CN106426915B - High-speed continuous photocuring 3D printing device and working method thereof - Google Patents
High-speed continuous photocuring 3D printing device and working method thereof Download PDFInfo
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- CN106426915B CN106426915B CN201610945088.3A CN201610945088A CN106426915B CN 106426915 B CN106426915 B CN 106426915B CN 201610945088 A CN201610945088 A CN 201610945088A CN 106426915 B CN106426915 B CN 106426915B
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Classifications
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
本发明公开了一种高速连续光固化3D打印装置及其工作方法，包括：机箱本体，机箱本体由中间隔板分为上腔室和下腔室；下腔室设有成像模块，上腔室设有窗口盒和供氧冷却模块，窗口盒和供氧冷却模块组合固定安装在中间隔板上，供氧冷却模块设置在所述窗口盒的正下方，所述成像模块设置在所述窗口盒的正下方；所述窗口盒正上方设有打印平台，所述打印平台安装在Z向工作台上；所述窗口盒与原料供给单元连接；本发明结合了窗口盒的复合富氧膜、供氧冷却、液面辅助施压三者的优势，实现了大尺寸、任意形状制件的低成本、高效连续打印，适用材料广泛，打印件的精度和质量高，一致性好，工艺稳定可靠。为高速连续光固化3D打印提供一种工业级解决方案。
The invention discloses a high-speed continuous light-curing 3D printing device and a working method thereof, comprising: a chassis body, the chassis body is divided into an upper chamber and a lower chamber by a middle partition; the lower chamber is provided with an imaging module, and the upper chamber is provided with an imaging module. There is a window box and an oxygen supply and cooling module, the window box and the oxygen supply and cooling module are fixedly mounted on the middle partition, the oxygen supply and cooling module is arranged directly under the window box, and the imaging module is arranged in the window box Just below the window box; a printing platform is arranged directly above the window box, and the printing platform is installed on the Z-direction worktable; the window box is connected with the raw material supply unit; the invention combines the composite oxygen-rich film of the window box, the supply The advantages of oxygen cooling and liquid surface assisted pressure enable low-cost, high-efficiency continuous printing of large-size and arbitrary-shaped parts, a wide range of applicable materials, high precision and quality of printed parts, good consistency, and stable and reliable process. Provides an industrial-grade solution for high-speed continuous photocuring 3D printing.
Description
Technical field
The present invention relates to increasing material manufacturings and 3D printing technique field, and in particular to a kind of continuous photocuring 3D printing dress of high speed
It sets and its working method.
Background technique
Optical soliton interaction is a kind of earliest, most mature at this stage, most widely used increasing material manufacturing (3D printing) skill of development
Art, from initial stereolithography apparatus (Stereolithography, SL), develops perhaps by nearly development in 30 years
Mostly new technique, such as micro- stereolithography (Microstereolithography), integral microstereolithography technology
(Integral SL, Projection Microstereolithography), digital light processing (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 is so that resin is existed using laser galvanometer or mask technical controlling light area
Successively solidify in controllable light area, by generating three-dimensional entity model after successively solidifying superposition.But this point by point scanning light
Curing mode has the following deficiencies: the low (about 8~12x10 of forming efficiency4mm3/h)；There are biggish contraction when solidification, workpiece is produced
Raw buckling deformation.Under the background that the development of point by point scanning photocuring technology tends to be mature, the optical soliton interaction based on surface layer forming
Technology is come into being, and the face forming photocuring technology of mainstream mainly has: the face battle array exposure curing skill based on digital light processing (DLP)
Art and continuous number light processing 3D printing (continuous photocuring 3D printing).Continuous photocuring 3D printing is that one kind for occurring in recent years is non-
Normal 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 of hair, the basic principle of CLIP: using the effect of oxygen inhibition, oxygen through window with
Resin bottom liquid face contact, formed one layer thin cannot be purple by the region of ultra-violet curing, referred to as " dead zone " (Dead Zone)
Outside line still can be transmitted through dead zone, continue to generate polymerization above, while avoiding cured resin and bottom window
The adhesion of mouth.Ultraviolet light Continuous irradiation resin, print platform are also continuously to rise, and realize continuous printing.CLIP technology consolidates light
Change print procedure becomes continuously printing from lamination printing, this brings the uniqueness and significant advantage of three aspects: (1) efficiently, than
Traditional 3D printer wants fast 25-100 times, is theoretically improved the potentiality to 1000 times；(2) high-precision, in high precision with high surface
Quality avoids the step effect of traditional 3D printing, can be unlimited fine and smooth on lift height, realizes and prints without layering；(3) high property
Can, traditional 3D printing part is because of layer structure, and mechanical characteristic is different in all directions, especially in the direction of stacking
On, anti-shear performance is very poor, and the mechanical characteristic of components of CLIP printing is consistent in all directions, improve performance and
Expand application range.
