CN110315747A - High strength honeycomb and its 3D printing forming method - Google Patents
High strength honeycomb and its 3D printing forming method Download PDFInfo
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- CN110315747A CN110315747A CN201910681745.1A CN201910681745A CN110315747A CN 110315747 A CN110315747 A CN 110315747A CN 201910681745 A CN201910681745 A CN 201910681745A CN 110315747 A CN110315747 A CN 110315747A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000010146 3D printing Methods 0.000 title claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 204
- 230000001413 cellular effect Effects 0.000 claims abstract description 132
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 18
- 239000011229 interlayer Substances 0.000 claims description 97
- 239000010410 layer Substances 0.000 claims description 74
- 238000007639 printing Methods 0.000 claims description 57
- 238000013461 design Methods 0.000 claims description 27
- 238000000465 moulding Methods 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 abstract description 5
- 239000011162 core material Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000008901 benefit Effects 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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- 230000006641 stabilisation Effects 0.000 description 1
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- 239000012815 thermoplastic material Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- 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
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention provides a kind of high strength honeycomb and its 3D printing forming methods, the honeycomb includes the columnar cellular unit of multiple topological arrangements, the cellular unit is both ends open and inside is empty cavity, and the cellular unit is formed using continuous fiber as main raw material(s) and using 3D printing, the trend of the continuous fiber and the length direction of cellular unit are consistent.The present invention is by preparing honeycomb using 3D printing forming method using continuous fiber as main raw material(s), and the trend that continuous fiber is arranged is consistent with the length direction of columnar cellular unit, so that the direction of continuous fiber is consistent with the direction that mechanics transmits, the major part of honeycomb is used for mechanics transmitting, reduce the material distribution on non-bearing direction, and using the high pressure resistance energy of continuous fiber, the requirement of high-mechanic is realized under limited weight.
Description
Technical field
The present invention relates to 3D field shaping technique, in particular to a kind of high strength honeycomb and its 3D printing molding side
Method.
Background technique
Honeycomb is one of the core material of current composite Materials Design field first choice, have lightweight, high compressive strength, density it is low,
Using it is convenient the advantages that；But with the expansion of composite material application field, the complication of part requirement and further high-strength light
Deng requiring, the shortcomings that honeycomb shows itself, major embodiment in the following areas:
1, cellular uniform in material, be unfavorable for the design requirement of further satisfaction high-strength light: cellular internal structure exists
It is homogeneous on the face x-y, there is no changing according to certain rule, is unable to satisfy carrying demand；
2, cellular compressive strength is low: cellular material is generally the homogeneous materials such as paper, aluminium, by from axial pressure
It is easy conquassation；
3, honeycomb manufacture does not have the characteristics of customization.Honeycomb manufacture is generally using large scale equipment manufacture, multi-step multithread
The molding form of journey, this is unsatisfactory for miniaturization, the design requirement customized and product demand, it would be highly desirable to a kind of novel quick manufacture
Method.
Summary of the invention
Brief summary of the present invention is given below, in order to provide the basic reason about certain aspects of the invention
Solution.It should be appreciated that this summary is not an exhaustive overview of the invention.It is not intended to determine key of the invention
Or pith, nor is it intended to limit the scope of the present invention.Its purpose only provides certain concepts in simplified form, with
This is as the preamble in greater detail discussed later.
It is an object of the present invention to overcome the shortcomings of the prior art and provide a kind of high strength honeycomb and its 3D
Printing shaping method is able to solve technical problem present in above-mentioned honeycomb core material in the prior art.
Technical solution of the invention are as follows:
According to one aspect, a kind of high strength honeycomb is provided, which includes the columnar of multiple topological arrangements
Cellular unit, the cellular unit is both ends open and inside is empty cavity, and the cellular unit is based on continuous fiber
It wants raw material and is formed using 3D printing, the trend of the continuous fiber and the length direction of cellular unit are consistent.
