An inverted light-cured 3D printing device

Abstract

The application belongs to the field of additive manufacturing, and particularly relates to an inverted light-curing 3D printing device, which comprises a projector, a forming assembly and a spin-coating assembly; the spin-coating assembly comprises a feeding pipe and a horizontally arranged circular spin-coating disc, the center of the spin-coating disc is provided with a discharging hole penetrating through two surfaces of the spin-coating disc, and the discharging hole is rotatably connected with a discharging end of the feeding pipe; the projector is arranged below the spin-coating disc and has an emitting direction towards the spin-coating disc; the forming assembly comprises a forming table and a power element, the forming table is arranged on a side of the spin-coating disc away from the projector and comprises a surface parallel to the spin-coating disc; and the power element is used for moving the forming table to be close to or away from the spin-coating disc. The application has the effects of increasing a paving speed, reducing a paving thickness, improving a printing efficiency and a printing precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of additive manufacturing, in particular to an inverted light-curing 3D printing device. BACKGROUND

[0002] Digital Light Processing (DLP) is the second generation of light-curing forming technology in the late last century.

[0003] Compared with the Stereo Lithography Appearance (SLA) which uses a laser head to scan layer by layer, the DLP technology mainly uses a projector to cure the photosensitive polymer liquid layer by layer. The projector works every time to form a working section, without waiting for the scanning process, thereby creating a 3D printed object more efficiently.

[0004] However, due to the significant reduction in the curing process, the time ratio of the material laying process in each layer of printing is significantly increased. How to optimize the material laying efficiency and further reduce the printing time has become a problem to be solved. SUMMARY

[0005] In order to solve the above problems and improve the production efficiency in the light-curing 3D printing process, the present application provides an inverted light-curing 3D printing device.

[0006] The inverted light-curing 3D printing device provided by the present application adopts the following technical scheme:

[0007] An inverted light-curing 3D printing device, comprising a projector, a forming assembly, and a spin-coating assembly; the spin-coating assembly comprises a feeding pipe and a horizontally arranged spin-coating disc, the center of the spin-coating disc is provided with a discharge hole penetrating through two surfaces of the spin-coating disc, and the discharge hole is rotatably connected with the discharge end of the feeding pipe; the projector is arranged below the spin-coating disc and the light emission direction is towards the spin-coating disc; the forming assembly comprises a forming table and a power member, the forming table is arranged on the side of the spin-coating disc away from the projector and comprises a surface parallel to the spin-coating disc; and the power member is used to move the forming table close to or away from the spin-coating disc.

[0008] By adopting the above technical scheme, the metal slurry extruded from the feeding pipe is applied with a linear velocity under the rotation of the spin-coating disc, and then due to the insufficient centripetal force provided by the spin-coating disc, the metal slurry is thrown out to the surrounding under the action of inertia, forming a uniform material laying layer; then the projector irradiates the metal slurry under program control, so that the metal slurry in part of the area is solidified and fixedly connected with the forming table or the metal green body of the previous process, and the layers are stacked to form a complete workpiece.

[0009] Optionally, the molding assembly includes multiple molding stages arranged in a circular array with the center normal of the spin coating disk as the axis.

[0010] By adopting the above technical solution, after one material laying process, multiple forming platforms sink simultaneously, and the projector illuminates the areas corresponding to the multiple forming platforms, forming multiple working slices at one time, thus accelerating production efficiency.

[0011] Optionally, the molding assembly further includes a rotary table for rotating the molding table around the center normal of the spin coating disk, or the edge of the spin coating disk is provided with a barrier that surrounds the side of the spin coating disk close to the molding table.

[0012] By adopting the above technical solution, after one application of material, the forming table can be rotated to perform multiple curing processes at multiple workstations, thereby improving the utilization rate and productivity of the metal slurry. Furthermore, since it is the rotating table that rotates, rather than the spin coating disk, the metal slurry does not generate angular momentum during the relative rotation of the spin coating disk and the forming table, preventing the precision error caused by the metal slurry being thrown off.

[0013] Optionally, the spin coating assembly further includes multiple partitions, which are disposed on the side of the spin coating disk near the forming stage, dividing the forming stage into multiple fan-shaped areas; the rotation of the spin coating disk alternates between clockwise and counterclockwise.

[0014] By adopting the above technical solution, the partition separates different curing areas, so that when the molding stage is transferred from one curing area to another, the liquid level in the new curing area will not drop due to the lack of liquid in the previous area.

