Three-dimensional printing method and system

Abstract

The application provides a three-dimensional printing method and system. The method comprises: liquid removal of a light-cured three-dimensional printing model, so that the residual liquid thickness on the surface of the three-dimensional printing model is reduced to below a threshold value; and curing the three-dimensional printing model after liquid removal in a low-oxygen or oxygen-free environment, wherein the residual liquid on the surface of the three-dimensional printing model is cured. Using the three-dimensional printing method and system of the application, the post-processing process can be simplified, the post-processing speed can be improved, and waste liquid discharge can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to three-dimensional printing, and in particular to a three-dimensional printing method and system. BACKGROUND

[0002] Three-dimensional printing technology is a technology that takes a computer three-dimensional design model as a blueprint, uses a software to perform layering and discretization, and uses a numerical control forming system to perform layer-by-layer accumulation and bonding of metal powder, ceramic powder, plastic, cell tissue and other special materials by means of a laser beam, a hot melt nozzle and the like, and finally performs additive manufacturing to produce a solid product. Unlike traditional manufacturing which uses a mold, a turning and milling machine and the like to perform sizing and cutting of a raw material to finally produce a finished product, three-dimensional printing converts a three-dimensional entity into a plurality of two-dimensional planes, and produces the three-dimensional entity by processing the material and layer-by-layer accumulation, thereby greatly reducing the complexity of manufacturing. This digital manufacturing mode does not require complex processes, does not require a large machine tool, and does not require a large number of manpower, and can directly generate a part of any shape from computer graphics data, thereby extending production and manufacturing to a wider range of production personnel.

[0003] The photocuring method is a relatively mature three-dimensional printing technology, which uses the principle that a photocuring material (for example, a photosensitive resin) is cured after being irradiated by ultraviolet light to perform layer-by-layer printing and forming. After printing is completed, the model surface is inevitably contaminated with liquid resin, and needs to be cleaned. At the same time, because the photocuring resin cannot be completely cross-linked in a short time during the printing process, the model usually needs to be secondarily cured. Therefore, the post-processing, including spin-drying, cleaning, drying and UV (Ultra Violet) secondary photocuring, becomes a necessary step for photocuring three-dimensional printing. However, the existing post-processing system and method usually takes several hours for one processing, and the processing efficiency is low, which is unacceptable for high-speed three-dimensional printing. At the same time, the cleaning liquid also brings a large amount of waste liquid containing photocuring resin, which pollutes the environment. Therefore, it is an urgent technical problem to improve the processing speed of the post-processing of the photocuring three-dimensional printing technology and reduce the waste liquid discharge. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a three-dimensional printing method and system, which can simplify the post-processing process, improve the post-processing speed and reduce the waste liquid discharge.

[0005] To solve the above technical problem, the present application provides a three-dimensional printing method, which comprises the following steps: performing liquid removal on a photocuring formed three-dimensional printing model by dry method to reduce the thickness of residual liquid on the surface of the three-dimensional printing model to below a threshold value; and placing the three-dimensional printing model after liquid removal in a low-oxygen or oxygen-free environment for curing, wherein the residual liquid on the surface of the three-dimensional printing model is cured.

[0006] In one embodiment of the present application, the threshold value is less than half of the accuracy requirement of the three-dimensional printing model.

[0007] In one embodiment of the present application, the method further comprises using a light-curing material with a viscosity of less than 500 centipoise-seconds for the light-curing molding.

[0008] In one embodiment of the present application, the method for removing liquid from a three-dimensional printing model by dry method comprises: during the rotation of the three-dimensional printing model for spin-drying, blowing air flow to the surface of the three-dimensional printing model to assist in removing the residual liquid from the surface of the three-dimensional printing model facing away from the direction of centrifugal force.

[0009] In one embodiment of the present application, the method for removing liquid from a three-dimensional printing model by dry method comprises: after the rotation of the three-dimensional printing model for spin-drying, blowing air flow to the surface of the three-dimensional printing model to assist in removing the residual liquid from the surface of the three-dimensional printing model facing away from the direction of centrifugal force.

[0010] In one embodiment of the present application, the method for removing liquid from a three-dimensional printing model by dry method comprises: spin-drying the three-dimensional printing model in a first direction, and spin-drying the three-dimensional printing model in a second direction to remove the liquid from the surface of the three-dimensional printing model facing away from the direction of centrifugal force, the first direction being opposite to the second direction.

[0011] In one embodiment of the present application, the step of placing the three-dimensional printing model after liquid removal in a low-oxygen or oxygen-free environment for curing comprises: placing the three-dimensional printing model in a vacuum environment; or placing the three-dimensional printing model in a low-oxygen or oxygen-free protective gas atmosphere.

[0012] In one embodiment of the present application, when the three-dimensional printing model is placed in a low-oxygen or oxygen-free protective gas atmosphere, the method further comprises cooling the three-dimensional printing model by circulating and cooling the protective gas.

[0013] In one embodiment of the present application, the volume fraction of oxygen in the low-oxygen protective gas atmosphere is less than or equal to 7%.

[0014] In one embodiment of the present application, the liquid removal is performed while one or more three-dimensional printing models are attached to a supporting platform for the light-curing molding.

[0015] In one embodiment of the present application, before placing the three-dimensional printing model after liquid removal in a low-oxygen or oxygen-free environment for curing, the method further comprises detaching the one or more three-dimensional printing models from the supporting platform.

[0016] In an embodiment of the present application, the step of curing the liquid-removed three-dimensional printing model in a low-oxygen or oxygen-free environment comprises: irradiating the three-dimensional printing model with light in two opposite directions.

[0017] In an embodiment of the present application, the step of curing the liquid-removed three-dimensional printing model in a low-oxygen or oxygen-free environment comprises: irradiating a first side of the one or more three-dimensional printing models with light; and detaching the one or more three-dimensional printing models from the support platform; irradiating a second side of the one or more three-dimensional printing models opposite to the first side with light.

[0018] In an embodiment of the present application, the three-dimensional printing model comprises a tooth model.

