Complete demolding 3D printing platform

Abstract

The invention discloses a 3D printing platform capable of achieving complete demolding, and belongs to the technical field of additive manufacturing through 3D printing and photocuring, the 3D printing platform comprises a workbench, a forming table and a lifting module, the workbench comprises a platen, a printing module and a curing mechanism, and the 3D printing platform further comprises a support, a protection plate and supporting legs which are arranged on the outer side of the workbench; the curing mechanism comprises a closed mounting frame, a DLP light source and a radiator, and is characterized in that the printing module comprises a trough, a composite release film, a high borosilicate glass bearing plate and a vibration separation assisting assembly which are sequentially arranged from top to bottom, the bottom face of the composite release film is connected with the upper surface of the high borosilicate glass bearing plate in an attached mode, and the workbench further comprises a ventilation assembly and an auxiliary heat dissipation assembly; the ventilation assembly and the auxiliary heat dissipation assembly are installed on the two sides of the closed installation frame correspondingly. The device has the advantages of being high in printing efficiency, good in demolding effect and high in thermal management system efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of additive manufacturing technology through 3D printing and photocuring, and particularly relates to a 3D printing platform with complete demolding. Background Art

[0002] The photocuring 3D printing technology cures liquid photosensitive resin layer by layer with ultraviolet light and is widely used in the field of precision component manufacturing.

[0003] However, there are significant technical bottlenecks in the demolding process and thermal management of existing printing platforms: the demolding efficiency and integrity are insufficient, specifically manifested as defects in interface adhesion control, single peeling assistance mechanism, limitations in the mechanical properties of the release film, etc. In addition, there are defects in the low efficiency of the thermal management system, and problems such as out-of-control temperature in the cured area and unreasonable air flow circulation path are likely to occur.

[0004] Traditional printing platforms mostly use a single-layer release film. The uniform distribution of its surface energy leads to concentrated peeling force. When demolding complex structure models such as those with barbs and thin-walled components, edge tearing or local residue is likely to occur. Before the problem of coordinated control of edge anchoring and low adhesion in the center is solved, the release film is easily pulled up as a whole, resulting in limited effective printing area. Summary of the Invention

[0005] The purpose of the present invention is to provide a 3D printing platform with complete demolding in order to solve the problems such as insufficient demolding efficiency and integrity and low efficiency of the thermal management system existing in common photocuring 3D printing devices.

[0006] The present invention realizes the above purpose through the following technical solutions: It includes a workbench, a forming table and a lifting module. The workbench includes a table board, a printing module and a curing mechanism, and also includes a bracket, a guard plate and feet arranged outside the workbench. The curing mechanism includes a closed installation frame, a DLP light source and a radiator. The printing module includes a material tank, a composite release film, a high borosilicate glass bearing plate and a vibration-assisted demolding component arranged in sequence from top to bottom. The bottom surface of the composite release film is attached to the upper surface of the high borosilicate glass bearing plate. The workbench also includes a ventilation component and an auxiliary heat dissipation component, and the ventilation component and the auxiliary heat dissipation component are respectively installed on both sides of the closed installation frame.

[0007] Further, the platen is a double-layer plate-like splicing structure up and down, and square holes are penetrated in the middle. A film embedding groove is provided on the upper splicing plate to support the composite release film. Arc-shaped support plates are fixedly provided at the four corners of the square hole on the lower splicing plate to support the borosilicate glass bearing plate. Column-shaped limiting grooves are horizontally provided inside the double-layer plate-like splicing structure up and down. The vibration-assisted release assembly is arranged inside the two column-shaped limiting grooves, and a vertical column-shaped installation groove is also opened at one end of the column-shaped limiting groove. The column-shaped installation groove is communicated with the column-shaped limiting groove, and the other end of the column-shaped limiting groove is communicated with the square hole.

