CN106079435B - 3D printing device and method - Google Patents

3D printing device and method Download PDF

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Publication number
CN106079435B
CN106079435B CN201610393197.9A CN201610393197A CN106079435B CN 106079435 B CN106079435 B CN 106079435B CN 201610393197 A CN201610393197 A CN 201610393197A CN 106079435 B CN106079435 B CN 106079435B
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China
Prior art keywords
curtain
coating
coating head
applicator
coat
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Expired - Fee Related
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CN201610393197.9A
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CN106079435A (en
Inventor
许小曙
雅各布·贾马尔
李清
赖端
肖朋
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Hunan Farsoon High Tech Co Ltd
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Guangzhou Nansha 3d Printing Innovation Research Institute
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Priority to CN201610393197.9A priority Critical patent/CN106079435B/en
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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
    • 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

Abstract

The present invention relates to a kind of 3D printing device and method.A kind of 3D printing method coats photaesthesia type working solution using curtain applicator in the curing plane of moulding cylinder, the curtain applicator has liquid outlet, curtain is formed from the working solution of liquid outlet extrusion, with the curtain applicator and the relative motion of the curing plane, the curtain is coated uniformly in the curing plane and forms coat, in coating procedure, the height of the curtain is controlled to be less than 50mm.Present invention research finds that not its higher state of curtain is more stable in curtain coating procedure, meets the short curtain of condition, and such as height is less than the curtain of 50mm, its stability is more excellent, and can save the device space, makes the method that curtain coats more economical and practical.

Description

3D printing device and method
Technical field
The present invention relates to 3D printing technique field, more particularly, to a kind of 3D printing device and method.
Background technology
SLA (Stereo Lithography) technology is the photopolymerization principle work based on liquid photosensitive resin, is common 3D printing One of technology.Common SLA equipment generally includes light source, the liquid bath for accommodating photosensitive resin, and controller and one can rise The support platform of drop, moulding cylinder (also known as working cylinder or manufacture cylinder) is placed in support platform.During 3D printing, by liquid photosensitive resin Fill with a liquid bath, control light beam scans on resin liquid level, and the presence or absence of the track of scanning and hot spot are come by controller Control, the place of hot spot irradiation, liquid curing.When curing beginning, the depth of the next thickness of curing plane of moulding cylinder is controlled, Hot spot elective irradiation and cures liquid on liquid level；After the completion of one layer of scanning, not illuminated place is still liquid resin； Then control moulding cylinder to decline a layer height, coat one layer of resin again in the aspect of cured shaping, then carry out the layer again Illumination scanning, make new cured one layer be firmly sticked in before cured layer on, so repeat until whole three-dimensional article system Make and finish, obtain a 3D solid.
At present in photocuring technology, how next layer of liquid resin is realized in the three-dimensional body topsheet surface of work in-process Coating be people's relation research topic, the way of generally use is to skim over three-dimensional article using scraper with the height of a thickness Body is implemented.But the shortcomings that this way, is, scraper when promoting in front of accumulation have substantial amounts of liquid resin, easily in scraper With the power that acts of three-dimensional body, the especially edge in three-dimensional body, this active force can be allowed to deform or damage, together When be also possible to cause liquid level out-of-flatness.These problems can be realized by slowing down the coating speed of scraper, but mean applying More times will be wasted during covering, so as to reduce SLA process efficiencies.In actual mechanical process, in order to realize preferable painting Cover effect, the coating procedure of scraper type take it is huge, occupy the whole processing technology time more than half.This problem is viscous with height Spend use of the resin in SLA and become more prominent.High viscosity resins material product has better performance, but obviously , the high viscosity of material reduces the coating speed of scraper to a certain extent.
It can overcome the above problem using the method for curtain coating.It is liquid curtain using the method key of curtain coating Stability, while to take into account and consider this method convenience and practicality implemented in uv equipment.Materialize is public Department is referred to a method in patent WO9729901A1, and develops Mammoth uv equipments according to the method.For curtain The stability of curtain, Materialize companies think that curtain is higher, its state is more stable, and short curtain is inadequate " fixation ", easily Occur to pull phenomenon under active force, cause curtain destruction and liquid splash.Based on this understanding, used in Mammoth equipment Higher curtain design, its height is 125mm.
But in the curtain painting method real process of Materialize companies use, there are the following problems：1st, coating is opened , it is necessary to which one section of long initial distance makes curtain reach stable state before beginning；2nd, the curtain formed is easily subject to air drag Influence.The former causes uv equipment to must be provided with more huge space to accommodate initial distance, and the latter causes designers A protective cover must be designed in coating unit, for reducing the influence of air drag, but these solutions cause its curtain The economy and practicality of formula painting method substantially reduce.
