CN108472874A - Three-dimensional printer and its light output arrangement - Google Patents
Three-dimensional printer and its light output arrangement Download PDFInfo
- Publication number
- CN108472874A CN108472874A CN201780005853.6A CN201780005853A CN108472874A CN 108472874 A CN108472874 A CN 108472874A CN 201780005853 A CN201780005853 A CN 201780005853A CN 108472874 A CN108472874 A CN 108472874A
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- Prior art keywords
- light
- accumulator tank
- output
- dimensional printer
- light source
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
The present invention relates to three-dimensional printer and its light output arrangements, include according to the present invention：Light source sends out the output light for being used to form 3 D stereo printed matter；Accumulator tank, storage print object material, the printed matter material are used to form the 3 D stereo printed matter by the output light sent out from the light source side；Galvanometer (galvanometer) adjusts the light path (light path) of the output light sent out from the light source side between the light source and the accumulator tank；And convergence correction tool, in the light path of the output light between the galvanometer and the accumulator tank, and correct the focus by the galvanometric output light.
Description
Technical field
The present invention relates to three-dimensional printers, relate to the type plate side that correction is irradiated to three-dimensional printer in more detail
Light focus three-dimensional printer and its light output arrangement.
Background technology
In recent years, it has developed and has utilized the three-dimensional printer for reproducing the article straight forming to the three-dimensional data of article
Technology, and its utilization rate increasingly increases.
The three-dimensional printer is roughly divided into following 4 kinds of modes according to printing type：FDM(StereoLith ography
Apparatus, Fused Deposition Modeling) mode, DLP (Digital Light Processing, digital light processing) mode, SLA
(Selective Laser Sintering, Stereolithography) mode, SL S (Selective Laser Sintering, choosing
Domain laser powder sintering) mode, and as the various materials for using material that such as ceramics, plastics, metal and resin is used
Material.
FDM modes are stacked in three dimensions as while target object is formed two dimensional surface shape to form shape
Mode is that stacking should after melting supplied Filamentous feed by nozzle after supplying the filiform feed made of thermoplastic resin
Filiform is fed to form the technical approach of three-dimension object, to this in No. 10-2015-0134186 equal quilts of KR published patent
It is open.
SLS modes are using functional polymer or metal powder and the technical approach for irradiating laser sintering and moulding；SLA
Mode is utilized to light-hardening resin irradiation light (light) so that the technical approach of the principle of illuminated partially hardened；The side DLP
Formula is the principle for reacting on light using hardening resin and being hardened identical as SLA modes, is projected into hardening resin illumination beam
The technical approach of type.
About the DLP modes, the technology having researched and developed and described Ebrean Registered Patent the 10-533374th etc..
On the other hand, DLP modes or SLA modes etc., for carrying out 3 D-printing using light, it is important to will
Light exactly impacts the point to be irradiated.This is because light be more accurately irradiated in the point to be irradiated can print it is more vertical
Body and accurate molding.If the accuracy of light irradiation reduces, coarse molding is formed, therefore has to reduce accurate
Degree, so the accuracy of light irradiation is also extremely important.
But it needs the position irradiated in order to make illumination be mapped to and light irradiation is being adjusted by galvanometer or speculum etc.
Error (for example, being irradiated in the error of circular dot (spot) distortion of the light of type plate etc.) is susceptible to during path, because
This truth is the technology for being required to correct this error.
Invention content
(solving the problems, such as)
It is above-mentioned existing it is an object of the invention to solve the problems, such as, it provides to correct to send out light process from light source side and examine and flow
The three-dimensional printer and its light output arrangement of meter or speculum generable error while irradiation to type plate side.
(means solved the problems, such as)
The light output arrangement of three-dimensional printer of the present invention for reaching purpose as described above includes：Light source is sent out
It is used to form the output light of 3 D stereo printed matter；Accumulator tank, storage print object material, the printed matter material be used for by from
The output light that the light source side is sent out forms the 3 D stereo printed matter；Galvanometer (galvanometer) is located at institute
It states between light source and the accumulator tank, adjusts the light path (light path) of the output light sent out from the light source side；With
And convergence correction tool, in the light path of the output light between the galvanometer and the accumulator tank, and correct warp
Cross the focus of the galvanometric output light.
