treated to provide it with roughness or is provided with a coating that provides such roughness (not
shown).
El procedimiento de conformación de acuerdo con el invento se muestra en secuencia en las Figs. 5a-5c, en la primera de las cuales se representa el conjunto de placas 15, 16 abrazando el borde del material laminar 1 que sobresale en voladizo desde el útil de conformación 10 con interposición, como antes se ha dicho, entre dichas placas y dicho material de, por ejemplo, una película separadora destinada a facilitar el deslizamiento. Dichas placas 15, 16 se fijan en posición una con relación a otra, por medios de sujeción adecuados (no mostrados), por ejemplo tornillos.The conformation procedure according to The invention is shown in sequence in Figs. 5a-5c, in the first of which the plate assembly 15, 16 hugging the edge of the sheet material 1 protruding cantilever from forming tool 10 with interposition, as mentioned above, between said plates and said material of, for example, a separating film intended for facilitate sliding. Said plates 15, 16 are fixed in position one in relation to another, by suitable fastening means (not shown), for example screws.
En esta primera posición del aparato se inicia el calentamiento de las citadas placas 15 y 16 con el fin de reblandecer la resina que impregna el material estratificado laminar 1. Una vez que se ha alcanzado la temperatura apropiada, se inicia el accionamiento de dicho al menos un gato 14, extendiéndose su vástago de pistón hacia abajo, con lo que las placas de conformación 15, 16 inician su desplazamiento descendente junto a la superficie vertical del útil 1 de conformación. A medida que bajan dichas placas 15, 16, el material laminar 1 comienza a deslizarse escapándose entre ellas.In this first position of the device starts the heating of said plates 15 and 16 in order to soften the resin that permeates the laminated laminate 1. Once the appropriate temperature has been reached, it starts the actuation of said at least one jack 14, extending its piston rod down, bringing the plates of conformation 15, 16 begin their downward displacement next to the vertical surface of forming tool 1. As they go down said plates 15, 16, the sheet material 1 begins to slide escaping between them.
Como se podrá comprobar, el borde 15a de la lámina superior 15 próximo a la superficie vertical de dicho útil de conformación 10 está separado de dicha superficie vertical en una distancia sustancialmente igual al grosor de dicho material laminar 1, por motivos que resultarán evidentes en lo que sigue y, además, presenta una arista inferior redondeada. El borde curvado 12 de dicho útil 10 también está redondeado en 10a.As you can see, the edge 15a of the upper sheet 15 near the vertical surface of said tool of conformation 10 is separated from said vertical surface in a distance substantially equal to the thickness of said sheet material 1, for reasons that will be evident in what follows and, in addition, It has a rounded bottom edge. The curved edge 12 of said tool 10 is also rounded in 10a.
En la Fig. 5b se puede apreciar que el conjunto de placas de conformación 15, 16 ha sido hecho descender por dicho al menos un gato 14 con lo que el material laminar 1 ha ido deslizando de entre dichas placas 15, 16 y está siendo aplicado contra la pared vertical del mencionado útil de conformación 1 por el borde redondeado 15a. La acción conjunta de las placas de conformación 15 y 16 evita que se arrugue el material laminar 1 mientras se encuentra entre ellas y va siendo aplicado a la superficie vertical del útil 1 de con formación, y la presión ejercida por el borde 15a de la placa 15 contra la parte de dicho material laminar 1 ya aplicada contra la mencionada superficie vertical evita que se generen arrugas en dicho material compuesto estratificado.In Fig. 5b it can be seen that the assembly of forming plates 15, 16 has been lowered by said at least one cat 14 with what the sheet material 1 has gone sliding between said plates 15, 16 and is being applied against the vertical wall of said forming tool 1 by the rounded edge 15a. The joint action of the plates conformation 15 and 16 prevents the sheet material from wrinkling 1 while it is among them and is being applied to the vertical surface of tool 1 with formation, and pressure exerted by the edge 15a of the plate 15 against the part of said sheet material 1 already applied against said surface vertical prevents wrinkles in said composite material stratified
Finalmente, en la Fig. 5c se representa la etapa final del procedimiento, en la que el material laminar 1 estratificado ha deslizado saliendo por completo de entre las placas 15, 16 y siendo aplicado contra la superficie vertical del útil de conformación 1 por el borde 15a de la placa superior 15 totalmente desprovisto de arrugas. El resultado se representa en la Fig. 4, en la que se ilustra la pieza terminada de material compuesto laminar estratificado.Finally, in Fig. 5c the stage is represented end of the procedure, in which the sheet material 1 stratified has slipped out completely between the plates 15, 16 and being applied against the vertical surface of the forming tool 1 by the edge 15a of the upper plate 15 totally devoid of wrinkles. The result is represented in the Fig. 4, in which the finished piece of material is illustrated layered laminate compound.