The content of the invention
Based on this, it is necessary to which providing a kind of can make curtain be rapidly achieved stable state and be not easy what is influenced by air drag 3D printing device and method.
The present invention is that the technical solution for solving above-mentioned technical problem is：
A kind of 3D printing method, includes the following steps：
Photaesthesia type working solution is coated in the curing plane of moulding cylinder using curtain applicator, the curtain coats utensil There is liquid outlet, curtain is formed from the working solution of liquid outlet extrusion, with the curtain applicator and the curing plane Relative motion, the curtain are coated uniformly in the curing plane and form coat, in coating procedure, control the curtain Height be less than 50mm；
Using light source in default making choice property of the site illumination of the coat, make the working solution at default site Curing molding；
The curing plane is controlled to decline the height of one layer of coat coated recently, on cured molding coat Continue coating work liquid, form new coat, and the new coat is irradiated in default site using the light source；
Above-mentioned action is repeated until completing required 3D printing.
In one of the embodiments, the movement velocity v of the curtain applicator or the curtain meets：
Wherein, t is the thickness of the curtain, and σ is the surface tension of the curtain, and ρ is the density of the working solution.
In one of the embodiments, the thickness of the curtain is designed according to the thickness of coat to be formed, the curtain The thickness of curtain is equal with the thickness of the coat.
In one of the embodiments, the 3D printing method further includes makes the curtain reach stable shape before coating The step of state, specifically before coating, after the liquid outlet goes out liquid, the curtain applicator is accelerated with non-steady state Pre-determined distance is run, until the curtain from liquid outlet extrusion reaches stable state.
Present invention also offers a kind of 3D printing equipment, it includes moulding cylinder, light source, liquid storage container and curtain applicator； The support component of the moulding cylinder is Liftable type structure；The light source and the curtain applicator are located at the upper of the moulding cylinder Side；The curtain applicator has inlet and liquid outlet and is internally provided with the pressure connected with the inlet and the liquid outlet The distance between curing plane of power equalizing tank, the liquid outlet and the moulding cylinder is less than 50mm；The liquid storage container and institute State and connected by liquid-transport pipe-line between the inlet of curtain applicator.
In one of the embodiments, the curtain applicator includes the first coating head and the second coating head；Described first Is equipped with first pressure groove in coating head, is equipped with second pressure groove in the second coating head, described first coats head and described the Two coating heads are fixedly connected and first pressure groove and the second pressure groove corresponding matching form the pressure equalizing tank, and described the There is the gap for connecting the pressure equalizing tank, the gap shape between the bottom of one coating head and the bottom of the described second coating head Into the liquid outlet；
The inlet is located on the first coating head, and the quantity of the inlet is at least one, if it is described into Liquid mouth have it is multiple, multiple inlets described first coating head on be uniformly distributed, the distance between adjacent inlet is no More than 100mm.
In one of the embodiments, the first pressure groove and the second pressure groove are semi-cylindrical groove, described First pressure groove coordinates the pressure equalizing tank for forming cylinder with the second pressure groove.
In one of the embodiments, the curtain applicator further includes inner lining plate, and the inner lining plate is located at described first Coat between head and the second coating head, to adjust the bottom of the first coating head and the bottom of the described second coating head Between gap width.
In one of the embodiments, pass through between the first coating head, the inner lining plate and the second coating head Multiple screws being placed equidistant with are fixedly connected, at a distance of being no more than 50mm between adjacent screw, and the screw position and The distance between described pressure equalizing tank is no more than 10mm.
In one of the embodiments, the internal diameter of the pressure equalizing tank is 5~7mm.
During substantial amounts of theory and practice of the invention, it is found surprisingly that, is not that curtain is higher in curtain coating procedure Its state is more stable, meets the short curtain of condition, and such as height is less than the curtain of 50mm, its stability is more excellent, and can save The about device space, makes the method that curtain coats more economical and practical.
Brief description of the drawings
Fig. 1 is the principle schematic that the curtain of an embodiment coats；
Fig. 2 is the sectional view of the curtain applicator of an embodiment；
Fig. 3 is the sectional view at another visual angle of curtain applicator shown in Fig. 2.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In attached drawing Give presently preferred embodiments of the present invention.But the present invention can realize in many different forms, however it is not limited to this paper institutes The embodiment of description.On the contrary, the purpose for providing these embodiments is to make the understanding to the disclosure more thorough Comprehensively.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to To another element or it may be simultaneously present centering elements.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention The normally understood implication of technical staff is identical.Term used in the description of the invention herein is intended merely to description tool The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more phases The arbitrary and all combination of the Listed Items of pass.
