CN109822891A - A kind of high-precision large format stereoprojection 3D printing system and its Method of printing - Google Patents
A kind of high-precision large format stereoprojection 3D printing system and its Method of printing Download PDFInfo
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- CN109822891A CN109822891A CN201910189267.2A CN201910189267A CN109822891A CN 109822891 A CN109822891 A CN 109822891A CN 201910189267 A CN201910189267 A CN 201910189267A CN 109822891 A CN109822891 A CN 109822891A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
- B29C64/129—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/264—Arrangements for irradiation
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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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- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
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Abstract
The invention belongs to 3D printing technique fields, more particularly to a kind of high-precision large format stereoprojection 3D printing system and its Method of printing, the optical path that DLP ray machine is launched enters projection lens by film spectroscope reflective projection, and projection lens projects to the interface of resin in film and resin storage tank；Projection lens side is equipped with laser displacement gauge；Film spectroscope side is additionally provided with image controller, and the monitoring optical path of image controller is overlapped with the projecting light path that film spectroscope reflects；Sample stage is located in resin storage tank, and film is additionally provided in resin storage tank, and mobile control system controls the position movement of resin storage tank, sample stage, film.Three-dimensional geometrical model is cut into two-dimensional picture, and picture is successively read and projected to the interface of film and resin by print system, and exposure forms cured layer, and sample stage decline is detached from film；It is repeated in exposure.The present invention provides a high-precision, the working ability of large format, is provided for micro Process field and advanced accurately cut means.
Description
Technical field
The invention belongs to 3D printing technique fields, and in particular to a kind of high-precision large format stereoprojection 3D printing system and
Its Method of printing.
Background technique
Stereolithography (printing) is with a kind of appearance of rapid shaping technique earliest.Rapid shaping technique or 3D printing technique
Refer to a series of technologies that full size exemplar is directly generated from computer model, they are than traditional machine cut processing
It is fast very much.Since Chuck Hull is since invention stereolithography in 1986, it is quickly played in numerous areas economy
Its effect, such as the visualization of complex component, the error detection of initial designs verify the design function of important initial part,
Examine Theoretical Design etc..In the past few decades as people are in the investment of MEMS (MEMS), minute yardstick is facilitated
Stereolithography occurs, it inherits the basic principle of conventional stereo photoetching, but can reach the precision of micro-meter scale.Based on monochromatic light
The resin solidification technology of son and two-photon even can achieve 200 nanometers of precision.But these technologies are all based on laser spot
It is scanned in resin liquid level or the inside series sequence, largely affects print speed and cost efficiency.This is also facilitated
The appearance of projection Micro stereo lithography, the such as micro- liquid crystal display of appearance of the core of this technology from micro-display device
Picture on micro-display is passed through optical machine imaging simultaneously by the Digital Light Processor (DLP) of device (LCD) and Texas Instrument, 3D printer
The modelling for projecting on photosensitive resin liquid level and solidifying, and generated by the superposition duplicated computer of multilayer.Every kind micro- aobvious
Show that chip has certain size, such as currently a popular high definition resolution ratio 1920X1080, if each pixel imaging size is
10 microns X10 microns, then the area maximum of its primary projection covering is 19.2 millimeters X10.8 millimeters.For other multiplying power light
Machine, the area of projection are also to scale accordingly.Therefore high-precision and large format are to contradictory factor.
Summary of the invention
In view of the above technical problems, the present invention provide a kind of high-precision large format stereoprojection 3D printing system and its
Method of printing provides a kind of micro- stereolithography system based on DLP in the present invention and is designed to deal with the same of high-precision 3D printing
When meet the needs of large format again.This technology, which exists, to be widely applied, from Structural Engineering, material engineering, to biology and medical treatment
Engineering;From macro smooth scale (more than centimetres) to micro-scale (below millimeter).
