Pulse stripping module, pulse stripping tray, 3D printing device and printing method

Abstract

The present application relates to a pulse peeling module, a pulse peeling tray, a 3D printing device and a printing method. The pulse peeling module includes a tray assembly, a support assembly and a pulsed gas supply assembly. The tray assembly has a release film. The support assembly is arranged below the tray assembly. The support assembly has a support member. The support member has a first preset distance from the release film in the height direction to form a gas chamber between the support member and the release film. An air inlet and an air outlet communicated with the gas chamber are respectively arranged on the support member. The pulsed gas supply assembly includes a gas oscillation assembly and a gas pipeline. The gas oscillation assembly is arranged on the gas pipeline, and the gas pipeline is connected to the air inlet. The pulse peeling module provided by the present application can quickly break the vacuum adsorption state between the release film and the support member, so that the peeling angle critical value can be reached between the printed part and the release film within a short peeling stroke, which is beneficial to reducing the peeling force and the peeling stroke.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and in particular to a pulse peeling module, a pulse peeling tray, a 3D printing device and a printing method. Background Art

[0002] In stereolithography 3D printing technology (such as DLP technology, LCD technology), a light source is used to irradiate a liquid photosensitive resin to cure and form it on a forming platform, so that the photosensitive material is cured layer by layer to form a three-dimensional object. When stereolithography 3D printing adopts a bottom-up forming method, each layer of the model is cured between the rigid surface of the tray and the forming platform. After curing, since the printed model adheres to the rigid surface of the tray, the two need to be peeled off before the next layer of the model can be printed. During the peeling process, there will be a large peeling force and a large noise. When printing with a specific material (such as an elastic material) or printing a specific model (such as a model with a cantilever), if the peeling force is large, there may be risks such as printing off the plate and printing warping, which may lead to printing failure and even damage to the printing device.

[0003] In order to reduce the peeling force when peeling the printed model, in the prior art, a flexible release film is used to replace the rigid surface of the tray. Since the release film has a certain ductility, the peeling between the cured printed model and the tray can be converted from surface separation to line separation, which can reduce the peeling force to a certain extent. When the forming platform drives the printed model to separate from the flexible release film, the angle between the flexible release film and the bottom surface of the printed model needs to reach the critical value θ of the peeling angle to achieve separation. As Figure 4 shown, due to the certain ductility of the flexible release film, under the pulling force of the printed model, it will undergo a certain degree of elastic deformation, which will lead to an increase in the peeling stroke and a decrease in the peeling efficiency. In addition, a rigid support is usually provided below the flexible release film to maintain a certain stiffness of the tray. When the forming platform drives the printed model to press down, the lower surface of the flexible release film will adsorb to the upper surface of the rigid support. When peeling, the flexible release film needs to be separated from the rigid support first, and then the flexible release film needs to be separated from the printed model. Since the rigid support has a large vacuum adsorption force on the flexible release film, it will also lead to an increase in the peeling force, making the effect of converting surface separation to line separation not obvious. Summary of the Invention

[0004] The present application provides a pulse peeling module, a pulse peeling tray, a 3D printing device and a printing method to solve the technical problems of large peeling force and long peeling stroke during the peeling of 3D printed models in the prior art.

[0005] In a first aspect, the present application provides a pulse peeling module, including:

[0006] The tray assembly, the tray assembly has a release film;

[0007] The support assembly, the support assembly is arranged below the tray assembly, the support assembly has a support member, and there is a first preset distance between the support member and the release film in the height direction to form a gas chamber between the support member and the release film; An air inlet and an air outlet communicating with the gas chamber are respectively arranged on the support member;

[0008] The pulsed gas supply assembly, the pulsed gas supply assembly includes a gas oscillation assembly and a gas pipeline, the gas oscillation assembly is arranged on the gas pipeline, and the gas pipeline is connected to the air inlet.

[0009] Optionally, a seal is arranged along the circumference of the support member, and the seal is used to connect with the tray assembly.

[0010] Optionally, a communication port communicating with the gas chamber is arranged on the seal.

[0011] Optionally, an auxiliary member is arranged on the side of the support member facing the release film, so that when the release film is attached to the support member and has a tendency to move away from the support member, a peeling cut angle is formed between the release film and the support member.

[0012] Optionally, the number of the auxiliary members is at least two, and they are dispersedly arranged along the circumference of the support member to form a gas chamber with a consistent height between the support member and the release film.

[0013] Optionally, the number of the auxiliary members is four, and they are respectively arranged corresponding to the four corners of the support member; and / or, the number of the auxiliary members is four, and they are respectively arranged corresponding to the four edges of the support member.

[0014] Optionally, the auxiliary member is any one or a combination of tape, plastic plate, metal gasket, foam, wooden thin plate, fiber cloth, etc.

[0015] Optionally, the pulsed gas supply assembly further includes a control valve to control the gas to enter the gas chamber according to preset requirements.

[0016] Optionally, the support member is a transparent rigid support member or a transparent flexible support member.

[0017] Optionally, when the support assembly is a transparent flexible support member, it further includes a rigid substrate arranged below the transparent flexible support member.

[0018] Optionally, the support member is one or a combination of fluoropolymer film, polydimethylsiloxane film, polymethylpentene film, acrylic glue, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluorinated ethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, thermosensitive resin, glass, screen, etc.

[0019] In a second aspect, the present application provides a pulse peeling tray. The pulse peeling tray has a release film and a support member. The support member and the release film have a second preset distance in the height direction to form a gas chamber between the support member and the release film. An air inlet and an air outlet are respectively provided on the support member and are communicated with the gas chamber.

[0020] The air inlet and the air outlet are used to connect with a pulse gas supply component.

[0021] Optionally, the support member is a transparent flexible support member.

[0022] Optionally, the transparent flexible support member is one or a combination of a fluoropolymer film, a polydimethylsiloxane film, a polymethylpentene film, an acrylic adhesive, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, a fluorinated ethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, a photosensitive resin, and a thermosensitive resin.

[0023] Optionally, the support assembly further includes a rigid substrate disposed below the transparent flexible support member.

[0024] Optionally, an auxiliary member is provided on the side of the support member facing the release film, so that when the release film is attached to the support member and has a tendency to move away from the support member, a peeling cut angle is formed between the release film and the support member.

[0025] Optionally, the number of the auxiliary members is at least two and they are dispersedly arranged along the circumferential direction of the support member to form a gas chamber with a consistent height between the support member and the release film.

[0026] Optionally, the number of the auxiliary members is four and they are respectively arranged corresponding to the four corners of the support member; and / or, the number of the auxiliary members is four and they are respectively arranged corresponding to the four edges of the support member.

[0027] Optionally, the auxiliary member is any one or a combination of a tape, a plastic plate, a metal gasket, a foam, a wooden thin plate, and a fiber cloth.

[0028] Optionally, a position sensor is provided on the tray body, and the position sensor is used to detect the position data of the release film.

[0029] In a third aspect, the present application provides a 3D printing device, including the pulse peeling module provided in the first aspect of the present application or the pulse peeling tray provided in the second aspect of the present application, and further including a forming platform, an optical machine, and a control system. The forming platform is disposed above the tray assembly, the optical machine is disposed below the support assembly, and the control system is respectively associated with the forming platform, the optical machine, and the pulse gas supply component.

[0030] Optionally, the control system communicates with the pulse gas supply component to generate a control instruction according to a pre-configured control strategy and send it to the pulse gas supply component.

[0031] Optionally, the control strategy is configured to: when it is detected that the release film of the 3D printing device is higher than a preset calibration position, the air pressure of the gas in the 3D printing device is higher than a preset air pressure range, the air flow of the gas in the 3D printing device is higher than a preset range, the concentration of the gas in the 3D printing device is higher than a preset concentration range, and the bearing force on the lower surface of the release film of the 3D printing device is greater than the bearing force on the upper surface, generate and send a first control instruction; wherein, the first control instruction includes controlling the reduction of the gas delivered by the pulsed gas supply component;

[0032] When it is detected that the release film of the 3D printing device is lower than a preset calibration position, the air pressure of the gas in the 3D printing device is lower than a preset air pressure range, the air flow of the gas in the 3D printing device is lower than a preset range, the concentration of the gas in the 3D printing device is lower than a preset concentration range, and the bearing force on the upper surface of the release film of the 3D printing device is less than the bearing force on the lower surface, generate and send a second control instruction; wherein, the second control instruction includes controlling the increase of the gas delivered by the pulsed gas supply component.

[0033] Optionally, the forming platform has an avoidance design for avoiding auxiliary parts.

[0034] Optionally, the avoidance design is at least one of an avoidance chamfer and an avoidance groove.

