CN110315747B - High-strength honeycomb structure and 3D printing forming method thereof - Google Patents
High-strength honeycomb structure and 3D printing forming method thereof Download PDFInfo
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- CN110315747B CN110315747B CN201910681745.1A CN201910681745A CN110315747B CN 110315747 B CN110315747 B CN 110315747B CN 201910681745 A CN201910681745 A CN 201910681745A CN 110315747 B CN110315747 B CN 110315747B
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- 238000010146 3D printing Methods 0.000 title claims abstract description 25
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- 239000000463 material Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 239000010410 layer Substances 0.000 claims description 91
- 238000007639 printing Methods 0.000 claims description 86
- 239000011229 interlayer Substances 0.000 claims description 79
- 238000013461 design Methods 0.000 claims description 17
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- 238000009413 insulation Methods 0.000 claims description 10
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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
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/141—Processes of additive manufacturing using only solid materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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Abstract
The invention provides a high-strength honeycomb structure and a 3D printing forming method thereof, wherein the honeycomb structure comprises a plurality of cylindrical honeycomb units which are topologically arranged, the honeycomb units are cavities with openings at two ends and empty interiors, continuous fibers are used as main raw materials of the honeycomb units and are formed by 3D printing, and the direction of the continuous fibers is consistent with the length direction of the honeycomb units. According to the invention, the honeycomb structure is prepared by using the continuous fibers as main raw materials and adopting a 3D printing forming method, and the direction of the continuous fibers is set to be consistent with the length direction of the columnar honeycomb units, so that the direction of the continuous fibers is consistent with the direction of mechanical transmission, the main part of the honeycomb structure is used for the mechanical transmission, the material distribution in the non-bearing direction is reduced, and the requirement of high bearing is realized under the limited weight by utilizing the high pressure resistance of the continuous fibers.
Description
Technical Field
The invention relates to the technical field of 3D (three-dimensional) forming, in particular to a high-strength honeycomb structure and a 3D printing forming method thereof.
Background
The honeycomb is one of the preferred core materials in the field of composite material design at present, and has the advantages of light weight, high compressive strength, low density, convenient application and the like; however, with the expansion of the application field of composite materials, the complication of the requirements of parts, the further requirements of light weight and high strength and the like, the honeycomb presents the disadvantages thereof, which are mainly reflected in the following aspects:
1. the material of honeycomb is even, is unfavorable for further satisfying the design requirement of light weight height: the inner structure of the honeycomb is homogeneous on an x-y surface and does not change according to a certain rule, so that the bearing requirement cannot be met;
2. the honeycomb has low compressive strength: the honeycomb is made of homogeneous materials such as paper, aluminum and the like, and is easy to crush when being pressed from the axial direction;
3. honeycomb manufacture does not have the feature of customization. The honeycomb manufacturing generally uses a form of large-scale equipment manufacturing and multi-step multi-flow molding, which does not meet the design requirements and product requirements of miniaturization and customization, and a novel rapid manufacturing method is urgently needed.
Disclosure of Invention
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
The invention aims to overcome the defects in the prior art, and provides a high-strength honeycomb structure and a 3D printing forming method thereof, which can solve the technical problems of honeycomb core materials in the prior art.
The technical solution of the invention is as follows:
according to one aspect, a high-strength honeycomb structure is provided, and the honeycomb structure comprises a plurality of cylindrical honeycomb units which are topologically arranged, wherein the honeycomb units are cavities with openings at two ends and empty interiors, continuous fibers are used as main raw materials of the honeycomb units and are formed by 3D printing, and the direction of the continuous fibers is consistent with the length direction of the honeycomb units.
Further, at least three fiber interlayers are further arranged in the honeycomb unit randomly, the fiber interlayers use continuous fibers as main raw materials and are formed through 3D printing, the two fiber interlayers are respectively arranged at openings at two ends of the honeycomb unit to seal the openings, the rest fiber interlayers are arranged in an inner cavity of the honeycomb unit, the fiber interlayers are perpendicular to the length direction of the honeycomb unit, the shape of the fiber interlayers is consistent with the cross section perpendicular to the length direction of the honeycomb unit, and the continuous fibers of the fiber interlayers of the randomly printed layers and the continuous fibers of at least part of side walls of the honeycomb unit form a whole of the continuous fibers.
