CN114801161A - Side 3D printing system and printing method - Google Patents
Side 3D printing system and printing method Download PDFInfo
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- CN114801161A CN114801161A CN202210352661.5A CN202210352661A CN114801161A CN 114801161 A CN114801161 A CN 114801161A CN 202210352661 A CN202210352661 A CN 202210352661A CN 114801161 A CN114801161 A CN 114801161A
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- 238000007639 printing Methods 0.000 title claims abstract description 58
- 238000010146 3D printing Methods 0.000 title claims abstract description 35
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- 229920005989 resin Polymers 0.000 claims abstract description 106
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- 239000007788 liquid Substances 0.000 claims abstract description 21
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- 238000003825 pressing Methods 0.000 claims description 15
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
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- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 4
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 claims description 4
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
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Images
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
- 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
-
- 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
-
- 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
- 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
- B33Y10/00—Processes of additive manufacturing
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
Abstract
The invention provides a side 3D printing system and a printing method, wherein the system comprises: the device comprises a resin tank, wherein a forming platform and a release film are arranged in the resin tank, the release film is positioned on the side surface of the resin tank, and the release film is tightly combined with the resin tank and is vertical to the liquid level of resin in the resin tank; the forming platform and the release film are arranged in parallel; the optical system is used for projecting a two-dimensional pattern and projecting the two-dimensional pattern to an interface between the release film and the resin in the resin tank along a direction parallel to the release film; the motion system is connected with the forming platform and is used for driving the forming platform to transversely move along the Y axis; and the control module is used for controlling the movement of the movement system according to the printing process. The printing method is realized based on the side 3D printing system. The invention is beneficial to improving the printing precision, can realize the printing of the microfluidic chip of the integrated closed pipeline and the interface, and has the advantages of high printing speed and low cost.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a side 3D printing system and a printing method.
Background
3D printing, also known as additive manufacturing or rapid prototyping, is a technology fundamentally different from conventional manufacturing processes. Generally, the 3D printing process includes three steps: firstly, designing a three-dimensional model by using computer modeling software; secondly, slicing the three-dimensional model; finally, the model structure is printed layer by layer. The 3D printing technology has important application in the fields of micro-nano manufacturing, micro-fluidic chips, bionic organs and the like at present, so that various printing methods are developed, wherein the 3D printing technology based on surface projection has comprehensive advantages in the aspects of equipment cost, printing precision, printing speed and the like. The core of the surface projection technology lies in illumination equipment such as a Digital Light Processing (DLP) and a Liquid Crystal Display (LCD), which are formed into a surface in a single step, and the Liquid photosensitive resin is used as a material, and the material is cured and superposed into a three-dimensional object after being illuminated layer by layer. Two types of surface projection technologies, which are currently common, are bottom exposure type and top exposure type printing technologies, respectively, according to the position of the light source relative to the resin tank. The lower exposure printing system is common, the light curing always occurs between the bottom surface of the resin tank and the cured part, the layer to be cured is always a restraining liquid level, and the cured part gradually rises along with the printing platform. However, when printing three-dimensional objects, the separation force between layers is large, which easily causes the damage of the cured part and even the damage of the optical window at the bottom of the resin tank, and the reciprocating motion causes the reduction of the printing speed and precision, so the anti-adhesion treatment is often required to be performed on the bottom surface of the resin tank. In addition to the sticking problem, another problem of the bottom exposure type printing technique is that the shielding of the printing stage causes bubbles to be difficult to be discharged upward; the single-layer curing molding of the upper exposure type 3D printing technology always occurs between a cured part and an air interface, the trouble of bottom adhesion is avoided, and therefore the vertical reciprocating motion is not needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a side 3D printing system and a printing method, which can improve the printing precision and have the advantages of high printing speed and low cost.
The invention is realized by the following technical scheme:
according to an aspect of the present invention, there is provided a side 3D printing system comprising:
the mold comprises a resin tank, wherein a molding platform and a release film are arranged in the resin tank, the release film is positioned on the side surface of the resin tank, and the release film is tightly combined with the resin tank and is vertical to the liquid level of resin in the resin tank; the forming platform and the release film are arranged in parallel;
the optical system is used for projecting a two-dimensional pattern and projecting the two-dimensional pattern to an interface between the release film and the resin in the resin tank along a direction parallel to the release film;
the motion system is connected with the forming platform and is used for driving the forming platform to transversely move along the Y axis;
and the control module is used for controlling the movement of the movement system according to the printing process.
