CN106426915A - High-speed continuous photocuring type 3D printing device and working method thereof - Google Patents
High-speed continuous photocuring type 3D printing device and working method thereof Download PDFInfo
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- CN106426915A CN106426915A CN201610945088.3A CN201610945088A CN106426915A CN 106426915 A CN106426915 A CN 106426915A CN 201610945088 A CN201610945088 A CN 201610945088A CN 106426915 A CN106426915 A CN 106426915A
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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 discloses a high-speed continuous photocuring type 3D printing device and a working method thereof. The 3D printing device comprises a machine case body which is divided into an upper cavity and a lower cavity by a middle partition board, wherein an image forming module is arranged in the lower cavity, a window box and an oxygen supply cooling module are arranged in the upper cavity and are combined to be fixedly mounted on the middle partition board, the oxygen supply cooling module is arranged right below the window box, and the image forming module I is arranged right below the window box; a printing platform is arranged right above the window box and is mounted on a Z-direction worktable; and the window box is connected with a raw material feeding unit. The 3D printing device is integrated with the advantages of a compound oxygen-rich film, oxygen supply cooling and liquid surface auxiliary pressurization of the window box, so that the low-cost and efficient continuous printing of large-sized products with arbitrary shapes is realized, the range of applicable materials is wide, the printed products are high in precision and quality and good in uniformity, and the process is stable and reliable. An industrial-grade solution is provided for the high-speed continuous photocuring type 3D printing.
Description
Technical field
The present invention relates to increasing material manufacturing and 3D printing technique field are and in particular to a kind of high-speed and continuous photocuring 3D printing fills
Put and its method of work.
Background technology
Optical soliton interaction is to develop a kind of earliest, the most ripe at this stage, most widely used increasing material manufacturing (3D printing) skill
Art, through the development of nearly 30 years, from initial stereolithography apparatus (Stereolithography, SL), develops perhaps
How new technique, such as micro- stereolithography (Microstereolithography), integral microstereolithography technology
(Integral SL, Projection Microstereolithography), digital light process (Digital Light
Processing, DLP) 3D printing, continuous liquid level growth (Continuous Liquid Interface Production,
CLIP), two-photon polymerized laser direct-writing 3D printing etc..
Traditional stereolithography apparatus are using laser galvanometer or mask technical controlling light area, so that resin is existed
Successively solidify in controlled light area, generate three-dimensional entity model after successively solidifying superposition.But this point by point scanning light
Curing mode has following deficiency：Low (about 8～the 12x10 of forming efficiency4mm3/h)；There is larger contraction, workpiece produces during solidification
Raw buckling deformation.Tend to the optical soliton interaction under ripe background, shaping based on surface layer in the development of point by point scanning photocuring technology
Technology is arisen at the historic moment, and the face of main flow shapes photocuring technology mainly to be had：Process the face battle array exposure curing skill of (DLP) based on digital light
Art and continuous number light process 3D printing (continuous photocuring 3D printing).Continuous photocuring 3D printing is that the one kind in recent years occurring is non-
Often important increasing material manufacturing new technology, especially continuous liquid level growth CLIP technology is to be opened by Carbon3D company of the U.S. for 2015
A kind of subversive 3D printing new technology sent out, the general principle of CLIP：Using the effect of oxygen inhibition, oxygen pass through window with
The contact of resin bottom liquid level, formed one layer thin can not be and purple by the region of ultra-violet curing, referred to as " dead band " (Dead Zone)
Outside line still can be transmitted through dead band, up continues to produce polymerization, avoid resin and the bottom window of solidification simultaneously
The adhesion of mouth.Ultraviolet Continuous irradiation resin, print platform is also continuous rising, realizes continuous printing.CLIP technology is solid by light
Change print procedure and print from lamination and be changed into continuously printing, this uniqueness bringing three aspects and significant advantage：(1) efficient, than
Confidential fast 25-100 times of traditional 3D printing, is improved 1000 times of potentiality in theory；(2) high-precision, in high precision with high surface
Quality, it is to avoid the step effect of traditional 3D printing, can be infinitely fine and smooth on lift height, realizes no layering and prints；(3) high property
Can, because layer structure, its mechanical characteristic is different in all directions, particularly in the direction of stacking for traditional 3D printing part
On, anti-shear performance is very poor, and the mechanical characteristic of parts that CLIP prints is consistent in all directions, improve performance and
Expand range of application.
