CN100544943C - The resin level control of photocureable rapid shaping and the method and apparatus of resin-coating - Google Patents
The resin level control of photocureable rapid shaping and the method and apparatus of resin-coating Download PDFInfo
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- CN100544943C CN100544943C CNB2007100264048A CN200710026404A CN100544943C CN 100544943 C CN100544943 C CN 100544943C CN B2007100264048 A CNB2007100264048 A CN B2007100264048A CN 200710026404 A CN200710026404 A CN 200710026404A CN 100544943 C CN100544943 C CN 100544943C
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Abstract
The present invention relates to a kind of photosensitive resin liquid surface height controlling of photocureable rapid shaping and the method and apparatus that resin bed applies, this method is in Rapid Prototyping Process the coating of resin liquid surface height controlling and resin bed to be combined, resin in the attached groove is injected by flexible duct by computer-controlled micro pump and to have in the scraper of cavity, finish the resin liquid surface height controlling simultaneously and apply at the resin bed of surface of the work via the horizontal movement of scraper on the major trough liquid level; What the present invention not only can overcome the regular knife chip scrapes easy defective work piece of quadratic method and the uneven shortcoming of coating, can overcome also that the negative-pressure adsorption-type scraper loses negative pressure easily and shortcoming that the resinous coat uniformity and bed thickness precision are reduced.Simultaneously, owing to only need carriage do the to descend motion of a cured layer thickness distance when surface of the work forms the uncured resin coat, thereby it is less and do not need the time of very long wait nature levelling to improve operating efficiency to the influence of fluctuations of the resin liquid level of major trough.
Description
Technical field
The invention belongs to quick original shape manufacturing technology field, relate generally to the control of the photosensitive resin liquid level in the photocurable quick shaping process process and needing the resin bed coating on shaping workpiece surface.
Background technology
RP technique is called for short RP technique again, its core is based on digitized novel forming technique, it can automatically, fast, directly, accurately be converted into design philosophy prototype or the direct finished parts (workpiece) with certain function, can shorten the R﹠D cycle of product effectively, be the strong instrument that improves the quality of products, reduces product cost.Photocureable rapid shaping be with can quick-setting photosensitive resin under the light radiation of specific wavelength be material, according to the CAD 3D model data of workpiece, the projection by scanning of computer-controlled laser beam or programmable photo mask makes the photosensitive resin top layer be solidified to form an accumulation horizon of workpiece.Then, the distance that the workbench of carrying workpiece vertically is displaced downwardly to an accumulation horizon by the requirement of technology recoats photosensitive resin (shaping workpiece stack layer) surface of having solidified and is covered with one deck uncured resin, repeating aforesaid photocuring step is bonded on the accumulation horizon of preceding one-step solidification the accumulation horizon of new cured resin, this process constantly repeats can produce the prototype of any complicated shape in this way fast till the whole work-piece manufacturing is finished.
Obviously, in above-mentioned photocuring process, keep the resin liquid level at sustained height and manage to apply the last layer uncured resin layer equably and guarantee that the precision of its bed thickness is very extremely important at the resin surface that has solidified (workpiece), it directly influences the dimensional accuracy of shaping workpiece in vertical direction, and deviation seriously can cause whole work-piece to be scrapped.