[0019] The present application also provides a three-dimensional printing system, comprising: a liquid-removing device for liquid-removing a light-cured three-dimensional printing model in a dry manner, so as to reduce the residual liquid thickness on the surface of the three-dimensional printing model to below a threshold value; and a curing device for curing the liquid-removed three-dimensional printing model in a low-oxygen or oxygen-free environment, wherein the residual liquid on the surface of the three-dimensional printing model is cured.

[0020] In an embodiment of the present application, the threshold value is below half of the accuracy requirement of the three-dimensional printing model.

[0021] In an embodiment of the present application, the liquid-removing device comprises a containing space in which the three-dimensional printing model is placed, and a blow-drying assembly having an air outlet component extending into the containing space, for blowing air to the surface of the three-dimensional printing model during rotation of the three-dimensional printing model for spin-drying, so as to assist in removing the residual liquid on the surface of the three-dimensional printing model facing away from the direction of centrifugal force.

[0022] In an embodiment of the present application, the liquid-removing device comprises a spin-drying device for rotating the three-dimensional printing model for spin-drying, and a blow-drying device for blowing air to the surface of the spin-dried three-dimensional printing model, so as to assist in removing the residual liquid on the surface of the three-dimensional printing model facing away from the direction of centrifugal force.

[0023] In an embodiment of the present application, the spin-drying device comprises a rotatable frame and a tray arranged in the frame, the tray being used for placing the three-dimensional printing model, the frame being adapted to spin-dry the three-dimensional printing model in a state of being placed in a first direction, and spin-dry the three-dimensional printing model in a state of being placed in a second direction to remove the liquid on the surface of the three-dimensional printing model facing away from the direction of centrifugal force, the first direction being opposite to the second direction.

[0024] In an embodiment of the present application, the solidification device comprises a chamber and a vacuum pump or a supply system of low-oxygen or oxygen-free protective gas in communication with the chamber.

[0025] In an embodiment of the present application, the solidification device further comprises a circulating cooling device in communication with the chamber for circulating and cooling the protective gas.

[0026] In an embodiment of the present application, the liquid removal device is adapted to carry a carrying platform on which one or more three-dimensional printing models are attached.

[0027] In an embodiment of the present application, further comprising a detachment mechanism for detaching the one or more three-dimensional printing models from the carrying platform.

[0028] In an embodiment of the present application, the solidification device comprises two opposite light sources for irradiating the three-dimensional printing model from two directions.

[0029] In an embodiment of the present application, the solidification device comprises a first solidification sub-device for irradiating a first side of the one or more three-dimensional printing models using light, and a second solidification sub-device for irradiating a second side of the one or more three-dimensional printing models opposite to the first side using light; the system further comprises a detachment mechanism for detaching the one or more three-dimensional printing models processed by the first solidification sub-device from the carrying platform.

[0030] Compared with the prior art, the present application removes liquid from three-dimensional printing models in a low-residue dry method, so that the liquid thickness on the surface of the three-dimensional printing model is thin, and the three-dimensional printing model is secondarily solidified in a low-oxygen or oxygen-free environment. In the secondary solidification process, the liquid of the three-dimensional printing model is also solidified. When the residual liquid thickness is thin enough, the influence on the model precision is acceptable. The present application can omit the cleaning and drying steps, thereby improving the post-processing speed and reducing or even completely avoiding liquid pollutant emissions. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated and constitute a part of this application, illustrate embodiments of the present application, and together with the description serve to explain the principles of the present application. In the drawings:

[0032] Figure 1 is a schematic diagram of the post-processing part of a three-dimensional processing system according to an embodiment of the present application.

[0033] Figure 2A 、 2B is a schematic diagram of the internal structure of a spin-drying device according to an embodiment of the present application;

[0034] Figure 3A 、3B is a schematic diagram of the internal structure of a liquid removal device according to another embodiment of the present application;

[0035] Figure 3C is a schematic diagram of the internal structure of a blow-drying device according to an embodiment of the present application;

[0036] Figure 4 is a schematic diagram of the internal structure of a solidification device according to an embodiment of the present application;

[0037] Figure 5 is a schematic diagram of a detachment mechanism according to an embodiment of the present application;

[0038] Figure 6 is a flow chart of a three-dimensional printing method according to an embodiment of the present application;

[0039] Figure 7 is a flow chart of a three-dimensional printing method according to another embodiment of the present application;

[0040] Figure 8 is a flow chart of a three-dimensional printing method according to another embodiment of the present application; and

[0041] Figure 9 is a flow chart of a three-dimensional printing method according to another embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some examples or embodiments of the present application, and for those skilled in the art, the present application can be applied to other similar scenarios without creative labor on the basis of these drawings. Unless the context clearly indicates otherwise or otherwise stated, the same reference numbers in the drawings represent the same structures or operations.

[0043] As shown in the present application and claims, unless the context clearly indicates otherwise or otherwise stated, the words "one", "a", "an", and / or "the" do not specifically refer to the singular, but also include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements.

[0044] The foregoing is a summary and thus contains only the most basic embodiment. The application can be practiced with modification and alteration and still be within the scope of the application. This summary is not intended to mean that the application described herein will necessarily cover all of the subject matter shown in the claims. The claims will cover both the specific and the general embodiments disclosed. The application described herein will cover all such modifications and alterations from the embodiments described in the application provided they come within the scope of the claims. The above specification, examples and data provide exemplary description and standard

[0045] In the description of the application, it should be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0046] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used herein is interpreted accordingly.

[0047] Furthermore, it should be noted that the use of "first", "second", etc. words to define parts is merely for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application. In addition, although the terms used in the present application are selected from commonly known terms, some terms mentioned in the specification of the present application can be selected by the applicant according to his or her judgment, and the detailed meaning thereof is described in the relevant part of the description. In addition, the present application is required to be understood not only by the actual terms used, but also by the meaning implied by each term.