[0035] In a fourth aspect, the present application provides a 3D printing method, which uses the 3D printing device provided in the third aspect of the present application, and includes the following steps:

[0036] Obtain a set of sliced images corresponding to the three-dimensional model to be printed, and calculate the printing difficulty value corresponding to each layer of sliced images;

[0037] Based on the printing difficulty value, determine the printing parameters and pulsed air flow parameters corresponding to each layer of sliced images;

[0038] Based on the printing parameters, determine the model printing operation corresponding to each layer of sliced images, and based on the pulsed air flow parameters, determine the model peeling operation corresponding to each layer of sliced images.

[0039] Optionally, the pulsed air flow parameters include a pulse frequency, and there is a direct proportional relationship between the pulse frequency and the printing difficulty value.

[0040] Optionally, the model peeling operation includes: when peeling the model, introducing pulsed air flow into the air inlet at the pulse frequency, causing the volume of the gas chamber to change periodically, and causing the release film to oscillate periodically.

[0041] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0042] In the pulse stripping module provided by the embodiment of the present application, when the printed matter is stripped from the release film, the pulse gas supply component inputs a pulse air flow into the gas chamber through the air inlet, so that the volume of the gas chamber changes periodically, causing the release film to oscillate periodically, so that the release film shakes in a wavy shape during the stripping process, which can quickly break the vacuum adsorption state between the release film and the support, and at the same time, the bottom surface of the printed matter and the release film can reach the critical value of the stripping angle within a short stripping stroke, which is beneficial to reducing the stripping force and the stripping stroke, improving the printing efficiency and the printing success rate, and reducing the risk of plate dropping.

[0043] In the pulse stripping tray provided by the embodiment of the present application, the release film has a second preset distance from the support in the height direction to form a gas chamber, and an air inlet and an air outlet communicating with the gas chamber are respectively provided on the support. The pulse gas supply component inputs a pulse air flow into the gas chamber through the air inlet, so that the volume of the gas chamber changes periodically, causing the release film to oscillate periodically, so that when the printed matter is stripped from the release film, the release film shakes in a wavy shape during the stripping process, which can quickly break the vacuum adsorption state between the release film and the support, and at the same time, the bottom surface of the printed matter and the release film can reach the critical value of the stripping angle within a short stripping stroke, which is beneficial to reducing the stripping force and the stripping stroke, improving the printing efficiency and the printing success rate, and reducing the risk of plate dropping. Description of the Drawings

[0044] The drawings here are incorporated into the specification and constitute a part of this specification, showing the embodiments in line with the present application, and are used together with the specification to explain the principles of the present application.

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

[0046] One or more embodiments are illustrated by way of example with the pictures in the corresponding drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the drawings do not constitute a proportional limitation.

[0047] Figure 1 It is a schematic structural diagram of the pulse stripping module provided by the embodiment of the present application;

[0048] Figure 2 It is a schematic connection diagram of the tray assembly and the support assembly provided by the embodiment of the present application;

[0049] Figure 3Schematic diagram of the connection between the printed part and the pulse peeling module provided by the embodiment of the present application;

[0050] Figure 4 Schematic diagram of the peeling of the release film in the prior art;

[0051] Figure 5 Schematic diagram of the peeling of the pulse peeling module provided by the embodiment of the present application;

[0052] Figure 6 Top view of the pulse peeling tray provided by the embodiment of the present application;

[0053] Figure 7 For the embodiment of the present application along Figure 6 Cross-sectional view taken along A-A in;

[0054] Figure 8 Cross-sectional view of the pulse peeling tray provided by the embodiment of the present application;

[0055] Figure 9 Partial structural schematic diagram of the support component, pulse peeling tray and forming platform provided by the embodiment of the present application;

[0056] Figure 10 Top view of the support component, pulse peeling tray and forming platform provided by the embodiment of the present application;

[0057] Figure 11 Partial structural diagram of the support component, pulse peeling tray and forming platform provided by the embodiment of the present application;

[0058] Figure 12 Partial structural diagram of the support component, pulse peeling tray and forming platform provided by the embodiment of the present application;

[0059] Figure 13 Partial structural schematic diagram of the support component, pulse peeling tray and forming platform provided by the embodiment of the present application;

[0060] Figure 14 Top view of the support component, pulse peeling tray and forming platform provided by the embodiment of the present application;

[0061] Figure 15 Partial structural diagram of the support component, pulse peeling tray and forming platform provided by the embodiment of the present application.

[0062] Figure 16 Structural schematic diagram of the 3D printing device provided by the embodiment of the present application;

[0063] Figure 17 Control schematic diagram of the 3D printing device provided by the embodiment of the present application;

[0064] Figure 18 Flow chart of the 3D printing method provided by the embodiment of the present application.

[0065] It should be noted that in Figure 2 、 Figure 3 and Figure 16 the dashed line represents the initial position of the release film; Figure 16 the dotted line in

[0066] represents the irradiation range of the optical machine.

[0067] 1. Tray assembly; 11. Release film; 12. Tray body; 13. Position sensor

[0068] 2. Support assembly; 21. Support member; 21a. Transparent rigid support member; 21b. Transparent flexible support member; 211. Air inlet; 212. Air outlet; 22. Seal; 22a. First seal; 22b. Second seal; 221. Circulation port; 23. Rigid substrate; 24. Connecting member

[0069] 3. Pulse gas supply assembly; 31. Gas oscillation assembly; 32. Gas pipeline; 33. Gas source; 34. Control valve

[0070] 4. Forming platform; 5. Optical machine; 6. Control system; 7. Printed part

[0071] 81. Base; 82. Forming surface; 83. Avoidance design; 84. Auxiliary part Detailed implementation manners

[0072] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0073] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0074] For ease of description, spatial relative relationship terms may be used in the text to describe the relative position relationship or movement of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms are, for example, "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", "front", "rear", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation other than the orientations depicted in the figure. For example, if the device in the figure undergoes a position flip, attitude change, or motion state change, then these directional indications will change accordingly. For example, an element described as "below other elements or features" or "beneath other elements or features" will subsequently be oriented as "above other elements or features" or "over other elements or features". Therefore, the exemplary term "below" can include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0075] Please refer to Figure 16 , this application provides a 3D printing device. In one embodiment, the 3D printing device may include a forming platform 4, a material tray assembly 1, a support assembly 2, etc.

[0076] Among them, the material tray assembly 1 can be used to hold printing materials, and the forming platform 4 can be arranged on one side of the material tray assembly 1 where the printing materials are held. In this embodiment, the forming platform 4 may have a forming surface 82. During the printing process, the printed part can be solidified layer by layer on the forming surface 82 to form the required printed part from the printing materials.

[0077] It should be noted that the 3D printing technology applicable in this application may include light-curing 3D printing such as DLP, LCD, Micro-LED, Mini-LED, etc., as well as other surface exposure 3D printing technologies, which are not limited herein.

[0078] When using a film tensioning tray in a 3D printing device, during the printing and forming process, as the forming platform presses down to facilitate the contact between the bottom of the printed part and the liquid photosensitive material, a drainage force will be generated on the upper surface of the flexible release film. The rigid support below the flexible release film will generate an electrostatic force on the lower surface of the flexible release film. Under the dual action of the drainage force and the electrostatic force, the flexible release film will undergo elastic deformation and move downward to approach and fit with the rigid support, forming a vacuum adsorption state. After the bottom layer of the printed model is cured, the flexible release film needs to be peeled off from the surface of the rigid support first. The surface peeling process will increase the peeling force and the fit may fail during the peeling process, resulting in a sudden change in the peeling force value, causing printing failure or abnormal release surface of this layer; after the surface peeling between the flexible release film and the rigid support is completed, the forming platform drives the printed part to rise further. The bottom surface of the printed part and the flexible release film need to reach the critical peeling angle value θ to achieve line peeling. Due to the certain ductility of the flexible release film, the peeling stroke will be relatively long, as Figure 4 shown.

[0079] To solve the technical problems of large peeling force and long peeling stroke during the peeling of 3D printing models in the prior art, the present application provides a pulse peeling module, a 3D printing device and a printing method, which can form a gas chamber through the release film 11 and the support 21, and fill the gas chamber with pulsed air flow through the gas oscillation component 31 of the pulsed gas supply component, realize the volume change of the gas cavity, make the release film 11 oscillate periodically, quickly break the vacuum adsorption state between the release film 11 and the support 21, avoid the influence of the surface peeling between the release film 11 and the support 21 on the peeling force size, and can significantly reduce the peeling force; the release film 11 can reach the critical peeling angle value faster during the oscillation process, reduce the peeling stroke, thereby improving the printing efficiency and printing success rate, and reducing the risk of plate dropping.