Usually there are two kinds of methods to be used for the photosensitive resin liquid surface height controlling of photocurable quick shaping process.A kind of is press over system, it is a kind of method of simple possible, its principle is constantly the resin in the attached groove to be added in the major trough by a pump that moves continuously, the resin that has more when resin in the major trough is higher than the height of overfall can overflow be got back to attached groove, thereby this process constantly repeats to keep the resin liquid level at a certain fixing height (by the height decision of overfall).Owing to be subjected to the influence of resin viscosity, liquid level has a difference in height during resin overflow, and changes in flow rate, the resin that changes (mainly being Temperature Influence), pump when the viscosity of resin replenishes mouthful and the overfall design is unreasonable etc. all can cause resin liquid level difference in height to change greatly.Therefore, press over system is used for the occasion not high to the required precision of laminated thickness more.Another kind is the optics control method, and it is the higher method of a kind of precision.This method is to utilize the laser beam irradiation resin liquid level of non-sensitive wavelength, the position of surveying resin liquid area scattering hot spot or folded light beam by CCD image device or PSD (position sensor) detects the height of resin liquid level, and then keeps the resin liquid level at a certain required height by the computer control motor elevate a turnable ladder resin storage tank or the mode of regulating piston position in the resin storage tank.Optics control method more complicated, and,, just measure relatively difficulty as resin material to clear, colorless because different resin materials is very big to scattering of light and reflection differences, and this method also is subjected to certain restriction to the applicability of different resins material.
Commonly used be: after one deck resin of former coating on the workpiece is cured in the method for the uncured photosensitive resin of curing resin layer surface-coated one deck, the workbench of carrying workpiece vertically moves down a certain distance by the requirement of technology, and (as the coating bed thickness that requires resin is 0.1mm, then move down the distance of 0.5mm even bigger) workpiece is immersed in the resin fully, move 0.4mm then on the workbench and make surface of the work form the thick uncured resin bed of one deck 0.1mm.In fact; owing to light-cured resin is that a kind of material of high viscosity is difficult for the nature levelling; only can't obtain the uniform resin coating layer of thickness with the method; usually also must be aided with the levelling that the strickling device that can move horizontally quickens resin, wipeing device off can be common chip scraper or the scraper that has the negative-pressure adsorption cavity.The former need adjust edge of a knife position when work and the resin liquid level is in full accord, utilize the knife edge of the edge of a knife unnecessary resin to be blown and quickens off the levelling of resin, because the resin when doing to wipe motion off before and after the scraper exists the effect of dragging of pressure differential and resin viscous force can cause the backflow of resin, the uniformity and the bed thickness precision of resin coating layer all are affected, in addition owing to shrink that the workpiece that causes is small to stick up change during resin solidification, thereby the error of the movable workbench of the error of resin liquid surface height controlling and carrying workpiece all can very easily make scraper run into the resin bed that has solidified when motion and damage workpiece; The latter makes the scraper with cavity structure and adjusts edge of a knife position a little more than resin liquid level (0.1mm ~ 0.3mm) wipeing device off, utilize the tension force capillarity of principle of negative pressure and resin surface can make in the cavity of scraper and have a certain amount of resin, during the scraper motion, the scraper edge of a knife can then can be filled and led up the resin that the projection of uncured resin layer on the workpiece is wipeed off in the scraper cavity to sunk part, though the scraper of this structure can directly not contact with the resin bed that has solidified when motion, but owing between the edge of a knife and the resin liquid level gap is arranged, the carriage lifting causes the minor variations of resin liquid level, the as easy as rolling off a log negative pressure that lose of scraper cavity that make of reason such as the depression that causes or scraper rapid movement that are difficult for flowing owing to resin viscous when workpiece sinks influence the uniformities that uncured resin layer applies on the workpiece, finally influence the quality that workpiece makes even lead to the failure.Simultaneously, carriage must be made back and forth movement up and down when above-mentioned technical process formed the uncured resin coat at surface of the work, and it causes that the resin liquid level height change of major trough is very big, needed the long time to wait for resin nature levelling, prolong the Production Time of workpiece, reduced operating efficiency.
In addition, the method that above-mentioned resin liquid level observing and controlling and resin bed apply is often independent separately in actual use to be subsystem, and observing and controlling of resin liquid level and resin bed apply the coordination control more complicated between two subsystems.Therefore, existing method is difficult to realize easily the accurate control of resin liquid level and the uniformity and the bed thickness precision of assurance resin coating layer.
