CN101332649B - Light-cured quick forming device and method based on reflection-type liquid crystal light valve - Google Patents
Light-cured quick forming device and method based on reflection-type liquid crystal light valve Download PDFInfo
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- CN101332649B CN101332649B CN200810150338XA CN200810150338A CN101332649B CN 101332649 B CN101332649 B CN 101332649B CN 200810150338X A CN200810150338X A CN 200810150338XA CN 200810150338 A CN200810150338 A CN 200810150338A CN 101332649 B CN101332649 B CN 101332649B
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Abstract
The invention discloses a light-cured quick forming device on the basis of a reflection-typed liquid crystal light valve, comprising a computer which is respectively connected with an image generator and a peristaltic pump; the peristaltic pump is communicated with a resin trough; the resin trough is internally provided with a lifting workbench which moves along the internal wall; the image generator is arranged above the lifting workbench. The method which uses the device for quickly forming the part comprises the steps as follows: 3D model of the part required to be formed is divided as layers by the computer; each sub-layer section data is gained; furthermore, the data is sent to the image generator; the image generator generates the optical digital views of each sub-layer section of the part according to the received data; furthermore, the optical digital view is projected to liquid photosensitive resin layer which is exposed and solidified, thus forming the light-cured resin layer of the current section of the part; the steps are repeated till the forming of the part is completed. The method of the invention has the advantages of low cost, high precision, high forming efficiency, simple process, etc.
Description
Technical field
The invention belongs to optical stereo moulding manufacturing technology field, relate to a kind of photocuring moulding device, be specifically related to a kind of light solidifying quick forming device, the invention still further relates to and utilize this device to carry out the method for part photocuring moulding based on reflection-type liquid crystal light valve.
Background technology
The rapid shaping technique of part is to utilize the material forming principle that adds up, and according to the three-dimensional CAD model of required forming part, directly produces a kind of advanced person's of this entity component manufacturing technology.
The quick molding method of using mainly contains photocuring method (Stereolithography), layered manner (LOM), sintering process (SLS), fusing process of intermediate (FDM) and 3D print process (3D-Printer) etc. at present.
The photocuring method utilizes photosensitive resin by Ultra-Violet Laser irradiation back curing principle to be taken place, and carries out the material moulding that adds up, and has characteristics such as formed precision height, surface smoothness are good, stock utilization height, can be used for making the part with hollow and fine structure.
Tradition photocuring method is after laser beam is focused on, to utilize scanning system liquid towards resin to carry out vector scan, is bonded to scanning plane by scan line, finishes the curing molding of part section.But owing to use laser instrument and precise light beam scanning system, cause cost of manufacture height, curing efficiency low.
For reducing cost of manufacture, improving curing efficiency, developed the rapid shaping technique of utilizing mask that the whole aspect of part section view is exposed and solidified.This technology have the whole layer time for exposure short, shaping speed is fast, shaping efficiency is high, can use non-laser light source, advantage that system cost is low.
Text " optical stereo formative method and device " (application number 03120183.0, publication number CN1443636, an open day 2003.09.24) has proposed a kind of shaped device that is applied in method that mask realizes rapid shaping and this method that utilizes.Adopt liquid crystal baffle plate (LCD) or digital micro-mirror baffle plate (DMD) to be arranged to the planar drawing mask of two dimension in its device, can change mask image with the mobile phase interlock of this mask that charts by supplying with the mask that charts in light and early stage, thus, on the surface of light curing resin composition in early stage, form photocurable layers in early stage with predetermined section configuration.
Text " adopting the quick molding method of shadow casting technique " (application number 200410009731.9, publication number CN1769032, open day 2006.05.10), disclosed a kind of quick molding method that adopts shadow casting technique, utilization comprises the projector of LCD pattern and DMD pattern, and the graphics digital signal with one group of object model two dimension slicing information obtaining is converted into optical signalling, shine directly into the liquid level of photosensitive resin then with static graphics, make its curing.
" digital projection photocurable rapid shaping apparatus and method " (application number 200610042853.7, publication number CN1850494, open day 2006.10.25), disclose a kind of digital projection photocurable rapid shaping apparatus and used this device to carry out the method for photocureable rapid shaping.This device adopt digital projector (Digital Light Processing DLP) accepts pictorial data from computer, and according to the Exposure mode of setting with graphic projection to resin surface, produce and solidify.
