ES2928104A1 - Procedure for making complex pieces of carbon fiber, fiberglass or similar (Machine-translation by Google Translate, not legally binding) - Google Patents
Procedure for making complex pieces of carbon fiber, fiberglass or similar (Machine-translation by Google Translate, not legally binding) Download PDFInfo
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- ES2928104A1 ES2928104A1 ES202130394A ES202130394A ES2928104A1 ES 2928104 A1 ES2928104 A1 ES 2928104A1 ES 202130394 A ES202130394 A ES 202130394A ES 202130394 A ES202130394 A ES 202130394A ES 2928104 A1 ES2928104 A1 ES 2928104A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
- B29C33/301—Modular mould systems [MMS], i.e. moulds built up by stacking mould elements, e.g. plates, blocks, rods
- B29C33/302—Assembling a large number of mould elements to constitute one cavity
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
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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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/004—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore making articles by joining parts moulded in separate cavities, said parts being in said separate cavities during said joining
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
DESCRIPCIÓNDESCRIPTION
Procedimiento de realización de piezas complejas de fibra de carbono, fibra de vidrio o similaresProcedure for making complex pieces of carbon fiber, fiberglass or similar
CAMPO TECNICO DE LA INVENCIÓNTECHNICAL FIELD OF THE INVENTION
La presente descripción se refiere a un procedimiento de realización de piezas complejas de fibra de carbono, fibra de vidrio o similares que aporta ventajas indudables de fabricación, resistencia y menor complejidad en la fabricación de piezas complejas de estos materiales.This description refers to a procedure for making complex parts made of carbon fiber, fiberglass or the like that provides unquestionable advantages in terms of manufacturing, resistance and less complexity in the manufacture of complex parts made of these materials.
El procedimiento prevé la utilización de moldes complejos, formados por moldes modulares, cada uno de los cuales es recubierto interiormente por la pieza de fibra de carbono o fibra de vidrio recortada, reproduciendo en 2D la forma del molde 3D y con la característica de que una vez recubriendo el molde, deje una solapa alrededor del borde libre del mismo. Una vez que se ensamblan los moldes, los rebordes de las piezas de fibra de carbono o de vidrio se adhieren entre sí, formando una pieza única sin zonas de unión definida y por tanto siendo en toda la superficie de la pieza compleja efectuada, de la misma resistencia a la rotura.The procedure provides for the use of complex moulds, made up of modular moulds, each of which is internally covered by the cut carbon fiber or fiberglass piece, reproducing in 2D the shape of the 3D mold and with the characteristic that a Once lining the mold, leave a flap around the free edge of the mold. Once the molds are assembled, the edges of the carbon fiber or glass pieces are adhered to each other, forming a single piece without defined joint areas and therefore being the entire surface of the complex piece made, in the same way. same tensile strength.
ANTECEDENTES DE LA INVENCIÓNBACKGROUND OF THE INVENTION
Habitualmente, la forma de realización de piezas de fibra de carbono o fibra de vidrio complejas, se realizan partiendo de elementos comerciales, tal y como placas, tubos, etc.., que son pegados entre si o mediante racores de unión. Sin embargo, aunque estos sistemas consiguen reducir el peso de los materiales tradicionales, tal y como el acero o el aluminio, para ciertas aplicaciones no resultan adecuados la utilización de estos materiales compuestos, ya que las zonas de unión de estas estructuras resultan ser débiles.Usually, the embodiment of complex carbon fiber or fiberglass parts are made starting from commercial elements, such as plates, tubes, etc., which are glued together or by means of union fittings. However, although these systems manage to reduce the weight of traditional materials, such as steel or aluminium, the use of these composite materials is not suitable for certain applications, since the joining areas of these structures turn out to be weak.
