DE102008062678B4 - Composite component with a honeycomb structure - Google Patents

Abstract

Composite component (10) having a core and an upper and a lower cover layer (20, 22), wherein the core of a honeycomb structure (12) or wavy structure (12), which consists of more than two interconnected layers (14), between them the cavities (24) are located, assembled and the cover layers (20, 22) are arranged perpendicular to the edges (16, 18) of the structure (12), characterized in that each layer (14) is made of at least two different materials (26, 28) which are arranged alternately in layers in the structure (12).

Description

The invention relates to a composite component with a core of a honeycomb structure or wave-shaped structure, which is composed of at least two interconnected layers and which has an upper and a lower cover layer, the type specified in the preamble of claim 1 and a method for producing a composite component a core and an upper and a lower cover layer, the specified in claim 9 Art.

In the field of lightweight construction, sandwich structures are increasingly being used. A honeycomb core transmits shear forces and keeps the respective cover layers at a distance. As honeycomb core, for example, so-called paper honeycomb or so-called aramid honeycomb are described. When using paper honeycombs, however, often the required pressure rigidity can not be achieved. The use of aramid honeycombs, however, is often too expensive and is also associated with a low formability of the honeycomb structure.

From the DE 695 32 193 T2 Honeycomb structures are already known. These are highly thermally conductive, non-metallic honeycomb structures having a plurality of interconnected walls defining a plurality of interconnected honeycomb cells. Their longitudinal direction is transverse to the walls and their thickness direction parallel to the walls.

In the DE 697 34 931 T2 For example, a method of forming a layered structure for use as a honeycomb structure will be described. The method provides for providing and advancing at least one web of substrate material to a device which places successive layers of the substrate material in a stacked form.

A structural panel of lightweight construction material is from the DE 10 2004 031 823 A1 known. It has a plurality of contiguous partitions defining a plurality of juxtaposed hollow structural cells extending between the top and bottom of the plate. In this case, in one embodiment, at least two regions are made from mutually different material.

From the DE 10 2004 033 985 A1 a honeycomb body is known, which is flowed through by a fluid. The honeycomb body contains at least one corrugated layer and smooth layer and at least one insert. He is layered, stacked or wrapped. On the insert can be arranged on at least one side of a Welllage and smooth position. The honeycomb body is connected to the insert and fixed in the installation space with the help of the insert.

From the GB 2 203 692 A For example, a laminate composed of a composite is known. This comprises two corrugated plates whose corrugations are perpendicular to each other and to the two-sided panels.

The EP 1 273 731 A2 discloses a composite panel. Between a top and a lower plate arranged parallel thereto, a corrugated intermediate element is arranged.

The object of the present invention is to provide a composite component with a honeycomb or wavy structure, which is composed of at least two interconnected layers, which is inexpensive to produce and which better meets the requirements in the application.

This object is achieved by a composite component with the features of claim 1 and a method for its preparation with the features of claim 9. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the remaining claims.

In order to provide a composite component with a honeycomb structure, which is composed of at least two interconnected layers, which better meets the requirements of the application and is inexpensive to produce, it is provided according to the invention that the at least two layers of the honeycomb structure are formed of different materials , As a result, one has a greater variability with respect to corresponding requirements for specific properties of the composite component.

It is advantageous if at least one layer in the honeycomb structure is wave-shaped. The waveform allows the formation of cavities in the honeycomb structure, whereby a very good compressive stiffness or bending stiffness of the composite component is achieved with less material use.

In one embodiment of the invention, at least one layer in the honeycomb structure is sinusoidal. This leads to an even better spatial rigidity with less material consumption.

It is alternatively also advantageous if at least two layers of the honeycomb structure are arranged together to form a hexagonal shape. The hexagonal shape of the honeycomb structure allows a very good increase in the spatial rigidity with also very good reduction of the wall thickness of the composite component.

Now, if the individual layers of the honeycomb structure arranged on at least one respective splice to each other, in particular glued, the honeycomb structure can be produced in a cost effective and stable manner.

In a further embodiment, the at least two materials of the layers of the honeycomb structure have different mechanical strengths. Thus, it is possible to define locally different mechanical strengths within the composite component or to arrange a mixed form of two or more different mechanical strengths across the entire composite component.

It is advantageous if at least one material of the layers is cellulose paper and another material is aramid paper. Thus, the very good bending stiffness of aramid paper can be combined with the inexpensive cellulose paper in a very good way.

In a further embodiment, at least one material of the layers is treated with a resin. This gives the honeycomb core greater water resistance and flame protection. Alternatively, the honeycomb structure may also be treated with a resin.

The invention also relates to a method for producing a composite component with a honeycomb structure, in which at least two layers of the honeycomb structure are connected to one another, wherein at least two layers of the honeycomb structure made of different materials are joined together. With the help of this method, it is possible to produce stable composite components that are very well adapted to the respective requirements in a cost-effective manner. Advantageously, two materials are first printed with adhesive tape at a defined distance, which stacked at least two materials in an order to be defined, and finally expands the honeycomb structure.