Here, further including speculum, the speculum changes the irradiation side of the output light sent out from the light source side
To；Wherein, the speculum can be located at front side or the rear side of the convergence correction tool in the light path of the output light.
Here, the light source can be laser (laser) or ultraviolet light.
Here, the convergence correction tool can be that f-theta lens (F-theta lense) or telecentricity flat field are poly-
Focus lens (telecentric F-theta lense).
Moreover the f-theta lens either height at telecentricity f-theta lens adjustable lens center or angle
Degree.
For reach purpose as described above the present invention three-dimensional printer include：Light source sends out and is used to form three-dimensional
The output light of three-dimensional printing object；Accumulator tank, storage print object material, the printed matter material are used for by being sent out from the light source side
The output light gone out forms the 3 D stereo printed matter；Galvanometer, between the light source and the accumulator tank, adjustment
The light path of the output light sent out from the light source side；Convergence correction tool, be located at the galvanometer and the accumulator tank it
Between the output light light path on, and correct the focus by the galvanometric output light；And the Shear tool,
It is combined with the accumulator tank, and tilts the accumulator tank.
Here, further including speculum, the speculum changes the irradiation side of the output light sent out from the light source side
To；Wherein, the speculum is located at front side or the rear side of the convergence correction tool in the light path of the output light.
Here, the light source can be laser (laser) or ultraviolet light.
Here, the convergence correction tool can be that f-theta lens (F-theta lense) or telecentricity flat field are poly-
Focus lens (telecentric F-theta lense).
Here, the f-theta lens either height at telecentricity f-theta lens adjustable lens center or angle
Degree.
Here, further including type plate, the type plate is located at the upside or inside of the accumulator tank, and supports by institute
State printed matter made of output photo-hardening.
Here, described the Shear tool tilts the accumulator tank, so that the side of the accumulator tank and the inclined side in the other side
To identical.
Described the Shear tool includes：Inclined shore portion is combined to support the accumulator tank with the accumulator tank, and includes
Tilt the titling axis that the hinge at the center of the accumulator tank combines；And pitch drives portion, it is cut with scissors with the inclined shore portion
Chain combination, and the other side of the accumulator tank is driven to rise or decline, so that the accumulator tank tilts.
(The effect of invention)
The three-dimensional printer and its light output arrangement of the present invention can correct the exposure pathways of the light sent out from light source side
Simultaneously can caused by error, therefore improve the accuracy of the light irradiated to type plate side.Accordingly, have the effect of as follows：It carries
The reproduction accuracy of the molding of height printing, and the molding of high-quality can be printed.
In addition, in one layer of rear-inclined accumulator tank of molding, and then can effectively disperse by the viscous of type plate and the resin of hardening
Property and density generate pressure, and then can effectively keep parallel between sink and type plate after inclination.Accordingly, also have
There is effect below：Can inhibit so correct because each layer of printed matter it is in uneven thickness due to such as inclined mistake that occurs
Or even error, and then improve the reproducibility of three-dimensionally shaped object.
Description of the drawings
Fig. 1 be schematically show the embodiment of the present invention three-dimensional printer light output arrangement and one of three-dimensional printer
The partial perspective view divided.
Fig. 2 and Fig. 3 is in order to illustrate the three-dimensional printer light output arrangement of the embodiment of the present invention and in 3 D-printing
Machine corrects light and the sectional side view that schematically shows.
Fig. 4 and Fig. 5 is in order to illustrate the three-dimensional printer light output arrangement of the invention implemented and by three-dimensional printer
The sectional side view for tilting accumulator tank and schematically showing.
Specific implementation method
Hereinafter, in order to understand the present invention in further detail, the preferred embodiment with reference to attached drawing will be illustrated.
