JP4898839B2 - Method for manufacturing a three-dimensional frame structure for use as a core structure in a sandwich structure and the frame structure manufactured thereby - Google Patents

Abstract

Producing a three-dimensional framework comprises producing a two-dimensional lattice structure from rods that cross at defined points, bonding the rods together at the crossing points, softening the rods by local heating along groups of three nonintersecting straight lines, and applying force along the middle of each three straight lines. Independent claims are also included for: (1) framework for a sandwich structure produced as above; (2) aircraft with a structural component comprising a composite material with a core structure produced as above.

Description

  This application claims the priority of German Patent Application No. 10 2006 008 728.3 filed on February 24, 2006 and US Provisional Application No. 60 / 776,524 filed on February 24, 2006, The disclosure content of the application is incorporated herein by reference.

  The present invention relates to the technical field of composite materials, and more particularly to a method for manufacturing a three-dimensional framework structure that can be used as a core structure in a sandwich structure. Furthermore, the present invention relates to a framework structure in a sandwich structure manufactured by a method according to the present invention and to an aircraft in which a core structure includes components of a sandwich structure manufactured by a method according to the present invention.

  Due to the good ratio of stiffness or strength to density, composite materials, especially sandwich structures, have a wide range of applications in the field of aircraft construction. Generally speaking, a sandwich structure consists of upper and lower cover layers, between which there is a honeycomb core structure, for example consisting of vertically hexagonal cross-section expanded cells, for the purpose of enhancing rigidity.

  As an alternative to structures including honeycomb structures, rigid porous materials can be used. However, a sandwich structure comprising a rigid porous material core has the disadvantage that the mechanical properties are somewhat inferior when comparing the sandwich structure with the honeycomb core structure and equivalent density. To compensate for this, fibers, yarns, or pultruded framework semi-finished products are incorporated into rigid porous materials at defined angles and defined densities. In the permeation process of the fiber or yarn and the subsequent resin, the fiber contributes to the mechanical reinforcement of the porous material. In this case, the porous material not only acts as a carrier that holds the pin in place in the form of resin reinforced fibers or yarns, but also prevents or at least delays the buckling or collapse of the pin when loaded. To stabilize.

  However, existing porous cores are generally unnecessary because the load carrying capacity of such reinforced rigid porous materials is unambiguously determined by the pins introduced or pultruded frame semi-finished products. There is a tendency to contribute to an increase in density of the core structure. In addition, reinforced porous material structures generally have a few narrow regions that are elastic to loads, as damage to composite materials generally tends to be plastic and permanent. Finally, since the space between the cover layers is completely filled with rigid porous material, aeration or dehydration of sandwich structures with reinforced rigid porous material is not possible.

  From Patent Document 1 and Patent Document 2, for example, a method of manufacturing a three-dimensional lattice structure is known. There, a metal grid structure is first generated that is bent in a three-dimensional direction by a lower mold and an accompanying upper mold so that a three-dimensional grid results. During this bending, the outer edge of the metal grid mat is not held in place because it hinders bending in the three-dimensional direction. However, this bending with the lower mold and the accompanying upper mold is relatively inflexible. This is because changing the angle of the grating structure and changing the height of the grating structure requires a change in the lower mold and the accompanying upper mold.

Patent Document 3 also describes a manufacturing process of a three-dimensional lattice structure used for a sandwich structure as a core structure. In this method, first, the planar lattice structure is formed of a metal plate, and then, in order to change the three-dimensional shape to the above-described planar lattice structure, the lattice structure is again formed by the molding process and the lower mold and the accompanying mold. Bent by the upper mold.
International Publication No. WO 2004/022869 International Publication No. WO 03/101721 U.S. Pat. No. 3,884,646

  The three-dimensional lattice structure manufactured according to the above literature does not have the disadvantages of the core structure reinforced with the porous material, but the manufacturing method for manufacturing the three-dimensional lattice structure is as described above. Since the lower mold and the upper mold are used, there is relatively no flexibility.

  In particular, it is necessary to describe a method for producing a three-dimensional framework structure, for example in the form of a rigid porous material, without using a carrier member. Therein, this framework structure is more flexible than the above-described method using the lower mold and the upper mold in terms of manufacturing various lattice geometries.