[0008] Further, the composite release film includes a polyurea polymer film on the upper layer and a colorless polyimide film on the lower layer. The polyurea polymer film and the colorless polyimide film are adhered together after being attached. A fluorosilicate coating containing silicon dioxide nanoparticles is coated on the central area of the upper surface of the polyurea polymer film, and an acrylate coating is also coated on the edge area of the upper surface of the polyurea polymer film. The area of the polyurea polymer film is larger than the area of the colorless polyimide film.

[0009] Further, the polyurea polymer film has high elasticity. When the printed product is lifted upward, it forms an elastic buffer to avoid breakage and damage on the surface of the composite release film and being forcibly pulled up to separate from the borosilicate glass bearing plate. The colorless polyimide film has higher hardness and can be used as a stable bottom support and connection structure to tightly connect the composite release film with the borosilicate glass bearing plate and avoid the composite release film being separated from the borosilicate glass bearing plate under the influence of external forces.

[0010] Further, an acrylate material with a higher surface energy is coated on the edge area (non-printing area) of the composite release film to form a coordinated structure of "low surface energy in the center + high adhesion at the edge", reducing the adhesion force between the printed product and the central area of the composite release film. At the same time, the high adhesion in the edge area ensures the fixation of the printed product and the edge of the composite release film, and can increase the area of the fluorosilicate coating to increase the area of the actual printing area.

[0011] Further, the ventilation assembly includes an air inlet pipe row and an air delivery pipe row. The air inlet pipe row and the air delivery pipe row are respectively installed on both sides of the closed installation frame and penetrate through its side wall. A straight-row pipe fitting is inserted outside the air inlet pipe row and fixed by screws. The straight-row pipe fitting is used to collect the multiple pipes of the air inlet pipe row into the same pipe orifice. A small air pump is provided below the side of the air inlet pipe row, and the output end of the small air pump is connected to the pipe orifice of the straight-row pipe fitting through a pipe. A dust-proof cover is provided outside the input end of the small air pump and connected through a pipe. The dust-proof cover penetrates through the outer protection plate of the workbench and is fixed to the connecting piece by screws.

[0012] Furthermore, the ventilation component injects air into the inner side of the curing mechanism. This not only cools the DLP light source area, but also the excess trapped air will spontaneously diverge upward, passing through the borosilicate glass carrier plate and the composite release film to form an air isolation layer above the release film, facilitating demolding.

[0013] Furthermore, the auxiliary heat dissipation component includes a vertical straight pipe fitting. The vertical straight pipe fitting is inserted outside the gas pipeline row and fixed by screws. Inside the vertical straight pipe fitting, there is an air flow channel with an inverted L-shaped cross-section. At the bottom of the vertical straight pipe fitting, there is an air receiving box. The air receiving box is a square hollow box body. The top of the air receiving box is connected to the air flow channel in a through manner. On one side of the air receiving box, there are several square protrusions, and the middle of the square protrusions is a hole structure and is connected to the internal space of the air receiving box.

[0014] Furthermore, the radiator is a fin-type radiator. The square protrusions are clamped between adjacent fins of the radiator, and the opening of the hole structure is vertically arranged relative to the fin direction.

[0015] Furthermore, the platen is a double-layer plate-like splicing structure with square holes drilled through the middle. Among them, a film embedding groove is provided on the upper splicing plate to support the composite release film. Arc-shaped support plates are fixedly provided at the four corners of the square holes on the lower splicing plate to support the borosilicate glass carrier plate. Column-shaped limiting grooves are horizontally provided inside the double-layer plate-like splicing structure. The vibration-assisted demolding component is arranged inside the two column-shaped limiting grooves, and a vertical column-shaped installation groove is also opened at one end of the column-shaped limiting groove. The column-shaped installation groove is connected to the column-shaped limiting groove, and the other end of the column-shaped limiting groove is connected to the square hole.

