CN113386347A

CN113386347A - 3D printing method

Info

Publication number: CN113386347A
Application number: CN202010174171.1A
Authority: CN
Inventors: 牟德康; 贺云; 博尔金海伦
Original assignee: Sc Tech Beijing Co ltd
Current assignee: Sc Tech Beijing Co ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2021-09-14
Anticipated expiration: 2040-03-13
Also published as: CN113386347B

Abstract

A3D printing method. The 3D printing method comprises the following steps: driving the forming platform to an initial forming position, forming a forming area between the forming platform and the release film, and positioning the release film in the trough assembly; controlling the release film to be in a first state; providing light to illuminate the molding area to form a polymeric layer on the molding surface; controlling the release film to deform in the direction away from the forming platform, so that the polymerization layer and the release film are gradually separated from the periphery of the contact surface to the center, and meanwhile, the printing material is gradually filled along the separation gap; driving the forming platform to a next forming position; recovering the release film to the first state; providing light to illuminate the molding area to form a next polymeric layer on the molding surface; at least one next polymeric layer is formed on the molding surface. The 3D printing method is beneficial to demolding of the printing model and backflow of the printing material, and therefore 3D printing efficiency and 3D printing quality can be improved.

Description

3D printing method

Technical Field

Embodiments of the present disclosure relate to a 3D printing method.

Background

Digital Light Processing (DLP) mode 3D printing technology is an additive manufacturing technology that performs 3D printing with liquid materials. One printing technique uses a top-down light projection, i.e., a light source is located at the bottom of a tank (liquid container) where the curing reaction takes place. When each layer is solidified, different printing modes can be realized by controlling the upward movement of the forming platform and the switch of the light source.

Disclosure of Invention

At least one embodiment of the present disclosure provides a 3D printing method, including: driving a forming platform to an initial forming position, and forming a forming area between the forming platform and a release film, wherein the release film is positioned in a trough assembly; controlling the release film to be in a first state so as to keep the thickness of the printing material between the molding surface of the molding platform and the release film; providing light to illuminate a molding area to cure the printing material illuminated by the light and located between the molding platform and the release film and form a polymeric layer on the molding surface; controlling the release film to deform towards the direction far away from the forming platform, so that the polymeric layer and the release film are gradually separated from the periphery of the contact surface to the center, and meanwhile, the printing material is gradually filled along the separation gap; driving the forming platform to a next forming position; recovering the release film to the first state; providing light to illuminate a molding area to cure the printing material illuminated by the light and located between the molding platform and the release film and form a next polymeric layer on the molding surface; at least one next polymeric layer is formed on the molding surface.

For example, in the 3D printing method provided by at least one embodiment of the present disclosure, the release film is deformed or in the first state in a direction away from the forming platform by controlling a magnitude relationship between a pressure of the release film at a side away from the forming platform and a pressure of the release film at a side close to the forming platform.

For example, in the 3D printing method provided by at least one embodiment of the present disclosure, a breathing cavity is disposed on one side of the release film close to the forming platform, and a pressure of the breathing cavity is adjustable through the light-transmissive fluid. Preferably, the light-transmissive fluid comprises a light-transmissive gas and/or a light-transmissive liquid.

For example, in the 3D printing method provided by at least one embodiment of the present disclosure, a breathing chamber is disposed on a side of the release film away from the forming platform, and a pressure of the breathing chamber is adjustable through the light-transmissive fluid. Preferably, the light-transmissive fluid comprises a light-transmissive gas and/or a light-transmissive liquid.

For example, in the 3D printing method provided by at least one embodiment of the present disclosure, the release film is in the first state by providing positive pressure to a breathing cavity on a side away from the forming platform; or the negative pressure is provided for the breathing cavity close to one side of the forming platform, so that the release film is in the first state.

For example, in the 3D printing method provided by at least one embodiment of the present disclosure, under the condition that a breathing cavity is formed in one side of the release film, which is away from the forming platform, a transparent support plate is disposed on one side of the release film, which is away from the forming platform, the breathing cavity is formed by the release film and the transparent support plate, and the distance between the release film and the transparent support plate is 0.05mm-5mm in the first state.

For example, at least one embodiment of the present disclosure provides a 3D printing method, in which the positive pressure is provided to the breathing cavity, including: and controlling the air pressure of the breathing cavity to be equal to or higher than the atmospheric pressure.