Advantageously, the honeycomb structure is then treated with a resin.

Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawings.

Showing:

1 a schematic cross-section through a composite member having a honeycomb structure, which is composed of a plurality of interconnected layers, wherein at least two layers of the honeycomb structure are formed of different materials;

2 a perspective side view of a honeycomb structure of a composite component, wherein the honeycomb structure is composed of at least two interconnected layers, wherein at least two layers of the honeycomb structure are formed of different materials, wherein 2A Layers formed of different materials are arranged alternately layered in the honeycomb structure, and in 2 B comparing, in comparison with the known prior art, at least two layers stacked in the honeycomb structure are formed from one and the same material;

3 a perspective top view of a composite component having a honeycomb structure, which is composed of at least two interconnected layers, wherein the at least two layers of the honeycomb structure are formed of different materials, wherein at least one layer of the honeycomb structure is formed wavy; and

4 a schematic representation of a method for producing a composite component with a honeycomb structure, in which at least two layers of the honeycomb structure are joined together, wherein at least two layers of the honeycomb structure of different materials are joined together.

In 1 is schematically the honeycomb structure 12 shown. It includes several layers 14 , These layers 14 are connected to each other, which is not shown in the illustrated cross-sectional illustration. At the respective edges 16 . 18 the honeycomb structure 12 is the honeycomb structure 12 each with a cover layer 20 . 22 Mistake. The individual layers 14 are doing the respective cover layers 20 . 22 but they can also be applied in a different way to the respective cover layers 20 . 22 be attached. Between the layers 14 has the honeycomb structure 12 furthermore cavities 24 on. In the present embodiment, the layers 14 made of two different materials 26 . 28 educated. These are made of the materials 26 . 28 formed layers 14 in the honeycomb structure 12 arranged alternately in layers, but theoretically is any other layered arrangement of the layers 14 in the honeycomb structure 12 conceivable. Preferably, in the present embodiment, the honeycomb structure 12 from layers 14 made of the materials 26 . 28 Aramid paper or cellulose paper are formed. As a result, the compressive stiffness is perpendicular to the honeycomb structure 12 increased compared to a pure paper honeycomb, without the cost to be increased too much. The high impact strength and the associated energy absorption of the aramid fibers allows such a honeycomb structure 12 a higher energy absorption under dynamic load compared to a pure paper honeycomb. Maybe the layers can 14 or the entire honeycomb structure 12 be soaked with a resin, leaving the honeycomb structure 12 has a higher water resistance and better flame protection. In principle, it can also be applied to other substances which act in the same or similar manner.

Of course, all other material combinations regarding the choice of materials 26 . 28 or the use of other materials 26 . 28 possible. At this point only glass and carbon should be mentioned as examples. It is crucial that you have materials 26 . 28 which meets the required requirements for respective properties of the honeycomb structure 12 best to do justice.

In 2 are shown in perspective side view two different options A) and B), as those of different materials 26 . 28 formed layers 14 in the honeycomb structure 12 can be organized. In the present embodiment, the layers 14 the honeycomb structure 12 forming a hexagonal shape 30 arranged together. The hexagonal shape 30 the honeycomb structure 12 is created by the layers 14 at defined fixed splices 32 arranged on each other, in particular glued to each other. Of course, the layers can 14 also in a different way at the splices 32 be arranged or attached to each other. It is important that by selecting the splices 32 or the placement points between the different layers 14 cavities 24 between the layers 14 form, which in cross section a hexagonal shape 30 exhibit. This can be saved in a very good way material and thus costs. In addition, this high rigidity and strength at low weight can be achieved. The honeycomb structure 12 can transfer shear forces in a very good way.

In 2A are now made of different materials 26 . 28 formed layers 14 in the honeycomb structure 12 arranged alternately layered. If you now, for example, a material 26 applies, which has a different mechanical strength than the material 28 has, so is the entire honeycomb structure 12 achieved a very good mix of high flexural strength and strength on the one hand and better formability and lower cost on the other hand.

In 2 B however, reflecting the state of the art, there are local areas 34 . 36 inside the honeycomb structure 12 in which several layers stacked on top of each other 14 in the honeycomb structure 12 each of the same material 26 respectively. 28 are formed. In this way it is possible to have locally different requirements on the materials 26 . 28 to react. For example, it is conceivable that locally different forces act on structural components depending on the introduction of force. This can be a locally differentiated stress of the composite component 10 cause. Accordingly, for example, within a range 34 the honeycomb structure 12 through the layered arrangement of layers 14 made of a material 26 are formed, for example, which has a low formability, but has a high flexural strength and strength, achieved in accordance with a locally increased flexural rigidity and strength. In other areas 36 however, z. B. materials 28 used, which have other properties. Of course you can also add other materials 26 . 28 from other materials in the honeycomb structure 12 Install.