The specific technical proposal is:
A kind of high-precision large format stereoprojection 3D printing system, including have light source DLP ray machine, further include projection lens,
Resin storage tank；
The optical path that DLP ray machine is launched enters projection lens by film spectroscope reflective projection, and the projection lens projects to
The interface of resin in film and resin storage tank；
The projection lens side is equipped with laser displacement gauge；
The film spectroscope side is additionally provided with image controller, and the monitoring optical path and film of the image controller are divided
The projecting light path of mirror reflection is overlapped；
The sample stage is located in resin storage tank, is additionally provided with film in the resin storage tank, further includes mobile control system, mobile
Control system controls that resin storage tank and sample stage are mobile in horizontal X/Y plane, and control sample stage is highly mobile, control resin storage tank and
Film height it is highly mobile；
Pellicle fixture, bubble scraper are additionally provided with inside the resin storage tank；The pellicle fixture include hollow lower fixture and
Intermediate short tube shape upper fixture；The film is fixed on the lower fixture of pellicle fixture, and one is formed under the extruding of upper fixture
The lateral surface of downwardly convex film surface, the film surface is located under the liquid level of resin；
The film is located at projection lens in the underface of gravity direction.To be conducive to collect the gas occurred in print procedure
Bubble.Bubble scraper is equipped with below the film；The blade of the bubble scraper is in smooth, cylindrical peripheral surface, is installed by spring supporting
On scraping cutter hub, blade is contacted with thin flexible film；The movement of the mobile control system control control scraper.
A kind of high-precision large format stereoprojection 3D printing method, comprising the following steps:
Three-dimensional geometrical model is established on computers；Three-dimensional geometrical model can be further cut into one direction two
The picture of dimension, each picture represent a thin layer in threedimensional model, and the slice direction of model is the Print direction of printer；
The a series of pictures of generation can successively be read by print system and project to the interface of film and resin；When certain
It is interior to have the place of light that generate certain thickness cured layer, corresponding one layer is represented in model representated by projection image；
After upper one layer of completion, which exposes, to be printed, sample stage and sample can decline 1-2 millimeters and be detached from film；
When sample stage return, the thickness that the distance returned less is next layer, the gap between printed sample and film is just filled with
Resin layer needed for printing next layer；It is repeated in exposure, with the layer-by-layer decline of sample stage, model is replicated in resin storage tank
Out.
When the size of sample exceeds the range that chip piece is covered, using the printing model of splicing；One layer of representative model
Picture be cut into multiple will be complete by multiple exposure for each layer in model less than the sub-pictures of single DLP resolution
At, successively project current layer all sub-pictures.
A kind of high-precision large format stereoprojection 3D printing system provided by the invention and its Method of printing, provide one
In high precision, the working ability of large format, in the micro electronmechanical field (MEMS), biologic medical field, industrial connector field and its
He needs the development in micro Process field to provide, and one kind is advanced accurately to cut means.
Detailed description of the invention
Fig. 1 is system structure diagram of the invention；
Fig. 2 is pellicle fixture structural schematic diagram of the invention；
Fig. 3 is bubble blade construction schematic diagram of the invention；
Fig. 4 is Method of printing step schematic diagram of the invention；
Fig. 5 is the error splicing schematic diagram spliced in printing model；Wherein A, the breadth of single exposure；B, x accurately splice in direction,
The splicing of C, x deflection error；B ', y accurately splice in direction, C ', the splicing of y deflection error；
Fig. 6 is three kinds of printing model schematic diagrames；
Fig. 7 is the vertical adjusting step of sample stage and optical axis of the invention.
Specific embodiment
It is described in conjunction with the embodiments the specific technical solution of the present invention.
As shown in Figure 1, a kind of high-precision large format stereoprojection 3D printing system, the DLP ray machine 1 including having light source,
It further include projection lens 4, resin storage tank 8；
The optical path that DLP ray machine 1 is launched enters projection lens 4 by 3 reflective projection of film spectroscope, and the projection lens 4 is thrown
The interface of resin in shadow to film 7 and resin storage tank 8；
The film spectroscope 3 can also be the light splitting eyeglass of the millimeter rank thickness of glass material, but the light wave for using
It is long, reflectance coating is plated in the one side of eyeglass, and another side plating anti-reflection film is to eliminate ghost phenomenon.
4 side of projection lens is equipped with laser displacement gauge 5；
3 side of film spectroscope is additionally provided with image controller 2, the monitoring optical path and film of the image controller 2
The projecting light path that spectroscope 3 reflects is overlapped；
The sample stage 9 is located in resin storage tank 8, is additionally provided with film 7 in the resin storage tank 8, further includes mobile control system,
Mobile control system controls resin storage tank 8 and sample stage 9 in horizontal X/Y plane movement, and control sample stage 9 is highly mobile, control tree
7 height of rouge slot 8 and film it is highly mobile；
Pellicle fixture 10, bubble scraper 6 are additionally provided with inside the resin storage tank 8；Under the pellicle fixture 10 includes hollow
Fixture and intermediate short tube shape upper fixture；The film 7 is fixed on the lower fixture of pellicle fixture 10, under the extruding of upper fixture
A downwardly convex film surface is formed, the lateral surface of the film surface is located under the liquid level of resin；
The film 7 is located at the underface of 4 gravity direction of projection lens.To be conducive to collect the gas occurred in print procedure
Bubble.