For example, in a 3D printing method provided by at least one embodiment of the present disclosure, the above-atmospheric pressure is not more than 0.1Kpa above atmospheric pressure.

For example, in the 3D printing method provided by at least one embodiment of the present disclosure, the pressure of the release film on the side away from the forming platform is controlled to be lower than the pressure of the release film on the side close to the forming platform, and: providing negative pressure for the breathing cavity on one side far away from the forming platform to enable the release film to deform in the direction far away from the forming platform; or the positive pressure is provided by the breathing cavity close to one side of the forming platform so as to lead the release film to be deformed in the direction far away from the forming platform.

For example, in a 3D printing method provided by at least one embodiment of the present disclosure, a breathing cavity is formed in a side of the release film away from the forming platform, and negative pressure is provided to the breathing cavity to deform the release film in a direction away from the forming platform, including: a transparent support plate is arranged on one side of the release film, which is far away from the forming platform, and the release film and the transparent support plate form the breathing cavity; and providing negative pressure for the breathing cavity between the release film and the transparent support plate so as to deform the release film in the direction of the transparent support plate.

For example, in the 3D printing method provided in at least one embodiment of the present disclosure, the magnitude of the negative pressure provided is 0.1KPa to 10KPa less than the atmospheric pressure.

For example, in the 3D printing method provided by at least one embodiment of the present disclosure, the external force is applied to the release film, so that the release film deforms or is in the first state in a direction away from the forming platform.

For example, at least one embodiment of the present disclosure provides a 3D printing method, wherein the chute assembly includes a chute including an annular frame enclosing a first opening and a second opening opposite to each other; set up from the type membrane ring frame's second opening side just covers the second opening be provided with the moving member from type membrane department, this moving member structure is for can driving from the type membrane reciprocates, makes through to exert external force from the type membrane it takes place to deform or be in to the direction of keeping away from the shaping platform from the type membrane the first state includes: the moving piece is moved to enable the release film to deform towards the direction far away from the forming platform or to be in the first state.

For example, in the 3D printing method provided by at least one embodiment of the present disclosure, the moving member includes a pressing block located above the release film and an adsorbing block located below the release film, and the adsorbing block can drive the pressing block to move up and down. Preferably, the pressing block and the suction block are disposed at an edge region of the release film at the second opening.

For example, in a 3D printing method provided by at least one embodiment of the present disclosure, the moving of the chute assembly, and applying an external force to the release film to deform the release film in a direction away from the forming platform or to be in a first state includes: through reciprocating the silo subassembly makes from the type membrane to the direction of keeping away from the shaping platform deformation or be in the first state.

For example, in a 3D printing method provided by at least one embodiment of the present disclosure, the driving a forming platform to a next forming position includes: the forming table is driven to move by a displacement equal to the thickness of each polymeric layer.

For example, in a 3D printing method provided by at least one embodiment of the present disclosure, driving the forming platform to move by a displacement equal to the thickness of each polymeric layer includes: driving the forming platform to move a first distance in a direction away from the release film so that the forming platform is located at a middle position, driving the forming platform to move a second distance from the middle position towards the release film so that the forming platform is located at a next forming position, wherein the first distance is greater than the second distance, and the difference between the first distance and the second distance is equal to the thickness of each polymerization layer; or driving the forming platform to move towards the direction far away from the release film by a distance equal to the thickness of each polymerization layer.

For example, in the 3D printing method provided by at least one embodiment of the present disclosure, the controlling of the deformation of the release film in the direction away from the forming platform is performed before, simultaneously with, or after the driving of the forming platform to the next forming position.

For example, in the 3D printing method provided by at least one embodiment of the present disclosure, based on a flat tensioned state of a release film, an absolute value of a deformation amount generated by the release film in the first state is not greater than 0.5mm, optionally, not greater than 0.3mm or not greater than 0.15 mm.

For example, in a 3D printing method provided in at least one embodiment of the present disclosure, the controlling of the release film to deform in a direction away from the forming platform includes: and taking the release film in the first state as a reference, so that the deformation amount of the release film at the maximum deformation position in the direction far away from the forming platform is greater than 0.1 mm.