[0048] It should be understood that when a component is referred to as "on", "connected to", "coupled to" or "contacting" another component, it can be directly on, connected to, coupled to, or contacting the other component, or intervening components can be present. In contrast, when a component is referred to as "directly on", "directly connected to", "directly coupled to", or "directly contacting" another component, there are no intervening components present. Similarly, when a first component is referred to as being "electrically in contact with" or "electrically coupled to" a second component, there is an electrical path between the first component and the second component that allows current to flow. The electrical path can include capacitors, coupled inductors, and / or other components that allow current to flow, even if there is no direct contact between conductive components.

[0049] Embodiments of the present application describe a three-dimensional printing system and method that can simplify the post-processing process and improve the post-processing speed. In particular, this system and method can omit the cleaning and drying steps, greatly reducing liquid and gas pollutant emissions.

[0050] Figure 1 is a schematic diagram of a post-processing part of a three-dimensional printing system according to an embodiment of the present application. Referring to Figure 1 The three-dimensional printing system 100 according to an embodiment of the present application includes a liquid removal device 110 and a solidification device 120, as shown. The liquid removal device 110 is used to remove the liquid from the light-cured three-dimensional printing model in a low-liquid-residue manner, so that the residual liquid thickness on the surface of the three-dimensional printing model is reduced to below a threshold value. The solidification device 120 solidifies the three-dimensional printing model after spin-drying in a low-oxygen or oxygen-free environment. In Figure 1 In the example, the liquid removal device 110 and the solidification device 120 are two separate devices. In other examples, the liquid removal device 110 and the solidification device 120 can also be an integrated device.

[0051] A three-dimensional printed model, especially one formed by a light-curing method, is removed from a printing liquid (typically a light-curing resin) after printing. At this time, there is residual liquid on the surface of the three-dimensional printed model. The liquid removal device 110 is a dry method that typically includes a spin dryer having a body rotating around a rotating shaft, which separates the liquid on the surface of the three-dimensional printed model by centrifugal force generated by rotation. According to embodiments of the present application, after spinning, the three-dimensional printed model no longer undergoes a cleaning step of cleaning the liquid on the surface of the three-dimensional printed model, so the spin dryer 110 performs spinning in a low-liquid-residue manner. In contrast, a conventional liquid removal method uses spinning and wet cleaning, so it does not require the amount of liquid residue after spinning. In one example, "low-liquid residue" reduces the thickness of the liquid on the surface of the three-dimensional printed model to less than half of the accuracy requirement. For example, assuming that the accuracy requirement is 0.1 mm, the threshold value of the thickness of the liquid is 0.05 mm.

[0052] Reference Figure 2A , 2B As shown in FIG. 1, the liquid removal device 110 includes a spin dryer, which mainly includes a frame 111, a rotating shaft 112, a tray 113, a pressing plate 114, a pressing mechanism 115, and a motor 116. The frame 111 has two side plates 111a and 111b opposite in the axial direction, and four side plates (two of which, 111c and 111d, are shown in the figure) opposite in the circumferential direction. These side plates form a receiving space. The rotating shaft 112 is installed between the two side plates 111a and 111b and is drivingly connected to the motor 116 by a belt 117 (or a chain not shown in the figure). When the motor 116 rotates, it drives the rotating shaft 112 and the frame 111 to rotate together. Two trays 113 can be placed on the two side plates 111c and 111d, respectively, to rotate with the frame 111.

[0053] In embodiments of the present application, the number of trays 113 placed in the frame 111 can be two, as shown in FIGS. 1 and 2, or one or more. Figure 2A and 2B The tray 113 is used to place one or more three-dimensional printed models. After the tray 113 is placed in the side plate, the pressing plate 114 can be pressed against the tray 113 and the three-dimensional printed models thereon by the pressing mechanism 115 to prevent the models from falling, moving, and the like during spinning, which can cause damage due to mutual collision and friction between the models.

[0054] The pressing mechanism 115 includes a bracket 115a, multiple pins 115b, and multiple springs 115c. The pins 115b are vertically mounted on the bracket 115a and are approximately parallel to each other. A pressure plate 114 is mounted on the pins 115b and can move up and down along the pins. The springs 115c are mounted on the pins 115b and press against the pressure plate 114. Under the pressure of the springs 115c, the pressure plate 114 remains pressed down. When it is necessary to remove the tray 113, the pressure plate 114 is lifted against the elastic force of the springs 115c, and the tray 113 is removed.

[0055] Specifically, as in this application Figure 2A and 2B In the illustrated embodiment, the bracket 115a further includes a bracket base 115d, a displacement plate 115e, and a pull plate 115f. The bracket base 115d is fixedly mounted on the frame 111 and cannot be moved. The displacement plate 115e and the pull plate 115f are movably mounted on the bracket base 115d. When the pull plate 115f is pulled to move along a first axis X parallel to the bracket base 115d, the pull plate 115f drives the displacement plate 115e to move along the first axis X.

[0056] Specifically, such as Figure 2A As shown, the displacement plate 115e includes at least one inclined side 115e', and the pin 115b includes a displacement end 115g protruding beyond the pin 115b. The displacement end 115g contacts the inclined side 115e', and when the pull plate 115f drives the displacement plate 115e to move along the first axis X, the displacement end 115g descends and rises along the inclined side 115e' and drives the pin 115b to move, thereby driving the pressure plate 114 to move closer to and away from the tray 113.

[0057] For example, in such Figure 2A and 2B In the embodiment shown, the bracket base 115d is fixed on the frame 111. When the pull plate 115f drives the displacement plate 115e to move along the first axis X, the displacement end 115g rises along the inclined side 115e' and drives the pin 115b to move, thereby driving the pressure plate 114 to approach the tray 113, so as to press and fix the 3D printed model on the tray 113 onto the tray 113.

[0058] Furthermore, the pressing mechanism 115 also includes at least two limiting blocks 115h disposed on the support base 115d, located at both ends of one side of the displacement plate 115e, to limit the displacement plate 115e from shifting when it moves along the first axis X.

[0059] It is understood that the above describes one way in which the pressing mechanism 115 drives the pressure plate 114 to move closer to and away from the tray 113, but the present invention is not limited thereto.