Furthermore, the raw materials of the honeycomb units and the fiber interlayer comprise short fibers, and the filling positions of the short fibers are not completely consistent for any adjacent printing layers in the 3D printing and forming process.
Further, the number of fiber spacers in a plurality of the honeycomb cells is the same or at least the number of fiber spacers arranged in some honeycomb cells is different.
Further, the fiber interlayers of a plurality of the honeycomb units are the same in number, and the position heights of the fiber interlayers of any honeycomb unit are equal to the position heights of the fiber interlayers of other honeycomb units in a uniform and corresponding mode; or the fiber interlayers of a plurality of honeycomb units are the same in number, and the position heights of the fiber interlayers of at least part of the honeycomb units except the fiber interlayers arranged at the two openings of the honeycomb units are different from the position heights of the fiber interlayers of other honeycomb units except the fiber interlayers arranged at the two openings of the honeycomb units.
Further, for a plurality of fiber insulation layers positioned in the same honeycomb unit, the interval between adjacent fiber insulation layers is 2mm-500mm, preferably 50-200 mm; and/or the thickness of the fiber interlayer and the thickness of the side wall of the honeycomb unit are both 0.2mm-5mm, preferably 0.6-1 mm; and/or the shape of a cross section perpendicular to the length direction of the honeycomb unit is a circle, a triangle, a rectangle or a hexagon, and the circumference of the cross section is 4-100mm, preferably 10-40 mm.
According to another aspect, there is provided the above-mentioned 3D printing and forming method for a high-strength honeycomb structure, the method including the steps of:
the method comprises the following steps of taking continuous fibers as main printing raw materials, taking an x-z plane of the honeycomb structure as a printing plane, and printing and forming honeycomb units and fiber interlayers of the honeycomb structure layer by layer, wherein:
the x-y-z coordinate system is: the length direction of the honeycomb units is taken as the z-axis direction, the x-axis is vertical to the z-axis, the y-axis is vertical to the x-z plane, and the cross section vertical to the length direction of the honeycomb units is positioned on the x-y plane;
the layer-by-layer printing principle is designed as follows:
the continuous fiber direction of the side wall of the honeycomb unit of any printing layer is consistent with the direction of the z axis, and the continuous fiber direction of the fiber interlayer is positioned on the x-y plane and is vertical to the continuous fiber direction of the side wall;
and the number of the first and second groups,
the printing path of each printing layer is designed as follows: the print paths of any adjacent printed layer are not uniform such that the positions of continuous fiber breaks of any adjacent printed layer are not exactly uniform.
Further, the method further comprises: laying fiber wires at the position where the continuous fibers of the printing layer are broken and cutting to complete the forming of the printing layer.
Further, for the corresponding honeycomb unit in any adjacent printing layer, when the fiber partition layer in the honeycomb unit prints to the side wall of the honeycomb unit or when the side wall of the honeycomb unit prints to the fiber partition layer in the honeycomb unit, the printing path corner directions are not completely consistent.
Further, for any print layer print path design, z-direction fiber continuity is the primary choice.