In the disclosed device of above-mentioned prior art, the projector of use or projecting apparatus all adopt liquid crystal baffle plate LCD and digital micro-mirror baffle plate DMD, and resolution ratio is lower.
Summary of the invention
The purpose of this invention is to provide a kind of light solidifying quick forming device, not only have higher resolution ratio, and cost is low, efficient is high based on reflection-type liquid crystal light valve.
Another object of the present invention provides the method for utilizing said apparatus to carry out the moulding of part photocuring.
The technical solution adopted in the present invention is, a kind of light solidifying quick forming device based on reflection-type liquid crystal light valve, comprise computer, computer links to each other with peristaltic pump with pattern generator respectively, peristaltic pump communicates with resin storage tank, be provided with self-powered platform in the resin storage tank, self-powered platform can move along the inwall of resin storage tank, and pattern generator is positioned at the top of self-powered platform.
Another technical scheme of the present invention is, a kind of method of utilizing said apparatus to carry out quick photocuring moulding is carried out according to the following steps:
Step 1: adopt computer that the 3D model layering of required forming part is handled, obtain each layering cross-section data of part model, and these data are sent to the pattern generator that links to each other with computer;
Step 2: the self-powered platform that adopts computer control to be arranged in the resin storage tank descends, simultaneously, utilize the computer control peristaltic pump, by peristaltic pump liquid photosensitive resin is delivered to the upper surface of the self-powered platform that communicates with it by pipeline, forms the certain thickness liquid photosensitive resin layer of one deck on the surface of self-powered platform;
Step 3: the cross-section data of the part model that pattern generator provides according to computer, generate the optical digital view of part each minute layer cross section, and this optical digital view is projected the liquid photosensitive resin layer of the laying of the self-powered platform upper surface that is positioned at pattern generator below, the curing that exposes of liquid towards photosensitive resin forms the light-cured resin layer of part when the starting section;
Step 4: the distance that is arranged at the thickness of the self-powered platform decline one deck liquid photosensitive resin layer in the resin storage tank;
Step 5: peristaltic pump is given and to be positioned at the resin layer surface that the part made on the self-powered platform solidified and to lay the new liquid photosensitive resin layer of one deck, and guarantees that the thickness of this liquid photosensitive resin layer is even, surfacing;
Step 6: repeating step 3 is solidified on photosensitive resin until computer (2) all branch layer cross sections to the need forming part to step 5, promptly finishes the photocureable rapid shaping of whole part (6).
The invention has the beneficial effects as follows and adopted reflection-type liquid crystal light valve LCoS in the pattern generator, improved the resolution ratio of light solidifying quick forming device, have that cost is low, precision is high, shaping efficiency is high, advantage of simple technology, be widely used in the manufacturing of part in the fields such as machinery, instrument and meter, automobile, space flight and aviation, medical engineering.
Description of drawings
Fig. 1 is the structural representation of apparatus of the present invention;
Fig. 2 is the structural representation of pattern generator in apparatus of the present invention.
Among the figure, 1. pattern generator, 2. computer, 3. peristaltic pump, 4. resin storage tank, 5. self-powered platform, 6. part, 7. liquid photosensitive resin layer.
Wherein, 1-1. light source, 1-2. reflector, 1-3. diaphragm, 1-4. collimation lens, 1-5. optical filtering, 1-6. polarization conversion system PCS, 1-7. light uniforming device, 1-8. reflection-type liquid crystal light valve LCoS, 1-9. polarization beam apparatus PBS, 1-10. plus lens, 1-11. view imaging surface.
The specific embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
The structure of shaped device of the present invention, as shown in Figure 1.Comprise computer 2, computer 2 links to each other with peristaltic pump 3 with pattern generator 1 respectively, peristaltic pump 3 communicates with resin storage tank 4, be provided with self-powered platform 5 in the resin storage tank 4, pattern generator 1 is positioned at the top of self-powered platform 5, between the upper surface of pattern generator 1 and self-powered platform 5, in the resin storage tank 4 by peristaltic pump 3 input one deck liquid photosensitive resin layers 7.