For example, the deformation amount at the maximum deformation position of the release film is based on the separation of the release film from the polymeric layer, that is, in the actual printing process, the deformation amount at the maximum deformation position of the release film is controlled within a range greater than 0.1mm, and the foregoing range is controlled on the premise that the separation of the release film from the polymeric layer can be realized, for example, the deformation amount at the maximum deformation position of the release film can be controlled: based on the release film in the first state, the deformation amount of the release film at the maximum deformation position is 0.15mm or 0.2mm or 0.25mm or 0.3mm or 0.35mm or 0.4mm or 0.45mm or 0.5 mm.

For example, after the release film deforms towards the transparent support plate, the distance between the release film and the transparent support plate at the position of the maximum deformation is 0-3 mm.

The atmospheric pressure herein is a standard atmospheric pressure of the environment in which the printing process is performed.

Herein, the absolute value of the amount of deformation generated by the release film in the first state is not more than 0.5mm, which can be understood as: maintain from the type membrane is in straight tensioning state, or control from the type membrane to keeping away from the deformation volume that the shaping platform direction produced is not more than 0.5mm, or control from the type membrane to the orientation the deformation volume that the shaping platform direction produced is not more than 0.5mm, that is, the deformation volume of every point department is not more than 0.5 mm.

Further, the aforesaid making the air pressure in the breathing cavity equal to or higher than the atmospheric pressure, and then controlling the absolute value of the deformation amount generated from the release film to the transparent support plate direction to be not more than 0.5mm, can be understood as: maintain from the type membrane with interval between the transparent support plate is 0.05mm-5mm, perhaps maintain under straight tensioning state from the type membrane with interval between the transparent support plate, perhaps control from the type membrane to the deformation volume that the transparent support plate direction produced is not more than 0.5mm, perhaps control from the type membrane dorsad the deformation volume that the transparent support plate direction produced is not more than 0.5mm, perhaps makes atmospheric pressure in the breathing chamber is higher than the purpose of atmospheric pressure and offsets the gravity of printing the material.

For example, in a 3D printing method provided by at least one embodiment of the present disclosure, when negative pressure is provided to the breathing cavity between the release film and the transparent support plate, providing the negative pressure includes: and providing the negative pressure at a constant speed, at a uniform acceleration or at a uniform deceleration so as to enable the negative pressure to reach a set value.

For example, in a 3D printing method provided by at least one embodiment of the present disclosure, when providing a positive pressure to the breathing cavity between the release film and the transparent support plate, providing the positive pressure includes: and providing the positive pressure at a constant speed, a uniform acceleration or a uniform deceleration so as to enable the positive pressure to reach a set value.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.

Fig. 1 is a schematic view of a 3D printing air pressure supply system according to at least one embodiment of the disclosure;

fig. 2 is another schematic diagram of a 3D printing air pressure supply system according to at least one embodiment of the disclosure;

fig. 3A is an exploded schematic view of a material tank assembly in a 3D printing air pressure supply system according to at least one embodiment of the present disclosure;

fig. 3B is another exploded view of a chute assembly in a 3D printing air pressure supply system according to at least one embodiment of the present disclosure;

FIG. 4 is a schematic plan view of the trough shown in FIG. 3A;

FIG. 5 is a schematic cross-sectional view of a sump assembly according to at least one embodiment of the present disclosure;

FIG. 6 is a schematic cross-sectional view of a sump assembly according to at least one embodiment of the present disclosure; and

fig. 7 is a schematic diagram of a 3D printing system provided in at least one embodiment of the present disclosure;

fig. 8 is a flowchart of a 3D printing method according to at least one embodiment of the present disclosure;

fig. 9-12 are schematic diagrams illustrating a 3D printing process performed by a 3D printing system according to at least one embodiment of the present disclosure;

fig. 13-16 are schematic diagrams of a 3D printing method provided by at least one embodiment of the present disclosure;

fig. 17-20 are another schematic diagrams of a 3D printing method provided by at least one embodiment of the present disclosure; and

fig. 21 to 24 are further schematic diagrams of a 3D printing method according to at least one embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The 3D printing apparatus adopting a Digital Light Processing (DLP) mode includes a forming platform, a lifting device, a material tank assembly, and a Light curing device (including a Light machine, for example). And a three-dimensional forming space is formed between the forming platform and the release film of the trough assembly, namely a forming area. Liquid 3D printing material places in the silo subassembly, and the ray apparatus is located the one side of keeping away from the shaping platform from the type membrane in order to radiate silo subassembly bottom, and elevating gear drive shaping platform rises and makes the solidification of printing a successive layer shaping.