By applying the technical scheme, the high-strength honeycomb structure and the 3D printing forming method thereof are provided, the honeycomb structure is prepared by taking continuous fibers as main raw materials and adopting the 3D printing forming method, the direction of the continuous fibers is set to be consistent with the length direction of the columnar honeycomb units, so that the direction of the continuous fibers is consistent with the direction of mechanical transmission, the main part of the honeycomb structure is used for mechanical transmission, the material distribution in the non-bearing direction is reduced, and the high pressure resistance of the continuous fibers is utilized to meet the requirement of high bearing under the limited weight; in addition, in the method, the fiber interlayer is adopted to reinforce the honeycomb structure, so that the lateral connecting force between the side walls of the honeycomb can be increased to maintain the original shape of the honeycomb, the lateral pressure resistance can be improved, the lateral pressure is gradually transmitted due to the existence of the plurality of fiber interlayers, the concentration of the force at a certain position is reduced, the shape and the mechanical transmission path of the honeycomb are favorably maintained, in addition, the characteristics and the advantages of the printing process are fused, the quantitative manufacturing is realized, and the strength, the fiber trend and the density degree of each part of the honeycomb can be strictly designed according to the design requirements, so that a foundation is provided for the weight reduction of the material. In conclusion, the scheme of the invention expands the manufacturing field and the application field of the composite material core material, and has good engineering application prospect.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 illustrates a schematic structural view of a high strength honeycomb structure provided in accordance with an embodiment of the present invention;
FIG. 2 illustrates a schematic structural view of a high strength honeycomb structure provided in accordance with another embodiment of the present invention;
FIG. 3 illustrates a schematic view of fiber orientation and print paths of adjacent print layers provided in accordance with an embodiment of the present invention;
(a) the fiber direction and printing path of a certain printing layer are partially schematic; (b) a schematic of the fiber orientation and print path portions of the print layers adjacent to the print layer in (a).
Detailed Description
The following provides a detailed description of specific embodiments of the present invention. In the following description, for purposes of explanation and not limitation, specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the device structures and/or processing steps that are closely related to the scheme according to the present invention are shown in the drawings, and other details that are not so relevant to the present invention are omitted.
As shown in fig. 1-2, a high-strength honeycomb structure is provided according to an embodiment of the present invention, the honeycomb structure includes a plurality of honeycomb units arranged in a topological structure, the honeycomb units are cavities with two open ends and empty interiors, and the honeycomb units are formed by using continuous fibers as a main raw material and adopting 3D printing, and the continuous fibers have a direction consistent with a length direction of the honeycomb units.
In the embodiment of the present invention, the basic structural form of the honeycomb structure is: the honeycomb unit is a cavity with two open ends and a hollow interior. And at present, the honeycomb material is generally homogeneous materials such as paper, aluminum and the like, the honeycomb material is easy to crush under axial pressure, the compression strength of the honeycomb is low, the internal structure of the honeycomb is homogeneous on an x-y surface and does not change according to a certain rule, and the bearing requirement cannot be met. In the embodiment of the invention, the continuous fibers are used as main raw materials, the 3D printing forming mode is adopted to form the honeycomb structure, the direction of the continuous fibers is controlled to be consistent with the length direction of the honeycomb units (along the z-axis direction, namely the continuous fibers are laid along the z-axis direction), on one hand, the defect that the continuous fibers are easily crushed by pressure from the axial direction due to the fact that homogeneous materials such as paper, aluminum and the like are used as the raw materials is overcome on the basis of the characteristics of the continuous fibers, on the other hand, the direction of the continuous fibers is controlled to be consistent with the length direction of the honeycomb units, so that the direction of the continuous fibers is consistent with the mechanical transmission direction, and the.
In the embodiment of the invention, the continuous fiber material refers to a thermoplastic material containing continuous fibers or a thermosetting material containing continuous fibers.
According to the high-strength honeycomb structure provided by the embodiment of the invention, the honeycomb structure is prepared by taking continuous fibers as main raw materials and adopting a 3D printing forming method, the direction of the continuous fibers is set to be consistent with the length direction of a honeycomb unit, so that the direction of the continuous fibers is consistent with the direction of mechanical transmission, the main part of the honeycomb structure is used for mechanical transmission, the material distribution in the non-bearing direction is reduced, and the requirement of high bearing is met under limited weight by utilizing the high compression resistance of the continuous fibers.