Claims (9)
ciones de:1. A procedure for forming a laminated composite sheet, with double curvature geometry, characterized by the operations
tion of:
placas; ymoving down said two plates (15, 16) with the bottom edge (16) of said plates in permanent contact with the surface of the vertical wall of said support and forming tool (10) so that said edge part marginal (3) of said sheet (1) retained between them bends along a folding line (4) that forms an angle with said first axis of curvature and gradually escaping between said plates (15, 16) while being applied to said vertical surface of said tool (10) by the edge (15a) of the upper (15) of said
plates; Y
mina (1);a support and forming tool (10) that imposes a curvature along a first axis to said lamp
mine (1);
deada.6. Apparatus according to claim 5, characterized in that said edge (15a) of said upper plate (15) has a round bottom edge
From ada.
rugosa.7. Apparatus according to any one of claims 4 to 6, characterized in that the lower surface of said clamping member (20) intended to be applied against said sheet (1) is
rough.
sidad.8. Apparatus according to any one of claims 4 to 6, characterized in that the lower surface of said clamping member (20) intended to be applied against said sheet (1) is provided with a coating that provides it roughly.
Sity
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200303076A ES2257138B1 (en) | 2003-12-30 | 2003-12-30 | PROCEDURE TO CONFORM STRATIFIED SHEETS OF COMPOSITE MATERIAL, WITH DOUBLE CURVATURE GEOMETRY. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200303076A ES2257138B1 (en) | 2003-12-30 | 2003-12-30 | PROCEDURE TO CONFORM STRATIFIED SHEETS OF COMPOSITE MATERIAL, WITH DOUBLE CURVATURE GEOMETRY. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ES2257138A1 ES2257138A1 (en) | 2006-07-16 |
| ES2257138B1 true ES2257138B1 (en) | 2007-07-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES200303076A Expired - Fee Related ES2257138B1 (en) | 2003-12-30 | 2003-12-30 | PROCEDURE TO CONFORM STRATIFIED SHEETS OF COMPOSITE MATERIAL, WITH DOUBLE CURVATURE GEOMETRY. |
Country Status (1)
| Country | Link |
|---|---|
| ES (1) | ES2257138B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2971728B1 (en) * | 2011-02-22 | 2015-02-13 | Astrium Sas | PROCESS FOR FORMING COMPOSITE ARTICLES OF NON-DEVELOPABLE FORM WITH CONTINUOUS FIBERS |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1467635A (en) * | 1973-05-22 | 1977-03-16 | Kelvinator Ltd | Refrigerator construction and the manufacture of panels therefor |
| US3977932A (en) * | 1973-08-08 | 1976-08-31 | Steelcase, Inc. | Method and apparatus for post forming laminates |
| US4478664A (en) * | 1981-11-04 | 1984-10-23 | Evans Rotork, Inc. | Round edge former |
| WO1986002314A1 (en) * | 1984-10-12 | 1986-04-24 | Isovolta, Österreichische Isolierstoffwerke Aktien | Method and device for hot forming a stratified synthetic plate |
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2003
- 2003-12-30 ES ES200303076A patent/ES2257138B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ES2257138A1 (en) | 2006-07-16 |
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