In the 3D printing process, the forming platform needs to be immersed in the liquid 3D printing material in the trough assembly, then the material between the release film and the forming platform is cured through the light of the light machine, so that the cured material is formed on the forming platform, namely, a layer of polymerization layer is formed, and then the forming platform needs to rise by a certain height to form the next polymerization layer. When the molding stage is raised, the polymeric layer formed on the molding stage needs to be separated from the release film.

In some cases, because it is softer from type membrane itself, after liquid 3D printed material poured the silo subassembly into, the action of gravity because of liquid 3D printed material makes from type membrane production concave phenomenon. When the release film is too large, the printed material cannot be molded. In addition, when the forming platform rises, a certain adhesive force still exists between the polymerization layer formed on the forming platform and the release film, so that the polymerization layer and the release film are not easy to separate. In addition, after the polymeric layer and the release film are separated, enough liquid 3D printing material needs to be filled between the polymeric layer and the release film to perform printing of the next polymeric layer. For example, the liquid 3D printing material may be filled sufficiently by the reciprocating movement of the forming table and waiting for a certain time, however, this process often takes a longer time, thereby slowing down the speed of 3D printing.

At least one embodiment of the present disclosure provides a 3D printing air pressure supply system, and the 3D printing air pressure supply system includes a material tank assembly and an air pressure supply device, and the material tank assembly includes: the material tank comprises an annular frame, and the annular frame encloses a first opening and a second opening which are opposite to each other; a release film disposed on the second opening side of the ring frame and covering the second opening; the transparent supporting plate is positioned on one side of the release film, which is far away from the first opening; and the breathing cavity is positioned between the release film and the transparent support plate and comprises a first air vent, the first air vent is communicated with the air pressure supply device, and the air pressure supply device is configured to provide air pressure for the breathing cavity between the release film and the transparent support plate through the first air vent.

It will be appreciated by those skilled in the art that the transparent support plate is light transmissive, i.e. capable of transmitting light radiated by the light engine.

The utility model discloses an at least embodiment provides a 3D prints atmospheric pressure feed system, this system is one kind and assists the printing model to leave the system of type and liquid material backward flow through atmospheric control, atmospheric pressure feed arrangement among this 3D prints atmospheric pressure feed system can be controlled to provide atmospheric pressure (for example malleation or negative pressure) for the respiratory cavity between type membrane and the transparent support board, take place deformation to the direction of keeping away from the forming platform or to control from type membrane in the type membrane, or control interval between type membrane and the transparent support board in the silo subassembly, thereby can prevent from the recessed phenomenon that the type membrane caused because of 3D printing material's gravity, and be favorable to the polymerization layer to break away from the type membrane, and be favorable to liquid 3D printing material to fill fast backward flow to the polymerization layer and from between the type membrane, and then improve 3D printing speed and 3D printing quality.

The release film herein is a film having light transmitting properties for use in 3D printing, made of or composed of a material having oxygen-resistant properties or/and having anti-adhesive properties.

The 3D printing air pressure supply system, the 3D printing system, and the 3D printing method according to the present disclosure will be described below with reference to several specific embodiments.

Fig. 1 illustrates a schematic diagram of a 3D printing air pressure supply system provided by at least one embodiment of the present disclosure; fig. 2 illustrates a schematic diagram of another 3D printing air pressure supply system provided by at least one embodiment of the present disclosure; fig. 3A illustrates an exploded schematic view of a chute assembly in a 3D printing air pressure supply system provided by at least one embodiment of the present disclosure; fig. 4 is a schematic plan view of the trough shown in fig. 3A.