Así por ejemplo las garras de los robots son piezas complejas, fabricadas de acero o de aluminio aumentando estas últimas considerablemente la capacidad de carga del robot al disminuirse considerablemente el peso de las garras de aluminio con respecto a las garras de acero. Se han realizado intentos de fabricación de garras de fibra de carbono por los procesos tradicionales de pegado de cuerpos simples, realizados de fibras de carbono y a pesar de reducirse el peso de las garras hasta en 4 veces el peso de la garra similar en aluminio, lo cual es una ventaja, sin embargo, esta fabricación no es apta para la fabricación de tales piezas, porque las zonas de unión entre piezas simples es precisamente la zona más débil del conjunto y acaban fallando por tales uniones. Thus, for example, robot claws are complex parts, made of steel or aluminum, the latter considerably increasing the load capacity of the robot by considerably reducing the weight of aluminum claws with respect to steel claws. Attempts have been made to manufacture carbon fiber claws by traditional simple body gluing processes, made of carbon fibers and despite reducing the weight of the claws by up to 4 times the weight of a similar aluminum claw, which which is an advantage, however, this fabrication is not suitable for the manufacture of such pieces, because the joint areas between simple pieces is precisely the weakest zone of the set and they end up failing due to such joints.
Es por tanto propósito de la invención, la obtención de piezas complejas resistentes y realizadas en un único paso, monolíticas, que sean capaces de aguantar pesos y esfuerzos superiores a los de las piezas homologas en acero o aluminio, que es como se fabrican en la actualidad.Therefore, the purpose of the invention is to obtain complex, resistant parts made in a single step, monolithic, that are capable of withstanding weights and stresses greater than those of homologous parts in steel or aluminum, which is how they are manufactured in the present.
DESCRIPCIÓN DE LA INVENCIÓNDESCRIPTION OF THE INVENTION
El objeto de la presente invención consiste en un procedimiento de realización de piezas complejas de fibra de carbono, fibra de vidrio o similares caracterizado porque comprende:The object of the present invention consists of a procedure for making complex pieces of carbon fiber, fiberglass or the like, characterized in that it comprises:
- realización de un molde hueco, dividido en mitades o piezas simples cuyo cerrado da origen a un hueco que coincide con el contorno exterior de la pieza a realizar.- making a hollow mould, divided into halves or simple pieces whose closing gives rise to a hole that coincides with the outer contour of the piece to be made.
- Apertura del molde para ser recubierto en su interior- Opening of the mold to be coated inside
- recortado en una sola pieza, haciendo un cuerpo monolítico de fibra de carbono o fibra de vidrio, reproduciendo la forma compleja del molde abierto y dejando perimetralmente una solapa o reborde libre de fibra de carbono o fibra de vidrio - cut in one piece, making a monolithic body of carbon fiber or fiberglass, reproducing the complex shape of the open mold and leaving a flap or edge free of carbon fiber or fiberglass around the perimeter
- repetir el proceso de recubrimiento de los otros cuerpos del molde, dejando un reborde libre en cada uno de los cuerpos del molde recubiertos- repeat the coating process for the other mold bodies, leaving a free edge on each of the coated mold bodies
- ensamblado de los diferentes cuerpos del molde solapándose entre sí los rebordes libres de fibra de carbono o fibra de vidrio dejados en cada una de las piezas de los moldes.- Assembling the different bodies of the mold overlapping each other the free edges of carbon fiber or fiberglass left in each of the pieces of the molds.
Una vez realizados estos pasos, la pieza se puede curar en horno o autoclave. En caso de realizarse en autoclave las fases subsiguientes serian:Once these steps have been completed, the piece can be cured in an oven or autoclave. In case of being carried out in an autoclave, the subsequent phases would be:
- introducción de una bolsa hermética a vacío en el interior del molde- introduction of a hermetic vacuum bag inside the mold
- Curado con calor de la pieza en autoclave- Heat curing of the piece in an autoclave
- Apertura del o de los cuerpos del molde y extracción de la pieza compleja en un único cuerpo - Opening of the bodies of the mold and extraction of the complex piece in a single body
Para lograr este procedimiento se utilizan un sistema de moldes modular que permita la construcción de un soporte para el laminado y curado de las piezas complejas a obtener, por ejemplo, de la forma de las garras de un robot, que sea fácilmente configurable, desmontable y reutilizable.To achieve this procedure, a modular mold system is used that allows the construction of a support for laminating and curing the complex parts to be obtained, for example, in the shape of a robot's claws, which is easily configurable, removable and reusable.