[0016] Furthermore, the vibration-assisted demolding component is an ultrasonic vibrator. The ultrasonic vibrator is composed of an ultrasonic transducer and an ultrasonic horn. One end of the ultrasonic horn is in contact with the side surface of the borosilicate glass carrier plate. The ultrasonic horn is embedded in the column-shaped limiting groove and is movably connected. The ultrasonic transducer is installed in the column-shaped installation groove.

[0017] Furthermore, a number of micro-holes are arrayed on the composite release film, and the diameter of the micro-holes on the film is between 10 and 15 nm.

[0018] Furthermore, compared with the full-coverage film, the centrifugal force of the composite release film is smaller, and the micro-holes on the film can allow oxygen to pass through. After the oxygen penetrates the upper surface of the composite release film, an air flow barrier layer can be formed between the contact surface of the printed product and the composite release film. Therefore, the formed printed product does not directly contact the composite release film, thereby improving the separation speed of the printed product from the release film.

[0019] Furthermore, the model generates a large amount of heat during the molding process. Air passes through the micropores on the composite release film, taking away some of the heat from the release film to achieve an air cooling effect, indirectly increasing the printing speed of the light-curing 3D printing equipment in this solution, which is 1.2 to 1.3 times that of a conventional single-layer release film printer.

[0020] Furthermore, a plurality of micro-holes are arranged in an array on the high borosilicate glass support plate, and the diameter of the micro-holes on the plate is between 0.02 mm and 0.1 mm.

[0021] Furthermore, the composite release film can increase the speed of model detachment, but it cannot solve the problem of pulling up the release film when the printed product is detached. Because the release film is stretched over the material and put down again, the central area of the release film is concave, making it difficult to achieve large-area printing. The optimal printing area is still the central area of the release film, and the printing efficiency is low. The composite release film is bonded to a transparent borosilicate glass support plate to prevent the composite release film from being lifted up by the printed product, thereby increasing the area of the actual printing area and achieving the purpose of large-area printing. In addition, the synergistic effect of the micropores on the plate and the composite release film reduces the adhesion between the printed product and the composite release film, so that the printing efficiency will not be affected by the large adhesion when printing over a large area.

