WO2020001100A1 - Système d'impression tridimensionnelle et méthode d'impression associée - Google Patents

Système d'impression tridimensionnelle et méthode d'impression associée Download PDF

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Publication number
WO2020001100A1
WO2020001100A1 PCT/CN2019/079770 CN2019079770W WO2020001100A1 WO 2020001100 A1 WO2020001100 A1 WO 2020001100A1 CN 2019079770 W CN2019079770 W CN 2019079770W WO 2020001100 A1 WO2020001100 A1 WO 2020001100A1
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WO
WIPO (PCT)
Prior art keywords
irradiation
powder material
resin powder
resin
dimensional printing
Prior art date
Application number
PCT/CN2019/079770
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English (en)
Chinese (zh)
Inventor
苏健强
Original Assignee
珠海天威飞马打印耗材有限公司
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Publication of WO2020001100A1 publication Critical patent/WO2020001100A1/fr

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Classifications

    • 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
    • B29C64/141—Processes of additive manufacturing using only solid materials
    • B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
    • 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
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B29C64/264—Arrangements for irradiation
    • B29C64/277—Arrangements for irradiation using multiple radiation means, e.g. micromirrors or multiple light-emitting diodes [LED]
    • 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

Definitions

  • the invention relates to the technical field of three-dimensional printing, and in particular to a three-dimensional printing system and a printing method thereof, which realize fast and high-precision printing of resin powder materials through material discoloration.
  • Three-dimensional (3D) rapid prototyping also known as additive manufacturing, is based on the principle of forming three-dimensional objects by printing or laying continuous layers of material.
  • a 3D rapid prototyping device or a 3D printer usually works by converting a 3D computer model of an object and generating a series of cross-section slices, then printing each slice, and printing and forming a 3D object by overlapping each slice.
  • the existing Chinese patent application with the number of 201580079600.4 discloses three-dimensional printing technology and printing method using thermally-assisted sintering, including: applying a construction material composition, the construction material composition having polymer particles, and a polymer particle mixed with the polymer particles.
  • the radiation-absorbing additive is selected from the group consisting of an inorganic near-infrared absorber, an organic near-infrared absorber, and a combination thereof.
  • Pre-heating the construction material composition to a temperature below the melting temperature of the polymer particles by exposing the construction material composition to radiation the radiation-absorbing additive will increase radiation absorption and accelerate the pre-heating of the construction material composition.
  • a flux is then selectively applied to at least a portion of the construction material composition, and the construction material composition is further exposed to radiation, thereby at least partially fusing the polymer particles in at least a portion of the construction material composition in contact with the flux. .
  • polymer particles are mixed with an additive that absorbs radiation, that is, polymer particles need to be combined with the additive before molding and curing. Due to compatibility and other issues, the combination of different materials during the molding process will affect the molding. The molding effect of the material; in addition, it is necessary to apply a flux to the structural molding material to achieve three-dimensional molding. The selective application of the flux will also affect the printing efficiency and printing effect.
  • a first object of the present invention is to provide a three-dimensional printing system for realizing a three-dimensional molding method with higher printing accuracy and printing efficiency.
  • a second object of the present invention is to provide a three-dimensional molding method having higher printing accuracy and printing efficiency.
  • the present invention provides a three-dimensional printing system.
  • the three-dimensional printing system includes a printing platform for placing a resin powder material, and the resin powder material can be processed from a light to a dark color after being processed under a first irradiation condition.
  • the laying mechanism the laying mechanism is used to uniformly lay the resin powder material on the printing platform;
  • the preheating mechanism the preheating mechanism is used to pre-resin the resin powder material Heat to a temperature close to and below the melting point of the resin powder material;
  • a first irradiation mechanism for applying a first irradiation condition to at least a portion of the resin powder material;
  • a second irradiation mechanism for applying a resin to the resin The powder material is subjected to a second irradiation condition.
  • the three-dimensional printing system of the invention does not need to add additional radiation-absorbing additives and fluxes, avoids the problems caused by the combination of additives and resins, improves the printing effect, and improves the printing efficiency.
  • the invention preheats the resin powder material to a temperature close to but below the melting point by a preheating mechanism; the first irradiation mechanism selectively applies a first irradiation condition to at least a part of the resin powder material, so that the resin powder material subjected to the first irradiation condition The color becomes darker, but the color of the resin powder material that has not been subjected to the first irradiation condition does not change; the second irradiation mechanism applies the second irradiation condition to the resin powder material, so that the resin powder material that becomes darker is solidified, and the resin powder that does not change color The material does not stick and cure due to less heat absorbed.
  • the invention uses the characteristics of the melting point and discoloration of the material, and realizes fast and high-precision printing of the resin powder material through preheating and double irradiation.
  • the printing area and printing speed can be adjusted by controlling the irradiation conditions, which improves printing efficiency and reduces printing costs.
  • the resin powder material of the present invention is selected from resin powder materials that can be thermochromic or photochromic, and it is preferable that the resin powder material whose original color is a light color such as white or transparent.
  • the preheating mechanism can preheat the resin powder material by means of heat transfer or the like.
  • the first irradiation mechanism and the second irradiation mechanism may be selected from known irradiation mechanisms in the art or other irradiation mechanisms capable of providing specific irradiation conditions. As long as it is ensured that the resin powder material can be changed from light to dark under the first irradiation condition, and the resin powder material that has become darker can be cured under the second irradiation condition. "Curing” means that the resin powder materials are bonded to each other to form a solid, the resin powder materials are fused, and in some cases, the powder materials are reactively connected to each other.
  • the resin powder material includes a color changing resin; or the resin powder material includes a resin and a color changing additive.
  • the resin powder material of the present invention may include a discoloration resin that can be thermochromic or photochromic in itself.
  • the thermochromic resin can raise the discoloration resin by a first irradiation condition matched with it, such as infrared radiation of a certain wavelength. Temperature, thereby making the resin color darker; the photochromic resin can be darkened by the first irradiation condition matched with it, such as ultraviolet radiation.
