CN110103466B - Printing method of 3D printing structure - Google Patents
Printing method of 3D printing structure Download PDFInfo
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- CN110103466B CN110103466B CN201910518526.1A CN201910518526A CN110103466B CN 110103466 B CN110103466 B CN 110103466B CN 201910518526 A CN201910518526 A CN 201910518526A CN 110103466 B CN110103466 B CN 110103466B
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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
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
- B29C64/129—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask
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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
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/264—Arrangements for irradiation
- B29C64/286—Optical filters, e.g. masks
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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
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/357—Recycling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- 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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Health & Medical Sciences (AREA)
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Abstract
The invention discloses a 3D printing structure, which comprises a three-dimensional moving assembly, a supporting plate arranged at the output end of the three-dimensional moving assembly, a resin tank and a light projection system, wherein the resin tank is positioned below the supporting plate; the liquid feeding pump is connected with the liquid feeding hole pipeline, the liquid discharging pump is connected with the liquid discharging hole pipeline, and the container is connected with the liquid inlet of the liquid feeding pump and the liquid outlet of the liquid discharging pump through pipelines. Through the cooperation of each part, form the backward flow of uncured photosensitive resin between container and resin groove, retrench the process that the printing in-process platform reciprocated and adjusted, through the flow of uncured photosensitive resin, reduce the viscous force between the transparent projection district of resin groove and the model, be convenient for separation between the two, avoid the layer board atress too big model that leads to from droing on the layer board.
Description
Technical Field
The invention relates to chemical material packaging equipment, in particular to a printing method of a 3D printing structure.
Background
3D printing is one of the rapid prototyping technologies, which is a technology for constructing an object by using an adhesive material such as powdered metal or plastic based on a digital model file and by printing layer by layer.
In the prior art, after each layer is printed in 3d, a platform rises or falls, and then is cured by light, and then moves. It is noted that the photocuring process is usually completed in hundreds to thousands of milliseconds, and the printing time is more consumed in the stage moving process, which is subdivided, for example. Can be divided into: and (4) moving the platform, separating the solidified model from the exposure surface, and enabling the liquid printing material to flow into the gap to fill the gap. Conventional platform movement to ensure that the mold is sufficiently separated from the transparent lower surface of the cylinder and that the printing material is sufficiently flowed into this point, the platform is raised a little more, stopped, and then depressed. The 3D printing requires high precision, so that the moving speed of the platform cannot be too fast in order to ensure the precision, a large amount of printing time is wasted by the movement of the platform, the efficiency is low, in addition, the adhesion force between the model and the exposure surface is large by adopting the printing mode, the separation is difficult, and the model is easy to fall off from the supporting plate. The chinese utility model patent of application number 201820970360.8 discloses a 3D printing apparatus based on digital plain noodles is handled, only improves its printing precision through improving relevant structure according to its specification content and its fig. 2, and its printing mode does not change, still adopts the successive layer to print the drawing of patterns, throws away to have and prints efficiency slow, and the model breaks away from the problem of difficulty with the exposure face. There is a need for a printing method for 3D printing structures with high printing efficiency and easy separation of the model from the exposure surface.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a printing method of a 3D printing structure, which has high printing efficiency and is easy to separate a model from an exposure surface.
The purpose of the invention is realized by adopting the following technical scheme:
A3D printing structure comprises a three-dimensional moving assembly, a supporting plate arranged at the output end of the three-dimensional moving assembly, a resin tank and a light projection system, wherein the resin tank is positioned below the supporting plate; the liquid feeding pump is connected with the liquid feeding hole pipeline, the liquid discharging pump is connected with the liquid discharging hole pipeline, and the container is connected with the liquid inlet of the liquid feeding pump and the liquid outlet of the liquid discharging pump through pipelines.
In one embodiment of the invention, the three-dimensional moving assembly comprises a support and a moving platform arranged on the support, the moving platform can move in a three-dimensional direction relative to the support, and the supporting plate is fixed at the lower end of the moving platform.
In one embodiment of the present invention, the light projection system is a laser projection system.
In one embodiment of the invention, the liquid outlet hole is formed at the bottom of the resin tank and is positioned outside the transparent projection area.
In one embodiment of the invention, the liquid inlet hole is formed in the side wall of the resin tank.
In one embodiment of the invention, the top of the container is provided with an opening, the resin tank is mounted on the top of the container, the horizontal projection of the transparent projection area is located within the horizontal projection of the opening, and the light projection system is located within the container.
Furthermore, the device also comprises an annular light shielding plate, the lower end surface of the annular light shielding plate is connected with the light outlet of the light projection system, and the upper end surface of the annular light shielding plate is connected with the bottom of the resin groove corresponding to the transparent projection area.
