CN105252775A - Stereoscopic model forming equipment and forming method using same - Google Patents
Stereoscopic model forming equipment and forming method using same Download PDFInfo
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- CN105252775A CN105252775A CN201510799531.6A CN201510799531A CN105252775A CN 105252775 A CN105252775 A CN 105252775A CN 201510799531 A CN201510799531 A CN 201510799531A CN 105252775 A CN105252775 A CN 105252775A
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Abstract
The invention relates to the technical field of model forming, in particular to stereoscopic model forming equipment and a forming method using the same. The stereoscopic model forming equipment comprises a rack provided with a working table. The working table is provided with a photocuring liquid container with an upward opening. A forming platform connected with a lifting rod is arranged in a barrel-shaped structure. The lifting rod is connected with a driving device. The forming platform is provided with a liquid laying device which moves back and forth on a guide rail. The liquid laying device is connected with a horizontal driving device and provided with an atomization device. The atomization device is provided with a photocuring liquid inlet and comprises an atomization nozzle connected with the photocuring liquid inlet. The atomization nozzle is arranged in a liquid laying shell. A curing light projection device is arranged on the rack and located above the forming platform. The rack is provided with a liquid level position detection device located above the forming platform. The stereoscopic model forming equipment has small disturbance in the photocuring liquid container, reduces dependence on a supporting structure in the forming process, and is suitable for photocuring forming of flexible bodies.
Description
Technical field
The present invention relates to mold curing field shaping technique, be specifically related to a kind of three-dimensional model former and forming method thereof.
Background technology
The forming method of three-dimensional model has a variety of, wherein can provide higher forming accuracy and good profiled surface flatness by the method (SLA) of ultraviolet curing light-cured resin.Chinese patent CN203665945U discloses a kind of based on DLP projection photocurable three-dimensional printer, comprise computer system, automatic control system, DLP optical projection system, shaping work pond, feeding system and jacking system, high-precision continuous light curing molding can be realized.Chinese patent CN201410795471.6 discloses a kind ofly to be had the laser 3D printer that strikes off function and photocuring Method of printing thereof and discloses and a kind ofly have the laser 3D printer striking off function, comprise the housing unit for forming abridged edition skeleton, for holding the hopper printing stoste, the print unit of described hopper working position can be positioned at described housing unit relative longitudinal motion, for providing the illumination unit of photocuring LASER Light Source, for striking off striking off unit and controlling the control unit of each cell operation state of process to printing surface between described print unit and described illumination unit, the described unit that strikes off can lengthwise movement, and the strike-off stick that it is arranged can horizontal cross motion in hopper, and completes scraper action and smoothing action in moving back and forth at one simultaneously.Chinese patent CN201410027198 discloses a kind of based on DLP principle and the 3D printer projected below liquid resin, and it is provided with resin storage tank, the base plate light-permeable of described resin storage tank; Vertical lifting mechanism is fixedly connected with shaping platform, adjusts the distance between resin storage tank and shaped platform by vertical lifting mechanism; Computer is divided into for the treatment of threedimensional model and by threedimensional model order has certain thickness some profile graphics, computer is connection control electrical control gear also, electrical control gear controls vertical lifting mechanism automatic lifting shaped platform, and control DLP projector irradiates light-cured resin liquid level in resin storage tank; DLP projector is located at the below of resin storage tank and is connected with computer, DLP projector by the figure light path of profile graphics through the base plate transmission of resin storage tank to irradiate photocurable liquid resin.
The solid portion realizing having solidified in forming process of prior art or uncured liquid part all can be subject to disturbance in various degree.Chinese patent CN203665945U discloses and will supplement light-cured resin from feeding system to shaping work pond often having solidified one deck, and uncured liquid part will produce flowing; The solid portion solidified and the uncured liquid part that strike off the enough lengthwise movement effects on surfaces of unit in Chinese patent CN201410795471.6 cause disturbance; The part that Chinese patent CN201410027198 has solidified and resin storage tank depart from and liquid resin flows to add between cured portion and tray bottom surface all produces disturbance.This disturbance makes to need during the overhanging portion of three-dimensional model additionally to increase supporting construction, otherwise under the effect of disturbance, dislocation and modification can occur overhanging portion in forming process.Need supporting construction to remove after forming process completes, so increase treatment process; Two carry out supporting construction needs and three-dimensional model surface contact, to complete support, affects the flatness on three-dimensional model surface after removing.In addition, when the forming process of three-dimensional model produces flexible body, this disturbance can affect formed precision.