[0015] Optionally, the feed pipe includes multiple sub-feed pipes, each of which corresponds one-to-one with a sector area of ​​the forming table.

[0016] By adopting the above technical solution, different curing areas can be filled with different light-cured metals, ceramics or resin slurries, and the molding table can sequentially mold different materials on the same working surface, so that the final molded workpiece is made of composite materials.

[0017] Optionally, the forming assembly further includes a scraper, which is disposed on the side of the spin coating disk near the forming table, and the scraper is driven by the power component, causing the scraper to move away from or towards the spin coating disk.

[0018] By adopting the above technical solution, after each curing process, as the forming table rotates to the next curing station, the scraper rotates and moves on the surface of the spin coating plate, scraping off most of the residual metal slurry. A small portion adheres to the partition plate, converges under gravity, and is then thrown out in the next material spreading process, eliminating the need for a material removal process.

[0019] Optionally, the scraper is spaced apart from the forming table by one partition.

[0020] By adopting the above technical solution, when the forming table returns to the first curing station, the scraper can remove the residual metal slurry from all stations.

[0021] Optionally, the scraper is spaced two partitions from the forming table.

[0022] By adopting the above technical solution, even if the slurry with low viscosity is pushed by the scraper and overflows over the partition to the next curing station, the overflowing slurry will not affect the forming accuracy of the workpiece because the forming table has already passed the station.

[0023] Optionally, the spin coating disk is made of optical-grade transparent heating glass; the spin coating disk is connected to the feed tube via magnetic levitation or air-bearing.

[0024] By adopting the above technical solution, the metal slurry is heated while being laid on the surface of the spin coating disk, which reduces its viscosity and allows it to be better spread on the surface of the spin coating disk. Similarly, due to the decrease in viscosity, the metal slurry can be laid with a smaller thickness, achieving a lower working slice thickness and improving the accuracy of the finished workpiece. The setting of magnetic levitation or air-bearing can further reduce rotational friction, increase the rotation speed of the spin coating disk, and make the spin coating thinner and more uniform.

[0025] Optionally, the surface of the spin coating disk is provided with a release film, which is a coated film or a disposable peelable film.

[0026] By adopting the above technical solution, the cured metal blank is more thoroughly separated from the spin coating disc, avoiding workpiece deformation caused by tensile stress.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By using spin coating to achieve material placement, the efficiency of the material placement process is greatly improved, thereby increasing the overall production speed of DLP 3D printing;

[0029] 2. The partition divides the surface of the spin coating disk into sections, which can either execute multiple curing processes consecutively after a material laying process to achieve multiple working slices, or lay different materials in different sections to achieve additive manufacturing of composite materials;

[0030] 3. The design of the scraper and partition allows the forming table to remove residual metal slurry from the surface of the spin coating plate while switching between different curing stations, thus avoiding the impact of residual metal slurry on the next layer of material.

[0031] 4. The spin-coating disc heats the metal slurry, reduces the viscosity of the metal slurry, makes the laying more uniform and thinner, and achieves higher processing precision. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 Fig. 1 is a structural schematic diagram of an inverted light-curing 3D printing device according to Embodiment 1 of the present application;

[0033] Figure 2 Fig. 2 is a sectional schematic diagram of the inverted light-curing 3D printing device according to Embodiment 1 of the present application;

[0034] Figure 3 Fig. 3 is a structural schematic diagram of an inverted light-curing 3D printing device according to Embodiment 2 of the present application;

[0035] Figure 4 Fig. 4 is a structural schematic diagram of an inverted light-curing 3D printing device according to Embodiment 3 of the present application;

[0036] Figure 5 Fig. 5 is a sectional view of a metal green body with a forming table and staggered layer design according to Embodiment 3 of the present application;

[0037] Figure 6 Fig. 6 is a structural schematic diagram of an inverted light-curing 3D printing device according to Embodiment 4 of the present application;

[0038] Figure 7 Fig. 7 is a top view of the inverted light-curing 3D printing device according to Embodiment 4 of the present application after removal of the frame.

[0039] REFERENCE SIGNS

[0040] 1. Spin-coating assembly; 11. Spin-coating disc; 111. Discharge hole; 112. Partition; 113. Enclosure; 12. Feeding pipe;

[0041] 2. Forming assembly; 21. Forming table; 22. Power member; 221. Frame; 222. Screw rod; 223. Air cylinder; 23. Scraper;

[0042] 3. Projector;

[0043] 41. Metal slurry; 42. Metal green body; 421. Core material; 422. Shell. DETAILED DESCRIPTION

[0044] The following will be described in detail with reference to the accompanying drawings. Figures 1-7 The present application will be further described in detail.