Fig. 1 be schematically show the embodiment of the present invention three-dimensional printer light output arrangement and one of three-dimensional printer
The partial perspective view divided.Fig. 2 and Fig. 3 is in order to illustrate the three-dimensional printer light output arrangement of the embodiment of the present invention and three
The sectional side view tieed up printer calibration light and schematically shown.Fig. 4 and Fig. 5 is the 3 D-printing implemented in order to illustrate the present invention
Machine light output arrangement and the sectional side view schematically shown by three-dimensional printer inclination accumulator tank.
First, referring to figs. 1 to Fig. 5, the 3 D Printer light output arrangement of the embodiment of the present invention may include：Light source,
Accumulator tank, galvanometer and convergence correction tool, more preferably may also include speculum.
Light source (light source) 100 exports the output light L for being used to form 3 D stereo printed matter (not shown).The light
The light high as linearity of source 100, preferably sends out the output light L for the light-hardening resin M for capableing of sclerosing liquid, wherein the liquid
Body light-hardening resin is to beat object material M to be stored in aftermentioned accumulator tank 200.
Preferably, light source 100 is to send out ultraviolet light (UV:Ultra Violet) or laser (Laser) light source.
Accumulator tank 200 is to store by shining the output light L-shaped irradiated into 3 D stereo printed matter from 100 side of light source
Printed matter material M and be configured.
Preferably, which is made of the material of translucency.It is irradiated by 200 bottom surface of accumulator tank defeated
The light-hardening resin of light extraction L hardening is combined with 170 side of type plate, forms 3 D stereo printed matter.
Galvanometer (galvanometer) 110 is also referred to as galvanometer mirror (mirror), hereinafter referred to as galvanometer
(galvanometer) it 110 illustrates.Galvanometer 100 is between light source 100 and accumulator tank 200.Then, it adjusts from light source
The light path (light path) for the output light L that 100 sides are sent out.
Galvanometer 110 can have multiple according to demand.The shape of two galvanometers 110 of configuration is exemplarily illustrated in drawing
State.According to design, the form with more than two or a galvanometer 110 also can be fully realized.
It is to be illuminated in the position in accumulator tank using the galvanometer 110 adjustment output light L, accordingly only to output light to be illuminated
The position irradiation output light L of L.
When output light L is irradiated by galvanometer 110 to 170 side of type plate, periphery point (spot) of output light L may occur in which
While angle tilt the problem of the focuses misalignment such as distortion or dispersion.In order to avoid there is this problem, preferably have
There is convergence correction tool 130.
In the light path of output light L of the convergence correction tool 130 between galvanometer 110 and accumulator tank 200.Then, school
Pass by the focus of the output light L of galvanometer 110.
Preferably, as convergence correction tool 130 as described above be f-theta lens (F-theta l ense) or
Person's telecentricity f-theta lens (telecentric F-theta lense).
Preferably, telecentric light is made in the light of such as laser or ultraviolet light by telecentricity f-theta lens, with principal ray
It is independently vertically irradiated in printing surface whenever and wherever possible.
Then, it preferably can vertically adjust output light L and be incident in f-theta lens as convergence correction tool 130
Or the incidence angle of telecentricity f-theta lens.
Alternatively, preferably adjust the light path of output light L by be used as convergence correction tool 130 f-theta lens or
The center of telecentricity f-theta lens.The intermediate region in the face of lens can also be flat plate shape, in this case, excellent
It is selected as adjustable faces of the output light L by flat plate shape.
It is preferably adjustable for the f-theta lens or telecentricity f-theta lens as convergence correction tool 130
The height of lens centre is saved, and angle can also be adjusted.
Schematically show that output light L is irradiated in point on type plate 170 (that is, on type plate downside on the right side of Fig. 2
Point) apperance, show point (spot) the shape F of output light L.In this way, with round dot shape F it is accurate it is illuminated be extremely important
's.
But the downside of the type plate 170 shown on the right side of Fig. 3, adjusting the position of output light L to be illuminated
In the case of the convergence correction tool 130 that such as f-theta lens or telecentricity f-theta lens are not present in the process, shine
The shapes such as ovalisation can be distorted rather than round in the dot shape F of the output light L of the perimeter sides of type plate 170 by penetrating.