Summary of the invention
In order to overcome defect of the prior art, the present invention, by a kind of photocuring three-dimensional model former of low disturbance and forming method, decreases the demand to supporting construction in three-dimensional model forming process, and the three-dimensional model being applicable to flexible body is further shaping.
The present invention is achieved through the following technical solutions: a kind of three-dimensional model former, comprise the frame being provided with workbench, described workbench is provided with tubular construction and the photocuring liquid container of opening upwards, the shaped platform being connected with elevating lever and carrying out moving up and down is provided with in described tubular construction, sealing ring is provided with between described tubular construction inwall and described shaped platform, described elevating lever is connected with the drive unit be arranged in frame, the top of described shaped platform is provided with the paving liquid device carrying out back and forth movement on guide rail, described paving liquid device is connected with the horizontal drive apparatus be arranged in frame, described paving liquid device is provided with paving liquid housing and atomising device, described atomising device is provided with the photocuring liquid entrance be connected with photocuring liquid supplying device, described atomising device comprises the atomizer be connected with described photocuring liquid entrance, described atomizer is arranged in described paving liquid housing, described frame is positioned at above described shaped platform and is provided with solidification light projecting apparatus, described frame is positioned at above described shaped platform and is provided with liquid level positional detecting device.
Further, described paving liquid housing bottom is provided with balanced baffle plate, described balanced baffle plate is provided with the equalizing tank of opening, the working motion direction of described equalizing tank is width, in the plane of movement of described equalizing tank, the direction vertical with described width is length direction, and on the described length direction of described equalizing tank within the scope of active length, the relative mean square error of the constant volume score value along the atomized drop density in the described equalizing tank opening of described width that each point is corresponding is no more than 10%.
Further, described balanced baffle plate is be the low arc mechanism of middle high surrounding relative to shaped platform, and the local lowest part of the junction of described balanced baffle plate and described paving liquid housing sidewall is provided with at least one outage.
Further, described workbench is provided with photocuring liquid accumulator tank, and described photocuring liquid accumulator tank bottom is provided with photocuring liquid retracting device.
Further, described atomising device comprises one or more of fluid injector, air ultrasound nozzle or low-frequency ultrasonic waves shower nozzle.
Further, described solidification light projecting apparatus is face projection arrangement or light-beam scanner.
Further, described atomising device there is heater.
Further, described photocuring liquid container outside is provided with cooling device.
Present invention also offers a kind of forming method using three-dimensional model former of the present invention, comprise the following steps:
Step 1) by computer, three-dimensional model is done slicing delamination according to presetting thickness, several obtaining three-dimensional model have the stacked shaping figure of two-dimensional shapes;
Step 2) shaped platform bottom photocuring liquid container is moved to delivery altitude position, use the described atomising device of described paving liquid device that photocuring liquid is atomized into drop or fine drop, described paving liquid device does horizontal movement along described guide rail above described shaped platform makes described fine drop on shaped platform, be laid to ground floor photocuring liquid;
Step 3) use liquid level sniffer to measure the height and position of current photocuring liquid level, the described shaped platform that declines makes the liquid level of ground floor consolidation liquid be in described delivery altitude position, according to step 1) in the shaping figure of ground floor that obtains, use solidification light projecting apparatus projection solidification light curing schedule 2) the middle ground floor photocuring liquid laid, the part of solidification forms ground floor mould shapes;
Step 4) on the liquid level of last layer photocuring liquid carrying out overcuring, photocuring liquid is atomized into fine drop by the described atomising device reusing described paving liquid device, and described paving liquid device does horizontal movement along described guide rail above described shaped platform makes described fine drop be laid to lower one deck photocuring liquid;
Step 5) use liquid level sniffer to measure described lower one deck photocuring liquid level position, the described shaped platform that declines makes the liquid level of lower one deck photocuring liquid be in delivery altitude position, according to step 1) in next formable layer figure of obtaining, solidification light projecting apparatus projection solidification light is used to solidify described step 4) the middle lower one deck photocuring liquid laid, the part of solidification forms next layer model shape, and the solidification light of described solidification light projecting apparatus projection q.s, makes the lap of adjacent two formable layer figures up and down be cured in together;
Step 6) repeated several times step 4) and step 5), until the three-dimensional model of 3D solid is shaping.