[0060] In one embodiment, the three-dimensional printing model is placed in the tray 113 in a first orientation (e.g., the front face is facing the rotation shaft 112), and the centrifugal drying is performed. Then, the three-dimensional printing model is placed in the tray 113 in a second orientation (e.g., the back face is facing the rotation shaft 112), and the centrifugal drying is performed again. By performing the centrifugal drying in two orientations, the liquid on the surface of the three-dimensional printing model can be removed well, so that the liquid residue on the surface of the three-dimensional printing model is low. For a three-dimensional printing model with a concave part, such as a tooth model, after the centrifugal drying is performed with the back face of the tooth facing the radial outside, the centrifugal drying is performed with the concave part of the tooth cavity facing the radial outside, so that the liquid residue on the concave part of the tooth cavity is reduced significantly. Therefore, the embodiment of the present application is particularly suitable for the centrifugal drying of the tooth model.

[0061] The bottom surface of the tray 113 can be woven with steel wires to form a large hollow, so that the liquid can be easily thrown out. A plurality of holes can also be formed in each side plate of the frame 111, so that the liquid can be easily thrown out, and the weight of the body is reduced.

[0062] In one embodiment, one or more three-dimensional printing models can be attached to a supporting platform (e.g., the models are generally attached to the supporting platform after printing). The attachment force can prevent the three-dimensional printing models from being separated from the supporting platform during the rotation of the centrifugal drying. Then, the supporting platform is placed in the tray in a first orientation (e.g., the front face is facing the rotation shaft 112), and the centrifugal drying is performed. Then, the supporting platform is placed in the tray in a second orientation (e.g., the back face is facing the rotation shaft 112), and the centrifugal drying is performed again. By performing the centrifugal drying in two orientations, the liquid on the surface of the three-dimensional printing model can be removed well, so that the liquid residue on the surface of the three-dimensional printing model is low. In this embodiment, the pressing plate 114 and the pressing mechanism 115 can be omitted. In one embodiment of the present application, the supporting platform can be flipped after the first centrifugal drying, and the centrifugal drying is performed on the other side of the printing workpiece, so that the liquid on the surface of the three-dimensional printing model can be removed well.

[0063] In one embodiment, a blowing assembly can be introduced into the frame of the centrifugal drying device, and the blowing assembly is connected to a gas (e.g., air) source, so that the gas is blown to the surface of the three-dimensional printing model during the rotation of the three-dimensional printing model for the centrifugal drying, so as to assist in removing the liquid on the surface facing away from the centrifugal direction, and to blow the model and accelerate the centrifugal drying process. By using this method, the three-dimensional printing model does not need to be placed in a second orientation for the centrifugal drying, so that the centrifugal drying efficiency is improved.

[0064] Figure 3A and 3B is a schematic view of the internal structure of a liquid removal device according to another embodiment of the present application. Referring to Figure 3A and 3BAs shown, the liquid removing device 210 mainly comprises a frame 210a, a rotating part 211, a rotating shaft 212, a fixing part 213, a blow-drying assembly 214 and a motor 215. The frame 210a comprises a top plate 2101, a bottom plate 2102 and a side plate 2103. The top plate 2101 and the bottom plate 2102 are oppositely arranged. The side plate 2103 can be annular and connected to the top plate 2101 and the bottom plate 2102, thereby forming a cylindrical structure together. The motor 215 is arranged on the frame 210a. The top plate 2101 is provided with a through hole through which the rotating shaft 212 can pass.

[0065] The rotating part 211 comprises a top plate 2111, a bottom plate 2112 and a side plate 2113. The top plate 2111 and the bottom plate 2112 are oppositely arranged. The side plate 2113 can be annular and connected to the top plate 2111 and the bottom plate 2112. The top plate 2111, the bottom plate 2112 and the side plate 2113 can form a containing space a. As shown, Figure 3B As shown, the middle part of the top plate 2111 and the bottom plate 2112 oppositely arranged are respectively provided with through holes 2111a and 2112a through which the rotating shaft 212 can pass. The rotating shaft 212 passes through the center of the containing space a and is perpendicular to the top plate 2111 and the bottom plate 2112. One end of the rotating shaft 212 passing through the top plate 2111 is connected to the motor 215. In order to make the rotating part 211 be driven to rotate by the rotating shaft 212, the part of the rotating shaft 212 passing through the bottom plate 2112 is connected to the bottom plate 2112 through a connecting piece 2114.

[0066] One or more three-dimensional printing models can be attached to a carrying platform (for example, the models are generally attached to the carrying platform after printing). This adhesion can make the three-dimensional printing models not separate from the carrying platform during the spinning process. The rotating part 211 can be provided with a plurality of carrying platform containing seats for placing the carrying platform 216 of the three-dimensional printing model. Exemplarily, the carrying platform can be fixed on a side in the containing space a.

[0067] The fixed part 213 can include a first fixing member 2131, and the first bearing 212a and the second bearing 212b of the rotating shaft 212 are arranged on the first fixing member 2131. A through hole is arranged between the first bearing 212a and the second bearing 212b, and a sleeve 2132 is arranged in the through hole. The sleeve 2132 can also be mounted on the first fixing member 2131. One end of the rotating shaft 212 is arranged on the first fixing member 2131 through the first bearing 212a, the inner ring of the first bearing 212a is a rotor, and the inner ring of the first bearing 212a rotates with the rotating shaft 212; the outer ring of the first bearing 212a is a stator, and the outer ring of the first bearing 212a is arranged on the first fixing member 2131 and does not rotate. The top plate 2111 is arranged on the first fixing member 2131 through the second bearing 212b. The outer ring of the second bearing 212b is a rotor, and the outer ring of the second bearing 212b rotates with the top plate 2111; the inner ring of the second bearing 212b is a stator, and the inner ring of the second bearing 212b is arranged on the first fixing member 2131 and does not rotate.

[0068] As shown in Figure 3B The fixed part 213 further includes a second fixing member 2133, which is located outside the bottom plate 2112 and arranged at the bottom of the rotating part 211, and the other end of the rotating shaft 212 is arranged on the second fixing member 2133 through a third bearing 212c. The inner ring of the third bearing 212c is a rotor, and the inner ring of the third bearing 212c rotates with the rotating shaft 212; the outer ring of the third bearing 212c is a stator, and the outer ring of the third bearing 212c is arranged on the second fixing member 2133 and does not rotate.