To avoid the above situation, keep the f-theta lens or telecentricity f-theta as convergence correction tool 130 saturating
Mirror is arranged in light path, and then with reference to the downside of the type plate 170 shown on the right side of Fig. 3, is irradiated in 170 downside of type plate
The dot shape F of laser be corrected into circle, therefore can accurately and precisely harden light-hardening resin M.
Then, speculum 150 changes the direction of the output light L sent out from 100 side of light source.For example, as shown, in light source
In the case that 100 are located at galvanometer 110 on the downside of accumulator tank 170, speculum 150 is by the bottom surface of accumulator tank 200 to type plate
170 lateral reflection output light L.Here, preferably, the bottom surface of accumulator tank 200 has translucency.
Preferably, the speculum 150 in the light path of output light L positioned at convergence correction tool 130 front side or after
Side.In drawing, the configuration of speculum 150 is illustrated in f-theta lens as convergence correction tool 130 or remote
The form of the rear side of heart f-theta lens.
Hereinafter, with continued reference to Fig. 1 to Fig. 5, illustrate include the embodiment of the present invention three-dimensional printer light output arrangement
Three-dimensional printer.
The three-dimensional printer of the embodiment of the present invention may include：Light source, accumulator tank, galvanometer, convergence correction tool and
The Shear tool more preferably may also include speculum, and may also include type plate.
Here, light source 100, accumulator tank 200, galvanometer 110, convergence correction tool 130 and speculum 150 with above state
Bright is roughly the same, therefore omits to this explanation, will be illustrated below with the Shear tool to type plate 170.
Type plate 170 is located at the upside or inside of accumulator tank 200.Then, make at least part be impregnated in be stored in
Deposit the liquid light-hardening resin as printed matter material M in slot 200.Type plate 170 supports the output light sent out from light source 100
The printed matter (not shown) that L is formed by photo-hardening.
Type plate 170 carry out photo-hardening and when often forming one layer, it is bit by bit laterally moved upwards, to gradually to
Upper movement is until printed matter is completed to be molded.
The Shear tool is combined to be supported with accumulator tank 200, and tilts accumulator tank 200.
Preferably, which tilts accumulator tank 200, so that the side of accumulator tank 200 and the inclined direction in the other side
It is identical.
Preferably, which includes inclined shore portion and pitch drives portion.
Inclined shore portion is combined with accumulator tank 200, and includes that the hinge of inclination accumulator tank 200 combines 400 inclination rotation
Shaft.The inclined shore portion includes being incorporated in the downside of accumulator tank 200 to support the tilt frame 230 of accumulator tank 200.
As shown, the side of tilt frame 230 is combined 400 with 250 hinge of frame upper plate.Here, frame upper plate 250 is made
To distinguish the shell plate of upside and lower side space centered on accumulator tank 200, (can not show with the case body of three-dimensional printer
Go out) secure bond.Accordingly, frame upper plate 250, which plays, makes the inclined fixed basic role of accumulator tank 200.
That is, the horizontal fixed frame upper plate 250 centered on the titling axis that hinge combines 400, and can make
Tilt frame 230 rotationally combines 400 in fixed angular range by hinge.
For this purpose, as shown, preferably in frame upper plate 250 configured with the hinge that can be combined 400 with Sloped rotating pivot hinge
Chain hole.
Pitch drives portion is combined with inclined shore portion hinge, so that accumulator tank 200 can tilt.In more detail, with incline
230 hinge of tilt frame in bearing diagonal portion combines.Then, the other side for rising or declining accumulator tank 200, so that accumulator tank
200 in inclination or horizontality.
Pitch drives portion may also comprise：Incline motor 350, screw bolt-type screw 330 and nut profile shaft 310.
Incline motor 350 is the motor for tilting accumulator tank 200 and driving.Preferably, which is stepping
Motor.When quickly continuously applying pulse, incline motor 350 plays the role of syncmotor, can realize and be accurately controlled,
And then the angle of inclination in pitch drives portion can be accurately controlled.Preferably, accumulator tank 200 is made by the rotation of incline motor 350
State in inclination or level.