Further, in the invention, in order to further improve the mechanical bearing capacity of the honeycomb structure, at least three fiber interlayers are further arranged in any honeycomb unit, the fiber interlayers are mainly made of continuous fibers and are formed by 3D printing, wherein the two fiber interlayers are respectively arranged at openings at two ends of the honeycomb unit to seal the openings, the rest fiber interlayers are arranged in an inner cavity of the honeycomb unit, the fiber interlayers are vertical to the length direction of the honeycomb unit, the shape of the fiber interlayer is consistent with the cross section vertical to the length direction of the honeycomb unit, and the continuous fibers of the fiber interlayer of any printing layer and the continuous fibers of at least part of side walls of the honeycomb unit form a whole of the continuous fibers.
In the embodiment of the present invention, the fact that the continuous fibers of the fiber partition layer of any printed layer and the continuous fibers of at least part of the side walls of the honeycomb unit form a whole of the continuous fibers means that: in the 3D forming process, the printing path of any printing layer can be directly continuous from the fiber interlayer to the side wall, and then the fiber interlayer and the side wall under the printing path form a continuous whole.
In the embodiment of the invention, the two fiber interlayers are respectively arranged at the openings at the two ends of the honeycomb unit to seal the openings, so that: the openings at the two ends of the honeycomb unit are closed through the fiber interlayer, so that the stability of the honeycomb structure is higher, and the bonding area of the structure is larger.
In the embodiment of the invention, the shape of the fiber interlayer is consistent with the cross section vertical to the length direction of the honeycomb unit, namely the size of the fiber interlayer cannot exceed the size of the cross section of the honeycomb unit or be smaller than the size of the cross section, if the size of the fiber interlayer exceeds the size of the cavity, otherwise, the interlayer part becomes a part of the side wall; if the size of the printing cavity is smaller than the size of the printing cavity, the cutting of the fibers and the corners of the printing path have to be increased during printing, and the consistent shapes of the fibers and the corners are used for ensuring the continuity of the fibers in a certain printing plane and the compounding degree of the fibers and the unit cavities, so that the effective mechanical transmission and the convenience of printing are facilitated.
By applying the configuration mode, at least three fiber interlayers are arranged in the honeycomb unit and the design of the interlayers is limited, so that the lateral connection force between the side walls of the honeycomb can be increased to maintain the original shape of the honeycomb, the lateral pressure resistance capability can be improved (the honeycomb is in a multi-force coupling state from positive pressure and lateral pressure, and if the design of the fiber interlayers is not adopted, the lateral crushing tendency of the honeycomb can be caused).
Further, in the invention, the raw materials of the honeycomb units and the fiber interlayer also comprise short fibers, and the filling positions of the short fibers are not completely consistent for any adjacent printing layers in the 3D printing and forming process.
In the embodiment of the invention, as can be seen from the printing planes shown in fig. 1 to 3, if all the continuous fibers are used for printing, the printing cannot be realized, so that when the printing is carried out according to the designed printing path, short fibers are used for filling the positions where the continuous fibers cannot be used for printing, namely the positions where the continuous fibers are disconnected, so that the forming of the whole printing layer is completed.
In the embodiment of the invention, when filling short fibers, the specific operation means can be as follows: and laying the continuous fibers at the disconnected positions by using wires, cutting and filling.
In the embodiment of the invention, based on the structure (honeycomb units and fiber interlayers) of the printing plane in the honeycomb structure, the incomplete consistency of the filling positions of the short fibers of the adjacent printing layers can be realized by designing the printing path.
By applying the configuration mode, the raw materials for arranging the honeycomb units and the fiber interlayer also comprise short fibers, the filling positions of the short fibers in any adjacent printing layers are not completely consistent, namely, the broken parts of two adjacent layers of continuous fibers follow the rule of incomplete consistency, so that the problem that the model is deformed or damaged due to the fact that mechanical transmission is blocked due to the fact that the continuous fibers are intensively broken at a certain position is solved.
Further, in the present invention, optionally, the number of the fiber spacers in a plurality of the honeycomb units is the same or the number of the fiber spacers arranged in at least some of the honeycomb units is different.