3D printing equipment based on CLIP is to hold liquid photosensitive resin from traditional the different of uv equipment maximum
Print window (reservoir).Traditional face exposure 3D printer is the bottom holding resin device to coat the high transparent glass of mould release membrance
Portion's window, and employ in CLIP technology have oxygen flow and saturating ultraviolet light performance Teflon material (Teflon AF) be bottom
Portion's window.Oxygen passes through window and immerses liquid photosensitive resin, and due to the presence of oxygen inhibition, window surface can form certain thickness
The not consolidation zone of degree (tens microns), so that resin solidification occurs on print window, printing part will not be with bottom land
Window adhesion, thus realize high-speed and continuous print.But CLIP technique faces some shortcomings and limitation：
(1) oxygen flow being used and the price of saturating ultraviolet light Teflon material are very expensive, and need special manufacture
Technique.
(2) when photosensitive resin crosslinks curing reaction, substantial amounts of heat can be discharged, lead to beam irradiation area temperature liter
Height, after long-time irradiation, easily because crossing heat ageing, its transparency reduces the Teflon material of oxygen and saturating ultraviolet light, impact
Light efficiency and drip molding quality.
(3) a large amount of thermals source of discharging of CLIP high-speed and continuous solidification, currently existing scheme also cannot timely and effectively discharge and
Discharge these heat, thus the current Forming Workpiece of CLIP technique is limited at less size objects and prints (small size part generation
Heat relatively fewer, it is relatively easy that release is discharged in heat exchange).
(4) for the flying print of photosensitive resin, when separating rate reaches a certain amount of, maximum restriction is exactly resin
Back-flow velocity, it is more difficult to process especially when the ratio of viscosities of resin is higher.
Therefore, for the printing of large sized object, the technique such as CLIP is also faced with realizing bottom dead liquid level and solidification
Liquid level consumes a quick supply difficult problem for resin material.Therefore, existing continuous ultraviolet curing process (as CLIP) be only applicable to little
The printing of size objects, the typical part shape of printing is also limited to some engraved structures mostly it is difficult to realize large scale and reality
The efficient system of body part；And the raising further of print speed and quality is restricted.In the urgent need to develop new technique and
Technology.
Content of the invention
The purpose of the present invention is exactly to solve the above problems, provide a kind of high-speed and continuous photocuring 3D printing device and its
Method of work, it adopts a kind of new print window, and combines the compound oxygen permeable membrane of window box, oxygen supply refrigerating module, liquid level
The advantage of additional pressure applicator module three, realizes accurate effective control (dead band oxygen content, dead band and solidification liquid level to dead band oxygen content
Rapid recharge, solidification process discharges the quick discharge of heat), realize to large scale, arbitrary shape drip molding low cost, efficiently connect
Continuous printing.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of high-speed and continuous photocuring 3D printing device, including：Machine case body, described machine case body is divided into by central dividing plate
Upper chamber and lower chambers；Described lower chambers are provided with image-forming module, and described upper chamber is provided with window box and oxygen supply refrigerating module, described
Window box and the combination of oxygen supply refrigerating module are fixedly mounted on central dividing plate, and described oxygen supply refrigerating module is arranged on described window box
Underface, described image-forming module is arranged on the underface of described window box；It is provided with print platform, institute directly over described window box
State print platform to be arranged on Z-direction workbench；Described window box is connected with raw material feed unit；
Described oxygen supply refrigerating module, including oxygen supply cooling chamber, the two ends of described oxygen supply cooling chamber respectively with cooling air inlet pipe
Road and cooling outlet pipe connect, and described cooling air inlet pipeline is connected with oxygen supply cooling unit；Oxygen supply cooling chamber is arranged on window
The underface of box print window, and form closed chamber with print window；
During printing, pass through to control the oxygen content in window cassette bottom portion resin dead band by oxygen supply refrigerating module and will continuously print
During release heat eject raising print speed in time.
A kind of high-speed and continuous photocuring 3D printing device, also includes：Liquid level additional pressure applicator module, described liquid level additional pressure applicator
Module includes the oilless air compressor being arranged in lower chambers, and described oilless air compressor is connected with the entrance of charged air induction pipeline, institute
The outlet stating charged air induction pipeline is arranged in upper chamber, and described upper chamber has air-tightness.By resin liquid level additional pressure applicator
Module increases the gas pressure intensity of upper chamber, and during printing, gases at high pressure press to photosensitive resin liquid level, accelerates photosensitive resin to window
Cassette bottom portion resin dead band and the flowing of consolidation zone, realize resin quick backflow and supply.