For example, in some embodiments, as shown in fig. 1-4, a 3D printing air pressure supply system 100 includes a chute assembly 10 and an air pressure supply device 20. The trough assembly 10 comprises a trough 1, a release film 3, a transparent support plate 6 and a breathing cavity 6A, wherein the trough 1 comprises an annular frame 110, the annular frame 110 encloses a first opening 101 and a second opening 102 which are opposite to each other, and the first opening 101 is a filling opening of the liquid 3D printing material; the release film 3 is disposed on a side of the annular frame 110 where the second opening 102 is located and extends out of the second opening 102 to cover the second opening 102. For example, the release film 3 is an oxygen impermeable film or an oxygen barrier film, for example, in some examples, the release film 3 is impermeable to oxygen, and further may be impermeable to all gases. The release film 3 is used for bearing a liquid 3D printing material; the transparent support plate 6 is positioned on one side of the release film 6 far away from the first opening 101; the breathing cavity 6A is located between the release film 3 and the transparent support plate 6, and is a cavity formed by the release film 3 and the transparent support plate 6 as upper and lower bottom surfaces. The breathing cavity 6A comprises a first air vent, which communicates with the air pressure supply means 20, the air pressure supply means 20 being configured to provide air pressure to the breathing cavity 6A between the release film 3 and the transparent support plate 6 through the first air vent.

For example, in some embodiments, as shown in fig. 1, the air pressure supply device 20 includes a first air port 202, a second air port 203, an air pressure source 201, and an air path switching device 204.

The first gas port 202 is in communication with a gas source 2021 for input of gas to the gas pressure source 201. The gas source 2021 may provide the required gas to the gas pressure supply 20. For example, the gas source 2021 may be the atmosphere or a gas supply containing a desired gas. For example, when the gas source 2021 is the atmosphere, the first gas port 202 can be directly connected to the atmosphere, and the gas supplied by the gas source is air; alternatively, in some examples, the gas source 2021 may be a gas supply device containing a desired gas, in which case, the gas supply device supplies the gas contained in the gas supply device, such as an oxygen-containing gas, a non-oxygen-containing gas, an inert gas, or any other suitable gas, to the air pressure supply device, as long as the gas does not react with the materials of the release film 3 and the transparent support 6.

For example, the second gas port 203 is in gas communication with the breathing chamber 6A through the first gas port for providing a certain gas pressure to the breathing chamber 6A. For example, in some embodiments, a first vent hole (described later) is disposed on the transparent support plate 6, and the first vent hole can be used as the first vent hole, and the second vent hole 203 communicates with the breathing cavity 6A between the release film 3 and the transparent support plate 6 through the first vent hole on the transparent support plate 6 to provide pressure to the breathing cavity 6A between the release film 3 and the transparent support plate 6.

For example, an air pressure source 201 is connected to a first air port 202 and a second air port 203. For example, the pneumatic source 201 includes a gas inlet 2011 and a gas outlet 2012, the gas inlet 2011 being in gas communication with the first gas port 202 or the second gas port 203, the gas outlet 2012 being used to exhaust gas within the pneumatic source 201. The air pressure supply means 20 can thus achieve the effect of providing a positive or negative pressure by means of the air pressure source 201. For example, in some embodiments, the air pressure source 201 includes an air pump, such as a micro air pump, which may provide, for example, an air pressure of about 0.02MPa and an air flow of about 0.5L.

For example, the gas path switching device 204 is connected to the gas inlet 2011, the first gas port 202 and the second gas port 203, and the gas path switching device 204 is configured to switch the gas communication of the gas inlet 2011 to the first gas port 202 or the second gas port 203. The air passage switching device 204 can thus control the operation mode of the air pressure source 201, so that the air pressure supply device 20 provides positive pressure or negative pressure.

For example, in some embodiments, gas outlet 2012 may also be switched by gas circuit switching device 204 into gas communication with second gas port 203 or first gas port 202. Whereby the auxiliary air pressure supply means 20 supplies positive or negative pressure.

For example, gas circuit switching device 204 is also coupled to gas outlet 2012 and is configured to switch gas communication from gas outlet 2012 to either first gas port 202 or second gas port 203. For example, when the air path switching device 204 connects the air inlet 2011 with the first air inlet 202 in a gas manner, the air outlet 2012 is switched to connect the air inlet 2012 with the second air inlet 203 in a gas manner, at this time, the air pressure source 201 can input air from the first air inlet 202 through the air inlet 2011 and output air from the second air inlet 203 through the air outlet 2012, so that the air pressure supply device 20 provides positive pressure for the air pressure device to be controlled, and the air pressure supply device 20 operates in a positive pressure mode. For example, when the air path switching device 204 connects the air inlet 2011 with the second air port 203 in an air manner, the air outlet 2012 is switched to connect the air to the first air port 202 in an air manner, at this time, the air pressure source 201 can input air from the second air port 203 through the air inlet 2011 and output air from the first air port 202 through the air outlet 2012, so that the air pressure supply device 20 provides negative pressure for the air pressure device to be controlled, and the air pressure supply device 20 operates in a negative pressure mode. At this time, when the air pressure supply device 20 is switched between the positive pressure mode and the negative pressure mode, the gas in the gas source 2021 flows back and forth in the trough assembly 10 and the air pressure source 201 of the air pressure supply device 20.