Further, in the present invention, optionally, the number of the fiber spacers of a plurality of the honeycomb units is the same, and for any of the honeycomb units, the position heights of the fiber spacers are the same as the position heights of the fiber spacers of other honeycomb units; or the fiber interlayers of a plurality of honeycomb units are the same in number, and the position heights of the fiber interlayers of at least part of the honeycomb units except the fiber interlayers arranged at the two openings of the honeycomb units are different from the position heights of the fiber interlayers of other honeycomb units except the fiber interlayers arranged at the two openings of the honeycomb units.
In the embodiment of the invention, the printing preparation embodies the customized characteristic, and the height and the number of the fiber interlayer can be set according to the specific mechanical requirements; the height distribution of the fiber spacer layer is related to the setting of the printing path, and if the distribution of the continuous fiber breaks is too concentrated, the height of the fiber spacer layer is considered to be staggered.
In the embodiment of the invention, it is preferable that the height of the fiber spacers, except the fiber spacers arranged at the two openings of the honeycomb unit, of at least part of the honeycomb unit is different from the height of the fiber spacers, except the fiber spacers arranged at the two openings of the honeycomb unit, of other honeycomb units.
By applying the configuration mode, the different position heights of the fiber layers are designed according to different mechanical transmission, and the fiber interlayers are set at different heights, so that the load can be dispersed on different layers with different heights, and the integral stability of the honeycomb structure can be better facilitated.
Further, for a plurality of fiber insulation layers positioned in the same honeycomb unit, the interval between adjacent fiber insulation layers is 2mm-500mm, preferably 50-200 mm; and/or the thickness of the fiber interlayer and the thickness of the side wall of the honeycomb unit are both 0.2mm-5mm, preferably 0.6-1 mm; and/or the shape of a cross section perpendicular to the length direction of the honeycomb unit is a circle, a triangle, a rectangle or a hexagon, and the circumference of the cross section is 4-100mm, preferably 10-40 mm.
In the embodiment of the invention, the shape of the preferred section is hexagonal or rectangular, and when the shape of the section is hexagonal, the stability of the structure on mechanics is ensured; or when the cross section shape is the rectangle for it is more convenient and guarantee at the stability of mechanics transmission when printing the shaping.
In the embodiment of the present invention, the circumference of the cross section is 4-100mm, preferably 10-40mm, based on engineering considerations, and furthermore, it should be understood by those skilled in the art that the range can be adjusted according to actual needs.
In the embodiment of the invention, based on the level of the current 3D printing technology, the thickness of the fiber interlayer and the thickness of the side wall of the honeycomb unit are both 0.2mm-5mm, preferably 0.6-1 mm.
As shown in fig. 1 to 3, according to another embodiment of the present invention, there is provided the above-mentioned 3D printing and forming method for a high strength honeycomb structure, the method including the steps of:
the method comprises the following steps of taking continuous fibers as main printing raw materials, taking an x-z plane of the honeycomb structure as a printing plane, and printing and forming honeycomb units and fiber interlayers of the honeycomb structure layer by layer, wherein:
the x-y-z coordinate system is: the length direction of the honeycomb units is taken as the z-axis direction, the x-axis is vertical to the z-axis, the y-axis is vertical to the x-z plane, and the cross section vertical to the length direction of the honeycomb units is positioned on the x-y plane;
the layer-by-layer printing principle is designed as follows:
the continuous fiber direction of the side wall of the honeycomb unit of any printing layer is consistent with the direction of the z axis, and the continuous fiber direction of the fiber interlayer is positioned on the x-y plane and is vertical to the continuous fiber direction of the side wall;
and the number of the first and second groups,
the printing path of each printing layer is designed as follows: the print paths of any adjacent printed layer are not uniform such that the positions of continuous fiber breaks of any adjacent printed layer are not exactly uniform.
In the embodiments of the present invention, as well known to those skilled in the art, the existing printing method uses the x-y plane in the drawing as the printing plane, if the fiber is used as the raw material, the fiber direction is also in the x-y plane, the layers are sliced layer by layer, and the printing path is directly related to the shape of the unit. Different from the existing 3D printing method, the printing path of the embodiment of the invention is printed on the plane x-z of a graph, the path is in a shape similar to a rectangle and has no direct relation with the printing unit; the fiber running direction of the side wall of the honeycomb unit is consistent with the direction of the z axis, and the fiber running direction of the fiber interlayer is in the x-y plane.