Bubble scraper 6 is equipped with below the film 7；The blade 61 of the bubble scraper 6 is in smooth, cylindrical peripheral surface, by bullet
The support of spring 62, which is mounted on, scrapes on cutter hub, and blade 61 is with 7 Elastic Contact of film；The shifting of the mobile control system control scraper
It is dynamic.
The display of print image is the DLP of Texas Instrument, is also possible to reflective liquid crystal screen LCOS, and LCOS is considered than tradition
Transflective liquid crystal screen have the brightness and contrast of better image its each pixel that can adjust reflected light according to the voltage of application
Polarization state.Therefore one piece of polaroid is added in the optical path can allow the reflected light of corresponding polarization pixel to pass through to formation figure
Picture.DLP technology was invented in 1987 by Texas Instrument, and the principle for changing the polarization state of reflected light with liquid crystal display is different, every in DLP
A pixel is a small reflective mirror.It controls the whereabouts of reflected light by deflected micromirror face.Each eyeglass is deflectable ±
10o. bright pixel is exactly that reflected light enters camera lens, and opposite is exactly dark pixel.The gray scale of image is deflected by eyeglass
Frequency control.DLP chip has better ultraviolet light compatibility and higher contrast than liquid crystal chip.The present embodiment makes
Resolution with DLP chip is 1920X1080, and the higher chip of resolution can also be applied.Each micro mirror chip size is
7.6umX7.6um optical source wavelength is 405 nanometers.
In order to ensure the precision of stamp with the size, monitoring camera 2 is applied in printing optical path.Beating on DLP chip
For impression piece when being projected to the interface of film 7 and resin, image must be that clearly, contrast is eager to excel, and be greater than 5:
1.This requires interfaces on the optics focal plane of projection lens 4.For high-precision printing, the depth of focus of projection lens 4 is several
Between ten microns to one two hundred microns.Such size be to multipart mechanical package it is difficult to ensure that.Therefore in hardware group
It after dress, requires the image analysis function with monitoring camera and controls corresponding kinematic axis to make interface on focal plane, be
See image clearly, generally requires the Pixel Dimensions of camera to want the small pixel size equal to DLP, such as the monitoring in the system
2 pixel size of camera is 5 microns.This camera is not only focus function, can be with for tens microns of camera lens of depth of focus
The verticality of sample stage 9 and film 7 relative to camera lens optical axis is adjusted with it.Sample stage 9 or select on film 7 three not
It, usually forms 3 points of right angled triangle on one wire 1 points, is all placed in these three points using camera
On focal plane.This ensures that sample stage 9 or film 7 with focal plane be it is parallel, to guarantee the uniformity of printing precision.
Light path part includes commercialized DLP ray machine 1 in the market, including light source.Projecting light path and monitoring optical path have
Lap, therefore film spectroscope 3 has been used, while clear to image in order to reduce by the two of film spectroscope 3 face reflections
Clear to spend the ghost phenomenon adversely affected, the film spectroscope 3 after having used 5 microns, reflection and transmittance are in 95:5 or so.
The light splitting piece and dichroic cube of other materials be also can.The selection of projection lens 4 need to meet under operation wavelength with
Under several conditions: 1, aperture wants sufficiently large, guarantee DLP image imaging clear and uniform, the pixel of > 90%:2, DLP in image planes
Size is the size that design needs, such as 2 microns or 10 microns；3, camera lens, which is reflected back through, from the interface of film and resin exists
On monitoring camera at picture need to be complete uniform.Sample is controlled in the precision of Print direction and accurately in order to control sample simultaneously
Product platform is relatively parallel with film 7, and this system is side by side installed on high-precision laser displacement gauge 5 by camera lens.In order to control
The precision of Print direction reaches 10 micron dimensions, has used the laser displacement gauge 5 of Keyence company, it is micro- that precision has reached 1
Rice.But to different required precisions, other kinds of displacement meter is also feasible, such as ultrasound displacement meter.The displacement meter is parallel
It is just associated in the optical axis of projection lens 4, therefore perpendicular to the face of displacement meter probe perpendicular to optical axis.Same displacement meter is in a face
Upper 1 points selected not on one wire, usually form 3 points of right angled triangle, displacement meter, which accurately measures, a little to be arrived
The distance of displacement meter, the distance as fruit dot moves meter in place is different, this face is not orthogonal to displacement meter and optical axis.It can lead to thus
The horizontal mechanism for overregulating the plane makes all the points identical to the distance of displacement meter, and such 3 points just define perpendicular to position
Move the face of meter and optical axis.The accurate record of this verticality and position is vital to the accuracy of control Print direction.