The invention also provides a printing method of the 3D printing structure, which is characterized by comprising the following steps:
s1, injecting photosensitive resin into the resin tank, driving the supporting plate to move downwards by the three-dimensional moving assembly until the distance between the supporting plate and the transparent projection area of the resin tank is the preset printing thickness;
s2, opening the light projection system, and curing the photosensitive resin of the corresponding pattern after the light is emitted by the light projection system;
s3, starting a liquid outlet pump, and pumping uncured photosensitive resin from the resin tank into a container by the liquid outlet pump;
s4, driving the supporting plate to move upwards by a preset distance by the three-dimensional moving assembly;
s5, pumping the uncured photosensitive resin in the container into a resin tank by a liquid inlet pump;
s6, repeating the steps S2-S5 until the printing is completed.
In one embodiment of the present invention, the liquid outlet pump pumps out the uncured photosensitive resin in the resin tank in step S3.
In one embodiment of the present invention, the resin tank is in a vacuum state while the discharge pump pumps the uncured photosensitive resin.
Compared with the prior art, the invention has the beneficial effects that:
through the cooperation of all parts, the backflow of the uncured photosensitive resin is formed between the container and the resin tank, the process of reciprocating adjustment of the platform in the printing process is simplified, the viscous force between the transparent projection area of the resin tank and the model is reduced through the flowing of the uncured photosensitive resin, the separation of the transparent projection area and the model is convenient, and the model is prevented from falling off from the supporting plate due to overlarge stress of the supporting plate.
Drawings
Fig. 1 is a schematic view of a 3D printing structure of embodiment 1.
In the figure: 10. a support plate; 20. a resin tank; 201. a transparent projection area; 30. a light projection system; 40. a container; 501. a support; 502. a mobile platform; 60. an annular light shield.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1, a liquid inlet pump and a liquid outlet pump are omitted in the figure, and the embodiment provides a 3D printing structure, which includes a three-dimensional moving assembly, a supporting plate 10 installed at an output end of the three-dimensional moving assembly, a resin tank 20 located below the supporting plate 10, and a light projection system 30, wherein a transparent projection area 201 is formed in a local transparent manner in the resin tank 20, light emitted from the light projection system 30 passes through the transparent projection area 201 and irradiates the resin tank 20, and the resin tank 20 is respectively provided with a liquid inlet hole and a liquid outlet hole; the liquid feeding device also comprises a liquid feeding pump connected with the liquid feeding hole pipeline, a liquid discharging pump connected with the liquid discharging hole pipeline and a container 40, wherein a liquid inlet of the liquid feeding pump and a liquid outlet of the liquid discharging pump are respectively connected with the container 40 through pipelines.
The liquid outlet and the liquid inlet are respectively positioned on two opposite side walls of the resin tank 20, and the uncured photosensitive resin forms a flow in a larger range in the resin tank 20, so that the adhesive force between the model and the transparent projection area 201 is further reduced.
The number of the liquid outlet holes and the liquid inlet holes can be multiple.
The three-dimensional moving assembly comprises a support 501 and a moving platform 502 mounted on the support 501, wherein the moving platform 502 can move in three-dimensional direction relative to the support 501, and the pallet 10 is fixed at the lower end of the moving platform 502.
The three-dimensional moving components are connected to the moving platform 502 in a manner known in the art, such as by a slide and rail connection. The light projection system 30 is a prior art structure and will not be described in detail herein since it does not involve any improvement.
The light projection system 30 is a laser projection system 30, and in order to ensure the curing effect, the laser projection system 30 is used for curing, the laser penetrating power is strong, the energy is concentrated, the omnibearing heating and curing are carried out through the heat conduction between photosensitive resins and the strong penetrating power of the laser, and the curing uniformity of the model is good.
In order to improve the compactness of the 3D printing structure, the top of the container 40 is provided with an opening, the resin tank 20 is arranged at the top of the container 40, the horizontal projection of the transparent projection area 201 is positioned in the horizontal projection of the opening, and the light projection system 30 is positioned in the container 40.
To prevent the light projection system 30 from being permeated by the photosensitive resin, the light projection system 30 is previously sealed.
In order to prevent the light projection system 30 from curing the photosensitive resin in the container 40, the container further comprises an annular light shielding plate 60, a lower end surface of the annular light shielding plate 60 is connected with the light emitting position of the light projection system 30, and an upper end surface of the annular light shielding plate 60 is connected with the bottom of the resin groove 20 corresponding to the transparent projection area 201.