The 3D printing method of one embodiment, the principle coated using curtain, is specifically comprised the following steps：
Step 1：Photaesthesia type working solution, curtain coating are coated in the curing plane of moulding cylinder using curtain applicator Utensil has liquid outlet, from liquid outlet extrusion working solution formed curtain, with curtain applicator with cure plane relative motion, Curtain is coated uniformly on to cure forms coat in plane, in coating procedure, controls the height of curtain to be less than 50mm.
Curtain applicator can use common extrusion type applicator, its liquid outlet with strip.
Photaesthesia type working solution can be but not limited to various photocurable resin materials etc., such as use acrylate and epoxy The common resin material that resin mixing match obtains.
In the present embodiment, the step of making curtain reach stable state is further included before step 1, is specifically being formed Before effective coat, after liquid outlet goes out liquid, by curtain applicator with non-steady state Accelerating running pre-determined distance, until Reach stable state from the curtain of liquid outlet extrusion.
In the present embodiment, the movement velocity v of curtain applicator or curtain meets：
Wherein, t is the thickness of curtain, and σ is the surface tension of curtain, and ρ is the density of working solution, similarly hereinafter.
Meet that the derivation of the movement velocity v of above-mentioned relation is as follows：
As shown in Figure 1, the thickness for removing the curtain fallen is t, it is R in a certain section of radius of curvature, in the movement side of curtain Take a segment unit length ds upwards (wherein the vertical length of curtain is L).
Centrifugal force makes curtain along the circular motion that curvature is R, so as to have：
Wherein, ρ is the density of the density, i.e. curtain of working solution；
On the other hand, each face of effect of surface tension curtain and coat, so as to provide a total centripetal force：
Wherein σ is the surface tension of curtain；
During in when stable state, Fcf=Fcp, or
I.e.
As product tv2It is less thanValue when, centrifugal force plays a major role, arc radius will be broken；As product tv2Greatly InValue when, arc radius R will tend to infinite, and the vertical smooth of change is not produced any radian by curtain.Strictly speaking, wrap Include that including gravity and other also must be considered that the possible active force of curtain, but even in stringenter derivation In, as long as tv2Product when exceeding a certain minimum value, curtain can become vertical steady.
Theory and practice all shows whether " fixation " is unrelated with the height of curtain for curtain, and uses short curtain can be Equipment provides more spaces when designing, such as makes equipment overall compacter, and space availability ratio higher, prevents without additional designs Shield reduces air pressure impacts etc..Further experiment also indicates that, when the height of curtain is 50mm or is following, air resistance The influence of power can almost be ignored, and such case makes coating speed (i.e. above-mentioned relative motion speed in testing in detail below Degree) it is verified when reaching 2000mm/s.
It is understood that long curtain is easier to be influenced be subject to factors such as air drag, and then influence the stabilization of curtain Property, therefore Materialize is when using the curtain height of 125mm, it has to protective cover is installed on coating unit to reduce Influence.And curtain short in real process is affected by environment very small, the air impact being subject to can almost be ignored, without for apply Coating device designs protective cover.
So as to which the curtain of stable state can be obtained according to above-mentioned analysis, it expires with curing the speed of related movement v of plane The following relation of foot：
Further, the thickness of curtain is determined by the thickness of coat, and the thickness of curtain is equal with the thickness of coat.
Further, by reducing curtain height and/or improving curtain acceleration of motion, curtain can be shortened and reach stable shape The initial distance run before state.During using curtain coating, stable liquid curtain can be formed in coating procedure In be divided into starting stage and stabilization sub stage, curtain applicator is in the starting stage with one section of initial distance of non-steady state Accelerating running Afterwards, can be only achieved the stabilization sub stage forms stable liquid curtain, and the coating of starting stage is given up because curtain is discontinuous, the stabilization sub stage Curtain could implement effectively to coat.
Found in experiment, in the case where possessing and to form the same terms of stable curtain, curtain is highly smaller, and initial distance is smaller, Curtain height is bigger, and initial distance is accordingly also big, and the curtain acceleration for improving the starting stage can also reach shortening initially away from From purpose.This discovery provides good effect to equipment design, can be by initially by selecting a less curtain height Distance diminishes, so as to save uv equipment space, and make it that device structure is compacter, economical.In the research of the present embodiment Middle discovery, once curtain had just reached stable state before initial distance value 100mm, and the speed of applicator is 1500mm/ at this time s。
Further, the present embodiment is not less than 2mm by theory analysis and experimental study, the highly preferred of curtain.