  Within the context of the present invention, “bar-shaped linear semi-finished product” means a bar-shaped geometry with a clear cross-section that is pultruded, extruded or stretched. The cross section may then be, for example, circular, triangular, rectangular, hexagonal, tubular, or similar geometric shape. Semi-finished products can be produced with or without reinforcing fibers for reinforcement. Semi-finished products are, for example, 1) extruded thermoplastics, 2) partially cross-linked, pultruded polymers, in particular thermosetting plastic materials, or duromers, 3) pultruded metals or ceramics , In particular precursor ceramics, in which the thermoplastics or thermosetting plastic materials may additionally contain reinforcing fibers.

  According to a first aspect of the present invention, the object of the present invention is achieved by a method for manufacturing a three-dimensional framework structure, wherein as a first step, a two-dimensional generated from a rod-shaped linear semi-finished product. A lattice structure is manufactured. In this way, this linear semi-finished product may be supplied as a continuous material. In this process, the linear semi-finished products are arranged so that they intersect at defined intersections to form a two-dimensional lattice structure. For example, first of all, the first layer of linear semi-finished products can be arranged such that the individual rod-shaped linear semi-finished products extend in parallel with each other as a group in the layer. Thereafter, a second layer of linear semi-finished products, extending parallel to each other as a group, is arranged on the first layer. There, the linear semi-finished product is arranged at a different angle from the first layer so that the linear semi-finished products of the two layers intersect at a defined intersection. A lattice structure initially formed from rod-shaped linear semi-finished products that are not joined together can form a uniform pattern, but this is not essential. In a further manufacturing process, the bar-shaped linear semi-finished products are then interconnected at the intersections. This connection can be made, for example, by point contact heating in the area of the intersection so that the semi-finished products become soft and slightly adhere to each other. In a further step, the bar-shaped linear semi-finished products are softened so that they become somewhat sticky or sticky. This softening can be done, for example, by locally heating the lattice structure along three virtual non-intersecting straight lines. The heating of the two-dimensional lattice structure can be performed, for example, along a first group of imaginary non-intersecting straight lines and similarly along a second group of imaginary non-intersecting straight lines. Here, the straight lines of the first group and the straight lines of the second group extend alternately. In other words, in any case, one straight line of the second group is located between two straight lines of the first group, and one straight line of the first group is two straight lines of the second group. Located between.

  A force is then applied to the lattice structure along a straight line intermediate the heated virtual straight line so that the lattice structure deforms from its two-dimensional plane in order to transfer the desired three-dimensional structure to the lattice structure. As a result of the deformation of the lattice structure, the introduced force is deflected into a pair of tensions acting on the semi-finished product, so that the lattice structure is in a three-dimensional direction along an imaginary straight line in the middle of the heated line Be drawn into. This process involves a deep drawing process in which the semi-finished material is not stretched. Instead, the lattice structure becomes shorter in the plane as a result of deformation in the three-dimensional direction. In order to prevent the lattice structure from being randomly displaced when a force is applied, the straight line located at the boundary of the lattice structure or in the middle straight line may be held by a movable bearing. This ensures that the applied force can be converted or decomposed into the target tensile force in the semi-finished product.

  In the process in which force is applied to the lattice structure, the two-dimensional lattice structure is transformed into a three-dimensional folded structure by the formation of peaks and valleys that are continuously and repeatedly repeated. In this process, the mountain is located on the straight line of the first group. On the other hand, the deepest part of the valley is located on the second group of straight lines. In this document, the terms “mountain” and “valley” both relate to the cross-section of the three-dimensional folded structure being created. There, the peaks and valleys of the fold structure are obvious. In the perspective view, when viewed with respect to the surface of the lattice structure, mountains and valleys are interpreted as “mountains” or ridges and “valleys” between them. In this process, peaks and valleys are formed in two groups of straight, linear regions where forces are alternately applied to the lattice structure in the direction of the high and low positions that are formed. By applying a force in the direction of the high and low positions that are formed, the two-dimensional lattice structure is deformed from the plane. As a result, the above-described mountain range having valleys is formed along the straight line of two groups of straight lines. As a result of the forces acting on the semi-finished product of the lattice structure, the two-dimensional lattice structure deforms from a plane along two straight groups of straight lines. As a result, peaks and valleys are formed in the desired manner. A force applied to the lattice structure “along” a straight line means that the force is applied essentially perpendicular to the lattice structure and the force is distributed along the straight line.