Furthermore, a groove is formed in the side face of the resin tank, the periphery of the release film is located in the groove, a film pressing plate is arranged on one side, away from the resin tank, of the release film, the film pressing plate is fixedly connected with the side face of the resin tank, and the release film forms a flat and tight film face under the extrusion of the resin tank and the film pressing plate.
Furthermore, a first screw hole position is arranged on the film pressing plate, a second screw hole position corresponding to the first screw hole position is arranged on the resin groove, and screws sequentially penetrate through the first screw hole position and the second screw hole position to fix the film pressing plate on the resin groove.
Further, the release film is configured to have both easy peelability and high light transmittance.
Further, the material of the release film is selected from any one of polydimethylsiloxane, teflon and soluble polytetrafluoroethylene.
Further, an oxygen pool for increasing the oxygen transmission amount is arranged on one side, away from the resin tank, of the release film.
Further, the optical system comprises a light source for projecting the two-dimensional pattern, and the light source is a DLP light projector or a liquid crystal display projector.
Furthermore, the motion system comprises a motion shaft along the Y axis and a connecting rod perpendicular to the motion shaft, one end of the connecting rod is connected with the motion shaft, and the other end of the connecting rod is fixedly connected with the forming platform.
Further, after a layer of resin is cured in the printing process, the control module controls to close the light source of the optical system and controls the motion system to drive the forming platform to move along the direction away from the release film; after the forming platform is stabilized, the control module further controls the motion system to drive the forming platform to move along the direction close to the release film, and the thickness of the next layer is reserved.
According to another aspect of the present invention, there is provided a side 3D printing method implemented based on the above side 3D printing system, the method including:
acquiring a three-dimensional model of an object to be printed, and cutting the three-dimensional model into a series of two-dimensional patterns;
projecting the two-dimensional patterns in sequence by using an optical system, and irradiating the two-dimensional patterns to an interface between the release film and the resin in the resin tank;
curing the resin thin layer by utilizing illumination to finish the printing of the current layer;
then the control module closes the light source of the optical system and enables the forming platform to move along the direction away from the release film, so that the cured part is separated from the release film;
then the forming platform moves along the direction close to the release film, and the thickness of the next layer is reserved, so that the layer to be cured is always positioned between the cured part and the release film;
and sequentially exposing the two-dimensional patterns, and repeating the operation to finish printing the object to be printed.
Compared with the prior art, the invention has the following beneficial effects:
according to the side 3D printing system and the printing method, the release film and the forming platform are perpendicular to the liquid level of the resin, so that floating of bubbles is not blocked, bubbles generated in liquid can be discharged conveniently, and the fidelity and the integrity of a printed object compared with a model are improved. The invention can realize the printing of the microfluidic chip of the integrated closed pipeline and the interface, and has the advantages of high printing speed and low cost. The invention can be applied to the fields of drug screening, new drug development, bionic organs, biological medicine and the like, and has wide application scenes.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural diagram of a side 3D printing system according to an embodiment of the invention;
FIG. 2 is a schematic view illustrating the installation of a release film according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a side 3D printing method according to an embodiment of the present invention.
In the figure: the device comprises a light source 1, an objective lens 2, a barrel lens 3, a release film 4, a resin tank 5, a forming platform 6, a connecting rod 7, a moving shaft 8, a film pressing plate 9, a first screw hole position 10 and a second screw hole position 11.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention. In the description of the embodiments of the present invention, it should be noted that the terms "first", "second", and the like in the description and the claims of the present invention and the drawings described above are used for distinguishing similar objects and not necessarily for describing a particular order or sequence. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
An embodiment of the present invention provides a side 3D printing system, referring to fig. 1, where g represents a gravity direction, the system including: the mold comprises a resin tank 5, wherein a molding platform 6 and a release film 4 are arranged in the resin tank 5, the release film 4 is positioned on the side surface of the resin tank 5, the release film 4 is tightly combined with the resin tank 5 and is vertical to the liquid level of resin in the resin tank 5, namely the placement of the release film 4 is the same as the gravity direction; the forming platform 6 is arranged in parallel with the release film 4; an optical system for projecting the two-dimensional pattern and projecting the two-dimensional pattern to an interface between the release film 4 and the resin in the resin tank 5 in a direction parallel to the release film 4; the motion system is connected with the forming platform 6, arranged in the horizontal direction and used for driving the forming platform 6 to transversely move along the Y axis, namely to move left and right perpendicular to the surface of the release film 4; and the control module is used for controlling the movement of the movement system according to the printing process. The photosensitive resin may be dissolved in air during the preparation and printing processes, and bubbles may be generated by the movement of the forming platform 6 and the photocuring process liquid during printing. Because the release film 4 and the forming platform 6 are perpendicular to the liquid level of the resin in the side printing system, the floating of bubbles can not be shielded, so that the bubbles generated in the liquid can be conveniently discharged, and the printing precision can be improved. Because the release film is positioned on the side surface and is not influenced by the gravity of the liquid resin material, the thinner release film can be selected, and the oxygen transmission capacity is increased to realize continuous printing.