For example, in some embodiments, the air path switching device 204 includes a two-position five-way solenoid valve, and the two-position five-way solenoid valve can be switched between the positive pressure mode and the negative pressure mode by being powered on and off. For example, a two-position, five-way solenoid valve, when energized, may switch gas communication from outlet 2012 to second outlet 203 to provide positive pressure when gas inlet 2011 is in gas communication with first gas port 202; when the two-position five-way solenoid valve is powered off, the air outlet 2012 can be switched to be in gas communication with the first air outlet 202 when the air inlet 2011 is in gas communication with the second air outlet 203, so as to provide negative pressure. Or, when the two-position five-way solenoid valve is powered off, the gas outlet 2012 can be switched to be in gas communication with the second gas port 203 to provide positive pressure when the gas inlet 2011 is in gas communication with the first gas port 202; when the two-position five-way solenoid valve is powered on, the air outlet 2012 can be switched to be in gas communication with the first air inlet 202 when the air inlet 2011 is in gas communication with the second air inlet 203, so as to provide negative pressure.

For example, in some embodiments, the pneumatic supply further comprises a tee 211, the tee 211 being disposed between the two-position five-way solenoid valve and the pneumatic source 201 to enable a plumbing connection between the two-position five-way solenoid valve and the pneumatic source 201.

For example, as shown in FIG. 1, tee 211 includes a first end 2111, a second end 2112, and a third end 2113. The two-position five-way solenoid valve includes a first vent 2041, a second vent 2042, a third vent 2043, a fourth vent 2044, and a fifth vent 2045. For example, the first end 2111 of the three-way pipe 211 is connected to the gas outlet 2012 of the gas pressure source 201, the second end 2112 of the three-way pipe 211 is connected to the first vent 2041 of the two-position five-way solenoid valve, the third end 2113 of the three-way pipe 211 is connected to the fifth vent 2045 of the two-position five-way solenoid valve, and the third vent 2043, the fourth vent 2044 and the second vent 2042 of the two-position five-way solenoid valve are respectively connected to the first vent 202, the second vent 203 and the gas inlet 2011.

For example, in some embodiments, the pneumatic pressure supply device further includes a controller 213, and the controller 213 may control the operation mode of the pneumatic pressure supply device 20. For example, the controller 213 is configured to control the air passage switching device 204 to communicate the air outlet 2012 with the second air port 203 and communicate the air inlet 2011 with the first air port 202, and control the air pressure source 201 to input air from the first air port 202 through the air inlet 2011 and output air to the second air port 203 through the air outlet 2012 to provide positive pressure to the air pressure device to be controlled.

For example, in some embodiments, the controller 213 is further configured to control the air channel switching device 204 to communicate the air inlet 2011 with the second air port 203 and the air outlet 2012 with the first air port 202, and to control the air pressure source 201 to input air from the second air port 203 through the air inlet 2011 and output air to the first air port 202 through the air outlet 2012 to provide negative pressure for the air pressure device to be controlled.

For example, in some embodiments, the air pressure source 201 includes an air pump 2013, and the controller 213 is further configured to control the rotational speed and rotational time of the air pump 2013 to control the amount of positive or negative pressure provided by the air pressure source 201. At this time, the rotation speed and the rotation time of the air pump 2013 may be determined according to actual conditions such as the air pressure required by the air pressure device to be controlled, and the embodiment of the disclosure is not limited thereto.

For example, in some embodiments, the controller 213 is further configured to control the air pressure source 201 to alternately provide positive and negative pressures, thereby forming a positive and negative pressure alternating pattern (alternatively referred to as an intermittent pattern) to match the operating state of the device to be controlled. For example, the controller 213 may also control the air pressure source 201 to continuously provide positive pressure or negative pressure, so as to form a constant positive pressure mode or a constant negative pressure mode to match the working state of the air pressure device to be controlled.