Further, described forming method also comprises, and uses laser by galvanometer or mobile mirror scan light consolidation liquid surface, by the high temperature produced, photocuring liquid-solidization is obtained the step of three-dimensional model shape.
Of the present invention being provided with is atomized and spreads the three-dimensional model former of liquid device compared with prior art, superior effect is: the disturbance of paving liquid device to photocuring liquid container in the present invention is little, reduce forming process to the dependence of supporting construction, be applicable to the Stereolithography advantage of flexible body.
Accompanying drawing explanation
Fig. 1 is the three-dimensional structure diagram of three-dimensional model former of the present invention;
Fig. 2 is the front view of the structure for amplifying of Fig. 1 middle berth liquid device;
Fig. 3 is A-A internally structure sectional view in Fig. 2;
Fig. 4 is the three-dimensional structure diagram of Fig. 1 middle berth liquid device;
Fig. 5 is the elevated bottom perspective structure chart of Fig. 1 middle berth liquid device;
Fig. 6 is that fine drop that in Fig. 1, atomising device produces is at the high unimodal drop density distribution curve schematic diagram of working face center density;
Fig. 7 projects to the schematic diagram of consolidation liquid upper surface for the opening of equalizing tank described in the present invention.
Reference numeral is as follows:
1-photocuring liquid container, 2-workbench, 3-spreads liquid housing, 4-linear bearing, 5-atomising device, 6-photocuring liquid entrance, 7-light sensor, 8-crossbeam, 9-solidifies light projecting apparatus, 10-photophore, 11-side plate, 12-guide rail, 13-worm screw, 14-belt, 15-photocuring liquid accumulator tank, 16-shaped platform, 17-power transmission shaft, 18-base plate, 19-drive unit, 20-elevating lever, 21-frame, 23-atomizer, 24-PZT (piezoelectric transducer), 25-equalizing tank, the balanced baffle plate of 26-, 27-outage.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the invention is described in further detail.
Embodiment 1
As shown in figs. 1 and 4, illustrate a kind of three-dimensional model former provided by the invention, described former comprises the frame 21 of control device and U-shaped structure, crossbeam 8 is provided with between two side plates 11 of described U-shaped structure, the bottom of described crossbeam 8 is provided with workbench 2 in frame 21 centre position, described workbench 2 is embedded with tubular construction and the photocuring liquid container 1 of opening upwards, the shaped platform 16 being connected with elevating lever 20 and carrying out moving up and down is provided with in described tubular construction, sealing ring (not drawing in figure) is provided with between described tubular construction inwall and described shaped platform 16, make photocuring liquid can not seepage, also do not affect moving up and down of shaped platform 16 simultaneously, described elevating lever 20 is connected with the drive unit 19 be arranged on base plate 18, the top of described shaped platform 16 is provided with the paving liquid device carrying out back and forth movement on guide rail 12, described paving liquid device is connected with the horizontal drive apparatus be arranged in frame, described paving liquid device comprises paving liquid housing 3 and atomising device 5, described atomising device 5 is provided with and the photocuring liquid entrance 6 supplying consolidation liquid device and be connected, described atomising device 5 comprises the atomizer 23 be connected with described photocuring liquid entrance 6, described atomizer 23 is arranged in described paving liquid housing 3, the top of described frame 21 is provided with crossbeam 8, described crossbeam 8 is provided with the solidification light projecting apparatus 9 corresponding with shaped platform 16 position, two side plates 11 of described frame 21 are respectively equipped with the light sensor 7 of liquid level sniffer and the photophore 10 of liquid detection device, described workbench 2 is provided with photocuring liquid accumulator tank 15, the paving liquid housing 3 of described paving liquid device is connected with worm screw 13, described worm screw 13 is connected with the conveyer belt 14 on power transmission shaft 17, described power transmission shaft 17 is connected with drive unit 19.In the present embodiment, described atomising device 5 is