Screw bolt-type screw 330 is rotated by incline motor 350.The screw bolt-type screw 330 forms bolt line outside,
And the shape of preferably section is trapezoidal bolt line.Here, bolt line is also referred to as screw thread, refer to the spiral shell from the fold of bolt
Follow closely the part of type profile protrusion.It is known as bolt line in the present specification.
Preferably, the section apperance of the bolt line of screw bolt-type screw 330 forms trapezoidal shape, reduces and nut profile shaft 310
Contact wear, therefore durability and accuracy can be improved.
It is rotated as shown, screw bolt-type screw 330 is combined into the engagement in the downside of nut profile shaft 310.Accordingly, pass through
The rotation of screw bolt-type screw 330 makes nut profile shaft 310 rise or decline.
As shown, the upside of nut profile shaft 310 is combined with 230 hinge of tilt frame.Accordingly, with nut profile shaft
310 rising, tilt frame 230 is in horizontality, and with the decline of nut profile shaft 310, tilt frame 230 is inclined by.
Then, accumulator tank 200 is combined with tilt frame 230, therefore accumulator tank 200 can be in together with tilt frame 230
Horizontality or heeling condition.
By including the Shear tool tiltable accumulator tank in inclined shore portion as described above and pitch drives portion, and
The fissility between printed matter (not shown) and accumulator tank 200 can be improved.
More than, as described above, the three-dimensional printer and its light output arrangement of the present invention can be corrected and be sent out from light source side
While the exposure pathways of light can caused by error, therefore improve the accuracy of the light irradiated to type plate side.Accordingly, have
Following effect：The reproduction accuracy of the molding of printing is improved, and the molding of high-quality can be printed.
In addition, in one layer of rear-inclined accumulator tank of molding, and then can effectively disperse by the viscous of type plate and the resin of hardening
Property and density generate pressure, and then can effectively keep parallel between sink and type plate after inclination.Accordingly, also have
There is effect below：Can inhibit so correct because each layer of printed matter it is in uneven thickness due to such as inclined mistake that occurs
Or even error, and then improve the reproducibility of three-dimensionally shaped object.
More than, illustrating for the present invention is realized by the embodiment with reference to attached drawing as described above, but above-described embodiment
The preferred embodiment of the present invention is merely illustrated, therefore must not be interpreted as that present invention is limited only by above-described embodiments, but is answered
The interest field for understanding the present invention by right and its equivalent conception.
Claims (13)
1. a kind of light output arrangement of three-dimensional printer, which is characterized in that including：
Light source sends out the output light for being used to form 3 D stereo printed matter；
Accumulator tank, storage print object material, the printed matter material are used for the output light by being sent out from the light source side
Form the 3 D stereo printed matter；
Galvanometer adjusts the light of the output light sent out from the light source side between the light source and the accumulator tank
Road；And
Convergence correction tool in the light path of the output light between the galvanometer and the accumulator tank, and corrects
By the focus of the galvanometric output light.
2. the light output arrangement of three-dimensional printer according to claim 1, which is characterized in that further include：
Speculum changes the direction of illumination of the output light sent out from the light source side；
Wherein, the speculum is located at front side or the rear side of the convergence correction tool in the light path of the output light.
3. the light output arrangement of three-dimensional printer according to claim 1, which is characterized in that
The light source is laser or ultraviolet light.
4. the light output arrangement of three-dimensional printer according to claim 1, which is characterized in that
The convergence correction tool is f-theta lens or telecentricity f-theta lens.
5. the light output arrangement of three-dimensional printer according to claim 4, which is characterized in that
The height or angle at the f-theta lens either telecentricity f-theta lens adjustable lens center.