  In order to carry out the method optimally for the time required, the above process is repeated for the connection to the intersection of the bar-shaped linear semi-finished product, the softening of the bar-shaped linear semi-finished product, and the introduction of force. It can be implemented in a continuously flowing way, with a continuous way going to a point in the direction. In particular, it is convenient to connect rod-shaped linear semi-finished products when they are softened. This is because these products become somewhat sticky due to the softening process and thus adhere to each other when a semi-finished product is placed on another semi-finished product. Of course, the softening of the bar-shaped linear semi-finished product needs to be performed in the region of the intersection so that the rod-shaped linear semi-finished products are connected to each other in the region of the intersection. The continuous repetitive manufacturing process is characterized in that heating is performed on further virtual straight lines of the lattice structure and forces are applied along these straight lines in order to deform the lattice structure in the direction of manufacture in the continuous process. Have.

  Further, force can be applied while the lattice structure is heated along three non-intersecting straight lines to optimize the manufacturing process. As a result of this heating, plastic deformation along the aforementioned straight line of the lattice structure can be performed in a targeted manner by applying force.

  If for the reasons of statics and the desired structure, the intersection in the three-dimensional direction of the rod-shaped linear semi-finished product forms the outer boundary of the three-dimensional framework structure to be created, the heating is related to the direction of manufacture. You may carry out so that a heat may be simultaneously added to the intersection arrange | positioned so that it may become perpendicular | vertical. These intersections arranged perpendicular to the direction of manufacture are adjacent to the intersections where the various linear semi-finished products of the lattice structure intersect. The introduction of force into the lattice structure is always performed along one of the three straight lines, and heating to the lattice structure is performed along the straight line. As a result of the displacement of the force due to the deformation to the tensile force acting in the semi-finished product, the heated intersection is attracted in the desired three-dimensional direction, which becomes the outer boundary of the three-dimensional framework structure in the three-dimensional direction.

  As mentioned above, the connection at the intersection of the bar-shaped linear semi-finished products is made during and as a result of the parallel heating to the intersection located so as to be perpendicular to the direction of manufacture. . This is preferred when the heating is carried out in parallel to the intersections arranged to be perpendicular to the direction of manufacture. This is particularly advantageous in the case of this kind of heat. As the linear semi-finished products of the individual layers soften in the intersection area, and as a result of their contact (and as a result of the forces involved (eg gravity), if applicable), each other Combined.

  According to a particular aspect of the invention, a three-dimensional folded structure is formed. In a continuous iterative process, forces are repeatedly introduced into the grid structure along each of the second imaginary straight lines, heat is applied to the straight lines, and the forces are directed through the semi-finished product to the desired depth in three dimensions. Pull towards. In this process, the lattice structure plane is deformed so that two straight lines aligned with the intermediate straight line where heating is performed approach each other in the planar shape, and as a result, a folded structure having a “consertina” shape is generated. The Of course, along with every second straight line heated against applying a negative three-dimensional force to every heated first, third, fifth, etc. straight line. It is also possible to apply a three-dimensional positive force to the lattice structure. Thereby, a zigzag folded structure can be formed.

  Compared to known methods using lower molds and upper molds, the method according to the present invention is very flexible. As a result of the force being applied along a straight line to which heat is applied, any desired individual thickness or any desired strength of the three-dimensional framework structure can be generated. For example, force and heat can be applied by a heatable end that is movable in three dimensions. Here, it can be applied. There, a variable thickness of the skeleton structure is formed according to the depth at which the end part advances in the three-dimensional direction. Therefore, for example, the thickness of the three-dimensional framework structure can be continuously changed by moving the end portions to different three-dimensional ranges in order to deform the lattice structure at different positions of the lattice structure.

  In order to securely connect the rod-shaped linear semi-finished product at the intersection, heating is performed to soften the rod-shaped linear semi-finished product along the intersection located so as to be perpendicular to the production direction. Force can be introduced while in the area of the intersection, a small area of material is formed on the semi-finished product, which acts as a positive side effect, The folding performance of the product can be enhanced.