As shown in Fig. 2, resin storage tank 8 includes the sample stage 9 of film 7, pellicle fixture 10, bubble scraper 6, immersion.It is described
Pellicle fixture 10 include hollow lower fixture and intermediate short tube shape upper fixture；The film 7 is fixed on pellicle fixture 10
On lower fixture, a downwardly convex film surface is formed under the extruding of upper fixture, the lateral surface of the film surface is located at resin
Under liquid level.Pellicle fixture 10 has 5 millimeters of thickness, and entire pellicle fixture 10 immerses 1 to 2 millimeters of resin so that it is guaranteed that film 7
Lower surface and resin complete wetting, and upper surface keeps drying.Film 7 using primarily to being reduced using the deformation of film
The power born when sample moves up and down in resin, to guarantee the complete of fine structure；The high tension of film 7 is utilized simultaneously
Come define printing in each layer of resin thickness, reduce the time of printing.In use, it is pushed by intermediate short tube shape upper fixture
The film 7 being fixed on hollow lower fixture, so that film 7 is softened 20-30%.Here the material of film 7 can be poly- two
Methyl oxosilane PDMS, PFA or other transparent plastics, thickness is from 25 microns to 100 micron.Certainly it is bonded with solidified resin
The not strong hard window of power is also that can be used, for example spray transparent PDMS on glass surface or add layer of transparent again
PFA plastic foil.Gas inevitably dissolves in when prepared by resin and when printing, these gases are in print procedure due to resin
Subtle bubble can be generated under the interaction of the heat generated in movement and Light Curing with film, these subtle bubbles
It can be combined with each other gradually and form millimetre-sized bubble.And these bubble envelopes are rolled in the intersection of resin and film 7, it can be because
This causes the defect of final printed sample, therefore equipment frame is from the overhead projection of gravity direction to lower section in this invention
Film 7 on, allow for bubble in this way since the effect of buoyancy converges at the lower section of film 7, and introduce below film 7 specially
The bubble scraper 6 of door design, as shown in Figure 3.The blade 61 of bubble scraper 6 be it is blunt, be in smooth, cylindrical peripheral surface, 1.5 millimeters of radius,
Length covers maximum print size.And the blade 61 is that have spring 62 to be supported in scrape on cutter hub, so that the blade when scraping
61 with film 7 or hard window be Elastic Contact, the destruction without causing surface.The resin high for viscosity such as > 100cPs,
Since liquid flowing is very slow, it is not easy to define one layer of meagre resin layer, therefore seriously affected print speed and precision.Liquid
Viscosity is usually reduced with the rising of temperature, and usually very strong incidence relation, many resins improve 30 degrees Celsius
Nearly 40% viscosity can be reduced.So in order to improve the print speed of high viscosity resins and precision, it can be on resin storage tank 8
Temperature control unit is added.In this invention, the temperature of resin storage tank 8 can be in room temperature to adjusting between 100 degrees Celsius.
The mobile control system of the invention, a total of 5 kinematic axis, such as Fig. 1, two axis control resin storage tank 8 and sample stage 9 exist
X/Y plane is mobile simultaneously, controls the Z1 axis of 9 height of sample stage, controls the Z2 axis of resin storage tank 8 and 7 height of film, and control scraper
Axis.In addition to the kinematic accuracy of blade shaft, such as 0.1 millimeter, designed according to the optical accuracy of equipment, other axis motion controls
Precision will be much higher than optical accuracy, for example for 10 microns of optical accuracy, 1 micron of axis is selected to control precision；2 microns
Optical accuracy, select 0.5 micron axis control precision.