In the embodiment of the invention, the printing of each printing layer can be completed along the designed printing path for multiple times.
The embodiment of the invention provides a high-strength honeycomb structure and a 3D printing forming method thereof, wherein the honeycomb structure is reinforced by adopting fiber interlayers, so that the lateral connecting force between the side walls of the honeycomb can be increased to maintain the original shape of the honeycomb, the lateral pressure resistance can be improved, the lateral pressure is gradually transmitted due to the existence of the fiber interlayers, the concentration of the force at a certain position is reduced, and the maintenance of the shape and the mechanical transmission path of the honeycomb is facilitated; and a specific layer-by-layer printing principle is designed, so that the broken parts of two adjacent layers of continuous fibers follow an incompletely consistent rule, and the problem that the model is deformed or damaged due to mechanical transmission obstruction caused by centralized breaking at a certain position is solved. In addition, the characteristics and the advantages of the printing process are combined, the quantitative manufacturing is realized, and the strength, the fiber trend and the density degree of each part of the honeycomb can be designed strictly according to the design requirements, so that a foundation is provided for the weight reduction of the material. In conclusion, the scheme of the invention expands the manufacturing field and the application field of the composite material core material, and has good engineering application prospect.
Further, in the present invention, as can be seen from the printing plane of fig. 1-2, if printing is not possible by using all the continuous fibers, when printing is performed according to the designed printing path, the printing is performed by filling up the positions where printing is impossible by using the continuous fibers, that is, the positions where the continuous fibers are broken, with short fibers to complete the formation of the entire printing layer. That is, the method further includes: laying fiber wires at the position where the continuous fibers of the printing layer are broken and cutting to complete the forming of the printing layer.
Further, in the present invention, in order to further ensure the mechanical properties of the honeycomb structure, for corresponding honeycomb units in any adjacent printing layer, when printing from the fiber partition layer therein to the side wall of the honeycomb unit or printing from the side wall of the honeycomb unit to the fiber partition layer in the honeycomb unit, the printing path corner directions are not completely consistent.
By applying the configuration mode, when the printing paths are designed, for the fiber interlayer and the side wall of the same honeycomb unit, when the fiber interlayer and the side wall in the same honeycomb unit are printed to the side wall of the honeycomb unit from the fiber interlayer in the same honeycomb unit or when the fiber interlayer in the same honeycomb unit is printed from the side wall of the honeycomb unit to the side wall of the honeycomb unit, the paths of the two corresponding adjacent printing layers are designed to be not completely consistent, and the mode can further avoid that the model is deformed or damaged due to the blocked mechanical transmission at a certain position in the prior art, so that the mechanical property of the honeycomb structure is ensured.
Further, in the present invention, as shown in fig. 3, the z-direction fiber continuity is the primary choice for the print path design of any print layer.
In the embodiment of the invention, the disconnection or corner overlap can occur on any adjacent printing layer, and the position of the disconnection or corner overlap is controlled to be positioned on the fiber interlayer, so that the fibers in the z direction are ensured to be continuous as much as possible.
By applying the configuration mode, the design of printing paths is adopted, the maintenance of the continuity of the z-direction fibers is the primary choice, the design can ensure the bearing capacity of the honeycomb structure to the maximum extent, and the effectiveness of the z-direction force transmission of the structure is ensured.
In summary, the embodiment of the invention designs a honeycomb structure capable of bearing high pressure, the fiber direction of the side wall of the honeycomb unit is consistent with the pressure bearing direction, and the fiber direction of the fiber interlayer in the honeycomb unit is vertical to the pressure bearing direction, so as to achieve high mechanical bearing capacity and low macroscopic density; in order to increase the bearing stability of the honeycomb core material, a fiber interlayer is designed on the internal structure, and the requirements of the light-weight high-strength core material for aerospace are met. Meanwhile, the advantages of designable and customized printing technology are absorbed, the internal structure and the fiber direction of the honeycomb are formed according to the set design requirements, and the strength, the fiber direction and the density degree of each part of the honeycomb can be designed strictly according to the design requirements, so that a foundation is provided for weight reduction of materials.