[0069] Through the arrangement of the first bearing 212a, the second bearing 212b and the third bearing 212c, the fixed part 213 does not rotate with the rotating shaft 212.

[0070] The top plate 2111 and the bottom plate 2112 can each have a plurality of through holes to facilitate the discharge of liquid attached to the three-dimensional printing model.

[0071] The drying assembly 214 includes a fan 2141, a main pipe 2142, branch pipes 2143 and air outlet components 2144. The main pipe 2142 is connected to the fan 2141 arranged on the frame 210a, and passes through the sleeve 2132 in the first fixing member 2131 between the first bearing 212a and the second bearing 212b, and enters the accommodation space a. The main pipe 2142 is connected to the two branch pipes 2143 through a tee pipe 2145. The branch pipes 2143 are respectively connected to two through holes 2144a at a distance apart on the air outlet components 2144. The air outlet components 2144 are provided with a plurality of air outlets on the side facing the side plate 2113, for uniformly blowing air onto the three-dimensional printing model, to dry the model in the backward centrifugal direction and accelerate the model drying process. The included angle between the air flow and the model is preferably 45 degrees. If the drying assembly 214 is installed in a rotating structure without a fixed part, the rotation of the drying assembly 214 with the rotating shaft will cause the model to fall off and the blowing effect to be poor.

[0072] In another embodiment of the present application, the spinning and drying can be performed in different stages. For example, in the embodiment shown in Figure 2A , the three-dimensional printing model is placed in the tray 113 in a state of being placed in a first direction (e.g., the front face facing the rotating shaft 112) to perform spinning, and then is placed in the drying device to perform drying, to assist in removing the residual liquid on the surface of the three-dimensional printing model facing away from the centrifugal force direction. Alternatively, in the embodiment shown in Figure 3A , the drying assembly is omitted, the three-dimensional printing model is placed in the bearing platform 216 to perform spinning, and then is placed in the drying device to perform drying. For a three-dimensional printing model having a recess on the front face, such as a tooth model, after the back of the tooth is subjected to centrifugal spinning to the radially outer side, the front face is subjected to drying, which can reduce the thickness of the liquid on the front face.

[0073] In Figure 3C , a cross-sectional view of the internal structure of the drying device according to an embodiment of the present application is shown. As shown in Figure 3C , the drying device 300 includes a frame 301, motors 302, slide rails 303, lead screws 304, air pipes 305 and air outlet pipes 306. The frame 301 is divided into a plurality of spaces S, and each space S can accommodate a bearing table 30 with a three-dimensional printing model. Each space S corresponds to a drive mechanism composed of a motor 302 and a lead screw 304, for driving the bearing table 30 to move up and down along the slide rail 303. The lead screw 304 is connected to the output shaft of the motor 302. Each space S is arranged with an air pipe 305 and an air outlet pipe 306 in communication with the air pipe 305. The air pipe 305 is connected to a gas source and transports gas to the air outlet pipe 306. The air outlet pipe 306 has an air outlet 306a facing the bearing table 30. When the bearing table 30 moves up and down, the air outlet 306a can blow to each area of the bearing table 30, to remove the residual liquid on the three-dimensional printing model.

[0074] In an embodiment of the present application, the photocurable material used in three-dimensional printing can be of low viscosity, for example, less than 500 centipoise·second. Liquid of low viscosity is easier to be wiped off or blown away, thus reducing the residue on the model and ensuring the printing accuracy.

[0075] Figure 4 is a schematic diagram of the internal structure of a curing device according to an embodiment of the present application. Referring to Figure 4 the curing device 120 of the present embodiment includes a cavity 121, a light source 122, a tray 123, a protective gas supply system 124, and a circulating cooling device 125.

[0076] In the present embodiment, the curing device 120 includes two light sources 122 opposite to each other, for irradiating the tray 123 from two directions, thus performing secondary curing on the three-dimensional printing model carried on the tray 123. In such a case, the tray 123 is woven with steel wires, forming a large hollow, so that the two light sources 122 above and below can simultaneously irradiate the three-dimensional printing model on the tray 123.

[0077] The light source 122 is, for example, a specific wavelength of violet or ultraviolet light source. The tray 123 can carry one or more three-dimensional printing models. The light source 122 is preferably equipped with a heat dissipation system 122a to help the light source 122 dissipate heat, which can be achieved by means of circulating cold water.

[0078] In the present embodiment, the light source 122 is also connected to an external power supply 122b to supply power to the light source 122 to ensure continuous irradiation of the three-dimensional printing model in the cavity 121 for curing.

[0079] When the three-dimensional printing model surface is left with liquid printing material, since the three-dimensional printing material (for example, acrylate resin) is usually anaerobic, the surface of several microns cannot be smoothly cured in an oxygen environment. Therefore, in the present application, the gas supply system 124 is used to introduce low-oxygen or oxygen-free protective gas into the cavity 121 to protect the liquid on the surface of the three-dimensional printing model from being cured in an oxygen-free or low-oxygen environment. In an embodiment of the present application, the gas supply system 124 includes a plurality of gas supply pipelines, which are not limited in the present application.

[0080] Here, the volume fraction of oxygen in the low-oxygen protective gas is less than or equal to 7%. The main component of the protective gas can be common gases such as carbon dioxide and nitrogen. The gas supply system 124 is used to introduce the protective gas provided by the gas source (not shown) into the cavity 121, and can also include an air extraction component to further reduce the oxygen content before the protective gas is introduced.

[0081] Since the cavity 121 needs to be sealed to prevent the protective gas from being released, the heat from the light source 122 itself, the heat converted from the energy of the light source irradiating on the model, and the heat released when the model is being solidified, will accumulate in the cavity 121. Therefore, the circulating cooling device 125 can include a plurality of condensers 125a and circulating fans 125b. The condensers 125a exchange heat with the protective gas flowing in, which has been heated, through the internal circulation of the coolant and the external circulation, thereby taking away the heat and cooling the protective gas. The circulating fans 125b circulate the protective gas in the cavity 121. In this way, the heat is taken away from the cavity 121 to prevent the surface temperature of the printed model from being too high. The coolant can be water or other suitable cooling medium.