  • the thermochromic resin or the photochromic resin may adopt an existing discoloration resin, or introduce a discoloration group into the resin to obtain a discoloration resin.
  • the resin powder material of the present invention may further include a resin and a discoloration additive.
  • the resin is preferably transparent or light-colored, such as a white resin. A single resin type is preferably used to determine the melting point and increase the degree of fusion between the resin powders.
  • the discoloration additive may be Color change additives or other improved color change additives known in the art.
  • a further technical solution is that when the resin powder material includes a resin and a color changing additive, the resin is nylon, polycarbonate, or ABS; the color changing additive includes at least one of an organic color changing additive and an inorganic color changing additive; and the organic color changing additive includes spiropy At least one of a sulfan compound and an azobenzene compound, and the inorganic discoloration additive is a metal halide or a mixture of a metal halide and a catalyst.
  • the resin powder material When the resin powder material is selected to include a resin and a discoloration additive, the resin may be selected from a resin material such as nylon, polycarbonate, or ABS (acrylonitrile-butadiene-styrene terpolymer). These materials have low cost, Light color or transparent, stable performance and other advantages.
  • the discoloration additive is preferably an organic discoloration additive such as a spiropyran compound or an azobenzene compound, or an inorganic discoloration additive such as a metal halide such as silver halide or silver bromide.
  • the metal halide may also interact with a catalyst such as copper oxide or stannous oxide. Mixture, these discoloration additives make the color of the resin powder material changed easily under the second irradiation condition, and the maintenance time after discoloration is conducive to the progress of curing.
  • the three-dimensional printing system further includes a control device for controlling the operation of the laying mechanism, the preheating mechanism, the first irradiation mechanism, and the second irradiation mechanism.
  • the preheating mechanism is set in the printing platform.
  • the invention can also use the control device to precisely control the work of each mechanism in the printing process, thereby further improving the printing accuracy.
  • the preheating mechanism can be set in the printing platform to provide preheating heat to the resin powder material through the printing platform, or the preheating mechanism can be set elsewhere in the molding cavity of the printing system of the printing platform, independently of the printing platform.
  • the resin powder material provides preheating heat.
  • the first irradiation mechanism is disposed above one side of the platform; the first irradiation mechanism includes DLP equipment, LCD equipment or blue light equipment; the first irradiation condition is blue light irradiation or ultraviolet light irradiation; the second irradiation mechanism is provided on the platform Above the middle; the second irradiation mechanism is an infrared irradiation device; the second irradiation condition is near-infrared irradiation, middle-infrared irradiation, or far-infrared irradiation.
  • the first irradiation mechanism and the second irradiation mechanism of the present invention can be respectively disposed at different positions on the printing platform.
  • the first irradiation mechanism can apply the first irradiation condition to the resin powder material on the printing platform from the side, and the second irradiation mechanism can be from above.
  • the second irradiation condition is applied to the resin powder material on the printing platform.
  • the first irradiation mechanism and the second irradiation mechanism do not need to move, thereby further improving printing efficiency.
  • the first irradiation mechanism can select different selectively irradiating equipment according to the requirements of energy.
  • the second irradiating mechanism is preferably an infrared light irradiating device, which utilizes the characteristics of thermal energy generated by infrared to heat up quickly and efficiently to irradiate the resin powder material.
  • Infrared can select near infrared with a wavelength of 0.75 to 2.0 ⁇ m and mid-infrared with a wavelength of 2.0 to 4.0 ⁇ m And light of different wavelengths in far infrared rays with a wavelength of 4.0 to 1000 ⁇ m.
  • the present invention provides a three-dimensional printing method.
  • the three-dimensional printing method is performed by a three-dimensional printing system.
  • the three-dimensional printing system includes a printing platform, a laying mechanism, a preheating mechanism, a first irradiation mechanism, and a second irradiation mechanism.
  • the three-dimensional printing method includes: step one: uniformly laying the resin powder material on the printing platform through a laying mechanism; step two: preheating the resin powder material to a temperature close to and lower than the melting point of the resin powder material through a preheating mechanism; step three: The first irradiation condition is applied to at least a part of the resin powder material through a first irradiation mechanism, and the resin powder material is processed from the first irradiation condition to change its color from light to dark.
  • Step 4 The second irradiation mechanism is applied to the three-dimensionally molded resin powder material. Irradiation conditions, the three-dimensionally shaped resin powder material that becomes darker is cured under the second irradiation condition; step five: repeat steps one to four until printing of the three-dimensional object is completed; step six: remove the uncured resin powder material.
  • the invention provides a three-dimensional printing method performed in the above-mentioned three-dimensional printing system, accurately utilizes the melting point of the molding material and the material discoloration characteristics, and realizes the rapid and the High-precision printing. By laying the resin powder layer by layer for curing, the desired three-dimensional solid can be obtained.
  • the resin powder material includes a color changing resin; or the powder material includes a resin and a color changing additive.
  • the resin is nylon, polycarbonate or ABS;
  • the discoloration additive includes at least one of an organic discoloration additive and an inorganic discoloration additive;
  • the organic discoloration additive includes a spiropyran compound and an azobenzene compound.
  • At least one of the inorganic discoloration additives is a metal halide or a mixture of a metal halide and a catalyst.
  • a further technical solution is that a preheating mechanism is disposed in the platform.
  • the three-dimensional printing system further includes a control device, and the control device controls the laying mechanism, the preheating mechanism, the first irradiation mechanism, and the second irradiation mechanism to perform steps 1 to 4.
  • the first irradiation mechanism is disposed above one side of the platform; the first irradiation mechanism includes DLP equipment, LCD equipment or blue light equipment; the first irradiation condition is blue light irradiation or ultraviolet light irradiation; and the second irradiation mechanism is provided Above the middle of the platform; the second irradiation mechanism is an infrared irradiation device; the second irradiation condition is near-infrared irradiation, middle-infrared irradiation, or far-infrared irradiation.
  • the three-dimensional printing system of the invention does not need to add additional radiation-absorbing additives and fluxes, avoids the problems caused by the combination of additives and resins, improves the printing effect, and improves the printing efficiency.