Por tanto, el molde final se realiza componiendo los moldes modulares y por tanto la inversión en moldes se puede distribuir entre todas las estructuras laminadas y curadas gracias a este sistema, reduciendo el coste de fabricación. Estos moldes modulares se unen mediante tornillos, bridas o medios de sujeción adecuados para formar un cuerpo de molde monopieza.Therefore, the final mold is made by composing the modular molds and therefore the investment in molds can be distributed among all the laminated and cured structures thanks to this system, reducing the manufacturing cost. These modular molds are joined by means of screws, flanges or suitable fastening means to form a one-piece mold body.
A titulo de ejemplo, pero no limitativo, se pueden usar los moldes siguientes:By way of example, but not limitation, the following molds can be used:
- Tramos rectos de diferentes longitudes- Straight sections of different lengths
- Codos a 90°- Elbows at 90°
- Tramos e forma de "T”- Sections in the form of "T"
- Tramos en forma de "X”- Sections in the form of "X"
- Tramos en 3D con forma de "Y”- Sections in 3D in the shape of a "Y"
- Tramos en 3D con forma de "X” y de "T”- Sections in 3D in the shape of "X" and "T"
- Tramos en forma de doble "X” y "T”- Sections in the form of double "X" and "T"
- Etc....- Etc....
Estas piezas de molde podrían tener secciones tubulares:These mold parts could have tubular sections:
- Cilindrica- Cylindrical
- Triangular, cuadrada- Triangular, square
- Rectangular, hexagonal- rectangular, hexagonal
- Octogonal,- Octagonal,
- Etc.... - Etc....
De igual forma podrían realizarse moldes de diferentes tamaños para conseguir piezas de tamaños mas pequeños o más grandes.In the same way, molds of different sizes could be made to obtain pieces of smaller or larger sizes.
También habría moldes que permitan la transición entre diferentes tamaños e incluso entre secciones de diferente geometríaThere would also be molds that allow the transition between different sizes and even between sections of different geometry.
Una vez conformado el molde mediante la unión de los moldes con las diferentes formas, se procede al recortado de las piezas laminares de fibra de carbono o fibra de vidrio, mediante una pieza monolítica, de tal forma que quede el molde recubierto y la fibra de carbono o fibra de vidrio deje un reborde de solapamiento que sobresale de los limites del molde. Las solapas o rebordes libres de la fibra de carbono o fibra de vidrio varían entre un mínimo de 3 mm y un máximo de 12 mm y preferentemente entre 5 y 10 mmOnce the mold is formed by joining the molds with the different shapes, we proceed to cut the laminar pieces of carbon fiber or fiberglass, by means of a monolithic piece, in such a way that the mold is covered and the fiberglass remains. Carbon or fiberglass leaves an overlapping lip that protrudes beyond the edges of the mold. The flaps or free edges of the carbon fiber or fiberglass vary between a minimum of 3 mm and a maximum of 12 mm and preferably between 5 and 10 mm.
La fibra de carbono empleada es preimpregnada de resinas como la mas apropiada para esta aplicación a través de moldes, pudiéndose aplicar una o múltiples capas de fibra de carbono o fibra de vidrio.The carbon fiber used is pre-impregnated with resins as the most appropriate for this application through molds, being able to apply one or multiple layers of carbon fiber or fiberglass.
El acabado del molde o mejor dicho de los moldes simples modulares, se hará con un aspecto especular lo que conseguirá dos efectos fundamentales, el primero el acabado exterior de la fibra de carbono o de vidrio será brillante y en segundo lugar el desmoldeo se verá favorecido por ese acabado.The finish of the mold, or rather of the simple modular molds, will have a specular appearance, which will achieve two fundamental effects: firstly, the external finish of the carbon fiber or glass will be shiny and secondly, demoulding will be favored. for that finish.