Summary of the invention
Deficiency in view of said method and technology existence, first purpose of the present invention is to provide a kind of resin liquid surface height controlling and resin bed painting method of photocurable quick shaping process, it is characterized in that resin level control and resin bed coating are combined, realize that simultaneously resin liquid surface height controlling and resin bed apply, and specifically comprise following each step:
(1), when resin liquid level (13) exceeds overfall (3) in the major trough (1), the resin that has more flows in the attached groove (2) by overfall (3), the resin liquid surface height controlling of realization major trough (1);
(2), be subjected to computer-controlled micro pump (6) resin in the attached groove (2) to be injected into storage temporarily in the cavity of scraper (8) by flexible duct (7), described scraper (8) has inboard and the outside knife edge, is provided with the space that communicates with cavity between the interior knife edge;
(3), scraper (8) does horizontal movement in major trough resin liquid level (13) top, the resin of storing in cavity injects by above-mentioned space finishes on the surface-coated of workpiece (14) newly one deck uncured resin and levelling resin in the major trough (1).
Second purpose of the present invention is to provide a kind of device of using said method, this device comprises thermostatically controlled major trough (1) and attached groove (2), and the micro pump (6) that is communicated with scraper (8) by flexible duct (7), key is that described scraper (8) has inboard and the outside knife edge, leave the space between the interior knife edge, the resin of attached groove (2) flows to major trough (1) by this space.
The resin storage tank of light-curing rapid forming equipment is designed to major trough (1) and attached groove (2) structure, major trough (1) has overfall, the resin that has more when the resin liquid level exceeds overfall flows in the attached groove (2) by overfall, and resin can add to major trough (1) by pump and keep the resin liquid level in the attached groove (2).
Resin is wipeed the scraper (8) that device is designed to have the resin reservoir cavity off, and scraper (8) is installed in the resin liquid level top of major trough (1) and can moves horizontally.
Resin is injected into interior temporary transient storage of cavity of scraper (8) by a micro pump in the attached groove (2), and then flows to the height that major trough (1) is kept the resin liquid level via scraper (8).
When scraper was done reciprocal horizontal movement, the projection that the forward of scraper (8) or back cutting edge of a knife or a sword can be higher than uncured resin layer in the workpiece liquid level was wipeed the resin be stored in scraper (8) cavity off and then can be filled and led up sunk part.
The present invention adopts the coating that realizes resin bed on major trough resin liquid surface height controlling and the workpiece to the method for the cavity injection resin of the scraper that can move horizontally simultaneously, what it not only can overcome the regular knife chip scrapes easy defective work piece of quadratic method and the uneven shortcoming of coating, can overcome also that the negative-pressure adsorption-type scraper loses negative pressure easily and shortcoming that the resinous coat uniformity and bed thickness precision are reduced; Because the carriage motion of a cured layer thickness distance of only need doing to descend when surface of the work forms the uncured resin coat, thereby it is less and do not need the time of very long wait nature levelling to improve operating efficiency to the resin liquid level effect of altitude of major trough.
Description of drawings
Fig. 1 is a schematic diagram of the present invention, wherein: major trough 1, attached groove 2, overfall 3, major trough light-cured resin 4, attached groove light-cured resin 5, micro pump 6, flexible resin carrier pipe 7, scraper 8, scraper cavity light-cured resin 9, scraper travelling carriage 10, carriage travelling carriage 11, work supporting block 12, major trough resin liquid level 13, workpiece 14, scanner 15, dynamic focus control 16, ultraviolet laser 17, scanning light beam 18, computer 19, scraper move horizontally direction a, the vertical moving direction b of carriage.