[0022] Beneficial effects: The present invention is reasonably designed and has the following beneficial effects: 1. In the solution of the present invention, the composite release film cooperates with the demoulding structure to improve the peeling efficiency. It adopts a double-layer composite structure of polyurea polymer film + colorless polyimide film. The upper polyurea film, with its high elasticity, forms an elastic buffer layer during the lifting process of the printed product, preventing the release film surface from breaking due to stress concentration; the lower polyimide film provides rigid support, inhibiting excessive deformation of the release film and ensuring the stability of the printing area. 2. In the present invention, the surface coating is designed to form functional zones with low surface energy in the center and high adhesion at the edges. The fluorosilicone coating containing silica nanoparticles in the center significantly reduces resin adhesion. The high adhesion generated by the chemical anchoring effect of the acrylic coating at the edge ensures that the printed resin is fixed to the edge of the composite release film, preventing overall peeling and effectively increasing the actual printing area. Combined with the microporous structure on the film, the oxygen released during printing forms an air film barrier layer on the contact surface, reducing the peeling force to one-third of that of traditional release films, achieving tear-free and rapid demolding. 3. In the scheme of the present invention, vibration-assisted demolding and micro-ventilation are coupled to enhance demolding integrity. The vibration-assisted demolding component periodically transmits vibrations to the high-borosilicate glass support plate through an ultrasonic vibrator, causing high-frequency vibrations on the surface of the high-borosilicate glass support plate, destroying the mechanical bite between the model and the support plate. At the same time, the micropores on the support plate with matching diameters form a through ventilation path with the micropores on the membrane. When printing is completed, the lifting module drives the forming table to rise, and the microporous structure quickly balances the air pressure difference between the membrane plate, avoiding model residue caused by vacuum adsorption; 4. In the present invention, the directional heat dissipation system optimizes the light-curing environment ventilation assembly and the auxiliary heat dissipation assembly to construct a three-dimensional heat dissipation channel. A small air pump inputs filtered air to the curing mechanism through straight pipes, and the air is evenly distributed to the curing area through the intake pipe. The inverted L-shaped air flow channel of the auxiliary heat dissipation assembly guides the airflow vertically through the finned heat sink. The block-shaped protrusions are embedded in the gaps between the fins to form a high-speed airflow area, which keeps the surface temperature of the DLP light source and the heat sink stable at a low valve range. This not only extends the life of the light source, but also significantly improves the dimensional accuracy of the printed parts by controlling the temperature gradient of the carrier plate, effectively solving the problems of resin viscosity changes and component warping caused by high temperature. 5. In the present invention, microporous cooling and adaptability to large-area printing break through. The microporous array of the composite release film and the borosilicate carrier plate forms a passive heat dissipation + active air cooling composite system. When air flows through the micropores, it can remove some of the curing heat on the surface of the release film, shortening the curing time of single-layer printing and improving the overall printing speed. At the same time, the rigid support of the carrier plate firmly fixes the release film on the surface and maintains a constant position. Combined with the anchoring effect of the edge coating, the effective printing area is expanded from a center radius of 100mm to the full width, meeting the molding requirements of large-scale components and filling the performance gap of traditional flexible release film platforms in large-area printing. 6. In the solution of the present invention, a through ventilation structure is formed by the microporous array of the high borosilicate glass bearing plate and the composite release film. When the molding table rises after printing is completed, the outside air is filtered by the guard plate dust cover and then forms a rapid air isolation layer with a thickness of about 5 - 10 μm between the upper surface of the composite release film and the bottom surface of the printed product through the air flow path driven by the small air pump. This isolation layer improves the demolding performance through a dual mechanism: on the one hand, the small-diameter micropores allow oxygen molecules to preferentially pass through, inhibiting the excessive cross-linking of the resin on the surface of the release film during the photocuring process, forming a low-adhesion interface layer with a thickness of about 20 - 50 μm, reducing the effective contact area between the printed product and the release film from 95% of the traditional full-contact structure to less than 40%; on the other hand, when the molding table drives the model to move upward, the diameter difference between the micropores on the plate and the micropores on the film forms a pressure gradient, and air quickly replenishes to the peeling interface through the micropores, avoiding the adhesion of the model caused by vacuum adsorption. Combined with the low-frequency vibration of the vibration-assisted demolding component, it can shorten the demolding time of complex curved surface models and reduce the edge breakage rate of the model during the peeling process. It is especially suitable for precision components with barbs and deep cavity structures. Through the synergistic effect of the air film support + interface weakening of the air isolation layer, it realizes complete demolding without tearing and residue, significantly improving the qualified rate and production efficiency of photocured 3D printing. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a schematic partial structural diagram of the present invention; Figure 3 It is a schematic structural diagram of the table board of the present invention; Figure 4 It is an enlarged view of the partial A structure of the present invention; Figure 5 It is a schematic structural diagram of the composite release film of the present invention; Figure 6 It is a schematic structural diagram of the ventilation component of the present invention; Figure 7 It is a schematic structural diagram of the auxiliary heat dissipation component of the present invention; Figure 8 It is a cross-sectional view of the structure of the auxiliary heat dissipation component of the present invention; Figure 9 It is a cross-sectional view of the structure of the vibration-assisted demolding component of the present invention.