The structure of pattern generator 1 in apparatus of the present invention, as shown in Figure 2.Along same axis, be disposed with light source 1-1, diaphragm 1-3, collimation lens 1-4, optical filtering 1-5, polarization conversion system PCS 1-6, light uniforming device 1-7 and polarization beam apparatus PBS 1-9, the top of polarization beam apparatus PBS 1-9 is provided with reflection-type liquid crystal light valve LCoS 1-8, the below of polarization beam apparatus PBS 1-9 is provided with plus lens 1-10, and plus lens 1-10 is positioned at the top of the liquid resin 7 of resin storage tank 4 addings.The outer periphery of light source 1-1 is equipped with reflector 1-2, and the opening of reflector 1-2 is towards diaphragm 1-3, and diaphragm 1-3 is positioned at the picture point place that reflector 1-2 reflection source light beam forms.
Photocuring moulding flow process of the present invention, carry out according to the following steps:
Step 1: adopt computer 2 that the 3D model of required forming part 6 is carried out the layering processing, obtain the cross-section data of part 6 each layering of model, and this cross-section data is sent to the pattern generator 1 that links to each other with computer 2;
Step 2: the self-powered platform 5 that adopts computer 2 controls to be arranged in the resin storage tank 4 descends, simultaneously, utilize computer 2 control peristaltic pumps 3, by peristaltic pump 3 liquid photosensitive resin is delivered to the upper surface of the self-powered platform 5 that communicates with it by pipeline, forms the certain thickness liquid photosensitive resin layer 7 of one deck on the surface of self-powered platform 5;
Step 3: the cross-section data of part 6 models that pattern generator 1 provides according to computer 2, generate the optical digital view of part 6 each minute layer cross section, and this optical digital view is projected the liquid photosensitive resin layer 7 of the laying of self-powered platform 5 upper surfaces that are positioned at pattern generator 1 below, liquid towards photosensitive resin 7 curing that exposes forms the light-cured resin layer of part 6 when the starting section;
Step 4: the distance that is arranged at the thickness of the self-powered platform 5 decline one deck liquid photosensitive resin layers 7 in the resin storage tank 4;
Step 5: peristaltic pump 3 is given to be positioned at and is shown on the self-powered platform 5 that the resin layer surface that the part 6 made has solidified lays the new liquid photosensitive resin layer 7 of one deck, and guarantees that the thickness of this liquid photosensitive resin layer 7 is even, surfacing;
Step 6: repeating step 3 needs all branch layer cross sections of forming part 6 to be solidified on photosensitive resin to step 5 until 2 pairs in computer, promptly finishes the photocureable rapid shaping of whole part 6.
The operation principle of pattern generator 1:
The light beam that light source 1-1 sends is behind reflector 1-2 reflecting and collecting, the picture point that forms light source converges at diaphragm 1-3, diaphragm 1-3 with the part veiling glare filtering in the light beam after, light beam forms directional light through collimation lens 1-4, this directional light is by behind the unwanted spectrum line of optical filtering 1-5 filtering, enter polarization conversion system PCS 1-6, polarization conversion system PCS 1-6 is converted into the S polarised light with same polarization state with the light beam of incident, to improve the efficiency of light energy utilization of system.
In order to guarantee that light distribution is even in the view imaging surface, the rear end of polarization conversion system PCS 1-6 is provided with light uniforming device 1-7, so that reflection-type liquid crystal light valve LCoS 1-8 obtains full and uniform illumination.
The isolated S polarised light of polarization conversion system PCS 1-6 reflexes to reflection-type liquid crystal light valve LCoS 1-8 through polarization beam apparatus PBS 1-9, then by after the reflection-type liquid crystal light valve LCoS 1-8 modulation reflection, make in the S polarised light, have only P polarised light composition can pass through polarization beam apparatus PBS 1-9 once more, project on the plus lens 1-10, and on view imaging surface 1-11, form predetermined view.
Adopt reflection-type liquid crystal light valve LCoS 1-8 as display in the pattern generator 1 of apparatus of the present invention, the LCD pattern that adopts in itself and the prior art projector and the comparison of DMD mode display main performance, as shown in table 1.
Table 1
By finding out in the table:
1. the aperture ratio of reflection-type liquid crystal light valve LCoS is the highest, shows that reflection-type liquid crystal light valve LCoS is the highest to the utilization ratio of light source, can realize the highest brightness.If make up the view generator as core with reflection-type liquid crystal light valve LCoS, be used for rapid forming system, will have higher light exposure, the forming efficiency of forming speed and Geng Gao faster.
