CN106891524A - Fluid matrix middle short fiber NW-TFT 3D printing method and device - Google Patents
Fluid matrix middle short fiber NW-TFT 3D printing method and device Download PDFInfo
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- CN106891524A CN106891524A CN201710264424.2A CN201710264424A CN106891524A CN 106891524 A CN106891524 A CN 106891524A CN 201710264424 A CN201710264424 A CN 201710264424A CN 106891524 A CN106891524 A CN 106891524A
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- hopper
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- short fiber
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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
- B33Y10/00—Processes of additive manufacturing
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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
This patent discloses a kind of method and device of NW-TFT chopped fiber in 3D printing technique.The method is, based on powder bed 3D printing technique, chopped fiber to be added in liquid molding material, while changing charging pattern, in stone, the size of scraper speed and direction can change according to design.Fiber during stone in fluid matrix is subject to the shear action of scraper, and the length direction of fiber can be intended to the direction of motion of scraper, that is, realize the long-range order of fiber.Therefore, by designing the motion path of scraper, you can align assembling with realize fiber.The material printed using this method, because the machine direction in material is orientation, can produce the property different from fiber random distribution material.This programmable anisotropic material, is a kind of bionical advanced material, exists in fields such as biomedicine, robot, sensor and electromechanical integration devices and is widely applied potentiality.
Description
Technical field
The invention belongs to rapid shaping and numerical DC speed field, and in particular to one kind makes in 3D printing technique liquid matrix
The method and device of chopped fiber NW-TFT.
Background technology
Biomaterial is typically the composite with micro-structural, and it uses microstructure design, it is possible to achieve many surmounts
The property of artificial material.And fiber is the one of the chief elements that biomaterial builds micro-structural, by fiber geometric parameters
The design of number, distribution character and its material component, forms various material microstructures, so as to realize required material property, such as mantis
Cloth the profit steel construction and sinusoidal structured etc. of dung beetle shrimp.Generally fiber, microbot, thin slice, carbon is added to receive using in printed material at present
Mitron and whisker etc. have the enhancing particulate of certain major diameter (width) ratio, using shearing (friction), magnetic field, sound in print procedure
Field and the mode of electric field induction, make reinforcing material NW-TFT.The 3D printing forming technique for being used includes：Fused glass pellet
(FDM), digital mask photocuring (DLP) and 3D inkjet printings (3DP) etc..
But there is its inherent defect in above induction scheme.Such as, extrusion shear-induced can only be assembled in two-dimensional space, and by
It is to be molded line by line in extrusion printing, there is gap between row and row；The host material viscosity of DLP concussion induction packaging technologies can not
It is too high；The particle of electromagnetically induced assembling needs the functionalization (magnetization), liquid base material viscosity need to keep low viscosity；Sound field is assembled
It is required that fluid matrix viscosity is more low.
Remarkable advantage of the invention is：1. the controllable multiple free degree, realizes the flexible assembling to short fiber material.2.
It is low to fibrous material susceptibility, can be with assemble carbon fibre, glass, metallic fiber and fibres of natural materials；3. for powder, powdering and orientation
Process overlaps, and significantly improves printing effect；4. high viscosity even powder state matrix can be printed.
The content of the invention
Make the method and device of liquid matrix middle short fiber NW-TFT it is an object of the invention to provide a kind of.In traditional powder
On the basis of last bed 3D printing technique, short fiber material is added to be prepared into fiber-enhanced slurry in liquid molding material.The slurry
Material is placed in the rectangle hopper of upper and lower opening, and front and rear wall (side long) bottom section of hopper is V-type, is easy to powdering to orient.Material
Contacted with printing equipment basal plane below case, shaped platform moving up and down is provided with basal plane, when hopper passes through into during stone
During type platform, raw material falls by gravity and is spread on shaped platform by hopper rear wall.In this way, in feed, stone
Simultaneously, you can realize the long-range order of fiber.And the hopper stone direction and speed are adjustable, made with interfibrous friction using it
With fiber alignment can just assembled.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, critical piece of the present invention comprising mainframe 1, digital mask photocuring system 2,
Control system 3, shaped platform 4, hopper 5.Moved along the rail by stepper motor band movable slider, realize that hopper X is moved to Y-direction；
Hopper can be turned about the Z axis by driving stepper motor simultaneously；Digital mask photocuring system 2 is fixed on the top of mainframe 1, position
Directly over shaped platform 4.