[0080] Please refer to Figures 1 to 18 , the embodiment of the present application provides a pulse peeling module, including a tray component 1, a support component 2 and a pulsed gas supply component 3. The tray component 1 has a release film 11, which can be used in combination with the tray body 12 to form a trough for containing liquid photosensitive material (such as photosensitive resin); the support component 2 is connected below the tray component 1. The support component 2 has a support 21, which can be used to support the release film 11 during the pressing process of the forming platform 4. The support 21 and the release film 11 have a first preset distance in the height direction to form a gas chamber between the support 21 and the release film 11. The first preset distance is the thickness of the gas chamber to prevent the lower surface of the release film 11 from fitting with the upper surface of the support 21 in the initial state, as Figure 1As shown; the support member 21 is respectively provided with an air inlet 211 and an air outlet 212 which are connected to the gas chamber, so as to facilitate the air flow in and out of the gas chamber; the pulse gas supply component 3 includes a gas oscillation component 31 and a gas pipeline 32, and the gas oscillation component 31 is arranged on the gas pipeline 32, and is used to change the air flow in the gas pipeline 32 into a pulse air flow. When the printed part 7 is peeled off from the release film 11, the pulse gas supply component 3 inputs a pulse air flow into the gas chamber through the air inlet 211, which can cause the volume of the gas chamber to change periodically, and cause the release film 11 to oscillate periodically, so that the release film 11 shakes in a wave-like manner during the peeling process, which can quickly break the vacuum adsorption state between the release film 11 and the support member 21, and at the same time, it can also make the bottom surface of the printed part 7 and the release film 11 reach the critical value of the peeling angle θ within a shorter peeling stroke, as shown in FIG. Figure 5 As shown, it is helpful to reduce the peeling force and peeling stroke, improve printing efficiency and printing success rate, and reduce the risk of plate falling off.

[0081] It should be noted that the release film 11 can be connected to the material tray body 12 by using a film stretching mechanism in the prior art, so that the release film 11 is in a horizontal state in the initial state, which is convenient for controlling the thickness of each layer of the printed part 7 and avoiding uneven layer thickness. Because the release film 11 is an elastic structure, the air pressure change of the air inlet 211 will cause a slight change in the volume of the internal space of the air cavity, such as Figure 2 As shown, the magnitude of the change is represented by the magnitude of the change in air pressure at the air outlet 212 .

[0082] It should be noted that the first preset distance can be set as needed. In some embodiments of the present application, the first preset distance is 0.01 mm - 10 mm, such as 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, or a value between any two point values. This is because during exposure curing, the support member 21 needs to fit and support the bottom of the release film 11 to provide a stable forming surface for forming; if the thickness of the gas chamber is too large, when printing a model with a small cross-section, it is difficult for the bottom of the printed part 7 to provide sufficient drainage force to the release film 11 to make it fit on the support member 21, which will cause the forming surface to be unstable, resulting in uneven printing thickness between different layers of the printed part 7 when the cross-section changes between layers. In the present application, when the release film 11 oscillates due to pulsed air flow, during the peeling process after exposure curing, the vacuum adsorption effect formed by the fit between the release film 11 and the underlying support member 21 can be quickly broken through by the oscillation, so that the entire gas chamber quickly returns to the initial gas chamber state. The peeling force after breaking the vacuum is the same as that of the gas chamber state without fitting, and there is no need to increase the thickness of the gas chamber to achieve this effect. When the first preset distance is 0.01 mm - 10 mm, the thickness of the gas chamber is relatively thin, which is convenient for the support member 21 to fit and support the bottom of the release film 11 during forming, providing a stable forming surface for forming, improving the forming accuracy of each layer of curing and the consistency of the cured area forming, and at the same time reducing the risk of abnormal zero finding in the first layer of photocuring printing.

[0083] It should be noted that the gas oscillation assembly 31 can adopt a gas oscillator in the prior art. The pulsed gas supply assembly 3 further includes a gas source 33 connected to the gas oscillation assembly 31 for providing initial air flow. The gas source 33 can adopt nitrogen, oxygen, air, inert gas, etc. A pressure detection member and a valve member can be provided on the gas pipeline 32 to facilitate the detection of the pulsed air flow in the gas pipeline 32.

[0084] In some embodiments, the pulsed gas supply assembly 3 includes a control valve 34 to control the gas to enter the gas chamber according to preset requirements. Specifically, continuous gas supply can be controlled according to the requirements of the printed part 7, or intermittent gas supply can be used, or continuous gas supply for a period and intermittent gas supply for a period can be used, which is not limited here. Those skilled in the art can set according to experimental requirements, process strategies, etc.

[0085] In order to enable the air flow to enter and exit the gas chamber only from the air inlet 211 and the air outlet 212, in some embodiments of the present application, a seal 22 is provided along the circumference of the support member 21. The seal 22 is used to connect to the tray assembly 1 to seal between the support member and the tray assembly. Specifically, the seal 22 can be connected between the tray body 12 and the support member 21, such as Figure 2as shown by the first seal 22a in; the seal 22 can also be directly connected between the release film 11 and the support 21, as Figure 7 shown by the second seal 22b in. The seal 22 is also an auxiliary member 84, disposed between the release film 11 and the support 21, as Figure 8 shown by the auxiliary member 84 in.

[0086] When the seal 22 is directly connected between the release film 11 and the support 21, if the air inlet 211 and the air outlet 212 are outside the periphery of the seal 22, it will cause the pulsed air flow to be unable to enter the gas chamber formed by the release film 11, the seal 22 and the support 21. Therefore, in some embodiments of the present application, the seal 22 is provided with a communication port 221 communicating with the gas chamber, as Figure 6 shown.

[0087] It should be noted that the air outlet 212 can be provided on the support 21 or in the non-sealed area of the seal 22.

[0088] Since the support 21 needs to provide a stable forming surface for the release film 11 when it fits with the release film 11, in some embodiments of the present application, the support 21 is a transparent rigid support 21a, as Figures 1 to 3 shown. When the forming platform 4 and the printed part 7 are pressed down on the release film 11, the upper surface of the transparent rigid support 21a fits with the bottom of the release film 11, and the support provides a supporting function, which can provide a stable forming surface for exposure curing.

[0089] In some embodiments, as Figures 7 - 15 shown, in order to ensure that the supporting surface of the support 21 facing the release film 11 is lower than the release film 11 to better ensure the controllability of the height (thickness) of the gas chamber, the support assembly 2 can include the support 21 and the auxiliary member 84. Among them, the support 21 can be disposed on one side of the tray assembly 1, specifically on the side of the tray assembly 1 away from the forming platform 4. The auxiliary member 84 can be disposed on the side of the support 21 facing the release film 11, so that when the release film 11 fits with the support 21 and has a tendency to move away from the support 21, there is a peeling cut angle between the release film 11 and the support 21. In addition, the support 21 can also prevent the release film 11 from collapsing, so that the gas chamber better meets the preset height.

[0090] The tray assembly 1 in this embodiment can be a tray assembly 1 with a film tensioning structure. Specifically, the tray assembly 1 can further include a tray main body 12 connected to the outer periphery of the release film 11, and the release film 11 is connected to the tray main body 12 in a tensioned state, so that one end of the tray main body 12 is in a closed state, and thus the tray assembly 1 can be used to hold printing materials.

[0091] Further, the support member 21 can be used to support the release film 11 of the tray assembly 1 during the 3D printing process, thereby providing a flat support surface for the printing material located between the release film 11 and the forming surface 82 of the forming platform 4 during the 3D printing process, so as to improve the flatness of the cured layer. Specifically, the support member 21 can be made of a light-transmitting material or a material that is at least partially light-transmitting, so as to allow light to pass through the support member 21 and cure the printing material in the tray assembly 1 after passing through the release film 11.

[0092] The auxiliary member 84 can further assist in supporting the release film 11, so that a certain interval, that is, a gas chamber, can be formed between the release film 11 and the support member 21. Specifically, the number of the auxiliary members 84 can be one or more. When the number of the auxiliary members 84 is multiple, they can be arranged at intervals on one side of the support member 21. Further, the auxiliary member 84 can be arranged at the peripheral part of the support member 21. Of course, in some embodiments, it can also be arranged at the middle part of the support member 21; or part of it is arranged at the peripheral part and part of it is arranged at the middle part; it can be specifically set according to actual needs and will not be specifically limited here.

[0093] It should be noted that during the 3D printing process, the forming process of each cured layer may include the forming platform 4 pressing down to drain liquid, the light source exposing to cure the printing material, and the forming platform 4 rising to peel the cured layer from the release film 11. After the forming platform 4 presses down, the release film 11 is easily attached to the support surface on the side of the support member 21 facing the release film 11 and forms a vacuum adsorption and is difficult to separate. In this way, when the forming platform 4 rises to peel the printed part from the release film 11, the release film 11 has a large pulling force on the printed part, which is likely to cause consequences such as printing failure or poor surface quality of the printed part.