[0024] In the figure: 1 - workbench, 2 - molding table, 3 - lifting module; 11 - table board, 12 - printing module, 13 - curing mechanism, 14 - ventilation component, 15 - auxiliary heat dissipation component; 1101 - Upper splicing plate, 1102 - Lower splicing plate, 1103 - Square hole, 1104 - Film slot, 1105 - Arc-shaped support plate, 1106 - Cylindrical limit groove, 1107 - Cylindrical installation groove, 1201 - Material tank, 1202 - Composite release film, 1203 - Borosilicate glass bearing plate, 1204 - Vibration-assisted release component, 1301 - Closed installation frame, 1302 - DLP light source, 1303 - Radiator, 1401 - Air inlet row, 1402 - Air delivery pipe row, 1403 - Straight pipe fittings in a row, 1404 - Small air pump, 1405 - Dust cover, 1501 - Vertical straight pipe fittings, 1502 - Air flow channel, 1503 - Air receiving box, 1504 - Square convexity; 12021 - Polyurea polymer film, 12022 - Colorless polyimide film, 12023 - Fluorosilicate coating containing silicon dioxide nanoparticles, 12024 - Acrylate coating, 12025 - Micro holes on the film, 12031 - Micro holes on the plate, 12041 - Ultrasonic transducer, 12042 - Ultrasonic horn, 12043 - Rubber gasket, 12044 - Fastening ring, 12045 - Spring, 12046 - Small vibration motor, 12047 - Eccentric block. Detailed implementation manner

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0027] Combine Figures 1 to 9A complete demoulding 3D printing platform as shown, including a workbench 1, a forming table 2 and a lifting module 3. The workbench 1 includes a table board 11, a printing module 12 and a curing mechanism 13, and also includes a bracket, a guard plate and a supporting leg arranged outside the workbench 1. The curing mechanism 13 includes a closed installation frame 1301, a DLP light source 1302 and a radiator 1303. The printing module 12 includes a material tank 1201, a composite release film 1202, a borosilicate glass bearing plate 1203 and a vibration-assisted demoulding component 1204 arranged in sequence from top to bottom. The bottom surface of the composite release film 1202 is attached to the upper surface of the borosilicate glass bearing plate 1203. The workbench 1 further includes a ventilation component 14 and an auxiliary heat dissipation component 15, and the ventilation component 14 and the auxiliary heat dissipation component 15 are respectively installed on both sides of the closed installation frame 1301.

[0028] Combined Figures 2 to 4 As shown, the table board 11 is a double-layer plate-like splicing structure up and down, and square holes 1103 are all penetrated in the middle. Among them, a thin film embedding groove 1104 is provided on the upper splicing plate 1101 to support the composite release film 1202. Arc-shaped supporting plates 1105 are fixedly provided at the four corners of the square holes 1103 on the lower splicing plate 1102 to support the borosilicate glass bearing plate 1203. Columnar limiting grooves 1106 that are thick at both ends and thin in the middle are horizontally arranged inside the double-layer plate-like splicing structure up and down. The vibration-assisted demoulding component 1204 is arranged inside the two columnar limiting grooves 1106, and a vertical columnar installation groove 1107 is also opened at one end of the columnar limiting groove 1106. The columnar installation groove 1107 is communicated with the columnar limiting groove 1106, and the other end of the columnar limiting groove 1106 is communicated with the square hole 1103.

[0029] Combined Figure 5 As shown, the composite release film 1202 includes a polyurea high molecular polymer film 12021 on the upper layer and a colorless polyimide film 12022 on the lower layer. The polyurea high molecular polymer film 12021 and the colorless polyimide film 12022 are attached and connected. A fluorosilicon coating 12023 containing silicon dioxide nanoparticles is coated on the central area of the upper surface of the polyurea high molecular polymer film 12021, and an acrylate coating 12024 is also coated on the edge area of the upper surface of the polyurea high molecular polymer film 12021. The area of the polyurea high molecular polymer film 12021 is larger than the area of the colorless polyimide film 12022.