preferably arranged heater (not drawing in figure) and described photocuring liquid container 1 outer setting cooling device (not drawing in figure).As shown in Figure 5, paving liquid housing 3 in described paving liquid device is rectangular configuration, two sidewalls of described paving liquid housing 3 are respectively equipped with the linear bearing 4 be sleeved on guide rail 12, the bottom of described paving liquid housing 3 be provided with shaped platform 16 with the use of and the balanced baffle plate 26 of the arc low in center high surrounding relative to shaped platform 16, the balanced baffle plate 26 of described arc is provided with opening equalizing tank 25, and described balanced baffle plate 26 is provided with at least one outage 27 with the local lowest part of the junction of described paving liquid housing 3 sidewall.In the present embodiment, described atomising device 5 is piezoelectric ultrasonic atomization device preferably, and described piezoelectric ultrasonic atomization device comprises the PZT (piezoelectric transducer) 24 being arranged on nozzle 23 top.
Embodiment 2
Present invention also offers a kind of use and be provided with atomization and the forming method of the three-dimensional model former of paving liquid device, comprise the following steps:
Step 1) by computer, three-dimensional model is done slicing delamination according to presetting thickness, several obtaining three-dimensional model have the stacked shaping figure of two-dimensional shapes;
Step 2) shaped platform 16 bottom photocuring liquid container 1 is moved to delivery altitude position, described delivery altitude position is the height and position that solidification optical projection device 9 realizes the focusing of solidification light, use the atomizer 23 in the described atomising device 5 of described paving liquid device that photocuring liquid is atomized into fine drop, described paving liquid device does horizontal movement along described guide rail 12 above described shaped platform 16 makes described fine drop on shaped platform 16, be laid to ground floor photocuring liquid;
Step 3) use liquid level sniffer to measure the height and position of current photocuring liquid level, by the liquid detection device be arranged in frame 21 photophore 10 to photocuring liquid level from the side angle send probing light, this probing light is reflected at photocuring liquid level, light sensor 7 through being arranged on the liquid detection device in frame 21 receives, thus the height of detection photocuring liquid; The described shaped platform 16 that declines makes the liquid level of ground floor consolidation liquid be in described delivery altitude position, according to step 1) in the shaping figure of ground floor that obtains, solidification light projecting apparatus 9 is used to project solidification light curing schedule 2) the middle ground floor photocuring liquid laid, the part of solidification forms ground floor mould shapes;
Step 4) on the liquid level of last layer photocuring liquid carrying out overcuring, photocuring liquid is atomized into fine drop by the atomizer 23 reused in the atomising device 5 of described paving liquid device, and described paving liquid device does horizontal movement along described guide rail above described shaped platform makes described fine drop be laid to lower one deck photocuring liquid;
Step 5) use liquid detection device to measure described lower one deck photocuring liquid level position, decline described shaped platform 16, the liquid level of lower one deck consolidation liquid is made to be in delivery altitude position, according to step 1) in next formable layer figure of obtaining, use solidification light projecting apparatus 9 to project solidification light and solidify described step 4) the middle lower one deck photocuring liquid laid, the part of solidification forms next layer model shape, and described solidification light projecting apparatus 9 projects the solidification light of q.s, the lap of adjacent two formable layer figures is up and down made to be cured in together;
Step 6) repeated several times step 4) and step 5), complete until the three-dimensional model of 3D solid is shaping.
In the present embodiment, described forming method also comprises, and uses laser by galvanometer or mobile mirror scan light consolidation liquid surface, by the high temperature produced, optical solidified liquid is solidified the step obtaining three-dimensional model shape.