Described window box adopts separate structure, including：Reservoir, seal washer, compound oxygen permeable membrane and pressing plate；Described confession
Through hole, oxygen supply cooling chamber, pressing plate and reservoir is all had on oxygen cooling chamber, pressing plate, compound oxygen permeable membrane, seal washer and reservoir
Hole be screwed hole, the side of oxygen supply cooling chamber is provided with boss, and the side of pressing plate has corresponding recessed with oxygen supply cooling chamber convex platform
Groove；The boss of described oxygen supply cooling chamber and the groove clamping of pressing plate, and be bolted connection.Described pressing plate is led to reservoir
Cross bolt connection compression, described pressing plate and reservoir accompany compound oxygen permeable membrane and seal washer between the two, and seal washer
It is located above compound oxygen permeable membrane.Oxygen supply cooling chamber bottom is provided with suprasil plate, and the area of suprasil plate is more than imaging area.
Described reservoir is used for holding liquid photosensitive resin, and described seal washer is used for preventing storage liquid photosensitive resin from letting out
Leakage, described pressing plate is used for fixing reservoir with compound oxygen permeable membrane.
The print window of window box is included using compound oxygen permeable membrane, compound oxygen permeable membrane：Porous support layer and oxygen-rich layer composition,
Porous support layer is located at the lower section of oxygen-rich layer.
Described porous support layer is the film with finger-like or spongy pore structure, and the material of selection includes polytetrafluoroethylene (PTFE)
PTFE, Kynoar PVDF, polyacrylonitrile (PAN), polysulfones PS, polycarbonate, polyethylene terephtalate or poly-
Etherimide PEI, the aperture 50nm-2000nm of porous support layer, porosity 60%-90%, the thickness range of porous support layer
For 10-1000 micron.
Described oxygen-rich layer is the dense film with high oxygen transmission coefficient, and the material of selection includes dimethyl silicone polymer
PDMS, perfluoroethylene-propylene FEP or poly- trimethyl silicane -1- propine PTMSP, the thickness range of oxygen-rich layer is 1-100 micron.
Compound oxygen permeable membrane has oxygen flow and the characteristic of saturating ultraviolet light, and oxygen transmission coefficient is in more than 10barrer, 365-
405nm uv transmittance is not less than 80%.And there is excellent mechanical performance.
Described print window area is more than imaging area.
Described print platform area is less than print window, and described print platform area is equal to or more than imaging area.Print
Platform be located at window box directly over, and with print window keeping parallelism.
The base plate of described oxygen supply cooling chamber adopts transparency silica glass, and 365-405nm uv transmittance is not less than 90%,
Base areas are more than imaging area.
Described image-forming module includes：Ultraviolet LED lamp, described ultraviolet LED lamp is connected with dynamic mask signal generating unit.
Described ultraviolet LED lamp is ultraviolet LED module, and intensity of illumination is adjustable, and is furnished with heat sink and fan is radiated.Purple
The power bracket of outer LED is 10-200W, wave-length coverage 365-405nm, and the light that it sends is irradiated to dynamic after beam path alignment
In state mask signal generating unit.
Described dynamic mask signal generating unit adopts DMD DMD, liquid crystal display LCD or spatial light modulator
SLM.Dissimilar dynamic mask signal generating unit needs to configure corresponding beam path alignment, and the effect of collimated light path is to produce
Ultraviolet light being irradiated in dynamic mask signal generating unit according to required even angle；Dynamic mask signal generating unit is located at print window
Lower section, generates image upright projection on the print window of window box.
Described print platform is fixed on Z-direction workbench by connecting bracket；Z-direction workbench is fixed in cabinet upper chamber
In back plate.
Z-direction workbench is high-accuracy displacement work table, including：Electric precise translation stage, high accuracy straight line slide unit or piezoelectricity
Displacement platform.
Translational speed scope in print procedure for the described Z-direction workbench is 10mm/h-1000mm/h, in non-print process
In moving range be 100mm/min-1000mm/min.
Described raw material feed unit includes：Raw material material storage tube, feed connecting tube and measuring pump.Described raw material material storage tube
It is connected with window box by feed connecting tube, described measuring pump is connected with raw material material storage tube and feed connecting tube respectively.Former material
Material material storage tube is arranged on lower chambers with measuring pump.
Described lower chambers are provided with thermal window.
A kind of method of work of high-speed and continuous photocuring 3D printing device, comprises the steps：
Step (1)：Print initial setting up, pretreatment：Open raw material feed unit, to the reservoir injection liquid in window box
State photosensitive resin；Z-direction workbench drives print platform to be moved downwardly to initialization position, and print platform is immersed in liquid photosensitive
Resin, and print platform keeps setpoint distance with the compound oxygen permeable membrane in window box；Open oxygen supply cooling unit and oil-free pneumatics
Machine；
Step (2)：Continuous printing-forming part：Z-direction workbench is continuously broadcast with setting speed continuance lifting, simultaneously image-forming module
Put layer images information；The ultraviolet selective that ultraviolet LED lamp produces is irradiated on liquid photosensitive resin, and print platform is continuous
By the resin pull-up of solidification, window cassette bottom portion resin dead band endlessly supplements liquid photosensitive resin needed for solidification upwards, makes
Obtain print procedure serialization；
Step (3)：Post processing：After completing part printing, close image-forming module, oxygen supply cooling unit and oilless air compressor.Z
Drive print platform to workbench and print part return in situ；Take off print platform and print part；Finally, part will be printed
Take off from print platform.