3D printing equipment and traditional maximum difference of uv equipment based on CLIP are to hold liquid photosensitive resin
Print window (reservoir).Traditional face exposure 3D printer is the bottom for holding resin device with the high light transmission glass for coating release film
Portion's window, and the teflon material (Teflon AF) with oxygen flow and saturating ultra violet light resistance energy is used in CLIP technology the bottom of as
Portion's window.Oxygen immerses liquid photosensitive resin through window, and due to the presence of oxygen inhibition, window surface will form certain thickness
The not consolidation zone of (tens microns) is spent, so that resin solidification be made to occur on print window, printing part will not be with slot bottom
Window adhesion, to realize the continuous printing of high speed.But CLIP technique faces some shortcomings and limitation:
(1) price of oxygen flow used in and saturating ultraviolet light teflon material is very expensive, and needs special manufacture
Technique.
(2) when photosensitive resin crosslinks curing reaction, a large amount of heat can be released, leads to beam irradiation area temperature liter
The teflon material of height, oxygen and saturating ultraviolet light is easy after long-time is irradiated because crossing heat ageing, and transparency reduces, and influences
Light efficiency and drip molding quality.
(3) CLIP high speed continuously solidify a large amount of heat sources released, currently existing scheme can not also timely and effectively be discharged with
These heat are discharged, thus the current Forming Workpiece of CLIP technique is limited at lesser size objects printing (small size part generation
Heat it is relatively fewer, heat exchange discharge release is relatively easy).
(4) for the flying print of photosensitive resin, when separating rate reaches it is a certain amount of when, maximum restrict is exactly resin
Back-flow velocity, especially when the viscosity of resin is relatively high, it is more difficult to handle.
Therefore, for the printing of large sized object, the techniques such as CLIP, which are also faced with, cannot achieve bottom dead liquid level and solidification
The quick supply problem of liquid level consumption resin material.Therefore, existing continuous ultraviolet curing process (such as CLIP) is only applicable to small
The typical part shape of the printing of size objects, 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 print speed and further increasing for quality are restricted.There is an urgent need to develop new technique and
Technology.
Summary of the invention
The purpose of the present invention is to solve the above-mentioned problems, provide a kind of continuous photocuring 3D printing device of high speed and its
Working method, it combines the compound oxygen permeable membrane of window box, oxygen supply refrigerating module, liquid level using a kind of new print window
The advantage of additional pressure applicator module three is realized and precisely effectively controls dead zone oxygen content (dead zone oxygen content, dead zone and solidification liquid level
Rapid recharge, solidification process discharge the quick discharge of heat), it realizes to large scale, arbitrary shape drip molding low cost, efficiently connect
Continuous printing.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of continuous photocuring 3D printing device of high speed, comprising: machine case body, the machine case body are divided by intermediate bulkhead
Upper chamber and lower chambers；The lower chambers are equipped with image-forming module, and the upper chamber is equipped with window box and oxygen supply refrigerating module, described
Window box and oxygen supply refrigerating module combination are fixedly mounted on intermediate bulkhead, and the oxygen supply refrigerating module is arranged in the window box
Underface, the underface of the window box is arranged in the image-forming module；Print platform, institute are equipped with right above the window box
Print platform is stated to be mounted on Z-direction workbench；The window box is connect with raw material feed unit；
The oxygen supply refrigerating module, including oxygen supply cooling chamber, the both ends of the oxygen supply cooling chamber respectively with cooling air inlet pipe
Road is connected with cooling outlet pipe, and the cooling air inlet pipeline is connect with oxygen supply cooling unit；Oxygen supply cooling chamber is mounted on window
The underface of box print window, and closed chamber is formed with print window；
When printing, it will be printed by the oxygen content in control window cassette bottom portion resin dead zone and continuously by oxygen supply refrigerating module
The heat discharged in the process ejects raising print speed in time.