[0082] In this embodiment, the circulating cooling device 125 further includes another set of condensers 125a' and circulating fans 125b' arranged opposite to the condensers 125a and circulating fans 125b, so that the circulating cooling of the gas in the cavity 121 can be performed simultaneously at the left and right sides and at the upper left and lower right positions, thereby shortening the cooling time of the gas in the cavity 121 and optimizing the cooling effect.

[0083] The cavity 121 can be designed to be sealed, and before the protective gas is introduced, the air in the cavity can be pumped out by the air pumping device, and then the protective gas is introduced.

[0084] The cavity 121 can also be designed to have an exhaust hole at the upper portion thereof. When the protective gas is introduced, the air in the cavity 121 is discharged through the exhaust hole. The exhaust hole can be always open, or can be selectively opened or closed.

[0085] Further optimization, a valve is further arranged on the exhaust hole, which is suitable for closing the exhaust hole after the protective gas is introduced into the cavity 121 by the gas supply system 124 for a period of time, so as to prevent the release of the protective gas, thereby maintaining the low-oxygen or oxygen-free environment in the cavity 121.

[0086] In another embodiment, the protective gas supply system 124 can be replaced by a vacuum pump to provide an oxygen-free or low-oxygen vacuum environment in the cavity 121.

[0087] In another embodiment, the solidification device 120 can be divided into a first solidification sub-device and a second solidification sub-device. The first solidification sub-device is provided with a light source on one side (for example, the upper side in the middle) for irradiating the first side of the three-dimensional printed model with light. The second solidification sub-device is provided with a light source on the other side (for example, the lower side in the middle) for irradiating the second side of the three-dimensional printed model opposite to the first side with light. Figure 4 Figure 4

[0088] ​​When the three-dimensional printing model is attached to a carrier platform for spin-drying, a detachment mechanism can be used to detach the three-dimensional printing model from the carrier platform. Figure 5 is a schematic diagram of a detachment mechanism according to an embodiment of the present application. Referring to Figure 5 the detachment mechanism 130 includes a base 131, a top plate 132, a vertical driving mechanism 133, and a motor 134. The carrier platform 135 for detachment can be carried on the base 131. The vertical driving mechanism 133 is arranged on one side of the base 131 and is powered by the motor 134. The top plate 132 is arranged on the vertical driving mechanism 133 and is vertically moved up and down under the driving of the vertical driving mechanism 133. The bottom surface of the top plate 132 is provided with a plurality of pins 132a. When the top plate 132 moves downward, the plurality of pins 132a are inserted into the corresponding through holes in the carrier platform 135 to separate the three-dimensional printing model from the other side (the lower surface in the figure) of the carrier platform 135. After separation, the three-dimensional printing model can be sent to the curing device for double-sided curing.

[0089] In another embodiment, when the curing device 120 is divided into a first curing sub-device and a second curing sub-device, the three-dimensional printing model can be attached to the carrier platform, first cured in the first curing sub-device, and then detached in the detachment mechanism 130. The detached three-dimensional printing model is then placed in the second curing sub-device for curing of the other side.

[0090] Although the system shown includes a plurality of separate devices, it can be understood that these devices can be implemented as an automated pipeline, and the three-dimensional printing model or the carrier platform containing the three-dimensional printing model can be transported between the devices by a mechanical hand, a conveyor belt, or the like.

[0091] In an embodiment of the present application, when the spin-drying centrifugal force of the spin-drying device is large enough and the viscosity of the liquid photocurable material is low enough, the liquid photocurable material remaining on the surface of the three-dimensional printing model can be sufficiently small. These materials will be cured on the surface of the three-dimensional printing model in the subsequent curing operation. When the remaining amount is sufficiently small, the influence of these residues on the printing accuracy can be ignored. Therefore, only spin-drying and curing are required to complete the post-processing of the three-dimensional printing model.

[0092] Figure 6 is a flowchart of a three-dimensional method according to an embodiment of the present application. Referring to Figure 6 the three-dimensional printing method of the present embodiment includes the following steps:

[0093] In step 601, a three-dimensional printing model is formed by photocuring.

[0094] This step can use light to irradiate liquid photocurable material, such as photosensitive resin, to form a three-dimensional printing model by layer-by-layer curing on a carrier platform.

[0095] The solidified three-dimensional printing model is taken out of the liquid photocuring material, at this time, there is liquid material remaining in the photocuring material. In this case, the photocuring material can be selected as a material with low viscosity, such as a photocuring material with viscosity below 500 centipoise·second.

[0096] In step 602, the photocured three-dimensional printing model is subjected to liquid removal by dry method, so that the thickness of the residual liquid on the surface of the three-dimensional printing model is reduced to below the threshold value.

[0097] This step can be performed using the spin-drying device shown in Figure 2A , 2B or its variants. That is, spin-drying is performed in a state where the three-dimensional printing model is placed in a first direction, and then spin-drying is performed in a state where the three-dimensional printing model is placed in a second direction, the first direction being opposite to the second direction. Alternatively, this step can be performed using the liquid removal device shown in Figure 3A , 3B or its variants. That is, during the process of rotating the three-dimensional printing model for spin-drying, air flow is blown to the surface of the three-dimensional printing model to assist in removing the liquid. Alternatively, after spin-drying in a state where the three-dimensional printing model is placed in a first direction, the non-spin-dried side is subjected to air flow blowing using the blow-drying device shown in Figure 2A , 3A The angle of the air flow is preferably 45 degrees to the model. Alternatively, this step can be performed using other dry liquid removal methods or devices that can achieve low liquid residue. Figure 3C

[0098] In step 603, the three-dimensional printing model after liquid removal is placed in a low-oxygen or oxygen-free environment for curing.

[0099] In this step, the two sides of the three-dimensional printing model are subjected to light irradiation, so that the liquid on the surface of the three-dimensional printing model is cured, and at the same time, the entire three-dimensional printing model is subjected to secondary curing to improve the strength.