The print platform of described step (1) keeps setpoint distance for 10-50 micron with the compound oxygen permeable membrane in window box.
In the continuous print procedure of described step (2), oxygen supply cooling unit and oilless air compressor are constantly in opening, and
And raw material feed unit is continuously replenished interpolation liquid photosensitive resin to reservoir.
In the continuous print procedure of described step (2), oxygen supply refrigerating module works, oxygen supply cooling unit by cooling air or
The cooled air inlet pipeline of cryogenic oxygen setting concentration is transported to the envelope of oxygen supply cooling chamber and the compound oxygen permeable membrane composition of window box
Close in space, endlessly supplement the oxygen that solidification consumes, and photosensitive resin crosslinking curing is produced by cooled outlet pipe
Heat discharge in time, realize the accuracy controlling to dead band oxygen content for compound oxygen permeable membrane supplemental oxygen, take away solidification simultaneously and produce
Raw heat, the temperature keeping dead band to set, prevent the aging of compound oxygen permeable membrane.
Described step (2) makes upper chamber's gas boosting by liquid level additional pressure applicator module, and gases at high pressure force resin to dead
Flow in area, accelerate the supplementary speed of resin needed for solidification；
When large-size components print, solidification center away from deadband boundaries entrance farther out, acts in the pressure of gases at high pressure
Under, resin quickly to the flowing of solidification center, is realized resin and is supplemented in time, realize large-area continuous printing.
Described step (2) is by compound oxygen permeable membrane and oxygen supply refrigerating module collective effect, the oxygen content in control accurate dead band
Thickness with dead band.
Beneficial effects of the present invention：
Present invention comprehensive utilization compound oxygen permeable membrane, oxygen supply refrigerating module, the collective effect of liquid level additional pressure applicator module three,
Realize large scale, the low cost of arbitrary shape part, high-efficiency and continuous printing.
(1) large scale, the printing of arbitrary shaped body/part are achieved.By introducing compound oxygen permeable membrane, oxygen supply cools down mould
Block, liquid level additional pressure applicator module, realize to the accuracy controlling printing dead band oxygen content and dead band thickness, effectively solving large scale structure
Dead band and consolidation zone in the quick discharge of heat and release, and large-scale part manufacture process is discharged in part print procedure
A difficult problem for large area resin quick backflow supply.
(2) low production cost.Using a kind of compound oxygen permeable membrane of low cost, reduce manufacturing cost.Improve continuous light solid
The performance of metallization processes, and being capable of the oxygen content in control accurate dead band and the thickness in dead band.
(3) pass through liquid level additional pressure applicator module, improve resin back-flow velocity in continuous print procedure, realize dead band and consolidate
Change the resin rapid recharge of liquid level, improve print speed；By liquid level additional pressure applicator module, improve large-scale part and produced
Resin back-flow velocity in journey, effectively solves dead band and consolidation zone large area resin in large-scale part manufacture process and quickly returns
A stream difficult problem, it is achieved that the high-speed and continuous of arbitrary shape large sized object print, breaches the existing continuous photocuring 3D such as CLIP and beats
It is imprinted on forming dimension, shape, efficiency, precision and the restriction becoming present aspect.
(4) pass through oxygen supply refrigerating module, the big calorimetric producing release in continuous print procedure is discharged in time, improve continuous
Print speed；By compound oxygen permeable membrane and oxygen supply refrigerating module for the accuracy controlling of dead band oxygen content, improve print speed.
By oxygen supply refrigerating module, the oxygen content in one side control accurate dead band, improve productivity ratio, expansion technique range (can use
Printed material)；On the other hand, the heat that photosensitive resin material crosslinking curing discharges quickly can be excluded, improve and print
Efficiency, extends compound oxygen permeable membrane service life simultaneously, and (the continuous light such as existing CLIP is solid to be especially increased the size of printout
Metallization processes, the heat producing in Light Curing can not effectively and timely be excluded, and constrain productivity ratio, have impact on the precision of product,
Print particular without realizing large-scale part).