Further, at least three layers of fiber interlayer are also set up in any cellular unit, the fiber interlayer is with continuous
Fiber is main raw material(s) and is formed using 3D printing, wherein two layers of fiber interlayer is separately positioned on cellular unit both ends open
It sentences and closes the opening, residual fiber interlayer is arranged in the internal cavity of cellular unit, and the fiber interlayer hangs down
Directly in the length direction of cellular unit, the shape of the fiber interlayer and the section one perpendicular with cellular unit length direction
It causes, and the continuous fiber of the continuous fiber and at least partly side wall of place cellular unit of the fiber interlayer of any printable layer is formed
The entirety of continuous fiber.
Further, the raw material of the cellular unit and fiber interlayer include staple fiber, in 3D printing forming process,
For arbitrary neighborhood printable layer, the staple fiber filling position is not quite identical.
Further, the fiber interlayer quantity in multiple cellular units is identical or institute at least partly in cellular unit
The fiber interlayer quantity of setting is different.
Further, the fiber interlayer quantity of multiple cellular units is identical, and for any cellular unit,
The position height of its multiple fiber interlayer and the position height of multiple fiber interlayers of other cellular units correspond identical；
Or, the fiber interlayer quantity of multiple cellular units is identical, and at least partly cellular unit, except setting is in honeycomb
The position height of fiber interlayer except two opening of unit and the setting that removes of other cellular units are open in cellular unit two
The position height of fiber interlayer except place is different.
Further, for being located at multiple fiber interlayers of same cellular unit, 2mm- is divided between adjacent fiber interlayer
500mm, preferably 50-200mm；And/or the thickness and the sidewall thickness of cellular unit of the fiber interlayer are 0.2mm-
5mm, preferably 0.6-1mm；And/or with cellular unit length direction the shape in perpendicular section be circle, triangle, rectangle or
Hexagon, the Zhou Changwei 4-100mm in the section, preferably 10-40mm.
A kind of 3D printing forming method of above-mentioned high strength honeycomb is provided according to another aspect, and this method includes
Following steps:
It is the printing layer-by-layer printing shaping of plane with the x-z-plane of honeycomb using continuous fiber as major print raw material
The cellular unit and fiber interlayer of the honeycomb, in which:
X-y-z coordinate system are as follows: using the length direction of cellular unit as z-axis direction, x-axis is perpendicular to z-axis, and y-axis is perpendicular to x-z
Face, and the section vertical with the length direction of cellular unit is located at the face x-y；
The layer-by-layer printing principle design are as follows:
The continuous fiber trend of any printable layer cellular unit side wall is consistent with z-axis direction, and the continuous fibre of fiber interlayer
Dimension trend is located at x-y plane and vertical with the continuous fiber of side wall trend；
And
The printing path of each printable layer designs are as follows: the printing path of arbitrary neighborhood printable layer is inconsistent so that arbitrary neighborhood is beaten
The position for printing the continuous fiber disconnection of layer is not quite identical.
Further, the method also includes: printable layer continuous fiber disconnect position lay down fibre wire rod go forward side by side
Row is cut off to complete the molding of the printable layer.
Further, for corresponding cellular unit in arbitrary neighborhood printable layer, from it in fiber interlayer to the bee
When nest unit sidewall printing or from fiber space printing of the cellular unit side wall into the cellular unit, printing path
Corner direction is not quite identical.
Further, the printing path of any printable layer is designed, with z to fiber continuously for primary selection.
Using above-mentioned technical proposal, a kind of high strength honeycomb and its 3D printing forming method are provided, by with continuous
Fiber is that main raw material(s) uses 3D printing forming method to prepare honeycomb, and the trend of setting continuous fiber and columnar bee
The length direction of nest unit is consistent, so that the direction of continuous fiber is consistent with the direction that mechanics transmits, by the main of honeycomb
Part is transmitted for mechanics, reduces the material distribution on non-bearing direction, and using the high pressure resistance energy of continuous fiber, is being had
The requirement of high-mechanic is realized under the weight of limit；In addition, carrying out the reinforcement of honeycomb using fiber interlayer, no in the method
The laterally attached strength that can only increase between honeycomb side wall maintains cellular original shape, can also improve lateral resistance to compression energy
Power, and since the presence of multiple fiber interlayers gradually transmits lateral pressure, the concentration of strength somewhere is reduced, maintenance bee is conducive to
The form and mechanics transmission path of nest, in addition, quantification manufacture is realized the characteristics of fusion printing technology and advantage, it can
Base is provided in strict accordance with the intensity, fiber orientation and density degree of design requirement design honeycomb each section for the weight reduction of material
Plinth.To sum up, the present invention program expands the manufacturing field and application field of composite material core material, before having engineer application well
Scape.