[0094] In this embodiment, by further providing the auxiliary member 84 on the support member 21, a gas chamber is formed between the release film 11 and the support member 21. Even when the forming platform 4 presses down to form a vacuum adsorption between the release film 11 and the support member 21 and form a fit, since the auxiliary member 84 also forms a gas chamber between the support member 21 and the release film 11, therefore, when the forming platform 4 rises to peel the printed part 7 from the release film 11, it drives the release film 11 to move away from the support member 21. At this time, because of the existence of the gas chamber, a situation like Figure 12The peeling chamfer α shown. It should be noted that the existence of the peeling chamfer α can reduce the difficulty of breaking the vacuum environment between the release film 11 and the support member 21 when the release film 11 is pulled, that is, the release film 11 and the support member 21 are easily separated, thereby greatly reducing the peeling force between the release film 11 and the printed part 7 during the rising and peeling process of the forming platform 4, facilitating the peeling of the printed part 7 from the release film 11, thus improving the printing success rate and printing efficiency, reducing the risk of the printed part 7 falling from the forming platform 4 during the rising and peeling process of the forming platform 4, and improving the quality of the printed part 7.

[0095] In one embodiment, the number of the auxiliary members 84 is at least two and they are dispersedly arranged along the circumferential direction of the release film 11. Specifically, the number of the auxiliary members 84 can be two, three, five, ten, etc., and they can be evenly dispersedly arranged around the gas chamber or randomly dispersedly arranged.

[0096] In one embodiment, the auxiliary member 84 can be arranged to form a gas chamber with a consistent height between the support member 21 and the release film 11. It should be noted that this refers to the situation when the forming platform 4 does not press down on the release film 11.

[0097] Furthermore, the height of the gas chamber can be 0.2 - 0.3 mm, specifically such as 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, etc. The control of this height can effectively reduce the peeling force between the printed part and the release film 11.

[0098] In one application scenario, by supplying gas into the above gas chamber, it can assist in breaking the vacuum adsorption between the release film 11 and the support member 21 during the rising process of the forming platform 4, so that the release film 11 and the support member 21 are more easily separated.

[0099] It should be noted that the consistent height here can refer to being consistent within a certain error range, rather than being strictly consistent. Of course, in another embodiment, a gas chamber with an inconsistent height can also be formed between the support member 21 and the release film 11, as long as the above-mentioned easy peeling requirement can be met, and it is not limited here.

[0100] In one embodiment, the number of the auxiliary members 84 can be four and they are respectively arranged corresponding to the four corners of the support member 21, specifically as Figures 8 - 11 shown.

[0101] In one embodiment, the number of the auxiliary members 84 can be four and they are respectively arranged corresponding to the four edges of the support member 21, specifically as Figures 13 - 15 shown. Among them, the auxiliary members 84 can be respectively located at the central position or other positions of the corresponding edges.

[0102] In one embodiment, the auxiliary member 84 can be arranged according to the shape of the support member 21, etc., and can be, for example, circular, polygonal, irregular in shape, etc. In an application scenario, the shape can be circular. At this time, the auxiliary member 84 can be arranged circumferentially around the support member 21. In another application scenario, the shape can be polygonal. At this time, the auxiliary member 84 can be arranged corresponding to the corners of the polygon, or can also be arranged corresponding to the edges of the polygon. No specific limitation is made here.

[0103] In one embodiment, the auxiliary member 84 can be any one or a combination of a tape, a plastic plate, a metal gasket, a foam, a thin wood board, a fiber cloth, etc., or can also be other types of suitable materials.

[0104] In one embodiment, the auxiliary member 84 is selected as a tape to be adhered to the support member 21. The thickness of the tape is 0.1 - 0.3 mm, specifically such as 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc. Of course, in some application scenarios, the tape can also be adhered to the release film 11.

[0105] Furthermore, the tape can be composed of a base material and an adhesive backing, and can be a single-sided tape, a double-sided tape, or can also be without an adhesive backing. The material of the base material of the tape can be a cast polypropylene film (CPP), an oriented polypropylene film (OPP), a biaxially oriented polypropylene film (BOPP), polyethylene (PE), a uniaxially oriented polypropylene film (MOPP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), Teflon, Teflon fiberglass cloth, acetate cloth, cloth base, foam, metal foil, masking paper, etc. The material of the adhesive backing can be a water-based adhesive, an oil-based adhesive, a hot melt adhesive, natural rubber, synthetic rubber, etc. No specific limitation is made here.

[0106] In some embodiments, the pulsed gas supply assembly 3 further includes a control valve to control the intermittent entry of gas into the gas chamber. By providing the control valve, it is convenient to control the entry of gas into the gas chamber and intermittently supply gas according to requirements, such as oscillating gas. Of course, gas can also be continuously supplied, or gas can be continuously supplied for a period of time and intermittently supplied for a period of time according to needs. No limitation is made here, and those skilled in the art can set it according to process strategies, etc.

[0107] In some embodiments, the support member is a transparent rigid support member 21a or a transparent flexible support member 21b. When the support member 21 is a transparent flexible support member 21b, a gas chamber is formed between the release film 11 and the transparent flexible support member 21b. The auxiliary member can be arranged on the flexible support member 21b to abut against the release film, and better maintain the gas chamber to meet the preset height (thickness), such as Figure 8As shown. The auxiliary member 84 can be disposed on the side of the support member 21 facing the release film 11, so that when the release film 11 is attached to the support member 21 and has a tendency to move away from the support member 21, a peeling cut angle is formed between the release film 11 and the support member 21.

[0108] In some embodiments, the support assembly 2 further includes a rigid substrate 23 disposed below the transparent flexible support member 21b to provide a support function, ensure the consistency during the printing of the release film 11, and provide a stable forming surface, such as Figure 7 shown. The rigid substrate can be a glass support plate, a plastic support plate, etc., or can be a display screen, such as an LCD screen, a Micro-LED screen, a Mini-LED screen, an OLED screen, etc., which is not specifically limited here.

[0109] In some embodiments, the support member 21 and the rigid substrate 23 have a third preset distance in the height direction. In the initial state, the release film 11, the transparent flexible support member 21b, and the transparent rigid substrate 23 are all in a separated state. When the forming platform 4 and the printed part 7 are pressed down on the release film 11, the bottom surface of the release film 11 fits with the upper surface of the transparent flexible support member 21b, and the bottom surface of the transparent flexible support member 21b fits with the upper surface of the rigid substrate 23, and a stable forming surface can be provided for exposure curing through the transparent rigid substrate 23; during peeling, pulsed air enters between the release film 11 and the transparent flexible support member 21b, and both the release film 11 and the transparent flexible support member 21b will undergo high-frequency oscillations, and the oscillation directions are opposite, which can exacerbate the volume change of the gas chamber and at the same time reduce the intake pressure magnitude, reduce the influence of the excessive oscillation amplitude of the release film 11 on the forming quality of the peeling surface of the solid polymer (i.e., the printed part 7), and can quickly break the vacuum adsorption effect formed by the fitting of the release film 11 and the lower transparent flexible support member 21b. The transparent flexible support member 21b and the transparent rigid substrate 23 will also be separated due to the oscillation, which will not affect the peeling of the printed part 7.

[0110] It should be noted that the third preset distance is smaller than the first preset distance to avoid excessive spacing between the release film 11 and the rigid substrate 23 from affecting the forming accuracy. In order to have a third preset distance between the transparent flexible support member 21b and the rigid substrate 23, a connecting member 24 with a thickness is provided along the circumference of the transparent rigid substrate 23, such as Figure 7 shown.

[0111] Since the release film 11 and the transparent flexible support 21b need to withstand repeated pressing and peeling, in some embodiments of the present application, the release film 11 and the transparent flexible support 21b are fluoropolymer films. Since fluoropolymer films have good mechanical strength and can withstand the repeated pressing and peeling of the forming platform 4, in addition, fluoropolymer films also have the advantages of good chemical stability and good thermal stability, and are suitable for 3D printing. In some embodiments, the fluoropolymer film includes the following types: FEP (fluorinated ethylene propylene copolymer) film, PTFE (polytetrafluoroethylene) film, nFEP film (a film made by combining FEP resin and PTFE resin copolymer), PFA (perfluorinated ethylene copolymer tetrafluoroethylene) film, PVDF (polyvinylidene fluoride) film, PVF (polyvinyl fluoride film) film, ETFE (ethylene-tetrafluoroethylene copolymer) film, and so on.