(5) printing precision is high, it is to avoid the defect such as thermal stress.By oxygen supply refrigerating module, keep dead band and consolidation zone
Temperature in optimized scope, discharge in time by the heat of generation.It is prevented effectively from the interlayer thermal stress that print procedure is led to due to temperature
Problem, improves printing precision and quality.
(6) printed material applicability is wide, expands the technique scope of application.Requirement for different printed materials.By knot
Close compound oxygen permeable membrane and oxygen supply refrigerating module, realize the accuracy controlling to dead band oxygen content, be suitable for different printed materials, expand
The scope of application of this technique.
(7) extend oxygen permeable membrane service life.Carried while for compound oxygen permeable membrane supplemental oxygen by oxygen supply refrigerating module
Walk the amount of heat that solidification produces, prevent the aging of compound oxygen permeable membrane.
(8) present invention makes 3D printing device upper chamber gas boosting by liquid level additional pressure applicator unit, and gases at high pressure force
Resin flows into " dead band " region, accelerates the supplementary speed of resin needed for solidification.When especially large-size components print, Gu
Change center away from " dead band " border entries farther out, under the pressure of gases at high pressure acts on, resin can be at faster speed to admittedly
Change center flowing, solve resin in the case of large scale prints and supplement a difficult problem not in time, realize large-area continuous beat
Print.
(9) present invention achieves large scale, the low cost of arbitrary shape product, high-efficiency and continuous print, suitable material is extensive,
The precision of printout and quality are high, and uniformity is good, and process stabilizing is reliable, has extensive industrial application value.Can be used for table
Face level 3D printer, can be used for technical grade 3D printing again.
Brief description
Fig. 1 is the principle schematic diagram. of the embodiment of the present invention 1 high-speed and continuous photocuring 3D printing device；
Fig. 2 is the structural principle stereogram of the embodiment of the present invention 1 high-speed and continuous photocuring 3D printing device；
Fig. 3 is the embodiment of the present invention 1 window box and oxygen supply cooling chamber explosive view schematic diagram；
Fig. 4 is the embodiment of the present invention 2 high-speed and continuous photocuring 3D printing apparatus structure principle schematic.
Wherein, 1DLP ray machine, 2 ultraviolet LED lamps, 3 oxygen supply cooling units, 4 oilless air compressors, 5 cooling air inlet pipelines, 6 add
It is pressed into air pipe, 7 cooling outlet pipes, 8 oxygen supply cooling chambers, 801 suprasil plates, 9 window boxes, 10 raw material feed units, 11
Cabinet, 12 print platforms, 13 connecting brackets, 14Z to workbench, 15 pressing plates, 16 compound oxygen permeable membranes, 17 seal washers, 18 liquid storages
Groove, 19 ultraviolet LED modules, 20 Fresnel Lenses, 21 LCDs.
Specific embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Embodiment 1
Fig. 1 is the principle schematic diagram. of the embodiment of the present invention 1 high-speed and continuous photocuring 3D printing device, and Fig. 2 is this
The structural principle stereogram of bright embodiment 1 high-speed and continuous photocuring 3D printing device.Embodiment 1 high-speed and continuous photocuring 3D printing
Device includes：DLP ray machine 1, ultraviolet LED lamp 2, oxygen supply cooling unit 3, oilless air compressor 4, cooling air inlet pipeline 5, charged air induction
Pipeline 6, cooling outlet pipe 7, oxygen supply cooling chamber 8, window box 9, raw material feed unit 10, cabinet 11, print platform 12, connection
Support 13, Z-direction workbench 14.Wherein DLP ray machine 1 and the image-generating unit of ultraviolet LED lamp 2 composition are located at cabinet 11 lower chambers；Two
Side is respectively provided with oxygen supply cooling unit 3 and oilless air compressor 4；The image that DLP ray machine 1 produces projects on window box 9 upwards；Window
Mouth box 9 is combined with oxygen supply cooling chamber 8 and is arranged on cabinet 11 central dividing plate, and oxygen supply cooling chamber 8 two ends connect cooling air inlet respectively
Pipeline 5 and cooling outlet pipe 7；The other end of cooling air inlet pipeline 5 is connected with oxygen supply cooling unit 3；Charged air induction pipeline 6
One end be connected with oilless air compressor 4, other end is placed in the upper chamber of cabinet；Print platform 12 is located at directly over window box 9,
And be fixed on Z-direction workbench 14 by connecting bracket 13；Z-direction workbench 14 is fixed in cabinet 11 upper chamber's back plate；Former
Material feed unit 10 is connected with the reservoir 18 of window box 9 by connecting line, and raw material feed unit 10 is placed under cabinet 11
Chamber.