Detailed description of the invention
Included attached drawing is used to provide to be further understood from the embodiment of the present invention, and which constitute one of specification
Point, for illustrating the embodiment of the present invention, and come together to illustrate the principle of the present invention with verbal description.It should be evident that below
Attached drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying creation
Property labour under the premise of, be also possible to obtain other drawings based on these drawings.
Fig. 1 shows the structural schematic diagram of the high strength honeycomb provided according to an embodiment of the present invention；
Fig. 2 shows the structural schematic diagrams for the high strength honeycomb that another embodiment provides according to the present invention；
Fig. 3 shows the fiber orientation and printing path schematic diagram of the adjacent print layer provided according to embodiments of the present invention；
(a) fiber orientation of a certain printable layer and printing path partial schematic diagram；(b) adjacent with printable layer in (a) to beat
Print the fiber orientation and printing path partial schematic diagram of layer.
Specific embodiment
Specific embodiments of the present invention are described in detail below.In the following description, it is limited for explaining
Property purpose, elaborate detail, with help be apparent from the present invention.It will be apparent however, to one skilled in the art that it is aobvious and
It is clear to, the present invention can also be practiced in the other embodiments departing from these details.
It should be noted that only showing in the accompanying drawings in order to avoid having obscured the present invention because of unnecessary details
Gone out with closely related device structure and/or processing step according to the solution of the present invention, and be omitted with relationship of the present invention not
Big other details.
As shown in Figs. 1-2, a kind of high strength honeycomb is provided according to embodiments of the present invention, which includes multiple
The cellular unit of topological arrangement, the cellular unit is both ends open and inside is empty cavity, and the cellular unit is with even
Continuous fiber is main raw material(s) and is formed using 3D printing, the trend of the continuous fiber and the length direction one of cellular unit
It causes.
In the embodiment of the present invention, for the basic structure form of honeycomb are as follows: the honeycomb list including multiple topological arrangements
Member, the cellular unit is both ends open and inside is empty cavity.And it is equal that current and cellular material is generally paper, aluminium etc.
Material is easy conquassation by from axial pressure, and cellular compressive strength is low, and cellular internal structure is on the face x-y
Homogeneous, it does not change according to certain rule, is unable to satisfy carrying demand.And the embodiment of the present invention is then with continuous fiber
The honeycomb is formed for main raw material(s) and using 3D printing molding mode, and controls the trend and honeycomb of continuous fiber
The length direction of unit is consistent (along the z-axis direction namely continuous fiber along the z-axis direction laying), on the one hand based on continuous fiber from
Body characteristic, overcoming causes by raw material of homogeneous materials such as paper, aluminium by the defect for being easy conquassation from axial pressure, another
Aspect, the trend for controlling continuous fiber is consistent with the length direction of cellular unit, so that the direction of continuous fiber and mechanics transmit
Direction is consistent, improves mechanics bearing capacity.
In the embodiment of the present invention, the continuous fiber material refers to the thermoplastic material containing continuous fiber or contains
The thermosetting material of continuous fiber.
Using a kind of high strength honeycomb provided in an embodiment of the present invention, by being adopted by main raw material(s) of continuous fiber
Honeycomb is prepared with 3D printing forming method, and the trend that continuous fiber is arranged is consistent with the length direction of cellular unit, makes
The direction for obtaining continuous fiber is consistent with the direction that mechanics transmits, and the major part of honeycomb is used for mechanics transmitting, is reduced
Material distribution on non-bearing direction, and using the high pressure resistance energy of continuous fiber, high-mechanic is realized under limited weight
It is required that the embodiment of the present invention expands the manufacturing field and application field of composite material core material, there is future in engineering applications well.