[0112] In some embodiments, the transparent flexible support 21b can also be a polydimethylsiloxane (PDMS) film or a polymethylpentene (PMP) film. Both have the advantage of high transparency and will not affect the exposure curing of the printed part 7. Among them, the PDMS film has high elasticity and resilience, and also has excellent weather and temperature resistance (-60 to 200 °C); the PMP film has a very low surface tension, only 24 mN / m, which is even lower than some fluororesins. Compared with other materials, it has excellent peelability and is easy to realize the peeling of the release film 11 and the transparent flexible support 21b.

[0113] In one embodiment, the support 21 can be rigid, such as a rigid support plate. Specifically, such as a glass support plate, a plastic support plate, etc., or it can also be a display screen, such as an LCD screen, a Micro-LED screen, a Mini-LED screen, an OLED screen, etc., which is not specifically limited here.

[0114] In some embodiments, the support 21 is one or a combination of several of a fluoropolymer film, a polydimethylsiloxane film, a polymethylpentene film, acrylic glue, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluorinated ethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, thermosensitive resin, glass, and a screen.

[0115] In the above embodiments, the pulsing release module (PRM) provided by the present application can fill the gas chamber at the bottom of the tray with pulsed airflows to form pulsed release when peeling the printed part 7. When the bottom layer of the printed part 7 is peeled from the release film 11, under the action of the pulsed airflows, the release film 11 undergoes high-frequency jitter, which can quickly break the vacuum adsorption state between the release film 11 and the support member 21, eliminate the vacuum adsorption force, reduce the peeling force during release, and at the same time avoid the sudden change of the peeling force when the release film 11 is separated from the support member 21; after the release film 11 is separated from the support member 21, the release film 11 continuously generates physical oscillatory motion under the action of the pulsed airflows, providing line peeling from the edge to the center during the release process to achieve the side peeling effect, which can significantly reduce the peeling force value, improve the release success rate of this layer of the printed part 7, improve the printing efficiency and printing success rate, and reduce the risk of plate dropping.

[0116] Please refer to Figures 1 to 18 , the second aspect of the embodiment of the present application provides a pulsing release tray, which has a release film 11 and a support member 21. The support member 21 and the release film 11 have a second preset distance in the height direction to form a gas chamber between the support member 21 and the release film 11; the support member 21 is respectively provided with an air inlet 211 and an air outlet 212 communicating with the gas chamber; the air inlet 211 and the air outlet 212 are used to connect with the pulsed gas supply assembly 3. The pulsed gas supply assembly 3 inputs pulsed airflows into the gas chamber through the air inlet 211 to cause the volume of the gas chamber to change periodically, so that the release film 11 generates periodic oscillations, so that when the printed part 7 is peeled from the release film 11, the release film 11 jitters in a wavy shape during the peeling process, which can quickly break the vacuum adsorption state between the release film 11 and the support member 21, and at the same time can also make the bottom surface of the printed part 7 and the release film 11 reach the critical value of the peeling angle within a short peeling stroke, which is beneficial to reducing the peeling force and the peeling stroke, improving the printing efficiency and printing success rate, and reducing the risk of plate dropping.

[0117] In some embodiments, the pulsing release tray can be the tray assembly in the first aspect of the embodiment of the present application, and the second preset distance can be equal to the first preset distance.

[0118] In some embodiments, the support assembly 2 can include a support member 21 and an auxiliary member 84. Among them, the support member 21 can be arranged on one side of the tray assembly 1, specifically on the side of the tray assembly 1 away from the forming platform 4. The auxiliary member 84 can be arranged on the side of the support member 21 facing the release film 11, so that when the release film 11 is attached to the support member 21 and has a tendency to move away from the support member 21, there is a peeling cut angle between the release film 11 and the support member 21.

[0119] The tray assembly 1 in this embodiment can be a tray assembly with a film tensioning structure. Specifically, the tray assembly 1 may further include a tray body 12 connected to the outer periphery of the release film 11. The release film 11 is connected to the tray body 12 in a tensioned state, so that one end of the tray body 12 is in a closed state. Thus, the tray assembly 1 can be used to hold printing materials.

[0120] Furthermore, the support member 21 can be used to support the release film 11 of the tray assembly 1 during the 3D printing process, and further provide a flat support surface for the printing material located between the release film 11 and the forming surface 82 of the forming platform 4 during the 3D printing process, thereby improving the flatness of the cured layer. Specifically, the support member 21 can be made of a light-transmitting material or at least partially light-transmitting material to allow light to pass through the support member 21 and cure the printing material in the tray assembly 1 after passing through the release film 11.

[0121] The auxiliary member 84 can further assist in supporting the release film 11, so that a certain interval, that is, a gas chamber, can be formed between the release film 11 and the support member 21. Specifically, the number of the auxiliary members 84 can be one or more. When the number of the auxiliary members 84 is multiple, they can be arranged at intervals on one side of the support member 21. Further, the auxiliary member 84 can be arranged at the peripheral part of the support member 21. Of course, in some embodiments, it can also be arranged at the middle part of the support member 21; or part of it is arranged at the peripheral part and part of it is arranged at the middle part; it can be specifically set according to actual needs and is not specifically limited here.

[0122] It should be noted that during the 3D printing process, the forming process of each cured layer may include the forming platform 4 pressing down to drain liquid, the light source exposing to cure the printing material, and the forming platform 4 rising to peel the cured layer from the release film 11. After the forming platform 4 presses down, the release film 11 is easily attached to the support surface on the side of the support member 21 facing the release film 11 and forms a vacuum adsorption and is difficult to separate. In this way, when the forming platform 4 rises to peel the printed part from the release film 11, the release film 11 has a large pulling force on the printed part, which is likely to cause consequences such as printing failure or poor surface quality of the printed part.

[0123] In this embodiment, by further arranging the auxiliary member 84 on the support member 21, a gas chamber is formed between the release film 11 and the support member 21. Even if the forming platform 4 presses down to form a vacuum adsorption and adhesion between the release film 11 and the support member 21, since the auxiliary member 84 also forms a gas chamber between the support member 21 and the release film 11, therefore, when the forming platform 4 rises to peel the printed part 7 from the release film 11, it drives the release film 11 to move away from the support member 21. At this time, because of the existence of the gas chamber between the release film 11 and the support member 21, it forms as Figure 12The peeling chamfer α shown. It should be noted that the existence of this peeling chamfer α can reduce the difficulty of breaking the vacuum environment between the release film 11 and the support 21 when the release film 11 is pulled, that is, it makes the release film 11 and the support 21 easy to separate, and then greatly reduces the peeling force between the release film 11 and the printed part 7 during the rising and peeling process of the forming platform 4, facilitating the peeling of the printed part 7 from the release film 11, thereby improving the printing success rate and printing efficiency, reducing the risk of the printed part 7 falling from the forming platform 4 during the rising and peeling process of the forming platform 4, and improving the quality of the printed part 7.

[0124] In one embodiment, the number of the auxiliary members 84 is at least two and is dispersedly arranged along the circumferential direction of the release film 11. Specifically, the number of the auxiliary members 84 can be two, three, five, ten, etc., and can be evenly dispersedly arranged in fixed gas chambers, or can be randomly dispersedly arranged.

[0125] In one embodiment, the auxiliary member 84 can be arranged to form a gas chamber with a consistent height between the support 21 and the release film 11. It should be noted that this refers to the situation when the forming platform 4 does not press down on the release film 11.

[0126] Furthermore, the height of this gas chamber can be 0.2 - 0.3 mm, specifically such as 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, etc. The control of this height can effectively reduce the peeling force between the printed part and the release film 11.

[0127] In this way, ventilation design can be further carried out to supply gas between the release film 11 and the support 21 according to actual needs, such as at least one of oxygen, nitrogen, inert gas, etc.

[0128] In one application scenario, by supplying gas to the above gas chamber, it can assist in breaking the vacuum adsorption between the release film 11 and the support 21 during the rising process of the forming platform 4, so that the release film 11 and the support 21 are more easily separated.

[0129] It should be noted that the consistent height here can refer to being consistent within a certain error range, rather than being strictly consistent. Of course, in another embodiment, a gas chamber with an inconsistent height can also be formed between the support 21 and the release film 11, as long as the above requirements for easy peeling can be met, and it is not limited here.

[0130] In one embodiment, the number of the auxiliary members 84 can be four and are respectively arranged corresponding to the four corners of the support 21, specifically as Figures 7 - 11 shown.

[0131] In one embodiment, the number of auxiliary members 84 may be four, which are respectively arranged corresponding to the four edges of the support member 21, specifically as Figures 13 - 15 shown. Among them, the auxiliary members 84 may be respectively located at the central positions of the corresponding edges, or other positions.