[0045] The present application discloses an inverted light-curing 3D printing device.

[0046] Embodiment 1

[0047] Reference will be made to Figure 1 ,Figure 2 The inverted light-curing 3D printing device comprises a projector 3, a forming assembly 2, and a spin-coating assembly 1.

[0048] The spin-coating assembly 1 comprises a supply pipe 12 and a horizontally arranged spin-coating disc 11, which is an optical-grade transparent heating glass disc. A discharge hole 111 is formed in the center of the spin-coating disc 11 and penetrates through both sides of the disc. A magnetic suspension or air floating bearing is embedded in the discharge hole 111. The discharge end of the rigid supply pipe 12 is fixedly connected to the inner ring of the magnetic suspension or air floating bearing. The other end of the supply pipe 12 is connected to a tank through a supply pump. The side of the spin-coating disc 11 close to the supply pipe 12 and the tank is the lower surface, and the side away from the supply pipe 12 and the tank is the upper surface.

[0049] The spin-coating assembly 1 further comprises a rotating wheel abutting against the edge of the lower surface of the spin-coating disc 11, which is used to drive the spin-coating disc 11 to rotate forward and reverse, thereby achieving the effect of spin-coating.

[0050] Preferably, the air bearing is a tapered roller thrust bearing, and the recommended cone angle is 25°, which prevents the air bearing from being damaged by the axial force from the spin-coating disc 11.

[0051] Optionally, the edge of the spin-coating disc 11 is provided with a surrounding barrier 113 surrounding the upper surface of the entire spin-coating disc 11.

[0052] The projector 3 is arranged below the spin-coating disc 11, and the light emission direction is towards the spin-coating disc 11 and focuses on the surface on the other side of the spin-coating disc 11. The light source can be one or more of a DLP light source, an LCD light source, or an SLA low-power laser light source, and the wavelength of the light emitted by the light source is preferably 355 nm or 405 nm.

[0053] The forming assembly 2 comprises a forming table 21 and a power component 22. The forming table 21 is arranged on the side of the spin-coating disc 11 away from the projector 3 and comprises a forming surface opposite to the spin-coating disc 11, which is parallel to the spin-coating disc 11. The power component 22 is used to move the forming table 21 close to or away from the spin-coating disc 11. Specifically, the power component 22 comprises a lead screw 222 and a guide rod, which are parallel to the normal line of the spin-coating disc 11. A rack 221 is sleeved on the lead screw 222 and the guide rod. The forming table 21 is detachably connected to the rack 221. The rotation of the lead screw 222 drives the rack 221 to move along the guide rod, thereby moving the forming table 21 close to or away from the spin-coating disc 11. When the power component 22 is at the lower limit position, the gap between the forming surface and the spin-coating disc 11 is less than the thickness of the working section of 3D printing. When the power component 22 is at the upper limit position, the gap between the forming surface and the spin-coating disc 11 is greater than the maximum printing height of the inverted light-curing 3D printing device.

[0054] The rotation of the rotating wheel and the lead screw 222 and the exposure of the projector 3 are independently controlled by computer programming.

[0055] Optionally, a recovery groove is arranged at the outer edge of the spin plate 11 to receive the spun-off metal slurry 41 and concentrate it into the recovery groove box.

[0056] The DLP 3D printing includes a material laying process, a solidification process, and a material removing process, which are sequentially performed and executed in cycles to print out a layer-by-layer work section, and the work sections are stacked to form a workpiece.

[0057] In the printing start state, the spin plate 11 is free of the metal slurry 41, the forming table 21 is away from the spin plate 11, and the spin plate 11 is heated.

[0058] In the material laying process, the spin wheel is started while the feed pump is started, and the metal slurry 41 is uniformly spun and coated on the entire upper surface of the spin plate 11 under the action of the centrifugal force, and the thickness of the metal slurry 41 is equal to or greater than the thickness of the work section.

[0059] In the solidification process, the spin wheel and the feed pump are stopped.