Further, in the present invention, in order to further increase the mechanics bearing capacity of honeycomb, any honeycomb
Also set up at least three layers of fiber interlayer in unit, the fiber interlayer using continuous fiber as main raw material(s) and using 3D printing at
Type, wherein two layers of fiber interlayer is separately positioned on to close the opening at cellular unit both ends open, residual fiber
Interlayer is arranged in the internal cavity of cellular unit, length direction of the fiber interlayer perpendicular to cellular unit, the fiber
The shape of interlayer and consistent with the perpendicular section of cellular unit length direction, and the continuous fibre of the fiber interlayer of any printable layer
Dimension forms the entirety of continuous fiber with the continuous fiber of at least partly side wall of place cellular unit.
In the embodiment of the present invention, the continuous fiber and place cellular unit of the fiber interlayer of any printable layer are at least partly
The entirety that the continuous fiber of side wall forms continuous fiber refers to: in 3D forming process, the printing path of any printable layer can be from
Fiber interlayer directly continuously arrives side wall, so that the fiber interlayer under the printing path and side wall form continuous entirety.
In the embodiment of the present invention, two layers of fiber interlayer is being separately positioned at cellular unit both ends open with by the opening
It carries out closing purpose to be: being closed by both ends open of the fiber interlayer to cellular unit, not only make the stabilization of honeycomb
Property is higher, and makes the bond area of structure bigger.
In the embodiment of the present invention, the shape of setting fiber interlayer and the section one perpendicular with cellular unit length direction
It causing, i.e. size of the size of fiber interlayer i.e. no more than the above-mentioned section of cellular unit can not be less than above-mentioned sectional dimension, if
More than above-mentioned sectional dimension, i.e. the interlayer size that is more than cavity, otherwise layer portions in order to side wall a part；If being less than
Cavity size, printing when, have to the corner of the cutting for increasing fiber and printing path, shape both herein be unanimously for
Guarantee the continuity of fiber and the Compound Degree with unit cavity in a certain printing plane, is conducive to the effective of mechanics in this way
The convenience of transmitting and printing.
Using above-mentioned configuration mode, at least three layers of fiber interlayer are also set up in cellular unit and the design of interlayer is carried out
It limits, the laterally attached strength that can not only increase between honeycomb side wall maintains cellular original shape, can also improve lateral
(honeycomb, can if do not designed using fiber interlayer by more couple of force conjunction states from normal pressure, lateral pressure for anti-pressure ability
Honeycomb can be appeared in the tendency being laterally crushed), further, since the presence of multiple fiber interlayers gradually transmits lateral pressure,
The concentration of strength somewhere is reduced, is conducive to safeguard cellular form and mechanics transmission path, greatly improves the power of honeycomb
Learn performance.
Further, in the present invention, the raw material of the cellular unit and fiber interlayer also include staple fiber, and 3D is beaten
It is printed as during type, for arbitrary neighborhood printable layer, the staple fiber filling position is not quite identical.
In the embodiment of the present invention, the printing plane based on attached drawing 1-3 using continuous fiber it is found that if all printed
Be it is impossible, therefore, when being printed according to the printing path of design, can not use continuous fiber print position
Setting the position that i.e. continuous fiber disconnects uses staple fiber to be filled up to complete the molding of entire printable layer.
In the embodiment of the present invention, when filling up staple fiber, specific operational means can be with are as follows: the place that continuous fiber disconnects
It is filled up with being cut off after wire rod laying.
In the embodiment of the present invention, based on the structure (cellular unit and fiber interlayer) for printing plane in honeycomb, pass through
The staple fiber filling position that adjacent print layer can be realized in design printing path is not quite identical.
Using above-mentioned configuration mode, the raw material that cellular unit and fiber interlayer is arranged also include staple fiber and any phase
Staple fiber filling position described in adjacent printable layer is not quite identical, i.e., so that adjacent two layers continuous fiber breaking part follow it is endless
Complete consistent rule, this avoid somewhere concentrate disconnect so that cause to occur mechanics transmitting is obstructed and generation model deformation or
The problem of damage.