Front and rear wall (side long) bottom section of the hopper of the present invention is shaped as V-type, and its both sides and basal plane angle are α and β, α
=30-60 °, β=30-60 °.
Liquid matrix material used of the invention is photosensitive resin, and viscosity range of choice is 300-10000CPS (20 DEG C)；It is short
Fibrous material can use carbon fiber, glass, metallic fiber and natural fiber.Fibre section shape can be round, oval and many
Side shape, diameter range is 5 μm-500 μm, and draw ratio scope is 10-200, fiber and fluid matrix than content be 0wt%-
85wt%.
Stone procedure parameter is notable on directional effect influence in the present invention.Stone procedure parameter includes that feed bin is moved along X, Y-axis
Dynamic velocity and acceleration, the velocity and acceleration for rotating about the z axis and stone thickness.Because scraper geometric parameter, powdering are thick
Degree, powdering speed and acceleration are adjustable, during orientation, can realize optimal state by optimizing above parameter：It is fine
Dimension does not produce translation, realization to rotate in place orientation.Specific implementation process step is as follows：
Step 1：The selection of the composition and hopper of material.
Selection fibrous material and liquid matrix material, determine fiber content；Select suitable hopper front and rear wall (side long) bottom
Portion's cross sectional shape.
Step 2：Physical model is set up with 3D modeling software (such as SolidWorks), stl file is derived to Slice Software,
By the data analysis of the system, generation hopper 5 is moved along X, the movement of Y-axis and the data for rotating about the z axis, shaped platform 4 along Z axis
The pictorial information and time for exposure t of dynamic data, digital mask photocuring system 2.
Step 3：Machine zero is carried out to hopper 5, shaped platform 4, and uniform slurry injection hopper 5 will be pre-mixed
It is interior, i.e., shown in Figure 11.
Step 4：Setting thickness in monolayer, shaped platform declines a thickness, i.e., shown in Figure 12.Drawn in the step 2 of root
Hopper 5 is advanced with certain speed along X, the movement of Y-axis and the data for rotating about the z axis, hopper 5 along specific path, hopper
Rear wall causes chopped fiber to be arranged along specific orientation.
Step 5：According to the pictorial information and time for exposure t of the digital mask photocuring system 2 of step 2 gained, to step 4
Middle monolayer material carries out selective area solidification, and the time for exposure is 5-10S, i.e., shown in Figure 13.
Step 6：After the completion of solidification, shaped platform 4 declines a height for thickness, and it is anti-that hopper 5 presses second layer path data
To stone, i.e., shown in Figure 14.
Step 7:According to the pictorial information and time for exposure t of the digital mask photocuring system 2 of step 2 gained, to step 6
Middle monolayer material carries out selective area solidification, and the time for exposure is 5-10S, i.e., shown in Figure 15.
Step 8：Repeat step 4-7, stacked in multi-layers, i.e., shown in Figure 16.
Step 9：Three-dimensional model is taken out from shaped platform 4, unnecessary photosensitive resin is cleaned using isopropyl acetone solution.Again
Product is put into the solidification post processing of 10min when behavior is entered in UV lamp room.
Benefit of the invention is that：
1. the controllable multiple free degree, realizes the flexible assembling to fibrous material, and the programmable short fiber reinforced of printing is combined
Material；
2., due to the plain mode using mechanical induction, low to fibrous material and host material susceptibility, fiber is without magnetic
The complicated procedures of forming such as change treatment, matrix can be high viscosity even powder state；
3. while feed, stone, the programming to fiber is realized, therefore improve printing effect, reduce energy consumption, led to
It is stronger with property.