[0060] The screw rod 222 rotates, the rack 221 descends along the guide rod, and the forming surface of the forming table 21 or the metal green body 42 is attached to or slightly immersed in the upper liquid surface of the metal slurry 41, and the gap between the forming surface and the upper surface of the spin plate 11 is the thickness of the work section. It should be noted that if the proportioning of the metal slurry 41 results in a non-negligible shrinkage, the gap between the forming surface and the upper surface of the spin plate 11 should consider the solidification shrinkage factor and be appropriately greater than the thickness of the work section.

[0061] The projector 3 performs partial exposure on the metal slurry 41 between the forming table 21 and the spin plate 11, and the specific exposure area is controlled by the digital signal. The solidified components in the metal slurry are solidified after being irradiated by the light, so that the metal slurry 41 in the corresponding area is solidified to form the metal green body 42.

[0062] It should be noted that the thickness of the work section in the first layer solidification is the gap between the forming surface and the spin plate 11, and in the subsequent processes, the thickness of the work section is the gap between the green body formed in the previous step and the spin plate 11.

[0063] In another embodiment of the present embodiment, the material spun is a photocurable ceramic or resin slurry.

[0064] In the material removing process, the screw rod 222 rotates, the forming table 21 is lifted to separate the metal green body 42 from the metal slurry 41, the projector 3 is turned off, and the spin wheel rotates to spin off the residual metal slurry 41 on the surface of the spin plate 11.

[0065] Optionally, a release film is laid on the upper surface of the spin plate 11 at the beginning of the material laying process, and then the release film and the residual metal slurry 41 thereon are removed in the material removing process.

[0066] The implementation principle of embodiment 1 is:

[0067] When the spin-coating disc 11 rotates, the metal slurry 41 on it is driven to move. Since the friction between the metal slurry 41 and the spin-coating disc 11 cannot provide sufficient centripetal force, the metal slurry 41 is thrown out under the action of inertia, away from the center, and gradually spreads and covers the entire upper surface of the spin-coating disc 11.

[0068] The glass plate is heated, the viscosity of the metal slurry 41 is reduced, the fluidity is increased, the material can be laid more quickly, and the minimum thickness of the laid material is reduced, that is, the work slice is thinner, and the printed workpiece is more delicate.

[0069] Embodiment 2

[0070] With reference to Figure 3 The difference between this embodiment and embodiment 1 is:

[0071] The forming assembly 2 of this embodiment includes a plurality of forming tables 21, which are detachably connected to the rack 221, and the forming surfaces of each forming table 21 are located at the same horizontal plane. All the forming tables 21 are distributed in a circumferential array with the center normal of the upper surface of the spin-coating disc 11 as the axis.

[0072] It should be noted that if a single projector 3 is insufficient in power or the projection angle is limited and cannot focus multiple forming surfaces, multiple projectors 3 need to be additionally arranged to meet the demand.

[0073] The implementation principle of embodiment 2 is:

[0074] In the curing process, as the rack 221 descends, the plurality of forming surfaces simultaneously contact the metal slurry 41, and under the irradiation of the projector 3, the plurality of workstations simultaneously form, which doubles the production efficiency on the one hand and greatly increases the utilization rate of the slurry in the same laying process on the other hand. Although the unused metal slurry can be recycled and reused, considering the recycling loss and the cost and time cost of the laying process, the ability to form multiple work slices in the same laying process still reduces the production cost.

[0075] Embodiment 3

[0076] With reference to Figure 4 The difference between this embodiment and embodiment 1 is:

[0077] A plurality of partitions 112 are arranged on the upper surface of the spin-coating disc 11, which are distributed along the radial direction of the spin-coating disc 11 and divide the upper surface of the spin-coating disc 11 into a plurality of fan-shaped areas.

[0078] Optionally, the forming assembly 2 further comprises a rotating table, the frame 221 and the forming table 21 are fixedly connected with the rotating table, so that the forming table 21 can rotate relative to the frame 221, and the axis of rotation is the normal line of the center of the spin-coating disc 11.

[0079] Optionally, the supply pipe 12 comprises a plurality of supply pipes 12 and a rigid sleeve, the number of the supply pipes 12 corresponds to the number of the fan-shaped areas, and the discharge hole 111 is also divided into a plurality of sub-discharge holes 111 by the partition plate 112 and located at the central angle of the fan-shaped area. One end of each supply pipe 12 is connected with the sub-discharge hole 111 of the corresponding fan-shaped area, and the other end is connected with the tank. The rigid sleeve is sleeved outside all the supply pipes 12 and is inserted into the discharge hole 111, and the spin-coating disc 11 is rotatably connected with the rigid sleeve through the air bearing.