For example, in some embodiments, the air pressure supply device 20 may further include an air filter 205, and the air filter 205 is disposed between the first air port 202 and the air path switching device 204 to filter the air input from the air source 2021. Thus, the gas entering the gas pressure supply device 20 is the pure required gas, and the gas provided by the gas pressure supply device 20 is also the pure required gas, so as to avoid the impurities possibly appearing in the gas of the gas pressure source 201 from polluting the gas pressure supply device 20 and the device to be controlled.

For example, in some embodiments, the air filter 205 may be electrically connected to the controller 213, and the controller 213 may be further configured to control the air filter 205 to operate to purge the gas entering the air pressure supply device 20 when the positive pressure is provided. For example, the controller 213 may also be configured to control the air filter 205 to operate to purge the gas entering the gas source 2021 when the negative pressure is provided, to facilitate recycling of the gas.

For example, in some embodiments, as shown in fig. 1, the air pressure supply device 20 further includes a pressure detection port 207 and a pressure sensor 208, and the breathing cavity 6A further includes a second vent port, through which the pressure detection port 207 is communicated to the breathing cavity 6A between the release film 3 and the transparent support plate 6, so that the pressure sensor 208 can detect the air pressure in the breathing cavity 6A through the second vent port. For example, in some examples, the first and second vents are disposed on opposite sides of the breathing chamber 6A. For example, in other examples, the first and second vents may be disposed on the same side of the breathing chamber 6A.

For example, in some embodiments, a first ventilation port and a second ventilation port (described later) are provided on the transparent support plate 6, and the first ventilation port and the second ventilation port are provided on opposite sides of the transparent support plate 6, thereby implementing the first ventilation port and the second ventilation port. For example, in another embodiment, a first ventilation opening and a second ventilation opening may be provided on the gasket 4 between the release film 3 and the transparent support plate 6, so as to implement the first ventilation opening and the second ventilation opening. The arrangement positions of the first vent and the second vent are not particularly limited in the embodiments of the present disclosure.

For example, the top film plate 7 (described later) of the chute assembly 10 may have

air vents

610A and 611A communicating with the first air vent and the second air vent, respectively, for connection with the air pressure supply device 20, and the second air vent 203 and the pressure detection port 207 may communicate with the

air vents

610A and 611A, respectively, for example, in gas communication with the

air vents

610A and 611A through a connection pipe, a connector, or the like. Alternatively, the top film plate 7 may not have a vent, but the first vent and the second vent are exposed to a space of the chute assembly, for example, a space of the 3D printing system under the chute assembly, and the second vent 203 and the pressure detection 207 are located under the first vent and the second vent through a connecting member, for example, a connecting pipe or the like, or directly contact the first vent or the second vent, so as to provide positive pressure or negative pressure to the respiratory cavity.

For example, in some embodiments, the pressure sensor 208 may be electrically connected to the controller 213, wherein the pressure sensor is configured to provide the controller 213 with a pressure value in the breathing chamber, and the controller 213 is configured to control the rotation speed of the air pump of the air pressure source 201 according to the pressure value to change the pressure level provided to the breathing chamber. Therefore, the air pressure supply device 20 can adjust the rotating speed of the air pressure source 201 in real time, so as to control the pressure supply state and the pressure supply size of the air pressure supply device 20 in real time, and accurately match the working state of the material tank assembly 10.

For example, in some embodiments, as shown in fig. 1, the air pressure supply device 20 may further include a throttle valve 209, a first end of the throttle valve 209 being communicated to the pressure detection port 207, and a second end of the throttle valve being communicated to the atmosphere or a gas collecting device 210. The throttle valve 209 can control the flow rate of gas flowing from the chute assembly 10 and removed from the pneumatic supply device 20. For example, when the gas source 2021 is atmospheric air such that the gas provided by the gas source 2021 is air, the second end of the throttle valve may be in communication with atmospheric air; when the gas source 2021 provides means for containing a desired gas, the second end of the throttle valve may communicate with the gas collecting means 210 to collect the gas discharged from the gas pressure supplying means 20. For example, the gas collected by the gas collecting device 210 may be recycled or may be uniformly treated to avoid air pollution.