In 3 is a honeycomb in perspective view 12 in an alternative form 30 shown. The layers 14 the honeycomb structure 12 again consist of at least two different materials 26 . 28 which are arranged alternately layered together in the present embodiment. The arrangement takes place in turn at defined splices 32 , Here are the respective layers 14 at the splices 32 glued to each other. But they can also be connected to each other in a different way. In this embodiment, the cavities 24 however, no hexagonal shape 30 on. Several layers 14 are in the honeycomb structure 12 wavy, arranged in this embodiment, in particular sine wave. This embodiment has high flexural rigidity and low weight strength due to the presence of voids 24 inside the honeycomb structure 12 As a result, and is therefore well suited to meet the corresponding requirements for sandwich structures, for example in lightweight construction. Again, it is of course conceivable that the respective materials 26 . 28 are arranged such that there are locally changed properties such as different compressive stiffness or even more cost-effective manufacturability within the honeycomb structure 12 comes.

Theoretically, it is both in a honeycomb structure 12 in the hexagonal form 30 , as well as a honeycomb structure 12 in the sinusoidal form 30 possible, the different materials 26 . 28 also within one location 14 to vary. This also saves costs and / or different material properties made available locally.

4 schematically shows the most important steps of a method for producing a composite component 10 with a honeycomb structure 12 with a hexagonal shape 30 as it is for example in 2 is shown. This will be the layers 14 made of respective materials 26 . 28 are formed, first of a roll 38 unrolled. Subsequently, in defined intervals, which are freely selectable, adhesive strips 34 on the individual layers 14 printed. These adhesive strips 34 serve later the arrangement, in particular the bonding of different layers 14 together. In the further process now the at least two materials 26 . 28 stacked in a sequence to be defined. In doing so, they are using the adhesive strips 34 arranged together, in particular glued. As a result, this results in the honeycomb structure 12 with, as shown, a hexagonal shape 30 , which by further stacking of layers 14 can be further expanded. By using at least two different materials 26 . 28 become the previously described locally different properties of the honeycomb structure 12 guaranteed. Following this, the honeycomb structure 12 treated with a resin or other substance with the same or similar properties. However, it is of course also possible that, for example, a material 26 . 28 even before the formation of the honeycomb structure 12 treated with a resin or similar substance.

LIST OF REFERENCE NUMBERS

10

composite component

12

honeycomb structure

14

location

16

edge

18

edge

20

topcoat

22

topcoat

24

cavity

26

material

28

material

30

shape

32

splice

34

Area

36

Area

38

role

Claims (11)

Composite component ( 10 ) with a core and an upper and a lower cover layer ( 20 . 22 ), wherein the core of a honeycomb structure ( 12 ) or wavy structure ( 12 ), which consist of more than two interconnected layers ( 14 ), between which the cavities ( 24 ), and the outer layers ( 20 . 22 ) perpendicular to the edges ( 16 . 18 ) of the structure ( 12 ), characterized in that each layer ( 14 ) each of at least two different materials ( 26 . 28 ) in the structure ( 12 ) are arranged alternately in layers. Composite component ( 10 ) according to claim 1, characterized in that at least one layer ( 14 ) in the honeycomb structure ( 12 ) is formed sinusoidal. Composite component ( 10 ) according to claim 1, characterized in that at least two layers ( 14 ) of the honeycomb structure ( 12 ) to form a hexagonal shape ( 30 ) are arranged together. Composite component ( 10 ) according to one of the preceding claims, characterized in that the individual layers ( 14 ) of the honeycomb structure ( 12 ) at least one respective splice ( 32 ) are arranged together, in particular glued. Composite component ( 10 ) according to one of the preceding claims, characterized in that the at least two materials ( 26 . 28 ) of the layers ( 14 ) in the honeycomb structure ( 12 ) have different mechanical strengths. Composite component ( 10 ) according to one of the preceding claims, characterized in that at least one material ( 26 . 28 ) of the layers ( 14 ) Is cellulose paper and another material ( 26 . 28 ) Aramid paper is. Composite component ( 10 ) according to one of the preceding claims, characterized in that at least one material ( 26 . 28 ) of the layers ( 14 ) is treated with a resin. Composite component ( 10 ) according to one of the preceding claims, characterized in that the honeycomb structure ( 12 ) is treated with a resin. Method for producing a composite component ( 10 ) with a core and an upper and a lower cover layer ( 20 . 22 ), wherein the core of a honeycomb structure ( 12 ) or wavy structure ( 12 ) and the outer layers ( 20 . 22 ) perpendicular to the edges ( 16 . 18 ) of the structure ( 12 ), where more than two layers ( 14 ), so that between the layers ( 14 ) Cavities ( 24 ) of the structure ( 12 ), characterized in that each layer ( 14 ) each of at least two different materials ( 26 . 28 ), which are alternately connected in layers. Method according to claim 9, characterized by Printing the at least two materials ( 26 . 28 ) with adhesive strips at a defined distance, alternately stacking the at least two materials ( 26 . 28 ) in an order to be defined, expansion of the honeycomb structure ( 12 ). Method according to claim 9, characterized in that the honeycomb structure ( 12 ) is treated with a resin.

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