Further, in the present invention, optionally, the fiber interlayer quantity in multiple cellular units is identical or at least
Set fiber interlayer quantity in partial cell unit is different.
Further, in the present invention, optionally, the fiber interlayer quantity of multiple cellular units is identical and right
In any cellular unit, the position of multiple fiber interlayers of the position height and other cellular units of multiple fiber interlayers
Height corresponds identical；Or, the fiber interlayer quantity of multiple cellular units is identical, and at least partly honeycomb
Unit, position height and the removing for other cellular units of the fiber interlayer in addition to two opening of cellular unit is arranged in set
The position height for setting the fiber interlayer except two opening of cellular unit is different.
In the embodiment of the present invention, the present invention prints the characteristics of preparation embodies customization, can be wanted according to specific mechanics
It asks and carries out fiber interlayer height and quantitative setting；In addition the height distribution of fiber interlayer is related with the setting of printing path,
The fiber interlayer height that is staggered is considered if the distribution that continuous fiber disconnects excessively is concentrated.
In the embodiment of the present invention, preferably, setting removes and is arranged in cellular unit two at least partly cellular unit
The position height of fiber interlayer except opening and other cellular units except two opening of cellular unit is set it
The position height of outer fiber interlayer is different.
Using such configuration mode, the position height that the present invention designs each layer of above-mentioned fiber is not both for different mechanics
Transmitting and design, be conducive to load in different height different level in different height setting fiber interlayer and disperse, more conducively
The stability of honeycomb entirety.
Further, for being located at multiple fiber interlayers of same cellular unit, 2mm- is divided between adjacent fiber interlayer
500mm, preferably 50-200mm；And/or the thickness and the sidewall thickness of cellular unit of the fiber interlayer are 0.2mm-
5mm, preferably 0.6-1mm；And/or with cellular unit length direction the shape in perpendicular section be circle, triangle, rectangle or
Hexagon, the Zhou Changwei 4-100mm in the section, preferably 10-40mm.
In the embodiment of the present invention, the shape of preferred cross-sections is hexagon or rectangle, when cross sectional shape is that hexagon makes to guarantee
Stability of the structure on mechanics；Or when cross sectional shape is rectangle, so that more convenient in printing shaping and guarantee in power
Learn the stability of transmitting.
In the embodiment of the present invention, considered based on engineering, the Zhou Changwei 4-100mm in the section, preferably 10-40mm,
In addition, it will be appreciated by those skilled in the art that the adjustment of the range can also be carried out according to actual needs.
In the embodiment of the present invention, based on the level of current 3D printing technique, the thickness of fiber interlayer and the side of cellular unit
Wall thickness is 0.2mm-5mm, preferably 0.6-1mm.
As shown in Figure 1-3, another embodiment provides a kind of 3D printing of above-mentioned high strength honeycomb according to the present invention
Forming method, method includes the following steps:
It is the printing layer-by-layer printing shaping of plane with the x-z-plane of honeycomb using continuous fiber as major print raw material
The cellular unit and fiber interlayer of the honeycomb, in which:
X-y-z coordinate system are as follows: using the length direction of cellular unit as z-axis direction, x-axis is perpendicular to z-axis, and y-axis is perpendicular to x-z
Face, and the section vertical with the length direction of cellular unit is located at the face x-y；
The layer-by-layer printing principle design are as follows:
The continuous fiber trend of any printable layer cellular unit side wall is consistent with z-axis direction, and the continuous fibre of fiber interlayer
Dimension trend is located at x-y plane and vertical with the continuous fiber of side wall trend；
And
The printing path of each printable layer designs are as follows: the printing path of arbitrary neighborhood printable layer is inconsistent so that arbitrary neighborhood is beaten
The position for printing the continuous fiber disconnection of layer is not quite identical.