Described DLP ray machine 1 adopts TI company DLP9500UV DMD (DMD), and beam path alignment is integrated in DLP light
In machine 1.DLP ray machine 1 includes dynamic mask signal generating unit, beam path alignment.
Described ultraviolet LED lamp 2 power is 30W, a length of 365nm of ultraviolet light wave.
Described oxygen supply cooling unit 3 includes air compressor machine, vortex tube cooler, interface unit etc..Air compressor machine passes through connector
Part is connected with vortex tube cooler.Oxygen supply cooling unit 3 range of flow is 0.1-10L/min, cooling air inlet pipeline 5, cooling
The working range of outlet pipe 7 is 1-7bar.Temperature 1-15 DEG C of cooling gas.
Described oxygen supply cooling unit 3, cooling air inlet pipeline 5, cooling outlet pipe 7, oxygen supply cooling chamber 8 composition oxygen supply cooling
Module, cooled for cooling air (or certain density cryogenic oxygen) air inlet pipeline 5 is transported to oxygen supply by oxygen supply cooling unit 3
In the closing space of compound oxygen permeable membrane 16 composition of cooling chamber 8 and window box 9, endlessly supplement the oxygen that solidification consumes,
And the heat that photosensitive resin crosslinking curing produces discharged by cooled outlet pipe 7 in time.On the one hand oxygen supply refrigerating module is realized
On the other hand the big calorimetric producing in continuous print procedure is excluded by accuracy controlling to dead band oxygen content in time, keeps dead band
The temperature setting.
The power 6KW of described oilless air compressor 4, operating pressure 1-7bar.
Described oilless air compressor 4, charged air induction pipeline 6, cabinet 11 upper chamber composition liquid level additional pressure applicator module, it is right to realize
The resin quick backflow of dead band and solidification liquid level and supply.
Described cabinet 11 is divided into upper and lower chamber with central dividing plate for boundary.Upper chamber requires air-tightness good, and chassis frame is even
Meet place and adopt high-air-tightness rubber bound, hypocavate has thermal window, and thermal diffusivity is good.
Fig. 3 is the embodiment of the present invention 1 window box 9 and oxygen supply cooling chamber 8 explosive view, described window box 9 include reservoir 18,
Seal washer 17, compound oxygen permeable membrane 16, pressing plate 15.Described oxygen supply cooling chamber 8, pressing plate 15, compound oxygen permeable membrane 16, seal washer
The 17th, the through hole of up/down perforation is had on reservoir 18, wherein oxygen supply cooling chamber 8, pressing plate 15, hole is screwed hole on reservoir 18,
The side of oxygen supply cooling chamber 8 is provided with boss, and there is groove corresponding with oxygen supply cooling chamber 8 convex platform the side of pressing plate 15.Described confession
Oxygen cooling chamber 8 side boss and pressing plate 15 side groove clamping, and it is bolted fastening.Described pressing plate 15 and reservoir 18
It is bolted compression, accompanies compound oxygen permeable membrane 16 and seal washer 17 between the two, and seal washer 17 is located at and is combined
Above oxygen permeable membrane 16.Described oxygen supply cooling chamber 8 one end with cooling air inlet pipeline 5 be connected, the other end with cool down outlet pipe 7 phase
Connect, oxygen supply cooling chamber 8 bottom is provided with suprasil plate 801, and the area of quartz plate should be greater than the imaging area (chi of formation of parts
Very little).
Described compound oxygen permeable membrane 16 is made up of PET porous support layer and PDMS oxygen-rich layer.Wherein, PET porous support layer
Thickness is 100 microns, and PET porous support layer aperture is 1 micron, and porosity is that 80%, PDMS selects the thickness of layer to be 50 microns.
For wavelength, the uv transmittance for 395-405nm is not less than 80% to compound oxygen permeable membrane 16, and oxygen transmission coefficient exists
More than 100barrer, tensile strength is in more than 10MPa.
Described oxygen supply cooling chamber 8 is combined oxygen permeable membrane 16 by jack-up and is at tight state.
Solidify the 3D printing device of liquid photosensitive resin based on above-described embodiment 1 high-speed and continuous projection exposure, realize at a high speed
The method of work of continuous photocuring 3D printing, comprises the steps：
Step 1：Print initial setting up, pretreatment.Open raw material feed unit 10, to reservoir 18 note in window box 9
Enter liquid photosensitive resin；Z-direction workbench 14 drives print platform 12 to be moved downwardly to initialization position, and print platform 12 immerses
To liquid photosensitive resin, and keep about 50 microns of distance with compound oxygen permeable membrane 16.Oxygen enters liquid through compound oxygen permeable membrane 16
State photosensitive resin, forms on film surface in " dead band " of about 20 microns of thickness, the resin in region under the irradiation of ultraviolet light not yet
Can solidify, so Light Curing occurs about 20 microns on compound oxygen permeable membrane 16 of position all the time.