Three-dimensional model former provided by the invention, concrete operation principle is as described below, more can set forth clear invention intention of the present invention, the bottom of the photocuring liquid container 1 in the present invention and shaped platform 16 liftable and opening upwards and can move horizontally along guide rail 12, and the paving liquid device of photocuring liquid is laid at photocuring liquid container 1 upper surface, the photophore 10 of liquid detection device and the light sensor 7 of face sniffer measure the liquid level position of photocuring liquid, solidification light is projected the solidification light projecting apparatus 9 of photocuring liquid upper surface by molding shape, the bottom of photocuring liquid container 1 is driven to move up and down and drive the drive unit of described paving liquid device horizontal movement, atomising device 5 in described paving liquid device and bottom are provided with the paving liquid housing 3 of the balanced baffle plate 26 of drop, paving liquid housing 3 is equipped with two linear bearings 4, linear bearing 4 linearly guide rail 12 slides in photocuring liquid container 1 upper horizontal.Photocuring liquid is by photocuring liquid supplying device, such as peristaltic pump, atomising device 5 is entered by photocuring liquid entrance 6, can adopt atomization of liquid shower nozzle in atomising device 5, the atomizer that preferred diameter is less than 1 millimeter, this shower nozzle makes optical solidified liquid spray through tiny nozzle at a high speed, discrete motion on the one hand due to liquid self after ejection, on the one hand due to air effect, make liquid become fine drop, reach the effect of atomization.The another kind of implementation using atomising device 5 to carry out being atomized adopts pneumatic ultrasonic atomization shower nozzle, this ultrasonic atomization shower nozzle drives liquid by compressed air, and the concussion of ultrasonic wave air-flow is produced at nozzle place, make liquid be atomized into fine drop by ultrasonic impact.In the present embodiment, although adopt two kinds of atomising devices to may be used for equipment of the present invention, consider from the angle of precise forming, also preferably adopt the another kind of supersonic atomizer containing PZT (piezoelectric transducer) 24, i.e. piezoelectric ultrasonic atomization device, also referred to as low-frequency ultrasonic waves shower nozzle, nozzle 23 top of this low-frequency ultrasonic waves shower nozzle is provided with PZT (piezoelectric transducer) 24, also referred to as piezoelectric ceramic piece, produce the supersonic oscillations of certain resonant frequency between 20kHz to 200kHz, and make the supersonic oscillations amplitude at atomizer 23 place maximum by ultrasonic transformer, the surface energy that the supersonic oscillations at this atomizer 23 place make the fine drop of liquid can depart from liquid realizes atomization, the diameter of this fine drop is usually between several microns to hundreds of micron.The fine drop self of the photocuring liquid that the atomization of piezoelectric ultrasonic atomization device produces has very little kinetic energy, is decline according to freely falling body, (when not considering air drag).Although, further can suitably by applying electric field or air-flow, the motion of these fine drop is made to have more directionality (not shown), but, when the fine drop of this little kinetic energy falls into described photocuring liquid container 1, almost mechanical shock is not had to model entity in type in photocuring liquid container 1, obvious disturbance is not produced to the liquid in photocuring container 1 yet.This there is no the condition of active force disturbance under, the solid of molded solidification and the liquid of non-forming and hardening are all static, within the scope of certain hour, namely in this time range, other disturb the displacement of the solid of the molded solidification caused to be less than the design formed precision of this invention equipment, this time range depends on many factors, such as, the viscosity of photocuring liquid, even if the three-dimensional models such as the shape of the solid of molded solidification have the solid of hanging structure or molded solidification to be flexible body, do not need to support.In practical application, due to external shock interference and thermal convection current, preferably use a small amount of supporting construction for long hanging structure, nonetheless, this supporting construction, because stressed little, also can simplify significantly.As shown in Figure 5, because balanced baffle plate 26 will block some fine drop in the present embodiment, middle part bottom balanced baffle plate 26 is higher than surrounding, and spread liquid shell 3 local lowest part and have outage 27, preferred outage 27 is 4 or 6, like this, the fine drop be blocked flows out from outage 27 after can