[0030] Combined Figure 2 With Figure 6As shown, the ventilation component 14 includes an intake pipe row 1401 and an air delivery pipe row 1402. The intake pipe row 1401 and the air delivery pipe row 1402 are respectively installed on both sides of the closed installation frame 1301 and penetrate through its side wall. A straight row-shaped pipe fitting 1403 is inserted outside the intake pipe row 1401 and fixed by screws. The straight row-shaped pipe fitting 1403 is used to gather the multiple pipes of the intake pipe row 1401 into the same pipe orifice. A small air pump 1404 is provided below the intake pipe row 1401, and the output end of the small air pump 1404 is connected to the pipe orifice of the straight row-shaped pipe fitting 1403 through a pipe. A dust-proof cover 1405 is provided outside the input end of the small air pump 1404 and is connected through a pipe. The dust-proof cover 1405 penetrates through the outer protection plate of the workbench 1 and is fixed to the connecting part by screws.

[0031] Combined with Figure 2 and Figure 7 As shown, the auxiliary heat dissipation component 15 includes a vertical straight row-shaped pipe fitting 1501. The vertical straight row-shaped pipe fitting 1501 is inserted outside the air delivery pipe row 1402 and fixed by screws. An air flow channel 1502 with an inverted L-shaped cross-section is provided inside the vertical straight row-shaped pipe fitting 1501. An air receiving box 1503 is provided at the bottom of the vertical straight row-shaped pipe fitting 1501. The air receiving box 1503 is a square hollow box body. The top of the air receiving box 1503 is connected to the air flow channel 1502 in a through manner. A number of square-shaped protrusions 1504 are provided on one side of the air receiving box 1503, and the middle part of the square-shaped protrusions 1504 is a hole structure and is connected to the internal space of the air receiving box 1503.

[0032] Combined with Figure 2 and Figure 7 As shown, the radiator 1303 is a fin-type radiator. The square-shaped protrusions 1504 are clamped between adjacent fins of the radiator 1303, and the opening of the hole structure is arranged perpendicular to the fin direction.

[0033] Combined with Figure 3 、 Figure 4 and Figure 9 As shown, the table board 11 is a double-layer plate-like splicing structure up and down and is provided with square holes 1103 penetrating through the middle. Among them, a film embedding groove 1104 is provided on the upper splicing plate 1101 for supporting the composite release film 1202. Arc-shaped support plates 1105 are fixed at the four corners of the square holes 1103 on the lower splicing plate 1102 for supporting the high borosilicate glass bearing plate 1203. Column-shaped limiting grooves 1106 are horizontally provided inside the double-layer plate-like splicing structure up and down. The vibration-assisted stripping component 1204 is arranged inside the two column-shaped limiting grooves 1106, and a vertical column-shaped installation groove 1107 is further opened at one end of the column-shaped limiting groove 1106. The column-shaped installation groove 1107 is communicated with the column-shaped limiting groove 1106, and the other end of the column-shaped limiting groove 1106 is communicated with the square hole 1103.

[0034] Combined with Figure 9As shown, the vibration-assisted demolding component 1204 is an ultrasonic vibrator, which is composed of an ultrasonic transducer 12041 and an ultrasonic horn 12042. One end of the ultrasonic horn 12042 is connected to the side surface of the borosilicate glass carrier plate 1203. The ultrasonic horn 12042 is embedded in the cylindrical limiting groove 1106 and is movably connected, and the ultrasonic transducer 12041 is installed in the cylindrical installation groove 1107.

[0035] Combined with Figure 5 As shown, a number of micro-holes 12025 are arrayed on the composite release film 1202, and the diameter of the micro-holes 12025 is between 10 and 15 nm.

[0036] Combined with Figure 2 And Figure 9 As shown, a number of micro-holes 12031 are arrayed on the borosilicate glass carrier plate 1203, and the diameter of the micro-holes 12031 is between 0.02 mm and 0.1 mm.