[0100] This step can be performed using the curing device shown in Figure 4 or its variants. In variants, for example, the curing device can be divided into a first curing sub-device and a second curing sub-device.

[0101] Figure 7 is a flow chart of a three-dimensional printing method according to another embodiment of the present application. Referring to Figure 7 , a three-dimensional printing method according to the present embodiment includes the following steps:

[0102] In step 701, a three-dimensional printing model is formed by photocuring.

[0103] This step is similar to step 601, and will not be described here.​

[0104] In step 702, the completed three-dimensional printed model is separated from the support platform.

[0105] This step can be performed using the detachment mechanism shown in Figure 5 or a variant thereof.

[0106] In step 703, the liquid on the surface of the three-dimensional printed model is removed by dry method to reduce the residual liquid thickness to below a threshold value.

[0107] This step is similar to step 602 and will not be described here.

[0108] In step 704, the three-dimensional printed model after liquid removal is placed in a low-oxygen or oxygen-free environment for curing.

[0109] This step is similar to step 603 and will not be described here.

[0110] Figure 8 is a flowchart of a three-dimensional printing method according to another embodiment of the present application. Referring to Figure 8 , a three-dimensional printing method according to the present embodiment includes the following steps:

[0111] In step 801, a three-dimensional printed model is formed by photocuring.

[0112] This step is similar to step 601 and will not be described here.

[0113] In step 802, the liquid on the surface of the three-dimensional printed model is removed by dry method to reduce the residual liquid thickness to below a threshold value.

[0114] This step can be performed using the liquid removal device shown in Figure 3A , 3B or a variant thereof. That is, during the spinning of the three-dimensional printed model to remove the liquid, air flow is blown onto the surface of the three-dimensional printed model to assist in the removal of the liquid. Alternatively, this step can be performed using other spinning methods or devices that can achieve low liquid residue.

[0115] In step 803, the completed three-dimensional printed model is separated from the support platform.

[0116] This step is similar to step 702 and will not be described here.

[0117] In step 804, the three-dimensional printed model after separation is placed in a low-oxygen or oxygen-free environment for curing.

[0118] This step is similar to step 704 and will not be described here.

[0119] Figure 9 is a flow chart of a three-dimensional printing method according to another embodiment of the present application. Referring to FIG. 9, a three-dimensional printing method according to an embodiment of the present application includes the following steps: Figure 9

[0120] In step 901, a three-dimensional printing model is formed by light solidification.

[0121] This step is similar to step 601, and thus is not described here.

[0122] In step 902, the three-dimensional printing model formed by light solidification is subjected to liquid removal by dry method, so that the residual liquid thickness on the surface of the three-dimensional printing model is reduced to below a threshold value.

[0123] This step is similar to step 802, and thus is not described here.

[0124] In step 903, the first side of the three-dimensional printing model is irradiated with light, and subjected to light solidification.

[0125] This step is performed using the first solidification sub-device described above or a variation thereof.

[0126] In step 904, the three-dimensional printing model is separated from the support platform.

[0127] This step is similar to step 702, and thus is not described here.

[0128] In step 905, the second side of the three-dimensional printing model opposite to the first side is irradiated with light, and subjected to light solidification.

[0129] This step is performed using the second solidification sub-device described above or a variation thereof.

[0130] Flow charts are used in the present application to illustrate operations performed by systems according to embodiments of the present application. It should be understood that the foregoing or following operations are not necessarily performed in the order as described. Rather, various steps can be processed in reverse order, or at the same time. Meanwhile, other operations can be added to these processes, or one or more steps can be removed from these processes.

[0131] The foregoing merely illustrates the principles of the application. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described or shown herein, embody the principles of the application and are thus within its spirit and scope. It will be understood that the application is not limited to the embodiments described above, but includes all embodiments that are within the spirit and scope of the application, including embodiments that employ, to the extent technically possible, equivalents and / or substitutions of elements for other elements, and embodiments that combine one or more features of the above-described embodiments or variations thereof.

[0132] ​Also, the use of "a" or "an" to describe an element of the application is merely taken to mean "one or more" in some embodiments, unless otherwise indicated. The singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", or "includes" and / or "including" when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and / or groups thereof.

[0133] Similarly, it is to be noticed that the term coupled, when used in the present specification, is not limited to the case where a connection between the entities is directly made, but it is also intended to cover the case where the connection is made through another entity.

[0134] Some embodiments use numerical designations to describe components, quantities of attributes. It is to be understood that such numerical designations used in the description of embodiments are, in some examples, modified by the adjectives "about", "approximately", or "generally". Unless otherwise stated, "about", "approximately", or "generally" indicates that the stated numerical value allows for a ±20% variation. Accordingly, numerical values used in the specification and claims are approximations which can vary depending upon the desired properties sought to be obtained by the individual embodiment. In some embodiments, numerical values are presented in a specified format, and should be considered to be rounded to the nearest significant figure. Although the numerical ranges and parameters setting forth the broad scope of the application in some embodiments are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, can contain certain errors associated with testing measurements.

[0135] While the application has been described with reference to the currently preferred embodiments, those skilled in the art will recognize that changes can be made within the spirit of the application, and it is intended to include all changes coming within the scope of the appended claims.

Claims

1. A 3D printing method, comprising the following steps: The liquid removal device removes liquid from the photopolymerized 3D printed model using a dry method, reducing the residual liquid thickness on the surface of the 3D printed model to below a threshold. The liquid removal device includes a rotatable frame, a tray disposed within the frame, a pressure plate, and a pressing mechanism. The tray is used to place the 3D printed model. The frame has two axially opposite side plates and four circumferentially opposite side plates, all of which form a receiving space. as well as The 3D printed model, after liquid removal, is placed in a low-oxygen or oxygen-free environment for curing using a curing device, where the residual liquid on the surface of the 3D printed model is cured. The pressing mechanism includes a displacement plate, a pull plate, and a support base fixedly connected to the frame. The displacement plate, the pull plate, and the pressure plate are configured such that when the pull plate moves along a first axis X parallel to the support base, it drives the displacement plate to move along the first axis X, thereby driving the pressure plate to move closer to and away from the tray.