In some preferred embodiments, a groove is formed in a side surface of the resin tank 5, the groove is reserved for the resin tank 5, the periphery of the release film 4 is arranged in the groove, the side surface is provided with an opening, the release film 4 covers the opening to serve as a side wall of the resin tank 5, one side of the release film 4 is positioned in the resin liquid and is perpendicular to the resin liquid surface, and therefore air bubbles generated in the printing process can be discharged; the other side of the release film 4 remains dry. Be equipped with film clamp plate 9 from one side that resin tank 5 was kept away from to type membrane 4, film clamp plate 9 and resin tank 5's side fixed connection, film clamp plate 9 also is located the recess that resin tank 5 was reserved, is fixed in the middle of 5 sides of resin tank and film clamp plate 9 from type membrane 4, forms the face of level and smooth tight membrane from type membrane 4 under the extrusion of resin tank 5 and film clamp plate 9.
In order to mount the release film 4, in some preferred embodiments, referring to the mounting schematic diagram of the release film 4 in fig. 2, a first screw hole position 10 is provided on the film pressing plate 9, a second screw hole position 11 corresponding to the first screw hole position 10 is provided on the resin tank 5, and screws sequentially pass through the first screw hole position 10 and the second screw hole position 11, so as to fix the film pressing plate 9 on the resin tank 5. The installation process of the release film 4 specifically comprises: the release film 4 covers the side face of the resin tank 5, the thin film pressing plate 9 is covered, screws are installed in the first screw hole positions 10 and the second screw hole positions 11 and are pressed tightly, the release film 4 forms a vertical and flat film surface under the extrusion of the thin film pressing plate 9 and the resin tank 5, and one side of the film surface is adjacent to the resin liquid in the resin tank 5.
The release film 4 is used mainly for allowing the resin material to be cured by ultraviolet light, and is easily peeled from the cured object to prevent the printed matter from being damaged. And simultaneously, the thickness of each layer of resin in the printing process is accurately controlled by using a constraint interface formed by the film and the forming platform 6. In some preferred embodiments, the release film 4 has good release properties and has high light transmittance to ensure molding speed. The release film 4 is positioned on the side surface of the resin tank 5, is tightly combined with the resin tank 5 to avoid liquid leakage, is vertical to the liquid level of the resin, and is beneficial to discharging bubbles generated in the printing process. In addition, the release film 4 is parallel to the gravity direction, and a thinner film can be used to increase the oxygen permeation amount and reduce the adhesion condition without bearing the gravity of the resin.
In order to provide the release film 4 with both easy peelability and high light transmittance, in some preferred embodiments, the material of the release film 4 is selected from any one of Polydimethylsiloxane (PDMS), teflon and soluble Polytetrafluoroethylene (PFA). Of course, in other embodiments, other kinds of materials may be used as long as the same function as in the embodiments of the present invention can be achieved.
In order to increase the oxygen transmission, in some preferred embodiments, an oxygen reservoir is provided on the side of the release film 4 away from the resin tank 5 to achieve continuous printing.
In some preferred embodiments, the optical system includes a light source 1, an objective lens 2, and a barrel mirror 3, the objective lens 2 is used for magnifying the two-dimensional image, and the barrel mirror 3 is used for projecting the magnified two-dimensional image to the interface of the release film 4 and the resin in the resin tank 5. The computer slices the digital model to generate a two-dimensional projection sequence, namely a two-dimensional pattern, the light source 1 transmits the two-dimensional pattern to the objective lens 2 and the cylindrical lens 3 in sequence, and the generated image finally irradiates the interface between the release film 4 and the resin in the resin tank 5. It should be noted that there are many ways to select the optical system, and in other embodiments, a person skilled in the art may select other types of optical paths according to actual needs as long as the same function as that of the present invention can be achieved, and the embodiments of the present invention are not limited to this.