2. reflection-type liquid crystal light valve LCoS has minimum Pixel Dimensions and the highest resolution ratio, show that with reflection-type liquid crystal light valve LCoS be the rapid forming system that core makes up pattern generator, the minimum cell size of the micro-structure that can make is littler, helps improving making resolution ratio.And the resolution ratio of the DMD device that uses in the prior art is XGA (1024 * 768), and the price of more high-resolution DMD device is very expensive.
3. the contrast of reflection-type liquid crystal light valve LCoS is higher, makes with reflection-type liquid crystal light valve LCoS to be that the view light and shade that pattern generator the was produced contrast that makes up of core is more clear, and when being used for rapid forming system, the fine structure of making will be more clear.Simultaneously, reflection-type liquid crystal light valve LCoS has higher switching speed, with reflection-type liquid crystal light valve LCoS is the gray modulation of the easier realization Pixel-level of pattern generator of core, when being used for rapid forming system making fine structure, can control light exposure more accurately, be beneficial to the making and the precision control of micro-structure.
Claims (3)
1. light solidifying quick forming device based on reflection-type liquid crystal light valve, comprise computer (2), it is characterized in that, computer (2) links to each other with peristaltic pump (3) with pattern generator (1) respectively, peristaltic pump (3) communicates with resin storage tank (4), be provided with self-powered platform (5) in the resin storage tank (4), self-powered platform (5) can move along the inwall of resin storage tank (4), pattern generator (1) is positioned at the top of self-powered platform (5), described pattern generator (1) comprises the light source (1-1) that sets gradually along same axis, diaphragm (1-3), collimation lens (1-4), optical filtering (1-5), polarization conversion system PCS (1-6), light uniforming device (1-7) and polarization beam apparatus PBS (1-9), the outer periphery of light source (1-1) is equipped with reflector (1-2), the opening of reflector (1-2) is towards diaphragm (1-3), diaphragm (1-3) is positioned at the picture point place that reflector (1-2) reflection source light beam forms, the top of polarization beam apparatus PBS (1-9) is provided with reflection-type liquid crystal light valve LCoS (1-8), and the below of polarization beam apparatus PBS (1-9) is provided with plus lens (1-10).
2. method of utilizing the described device of claim 1 to carry out quick photocuring moulding, it is characterized in that, this method adopts a kind of light solidifying quick forming device, the structure of this device is: comprise computer (2), computer (2) links to each other with peristaltic pump (3) with pattern generator (1) respectively, peristaltic pump (3) communicates with resin storage tank (4), be provided with self-powered platform (5) in the resin storage tank (4), self-powered platform (5) can move along the inwall of resin storage tank (4), pattern generator (1) is positioned at the top of self-powered platform (5), described pattern generator (1) comprises the light source (1-1) that sets gradually along same axis, diaphragm (1-3), collimation lens (1-4), optical filtering (1-5), polarization conversion system PCS (1-6), light uniforming device (1-7) and polarization beam apparatus PBS (1-9), the outer periphery of light source (1-1) is equipped with reflector (1-2), the opening of reflector (1-2) is towards diaphragm (1-3), diaphragm (1-3) is positioned at the picture point place that reflector (1-2) reflection source light beam forms, the top of polarization beam apparatus PBS (1-9) is provided with reflection-type liquid crystal light valve LCoS (1-8), the below of polarization beam apparatus PBS (1-9) is provided with plus lens (1-10), and this method is specifically carried out according to the following steps:
Step 1: adopt computer (2) that the 3D model layering of required forming part (6) is handled, obtain each layering cross-section data of part (6) model, and these data are sent to the pattern generator (1) that links to each other with computer (2);
Step 2: the self-powered platform (5) that adopts computer (2) control to be arranged in the resin storage tank (4) descends, simultaneously, utilize computer (2) control peristaltic pump (3), by peristaltic pump (3) liquid photosensitive resin is delivered to the upper surface of the self-powered platform (5) that communicates with it by pipeline, forms the certain thickness liquid photosensitive resin layer of one deck (7) on the surface of self-powered platform (5);
Step 3: the cross-section data of part (6) model that pattern generator (1) provides according to computer (2), generate the optical digital view of part (6) each minute layer cross section, and this optical digital view is projected the liquid photosensitive resin layer (7) of the laying of self-powered platform (5) upper surface that is positioned at pattern generator (1) below, liquid towards photosensitive resin (7) curing that exposes forms the light-cured resin layer of part (6) when the starting section;
Step 4: the distance that is arranged at the thickness of self-powered platform (5) the decline one deck liquid photosensitive resin layer (7) in the resin storage tank (4);
Step 5: peristaltic pump (3) is given and to be positioned at the resin layer surface that the part (6) made on the self-powered platform (5) solidified and to lay the new liquid photosensitive resin layer (7) of one deck, and guarantees that the thickness of this liquid photosensitive resin layer (7) is even, surfacing;
Step 6: repeating step 3 is solidified on photosensitive resin until computer (2) all branch layer cross sections to the need forming part to step 5, promptly finishes the photocureable rapid shaping of whole part (6).