The printing method of the 3D printing structure is characterized by comprising the following steps of:
s1, injecting photosensitive resin into the resin tank 20, and driving the supporting plate 10 to move downwards by the three-dimensional moving assembly until the distance between the supporting plate 10 and the transparent projection area 201 of the resin tank 20 is the preset printing thickness;
s2, turning on the light projection system 30, and enabling the light projection system 30 to emit light to cure the photosensitive resin of the corresponding pattern;
s3, starting a liquid outlet pump, and pumping the uncured photosensitive resin from the resin tank 20 into the container 40 by the liquid outlet pump;
s4, driving the supporting plate 10 to move upwards by a preset distance by the three-dimensional moving assembly;
s5, pumping the uncured photosensitive resin in the container 40 into the resin tank 20 by the liquid inlet pump;
s6, repeating the steps S2-S5 until the printing is completed.
Each part in this embodiment can be used with intelligent control system ally oneself with usefulness, realizes automatic printing.
In the printing process, the OMEGASGD series strain gauge is attached to a moving platform 502 of a 3d printer, the adhesion between a test model and the transparent projection area 201 is tested, and the test principle is as follows: the resistance is changed due to the deformation of the strain gauge under the action of external force, the photosensitive resin is FullCure720, the printing radius is 3 cm of a circular base, the printing area is 28.26 square cm, and the demolding force required by printing is 8.1 Newton.
Example 2
The embodiment provides a 3D printing structure, which comprises a three-dimensional moving assembly, a supporting plate 10 arranged at the output end of the three-dimensional moving assembly, a resin tank 20 positioned below the supporting plate 10 and a light projection system 30, wherein the resin tank 20 is partially transparent to form a transparent projection area 201, the light emitted by the light projection system 30 irradiates the resin tank 20 through the transparent projection area 201, and the resin tank 20 is respectively provided with a liquid inlet hole and a liquid outlet hole; the liquid feeding device also comprises a liquid feeding pump connected with the liquid feeding hole pipeline, a liquid discharging pump connected with the liquid discharging hole pipeline and a container 40, wherein a liquid inlet of the liquid feeding pump and a liquid outlet of the liquid discharging pump are respectively connected with the container 40 through pipelines.
In order to ensure that the uncured photosensitive resin in the resin tank 20 is completely extracted, the uncured photosensitive resin is prevented from being adhered to the side surface of the cured photosensitive resin and being cured in the next curing process, burrs are prevented from being formed at the edge of the model, the processing precision of the model is ensured, the liquid outlet hole is formed in the bottom of the resin tank 20 and is positioned outside the transparent projection area 201.
The liquid inlet hole is formed in the side wall of the resin tank 20, and compared with the side wall formed in the tank bottom, the photosensitive resin flowing into the side wall has larger potential energy, so that larger impact force can be generated on the tank bottom, and the adhesive force between the model and the transparent projection area 201 is reduced.
The three-dimensional moving assembly comprises a support 501 and a moving platform 502 mounted on the support 501, wherein the moving platform 502 can move in three-dimensional direction relative to the support 501, and the pallet 10 is fixed at the lower end of the moving platform 502.
The light projection system 30 is a laser projection system 30.
The top of the container 40 is provided with an opening, the resin tank 20 is arranged on the top of the container 40, the horizontal projection of the transparent projection area 201 is positioned in the horizontal projection of the opening, and the light projection system 30 is positioned in the container 40.
To prevent the light projection system 30 from being permeated by the photosensitive resin, the light projection system 30 is previously sealed.
In order to prevent the light projection system 30 from curing the photosensitive resin in the container 40, the container further comprises an annular light shielding plate 60, a lower end surface of the annular light shielding plate 60 is connected with the light emitting position of the light projection system 30, and an upper end surface of the annular light shielding plate 60 is connected with the bottom of the resin groove 20 corresponding to the transparent projection area 201.
The printing method of the 3D printing structure is characterized by comprising the following steps of:
s1, injecting photosensitive resin into the resin tank 20, and driving the supporting plate 10 to move downwards by the three-dimensional moving assembly until the distance between the supporting plate 10 and the transparent projection area 201 of the resin tank 20 is the preset printing thickness;
s2, turning on the light projection system 30, and enabling the light projection system 30 to emit light to cure the photosensitive resin of the corresponding pattern;
s3, starting a liquid outlet pump, and pumping the uncured photosensitive resin from the resin tank 20 into the container 40 by the liquid outlet pump;
s4, driving the supporting plate 10 to move upwards by a preset distance by the three-dimensional moving assembly;
s5, pumping the uncured photosensitive resin in the container 40 into the resin tank 20 by the liquid inlet pump;
s6, repeating the steps S2-S5 until the printing is completed.
In order to prevent the uncured photosensitive resin from remaining on the edge of the mold, the liquid outlet pump pumps out the uncured photosensitive resin in the resin tank 20 in step S3, and the resin tank 20 is in a vacuum state while the liquid outlet pump pumps out the uncured photosensitive resin.