converging.Simultaneously, as shown in Figure 1, the periphery installing photocuring liquid container 1 at the workbench 2 of frame 21 is provided with photocuring liquid accumulator tank 15, during that flow out through outage 27 and paving liquid device paving liquid, the photocuring liquid trickled down outside photocuring liquid container 1 is flowed out by photocuring liquid accumulator tank 15, and photocuring liquid is arranged on retracting device below photocuring liquid accumulator tank 15 and collects (not drawing in figure) and carry out recycling.The viscosity of piezoelectric ultrasonic atomization device to aerosolizable photocuring liquid there are certain requirements, usually 50 centipoises (cP) are no more than, also preferred in the present embodiment heater is set on described atomising device 5, adopts the way of raised temperature, reduce the viscosity of photocuring liquid.The viscosity improving the photocuring liquid in photocuring liquid container is conducive to shaping the stablizing of three-dimensional model, further, in photocuring liquid container 1 outside by installing cooling device, be used for reducing the temperature of its interior lights consolidation liquid, thus reduce the viscosity of photocuring liquid in container.Photocuring liquid can adopt the liquid of photosensitive resin, photo-sensitive hydrogel or other photo-curing.In addition, the scheme that can realize this invention with photo-thermal curing is also adopted.Such as, with carbon dioxide laser by galvanometer or mobile mirror scan light consolidation liquid surface, photocuring liquid-solidization is made by the high temperature produced.Wherein grenade instrumentation 9 is not limited only to laser scanning device, can also use face projection arrangement, such as, adopts the ultraviolet light projection arrangement of DLP technology.Because the shaped platform 16 of paving liquid device on photocuring liquid container 1 lays very thin photocuring liquid, thickness is for being less than 100um, and the actual height measuring photocuring liquid liquid level can improve formed precision.In the present embodiment, liquid detection device selects optical reflection type sniffer, form according to the photophore 10 of photocuring liquid level and the light sensor 7 of reception liquid level reflect detection light by by probing light, photophore 10 adopts small-power infrared laser, and light sensor 7 selects linear CCD or cmos image sensor part.
In the present invention, equalizing tank 25 operation principle is as described below: for specific consolidation liquid, the atomized drop density that atomising device 5 produces can be expressed as three element complex, i.e. d (x, y, z), wherein x, y are the horizontal coordinates with atomizer vertical plane, z is the height of working face, and namely nozzle is to the distance of consolidation liquid upper surface.Because working depth is fixing, namely z=z0, z0 are the operating distance of nozzle to consolidation liquid upper surface, so the atomized drop density that described atomising device produces can be expressed as dz0 (x, y).Such as, the atomized drop density curve schematic diagram as y=0, as shown in Figure 6.The Density Distribution of fine drop on working face that atomising device 5 produces is uneven, that is these fine drop fall the density of photocuring liquid container 1 upper surface formation droplet distribution is uneven, directly spreads liquid with atomising device 5 and the photocuring liquid layer thickness of formation can be caused uneven.Illustrational is the unimodal drop density distribution curve that a kind of center density is high, and actual distribution also may be density profile that is bimodal or multimodal.In order to enable the paving liquid device of employing atomising device 5 at the uniform photocuring liquid of photocuring liquid container 1 upper surface laying depth, need to adjust its equivalent outlet size according to the density of droplet distribution, namely adjust described equalizing tank 25 A/F, on the balanced baffle plate 26 of drop, namely have the equalizing tank 25 of the opening of curve shape.As shown in Figure 7, to simplify the analysis, the opening of described equalizing tank 25 is projected to consolidation liquid upper surface in the z-direction, the working motion direction of described equalizing tank 25 is width, i.e. x direction; In the plane of movement of described equalizing tank 25, the direction vertical with described width is length direction, i.e. y direction, for the position y of any given length direction, the starting point that described equalizing tank 25 is slotted is expressed as x1 (y), and end point is expressed as x2 (y).During work, paving liquid housing 3, namely equalizing tank 25, do straight line uniform motion in the x-direction, certain y value position corresponding on working face, each position, x direction obtains the quantity of fine drop, namely x direction paving liquid thickness, is consistent, as shown in formula (1):