A kind of continuous photocuring 3D printing device of high speed, further includes: liquid level additional pressure applicator module, the liquid level additional pressure applicator
Module includes the oilless air compressor being arranged in lower chambers, and the oilless air compressor is connect with the entrance of charged air induction pipeline, institute
The outlet for stating charged air induction pipeline is arranged in upper chamber, and the upper chamber has air-tightness.Pass through resin liquid level additional pressure applicator
Module increases the gas pressure intensity of upper chamber, and when printing, high pressure gas presses to photosensitive resin liquid level, accelerates photosensitive resin to window
Resin quick backflow and supply are realized in the flowing in cassette bottom portion resin dead zone and consolidation zone.
The window box uses separate structure, comprising: reservoir, seal washer, compound oxygen permeable membrane and pressing plate；The confession
Through-hole, oxygen supply cooling chamber, pressing plate and reservoir are provided on oxygen cooling chamber, pressing plate, compound oxygen permeable membrane, seal washer and reservoir
Hole be threaded hole, supply oxygen cooling chamber side be equipped with boss, the side of pressing plate have with supply oxygen cooling chamber convex platform it is corresponding recessed
Slot；The groove clamping of the boss and pressing plate of the oxygen supply cooling chamber, and be bolted connection.The pressing plate and reservoir are logical
It crosses and is bolted compression, the pressing plate and reservoir accompany compound oxygen permeable membrane and seal washer, and seal washer between the two
Above compound oxygen permeable membrane.It supplies oxygen cooling chamber bottom and is equipped with suprasil plate, the area of suprasil plate is greater than imaging area.
The reservoir is for holding liquid photosensitive resin, and the seal washer is for preventing storage liquid photosensitive resin from letting out
Leakage, the pressing plate is for fixing reservoir and compound oxygen permeable membrane.
The print window of window box uses compound oxygen permeable membrane, and compound oxygen permeable membrane includes: that porous support layer and oxygen-rich layer form,
Porous support layer is located at the lower section of oxygen-rich layer.
The 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
It is 10-1000 microns.
The 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 are 1-100 microns.
Compound oxygen permeable membrane has the characteristic of oxygen flow and saturating ultraviolet light, and oxygen transmission coefficient is in 10barrer or more, 365-
405nm uv transmittance is not less than 80%.And there is excellent mechanical performance.
The print window area is greater than imaging area.
The print platform area is less than print window, and the print platform area is equal to or more than imaging area.Printing
Platform is located at right above window box, and with print window keeping parallelism.
The bottom plate of the oxygen supply cooling chamber uses transparency silica glass, and 365-405nm uv transmittance is not less than 90%,
Base areas is greater than imaging area.
The image-forming module includes: ultraviolet LED lamp, and the ultraviolet LED lamp is connect with dynamic exposure mask generation unit.
The ultraviolet LED lamp is ultraviolet LED mould group, and intensity of illumination is adjustable, and is radiated equipped with heat sink and fan.It is purple
The power bracket of outer LED light is 10-200W, wave-length coverage 365-405nm, and the light issued is irradiated to dynamic after beam path alignment
In state exposure mask generation unit.