[0080] In the material laying process of the embodiment, the rotating wheel rotates alternately in the forward and reverse directions, so that the spin-coating disc 11 also switches the rotation direction clockwise and counterclockwise. For the case where the supply pipe 12 exists, different supply pipes 12 can be connected with different tanks to realize the laying of multiple slurries.

[0081] In the solidification process of the embodiment, when the forming table 21 completes the solidification in the first fan-shaped area, the forming table 21 is lifted, and the gap between the metal green body 42 and the spin-coating disc 11 is at least the height of the partition plate 112; the rotating wheel is started or the rotating table is operated, so that the forming table 21 is relatively rotated and aligned with the second fan-shaped area; the forming table 21 is lowered, so that the metal green body 42 is in contact with the metal slurry 41 in the second fan-shaped area; the projector 3 is started, so that the metal slurry 41 is solidified; and the cycle is repeated until all the fan-shaped areas have undergone the solidification process once, and then the material removing process and the material laying process are repeated.

[0082] In particular, for the case where the workpiece is composed of different materials, the slices of different materials are designed as error layers.

[0083] Reference Figure 5 In particular, for the case where the workpiece is composed of different materials, the slices of different materials are designed as error layers.

[0083] Reference Figure 5 In particular, for the case where the workpiece is composed of different materials, the slices of different materials are designed as error layers.

[0083] Reference Figure 5 In particular, for the case where the workpiece is composed of different materials, the slices of different materials are designed as error layers.

[0084] It should be noted that if part of the green body is immersed in the metal slurry 41, the rise of the liquid surface after the green body is immersed can be considered to appropriately reduce the amount of material from the perspective of saving materials.

[0085] The implementation principle of Example 3 is:

[0086] Because each sector is separated by the partition 112, when one sector completes the solidification operation and the forming table 21 is lifted, it does not affect the metal slurry 41 in other sectors, and one paving can complete the forming work of multiple operation slices.

[0087] For the case where the workpiece is formed by different materials, on the one hand, the design of multiple supply pipes 12 enables each material to be formed at one time, not only improving production efficiency, but also enabling the formation of process designs that cannot be completed in batches; on the other hand, the staggered design of the slices enables the green body of the first formed material to not come into contact with the spin coating disc 11 when the material formed lags behind is solidified, avoiding the decrease in forming precision caused by the green body impacting or rolling the metal slurry 41.

[0088] Example 4

[0089] Referring to Figure 6 , Figure 7 The difference between this embodiment and Example 3 is:

[0090] The forming assembly 2 further includes a scraper 23, and the power member 22 includes a pneumatic cylinder 223, the scraper 23, the forming table 21, and the rack 221 are connected through the pneumatic cylinder 223 and can be independently controlled to control the gap between the scraper 23 and the spin coating disc 11. The central angle of the geometric center of the scraper 23 and the forming table 21 relative to the center of the spin coating disc 11 is half of the angle between the two partitions 112, and when the forming table 21 is in the solidification process, the scraper 23 is located in the last sector and is in contact with the partition 112 close to the side of the forming table 21.

[0091] When the spin coating disc 11 rotates relative to the rack 221, the scraper 23 first lifts over the partition 112 and then sinks to abut against the upper surface of the spin coating disc 11, and with the rotation, the forming table 21 reaches the next solidification process position, the scraper 23 scrapes the sector of the last solidification process, and most of the residual metal slurry 41 is scraped off the spin coating disc 11, and a small part adheres to the partition 112 and is thrown out in the next paving process.

[0092] The implementation principle of Example 4 is:

[0093] For the inverted light-curing 3D printing device with the specification of the spin-coating disc 11, the proportion of the residual metal slurry 41 after the curing process is determined by the design of the workpiece. If there is too much residual metal slurry 41 on the surface of the spin-coating disc 11 before the material removal process, the material removal process may not be completed, which affects the flatness of the subsequent material laying.

[0094] In the case where one material laying process corresponds to multiple curing processes, when the gantry 221 and the spin-coating disc 11 rotate relative to each other, the scraper scrapes the part of the spin-coating disc 11 on which the curing process has been performed, and most of the residual metal slurry 41 is scraped out of the spin-coating disc 11, and a small amount of the residual metal slurry 41 adheres to the surface of the partition plate 112. The part adhering to the partition plate 112 is collected downward under the action of gravity, and is then thrown out before the next material laying in the material laying process, which optimizes the flatness of the material laying and omits the material removal process, thereby further increasing the printing efficiency.