6. a kind of three-dimensional printer, which is characterized in that including：
Light source sends out the output light for being used to form 3 D stereo printed matter；
Accumulator tank, storage print object material, the printed matter material are used for the output light by being sent out from the light source side
Form the 3 D stereo printed matter；
Galvanometer adjusts the light of the output light sent out from the light source side between the light source and the accumulator tank
Road；
Convergence correction tool in the light path of the output light between the galvanometer and the accumulator tank, and corrects
By the focus of the galvanometric output light；And
The Shear tool is combined with the accumulator tank, and tilts the accumulator tank.
7. three-dimensional printer according to claim 6, which is characterized in that further include：
Speculum changes the direction of illumination of the output light sent out from the light source side；
Wherein, the speculum is located at front side or the rear side of the convergence correction tool in the light path of the output light.
8. three-dimensional printer according to claim 6, which is characterized in that
The light source is laser or ultraviolet light.
9. three-dimensional printer according to claim 6, which is characterized in that
The convergence correction tool is f-theta lens or telecentricity f-theta lens.
10. three-dimensional printer according to claim 6, which is characterized in that
The height or angle at the f-theta lens either telecentricity f-theta lens adjustable lens center.
11. three-dimensional printer according to claim 6, which is characterized in that further include：
Type plate is located at the upside or inside of the accumulator tank, and supports the printed matter made of the output photo-hardening.
12. three-dimensional printer according to claim 6, which is characterized in that
Described the Shear tool tilts the accumulator tank, so that the side of the accumulator tank is identical as the inclined direction in the other side.
13. three-dimensional printer according to claim 12, which is characterized in that
Described the Shear tool includes：
Inclined shore portion is combined with the accumulator tank to support the holding tank, and includes the center for tilting the accumulator tank
Hinge combine titling axis；And
Pitch drives portion is combined with inclined shore portion hinge, and drive the accumulator tank the other side rise or under
Drop, so that the accumulator tank tilts.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2016-0001188 | 2016-01-05 | ||
| KR1020160001188A KR101780928B1 (en) | 2016-01-05 | 2016-01-05 | 3D Printer and Optical Output Apparatus therof |
| PCT/KR2017/000036 WO2017119692A1 (en) | 2016-01-05 | 2017-01-03 | 3d printer and optical output device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108472874A true CN108472874A (en) | 2018-08-31 |
Family
ID=59273803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780005853.6A Pending CN108472874A (en) | 2016-01-05 | 2017-01-03 | Three-dimensional printer and its light output arrangement |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101780928B1 (en) |
| CN (1) | CN108472874A (en) |
| WO (1) | WO2017119692A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102000922B1 (en) | 2017-08-31 | 2019-07-17 | 주식회사 디이엔티 | Laser beam sizing device of metal 3D printer |
| KR102018570B1 (en) | 2017-11-03 | 2019-09-06 | 주식회사 쓰리딜라이트 | Auto Leveling System for 3D printer |
| KR102188554B1 (en) | 2019-01-22 | 2020-12-09 | 주식회사 디이엔티 | Laser head optical axis distance adjustment device of metal 3D printer |
| KR102233026B1 (en) * | 2019-05-30 | 2021-03-30 | 주식회사 덴티스 | Method of operating electric load-reduced three dimensional printer |
| KR102102730B1 (en) * | 2019-10-02 | 2020-04-21 | 이형천 | Tower type 3d printer and construction method using the same |
| KR102310525B1 (en) * | 2019-11-29 | 2021-10-08 | 한국전자기술연구원 | Light source module for additive manufacturing and appratus for additive manufacturing comprising the same |
| KR102250986B1 (en) | 2020-02-25 | 2021-05-14 | 주식회사 디이엔티 | Laser head of nozzle unit for 3D printer |
| KR102514484B1 (en) * | 2021-03-23 | 2023-03-27 | 중앙대학교 산학협력단 | Attachments for surface shaping and treatment of 3D concrete printing |
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- 2017-01-03 WO PCT/KR2017/000036 patent/WO2017119692A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2017119692A1 (en) | 2017-07-13 |
| KR101780928B1 (en) | 2017-09-26 |
| KR20170082044A (en) | 2017-07-13 |
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Application publication date: 20180831 |