[0037] Working principle: During the use of the present invention, the fluorosilicon coating 12023 of the upper polyurea film 12021 on the composite release film 1202 reduces the resin adhesion force through the low surface energy characteristic, and the edge acrylate coating 12024 ensures the fixation of the edge of the printing resin and the composite release film 1202 through the high adhesion force generated by the chemical anchoring effect, preventing the overall lifting. During the printing process, air penetrates upward through the micro-holes 12031 on the borosilicate glass carrier plate 1203 and the micro-holes 12025 on the composite release film, forming an air isolation layer with a thickness of 5-10 μm at the resin and release film interface, inhibiting excessive cross-linking at the interface, and reducing the peeling strength to less than 1.5 N / cm. The ultrasonic vibrator periodically conducts vibrations to the side surface of the borosilicate glass carrier plate, converting them into high-frequency vibrations to break the mechanical engagement between the model and the carrier plate. When the molding table 2 lifts the model upward, an air pressure difference is formed between the micro-holes on the plate and the micro-holes on the film, and the outside air is quickly supplemented to the peeling interface through the ventilation component 14 to balance the vacuum adsorption force, preventing the model from adhering to the release film due to negative pressure. Under the synergistic effect of the two, the demolding force of complex structure models is reduced by more than 60% compared with traditional platforms. The heat generated when the DLP light source 1302 works is initially absorbed by the fin-type radiator 1303. The vertical straight pipe fittings 1501 of the auxiliary heat dissipation component 15 guide the air flow to vertically pass through the radiator fins through the inverted L-shaped air flow channel 1502. The square protrusions 1504 of the air receiving box 1503 are embedded in the fin gaps, forming a high-speed air flow area of 2-3 m / s, and stably controlling the surface temperature of the lamp row at 55±5°C to avoid abnormal resin viscosity and model warping caused by high temperature.

[0038] The small air pump 1404 of the air flow circulation path inhales air from the outside through the dust-proof cover 1405, converges it to the air inlet pipe row 1401 through the straight exhaust-shaped pipe fitting 1403, and evenly inputs it into the curing area; the air after heat exchange enters the auxiliary heat dissipation component through the air delivery pipe row 1402, and discharges the heat of the radiator from the hole structure of the air receiving box, forming a closed-loop air flow system of "intake air filtration - area cooling - directional heat dissipation". The air change rate per minute reaches 5 - 8 m3, ensuring that the temperature gradient of the printing environment is ≤ 3 °C / mm; For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights involved.

[0039] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A 3D printing platform for complete demolding, comprising a workbench (1), a forming table (2) and a lifting module (3). The workbench (1) includes a table board (11), a printing module (12) and a curing mechanism (13), and further includes a bracket, a guard plate and a supporting leg arranged outside the workbench (1). The curing mechanism (13) includes a closed mounting frame (1301), a DLP light source (1302) and a radiator (1303), and is characterized in that: The printing module (12) includes a material tank (1201), a composite release film (1202), a borosilicate glass carrier plate (1203), and a vibration-assisted release assembly (1204) arranged in sequence from top to bottom. The bottom surface of the composite release film (1202) is adhesively connected to the upper surface of the borosilicate glass carrier plate (1203). The workbench (1) further includes a ventilation assembly (14) and an auxiliary heat dissipation assembly (15), and the ventilation assembly (14) and the auxiliary heat dissipation assembly (15) are respectively installed on both sides of the closed mounting frame (1301).

2. A 3D printing platform for complete demoulding according to claim 1, characterized in that: The platen (11) is a double-layer plate-like splicing structure with square holes (1103) penetrating through the middle. Among them, a thin film slot (1104) is provided on the upper splicing plate (1101) to support the composite release film (1202), and arc-shaped support plates (1105) are fixedly provided at the four corners of the square holes (1103) on the lower splicing plate (1102) to support the borosilicate glass carrier plate (1203). Cylindrical limiting grooves (1106) are horizontally arranged inside the double-layer plate-like splicing structure. The vibration-assisted release assembly (1204) is arranged inside the two cylindrical limiting grooves (1106), and a vertical cylindrical installation groove (1107) is further opened at one end of the cylindrical limiting groove (1106). The cylindrical installation groove (1107) is communicated with the cylindrical limiting groove (1106), and the other end of the cylindrical limiting groove (1106) is communicated with the square hole (1103).