Este procedimiento se ha mostrado ventajoso para producir garras de robot que adoptan formas complejas que deben tener una alta resistencia para coger piezas y que deben tener un peso reducido, lo cual ahorra en energía del propio robot, siendo posible utilizar motores menos potentes para movimiento de las garras de los robots, lo que redunda en un consumo energético menor de los propios robots, uniéndose a este ahorro el hecho de que en cadenas de producción donde existen cientos de robots, el ahorro energético de los mismos, por el simple hecho de la disminución del peso de las garras del robot se convierte en un ahorro de miles de euros de consumo eléctrico.This procedure has proven to be advantageous for producing robot grippers that take on complex shapes that must have high resistance to pick up parts and that must have a reduced weight, which saves on energy for the robot itself, making it possible to use less powerful motors for moving the parts. the claws of the robots, which results in a lower energy consumption of the robots themselves, adding to this saving the fact that in production lines where there are hundreds of robots, their energy savings, due to the simple fact of Reducing the weight of the robot's claws translates into savings of thousands of euros in electricity consumption.
A titulo de ejemplo podemos decir que una garra de robot realizada con fibra de carbono pesa la decima parte de una garra similar de acero y la cuarta parte de una garra realizada de aluminio. Esto conlleva que los servomotores empleados tienen que mover un peso en vacío de la garra mucho menor y necesitar servomotores con la mitad de potencia que se necesitaría con garras de acero equivalentes y de ahí el ahorro eléctrico tan importante que conlleva.By way of example we can say that a robot claw made of carbon fiber weighs one tenth of a similar steel claw and one fourth of a claw made of aluminum. This means that the servomotors used have to move a much lower jaw empty weight and need servomotors with half the power that would be needed with equivalent steel jaws, hence the significant electrical savings that this entails.
La invención comprende piezas complejas monopieza realizadas de fibra de carbono o de fibra de vidrio. The invention comprises complex one-piece parts made of carbon fiber or fiberglass.
BREVE DESCRIPCIÓN DE LAS FIGURASBRIEF DESCRIPTION OF THE FIGURES
Con objeto de ayudar a una mejor comprensión de las características de la invención y para complementar esta descripción, se acompañan como parte integrante de la misma las siguientes figuras, cuyo carácter es ilustrativo y no limitativo:In order to help a better understanding of the characteristics of the invention and to complement this description, the following figures are attached as an integral part thereof, the nature of which is illustrative and not limiting:
La figura 1 muestra sendas piezas realizadas de un único cuerpo que constituirá la base de una garra de robot.Figure 1 shows individual pieces made from a single body that will constitute the base of a robot claw.
La figura 2 muestra la garra de un robot y en la que puede verse el núcleo central de la misma que es el cuerpo de fibra de carbono de la figura 1Figure 2 shows the claw of a robot and in which the central core of the same can be seen, which is the carbon fiber body of figure 1.
La figura 3 muestra el molde cerrado y construido mediante la unión de dos moldes más simples modulares, en cuyo interior se introduce a vibra de carbono, fibra de vidrio o similar.Figure 3 shows the closed mold and built by joining two simpler modular molds, inside which a carbon, fiberglass or similar vibra is introduced.
La figura 4 muestra un detalle de la unión entre dos moldes más simples, para formar el molde complejoFigure 4 shows a detail of the union between two simpler molds, to form the complex mold.
La figura 5 muestra el molde complejo abierto por su mitad y en disposición de ser recubierto interiormente por la fibra de carbono o fibra de vidrioFigure 5 shows the complex mold open in the middle and ready to be covered on the inside by carbon fiber or fiberglass.
La figura 6 muestra sobre la superficie plana de la tela de fibra de carbono o fibra de vidrio el dibujo desarrollado para cortar y cubrir interiormente las partes de cada semimoldeFigure 6 shows on the flat surface of the carbon fiber or fiberglass cloth the drawing developed to cut and cover the parts of each semi-mold on the inside.
La figura 7 muestra el recubrimiento interior de los semimoldes y como queda la pestaña perimetral de ensamblaje de la pieza construida con ambos semimoldesFigure 7 shows the interior lining of the half-molds and how the perimeter flange for assembly of the piece built with both half-molds looks like.