  In the above, a method for manufacturing a three-dimensional framework structure is described, where the straight lines on which the two-dimensional lattice structure is folded generally do not intersect. However, in order to form a three-dimensional lattice structure as regularly as possible, it is also possible to heat the lattice structure along parallel (virtual) straight lines and to introduce forces into the lattice structure in the above-mentioned straight lines It is.

  In order to facilitate the transformation of the two-dimensional lattice structure into three dimensions, in a further step, the preform is pre-formed into a semi-finished product in a three-dimensional direction, along the heated straight line, in the production direction to be formed later Can give indentations. The step of providing the pre-formed indentation may occur in a completely separate step, with an edge-shaped impression tool provided specifically for this purpose. As an alternative to this, the preformed recess may also be imprinted on the semi-finished product with a movable edge and a superheatable edge. By imprinting preformed indentations in the region of intersection, the bar-shaped linear semi-finished product is separated at the intersection at individual points so that the material thickness is quasi doubled at these intersections. Because of the crossing in the layers, these thickened parts can be reduced or all removed in the case of a thermoset semi-finished product. In particular, the welding method for joining can be used in the case of thermosetting semi-finished products

  In order to increase the resistance moment of the three-dimensional frame structure manufactured by the above-described method so that the frame structure is sensitive to bending deformation, in a further method-related step, the cover layer is ( The cover layer can be attached (eg, glued) to at least one side of the manufactured spatial framework structure so as to be in extreme contact with each side of the framework structure (which is drawn in three dimensions). These cover layers therefore have a compressive force generated as a result of the application of the bending moment so that the three-dimensional frame structure does not deform itself or only slightly when it is affected by the bending moment. And absorb tension. In order to make the cover layer less sensitive to shear loads or shear deformation associated with a three-dimensional framework structure, in particular to increase the transmitted shear load in addition to the above-mentioned attachments. The layers can be extremely stitched on each side of the framework structure by a stitching process, and in particular, one-side stitching methods can be used. Alternatively, the cover layer can also be fixed to the framework structure, in that the teeth of the fixing combs are pressed along its extremes through the framework structure to the cover layer, where the teeth Is finally secured to the cover layer as a result of curing of the resin.

  As described above, the method according to the present invention for producing a three-dimensional framework structure is used to achieve a reduction in the density of the core structure compared to the design of the core structure using a rigid porous material. be able to. This is because it is not necessary to provide such a rigid porous material in the method according to the present invention. Furthermore, the method according to the present invention can be used to form an open structure. Is characteristic in that it can be easily dried, ie easily aerated or drained. In addition, because of the open design of the structure, the placement of cables through the structure would occur without that design, as a result of the designed passage, which would compromise the mechanical integrity of the structure. It won't cause any problems.

  When compared to a core structure using a rigid porous material, the three-dimensional framework structure produced using the method according to the present invention has a wide range of features so that it is not damaged by plastic deformation or only slightly. Is further characterized by elastic deformation. Instead, when affected by an overload, the individual grids in the folded wire semi-finished product can be elastically broken, so that improved durability against damage can be achieved.

  This is because, in the method according to the present invention, it is possible to use pultrusion or a shape having a clear cross-section (triangle, quadrangle, hexagon, cavity, tube, circle) continuously drawn and pultruded. As such, architects or designers who are involved in the construction can select individual 3D framework structures in a way that suits the purpose by aiming and selecting a clear framework shape. There is further the option to modify the lattice buckling behavior.

  The method can be carried out in a continuously flowing method by changing the speed of extrusion or stretching, or by modifying the angle in the lattice structure, so that slope formation, density differences, and 3 Differences in the thickness of the dimensional framework structure can be achieved.

  This is because the lower and upper mold arrangements known from the prior art are not used in bending the two-dimensional lattice structure in three dimensions, and the process flexibility can be improved. This is because when using an upper mold and a lower mold, both the upper mold and the lower mold must be changed so that the bending angle and the height of the structure can be changed. Using the method according to the invention, such changes in bending angle and structure height use heatable edges that can be bent in three dimensions (edges move to different depths in three dimensions). Can be achieved.

  In the following, the present invention will be described in more detail with reference to the accompanying drawings. It should be emphasized that the accompanying drawings are provided only for the purpose of illustrating exemplary embodiments and in particular should not be construed as limiting the scope of the invention in any way. .

  Throughout the figures, the same reference characters are used for the same or corresponding elements.