Step 2：Using light source in default making choice property of the site illumination of coat, make the working solution at default site Curing molding.
Step 3：Control cures the height that plane declines one layer of coat coated recently, in cured molding coating Continue coating work liquid on layer, form new coat, and new coat is irradiated in default site using light source.
Step 4：Above-mentioned action is repeated until completing required 3D printing.
Curtain coating described in the present embodiment refers to a kind of working solution being under specified pressure, in applicator (such as curtain Applicator) on be extruded to form curtain shape, carry out relative motion and the mode that is coated with coated object.Curtain coats Not only it is avoided that the three-dimensional body destruction with the direct phase interaction of extensive work liquid so as to generation because of spreader, but also coats speed The time for considerably beyond the coating speed using scraper, shortening material coating is spent, has increased exponentially SLA process efficiencies.
In a specific research reduces the experiment of curtain height, the coating speed that curtain coating uses is 2000mm/s, The relation met according to curtain applicator and curtain velocity：
Two kinds of height of 100mm, 48mm have been separately designed to verify the stability of curtain.Result of the test shows, in coating speed In the case that degree meets condition, two kinds of height can form the curtain of " fixation ", but the curtain of 100mm height is in coating procedure Because the reason for air drag occurs " pulling " phenomenon, and the curtain of 48mm height shows stabilization in coating procedure, substantially Air drag influence can be ignored.This, but also can be in air the result shows that short curtain not only can also form stable state Show more outstanding under drag effect, relatively low coating height can be used to realize in the equipment using curtain coating stable Coating, considers air drag without excessive, saves the device space.
In another research reduces the experiment of coating initial distance, it is 1.5m/s to coat head or curtain velocity, according to curtain The relation that applicator meets with curtain velocity：
100mm, 48mm are separately designed and have coated two kinds of height to be tested, and further the difference of design coating head adds Speed.Result of the test shows that using the curtain of 48mm when coating head uses the acceleration of higher, experience 100mm's or so is initial Distance has just reached stable state, and the curtain of 100mm after initial distance it is much bigger.This is the result shows that short curtain energy Shorten initial distance, big quantity space is saved to uv equipment, while raw material can also be saved, improve coating efficiency.
The 3D printing method of the present embodiment is a kind of method for being successively formed by curing three-dimensional body, and the three-dimensional body is logical Cross and be formed by curing photaesthesia type working solution in layer, wherein it is the shape on the layer or substrate having been cured that new layer, which cures, Into the coating method of working solution is consistent between each layer, and the curtain applicator by one with liquid outlet flows out, and forms liquid curtain Curtain shape, and by adjusting the movement velocity of curtain applicator or curtain in working solution coating procedure, stable liquid curtain is obtained, And by adjusting curtain height, particularly in the case where curtain is highly less than 50mm, curtain can shorten initial distance, quickly Reach the state of steady and continuous.Using the 3D printing method of the curtain-type of the present embodiment, the three-dimensional manufacture of realization of energy fast and stable During new one layer of working solution coating, and make existing curtain coating method more convenient, efficient.
The present embodiment additionally provides a kind of 3D printing equipment, it includes moulding cylinder, light source, liquid storage container and curtain coating Device.
The support component of moulding cylinder is Liftable type structure.Light source and curtain applicator are located at the curing plane of moulding cylinder Top.
Incorporated by reference to Fig. 2 and Fig. 3, curtain applicator 100 has inlet 102 and liquid outlet 104 and is internally provided with and feed liquor The pressure equalizing tank 106 that mouth 102 and liquid outlet 104 connect.Liquid outlet 104 is less than 50mm with curing the distance between plane.Storage Connected between liquid container and the inlet 102 of curtain applicator 100 by liquid-transport pipe-line.