  • the invention uses the characteristics of the melting point and discoloration of the material, and realizes fast and high-precision printing of the resin powder material through preheating and double irradiation.
  • the printing area and printing speed can be adjusted by controlling the irradiation conditions, which improves printing efficiency and reduces printing costs.
  • FIG. 1 is a schematic structural diagram of an embodiment of a three-dimensional printing system according to the present invention.
  • FIG. 2 is a schematic diagram of a light processing and color changing step in an embodiment of a three-dimensional printing method according to the present invention
  • FIG. 2 (a) is a schematic view before the light processing and color changing
  • FIG. 2 (b) is a schematic view after the light processing and color changing;
  • FIG. 3 is a schematic diagram of selecting a curing position in a light processing and color changing step in an embodiment of a three-dimensional printing method according to the present invention
  • FIG. 4 is a schematic diagram of a photo-curing step in an embodiment of a three-dimensional printing method according to the present invention.
  • FIG. 1 The structure of the three-dimensional printing system of this embodiment is shown in FIG. 1, and includes a printing platform 1, a laying mechanism 2, a preheating mechanism, a first irradiation mechanism 3, a second irradiation mechanism 4, and a control device 5.
  • the laying mechanism 2 is located on one side of the printing platform 1, and the resin powder material 6 is laid on an intermediate position of the printing platform 1 by the laying mechanism 2 to form a layer of the resin powder material 6.
  • the laying mechanism 2 lays the other layer of the resin powder material 6 on the cured resin layer, and realizes the printing of the three-dimensional object by overlapping the layers.
  • the preheating mechanism is disposed in the printing platform 1, and the resin powder material 6 is heated by the printing platform 1 so that the resin powder material 6 is at a temperature close to and lower than the melting point.
  • the preheating mechanism may also be disposed in a molding cavity above the printing platform 1 to provide heat to the resin powder material 6 on the printing platform 1 so that the resin powder material 6 reaches a preheating temperature.
  • the resin powder material 6 can be processed by the first irradiation condition 31 provided by the first irradiation mechanism 3 to achieve a color from light to dark, and the darkened portion can be fused and bonded under the second irradiation condition 41 provided by the second irradiation mechanism 4 Thereby curing.
  • the resin powder material 6 is selected to include a light-colored or transparent resin such as nylon or PC or ABS, and a color-change additive is added to the resin powder material.
  • the color-change additive may be an organic color-change additive or an inorganic type At least one of discoloration additives.
  • Organic discoloration additives include at least one of spiropyran compounds or azobenzene compounds.
  • Inorganic discoloration additives include metal halides such as silver chloride or silver bromide or these compounds. Add a mixture of copper oxide or stannous oxide catalyst.
  • the first irradiation condition 31 matched with the resin powder material 6 may be blue light irradiation or ultraviolet light irradiation, and the first irradiation irradiation mechanism 3 is a light processing device that can be selectively irradiated, and may include a DLP device, an LCD device, or a blue light device. Sexual projection equipment. In other embodiments of the present invention, the resin powder material 6 may also be thermochromic.
  • the first irradiation condition 31 selectively provides heat to the resin powder material 6 to make at least part of the resin powder material 6 darker.
  • the resin powder material 6 forms a darkened portion 61 and a non-discolored portion 62 under the selective action of the first irradiation condition 31.
  • the darkened portion 61 is cured under the effect of the second irradiation condition 41, and the non-colored portion 62 is not cured under the effect of the second irradiation condition 41.
  • the second irradiation mechanism 4 is an infrared light curing device, and the second irradiation condition 41 is infrared irradiation.
  • the infrared can be selected from near-infrared, middle-infrared, or far-infrared according to the energy requirements.
  • the darkened portion 61 heats up fast, and the non-colored portion 62 heats up slowly or does not increase the temperature.
  • the darkened portion 61 is solidified without the discolored portion 62 not cured, so that a pattern is printed in the layer of the resin powder material 6.
  • the three-dimensional printing method in this embodiment may be performed by using the printing system of the foregoing three-dimensional printing system embodiment, and includes the following steps:
  • Step 1 The resin powder material 6 is uniformly laid on the printing platform 1 by the laying mechanism 2.
  • the laying mechanism 2 lays a layer of resin powder material 6 on a middle position of the printing platform 1.
  • the laying mechanism 2 can adjust the laying height.
  • Step 2 Preheat the resin powder material 6 to a temperature close to and lower than the melting point of the resin powder material 6 through a preheating mechanism. At this temperature, the resin powder material 6 further absorbs heat and can melt and stick to form a solid after increasing the temperature.
  • Step 3 The first irradiation condition 3 is selectively applied to at least a part of the resin powder material 6 by the first irradiation mechanism 3, as shown in FIGS. 2 (a) and (b) and FIG. 3, at least a part of the resin powder material 6
  • the color changes from light to dark to form a darkened portion 61, and the portion that does not receive the first irradiation condition 31 forms a non-discolored portion 62.
  • the darkened portion 61 is the area selected for curing, which is the same as the desired print shape and has higher accuracy.
  • 2 (a) and 2 (b) are merely schematic illustrations of the irradiation process.
  • the first irradiation mechanism 3 may be disposed above the side of the printing platform 1 and project toward the resin powder material 6 at a certain inclination angle.
  • the first irradiation mechanism 3 may be a DLP ultraviolet light source.
  • Step 4 As shown in FIG. 4, the second irradiation condition 41 is applied to the resin powder material 6 through the second irradiation mechanism 4, the darkened portion 61 is cured under the second irradiation condition 41, and the resin powder materials 6 are fused and adhered to each other to form a solid. ; The discolored portion 62 is not cured, and the resin powder material 6 still exists in a powdered state.
  • the second irradiation condition 41 may be such that infrared rays are uniformly irradiated on the entire area of the resin powder material 6. The second irradiation condition 41 does not need to be selective.
  • Step 5 As shown in FIG. 4, steps 1 to 4 are repeated, and the resin powder material 6 is cured layer by layer until a desired three-dimensional object is formed.
  • Step 6 Remove the uncured resin powder material 6 to obtain a three-dimensional object.
  • steps 1 to 5 the laying mechanism 2, the preheating mechanism, the first irradiation mechanism 3, and the second irradiation mechanism 4 are all controlled by the control device 5.
  • the invention provides a three-dimensional printing system and a three-dimensional printing method which can be applied to digital light curing.
  • the invention accurately utilizes the melting point and discoloration characteristics of the molding material, and realizes the rapid 3D printing of the molding material and the accuracy of the molding material through preheating, light treatment, and light curing.
  • the printing area and printing speed can be adjusted according to the irradiation conditions of light irradiation, which has higher efficiency and lower printing cost.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