  FIG. 1 shows, in the exemplary embodiment shown in the figure, a two-dimensional lattice structure formed from two groups of rod-shaped linear semi-finished products 2, where first group 2 consists of semi-finished products. It extends in parallel and is arranged to be spaced from each other in the first layer. Next, the second group 3 of the rod-shaped linear semi-finished products 3 is divided into the second group of individual rod-shaped linear semi-finished products 3 on the first layer 2 and in the second layer. They are arranged on the first layer so as to be spaced apart from each other and extend in parallel. As a result of the above-described arrangement of the first group 2 and the second group 3 rod-shaped linear semi-finished products, a two-dimensional lattice structure 1 is formed, in which two layers of individual rod-shaped linear semi-finished products are formed. Intersect at a predetermined position of intersection 4.

  For example, wire semi-finished products may be pultruded (partially cross-linked) thermosetting materials, extruded thermosetting materials, continuously drawn and pultruded metals or ceramics, especially ceramics Including precursors, where different cross-sectional geometries can be used.

  In order to ensure the shape of the lattice structure formed in the above-described method for the following forming steps, the two layers 2 and 3 of the rod-shaped linear semi-finished product are interconnected at the intersection point 4; For example, it can occur by heating or, if possible, by applying corresponding forces along the straight lines 5 and 6 shown in dashed lines in FIG. In this process, the connection is continuous and sequential in the production direction 7. In this continuous process in the production direction, the intersection points 4 extending on the straight lines 5 and 6 which are substantially perpendicular to the production direction are simultaneously exposed to heat. As a result of the heating, the semi-finished products are slightly heated at the intersection 4 and the products are slightly sticky. That is, they are interconnected because of their stickiness.

  In a further related process step, the rod-shaped linear semi-finished products 2 and 3 can then be softened in groups along three non-intersecting straight lines 5 and 6, for example by local heating to the lattice structure 1 Can be generated. Since the process of connecting the rod-shaped linear semi-finished products at the intersection 4 can be caused by heating, the lattice structure 1 has three lines indicated by broken lines in FIG. 1 (these lines interconnect the intersection 4 and the production direction It is expedient to combine the joining and softening of the rod-shaped linear semi-finished product in one step so that it is softened along (extends perpendicular to 7).

  In a later deformation step, in order to facilitate the manufacture of the three-dimensional lattice structure 1, indentation preforms may be applied to the semi-finished products 2, 3 in an intermediate step as shown in FIG. As shown in FIG. 2, a small dent is provided in the lattice structure 1, and the dent 9 extends in a direction in which the lattice structure 1 is subsequently drawn into three dimensions. In this arrangement, the recess 9 is positioned equally on the straight lines 5, 6, and heat is applied along the straight lines 5, 6 to the bar-shaped linear semi-finished products 2, 3 softened from the lattice structure 1. Preferably, the softening of the bar-shaped linear semi-finished products 2, 3 is carried out in such a way that heat can be applied to the area of the intersection 4 of these semi-finished products 2, 3, so As a result of the application of 9, the thickened part of the material in the region of the intersection 4 can be reduced or the state that the thermoplastic semi-finished product can be completely removed can be achieved.

  As shown in FIG. 3, in a further method-related step, a force F is introduced into the grid structure 1 along the central straight line of the three virtual lines and heat is applied thereto. The introduced force F causes the lattice structure 1 to deform in three dimensions, and the introduced force F is deflected into a pair of tensions F ′ and F ″ acting on the semi-finished product, as shown in the intermediate state of FIG. Is done. Such force decomposition or such deflection is illustrated in another force parallelogram shown in FIG. In this way, tension is thus introduced into the semi-finished product, which pulls the lattice structure along a central straight line where heat is applied in three dimensions.