3. The 3D printing platform for complete demoulding according to claim 2, characterized in that: The composite release film (1202) includes a polyurea polymer thin film (12021) on the upper layer and a colorless polyimide thin film (12022) on the lower layer. The polyurea polymer thin film (12021) and the colorless polyimide thin film (12022) are adhered and bonded after being laminated. A fluorosilicate coating (12023) containing silicon dioxide nanoparticles is coated on the central area of the upper surface of the polyurea polymer thin film (12021), and an acrylate coating (12024) is also coated on the edge area of the upper surface of the polyurea polymer thin film (12021). The area of the polyurea polymer thin film (12021) is larger than the area of the colorless polyimide thin film (12022).

4. A 3D printing platform for complete demoulding according to claim 3, characterized in that: The ventilation component (14) includes an intake pipe row (1401) and an air delivery pipe row (1402). The intake pipe row (1401) and the air delivery pipe row (1402) are respectively installed on both sides of the closed installation frame (1301) and penetrate through its side wall. A straight row-shaped pipe fitting (1403) is inserted outside the intake pipe row (1401) and fixed by screws. The straight row-shaped pipe fitting (1403) is used to converge the multiple pipes of the intake pipe row (1401) into the same pipe orifice. A small air pump (1404) is provided below the side of the intake pipe row (1401), and the output end of the small air pump (1404) is connected to the pipe orifice of the straight row-shaped pipe fitting (1403) through a pipe. A dust-proof cover (1405) is provided outside the input end of the small air pump (1404) and is connected through a pipe. The dust-proof cover (1405) penetrates through the outer protection plate of the workbench (1) and is fixed to the connecting part by screws.

5. The 3D printing platform with complete demoulding according to claim 4, characterized in that: The auxiliary heat dissipation component (15) includes a vertical straight row-shaped pipe fitting (1501). The vertical straight row-shaped pipe fitting (1501) is inserted outside the air delivery pipe row (1402) and fixed by screws. An air flow channel (1502) with an inverted L-shaped cross-section is provided inside the vertical straight row-shaped pipe fitting (1501). An air receiving box (1503) is provided at the bottom of the vertical straight row-shaped pipe fitting (1501). The air receiving box (1503) is a square hollow box body. The top of the air receiving box (1503) is connected to the air flow channel (1502) in a through manner. A number of square-shaped protrusions (1504) are provided on one side of the air receiving box (1503), and the middle part of the square-shaped protrusions (1504) is a hole structure and is connected to the internal space of the air receiving box (1503).

6. The 3D printing platform with complete demoulding according to claim 5, characterized in that: The radiator (1303) is a fin-type radiator. The square-shaped protrusions (1504) are clamped between adjacent fins of the radiator (1303), and the opening of the hole structure is vertically arranged with respect to the direction of the fins.

7. A 3D printing platform for complete demoulding according to claim 6, characterized in that: The vibration-assisted release component (1204) is an ultrasonic vibrator. The ultrasonic vibrator is composed of an ultrasonic transducer (12041) and an ultrasonic horn (12042). One end of the ultrasonic horn (12042) is connected to the side surface of the high borosilicate glass bearing plate (1203). The ultrasonic horn (12042) is embedded in the cylindrical limiting groove (1106) and is movably connected. The ultrasonic transducer (12041) is installed in the cylindrical installation groove (1107).

8. A 3D printing platform with complete demoulding according to claim 7, characterized in that: A number of micro-holes on the film (12025) are arrayed on the composite release film (1202). The diameter of the micro-holes on the film (12025) is between 10 and 15 nm.

9. A 3D printing platform with complete demoulding according to claim 8, characterized in that: A number of micro-holes on the plate (12031) are arrayed on the high borosilicate glass bearing plate (1203). The diameter of the micro-holes on the plate (12031) is between 0.02 mm and 0.1 mm.

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