[0132] In one embodiment, the setting manner of the auxiliary members 84 may be set according to the shape of the support member 21, etc., for example, it may be circular, polygonal, irregular in shape, etc. In an application scenario, the shape may be circular. At this time, the auxiliary members 84 may be arranged circumferentially around the support member 21. In another application scenario, the shape may be polygonal. At this time, the auxiliary members 84 may be arranged corresponding to the corners of the polygon, or may also be arranged corresponding to the edges of the polygon, and no specific limitation is made here.

[0133] In one embodiment, the auxiliary member 84 may be any one or a combination of tape, plastic sheet, metal gasket, foam, wooden thin board, fiber cloth, etc., or may also be other types of suitable materials.

[0134] In one embodiment, the auxiliary member 84 is selected as tape for bonding to the support member 21. The thickness of the tape is 0.1 - 0.3 mm, specifically such as 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc. Of course, in some application scenarios, the tape may also be bonded to the release film 11.

[0135] Furthermore, the tape may be composed of a base material and an adhesive backing, and may be a single-sided tape, a double-sided tape, or may not have an adhesive backing. The material of the base material of the tape may be cast polypropylene film (CPP), oriented polypropylene film (OPP), biaxially oriented polypropylene film (BOPP), polyethylene (PE), uniaxially oriented polypropylene film (MOPP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), Teflon, Teflon fiberglass cloth, acetate cloth, cloth base, foam, metal foil, masking paper, etc. The material of the adhesive backing may be water-based adhesive, oil-based adhesive, hot melt adhesive, natural rubber, synthetic rubber, etc., and no specific limitation is made here.

[0136] In some embodiments, the support assembly 2 further includes a rigid substrate 23 disposed below the transparent flexible support member 21b. The rigid substrate may be a glass support plate, a plastic support plate, etc., or may also be a display screen, such as an LCD screen, a Micro-LED screen, a Mini-LED screen, an OLED screen, or other rigid members, and no specific limitation is made here. To provide a supporting effect, ensure the consistency during the printing of the release film (11), and provide a stable forming surface.

[0137] In some embodiments, the transparent flexible support 21b is a fluoropolymer film, a polydimethylsiloxane film, or a polymethylpentene film. In some embodiments, the fluoropolymer film includes the following types: FEP (fluorinated ethylene propylene copolymer) film, PTFE (polytetrafluoroethylene) film, nFEP film (a film made by copolymerizing FEP resin and PTFE resin), PFA (perfluoroalkoxy copolymerized tetrafluoroethylene) film, PVDF (polyvinylidene fluoride) film, PVF (polyvinyl fluoride) film, ETFE (ethylene-tetrafluoroethylene copolymer) film, and so on.

[0138] In some embodiments, the transparent flexible support 21b can also be a polydimethylsiloxane (PDMS) film or a polymethylpentene (PMP) film. Both have the advantage of high transparency and will not affect the exposure curing of the printed part 7. Among them, the PDMS film has high elasticity and resilience, and also has excellent weather and temperature resistance (-60 to 200 °C); the PMP film has a very low surface tension of only 24 mN / m, which is even lower than some fluororesins. Compared with other materials, it has excellent peelability and is easy to realize the peeling of the release film 11 from the transparent flexible support 21b.

[0139] In some embodiments, the transparent flexible support 21b is one or a combination of several of a fluoropolymer film, a polydimethylsiloxane film, a polymethylpentene film, acrylic glue, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluorinated ethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, and thermosensitive resin.

[0140] In the above embodiments, the pulsed gas supply component 3 of the pulsed release resin tank (PRRT) provided by the present application inputs pulsed air flow into the gas chamber through the air inlet 211, so as to cause a periodic change in the volume of the gas chamber, making the release film 11 oscillate periodically. As a result, when the printed part 7 is peeled off from the release film 11, the release film 11 shakes in a wavy shape during the peeling process, which can quickly break the vacuum adsorption state between the release film 11 and the support 21. At the same time, it can also make the bottom surface of the printed part 7 and the release film 11 reach the critical value of the peeling angle within a short peeling stroke, which is beneficial to reducing the peeling force and peeling stroke, improving the printing efficiency and printing success rate, and reducing the risk of plate dropping.

[0141] The third aspect of the embodiments of the present application provides a 3D printing device. Please refer to Figures 1 to 18, including the pulse stripping module in the above embodiments or the pulse stripping tray provided in the second aspect of the present application, further includes a forming platform 4, an optical machine 5, and a control system 6. The forming platform 4 is arranged above the tray assembly 1 and can drive the printed part 7 to move in the vertical direction to realize the forming and stripping of the printed part 7. The optical machine 5 is arranged below the support assembly 2 and is used to penetrate the support 21 to expose and cure the bottom layer of the printed part 7. The control system 6 is associated with the forming platform 4, the optical machine 5, and the pulse gas supply assembly 3 respectively, and is used to send control signals to each component. The association of the control system 6 with the forming platform 4, the optical machine 5, and the pulse gas supply assembly 3 in this embodiment includes but is not limited to connection, physical connection, and communication connection, as long as it can enable each component to interact, communicate, and exchange data information.

[0142] In some embodiments of the present application, the control system 6 communicates with the pulse gas supply assembly 3 to generate a control instruction according to a pre-configured control strategy and send it to the pulse gas supply assembly 3.

[0143] The control instruction generated by the control system 6 according to the pre-configured control strategy in the embodiments of the present invention can also be used to control the pulse gas supply assembly 3 to increase or decrease the delivered gas. For example, the control strategy is configured as follows: when it is detected that the release film of the 3D printing device is higher than the preset calibration position, the air pressure of the gas in the 3D printing device is higher than the preset pressure range, the air flow of the gas in the 3D printing device is higher than the preset range, the concentration of the gas in the 3D printing device is higher than the preset concentration range, and the bearing force on the lower surface of the release film of the 3D printing device is greater than the bearing force on the upper surface, which means that at this time, the pulse gas supply assembly 3 has delivered too much gas to the 3D printer, and it is necessary to adjust the air pressure and concentration formed by the gas in the 3D printing device. Therefore, the control strategy at this time is to generate and send a first control instruction; wherein, the first control instruction includes controlling the pulse gas supply assembly 3 to reduce the delivered gas;

[0144] When it is detected that the release film of the 3D printing device is lower than the preset calibration position, the air pressure of the gas in the 3D printing device is lower than the preset pressure range, the air flow of the gas in the 3D printing device is lower than the preset range, the concentration of the gas in the 3D printing device is lower than the preset concentration range, and the bearing force on the upper surface of the release film of the 3D printing device is less than the bearing force on the lower surface, which means that at this time, the pulse gas supply assembly 3 has delivered too little gas to the 3D printing device, which may affect the curing effect of the resin material and make it difficult to strip it from the tray. It is necessary to adjust the air pressure and concentration formed by the gas in the 3D printing device. Therefore, the control strategy at this time is to generate and send a second control instruction, and the second control instruction includes controlling the pulse gas supply assembly 3 to increase the delivered gas.

[0145] It should be noted that the height of the release film 11, the gas pressure, airflow, concentration and the bearing capacity of the lower surface of the release film 11 can be directly collected based on the corresponding sensors, or can be obtained after data processing based on the data collected by the sensors. For example, in order to obtain the bearing capacity of the upper surface of the release film 11 of the 3D printing device, the volume of the printing material can be detected, and after converting it into weight, the bearing capacity of the surface of the release film 11 can be determined; by setting a weighing sensor at the bottom of the material tray and detecting the total weight of the material tray and the printing material, the bearing capacity of the surface of the release film 11 can be determined, that is, the balance of the action and reaction forces between the upper and lower surfaces of the film.

[0146] Accordingly, in one embodiment, the building platform 4 has an avoidance design 83 for avoiding the auxiliary part 84. The avoidance design 83 can prevent the building platform 4 from pressing on the auxiliary part 84 when the building platform 4 is pressed down during the 3D printing process. It should be noted that if the building platform 4 presses on the auxiliary part 84, since the auxiliary part 84 has a certain thickness, this will cause the first layer to be printed thicker, which may cause the risk of printing failure such as the print falling off the building platform 4.

[0147] In one embodiment, the avoidance design 83 is at least one of an avoidance cut corner, an avoidance groove, etc. Specifically, the position of the molding platform 4 corresponding to the auxiliary component 84 can be directly cut off; or a concave structure can be provided at the position of the molding platform 4 corresponding to the auxiliary component 84 to accommodate the corresponding auxiliary component 84.

[0148] Specifically, Figures 7 to 11 In the embodiment shown in , the molding platform 4 forms avoidance cut angles at positions corresponding to the auxiliary parts 84. Figures 13 to 15 In the embodiment shown in , corresponding avoidance grooves are respectively provided on the periphery of the molding platform 4 so as to be staggered with the auxiliary member 84 when the molding platform 4 is pressed down. Figures 6 to 8 The implementation scheme of can also make similar avoidance design.