As further shown in FIG. 3, the grating structure after the three-dimensional framework along Nozomu linear 5,6 where represents the previous end of, during the double beam 10 that can perform three functions simultaneously pinching Murrell. Therefore, these double beam 10 can adapt so as to be moved toward the heating can, and 3-dimensional. In this way, individual layers of linear semifinished products 2, 3 bar shaped lattice structure 1 may be mutual connection using a double beam 10. However, double beam 10 along the intersection 4 adjacent to a work on the lattice structure 1. By heating the double beam 10, heat is applied to the grid structure 1 , i.e. at the intersection 4, so that the rod-shaped linear semi-finished products 2, 3 are softened at their positions and interconnection points. The action of intersection 4 smell Te connecting linear semifinished products 2, 3 of the bar-shaped is double-beam 10 is pressurized against each other, as a result, advantageous manner odor Te, is desired of the material at the intersection 4 It can be further supported in that the thickened parts that are not can be reduced . Furthermore, depending on the mutual pressure of da Burubimu 10 can impart Oite, preformed depressions 9 in the semi-finished product in the forming direction is formed later three-dimensional directions. And this is due to the introduction of force into the lattice structure 1, it is possible to facilitate the formation. To burn them finally pull the lattice structure to 3D via the edge 8, Da Burubimu 10, along a central straight line of the three straight lines 5, 6 which heat is given, in the lattice structure Power can be introduced. Then, the lattice structure 1 is deformed into three dimensions as shown in FIG. 3 as a result of the force decomposition described above. During the degradation of the force in the direction of the workpiece, defining the tension F ', F' to be allowed actually produce 'double beam 10 is firmly clamp the lattice structure along two straight lines 5. However, this arrangement smell Te, Da Burubimu 10, as indicated by the arrows in FIG. 3, it can be moved in the plane of the grating structure 1, as a result of a force F, which is the center of the straight line 6 moves in the direction, that is written can pull in that direction. In this process, the double beam 10 produces a counterforce for dislocations so that tensions F ′ and F ″ can be generated in a targeted manner.

  As explained above, connecting the rod-shaped linear semi-finished products at the intersection 4, softening the rod-shaped linear semi-finished products 2, 3 and introducing force is movable and heatable Can be performed in a common step using a simple double beam 10 arrangement. Here, in the above steps, when the direction of the product 7 is viewed, a continuous flow process and a continuous repetition process can be performed.

  The method according to the present invention, in which a force F is introduced into the lattice structure 1 along the central straight line of the three straight lines 5, 6 to which heat is applied, is particularly suitable for known deformation processes using lower and upper molds. Characterized by the associated flexibility. Thus, the method according to the present invention can be used to produce a three-dimensional framework structure with varying density and thickness. This method allows the arrangement or edge 8 of the double beam 10 to be moved to another three-dimensional depth, and as a result of that process, the thickness dimension of the three-dimensional framework can be changed. Accordingly, there is no need to finely change the arrangement of the lower mold and the upper mold in order to manufacture a three-dimensional framework structure of another depth.

  FIG. 4 shows a three-dimensional frame structure manufactured using the method according to the invention. By the deformation of the two-dimensional lattice structure 1 shown in FIG. 1, a lattice structure including a large number of quadrangular pyramids can be spatially formed, which repeats periodically. In this arrangement, the apex of the pyramid is formed by the intersection point 4 that was previously the two-dimensional lattice structure 1. After the deformation process, the application of heat and introduction of force along the intersection 4 intersects to form an extreme that laterally delimits the three-dimensional framework structure. Again, for illustrative purposes, FIG. 4 shows three straight lines 5, 6 along which the two-dimensional framework structure 1 has been softened at the intersection 4 by the application of local heat previously. As a result of the introduction of force into the lattice structure along the central straight line to which heat is applied, the two-dimensional lattice structure 1 is drawn into three dimensions.

  FIG. 5 finally shows the steps associated with any method, so that on both sides of the three-dimensional framework structure produced in this method, the cover layer 11 is supported at points with pyramidal vertices. To be granted. In order to attach the cover layer 11 to the three-dimensional framework structure, the cover layer may be bonded to the apex of the pyramid. However, the adhesive surface at the apex of the pyramid is only a few, and the cover layer 11 in the form of the apex of the pyramid can be further sewn at the extreme of the three-dimensional framework structure. Preferably, a one-sided suture as shown in FIG.

  In addition, it should be noted that “comprising” does not exclude other elements or steps, and “one (a)” or “one” does not exclude a plurality. Furthermore, it should be noted that the features or steps described with respect to the above exemplary embodiments can be used in combination with other features or steps of the other exemplary embodiments described above. The features referred to in the appended claims should not be construed as limiting.