The method of printing:
Geometrical model is established on computers, when establishing model if there is being needed when hanging structure plus tiny support knot
Structure, usually buttress shaft.Three-dimensional geometrical model can be further cut into one direction two-dimensional picture, usually black
It is white, there can be gray scale.Each picture represents a thin layer in threedimensional model.The slice direction of model will be beating for printer
India side to.The a series of pictures of generation can successively be read by printer and project to the interface of film 7 and resin.Certain
Certain thickness cured layer can be generated by having the place of light in time, it is represented corresponding one in model representated by projection image
Layer.After upper one layer of completion, which exposes, to be printed, sample stage 9 and sample can decline 1-2 millimeters and be detached from film 7.9 return of sample stage
When, few thickness for returning just next layer, resin needed for the gap between such sample and film 7 is just filled with the next layer of printing
Layer, such as Fig. 4.It is repeated in exposure, with the layer-by-layer decline of sample stage 9, model is replicated out in resin storage tank 8.
Since LCD and DLP chip has certain size, such as the DLP of 1920X1080 pixel, in ten microns of optics
Under precision, the print area that chip piece is covered only has 19.2mmX10.8mm. therefore to work as the size of sample beyond chip piece
The range covered will be a problem.In this invention, a kind of printing model of splicing is proposed.In such a mode,
The picture that one layer of representative model can further be cut into multiple pictures for being less than single DLP resolution, for example, 3800X2000 picture
The picture of element can be divided into the sub-pictures of four 1900X1000, and every sub-pictures will represent a quarter in one layer
Region.It for each layer in model, will be completed by multiple exposure, and successively project all sub-pictures of current layer.Adjacent region
Domain/picture intersection would generally give certain lap to improve mechanical property, and usually 10-30 microns.Each area
The position of the exposure in domain and overlapping all combine accurate control by XY axis.There are two coordinate systems in system, and one is DLP/LCD vertical
Coordinate system, there are one the kinetic coordinate systems for being XY axis composition.If due to the error of mechanical package between the two coordinate systems
Without being substantially parallel, there is offset error, such as Fig. 5 in region that will be adjacent in splicing printing.For this purpose, splicing impression block
The error that can be obtained to measurement in formula compensates, X, and the compensation rate of Y-direction can be different, and the compensation rate of different zones is also not
With, but it is often linear.Due to X, the presence of Y-axis, the sample small for the print size than DLP chip can be whole
The multiple same samples of duplicate printing, can be improved speed when volume production in this way in a breadth.The three kinds of impression blocks marked such as Fig. 6
Formula.Certainly for the sample for needing Splicing model, if breadth is sufficiently small, multiple samples can also be once printed, but generally press
Splice print processing.
For high-precision resin 3D printing equipment, the assembling of ten micron dimensions is extremely difficult to only according to machining and assembling
Precision.And in this invention, film 7, sample stage 9, projection optical axis assembly precision can seriously affect final printout
Precision.Therefore it for different accuracy equipment, introduces different optical instruments and allows printer to reach high-precision plus mechanical adjustment
The print state of degree.For the equipment of 2 micrometer optical precision, because the depth of focus of the projection lens 4 of selection is less than 10 microns,
The point of different location can be controlled with the clarity contrast for the image seen in monitoring camera to the vertical range of camera lens
And be accurate in 10 microns, to guarantee that plane is accurately parallel to the image planes of projection lens 4 and perpendicular to optical axis.For projection lens
First 4 depth of focus is greater than the 3D printing equipment of required precision, such as the equipment of 10 microns and 50 micrometer optical precision, needs auxiliary
Optical device, the laser displacement gauge 5 of Keyence company has been selected in the invention, can reach 1 micron of measurement accuracy.?
First use equipment perhaps equipment in use for some time because artificial maloperation or the update of hardware need to adjust again
The system mode of whole printer.Adjustment mainly has two aspects, first is that film/hard window and sample stage 9 are to 4 optical axis of projection lens
Verticality, if two faces are parallel to each other all perpendicular to optical axis, between them；Second is that film/hard window lower surface phase
For the accurate distance of 9 upper surface of sample stage, because this distance determines sample in the precision of Print direction.It first has to guarantee
4 optical axis of projection lens with the probe of laser displacement gauge 5 be it is parallel, optical axis is perpendicular to the face for guaranteeing vertical relative to laser
's.Set-up procedure is as follows:
1. removing film/hard window, sample stage 9 is moved on in the measurement distance of laser displacement gauge 5, successively the table on sample stage 9
Face is chosen to three points of right angled triangle, and point spacing is the bigger the better in the range of machinery allows.The reading of displacement meter is recorded,
According to the deviation that reading provides, the thin teeth screw of adjustment control 9 two angles inclined vertically of sample stage is read until 3 points
Difference no more than design error, general ten microns, as shown in Figure 7.