For a more detailed understanding of the honeycomb structure and the method of forming provided by the present invention, the present invention is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.
Example 1
The design and formation of hexagonal honeycomb, as shown in FIG. 1
The main materials are as follows: 12K carbon fiber/thermosetting resin prepreg tape
Honeycomb size: the side length of the hexagonal unit is 10mm, the wall thickness is 2mm, and the unit size is uniform and evenly distributed; the partition boards are 2mm in thickness, are divided into 4 blocks in height, are 150mm in the upper two layers and are 100mm in the last layer.
Path planning:
the first layer of starting position is positioned at the leftmost unit, and the walking interval is 1 unit structure;
the starting position of the second layer is positioned at the leftmost unit, and the walking interval is 2 units;
the starting position of the third layer is positioned at the secondary left unit, and the walking interval is 1 unit;
the starting position of the fourth layer is positioned at the secondary left unit, and the walking interval is 2 units;
so as to reciprocate.
The effect is as follows: the bonding peel strength of the core material and the skin exceeds 20MPa, the compressive strength can exceed 90MPa, the compressive strength on the side surface also exceeds 5MPa, and the stability of the core material is improved while the compressive strength of the material is improved. The density of the material is 330-200 g/cm3, and the ratio of the density to the compressive strength is higher than that of the common paper honeycomb.
Example 2
As shown in FIG. 2, the design and molding form of the rectangular honeycomb core material
The main materials are as follows: carbon fiber/thermoplastic resin prepreg tape
Honeycomb size: the side length of each rectangular unit is 10mm, the wall thickness is 1mm, and the units are uniform in size and are uniformly distributed; the partition plate is 1mm in thickness, is divided into 3 blocks in height, is divided into two sizes at intervals, is respectively 200mm and 100mm in height, and adjacent units are different in height.
Path planning:
the first layer of starting position is positioned at the leftmost unit, and the walking interval is 1 unit structure;
the starting position of the second layer is positioned at the leftmost unit, and the walking interval is 2 units;
the starting position of the third layer is positioned at the secondary left unit, and the walking interval is 1 unit;
the starting position of the fourth layer is positioned at the secondary left unit, and the walking interval is 2 units;
so as to reciprocate.
The effect is as follows: the bonding strength of the core material and the skin is more than 20MPa, the density is 0.15-0.2g/cm3, the compressive strength reaches more than 40MPa, and the lateral impact strength exceeds 10 MPa.
Features that are described and/or illustrated above with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
The many features and advantages of these embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of these embodiments which fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.
The invention has not been described in detail and is in part known to those of skill in the art.
Claims (10)
1. A high-strength honeycomb structure comprises a plurality of cylindrical honeycomb units which are arranged in a topological mode, wherein the honeycomb units are cavities with openings at two ends and empty interiors, and the honeycomb structure is characterized in that continuous fibers are used as main raw materials and are formed by 3D printing, and the direction of the continuous fibers is consistent with the length direction of the honeycomb units;
arbitrary still set up at least three-layer fiber interlayer in the honeycomb unit, the fiber interlayer uses continuous fibers as main raw and other materials and adopts 3D to print the shaping, and wherein, two-layer fiber interlayer sets up respectively in honeycomb unit both ends opening department with the opening seals, and remaining fiber interlayer sets up in the internal cavity of honeycomb unit, the length direction of fiber interlayer perpendicular to honeycomb unit, the shape of fiber interlayer is unanimous with honeycomb unit length direction looks vertically cross-section, and prints the continuous fibers of the fiber interlayer on layer wantonly and the continuous fibers of the at least partial lateral wall of honeycomb unit at place and form continuous fibers's whole wantonly.
2. A high strength honeycomb structure according to claim 1 wherein the raw material of the honeycomb cells and fibrous insulation layers comprises short fibers, and the filling positions of the short fibers are not completely consistent for any adjacent printed layer during 3D printing.