The dynamic exposure mask generation unit uses Digital Micromirror Device DMD, liquid crystal display LCD or spatial light modulator
SLM.Different type dynamic exposure mask generation unit needs to configure corresponding beam path alignment, and the effect of collimated light path will generate
Ultraviolet light is irradiated in dynamic exposure mask generation unit according to required even angle；Dynamic exposure mask generation unit is located at print window
Lower section generates in image upright projection to the print window of window box.
The 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, comprising: electric precise translation stage, high-precision straight line slide unit or piezoelectricity
Displacement platform.
Movement speed range of the Z-direction workbench in print procedure is 10mm/h-1000mm/h, in non-print process
In moving range be 100mm/min-1000mm/min.
The raw material feed unit includes: raw material material storage tube, is fed connecting tube and metering pump.The raw material material storage tube
It is connect by feed connecting tube with window box, the metering pump is connected with raw material material storage tube and feed connecting tube respectively.Former material
Expect that material storage tube and metering pump are arranged in lower chambers.
The lower chambers are equipped with thermal window.
A kind of working method of the continuous photocuring 3D printing device of high speed, includes the following steps:
Step (1): printing initial setting up, pretreatment: opening raw material feed unit, and the reservoir into window box injects liquid
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 the compound oxygen permeable membrane in print platform and window box keeps set distance；Open oxygen supply cooling unit and oil-free pneumatics
Machine；
Step (2): continuous printing-forming part: Z-direction workbench is with setting speed continuance lifting, while image-forming module is continuously broadcast
Put layer images information；The ultraviolet selective that ultraviolet LED lamp generates is irradiated on liquid photosensitive resin, and print platform is continuous
By cured resin pull-up, endlessly supplement solidifies required liquid photosensitive resin upwards in window cassette bottom portion resin dead zone, makes
Obtain print procedure serialization；
Step (3): after completing part printing, image-forming module, oxygen supply cooling unit and oilless air compressor post-processing: are closed.Z
Print platform and printing part is driven to return to workbench in situ；Remove print platform and printing part；Finally, part will be printed
It is removed from print platform.
It is 10-50 microns that the print platform of the step (1) and the compound oxygen permeable membrane in window box, which keep set distance,.
In the continuous print procedure of the step (2), supplies oxygen cooling unit and oilless air compressor is constantly in open state, and
And addition liquid photosensitive resin is continuously replenished to reservoir in raw material feed unit.
In the continuous print procedure of the step (2), oxygen supply refrigerating module work, oxygen supply cooling unit by cooling air or
The cryogenic oxygen for setting concentration is transported to the envelope of oxygen supply cooling chamber with the compound oxygen permeable membrane composition of window box through cooling air inlet pipeline
It closes in space, endlessly supplement solidifies the oxygen of consumption, and generates photosensitive resin crosslinking curing through cooling outlet pipe
Heat be discharged in time, realize for compound oxygen permeable membrane supplemental oxygen to the accuracy controlling of dead zone oxygen content, while taking away solidification and producing
Raw heat keeps the temperature of dead zone setting, prevents the aging of compound oxygen permeable membrane.
The step (2) makes upper chamber's gas boosting by liquid level additional pressure applicator module, and high pressure gas forces resin to dead
It is flowed in area, accelerates the supplement speed of resin needed for solidifying；
When large-size components print, solidification center farther out, is acted on away from deadband boundaries entrance in the pressure of high pressure gas
Under, resin is quickly flowed to solidification center, is realized that resin is replenished in time, is realized the continuous printing of large area.
The step (2) passes through compound oxygen permeable membrane and oxygen supply refrigerating module collective effect, the oxygen content in control accurate dead zone
With the thickness in dead zone.
Beneficial effects of the present invention:
The collective effect that the present invention comprehensively utilizes compound oxygen permeable membrane, supplies oxygen refrigerating module, 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 realized.By introducing compound oxygen permeable membrane, supplying oxygen cooling mould
Block, liquid level additional pressure applicator module realize the accuracy controlling to printing dead zone oxygen content and dead zone thickness, effectively solve large scale structure
Dead zone and consolidation zone in the quick discharge and release and large-scale part manufacturing process of heat are released in part print procedure
The problem of large area resin quick backflow supply.