It is a figure which shows the two-dimensional lattice structure which can be made with a rod-shaped linear semi-finished product. It is a figure explaining the mode of the preforming of the hollow to a semi-finished product. It is a figure which illustrates introduction of force to a lattice structure in order to draw this lattice structure into three dimensions. It is a figure which shows the final product of a three-dimensional support frame structure. It is a figure explaining arrangement | positioning of the cover layer of a three-dimensional frame structure.

Explanation of symbols

1 Lattice structure (two-dimensional)
2 Bar-shaped linear semi-finished products (first group, first layer)
3 Bar-shaped linear semi-finished products (second group, second layer)
4 intersection 5 straight line (first group)
6 straight lines (second group)
7 Manufacturing direction 8 Edge (movable, heatable)
9 Pre-formed indentation 10 Double beam 11 Cover layer 12 Sewing stitch

Claims (15)

Forming a two-dimensional lattice structure (1) in which the semi-finished product (2, 3) intersects at a predetermined intersection (4) from the rod- shaped linear semi-finished product (2, 3);
The front straight semi-finished products Kibogata (2,3), a step of connecting with the intersection (4),
In each case as well, the grating structure along a straight line (5,6) which is not three cross extending along, by the introduction of local heat to the lattice structure, the linear of the bar-shaped Softening the semi-finished product (2, 3);
Introducing a force (F) to the lattice structure (1) along a central straight line of the three straight lines (5, 6) into which heat has been introduced,
As a result of the deformation of the lattice structure (1), the introduced force (F) is deflected into a pair of tensions (F ′, F ″) acting on the semi-finished product (2, 3), the lattice structure (1) is drawn in a three-dimensional direction along the center straight line of said heat is applied three straight lines (5, 6),
A manufacturing method of a three-dimensional framework structure. Step of connecting the linear semifinished products of the bar-shaped (2,3) at the intersection (4), step Ru soften the linear semifinished products of the bar-shaped (2, 3), and introducing said force can run in a continuous flow process, the above process is performed by continuously repeating the process in the direction of production (7) the method of claim 1. The method according to claim 1 or 2, wherein the introduction of the force is performed while heat is applied to the lattice structure (1) along the three non-intersecting straight lines (5, 6). Wherein the intersection positioned to be perpendicular to the direction of production (7) (4), so that heat is applied simultaneously, the introduction of the heat is conducted, any one of claims 1 3 The method described in 1. The bar-shaped linear semi-finished product (2, 3) is connected to the intersection point (4) positioned perpendicular to the production direction (7) at the same time as the intersection point (4). 5. The method of claim 4, wherein the method is performed during and as a result of heating. 3D folded structure, in a continuous, repetitive process, the lattice structure forces along each of the central straight line continuously among the three straight lines which heat is introduced (5,6) (1) produced by Rukoto is introduced into the force, the draw in three-dimensional directions in the semi-finished product the desired depth, the method according to any one of claims 1 to 5. The force and the heat of the heatable edge that can move in three-dimensional directions (8), said added to the semi-finished product (2) A method according to any one of claims 1 to 6. Wherein said edge for performing variable thickness framework structure (8) is moved to a different depth of the three-dimensional directions, the method of claim 7. While heating to soften the rod-shaped linear semi-finished product (2, 3) along the intersection (4) positioned perpendicular to the production direction (7) as the force is introduced, said connecting straight semifinished products rod type (2,3), the carried out at (4), according to any one of claims 4 8 the method of. The heating of the lattice structure (1) is carried out along a line parallel (5, 6) A method according to any one of claims 1 to 9. Further comprising the step of providing a preformed depression (9) in the semi-finished product (2, 3) in a production direction to be subsequently formed in a three-dimensional direction along the straight line (5, 6) to which heat is applied, the method according to any one of claims 1 10. A process of attaching the cover layer (11) to at least one side of the molded three-dimensional framework structure so that the cover layer (11) is in contact with an end portion of each of the framework structures drawn in the three-dimensional direction. further comprising a method according to any one of claims 1 11. The method according to claim 1, wherein the attachment of the cover layer to the ends on each side of the framework structure is performed by a one-side stitching method (12). Support skeleton structure is produced on the basis of the method according to any one of claims 1 to 13, the supporting framework for the sandwich structure. 14. An aircraft, wherein the core structure includes a sandwich-structured structural component manufactured according to the method of any one of claims 1-13.