In some preferred embodiments, the light source of the optical system is a DLP projector or a liquid crystal screen projector. The DLP projector realizes image display based on Digital Micromirror Device (DMD), and projects the image signal after digital processing. The liquid crystal screen projector is driven by a computer and a display screen circuit, an image signal is provided by a computer program, a selective transparent area appears on a liquid crystal screen, and ultraviolet light penetrates through the transparent area to irradiate photosensitive resin in a resin tank 5. Compare with the inside liquid crystal chip of LCD screen projecting apparatus, digital micro mirror element DMD in the DLP projecting apparatus is that the ultraviolet compatibility of DLP chip is better, and has higher contrast. In some embodiments, the DLP projector uses DLP 4500 optical engine of shanghai level technology, with a theoretical resolution of 1280 × 800 and a size of 7.56um × 7.56um, and the projection optical engine is small and convenient to install. The light source used was an ultraviolet LED with a power of 30W and a wavelength of 405 nm. Of course, in other embodiments, other types of light sources can be used by those skilled in the art, as long as the same function as in the present invention can be achieved.
In some preferred embodiments, the motion system comprises a motion shaft 8 along the Y-axis and a connecting rod 7 arranged perpendicular to the motion shaft 8, one end of the connecting rod 7 is connected with the motion shaft 8, and the other end of the connecting rod 7 is fixedly connected with the forming platform 6. The motion shaft 8 drives the forming platform 6 to move left and right along the Y axis through the connecting rod 7. After the curing of a layer of resin is finished in the printing process, the control module controls to close the light source of the optical system and controls the motion system to drive the forming platform 6 to move along the direction away from the release film 4 so as to separate the cured part from the release film 4; the stable back control module still controls movement system and drives forming platform 6 to remove along the direction that is close to from type membrane 4 to reserve the thickness of next layer, make the layer of waiting to solidify all the time be located the solidification part with from between the type membrane 4. Of course, in other embodiments, those skilled in the art can also use other structures of the motion system, as long as the same function as the present invention can be achieved.
The embodiment of the invention also provides a side 3D printing method, which is realized based on the side 3D printing system in the embodiment, and comprises the following steps:
acquiring a three-dimensional model of an object to be printed, and cutting the three-dimensional model into a series of two-dimensional patterns;
projecting two-dimensional patterns in sequence by using an optical system, and irradiating the two-dimensional patterns to an interface between the release film and the resin in the resin tank;
curing the resin thin layer by utilizing illumination to finish the printing of the current layer;
then the control module closes the light source of the optical system and enables the forming platform to move along the direction away from the release film, so that the cured part is separated from the release film;
then the forming platform moves along the direction close to the release film, and the thickness of the next layer is reserved, so that the layer to be cured is always positioned between the cured part and the release film;
and sequentially exposing the two-dimensional patterns, and repeating the operation to finish the printing of the object to be printed.
In some preferred embodiments, the side 3D printing method includes the following specific processes:
a three-dimensional model of an object to be printed is built by using a computer, and a thin column or other thin supporting structures can be properly added to a suspended structure in the modeling process. Using the slicing software or program, the three-dimensional object model is sliced along the slicing axis into a series of two-dimensional pictures, the slicing direction being the print direction of the printer. The picture is a two-dimensional black and white image, or may have a gray scale, with each two-dimensional picture representing a thin layer of the model along the slice axis. And the computer reads all the two-dimensional pictures along the slicing direction in sequence, and the two-dimensional patterns are projected in sequence by using the light source and are irradiated to the interface between the release film and the resin in the resin tank through the projection lens. The method is based on a layer-by-layer curing mode to complete the printing of the whole three-dimensional object, so that slices are cut according to the printing direction, and each thin resin layer corresponds to one slice in the actual printing process; after the curing of one layer of resin is completed, namely the printing of the current layer is completed, the control module closes the light source and controls the forming platform to move rightwards, namely to move 0.6-1mm away from the release film, so that the cured layer and the release film are peeled off, then the forming platform moves leftwards, namely to move towards the direction close to the release film, the left distance is just the thickness of the next layer, and the liquid resin required for printing the next layer is just filled in the gap between the cured object and the release film, as shown in fig. 3; it should be noted that after the forming platform is controlled to move to the right for a certain distance, the forming platform needs to wait for completing the movement, so as to avoid the conflict caused by the fact that the former process does not complete the next command and sends out the next command; in addition, because there is the adhesion between type membrane and the object that has solidified, need rely on the pulling force that the shaping platform right shift produced to make the two peel off, 0.6-1mm is giving consideration to printing time and peeling effect setting, the distance that moves right is longer, the more time that makes a round trip to consume also can be longer for natural printing time, for shortening printing time as far as possible, the distance that moves right will be short enough, but because of having certain degree elasticity from the type membrane, the distance that moves right is too short again can't peel off, in the actual process, the distance that moves right can be adjusted according to specific experimentation. And repeating the process in a circulating way, and completing printing of the three-dimensional object model to be printed in the resin tank along with the layer-by-layer right movement of the forming platform.