[0149] In the 3D printing device provided in the embodiment of the present application, the pulse stripping module can be controlled as an independent module. When pulse stripping is required, the control system 6 only needs to send an action signal to the gas oscillation component 31, so that the gas pipeline 32 can output a pulse gas flow with a predetermined pulse frequency and output pressure, forming a closed-loop control system, and the gas pipeline setting method and control method are simple. The pulse stripping module can also be used as a part of the 3D printing device and controlled by the control system of the 3D printer.

[0150] In some embodiments, the support assembly 2 is disposed on a base 81 , which is a part of a housing of the 3D printing device.

[0151] A fourth aspect of the embodiments of the present application provides a 3D printing method. Please refer to Figure 10 , and the 3D printing device in the above embodiment is adopted, including the following steps:

[0152] Step 1: Obtain a set of sliced images corresponding to the 3D model to be printed, and calculate the printing difficulty value corresponding to each layer of sliced images;

[0153] Specifically, input the 3D model of the printed part 7 into the computer, and obtain a set of sliced images corresponding to the printed part 7 through the control system 6 installed in the computer. Calculate the printing difficulty value corresponding to each layer of sliced images based on the cross-sectional information corresponding to the sliced images. The confirmation method of the printing difficulty value can refer to the Chinese patent application document with the application number 202310235431.5.

[0154] Step 2: Based on the printing difficulty value, determine the printing parameters and pulsed air flow parameters corresponding to each layer of sliced images;

[0155] Specifically, the determination of the printing parameters can refer to the Chinese patent application document with the application number 202310235431.5. The pulsed air flow parameters include the pulse frequency and the output air pressure. Among them, there is a direct proportional relationship between the pulse frequency and the printing difficulty value. The greater the printing difficulty value, the greater the pulse frequency. This is because when the printing difficulty value is relatively large, it usually means that there are a large number of cross-sections of the printed part 7 in this layer or the minimum distance between cross-sections is relatively small, etc., and fine printing and peeling are required. The greater the pulse frequency, the faster the shaking and the greater the amplitude of the release film 11. The release film 11 and the bottom layer of the printed part 7 can reach the critical peeling angle θ more quickly, reducing the peeling force while improving the peeling efficiency. Preferably, the value range of the pulse frequency is 0.1 Hz - 50000 Hz.

[0156] The output air pressure is in direct proportion to the volume of the gas chamber. When the volume of the gas chamber is small, if the output air pressure is too large, it will cause the release film 11 to arch, which is not conducive to the oscillation of the release film 11; when the volume of the gas chamber is large, if the output air pressure is too small, the oscillation of the release film 11 will not be obvious. Preferably, the value range of the output air pressure is 0.1 Pa - 100000 Pa.

[0157] Step 3: Determine the model printing operation corresponding to each layer of sliced images based on the printing parameters, and determine the model peeling operation corresponding to each layer of sliced images based on the pulsed air flow parameters.

[0158] Specifically, a liquid photosensitive resin material is contained in the material trough formed by enclosing the release film 11 and the material tray body 12. After the printing starts, the forming platform 4 is lifted and lowered to realize the layer-by-layer printing of the printed part 7. When printing the nth layer, the forming platform 4 presses down to make the bottom of the printed part 7 contact with the liquid photosensitive resin material in the material tray, and the light machine 5 performs exposure curing according to the cross-sectional shape of the sliced picture corresponding to this layer. After the exposure ends, the control system 6 communicates with the gas vibration assembly to convey pulsed air flow into the gas chamber, breaking the vacuum adsorption state between the release film 11 and the support member 21. After the release film 11 is separated from the support member 21, the pulsed air flow oscillates the release film 11, and the forming platform 4 rises to start the peeling operation between the printed part 7 and the release film 11. When the model is peeled, pulsed air flow is introduced into the air inlet 211 at a pulse frequency, causing the volume of the gas chamber to change periodically, and the change frequency is approximate to the pulse frequency, causing the release film 11 to oscillate periodically. The frequency and amplitude of this oscillation effect are related to the control signal sent by the control system 6 to the gas vibration assembly 31, so that the peeling angle critical value θ between the release film 11 and the bottom layer of the printed part 7 is reached faster, as Figure 5 shown, which can significantly reduce the peeling force and the peeling stroke.

[0159] After the peeling ends, the forming platform 4 returns to zero again, the pulsed air flow stops or weakens, and the oscillation of the release film 11 stops or weakens. At this time, the next layer (i.e., the n + 1 layer) can be printed.

[0160] In order to verify the peeling effect of the pulsed peeling module provided in the embodiments of the present application, the inventor applied the pulsed peeling module provided in the present application to the Reflex printer of Blackmagic Technology, used the Blackmagic Technology PAU10 material for 3D printing, and provided the following verification embodiments:

[0161] Verification Embodiment 1: Print a cantilever beam model and a bridge model, which can be used to evaluate the effectiveness of pulsed peeling and the effect on reducing the support density. Since the cantilever beam model has a cantilever beam extending to one side, when peeling, if the peeling force is too large, the cantilever beam will be bent, resulting in a limited cantilever span. When printing with a 3D printing device in the prior art, the forming span is usually 1.2 mm. And when the bridge model has a large span between two fulcrums, if the peeling force is too large, the middle beam will be bent. To avoid this problem, the support density often needs to be increased. When printing the PAU10 material with a 3D printing device in the prior art, the span between the two fulcrums is only 2.6 mm.

[0162] When printing with a Reflex printer equipped with a pulse peeling module, due to the reduced peeling force, the effectiveness of peeling in the pulse peeling mode is improved. The forming span of the single cantilever beam increases from 1.2 mm to 1.6 mm, and the forming span of the bridge model increases from 2.6 mm to 3.4 mm. The equivalent calculated support density can be reduced by 20%.

[0163] Verification Example 2: Printing a micro-scale model can be used to evaluate the improvement of the printing success rate of small parts by pulse peeling and the optimization effects of peeling force and printing time. Since the size of the micro-scale model is small, both the printing difficulty and the peeling difficulty are relatively high. When printing with a 3D printing device in the prior art, some details cannot be completely printed.

[0164] When printing with a Reflex printer equipped with a pulse peeling module, the micro-scale model can be completely printed, and the peeling force value during printing decreases by 20% - 50%, and the printing time is shortened by 40%.

[0165] Verification Example 3: Printing a test model for detailed forming parts can be used to evaluate the optimization of detailed forming by pulse peeling. Since the cross-section of the test model for detailed forming parts is small, when printing with a 3D printing device in the prior art, a cylinder with a diameter of 0.6 mm and a height of 10 mm can be completely formed in the peeling state, but there are incomplete details with an accuracy of 0.1 mm.

[0166] When printing with a Reflex printer equipped with a pulse peeling module, a cylinder with a diameter of 0.3 mm and a height of 10 mm can be completely formed, and the minimum forming detail reaches within 0.08 mm.

[0167] Verification Example 4: Printing a long-life running test piece can be used to evaluate the optimization of the life of the material tray by pulse peeling.

[0168] When printing with a Reflex printer equipped with a pulse peeling module, there is no abnormal situation in the surface quality of the printed part 7 during peeling. Compared with the material tray in the prior art, due to the significantly reduced peeling force, the life of the release film 11 in this application can be increased by 27% - 38%.

[0169] Verification Example 5: Printing a peeling stroke test piece can be used to evaluate the optimization of the peeling stroke by pulse peeling. Please refer to Figure 4 and Figure 5 , when printing with a 3D printing device in the prior art, the release film 11 in the material tray assembly 1 will undergo elastic deformation under the pulling action of the bottom layer of the printed part 7 until the bottom layer of the printed part 7 and the release film 11 reach the critical peeling angle θ, as shown in Figure 4 shown, the peeling stroke is relatively long.

[0170] When printing with a Reflex printer equipped with a pulse stripping module, since the release film 11 can undergo high-frequency oscillation under the action of the pulsed air flow, the critical value θ of the stripping angle can be reached faster between the bottom layer of the printed part 7 and the release film 11, as Figure 5 shown, the stripping stroke can be reduced by 32% - 47%, which is beneficial to improving the stripping efficiency.

[0171] From the above embodiments, it can be seen that the pulse stripping module and the pulse stripping tray provided by the embodiments of the present application can significantly reduce the stripping force during stripping, which is beneficial to improving the forming accuracy of the model, enhancing the effectiveness of pulse stripping, and extending the service life of the release film 11; after reducing the stripping stroke, the stripping time can be significantly reduced, the stripping efficiency can be improved, and the printing time can be reduced.