La présente invention concerne un système d'impression tridimensionnelle, et une méthode d'impression associée. Le système d'impression tridimensionnelle comprend : une plate-forme d'impression pour placer un matériau en poudre de résine, le matériau en poudre de résine pouvant être approfondi en couleur dans une première condition d'irradiation, et le matériau en poudre de résine approfondi en couleur pouvant être durci dans une seconde condition d'irradiation, un mécanisme de pose pour déposer le matériau en poudre de résine uniformément sur la plate-forme d'impression ; un mécanisme de préchauffage pour préchauffer le matériau en poudre de résine à une température proche mais inférieure au point de fusion du matériau en poudre de résine ; un premier mécanisme d'irradiation pour appliquer la première condition d'irradiation à au moins une partie du matériau en poudre de résine ; et un second mécanisme d'irradiation pour appliquer la seconde condition d'irradiation au matériau en poudre de résine. La méthode d'impression tridimensionnelle comprend une impression couche par couche utilisant le système de moulage tridimensionnel. Le système d'impression tridimensionnelle de la présente invention et la méthode d'impression tridimensionnelle de celui-ci peuvent améliorer la précision d'impression et l'efficacité d'impression.
PCT/CN2019/079770 2018-06-26 2019-03-27 Système d'impression tridimensionnelle et méthode d'impression associée WO2020001100A1 (fr)