Step 2：Continuous printing-forming part.With setting speed continuance lifting on Z-direction workbench 14, DLP ray machine 1 is continuous simultaneously
Broadcasting aspect image information.The ultraviolet selective that ultraviolet LED lamp 2 produces is irradiated on resin, and print platform 12 constantly will
The resin pull-up of solidification, " dead band " endlessly supplements resin needed for solidification upwards so that print procedure serialization.Continuously beat
During print, oxygen supply cooling unit 3, oilless air compressor 4 is constantly in opening, and raw material feed unit 10 is to reservoir
It is continuously replenished interpolation resin in 18.
Step 3：Post processing.Complete after part prints, to close DLP ray machine 1, ultraviolet LED lamp 2, oxygen supply cooling unit 3, no
Oily air compressor machine 4.Z-direction workbench 14 drives print platform 12 and prints part return in situ.Take off print platform 12 and print zero
Part.Take off printing part from print platform 12.
Embodiment 2
Embodiment 2 printing equipment principle schematic diagram. is as shown in figure 4, produce dynamic mask using lcd technology.
Wherein it is imaged and be made up of ultraviolet LED module 19, Fresnel Lenses 20, LCDs 21, the ultraviolet that ultraviolet LED module 19 produces
Light, after Fresnel Lenses 20 collimation, is irradiated on LCDs 21, image information continuously play by LCDs 21, from
And produce the required projected image of solidification.
Embodiment 3
As another embodiment, it is adjustable that described cooling outlet pipe 7 is set to outlet pressure.When oxygen supply cooling chamber 8
When reaching certain threshold value with the closing space internal gas pressure of compound oxygen permeable membrane 16 composition, just can be discharged with cooled outlet pipe 7, lead to
Cross increasing closing space internal gas pressure, improve the ability through compound oxygen permeable membrane for the oxygen.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not model is protected to the present invention
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not
Need to pay the various modifications that creative work can make or deformation still within protection scope of the present invention.
Claims (10)
1. a kind of high-speed and continuous photocuring 3D printing device, is characterized in that, including：Machine case body, described machine case body is by centre
Dividing plate is divided into upper chamber and lower chambers；Described lower chambers are provided with image-forming module, and described upper chamber is provided with window box and oxygen supply cooling
Module, described window box and the combination of oxygen supply refrigerating module are fixedly mounted on central dividing plate, and described oxygen supply refrigerating module is arranged on
The underface of described window box, described image-forming module is arranged on the underface of described window box；It is provided with directly over described window box
Print platform, described print platform is arranged on Z-direction workbench；Described window box is connected with raw material feed unit；
Described oxygen supply refrigerating module, including oxygen supply cooling chamber, the two ends of described oxygen supply cooling chamber respectively with cooling air inlet pipeline and
Cooling outlet pipe connects, and described cooling air inlet pipeline is connected with oxygen supply cooling unit；Oxygen supply cooling chamber is arranged on window box and beats
The underface of print window, and form closed chamber with print window；
During printing, pass through to control the oxygen content in window cassette bottom portion resin dead band and by continuous print procedure by oxygen supply refrigerating module
The heat of middle release ejects raising print speed in time.
2. a kind of high-speed and continuous photocuring 3D printing device as claimed in claim 1, is characterized in that, also include：Liquid level assists
Pressure module, described liquid level additional pressure applicator module includes the oilless air compressor being arranged in lower chambers, described oilless air compressor with
The entrance of charged air induction pipeline connects, and the outlet of described charged air induction pipeline is arranged in upper chamber, and described upper chamber has gas
Close property；Increase the gas pressure intensity of upper chamber by resin liquid level additional pressure applicator module, during printing, gases at high pressure are to photosensitive resin liquid
Face presses, and accelerates photosensitive resin to the flowing in window cassette bottom portion resin dead band and consolidation zone, realizes resin quick backflow and benefit
Give.
3. a kind of high-speed and continuous photocuring 3D printing device as claimed in claim 1 or 2, is characterized in that,
Described window box adopts separate structure, including：Reservoir, seal washer, compound oxygen permeable membrane and pressing plate；Described oxygen supply is cold
But through hole, the hole of oxygen supply cooling chamber, pressing plate and reservoir are all had on room, pressing plate, compound oxygen permeable membrane, seal washer and reservoir
For screwed hole, the side of oxygen supply cooling chamber is provided with boss, and there is groove corresponding with oxygen supply cooling chamber convex platform the side of pressing plate；Institute
State the boss of oxygen supply cooling chamber and the groove clamping of pressing plate, and be bolted connection；Described pressing plate passes through spiral shell with reservoir
Tether and connect compression, described pressing plate and reservoir accompany compound oxygen permeable membrane and seal washer between the two, and seal washer is located at
Above compound oxygen permeable membrane.