(2) production cost is low.Using a kind of compound oxygen permeable membrane of low cost, manufacturing cost is reduced.It is solid to improve continuous light
The performance of chemical industry skill, and being capable of the oxygen content in control accurate dead zone and the thickness in dead zone.
(3) by liquid level additional pressure applicator module, resin back-flow velocity in continuous print procedure is improved, realize dead zone and is consolidated
Change the resin rapid recharge of liquid level, improves print speed；By liquid level additional pressure applicator module, improves large-scale part and produced
Resin back-flow velocity in journey, dead zone and consolidation zone large area resin quickly return in effective solution large-scale part manufacturing process
Problem is flowed, the high speed for realizing arbitrary shape large sized object continuously prints, breaches the existing continuous photocuring 3D such as CLIP and beat
It is imprinted on the restriction in terms of forming dimension, shape, efficiency, precision and cost.
(4) by oxygen supply refrigerating module, the big calorimetric that release is generated in continuous print procedure is discharged in time, is improved continuous
Print speed；By compound oxygen permeable membrane and oxygen supply refrigerating module for the accuracy controlling of dead zone oxygen content, print speed is improved.
By supplying oxygen refrigerating module, it is (available to improve productivity, expansion technique use scope for the oxygen content in one side control accurate dead zone
Printed material)；On the other hand, the heat that can be released photosensitive resin material crosslinking curing quickly excludes, and improves printing
Efficiency, while extending compound oxygen permeable membrane service life, being especially increased the size of printout, (the continuous light such as existing CLIP is solid
Chemical industry skill, the heat generated in Light Curing cannot be excluded effectively and timely, constrain productivity, affect the precision of product,
Particular without the printing of realization large-scale part).
(5) the defects of printing precision is high, avoids thermal stress.By supplying oxygen refrigerating module, dead zone and consolidation zone are kept
In optimized scope, the heat of generation is discharged temperature in time.Effectively avoid print procedure interlayer thermal stress as caused by temperature
Problem improves printing precision and quality.
(6) printed material applicability is wide, expands the technique scope of application.For the requirement of different printed materials.Pass through knot
Compound oxygen permeable membrane and oxygen supply refrigerating module are closed, realizes to the accuracy controlling of dead zone oxygen content, is applicable in different printed materials, is expanded
The scope of application of this technique.
(7) extend oxygen permeable membrane service life.By supplying oxygen refrigerating module band while for compound oxygen permeable membrane supplemental oxygen
The amount of heat for solidifying and generating is walked, the aging of compound oxygen permeable membrane is prevented.
(8) present invention makes 3D printing device upper chamber gas boosting by liquid level additional pressure applicator unit, and high pressure gas forces
Resin is flowed into " dead zone " region, accelerates the supplement speed of resin needed for solidifying.When especially large-size components print, Gu
Farther out away from " dead zone " border entries, under the pressure effect of high pressure gas, resin can be at faster speed to solid for change center
Change center flowing, resin supplement not in time, realizes continuously beating for large area in the case of solving the problems, such as large scale printing
Print.
(9) present invention realizes large scale, the low cost of arbitrary shape product, high-efficiency and continuous printing, and suitable material is extensive,
The precision and quality of printout is high, and consistency is good, and process stabilizing is reliable, has extensive industrial application value.It can be used to table
Face grade 3D printer, and technical grade 3D printing can be used for.
Detailed description of the invention
Fig. 1 is the principle schematic diagram of the continuous photocuring 3D printing device of 1 high speed of the embodiment of the present invention；
Fig. 2 is the structural principle perspective view of the continuous photocuring 3D printing device of 1 high speed of the embodiment of the present invention；
Fig. 3 is 1 window box of the embodiment of the present invention and oxygen supply cooling chamber explosion diagram；
Fig. 4 is the continuous photocuring 3D printing apparatus structure schematic illustration of 2 high speed of the embodiment of the present invention.