Fig. 2 is the thermostatic control resin storage tank schematic diagram with major trough and attached groove structure, wherein: major trough 1 is used for the light-cured resin 4 of splendid attire shaping workpiece, attached groove 2 is used for being contained in the Workpiece shaping process and passes through the unnecessary resin 5 that overfall 3 flows out because of the resin liquid level of keeping major trough, major trough 1 and attached groove 2 adopt sandwich, fill heat-conducting medium 6 in the interlayer, heat-conducting medium 6 is to use thermal capacitance and the bigger heat conduction oil of thermal conductivity factor, make resin in the process of heating and photocuring, keep even temperature as far as possible, can make the operating temperature of light-cured resin maintain a certain setting value by thermostatically-controlled equipment control electric heater 7 at the resin storage tank different parts.
Fig. 3 is the scraper schematic diagram with cavity structure, and Fig. 3 a is the profile signal of scraper, and Fig. 3 b is the cross section signal of scraper, and the resin of depositing is used for carrying out the coating of uncured resin layer and replenishing the height that resin is kept the resin liquid level to major trough at surface of the work.
Fig. 4 is the scheme of installation of scraper, scraper 8 is installed on the travelling carriage 10 that can move horizontally on the major trough, it is consistent with the height of resin liquid level 6 that governor motion can be adjusted the height of the scraper edge of a knife 7, by the reciprocal horizontal movement shown in a direction of arrow in the computer 19 control scraper mappings, on the surface of workpiece, apply uncured resin layer and quicken the resin levelling.
Photosensitive resin flowed to schematic diagram when Fig. 5 was work, the resin 5 of the attached groove 2 of micro pump 6 pumping is pressed A among the figure, the B direction of arrow adds in the cavity of scraper 8, the resin of depositing in the scraper cavity is because the effect of gravity flows to major trough by the direction of C arrow, when moving, scraper forms a resin overlay on the surface of workpiece, when the liquid level of the resin 4 of major trough is higher than overfall 3, to keep the resin liquid level of major trough constant thereby unnecessary resin flows to attached groove 2 by overfall, during waiting for the gentle beam flying of resin spontaneous current, scraper rests on the side by overfall, and it can reduce the variation of the resin gradient of liquid level that causes when flowing to major trough because of the resin in the scraper cavity.
The specific embodiment
Referring to Fig. 1, the present invention includes: a thermostatic control resin storage tank with major trough 1, attached groove 2 and overfall 3 structural designs, major trough 1 is used for the required photosensitive resin of splendid attire Workpiece shaping 4, and attached groove 2 is used for being contained in the Workpiece shaping process and passes through the unnecessary resin 5 that overfall 3 flows out because of the resin liquid level of keeping major trough; Micro pump 6 also connects to be transported to the resin 5 of attached groove 2 by flexible duct 7 and deposits and add to major trough 1 in the scraper cavity, computer 19 can be controlled the switch and the flow of micro pump 6, when the resin liquid level 13 of major trough is higher than overfall 3, unnecessary resin just flows to attached groove 2 by overfall 3, thereby the resin liquid level of keeping major trough is constant at the height of overfall; Scraper 8 with sealed cavity design, the cavity of scraper has a certain amount of resin 9, be used for carrying out the coating of uncured resin layer and replenishing the height that resin is kept the resin liquid level to major trough at surface of the work, scraper 8 is installed on the top and the travelling carriage that can move horizontally of major trough liquid level 7, the edge of a knife height of adjusting scraper 8 is consistent with the resin liquid level, after finishing the current one deck resin solidification of surface of the work, computer 19 control carriage travelling carriages 11 make workpiece move down the reciprocal horizontal movement shown in a direction of arrow in the distance of a cured layer and scraper 8 mappings, play to be coated with on the surface of workpiece 14 uncured resin and the acceleration resin levelling that are covered with new one deck.