Brief description of the drawings
Fig. 1 is mechanism's front view of this patent fluid matrix middle short fiber NW-TFT 3D printing device.Comprising mainframe
1st, (wherein the interior profile region of feed bin 5 is liquid material for digital mask photocuring system 2, control system 3, shaped platform 4, hopper 5
Material).
Fig. 2 is Fig. 1 correspondence top views.
Fig. 3 is I partial enlarged drawing in Fig. 1, and wherein α is scraper anterior angle, and β is scraper relief angle, and arrow represents powdering direction.
Fig. 4 is II partial enlarged drawing in Fig. 1.
Fig. 5 is that all parts freedom of motion of this patent fluid matrix middle short fiber NW-TFT 3D printing device is illustrated
Figure.
Fig. 6 is to make fiber along x to orientation schematic diagram.
Fig. 7 is to make fiber y to orientation schematic diagram.
Fig. 8 orients schematic diagram to make fiber along a certain special angle.
Fig. 9 orients schematic diagram to make fiber along pre-programmed angle.
Figure 10 is this patent fluid matrix middle short fiber NW-TFT 3D printing schematic device.Wherein black box is represented
Cured region, the uncured region of point-like box indicating；
Figure 11, Figure 12, Figure 13, Figure 14, Figure 15 and Figure 16 are this patent fluid matrix middle short fiber NW-TFT 3D printings
Method stone process schematic.
Figure 17 is the mantis of printing shaping in this patent fluid matrix middle short fiber NW-TFT 3D printing device and method
Shrimp pincers portion cloth profit steel construction schematic diagram, comprising 20 layers.
Specific embodiment
Using the carbon fiber of draw ratio l/d=20 in the present embodiment, viscosity is the photosensitive tree of 1000-1050CPS (25 DEG C)
Fat material, cloth profit steel construction (the upper and lower two-layer fibrous septum certain angle of the structure, in the cycle in printing nature squill pincers portion
Property arrangement).
Step 1：The selection of the composition and hopper of material.
Fibrous material：Carbon fiber (draw ratio l/d=20, length l are 0.1mm), cross sectional shape is ellipse.
Host material：Photosensitive resin A (hard phase)：Photosensitive resin B (soft phase)=2:1；Silane coupler：Resin material
=0.5%.
Fiber content：5wt%.
Hopper geometric parameter：The rear angle beta of hopper front and rear wall is 30 degree, and anterior angle α is 90 degree.
According to the above ratio mechanical blending 10min, ultrasonic disperse 2h, then 2h removes bubble in vacuum drying chamber.
Step 2：Physical model is set up with 3D modeling software (such as SolidWorks), stl file is derived to Slice Software,
By the data analysis of the system, generation hopper 5 is moved along X, the movement of Y-axis and the data for rotating about the z axis, shaped platform 4 along Z axis
The pictorial information and time for exposure t of dynamic data, digital mask photocuring system 2.
Step 3：Machine zero is carried out to hopper 5, shaped platform 4, and uniform slurry injection hopper 5 will be pre-mixed
It is interior, i.e., shown in Figure 11.
Step 4：Thickness in monolayer as 0.6mm is set, control system 3 makes shaped platform 4 decline a thickness, i.e. Figure 12 institutes
Show., along X, the movement of Y-axis and the data for rotating about the z axis, hopper is with the speed edge of 10mm/s for the hopper 5 drawn in the step 2 of root
Specific path to advance, hopper rear wall causes fiber to be arranged along specific orientation.
Step 5：According to the pictorial information and time for exposure t of the digital mask photocuring system 2 of step 2 gained, to step 4
Middle monolayer material carries out selective area solidification, and the time for exposure is 5S, i.e., shown in Figure 13.