3. in accordance with the method for claim 2, it is characterized in that the method for work of described pattern generator (1) is carried out according to the following steps:
A. adopt a described light source (1-1), this light source (1-1) sends light beam, and light beam projects the inwall of the peripheral reflector (1-2) that is provided with of light source (1-1), behind reflector (1-2) inwall reflecting and collecting, converges at the imaging point of reflector (1-2);
B. the imaging point place of reflector (1-2) is provided with diaphragm (1-3), after the part veiling glare filtering in the light beam that diaphragm (1-3) converges reflector (1-2), light beam is penetrated by diaphragm (1-3), enter the collimation lens (1-4) that diaphragm (1-3) rear end is provided with, collimation lens (1-4) is converted into directional light with the light beam of incident, and from collimation lens (1-4), penetrate, enter the optical filtering (1-5) that collimation lens (1-4) back is provided with, optical filtering (1-5) will be injected in the light beam after the unwanted spectrum line filtering, penetrate by optical filtering (1-5), inject the polarization conversion system PCS (1-6) that optical filtering (1-5) rear end is provided with;
C. polarization conversion system PCS (1-6) is converted into the S polarised light with same polarization state with incident beam, and is penetrated by polarization conversion system PCS (1-6), enters the light uniforming device (1-7) that polarization conversion system PCS (1-6) rear end is provided with;
D. after light uniforming device (1-7) evenly distributes the light beam of injecting, penetrate by light uniforming device (1-7), enter the polarization beam apparatus PBS (1-9) that light uniforming device (1-7) rear end is provided with, inject the light beam of polarization beam apparatus PBS (1-9), through polarization beam apparatus PBS (1-9) reflection, project the reflection-type liquid crystal light valve LCoS (1-8) that polarization beam apparatus PBS (1-9) top is provided with;
E. enter the light beam of reflection-type liquid crystal light valve LCoS (1-8), after reflection-type liquid crystal light valve LCoS (1-8) modulation, reflected back polarization beam apparatus PBS (1-9), S polarised light after reflection-type liquid crystal light valve LCoS (1-8) modulation, have only P polarised light wherein to penetrate by polarization beam apparatus PBS (1-9) and by polarization beam apparatus PBS (1-9) is middle once more, project on the plus lens (1-10) of polarization beam apparatus PBS (1-9) below setting, controller among the reflection-type liquid crystal light valve LCoS (1-8) is according to the model layering sectional view graphic data of the part (6) of computer (2) transmission that is attached thereto, generate corresponding instruction and drive each pixel cell action of reflection-type liquid crystal light valve LCoS (1-8), generate the layering cross section figure of part (6), this figure is in company with the P polarised light, pass polarization beam apparatus PBS (1-9) and project plus lens (1-10), again by plus lens (1-10), project on the view imaging plane (1-11) that is arranged at plus lens (1-10) below, generate the optical digital view of current minute layer cross section of part (6) at view imaging plane (1-11).
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| EP2580039A4 (en) * | 2010-06-08 | 2017-12-27 | Kungsörs Plast Ab | A uv curing method and an assembly therefor |
| CN103128972B (en) * | 2013-03-24 | 2015-07-01 | 张哲夫 | Assembly-free 3D (three dimensional) printing formation method and device |
| CN104669619B (en) * | 2013-12-03 | 2019-03-05 | 上海普利生机电科技有限公司 | Light-cured type 3D printing equipment and its imaging system |
| DK3078482T3 (en) | 2013-12-03 | 2019-08-12 | Prismlab China Ltd | Light-curing 3D printer unit and imaging system thereto |
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| CN1603095A (en) * | 2004-11-11 | 2005-04-06 | 西安交通大学 | Resin coating apparatus for light solidifying rapid forming technique |
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| CN1603095A (en) * | 2004-11-11 | 2005-04-06 | 西安交通大学 | Resin coating apparatus for light solidifying rapid forming technique |
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