During work, the electrothermic constant temperature equipment of major trough keep resin in the operating temperature of a certain setting so that reduce the viscosity of resin, computer 19 forms a cured layer at the photosensitive resin liquid level 13 of major trough do two-dimensional scan according to individual-layer data (or supporting data) the control laser beam 18 of workpiece design.In beam flying, dynamically focus control 16 also carries out dynamic focal length adjustment according to the deflection angle of scanner speculum and guarantees that the size of beam and focus is constant at whole scanning plane under the control of computer.After one deck resin scanning curing is finished, computer drives carriage according to technological requirement control travelling carriage and makes the descend distance (being generally 0.1mm) of a cured layer of workpiece, micro pump is started working the resin transfer of attached groove 2 is deposited in the cavity 9 of scraper 8 simultaneously, and computer 19 control scrapers 8 are done reciprocal horizontal movement.Because the viscosity of light-cured resin, the phenomenon protruding or cave in can appear in the resin on surface that carriage moves down the back workpiece, the reciprocal horizontal movement one of scraper 8 is to quicken the resin levelling that surface of the work protrudes, the 2nd, replenish resin to the surface of the work sunk part, form new one deck resin bed to be solidified.Scraper is finished the coating of one deck uncured resin by reciprocal horizontal movement, guaranteed that resin bed applies evenly.The stop place of scraper stop motion is a side that is positioned at the major trough overfall, can be apace when making scraper make return movement with move down owing to carriage or the scraper cavity in the resin deposited flow under the effect of gravity that major trough causes that major trough resin liquid level raises and additional resin scrapes the position by overfall, accelerate resin and flow and can reduce the variation of the resin gradient of liquid level that causes when flowing to major trough, thereby keep liquid level stable of resin because of the resin in the scraper cavity to overfall.
Compare with resin bed coating way with the existing resin liquid level control that is separated from each other, the present invention is characterized in that tree Fat level control and resin bed apply and combine, and realize simultaneously the major trough resin liquid level to the cavity resin by injection of scraper Highly control and carry out resin bed on the surface of shaping workpiece and apply, it not only can overcome scraping square of regular knife chip The easy defective work piece of method and the inhomogeneous shortcoming of coating also can overcome the negative-pressure adsorption-type scraper and lose negative pressure easily and make The shortcoming that the resinous coat uniformity and bed thickness precision reduce. Simultaneously, owing to form the uncured resin coating at surface of the work Only need carriage to do the motion of decline one cured layer thickness distance during layer, it is to the influence of fluctuations of the resin liquid level height of major trough Thereby littler and do not need the time of the wait nature levelling grown very much to improve operating efficiency.
Claims (2)
1, a kind of resin liquid surface height controlling and resin bed painting method that is used for photocureable rapid shaping is characterized in that this method comprises following each step:
(1) when resin liquid level (13) exceeded overfall (3) in the major trough (1), the resin that has more flow in the attached groove (2) by overfall (3), realized the resin liquid surface height controlling of major trough (1);
(2) be subjected to computer-controlled micro pump (6) resin in the attached groove (2) to be injected into storage temporarily in the cavity of scraper (8) by flexible duct (7), described scraper (8) has inboard and the outside knife edge, is provided with the space that communicates with cavity between the interior knife edge;
(3) scraper (8) is done horizontal movement in major trough resin liquid level (13) top, and the resin of storing in cavity is finished new one deck uncured resin and levelling resin on the surface-coated of workpiece (14) when injecting major trough (1) by above-mentioned space.
2, according to a kind of device of the described method of claim 1, comprise thermostatically controlled major trough (1) and attached groove (2), and the micro pump (6) that is communicated with scraper (8) by flexible duct (7), it is characterized in that described scraper (8) has inboard and the outside knife edge, leave the space between the interior knife edge, the resin of attached groove (2) flows to major trough (1) by this space.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100264048A CN100544943C (en) | 2007-01-19 | 2007-01-19 | The resin level control of photocureable rapid shaping and the method and apparatus of resin-coating |
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| CNB2007100264048A CN100544943C (en) | 2007-01-19 | 2007-01-19 | The resin level control of photocureable rapid shaping and the method and apparatus of resin-coating |
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| CN100544943C true CN100544943C (en) | 2009-09-30 |
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