In the embodiment of the present invention, those skilled in the art are known, and existing Method of printing is using x-y plane in scheming as beating
Plane is printed, if using fiber if raw material, machine direction is also to be sliced layer by layer in x-y plane, printing path and unit shape
Shape is directly related.It is different from existing 3D printing method, the printing path of the embodiment of the present invention is printed in figure x-z-plane, road
One kind is presented like rectangular shape in diameter, is not directly dependent upon with print unit；Cellular unit sidewall fibers trend and z-axis direction one
It causes, the fiber orientation of fiber interlayer is in x-y plane.
In the embodiment of the present invention, repeatedly along designed printing path, the printing of each layer of printable layer can be completed.
A kind of high strength honeycomb and its 3D printing forming method are provided using the embodiment of the present invention, using fiber interlayer
The reinforcement for carrying out honeycomb, the laterally attached strength that can not only increase between honeycomb side wall maintain cellular original shape,
Lateral anti-pressure ability can also be improved, and since the presence of multiple fiber interlayers gradually transmits lateral pressure, reduce strength and exist
The concentration in somewhere is conducive to safeguard cellular form and mechanics transmission path；And the specific successively printing principle of design, so that phase
Adjacent two layers of continuous fiber breaking part follows not quite identical rule, and avoiding somewhere to concentrate to disconnect leads to power occur in turn
Learn transmitting be obstructed and the problem of generation model deformation or damage.In addition, the characteristics of fusion printing technology and advantage, realize
Quantification manufacture, intensity, fiber orientation and the density degree that honeycomb each section can be designed in strict accordance with design requirement are material
Weight, which reduces, provides basis.To sum up, the present invention program expands the manufacturing field and application field of composite material core material, has fine
Ground future in engineering applications.
Further, in the present invention, the printing plane based on attached drawing 1-2 it is found that if all using continuous fiber into
Row printing be it is impossible, therefore, when being printed according to the printing path of design, can not beaten using continuous fiber
The position that the position of print, that is, continuous fiber disconnects uses staple fiber to be filled up to complete the molding of entire printable layer.Namely it is described
Method further include: printable layer continuous fiber disconnect position lay down fibre wire rod and cut off to complete the printable layer
Molding.
Further, in the present invention, in order to further ensure the mechanical property of honeycomb, arbitrary neighborhood is printed
Corresponding cellular unit in layer, from it in fiber interlayer when being printed to the cellular unit side wall or by the cellular unit side
When fiber space printing of the wall into the cellular unit, printing path corner direction is not quite identical.
Using such configuration mode, when designing printing path, for the fiber interlayer and side wall of same cellular unit, by
When fiber interlayer in it is printed to the cellular unit side wall or from the cellular unit side wall into the cellular unit
When fiber space printing, corresponding adjacent two printable layer path is designed as not quite identical, and such mode can further avoid existing
Corner is disconnected or concentrated somewhere concentrating, mechanics transmitting occurs and is obstructed and generation model deformation or damage, and then guarantee honeycomb
The mechanical property of structure.
Further, in the present invention, as shown in figure 3, the printing path for any printable layer designs, with z to fiber
It is continuously primary selection.
In the embodiment of the present invention, for arbitrary neighborhood printable layer, it will appear disconnection or corner overlapping, control disconnects at this time
Or the position of corner overlapping is located on fiber interlayer, i.e., it is continuous that the guarantee upward fiber of z is as much as possible.
Using such configuration mode, designed by printing path, keep z to fiber be continuously primary selection, such design
It can utmostly guarantee the bearing capacity of honeycomb, guarantee the validity that structure z is transmitted to power.
To sum up, the embodiment of the present invention designs a kind of honeycomb that can bear high pressure, the fiber orientation of cellular unit side wall
It is consistent with pressure-bearing direction, and the machine direction of fiber interlayer is mutually perpendicular to pressure-bearing direction in cellular unit, to reach high power
Learn bearing capacity and low macroscopic density；In order to increase the bearing stability of honeycomb core material, fiber is devised in internal structure
Interlayer meets the core material requirement of the high-strength light of space flight and aviation.The advantages of printing technique can be designed, be customized is absorbed simultaneously,
Cellular internal structure and fiber orientation control are formed out by set design requirement, and can be set in strict accordance with design requirement
It counts the intensity, fiber orientation and density degree of honeycomb each section and provides basis for the weight reduction of material.