Comparative example
The 3D printing structure of this comparison example includes three-dimensional moving element, install in three-dimensional moving element's output port's layer board 10, be located resin tank 20 and light projection system 30 of layer board 10 below, and resin tank 20 is local transparent and forms transparent projection area 201, and light projection system 30 light-emitting shines in resin tank 20 through transparent projection area 201.
The light projection system 30 is a laser projection system 30.
To prevent the light projection system 30 from being permeated by the photosensitive resin, the light projection system 30 is previously sealed.
The light projection device further comprises an annular light shielding plate 60, the lower end face of the annular light shielding plate 60 is connected with the light outlet of the light projection system 30, and the upper end face of the annular light shielding plate 60 is connected with the bottom of the resin groove 20 corresponding to the transparent projection area 201.
The printing method of the 3D printing structure is characterized by comprising the following steps of:
s1, injecting photosensitive resin into the resin tank 20, and driving the supporting plate 10 to move downwards by the three-dimensional moving assembly until the distance between the supporting plate 10 and the transparent projection area 201 of the resin tank 20 is the preset printing thickness;
s2, turning on the light projection system 30, and enabling the light projection system 30 to emit light to cure the photosensitive resin of the corresponding pattern;
s3, the three-dimensional moving component drives the supporting plate 10 to move upwards, and after the photosensitive resin is leveled, the supporting plate 10 is driven to move downwards until the preset distance between the model and the transparent projection area 201 is reached;
s6, repeating the steps S2-S3 until the printing is completed.
In the printing process, the OMEGASGD series strain gauge is attached to a moving platform 502 of a 3d printer, the adhesion between a test model and the transparent projection area 201 is tested, and the test principle is as follows: the resistance is changed by the deformation of the strain gauge under the action of external force. The photosensitive resin was fullCure720, a circular base with a radius of 3 cm was printed, the print area was 28.26 square cm, and the release force required for printing was measured to be 3.26 newtons.
The above embodiments are only some of the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (3)
1. A printing method of a 3D printing structure is characterized by comprising the following steps:
s1, injecting photosensitive resin into the resin tank, driving the supporting plate to move downwards by the three-dimensional moving assembly until the distance between the supporting plate and the transparent projection area of the resin tank is the preset printing thickness;
s2, opening a light projection system, wherein the light projection system emits light and cures the photosensitive resin with corresponding patterns;
s3, starting a liquid outlet pump, wherein the liquid outlet pump pumps the uncured photosensitive resin from the resin tank into a container;
s4, driving the supporting plate to move upwards by a preset distance through the three-dimensional moving assembly;
s5, pumping the uncured photosensitive resin in the container into the resin tank by a liquid inlet pump;
s6, repeating the steps S2-S5 until the printing is completed.
2. The method for printing the 3D printing structure according to claim 1, wherein the liquid outlet pump pumps out uncured photosensitive resin in the resin tank in step S3.
3. The method of printing the 3D printed structure according to claim 2, wherein the resin tank is under vacuum while the liquid pump pumps the uncured photosensitive resin.
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| CN114147964B (en) * | 2020-09-08 | 2023-06-09 | 中国科学院福建物质结构研究所 | Active bearing tray of photo-curing 3D printer and photo-curing forming method |
| CN112654490B (en) * | 2020-11-29 | 2022-06-21 | 苏州铼赛智能科技有限公司 | Bottom exposure 3D printing equipment, control method and control system |
| CN112743830B (en) * | 2020-12-09 | 2022-10-14 | 安徽工程大学 | Photocuring 3D printer silo structure |
| CN112743831B (en) * | 2020-12-09 | 2022-11-22 | 安徽工程大学 | Double-material forming workbench assembly for DLP photocuring 3D printing |
| CN113927897B (en) * | 2021-09-18 | 2024-03-15 | 深圳摩方新材科技有限公司 | High-utilization-rate multi-material resin 3D printing system and method |
| CN114407366A (en) * | 2021-12-21 | 2022-04-29 | 上海联泰科技股份有限公司 | High-speed photocuring 3D printing bottom projection equipment and method |
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| WO2012106256A1 (en) * | 2011-01-31 | 2012-08-09 | Global Filtration Systems | Method and apparatus for making three-dimensional objects from multiple solidifiable materials |
| CN105856577B (en) * | 2016-06-21 | 2017-12-26 | 安徽机电职业技术学院 | A kind of photocureable rapid shaping machine |
| CN107199701A (en) * | 2017-07-12 | 2017-09-26 | 东莞市三维三打印科技有限公司 | Ultraviolet light solidifies 3D printer |
| CN109421259A (en) * | 2017-08-31 | 2019-03-05 | 无锡映型三维数字技术有限公司 | A kind of 3D printer accelerating solidfied material and anti-sticking UF membrane using air pressure change |
| CN107825704A (en) * | 2017-12-20 | 2018-03-23 | 河南龙璟科技有限公司 | A kind of thermostatic type photocuring 3D printer |
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