For making the thickness in operating fluid level y direction also be consistent, namely all directions thickness of whole plane is even, requires that described equalizing tank 25 is in active length scope, and as shown in Figure 7, each y value corresponding in y1 to y2, its A (y) is equal.So-called active length is exactly the length of the corresponding operating fluid level part of equalizing tank 25, when the length of equalizing tank 25 is greater than liquid level y direction size, only has middle one section to be active length.As the y1 to y2 of Fig. 7, for the part of equalizing tank 25 two ends not within the scope of active length, the shape being applicable to processing should be adopted so that processing; When working face y size is greater than equalizing tank length, be that is paved with liquid level when wanting fine scanning, whole equalizing tank 25 length is all active length.For making described equalizing tank 25 in active length scope, any y value in y1 to y2, its A (y) is equal, and can be obtained the theoretical value of equalizing tank 25 opening size by the method for multipass numerical computations, its concrete steps are:
1) atomized drop density d z0 (x, y) is obtained by measuring;
2) according to the size of paving liquid housing 3, x1 (y) and x2 (y) is initially set to the position at the edge of shell both sides, suitably retains safe distance so that processing;
3) for ease of calculating, setting speed is constant v=1, and interval at y direction y1 to y2, gets N number of y sampled point to calculate open curve, i.e. ys1, ys2, ys3 ... ysN;
4) first pass calculates, and makes y=ys1, ys2, ys3 ... ysN, calculates A (y) according to formula 1, and retains the minimum of a value Amin of A (y);
5) second compile scanning calculating, make y=ys1, ys2, ys3 ... ysN, and A (y)=Amin, numerical solution x1 and x2, obtains x1 (y) and the x2 (y) of N number of y sampled point; For ease of calculating and processing, setting x1 and x2 is symmetrical along y-axis, i.e. x1<0, x2>0 Bing Qie – x1=x2;
6) the theoretical shape of equalizing tank opening is determined by x1 (y) and x2 (y).
Calculate theoretically, what on described length (y) direction of described equalizing tank 25 within the scope of active length, each point was corresponding is constant along the value of the definite integral of the atomized drop density of (x1 to x2) in described equalizing tank 25 opening in described width (x) direction.Because the simplification process in theory analysis, the error of numerical computations, and atomized drop dropping process is non-linear, described equalizing tank 25 actual aperture width also needs to do final fine setting optimization according to actual measurement, and the mean square deviation that this fine setting is reflected on theory calculate is no more than 10% within the scope of active length.Corresponding described N number of y sampled point, fine setting after-opening width is x1t to x2t, so,
(2) in formula, i=1,2,3 ... N, its arithmetic mean of instantaneous value,
Mean square deviation,
In formula (5), this mean square deviation is less than 10%.
The present invention is not limited to above-mentioned embodiment, and when not deviating from flesh and blood of the present invention, any distortion that it may occur to persons skilled in the art that, improvement, replacement all fall into protection scope of the present invention.
Claims (10)
1. a three-dimensional model former, it is characterized in that, described former comprises the frame (21) being provided with workbench (2), described workbench (2) is provided with tubular construction and the photocuring liquid container (1) of opening upwards, the shaped platform (16) being connected with elevating lever (20) and carrying out moving up and down is provided with in described tubular construction, sealing ring is provided with between described tubular construction inwall and described shaped platform (16), described elevating lever (20) is connected with the drive unit (19) be arranged on base plate (18), the top of described shaped platform (16) is provided with the paving liquid device carrying out back and forth movement on guide rail (12), described paving liquid device is connected with the horizontal drive apparatus be arranged in frame, described paving liquid device is provided with paving liquid housing (3) and atomising device (5), described atomising device (5) is provided with and the photocuring liquid entrance (6) supplying photocuring liquid device and be connected, described atomising device (5) comprises the atomizer (23) be connected with described photocuring liquid entrance (6), described atomizer (23) is arranged in described paving liquid housing (3), described frame (21) is positioned at described shaped platform (16) top and is provided with solidification light projecting apparatus (9), described frame (21) is positioned at described shaped platform (16) top and is provided with liquid level positional detecting device.