3. A high strength honeycomb structure according to claim 1 or 2 wherein the number of fibrous insulation layers in a plurality of said honeycomb cells is the same or at least some of the honeycomb cells are different.
4. A high strength honeycomb structure according to claim 3 wherein the number of fiber spacers of a plurality of said honeycomb cells is the same, and the height of the plurality of fiber spacers of any of said honeycomb cells is the same as the height of the plurality of fiber spacers of other honeycomb cells; or the fiber interlayers of a plurality of honeycomb units are the same in number, and the position heights of the fiber interlayers of at least part of the honeycomb units except the fiber interlayers arranged at the two openings of the honeycomb units are different from the position heights of the fiber interlayers of other honeycomb units except the fiber interlayers arranged at the two openings of the honeycomb units.
5. A high strength honeycomb structure according to claim 2 wherein for a plurality of fibrous insulation layers located in the same honeycomb cell, the spacing between adjacent fibrous insulation layers is 2mm to 500 mm; and/or the thickness of the fiber interlayer and the thickness of the side wall of the honeycomb unit are both 0.2mm-5 mm; and/or the shape of the cross section perpendicular to the length direction of the honeycomb unit is circular, triangular, rectangular or hexagonal, and the circumference of the cross section is 4-100 mm.
6. A high strength honeycomb structure according to claim 5 wherein for a plurality of fibrous insulation layers located in the same honeycomb cell, the spacing between adjacent fibrous insulation layers is 50-200 mm; and/or the thickness of the fiber interlayer and the thickness of the side wall of the honeycomb unit are both 0.6-1 mm; the perimeter of the cross section is 10-40 mm.
7. The 3D printing forming method of the high-strength honeycomb structure according to any one of claims 1 to 6, wherein the method comprises the following steps:
the method comprises the following steps of taking continuous fibers as main printing raw materials, taking an x-z plane of the honeycomb structure as a printing plane, and printing and forming honeycomb units and fiber interlayers of the honeycomb structure layer by layer, wherein:
the x-y-z coordinate system is: the length direction of the honeycomb units is taken as the z-axis direction, the x-axis is vertical to the z-axis, the y-axis is vertical to the x-z plane, and the cross section vertical to the length direction of the honeycomb units is positioned on the x-y plane;
the layer-by-layer printing principle is designed as follows:
the continuous fiber direction of the side wall of the honeycomb unit of any printing layer is consistent with the direction of the z axis, and the continuous fiber direction of the fiber interlayer is positioned on the x-y plane and is vertical to the continuous fiber direction of the side wall;
and the number of the first and second groups,
the printing path of each printing layer is designed as follows: the print paths of any adjacent printed layer are not uniform such that the positions of continuous fiber breaks of any adjacent printed layer are not exactly uniform.
8. The method of claim 7, further comprising: laying fiber wires at the position where the continuous fibers of the printing layer are broken and cutting to complete the forming of the printing layer.
9. The method of claim 7, wherein for corresponding cells in any adjacent printed layer, the direction of the printed path corner is not exactly the same when printing from the fibrous barrier layer therein to the cell sidewall or when printing from the cell sidewall to the fibrous barrier layer therein.
10. The method of claim 7, wherein z-direction fiber continuity is the primary choice for print path design for any print layer.
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| CN113443900B (en) * | 2021-07-07 | 2022-05-31 | 北京航空航天大学 | Bionic hollow gradient framework structure |
| CN113787717B (en) * | 2021-08-16 | 2022-12-09 | 西安交通大学 | Continuous fiber reinforced composite multi-level light structure, design and manufacturing method |
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| CN106863772A (en) * | 2017-02-27 | 2017-06-20 | 上海大学 | Double shower nozzle 3D printing system and method for thermoplastic resin base continuous fibers prepreg |
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| DE102017214340A1 (en) * | 2017-08-17 | 2019-02-21 | Airbus Operations Gmbh | Process for producing a sandwich component, core for a sandwich component and sandwich component |
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