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 is to workbench, 15 pressing plates, 16 compound oxygen permeable membranes, 17 seal washers, 18 liquid storages
Slot, 19 ultraviolet LED mould groups, 20 Fresnel Lenses, 21 liquid crystal displays.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
Embodiment 1
Fig. 1 is the principle schematic diagram of the continuous photocuring 3D printing device of 1 high speed of the embodiment of the present invention, and Fig. 2 is this hair
The structural principle perspective view of the continuous photocuring 3D printing device of bright 1 high speed of embodiment.The continuous photocuring 3D printing of 1 high speed of embodiment
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
Bracket 13, Z-direction workbench 14.The imaging unit that wherein DLP ray machine 1 and ultraviolet LED lamp 2 form is located at 11 lower chambers of cabinet；Two
Oxygen supply cooling unit 3 and oilless air compressor 4 is respectively set in side；The image that DLP ray machine 1 generates is projected to upwards on window box 9；Window
Mouth box 9 is combined with oxygen supply cooling chamber 8 and is mounted on 11 intermediate bulkhead of cabinet, and oxygen supply 8 both ends of cooling chamber are separately connected cooling air inlet
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 right above window box 9,
And it is fixed on Z-direction workbench 14 by connecting bracket 13；Z-direction workbench 14 is fixed in 11 upper chamber's back plate of cabinet；It is former
Material feed unit 10 is connected by connecting line with the reservoir 18 of window box 9, and raw material feed unit 10 is placed under cabinet 11
Chamber.
The DLP ray machine 1 uses TI company DLP9500UV Digital Micromirror Device (DMD), and beam path alignment is integrated in DLP light
In machine 1.DLP ray machine 1 includes dynamic exposure mask generation unit, beam path alignment.
2 power of ultraviolet LED lamp is 30W, a length of 365nm of ultraviolet light wave.
The 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 3 range of flow of cooling unit is 0.1-10L/min, cooling air inlet pipeline 5, cooling
The working range of outlet pipe 7 is 1-7bar.1-15 DEG C of the temperature of cooling gas.
The oxygen supply cooling unit 3, cooling air inlet pipeline 5, cooling outlet pipe 7, the oxygen supply composition oxygen supply cooling of cooling chamber 8
Cooling air (or certain density cryogenic oxygen) is transported to oxygen supply through cooling air inlet pipeline 5 by module, oxygen supply cooling unit 3
In the enclosure space that the compound oxygen permeable membrane 16 of cooling chamber 8 and window box 9 forms, endlessly supplement solidifies the oxygen of consumption,
And the heat that photosensitive resin crosslinking curing generates is discharged in time through cooling outlet pipe 7.Refrigerating module is supplied oxygen on the one hand to realize
To the accuracy controlling of dead zone oxygen content, on the other hand the big calorimetric generated in continuous print procedure is excluded in time, keeps dead zone
The temperature of setting.
The power 6KW of the oilless air compressor 4, operating pressure 1-7bar.
The oilless air compressor 4, charged air induction pipeline 6,11 upper chamber of cabinet form liquid level additional pressure applicator module, realization pair
Dead zone and resin quick backflow and the supply for solidifying liquid level.
The cabinet 11 is divided into upper and lower chambers by boundary of intermediate bulkhead.Upper chamber requires air-tightness good, and chassis frame connects
Place is met using high-air-tightness rubber bound, hypocavate is provided with thermal window, and thermal diffusivity is good.