La figura 8 muestra un detalle de la pestaña lateral de solapamiento entre las láminas de fibra de carbono que recubren cada semimoldeFigure 8 shows a detail of the overlapping side flange between the sheets of carbon fiber that cover each half-mold.
La figura 9 muestra el molde abierto con la pieza interior de fibra de carbono ya curada. Figure 9 shows the open mold with the interior part of carbon fiber already cured.
DESCRIPCIÓN DETALLADA DE UN MODO PREFERIDO DE REALIZACIÓN DE LA INVENCIÓNDETAILED DESCRIPTION OF A PREFERRED MODE OF CARRYING OUT THE INVENTION
En las figuras 1 y 2 se muestran respectivamente, el cuerpo principal (2) de la garra del robot formado por un cuerpo en forma de "T” y una garra de robot (1), para ver donde se integra este cuerpo principal. Este cuerpo principal (2) se hace en forma de un cuerpo monolítico de fibra de carbono, sin necesidad de formarse mediante piezas más pequeñas pegadas, de tal forma que la resistencia es muy elevada.Figures 1 and 2 respectively show the main body (2) of the robot claw formed by a "T"-shaped body and a robot claw (1), to see where this main body is integrated. This The main body (2) is made in the form of a monolithic carbon fiber body, without the need to be formed by glued smaller pieces, in such a way that the resistance is very high.
Para la construcción de este cuerpo principal (1) de la garra del robot, que será un cuerpo monolítico, se hace mediante la unión de moldes más simples y modulares, como se muestra en la figura 3, donde se emplean un molde de tramo recto (3) que se une a un molde en forma de "T” (4), unidos entre si con la ayuda de bridas (5) y tornillos de fijación (6) de las bridas.For the construction of this main body (1) of the robot claw, which will be a monolithic body, it is done by joining simpler and more modular molds, as shown in figure 3, where a straight section mold is used. (3) that is attached to a "T"-shaped mold (4), joined together with the help of flanges (5) and fixing screws (6) of the flanges.
De igual modo, el molde se realiza en este caso en forma de dos mitades, uniéndose ambas mitades por medio de los tornillos (7) de unión de los semimoldes. Cada uno de los moldes más simples, se puede observar que acaba en bridas para unirse a otros moldes para formas figuras más complejas.In the same way, the mold is made in this case in the form of two halves, joining both halves by means of the screws (7) for joining the half-molds. Each of the simpler molds can be seen ending in flanges to join other molds to form more complex figures.
En la figura 4 se muestra un detalle ampliado de un semimolde, formado por la unión de dos semimoldes, uno de tramo recto y otro en forma de T, unidos por las bridas (5) mediante tornillos de fijación (6). Al tratarse de un semimolde, se observan los orificios (8) a través de los que se introducirán los tornillos de fijación de los semimoldes, tornillos que no son mostrados en tales figuras.Figure 4 shows an enlarged detail of a half-mold, formed by the union of two half-molds, one with a straight section and the other in the shape of a T, joined by the flanges (5) by means of fixing screws (6). As it is a semi-mold, the holes (8) can be seen through which the fixing screws of the semi-molds will be inserted, screws that are not shown in such figures.
En la figura 5 se representa el semimolde de la figura 4, pero por la parte cóncava, que se recubrirá con la fibra de carbono o fibra de vidrio y como en esta figura se observa la huella y forma externa que adoptará la fibra de carbono o de vidrio cuando se ajuste al interior del molde. Es esta figura se observa, que el acabado interior del molde sea un acabado especular que se transmitirá en forma de un acabado muy fino a la superficie de la pieza realizada y que a su vez este acabado especular facilite el desmoldeo del cuerpo moldeado.Figure 5 represents the semi-mold of figure 4, but for the concave part, which will be covered with carbon fiber or fiberglass and, as in this figure, the footprint and external shape that the carbon fiber or fiber will adopt glass when it fits inside the mold. In this figure, it can be seen that the interior finish of the mold is a specular finish that will be transmitted in the form of a very fine finish to the surface of the piece made and that, in turn, this specular finish facilitates demoulding of the molded body.