In order to have more detailed understanding to honeycomb provided by the invention and forming method, below in conjunction with specific embodiment
Present invention is further described in detail, these embodiments should not be understood as limiting scope of the present invention.
Embodiment 1
As shown in Figure 1, the design and shaped form of hexagonal honeycomb
Main material: 12K carbon fiber/thermosetting resin prepreg tape
Cell dimensions: hexagonal cells side length 10mm, wall thickness 2mm, unit size is uniform, uniformly distributed；Block board thickness 2mm,
It is divided into 4 pieces in height, is divided into two layers as 150mm, is divided into 100mm between the last layer.
Path planning:
First layer initial position is located at leftmost side unit, and 1 cellular construction is divided between walking；
Second layer initial position is located at leftmost side unit, and 2 units are divided between walking；
Third layer initial position is located at time left cell, and 1 unit is divided between walking；
4th layer of initial position is located at time left cell, and 2 units are divided between walking；
And so on.
Effect: core material is more than 20MPa with the bonding peel strength of covering, and compression strength can be more than 90MPa, and in side
Incompressible intensity has also exceeded 5MPa, and the stability of core material is also increased while improving material compression strength.Material it is close
For degree for 330 between 200g/cm3, density and compression strength ratio are higher than common paper honeycomb.
Embodiment 2
As shown in Fig. 2, the design and shaped form of rectangle honeycomb core material
Main material: carbon fiber/thermoplastic resin prepreg tape
Cell dimensions: rectangular element side length 10mm, wall thickness 1mm, unit size is uniform, uniformly distributed；Block board thickness 1mm, in height
It is divided into 3 pieces on degree, it is respectively height 200mm, 100mm that interval, which is divided into two sizes, and adjacent cells height is different.
Path planning:
First layer initial position is located at leftmost side unit, and 1 cellular construction is divided between walking；
Second layer initial position is located at leftmost side unit, and 2 units are divided between walking；
Third layer initial position is located at time left cell, and 1 unit is divided between walking；
4th layer of initial position is located at time left cell, and 2 units are divided between walking；
And so on.
Effect: the adhesive strength of core material and covering has been more than 20MPa, density 0.15-0.2g/cm3, and compression strength reaches
More than 40MPa, side impact strength is more than 10MPa.
As above it describes for a kind of embodiment and/or the feature that shows can be in a manner of same or similar at one or more
It is used in a number of other embodiments, and/or combines or substitute the feature in other embodiments with the feature in other embodiments
It uses.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when using herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, one integral piece, step, component or combinations thereof.
The many features and advantage of these embodiments are clear according to the detailed description, therefore appended claims are intended to
Cover all these feature and advantage of these embodiments fallen into its true spirit and range.Further, since this field
Technical staff is readily apparent that many modifications and changes, therefore is not meant to for the embodiment of the present invention to be limited to illustrated and description essence
Really structurally and operationally, but all suitable modifications and the equivalent fallen within the scope of its can be covered.
Unspecified part of the present invention is known to the skilled person technology.
Claims (10)
1. a kind of high strength honeycomb, the honeycomb includes the columnar cellular unit of multiple topological arrangements, the bee
Nest unit is both ends open and inside is empty cavity, which is characterized in that the cellular unit is with continuous fiber for main former material
Expect and formed using 3D printing, the trend of the continuous fiber and the length direction of cellular unit are consistent.
2. a kind of high strength honeycomb according to claim 1, which is characterized in that also set in any cellular unit
At least three layers of fiber interlayer are set, the fiber interlayer is formed using continuous fiber as main raw material(s) and using 3D printing, wherein two
Layer fiber interlayer is separately positioned on to close the opening at cellular unit both ends open, and the setting of residual fiber interlayer exists
In the internal cavity of cellular unit, length direction of the fiber interlayer perpendicular to cellular unit, the shape of the fiber interlayer
It is consistent with the perpendicular section of cellular unit length direction, and the continuous fiber of the fiber interlayer of any printable layer and place bee
The continuous fiber of at least partly side wall of nest unit forms the entirety of continuous fiber.