Fig. 3 is 1 window box 9 of the embodiment of the present invention and oxygen supply 8 explosive view of cooling chamber, the window box 9 include reservoir 18,
Seal washer 17, compound oxygen permeable membrane 16, pressing plate 15.The oxygen supply cooling chamber 8, pressing plate 15, compound oxygen permeable membrane 16, seal washer
17, through-hole up and down is provided on reservoir 18, wherein hole is threaded hole on oxygen supply cooling chamber 8, pressing plate 15, reservoir 18,
The side for supplying oxygen cooling chamber 8 is equipped with boss, and there is groove corresponding with oxygen supply 8 convex platform of cooling chamber in the side of pressing plate 15.The confession
8 side boss of oxygen cooling chamber and 15 side groove clamping of pressing plate, and fastening is bolted.The pressing plate 15 and reservoir 18
Compression is bolted, accompanies compound oxygen permeable membrane 16 and seal washer 17 between the two, and seal washer 17 is positioned at compound
16 top of oxygen permeable membrane.Described 8 one end of oxygen supply cooling chamber is connected with cooling air inlet pipeline 5, the other end and cooling 7 phase of outlet pipe
Connection, oxygen supply 8 bottom of cooling chamber are equipped with suprasil plate 801, and the area of quartz plate should be greater than the imaging area (ruler of formation of parts
It is very little).
The compound oxygen permeable membrane 16 is made of PET porous support layer and PDMS oxygen-rich layer.Wherein, PET porous support layer
Thickness is 100 microns, PET porous support layer aperture be 1 micron, porosity 80%, PDMS select layer with a thickness of 50 microns.
Compound oxygen permeable membrane 16 is not less than 80% for the uv transmittance that wavelength is 395-405nm, and oxygen transmission coefficient exists
100barrer or more, tensile strength is in 10MPa or more.
The oxygen supply cooling chamber 8 is at tight state by jacking up compound oxygen permeable membrane 16.
The 3D printing device of 1 high speed successive projection exposure curing liquid photosensitive resin based on the above embodiment realizes high speed
The working method of continuous photocuring 3D printing, includes the following steps:
Step 1: printing initial setting up, pretreatment.Open raw material feed unit 10,18 note of reservoir into 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 at a distance from about 50 microns of compound oxygen permeable membrane 16 holding.Oxygen enters liquid through compound oxygen permeable membrane 16
State photosensitive resin forms about 20 microns of thickness of " dead zone " in film surface, and the resin in region is under the irradiation of ultraviolet light not yet
It can solidify, about 20 microns of the position so Light Curing always happens on compound oxygen permeable membrane 16.
Step 2: continuous printing-forming part.With setting speed continuance lifting on Z-direction workbench 14, while DLP ray machine 1 is continuous
Broadcasting level image information.The ultraviolet selective that ultraviolet LED lamp 2 generates is irradiated on resin, and print platform 12 constantly will
Cured resin pull-up, " dead zone " endlessly supplement solidifies required resin upwards, so that print procedure serialization.Continuously beat
During print, cooling unit 3 is supplied oxygen, oilless air compressor 4 is constantly in open state, and raw material feed unit 10 is to reservoir
Addition resin is continuously replenished in 18.
Step 3: post-processing.After completing part printing, DLP ray machine 1, ultraviolet LED lamp 2, oxygen supply cooling unit 3, nothing are closed
Oily air compressor machine 4.It is in situ that Z-direction workbench 14 drives print platform 12 and printing part to return.Remove print platform 12 and printing zero
Part.Printing part is removed from print platform 12.
Embodiment 2
2 printing equipment principle schematic diagram of embodiment is as shown in figure 4, generate dynamic exposure mask using LCD technology.
It is wherein imaged and is made of ultraviolet LED mould group 19, Fresnel Lenses 20, liquid crystal display 21, ultraviolet LED mould group 19 generates ultraviolet
Light is irradiated on liquid crystal display 21 after the collimation of Fresnel Lenses 20, and liquid crystal display 21 continuously plays image information, from
And it generates and solidifies required projected image.
Embodiment 3
As another embodiment, it is adjustable to be set as outlet pressure for the cooling outlet pipe 7.When oxygen supply cooling chamber 8
With when air pressure reaches certain threshold value in the enclosure space of compound oxygen permeable membrane 16 composition, it can just be discharged, lead to through cooling outlet pipe 7
Air pressure in increasing enclosure space is crossed, the ability that oxygen penetrates compound oxygen permeable membrane is improved.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (2)
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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 University of Technology |