Specifically, in the present embodiment, curtain applicator 100 includes the first coating first 110 and the second coating first 120.The First pressure groove 112 is equipped with one coating first 110.Second pressure groove 122 is equipped with second coating first 120.First coating first 110 It is fixedly connected with the second coating first 120 and first pressure groove 112 forms pressure equalizing tank with 122 corresponding matching of second pressure groove 106.There is the gap for connecting pressure equalizing tank between the bottom of first coating first 110 and the bottom of the second coating first 120, between being somebody's turn to do Gap forms liquid outlet 104.It is understood that in other embodiments, liquid outlet 104 can also directly be opened in the first coating first 110 Bottom or second coating first 120 bottom.Compared by being respectively provided with head tank in two coating heads only with unilateral groove Way has more advantage, this is because since both sides are designed with head tank, the cross-sectional area of the pressure equalizing tank formed becomes more Greatly, to realize that the diameter of the balanced required groove of pressure becomes shorter, so as to reduce the height of coating head.
In the present embodiment, the first coating first 110 is equipped with multiple inlets 102.Multiple inlets 102 are in the first coating It is uniformly distributed on first 110, and the distance between the 102 of adjacent inlet is no more than 100mm.It is understood that in other embodiments, The quantity of inlet 102 can also only have one.
Further, in the present embodiment, first pressure groove 112 and second pressure groove 122 are semi-cylindrical groove, and first presses Power groove 112 coordinates the pressure equalizing tank 106 for forming cylinder with second pressure groove 122.The internal diameter of pressure equalizing tank 106 is preferably 5~7mm.To ensure that working solution reaches isobaric effect in the pressure equalizing tank 106 of cylinder, designs multiple inlets 102 to pressure Injection working solution in power equalizing tank 106, each inlet 102 are responsible for the distance of one section of equal filling working solution, therefore cylinder The internal diameter of the pressure equalizing tank 106 of shape can also accordingly reduce.
In addition, in the present embodiment, curtain applicator 100 further includes inner lining plate 130.Inner lining plate 130 is preferably using extension The preferable copper of property is molded.Inner lining plate 130 is located between the coating of the first coating first 110 and second first 120 and is coated with first First 110 and second coating first 120 top side wall and both ends side wall sealing coordinate.First coating first 110 and the second coating First 120 are separated in bottom by inner lining plate 130 and form the gap of the strip connected with pressure equalizing tank 106, the gap shape Into liquid outlet 104.The width of thickness, that is, liquid outlet 104 of inner lining plate 130.It is understood that the design side of being of inner lining plate 130 Just the width of liquid outlet 104 adjusts, and in the curtain applicator 100 of a width fixed demand, can be provided directly as institute The gap of width is needed, inner lining plate 170 can also need not be set to be adjusted.
The first of the present embodiment coats to be placed equidistant between first 110, the coating of inner lining plate 130 and second first 120 by multiple Screw 140 be fixedly connected.Apart it is no more than 50mm between adjacent screw 140, and 140 position of screw is balanced with pressure The distance between groove 106 is no more than 10mm.This compact screw 140, which connects design, can be more nearly liquid outlet 104, such as spiral shell The bottom reachable 15mm, or even smaller apart of silk 140 and curtain applicator 100, and the cross section of whole curtain applicator 100 is very It can extremely be designed to as low as 30mm*30mm or so, greatly alleviate the quality of curtain applicator 100, so that when coating beginning Using the acceleration of bigger, either the applicator of deceleration and lightweight can reduce the institute in acceleration or moderating process at the end of either The vibration or impact received.In addition, there is good ductility using the curtain applicator 100, as long as meeting above-mentioned design On the basis of, pass through the extension of similar structures design, it is possible to achieve prepared by the curtain applicator 100 of different length demand.
In addition, the 3D printing equipment further include compression pump, pressure sensor, controller, first filter, damper, return The component such as receptacle and the second filter.Wherein, compression pump is used to the working solution in liquid storage container being pumped into inlet 102.Pressure Force snesor is used to detecting the pressure of liquid-transport pipe-line, inlet and/or the working solution in pressure equalizing tank 106, and by the pressure The operating power that numeric feedback is pumped to controller, controller according to the pressure value control pressure of the Real-time Feedback.First filtering Device and damper are located on liquid-transport pipe-line.The working solution pumped out from liquid storage container after first filter filters, passes through successively Enter inlet 102 after damper current stabilization.Returnable is used to recycle unnecessary working solution.Between returnable and liquid storage container Connection, and the second filter is equipped between, with to being reused after the filtering of the working solution of recycling.