[0172] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that alternative or additional steps may be used.

[0173] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms do not imply an order or sequence when used herein. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0174] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A pulse stripping module, characterized in that, Comprising: A tray assembly (1), the tray assembly (1) having a release film (11); A support assembly (2), the support assembly (2) being disposed below the tray assembly (1), the support assembly (2) having a support member (21), the support member (21) having a first preset distance from the release film (11) in the height direction for forming a gas chamber between the support member (21) and the release film (11); an air inlet (211) and an air outlet (212) communicating with the gas chamber are respectively provided on the support member (21); A pulsed gas supply assembly (3), the pulsed gas supply assembly (3) including a gas oscillation assembly (31) and a gas pipeline (32), the gas oscillation assembly (31) being disposed on the gas pipeline (32), the gas pipeline (32) being connected to the air inlet (211); when a printed part (7) is peeled off from the release film (11), the pulsed gas supply assembly (3) inputs a pulsed air flow into the gas chamber through the air inlet (211) to cause the release film (11) to generate periodic oscillations.

2. The pulse stripping module according to claim 1, wherein A seal (22) is provided along the circumference of the support member (21), and the seal (22) is used for connecting with the tray assembly (1).

3. The pulse stripping module according to claim 2, characterized in that, A circulation port (221) communicating with the gas chamber is provided on the seal (22).

4. The pulse stripping module according to claim 1, wherein An auxiliary member (84) is provided on the side of the support member (21) facing the release film (11) so that when the release film (11) is attached to the support member (21) and has a tendency to move away from the support member (21), a peeling cut angle is formed between the release film (11) and the support member (21).

5. The pulse stripping module according to claim 4, wherein The number of the auxiliary members (84) is at least two and they are dispersedly arranged along the circumference of the support member (21) to form a gas chamber with a consistent height between the support member (21) and the release film (11).

6. The pulse stripping module according to claim 5, characterized in that The number of the auxiliary members (84) is four and they are respectively corresponding to the four corners of the support member (21); or, the number of the auxiliary members (84) is four and they are respectively corresponding to the four edges of the support member (21).

7. The pulse stripping module according to claim 4, characterized in that, The auxiliary member (84) is any one or a combination of a tape, a plastic plate, a metal gasket, a foam, a wooden thin plate, a fiber cloth.

8. The pulse stripping module according to claim 1, characterized in that, The pulsed gas supply assembly (3) further includes a control valve (34) to control the gas to enter the gas chamber according to preset requirements.

9. The pulse stripping module according to any one of claims 1 to 8, characterized in that, The support member (21) is a transparent rigid support member (21a) or a transparent flexible support member (21b).

10. The pulse stripping module according to claim 9, characterized in that, When the support assembly (2) is a transparent flexible support member (21b), a rigid substrate (23) is further provided below the transparent flexible support member (21b).

11. The pulse stripping module according to claim 1, wherein The support member (21) is one or a combination of a fluoropolymer film, a polydimethylsiloxane film, a polymethylpentene film, an acrylic adhesive, a polymethyl methacrylate, a polytetrafluoroethylene, a polyethylene terephthalate, a fluorinated ethylene-ethylene copolymer, a polyethylene, a polypropylene, a polyvinyl chloride, a photosensitive resin, a thermosensitive resin, a glass, a screen.

12. The pulse stripping module according to claim 1, wherein, The air inlet (211) and the air outlet (212) are connected to the pulsed gas supply assembly (3).

13. A pulse stripping tray, characterized in that, The pulsed stripping tray has a release film (11) and a support member (21). The support member (21) has a second preset distance from the release film (11) in the height direction to form a gas chamber between the support member (21) and the release film (11). An air inlet (211) and an air outlet (212) communicating with the gas chamber are respectively provided on the support member (21); The air inlet (211) and the air outlet (212) are used to connect to the pulsed gas supply assembly (3). When the printed part (7) is stripped from the release film (11), the pulsed gas supply assembly (3) inputs a pulsed air flow into the gas chamber through the air inlet (211) to cause the release film (11) to generate periodic oscillations.

14. The pulse stripping tray according to claim 13, wherein The support member (21) is a transparent flexible support member (21b).

15. The pulse stripping tray according to claim 14, wherein, The transparent flexible support member (21b) is one or a combination of a fluoropolymer film, a polydimethylsiloxane film, a polymethylpentene film, an acrylic adhesive, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, a fluorinated ethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, a photosensitive resin, and a thermosensitive resin.

16. The pulse stripping tray according to claim 14, wherein The support assembly (2) further includes a rigid substrate (23) disposed below the transparent flexible support member (21b).

17. The pulse stripping tray according to claim 13, wherein, An auxiliary member (84) is disposed on the side of the support member (21) facing the release film (11) so that when the release film (11) is attached to the support member (21) and has a tendency to move away from the support member (21), a peeling cut angle is formed between the release film (11) and the support member (21).

18. The pulse stripping tray according to claim 17, characterized in that, The number of the auxiliary members (84) is at least two and they are dispersedly disposed along the circumference of the support member (21) to form a gas chamber with a consistent height between the support member (21) and the release film (11).

19. The pulse stripping tray according to claim 18, wherein, The number of the auxiliary members (84) is four and they are respectively disposed corresponding to the four corners of the support member (21); or, the number of the auxiliary members (84) is four and they are respectively disposed corresponding to the four edges of the support member (21).

20. The pulse stripping tray according to claim 19, wherein The auxiliary member (84) is any one or a combination of a tape, a plastic plate, a metal gasket, a foam, a wooden thin plate, and a fiber cloth.

21. The pulse stripping tray according to claim 13, wherein A position sensor (13) is provided on the tray body (12), and the position sensor (13) is used to detect the position data of the release film.

22. A 3D printing device, comprising the pulse stripping module of any one of claims 1 to 12 or the pulse stripping tray of any one of claims 13 to 21, characterized in that, It further includes a forming platform (4), an optical machine (5), and a control system (6). The forming platform (4) is disposed above the tray assembly (1), the optical machine (5) is disposed below the support assembly (2), and the control system (6) is respectively associated with the forming platform (4), the optical machine (5), and the pulsed gas supply assembly (3).

23. The 3D printing device according to claim 22, characterized in that, The control system (6) communicates with the pulsed gas supply assembly (3) to generate a control instruction according to a pre-configured control strategy and send it to the pulsed gas supply assembly (3).

24. The 3D printing device according to claim 23, wherein, The control strategy is configured to: When one or more of the following conditions are detected: the release film (11) of the 3D printing device is higher than a preset calibration position, the air pressure of the gas in the 3D printing device is higher than a preset pressure range, the air flow of the gas in the 3D printing device is higher than a preset range, the concentration of the gas in the 3D printing device is higher than a preset concentration range, and the force on the lower surface of the release film (11) of the 3D printing device is greater than the force on the upper surface, generate and send a first control instruction; wherein, the first control instruction includes controlling the gas delivered by the pulsed gas supply component (3) to decrease; When one or more of the following conditions are detected: the release film (11) of the 3D printing device is lower than a preset calibration position, the air pressure of the gas in the 3D printing device is lower than a preset pressure range, the air flow of the gas in the 3D printing device is lower than a preset range, the concentration of the gas in the 3D printing device is lower than a preset concentration range, and the force on the upper surface of the release film (11) of the 3D printing device is less than the force on the lower surface, generate and send a second control instruction; wherein, the second control instruction includes controlling the gas delivered by the pulsed gas supply component (3) to increase.

25. The 3D printing device according to claim 22, characterized in that, The forming platform (4) has an avoidance design (83) for avoiding the auxiliary part (84).

26. The 3D printing device according to claim 25, characterized in that, The avoidance design (83) is at least one of an avoidance chamfer and an avoidance groove.

27. A 3D printing method, which uses the 3D printing device according to any one of claims 22 to 26, is characterized in that, It includes the following steps: Obtain a set of sliced pictures corresponding to the 3D model to be printed, and calculate the printing difficulty value corresponding to each layer of the sliced pictures; Based on the printing difficulty value, determine the printing parameters and pulsed air flow parameters corresponding to each layer of the sliced pictures; Based on the printing parameters, determine the model printing operation corresponding to each layer of the sliced pictures, and based on the pulsed air flow parameters, determine the model peeling operation corresponding to each layer of the sliced pictures.

28. The 3D printing method according to claim 27, wherein The pulsed air flow parameters include a pulse frequency, and there is a direct proportional relationship between the pulse frequency and the printing difficulty value.

29. The 3D printing method according to claim 28, wherein The model peeling operation includes: when peeling the model, introducing pulsed air flow into the air inlet (211) at the pulse frequency, causing the volume of the gas chamber to change periodically, and causing the release film (11) to oscillate periodically.

Images