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CN201810671824.XA CN108908934A (zh) 2018-06-26 2018-06-26 三维打印系统及其打印方法

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Publication number Priority date Publication date Assignee Title
CN108908934A (zh) * 2018-06-26 2018-11-30 珠海天威飞马打印耗材有限公司 三维打印系统及其打印方法
WO2021208451A1 (fr) * 2020-04-14 2021-10-21 苏州聚复高分子材料有限公司 Matériau pour impression 3d et son procédé de préparation

Citations (5)

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WO2013092994A1 (fr) * 2011-12-23 2013-06-27 Compagnie Generale Des Etablissements Michelin Procede et appareil pour realiser des objets tridimensionnels
CN106564187A (zh) * 2016-11-10 2017-04-19 湖南华曙高科技有限责任公司 一种制造三维物体的方法和设备
CN106738904A (zh) * 2016-12-28 2017-05-31 厦门达天电子科技有限公司 一种光引发快速增材制造设备及方法
CN108724707A (zh) * 2018-06-26 2018-11-02 珠海天威飞马打印耗材有限公司 三维打印系统及其打印方法
CN108908934A (zh) * 2018-06-26 2018-11-30 珠海天威飞马打印耗材有限公司 三维打印系统及其打印方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013092994A1 (fr) * 2011-12-23 2013-06-27 Compagnie Generale Des Etablissements Michelin Procede et appareil pour realiser des objets tridimensionnels
CN106564187A (zh) * 2016-11-10 2017-04-19 湖南华曙高科技有限责任公司 一种制造三维物体的方法和设备
CN106738904A (zh) * 2016-12-28 2017-05-31 厦门达天电子科技有限公司 一种光引发快速增材制造设备及方法
CN108724707A (zh) * 2018-06-26 2018-11-02 珠海天威飞马打印耗材有限公司 三维打印系统及其打印方法
CN108908934A (zh) * 2018-06-26 2018-11-30 珠海天威飞马打印耗材有限公司 三维打印系统及其打印方法

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