Step 6：After the completion of solidification, shaped platform 4 declines a height for thickness, and it is anti-that hopper 5 presses second layer path data
To stone, i.e., shown in Figure 14.
Step 7:According to the pictorial information and time for exposure t of the digital mask photocuring system 2 of step 2 gained, to step 6
Middle monolayer material carries out selective area solidification, and the time for exposure is 5S, i.e., shown in Figure 15
Step 8：Repeat step 4-7, stacked in multi-layers, i.e., shown in Figure 16.It is repeated 20 times, obtains the Bu Li that thickness is 12mm
Steel construction, i.e., shown in Figure 17.
Step 9：Three-dimensional model is taken out from shaped platform, unnecessary photosensitive resin is cleaned using isopropanol.Again by product
It is put into the solidification post processing of 10min when behavior is entered in UV lamp room.
Claims (8)
1. a kind of fluid matrix middle short fiber NW-TFT 3D printing method, it is characterised in that：In powder bed 3D printing technique,
Short fiber material is added to be prepared into fiber-enhanced slurry in liquid molding material；Slurry is placed in the rectangle hopper of upper and lower opening
In；Contacted with printing equipment basal plane below hopper；Shaped platform moving up and down is provided with basal plane；When hopper is passed through during stone
During overmolding platform, raw material falls by gravity and is spread on shaped platform by hopper rear wall；The speed of hopper is big during stone
Small and direction is adjustable.
2. method according to claim 1, it is characterised in that hopper speed can be according to default adjustment during stone, can be with
The coordinated movement of various economic factors is done along x and y directions simultaneously, x directions speed and y directions velocity ratio scope are 0.1-20.
3. method according to claim 1, it is characterised in that hopper can rotate about the z axis, and its rotating range is 0-
360 °, and motion can be coupled with X, Y-direction motion about the z axis.
4. method according to claim 1, it is characterised in that liquid base material range of viscosities is 300-10000CPS
(20℃)。
5. method according to claim 1, it is characterised in that the short fiber material volume fraction in liquid base material is
85% is less than more than 0%.
6. method according to claim 1, it is characterised in that the draw ratio scope of chopped fiber is 10-200, diameter range
It it is 5 μm -500 μm, the cross sectional shape of chopped fiber can be circular, oval, kidney shape or polygon.
7. a kind of fluid matrix middle short fiber NW-TFT 3D printing device, it is characterised in that：Covered including mainframe (1), numeral
Film photocuring system (2), control system (3), shaped platform (4) and hopper (5), are transported by stepper motor band movable slider along guide rail
It is dynamic, realize that hopper (5) X is moved to Y-direction；Hopper (5) is turned about the Z axis by driving stepper motor simultaneously；Digital mask photocuring
System (2) is fixed on the top of mainframe (1), directly over shaped platform (4).
8. a kind of fluid matrix middle short fiber NW-TFT 3D printing device according to claim 7, it is characterised in that：Institute
The front and rear wall bottom section of hopper (5) is stated for V-type, its both sides is α with basal plane angle and β, α=and 30-60 °, β=30-60 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710264424.2A CN106891524A (en) | 2017-04-21 | 2017-04-21 | Fluid matrix middle short fiber NW-TFT 3D printing method and device |
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|---|---|---|---|
| CN201710264424.2A CN106891524A (en) | 2017-04-21 | 2017-04-21 | Fluid matrix middle short fiber NW-TFT 3D printing method and device |
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| CN109306142A (en) * | 2018-09-29 | 2019-02-05 | 中南大学 | A kind of new dielectric composite material |
| WO2019038094A1 (en) * | 2017-08-22 | 2019-02-28 | Robert Bosch Gmbh | Method for producing a shaped component, and shaped component produced by means of such a method |
| CN109468550A (en) * | 2019-01-08 | 2019-03-15 | 吉林大学 | A kind of preparation method of 3D printing carbon fiber reinforced aluminum matrix composite |
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Application publication date: 20170627 |