4. a kind of high-speed and continuous photocuring 3D printing device as claimed in claim 1, is characterized in that,
The print window of window box is included using compound oxygen permeable membrane, compound oxygen permeable membrane：Porous support layer and oxygen-rich layer, open support
Layer is located at the lower section of oxygen-rich layer.
5. a kind of high-speed and continuous photocuring 3D printing device as claimed in claim 4, is characterized in that,
Described porous support layer is the film with finger-like or spongy pore structure, and the material of selection includes polytetrafluoroethylene (PTFE)
PTFE, Kynoar PVDF, polyacrylonitrile (PAN), polysulfones PS, polycarbonate, polyethylene terephtalate or poly-
Etherimide PEI, the aperture 50nm-2000nm of porous support layer, porosity 60%-90%, the thickness range of porous support layer
For 10-1000 micron.
6. a kind of high-speed and continuous photocuring 3D printing device as claimed in claim 4, is characterized in that,
Described oxygen-rich layer is the dense film with high oxygen transmission coefficient, the material of selection include polydimethylsiloxane,
Perfluoroethylene-propylene FEP or poly- trimethyl silicane -1- propine PTMSP, the thickness range of oxygen-rich layer is 1-100 micron.
7. a kind of high-speed and continuous photocuring 3D printing device as claimed in claim 4, is characterized in that,
Compound oxygen permeable membrane has oxygen flow and the characteristic of saturating ultraviolet light, and, in more than 10barrer, 365-405nm is purple for oxygen transmission coefficient
Outer light transmission rate is not less than 80%.
8. a kind of method of work of high-speed and continuous photocuring 3D printing device, is characterized in that, comprise the steps：
Step (1)：Print initial setting up, pretreatment：Open raw material feed unit, to the reservoir injection liquid light in window box
Quick resin；Z-direction workbench drives print platform to be moved downwardly to initialization position, and print platform is immersed in liquid photosensitive tree
Fat, and print platform keeps setpoint distance with the compound oxygen permeable membrane in window box；Open oxygen supply cooling unit and oilless air compressor；
Step (2)：Continuous printing-forming part：Z-direction workbench is with setting speed continuance lifting, the continuous broadcast layer of image-forming module simultaneously
Face image information；The ultraviolet selective that ultraviolet LED lamp produces is irradiated on liquid photosensitive resin, and print platform constantly will be consolidated
The resin pull-up changed, window cassette bottom portion resin dead band endlessly supplements liquid photosensitive resin needed for solidification upwards so that beating
Print process continuous；
Step (3)：Post processing：After completing part printing, close image-forming module, oxygen supply cooling unit and oilless air compressor；Z-direction work
Station drives print platform and prints part return in situ；Take off print platform and print part；Finally, part will be printed from beating
Take off on print platform.
9. method as claimed in claim 8, is characterized in that,
In the continuous print procedure of described step (2), oxygen supply refrigerating module works, and oxygen supply cooling unit is by cooling air or setting
It is empty with the closing of the compound oxygen permeable membrane composition of window box that the cooled air inlet pipeline of cryogenic oxygen of concentration is transported to oxygen supply cooling chamber
Interior, endlessly supplement the oxygen that solidification consumes, and the heat that photosensitive resin crosslinking curing is produced by cooled outlet pipe
Amount is discharged in time, realizes the accuracy controlling to dead band oxygen content for compound oxygen permeable membrane supplemental oxygen, takes away what solidification produced simultaneously
Heat, the temperature keeping dead band to set, prevent the aging of compound oxygen permeable membrane.
10. method as claimed in claim 8, is characterized in that,
Described step (2) makes upper chamber's gas boosting by liquid level additional pressure applicator module, and gases at high pressure force resin into dead band
Flowing, accelerates the supplementary speed of resin needed for solidification；
When large-size components print, solidification center away from deadband boundaries entrance farther out, under the pressure of gases at high pressure acts on, is set
Fat quickly to the flowing of solidification center, is realized resin and is supplemented in time, realize large-area continuous printing.
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Effective date of registration: 20200721 Address after: No.30, No.101, Dahe Industrial Zone, Guancheng community, Guanhu street, Longhua District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Intelligent Technology Co.,Ltd. Address before: 266033 Shandong province Qingdao City, Fushun Road No. 11 Patentee before: QINGDAO TECHNOLOGICAL University |