2. The method as described in claim 1, characterized in that, The threshold is less than half of the accuracy requirement of the 3D printed model.

3. The method as described in claim 1, characterized in that, It also includes using photocurable materials with a viscosity of less than 500 centipoise seconds for photocuring molding.

4. The method as described in claim 1 or 2, characterized in that, A method for removing liquid from a photopolymer-cured 3D printed model using a dry method includes: during the process of rotating the 3D printed model to spin dry, blowing an airflow onto the surface of the 3D printed model to assist in removing residual liquid from the surface of the 3D printed model opposite to the direction of centrifugal force.

5. The method as described in claim 1 or 2, characterized in that, A method for removing liquid from a photopolymer-cured 3D printed model using a dry method includes: rotating the 3D printed model to spin dry, and then blowing an airflow onto the surface of the 3D printed model to assist in removing residual liquid from the surface of the 3D printed model opposite to the direction of centrifugal force.

6. The method as described in claim 1 or 2, characterized in that, The method for removing liquid from a printed 3D model using a dry method includes: spin-drying the 3D model while it is placed in a first direction, and spin-drying the 3D model while it is placed in a second direction to remove liquid from the surface of the 3D model facing away from the direction of centrifugal force, wherein the first direction and the second direction are opposite.

7. The method as described in claim 1, characterized in that, The steps involved in curing the 3D printed model after liquid removal in a low-oxygen or oxygen-free environment include: Place the 3D printed model in a vacuum environment; or The 3D printed model is placed in a low-oxygen or oxygen-free protective gas atmosphere.

8. The method as described in claim 7, characterized in that, When the 3D printed model is placed in a low-oxygen or oxygen-free protective gas atmosphere, the method further includes cooling the 3D printed model by circulating and cooling the protective gas.

9. The method as described in claim 7, characterized in that, This includes ensuring that the volume fraction of oxygen in the low-oxygen protective gas atmosphere is less than or equal to 7%.

10. The method as described in claim 1, characterized in that, The liquid removal is performed when one or more 3D printed models are attached to a support platform for the photopolymerization process.

11. The method as described in claim 10, characterized in that, Before placing the liquid-removed 3D printed model in a low-oxygen or oxygen-free environment for curing, the process also includes: detaching the one or more 3D printed models from the support platform.

12. The method as described in claim 10, characterized in that, The step of curing the 3D printed model after removing the liquid by placing it in a low-oxygen or oxygen-free environment includes irradiating the 3D printed model with light from two opposing directions.

13. The method as described in claim 10, characterized in that, The steps involved in curing the 3D printed model after liquid removal in a low-oxygen or oxygen-free environment include: Illuminate the first side of the one or more 3D printed models with light; and Detach the one or more 3D printed models from the carrier platform; The second side of the one or more 3D printed models, opposite the first side, is illuminated with light.

14. The method as described in claim 1, characterized in that, The 3D printed model includes a tooth model.

15. A three-dimensional printing system, comprising: A liquid removal device is used to remove liquid from a photopolymerized 3D printed model using a dry method, reducing the residual liquid thickness on the surface of the 3D printed model to below a threshold. The liquid removal device includes a rotatable frame, a tray disposed within the frame, a pressure plate, and a pressing mechanism. The tray is used to place the 3D printed model. The frame has two axially opposed side plates and four circumferentially opposed side plates, all of which form a receiving space. as well as A curing device is used to cure a 3D printed model after liquid removal in a low-oxygen or oxygen-free environment, wherein the residual liquid on the surface of the 3D printed model is cured. The pressing mechanism includes a displacement plate, a pull plate, and a support base fixedly connected to the frame. The displacement plate, the pull plate, and the pressure plate are configured such that when the pull plate moves along a first axis X parallel to the support base, it drives the displacement plate to move along the first axis X, thereby driving the pressure plate to move closer to and away from the tray.

16. The system as described in claim 15, characterized in that, The threshold is less than half of the accuracy requirement of the 3D printed model.

17. The system as described in claim 15 or 16, characterized in that, The liquid removal device includes a drying assembly having an air outlet extending into the receiving space for blowing airflow toward the surface of the 3D printed model during the process of rotating the 3D printed model to spin dry, in order to assist in removing residual liquid from the surface of the 3D printed model opposite to the direction of centrifugal force.

18. The system according to claim 15 or 16, characterized in that, The liquid removal device includes a spin-drying device and a blow-drying device. The spin-drying device is used to rotate the 3D printed model to spin-dry it, and the blow-drying device is used to blow airflow onto the surface of the 3D printed model after spin-drying to help remove residual liquid from the surface of the 3D printed model opposite to the centrifugal force direction.

19. The system as described in claim 15 or 16, characterized in that, The frame is adapted to spin-dry the 3D printed model when it is placed in a first orientation and to spin-dry the 3D printed model when it is placed in a second orientation to remove liquid from the surface of the 3D printed model facing away from the centrifugal force direction, wherein the first orientation and the second orientation are opposite.

20. The system as described in claim 15, characterized in that, The curing device includes a cavity and a vacuum pump or a low-oxygen or oxygen-free protective gas supply system connected to the cavity.

21. The system as claimed in claim 20, characterized in that, The curing apparatus also includes a circulating cooling device connected to the cavity for circulating and cooling the protective gas.

22. The system as described in claim 15, characterized in that, The liquid removal device is adapted to support a carrier platform on which one or more of the three-dimensional printed models are attached.

23. The system as described in claim 22, characterized in that, Also includes: A detachment mechanism is used to detach the one or more 3D printed models from the carrier platform.

24. The system as described in claim 23, characterized in that, The curing device includes two opposing light sources for illuminating the 3D printed model from two directions.

25. The system as described in claim 22, characterized in that, The curing device includes: A first curing sub-device is used to illuminate a first side of the one or more 3D printed models with light; A second curing sub-device is used to illuminate the second side of the one or more 3D printed models opposite to the first side with light; The system also includes a detachment mechanism for detaching the one or more 3D printed models processed by the first curing sub-device from the support platform.

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