[0095] Embodiment 5

[0096] The difference between this embodiment and embodiment 4 is that:

[0097] In this embodiment, the central angle of the geometric center of the scraper 23 and the forming table 21 relative to the center of the spin-coating disc 11 is one and a half times the included angle between the two partition plates 112.

[0098] Suppose that the sector region directly opposite the forming table 21 in the first curing process after the material laying process is the first region, the sector region directly opposite the forming table 21 in the second curing process is the second region, and the sector region directly opposite the forming table 21 in the last curing process before the material removal process is the zeroth region. When the last curing process is completed and the spin-coating disc 11 and the gantry 221 rotate relative to each other to the next station, the forming table 21 corresponds to the first region, and the scraper 23 is still in the sector region before the zeroth region, and needs to continue to rotate by a central angle of one sector region, so that the scraper 23 scrapes off the residual slurry in the zeroth region.

[0099] The implementation principle of embodiment 5 is that:

[0100] The station at which the scraper 23 scrapes off the residual slurry is separated from the station at which the forming table 21 is about to cure by an entire sector region that has been formed. For the metal slurry 41 with a smaller viscosity, even if a small amount of residual slurry overflows the partition plate 112 to the next sector region during the scraping process, it will not affect the forming accuracy.

[0101] The above are preferred embodiments of the present application, and the number and size of the technical features shown are only the settings in the current embodiments, which do not limit the protection scope of the present application. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An inverted light-cured 3D printing apparatus, characterized by, The application relates to a projection device for manufacturing a film, which comprises a projector (3), a forming assembly (2) and a spin coating assembly (1); the spin coating assembly (1) comprises a feeding pipe (12) and a horizontally arranged circular spin coating disc (11), the center of the spin coating disc (11) is provided with a discharging hole (111) penetrating through two surfaces of the spin coating disc (11), the discharging hole (111) is rotatably connected with a discharging end of the feeding pipe (12); the projector (3) is arranged below the spin coating disc (11) and the light emitting direction is towards the spin coating disc (11); the forming assembly (2) comprises a forming table (21) and a power element (22), the forming table (21) is arranged on a side of the spin coating disc (11) away from the projector (3) and comprises a surface opposite to the spin coating disc (11); the power element (22) is used for making the forming table (21) close to or away from the spin coating disc (11). The spin coating disc (11) is optical grade transparent heating glass; the spin coating disc (11) is connected with the feeding pipe (12) through magnetic suspension or air bearing. The forming assembly (2) further comprises a scraper (23), the scraper (23) is arranged on a side of the spin coating disc (11) close to the forming table (21), and the scraper (23) is driven by the power element (22) so that the scraper (23) is away from or close to the spin coating disc (11).

2. The inverted light solidification 3D printing device of claim 1, wherein, The forming assembly (2) comprises a plurality of forming tables (21), and the forming tables (21) are arranged in a circumferential array with the center normal line of the spin coating disc (11) as the axis.

3. The inverted light solidification 3D printing device of claim 1, wherein, The forming assembly (2) further comprises a rotating table for rotating the forming table (21) around the center normal line of the spin coating disc (11); or, an edge of the spin coating disc (11) is provided with a fence (113) for surrounding a side of the spin coating disc (11) close to the forming table (21).

4. The inverted light solidification 3D printing device of claim 1, wherein, The spin coating assembly (1) further comprises a plurality of partitions (112) arranged on a side of the spin coating disc (11) close to the forming table (21) and separating the forming table (21) into a plurality of fan-shaped areas; the spin coating disc (11) rotates clockwise and counterclockwise alternately.

5. The inverted light solidification 3D printing device of claim 4, wherein, The feeding pipe (12) comprises a plurality of feeding pipes, each feeding pipe corresponds to a fan-shaped area of the forming table (21) one by one.

6. The inverted light solidification 3D printing device of claim 4, wherein, The scraper (23) is spaced apart from the forming table (21) by one partition (112).

7. The inverted light solidification 3D printing device of claim 4, wherein, The scraper (23) is spaced apart from the forming table (21) by two partitions (112).

8. The inverted light solidification 3D printing device of claim 1, wherein, The surface of the spin coating disc (11) is provided with a release film, and the release film is a plated film or a disposable peelable film.

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