3. a kind of high strength honeycomb according to claim 2, which is characterized in that the cellular unit and fiber interlayer
Raw material include staple fiber, in 3D printing forming process, for arbitrary neighborhood printable layer, the staple fiber filling position is not
It is completely the same.
4. a kind of high strength honeycomb according to claim 2, which is characterized in that the fibre in multiple cellular units
Tie up that interlayer quantity is identical or set fiber interlayer quantity at least partly in cellular unit is different.
5. a kind of high strength honeycomb according to claim 4, which is characterized in that the fiber of multiple cellular units
Interlayer quantity is identical, and for any cellular unit, the position height and other cellular units of multiple fiber interlayers
Multiple fiber interlayers position height correspond it is identical；Or, the fiber interlayer quantity of multiple cellular units is identical,
And at least partly cellular unit, the position height of the fiber interlayer in addition to two opening of cellular unit is arranged in
It is different from the position height of fiber interlayer in addition to two opening of cellular unit is arranged in of other cellular units.
6. a kind of high strength honeycomb according to claim 2, which is characterized in that for being located at same cellular unit
Multiple fiber interlayers are divided into 2mm-500mm, preferably 50-200mm between adjacent fiber interlayer；And/or the fiber interlayer
The sidewall thickness of thickness and cellular unit is 0.2mm-5mm, preferably 0.6-1mm；And/or it mutually hangs down with cellular unit length direction
The shape in straight section is circle, triangle, rectangle or hexagon, the Zhou Changwei 4-100mm in the section, preferably 10-
40mm。
7. a kind of 3D printing forming method of high strength honeycomb as described in claim 1-6, which is characterized in that the side
Method the following steps are included:
It is described in the printing layer-by-layer printing shaping of plane with the x-z-plane of honeycomb using continuous fiber as major print raw material
The cellular unit and fiber interlayer of honeycomb, in which:
X-y-z coordinate system are as follows: using the length direction of cellular unit as z-axis direction, x-axis perpendicular to z-axis, y-axis perpendicular to the face x-z,
And the section vertical with the length direction of cellular unit is located at the face x-y；
The layer-by-layer printing principle design are as follows:
The continuous fiber trend of any printable layer cellular unit side wall is consistent with z-axis direction, and the continuous fiber of fiber interlayer is walked
To being located at x-y plane and vertical with the continuous fiber of side wall trend；
And
The printing path of each printable layer designs are as follows: the printing path of arbitrary neighborhood printable layer is inconsistent so that arbitrary neighborhood printable layer
Continuous fiber disconnect position it is not quite identical.
8. the method according to the description of claim 7 is characterized in that the method also includes: it is disconnected in the continuous fiber of printable layer
The position lay down fibre wire rod opened simultaneously is cut off to complete the molding of the printable layer.
9. the method according to the description of claim 7 is characterized in that for corresponding cellular unit in arbitrary neighborhood printable layer,
When fiber interlayer in from it is printed to the cellular unit side wall or from the cellular unit side wall into the cellular unit
Fiber space printing when, printing path corner direction is not quite identical.
10. the method according to the description of claim 7 is characterized in that for any printable layer printing path design, with z to
Fiber is continuously primary selection.
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| CN113443900A (en) * | 2021-07-07 | 2021-09-28 | 北京航空航天大学 | Bionic hollow gradient framework structure |
| CN113787717A (en) * | 2021-08-16 | 2021-12-14 | 西安交通大学 | Continuous fiber reinforced composite multi-level lightweight structure, design and manufacturing method |
| CN113858614A (en) * | 2021-09-28 | 2021-12-31 | 大连理工大学 | Continuous fiber multilayer honeycomb sandwich plate and integrated forming method thereof |
| CN115256951A (en) * | 2022-06-28 | 2022-11-01 | 北京航空航天大学宁波创新研究院 | Printing method and system for continuous fiber structure |
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