2. sample stage 9 is moved to projection lens 4 using the feedback of monitoring camera after sample stage 9 adjusts vertically
Focal plane records the position of displacement meter and 9 axis Z1 of sample stage, the initial position both printed.
3. using 3 points of adjustment films at right angle trigonometry/hard window perpendicular to optical axis.Film axis Z2 and position are utilized later
Move the position of focal plane that the lower surface of film 7 is moved to record by meter.After being adjusted, focal plane, film 7 and sample stage 9 it is opposite
Position is had recorded by precise definition, this provides adequate condition for the accurate dimension control in subsequent printing.
Claims (5)
1. a kind of high-precision large format stereoprojection 3D printing system, the DLP ray machine including having light source, which is characterized in that also
Including projection lens, resin storage tank；
The optical path that DLP ray machine is launched enters projection lens by film spectroscope reflective projection, and the projection lens projects to
The interface of resin in film and resin storage tank；
The projection lens side is equipped with laser displacement gauge；
The film spectroscope side is additionally provided with image controller, and the monitoring optical path and film of the image controller are divided
The projecting light path of mirror reflection is overlapped；
The sample stage is located in resin storage tank, is additionally provided with film in the resin storage tank, further includes mobile control system, mobile
Control system controls that resin storage tank and sample stage are mobile in horizontal X/Y plane, and control sample stage is highly mobile, control resin storage tank and
Film height it is highly mobile；
Pellicle fixture, bubble scraper are additionally provided with inside the resin storage tank；The pellicle fixture include hollow lower fixture and
Intermediate short tube shape upper fixture；The film is fixed on the lower fixture of pellicle fixture, and one is formed under the extruding of upper fixture
The lateral surface of downwardly convex film surface, the film surface is located under the liquid level of resin.
2. a kind of high-precision large format stereoprojection 3D printing system according to claim 1, which is characterized in that described
Film is located at projection lens along the underface of gravity direction.
3. a kind of high-precision large format stereoprojection 3D printing system according to claim 1 or 2, which is characterized in that institute
Bubble scraper is equipped with below the film stated；The blade of the bubble scraper is in smooth, cylindrical peripheral surface, is mounted on and is scraped by spring supporting
On cutter hub, blade is contacted with thin flexible film；The movement of the mobile control system control control scraper.
4. a kind of high-precision large format stereoprojection 3D printing method, which is characterized in that exploitation right 1 is described in any item to power 3
A kind of high-precision large format stereoprojection 3D printing system is printed, comprising the following steps:
Three-dimensional geometrical model is established on computers；Three-dimensional geometrical model can be further cut into one direction two
The picture of dimension, each picture represent a thin layer in threedimensional model, and the slice direction of model is the Print direction of printer；
The a series of pictures of generation can successively be read by print system and project to the interface of film and resin；When certain
It is interior to have the place of light that generate certain thickness cured layer, corresponding one layer is represented in model representated by projection image；
After upper one layer of completion, which exposes, to be printed, sample stage and sample can decline 1-2 millimeters and be detached from film；
When sample stage return, the thickness that the distance returned less is next layer, the gap between printed sample and film is just filled with
Resin layer needed for printing next layer；It is repeated in exposure, with the layer-by-layer decline of sample stage, model is replicated in resin storage tank
Out.
5. a kind of high-precision large format stereoprojection 3D printing method according to claim 4, which is characterized in that work as sample
Size exceed the range that is covered of chip piece, using the printing model of splicing；The picture that one layer of representative model is cut into multiple
Each layer in model will be completed by multiple exposure less than the sub-pictures of single DLP resolution, successively projection is current
All sub-pictures of layer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910189267.2A CN109822891B (en) | 2019-03-13 | 2019-03-13 | High-precision large-format stereoscopic projection 3D printing system and printing method thereof |
| PCT/CN2019/083761 WO2020181620A1 (en) | 2019-03-13 | 2019-04-23 | High-precision large-format stereoscopic projection 3d printing system and printing method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910189267.2A CN109822891B (en) | 2019-03-13 | 2019-03-13 | High-precision large-format stereoscopic projection 3D printing system and printing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109822891A true CN109822891A (en) | 2019-05-31 |
| CN109822891B CN109822891B (en) | 2023-09-08 |
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| WO2020181620A1 (en) | 2020-09-17 |
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