En la figura 6 se muestra una lámina de fibra de carbono o vidrio (9), tal y como se suministra y sobre la que se ha recortado un contorno de la pieza a recortar (10), que será un contorno en 2D, de tal modo que permita su adaptación a la forma 3D del molde. Esta pieza recortada (12) es la que se adapta a los semimoldes (11) mostrados en la figura 7 y que dejará unos rebordes (13) que sobresalen de la forma de los semimoldes, facilitando el solapamiento entre si de las piezas recortadas (12) que se adaptan a cada uno de los semimoldes (11).Figure 6 shows a sheet of carbon or glass fiber (9), as supplied and on which a contour of the piece to be cut (10) has been cut, which will be a 2D contour, in such a way that so that it can be adapted to the 3D shape of the mould. This The cutout piece (12) is the one that adapts to the half-molds (11) shown in Figure 7 and will leave some ridges (13) that protrude from the shape of the half-molds, facilitating the overlapping of the cutout pieces (12). that adapt to each of the semi-molds (11).
En esta figura se observa que la pieza recortada (12), e incluida en cada semimolde, una lleva reborde (13) y la otra no, pero es indiferente, pudiendo llevar incluido las dos piezas recortadas (12) los rebordes (13) pertenecientes a cada uno de los semimoldes (11).In this figure it can be seen that the cutout piece (12), and included in each half-mold, one has a rim (13) and the other does not, but it is indifferent, the two cutout pieces (12) being able to include the rims (13) belonging to to each of the semi-molds (11).
En la figura 8 se muestra con mayor detalle, el semimolde (11) y cómo la pieza recortada (12) de fibra de carbono o fibra de vidrio, queda formando el reborde (13) perimetral en el interior del semimolde (11).Figure 8 shows in greater detail the semi-mold (11) and how the cut piece (12) of carbon fiber or fiberglass forms the perimeter rim (13) inside the semi-mold (11).
Finalmente, en la figura 9 se muestra el molde abierto y como se ha formado el cuerpo principal (2) de la garra del robot, al haberse curado la fibra de carbono o de vidrio así realizada.Finally, figure 9 shows the open mold and how the main body (2) of the robot's claw has been formed, having cured the carbon or glass fiber thus produced.
A la vista de esta descripción y figuras, el experto en la materia podrá entender que la invención ha sido descrita según algunas realizaciones preferentes de la misma, pero que múltiples variaciones pueden ser introducidas en dichas realizaciones preferentes, sin exceder el objeto de la invención tal y como ha sido reivindicada. In view of this description and figures, the person skilled in the art will be able to understand that the invention has been described according to some preferred embodiments thereof, but that multiple variations can be introduced in said preferred embodiments, without exceeding the object of the invention as such. and as it has been claimed.
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| Application Number | Priority Date | Filing Date | Title |
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| ES202130394A ES2928104A1 (en) | 2021-05-04 | 2021-05-04 | Procedure for making complex pieces of carbon fiber, fiberglass or similar (Machine-translation by Google Translate, not legally binding) |
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| US20190232571A1 (en) * | 2016-06-22 | 2019-08-01 | Lm Wind Power Us Technology Aps | Wind Turbine Blade with Improved Glue Joints and Related Method |
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| US6264877B1 (en) * | 1997-03-12 | 2001-07-24 | Alternatives Energies | Method of making a part of large dimensions out of composite material |
| US6540954B1 (en) * | 1999-07-30 | 2003-04-01 | Resolute Racing Shells, Inc. | Process for fabricating a rowing shell |
| CN101733936A (en) * | 2008-11-17 | 2010-06-16 | 核工业第八研究所 | Method for making carbon fiber composite material rectangular thin-wall hollow pipe for robot arm |
| US20140166208A1 (en) * | 2011-06-27 | 2014-06-19 | Iq Tec Switzerland Gmbh | Preforming pre-preg |
| US20190232571A1 (en) * | 2016-06-22 | 2019-08-01 | Lm Wind Power Us Technology Aps | Wind Turbine Blade with Improved Glue Joints and Related Method |
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