When the air bubbles exist, the positions corresponding to the liquid resin are not provided with the resin, the material is lack, the air bubbles are not solidified by illumination, and the actually printed objects are incomplete. In the lateral 3D printing system and the printing method in the above embodiments of the present invention, since the release film and the forming platform are both perpendicular to the liquid surface of the resin, and do not block the floating of the bubbles, bubbles generated in the liquid can be conveniently discharged, which is beneficial to improving the fidelity and integrity of the printed object compared to the model. The invention can realize the printing of the microfluidic chip of the integrated closed pipeline and the interface, and has the advantages of high printing speed and low cost. The invention preliminarily verifies the application of the future side 3D printing technology in the micro-fluidic chip technology and micro-manufacturing, and provides a new technical route for the micro-manufacturing field of rapidly manufacturing the micro-fluidic chip and the like in the future.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The above-described preferred features may be used in any combination without conflict with each other.
Claims (10)
1. A lateral 3D printing system, comprising:
the mold comprises a resin tank, wherein a molding platform and a release film are arranged in the resin tank, the release film is positioned on the side surface of the resin tank, and the release film is tightly combined with the resin tank and is vertical to the liquid level of resin in the resin tank; the forming platform and the release film are arranged in parallel;
the optical system is used for projecting a two-dimensional pattern and projecting the two-dimensional pattern to an interface between the release film and the resin in the resin tank along a direction parallel to the release film;
the motion system is connected with the forming platform and is used for driving the forming platform to transversely move along the Y axis;
and the control module is used for controlling the movement of the movement system according to the printing process.
2. The lateral 3D printing system according to claim 1, wherein a groove is formed in a lateral surface of the resin tank, the periphery of the release film is located in the groove, a thin film pressing plate is arranged on a side of the release film away from the resin tank, the thin film pressing plate is fixedly connected with the lateral surface of the resin tank, and the release film forms a flat and tight film surface under the extrusion of the resin tank and the thin film pressing plate.
3. The lateral 3D printing system of claim 2, wherein a first screw hole site is provided on the film pressing plate, a second screw hole site corresponding to the first screw hole site is provided on the resin tank, and screws sequentially pass through the first screw hole site and the second screw hole site to fix the film pressing plate on the resin tank.
4. The lateral 3D printing system of claim 1, wherein the release film is configured to have both easy-peeling property and high light transmittance.
5. The lateral 3D printing system of claim 1, wherein the release film is made of a material selected from any one of polydimethylsiloxane, teflon, and soluble polytetrafluoroethylene.
6. The lateral 3D printing system according to claim 1, wherein an oxygen reservoir for increasing an oxygen transmission amount is provided on a side of the release film away from the resin tank.
7. The lateral 3D printing system of claim 1, wherein the optical system comprises a light source for projecting a two-dimensional pattern, the light source being a DLP light projector or a liquid crystal screen projector.
8. The lateral 3D printing system of claim 1, wherein the motion system comprises a motion axis along a Y-axis and a connecting rod perpendicular to the motion axis, one end of the connecting rod is connected to the motion axis, and the other end of the connecting rod is fixedly connected to the forming platform.
9. The lateral 3D printing system of claim 1, wherein after a layer of resin is cured during printing, the control module controls to turn off a light source of the optical system and controls the motion system to drive the forming platform to move in a direction away from the release film; after the forming platform is stabilized, the control module further controls the motion system to drive the forming platform to move along the direction close to the release film, and the thickness of the next layer is reserved.
10. A side 3D printing method implemented based on the side 3D printing system according to any one of claims 1 to 9, comprising:
acquiring a three-dimensional model of an object to be printed, and cutting the three-dimensional model into a series of two-dimensional patterns;
projecting the two-dimensional patterns in sequence by using an optical system, and irradiating the two-dimensional patterns to an interface between the release film and the resin in the resin tank;
curing the resin thin layer by utilizing illumination to finish the printing of the current layer;
then the control module closes the light source of the optical system and enables the forming platform to move along the direction away from the release film, so that the cured part is separated from the release film;
then the forming platform moves along the direction close to the release film, and the thickness of the next layer is reserved, so that the layer to be cured is always positioned between the cured part and the release film;
and sequentially exposing the two-dimensional patterns, and repeating the operation to finish printing the object to be printed.
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