2. three-dimensional model former according to claim 1, it is characterized in that, described paving liquid housing (3) bottom is provided with balanced baffle plate (26), described balanced baffle plate (26) is provided with the equalizing tank (25) of opening, the working motion direction of described equalizing tank (25) is width, in the plane of movement of described equalizing tank (25), the direction vertical with described width is length direction, on the described length direction of described equalizing tank (25) within the scope of active length, the relative mean square deviation of the constant volume score value along the atomized drop density in the described equalizing tank opening of described width that each point is corresponding is no more than 10%.
3. three-dimensional model former according to claim 2, it is characterized in that, described balanced baffle plate (26) is relative to shaped platform (16) arcuate structure low in middle high surrounding, and described balanced baffle plate (26) is provided with at least one outage (27) with the minimum position, local of the junction of described paving liquid housing (3) sidewall.
4. three-dimensional model former according to claim 1, it is characterized in that, described workbench (2) is provided with photocuring liquid accumulator tank (15), and described photocuring liquid accumulator tank (15) bottom is provided with photocuring liquid retracting device.
5. three-dimensional model former according to claim 1, is characterized in that, described atomising device (5) comprises one or more of fluid injector, air ultrasound nozzle or low-frequency ultrasonic waves shower nozzle.
6. three-dimensional model former according to claim 1, it is characterized in that, described solidification light projecting apparatus (9) is face projection arrangement or light-beam scanner.
7. three-dimensional model former according to claim 1, it is characterized in that, described photocuring liquid container (1) outside is provided with cooling device.
8. three-dimensional model former according to claim 1, it is characterized in that, (5) are provided with heater with described atomising device.
9. use a forming method for three-dimensional model former, it is characterized in that, described forming method comprises the following steps:
Step 1) by computer, three-dimensional model is done slicing delamination according to presetting thickness, several obtaining three-dimensional model have the stacked shaping figure of two-dimensional shapes;
Step 2) shaped platform (16) of photocuring liquid container (1) bottom is moved to delivery altitude position, use the atomising device (5) of described paving liquid device that photocuring liquid is atomized into drop or fine drop, described paving liquid device does horizontal movement along described guide rail (12) in described shaped platform (16) top makes described fine drop be laid to ground floor photocuring liquid on shaped platform (16);
Step 3) use liquid level sniffer to measure the height and position of current photocuring liquid level, the described shaped platform (16) that declines makes the liquid level of ground floor consolidation liquid be in described delivery altitude position, according to step 1) in the shaping figure of ground floor that obtains, use solidification light projecting apparatus (9) projection solidification light curing schedule 2) the middle ground floor photocuring liquid laid, the part of solidification forms ground floor mould shapes;
Step 4) on the liquid level of last layer photocuring liquid carrying out overcuring, photocuring liquid is atomized into fine drop by the described atomising device (5) reusing described paving liquid device, and described paving liquid device does horizontal movement along described guide rail (12) in described shaped platform (16) top makes described fine drop be laid to lower one deck photocuring liquid;
Step 5) use liquid level sniffer to measure described lower one deck photocuring liquid level position, the described shaped platform (16) that declines makes the liquid level of lower one deck photocuring liquid be in delivery altitude position, according to step 1) in next formable layer figure of obtaining, solidification light projecting apparatus projection solidification light is used to solidify described step 4) the middle lower one deck photocuring liquid laid, the part of solidification forms next layer model shape, and the solidification light of described solidification light projecting apparatus (9) projection q.s, the lap of the two formable layer figures up and down of adjacent two layers is made to be cured in together,
Step 6) repeated several times step 4) to step 5), the three-dimensional model obtaining 3D solid is shaping.
10. use the forming method of three-dimensional model former according to claim 9, be characterised in that, described forming method also comprises, and uses laser by galvanometer or mobile mirror scan light consolidation liquid surface, by the high temperature produced, light liquid-solidization is obtained the step of mould shapes.
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| CN110920053A (en) * | 2019-11-28 | 2020-03-27 | 深圳摩方新材科技有限公司 | Device and method for continuous 3D printing by adopting ultrasonic atomization coating |
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