During substantial amounts of theory and practice of the invention, it is found surprisingly that, is not that curtain is higher in curtain coating procedure Its state is more stable, meets the short curtain of condition, and such as height is less than the curtain of 50mm, its stability is more excellent, and can save The about device space, makes the method that curtain coats more economical and practical.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, its description is more specific and detailed, but simultaneously Cannot therefore it be construed as limiting the scope of the patent.It should be pointed out that come for those of ordinary skill in the art Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (9)

  1. A kind of 1. 3D printing method, it is characterised in that include the following steps：
    Photaesthesia type working solution is coated in the curing plane of moulding cylinder using curtain applicator, the curtain applicator has Liquid mouth, curtain is formed from the working solution of liquid outlet extrusion, as the curtain applicator is opposite with the curing plane Movement, the curtain are coated uniformly in the curing plane and form coat, in coating procedure, control the height of the curtain Degree is less than the movement velocity v satisfactions of 50mm, the curtain applicator or the curtain：
    <mrow> <mi>v</mi> <mo>&amp;GreaterEqual;</mo> <msqrt> <mfrac> <mrow> <mn>2</mn> <mo>&amp;CenterDot;</mo> <mi>&amp;sigma;</mi> </mrow> <mrow> <mi>&amp;rho;</mi> <mo>&amp;CenterDot;</mo> <mi>t</mi> </mrow> </mfrac> </msqrt> </mrow>
    Wherein, t is the thickness of the curtain, and σ is the surface tension of the curtain, and ρ is the density of the working solution；
    Using light source in default making choice property of the site illumination of the coat, cure the working solution at default site Shaping；
    Control the curing plane to decline the height of one layer of coat coated recently, continue on cured molding coat Coating work liquid, forms new coat, and irradiates the new coat in default site using the light source；
    Above-mentioned action is repeated until completing required 3D printing.
  2. 2. 3D printing method as claimed in claim 1, it is characterised in that the thickness of the curtain is according to coat to be formed Thickness design, the thickness of the curtain is equal with the thickness of the coat.
  3. 3. 3D printing method as claimed in claim 1, it is characterised in that further include makes the curtain reach steady before coating The step of determining state, specifically before coating, after the liquid outlet goes out liquid, by the curtain applicator with non-steady state Accelerating running pre-determined distance, until the curtain from liquid outlet extrusion reaches stable state.
  4. 4. a kind of 3D printing equipment, it is characterised in that including moulding cylinder, light source, liquid storage container and curtain applicator；The shaping The support component of cylinder is Liftable type structure；The light source and the curtain applicator are located at the top of the moulding cylinder；It is described Curtain applicator has inlet and liquid outlet and is internally provided with balanced with the pressure of the inlet and liquid outlet connection The distance between curing plane of groove, the liquid outlet and the moulding cylinder is less than 50mm；The liquid storage container and the curtain Connected between the inlet of applicator by liquid-transport pipe-line.
  5. 5. 3D printing equipment as claimed in claim 4, it is characterised in that the curtain applicator includes the first coating head and the Two coating heads；Being equipped with first pressure groove in the first coating head, the second coating head is interior to be equipped with second pressure groove, and described the One coating head be fixedly connected with the described second coating head and first pressure groove and the second pressure groove corresponding matching composition described in It is balanced with the pressure is connected between the bottom of pressure equalizing tank, the bottom of the first coating head and the described second coating head The gap of groove, the gap form the liquid outlet；
    The inlet is located on the first coating head, and the quantity of the inlet is at least one, if the inlet Have it is multiple, multiple inlets described first coating head on be uniformly distributed, the distance between adjacent inlet is no more than 100mm。
  6. 6. 3D printing equipment as claimed in claim 5, it is characterised in that the first pressure groove and the second pressure groove are equal For semi-cylindrical groove, the first pressure groove coordinates the pressure equalizing tank for forming cylinder with the second pressure groove.
  7. 7. 3D printing equipment as claimed in claim 6, it is characterised in that the curtain applicator further includes inner lining plate, described Inner lining plate is located between the first coating head and the second coating head, to adjust the bottom of the first coating head and institute State the width in the gap between the bottom of the second coating head.
  8. 8. 3D printing equipment as claimed in claim 7, it is characterised in that the first coating head, the inner lining plate and described It is fixedly connected between second coating head by multiple screws being placed equidistant with, is apart no more than 50mm between adjacent screw, and The distance between the screw position and the pressure equalizing tank are no more than 10mm.
  9. 9. the 3D printing equipment as any one of claim 6~8, it is characterised in that the internal diameter of the pressure equalizing tank For 5~7mm.
CN201610393197.9A 2016-06-02 2016-06-02 3D printing device and method Expired - Fee Related CN106079435B (en)

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EP3418033B1 (en) * 2017-06-19 2020-01-01 Cubicure GmbH Method and device for lithography-based generative production of three-dimensional forms
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