For example, in some embodiments, as shown in fig. 1, the pneumatic pressure supply 20 further comprises another tee 212, the tee 212 being used to connect the pressure detection port 207, the pressure sensor 208, and the throttle valve 209. For example, tee 212 includes a fourth end 2121, a fifth end 2122, and a sixth end 2123, with fourth end 2121 connected to pressure sensing port 207, fifth end 2122 connected to pressure sensor 208, and sixth end 2123 connected to throttle valve 209, thereby providing a line connection between pressure sensing port 207, pressure sensor 208, and throttle valve 209.

For example, in some embodiments, the air pressure supply device 20 may further include a temperature control device 214, and the temperature control device 214 may be disposed, for example, between the second air port 203 and the air path switching device 204, for example, at a position near the second air port 203, for example, on a pipeline near the second air port 203, for controlling the temperature of the air output from the second air port 203.

For example, temperature control device 214 may include a temperature sensor that can monitor the temperature of the gas flowing out of second gas port 203, and a temperature control element that can heat or cool the gas flowing out of second gas port 203 based on the temperature monitored by the temperature sensor. For example, when the temperature sensor monitors that the temperature of the gas flowing out of the second gas port 203 is greater than a set value, the temperature control element cools until the temperature sensor monitors that the temperature of the gas flowing out of the second gas port 203 reaches a predetermined value; alternatively, when the temperature sensor monitors that the temperature of the gas flowing out of the second gas port 203 is less than the set value, the temperature control element heats until the temperature sensor monitors that the temperature of the gas flowing out of the second gas port 203 reaches a predetermined value. For example, the predetermined value may be determined according to the actual requirements of the chute assembly 10, and the embodiment of the disclosure is not particularly limited thereto.

In the above-mentioned air pressure supply device 20, the air path switching device 204 can control the switching between the first air port 202 and the second air port 203 and the air inlet 2011 and the air outlet 2012 of the air pressure source 201, so as to achieve the technical effect that the air pressure supply device 20 provides positive pressure or negative pressure, thereby achieving different pressure supply modes. In the above embodiment, a two-position five-way valve is taken as an example to be described as the air path switching device 204, in other embodiments of the present disclosure, the air path switching device 204 may also be implemented in other forms, and the specific form of the air path switching device 204 is not specifically limited in the embodiments of the present disclosure.

For example, in some embodiments, in addition to the first and

second gas ports

202 and 203 described above, as shown in fig. 2, the gas pressure supply device may further include a third gas port 301, the third gas port 301 being in gas communication with the atmosphere or a gas collection device for collecting gas output from the gas pressure source 201. For example, the outlet 2012 may be switched into gas communication with the second or

third ports

203, 301. In contrast to the above embodiment, the gas outlet 2012 of this embodiment is not switched to communicate with the gas source 2021, so that in the case where the gas pressure supply device provides negative pressure, the gas output from the gas pressure source 201 does not enter the gas pressure source 2021, but enters the atmosphere or the gas collection device through the third gas port 301. Thereby maintaining the purity of the gas in the gas pressure source 2021.

At this time, the gas circuit switching device 204 is configured to switch the gas inlet 2011 to be in gas communication with the first gas port 202 or the second gas port 203, and is also configured to switch the gas outlet 2012 to be in gas communication with the second gas port 203 or the third gas port 301. For example, when the gas inlet 2011 is in gas communication with the first gas port 202, the gas outlet 2012 is switched to be in gas communication with the second gas port 203, and when the gas inlet 2011 is in gas communication with the second gas port 203, the gas outlet 2012 is switched to be in gas communication with the third gas port 301.

Thus, in this embodiment, the airway switching device 204, under the control of the controller 213, can communicate the air outlet 2012 with the second air inlet 203 and communicate the air inlet 2011 with the first air inlet 202, and control the air pressure source 201 to input air from the first air inlet 202 and through the air inlet 2011, and output air to the second air inlet 203 through the air outlet 2012, so as to provide positive pressure to the device to be controlled in air pressure (i.e., the breathing chamber). The airway switching device 204 may also communicate the air inlet 2011 with the second air inlet 203 and communicate the air outlet 2012 with the third air inlet 301 under the control of the controller 213, and control the air pressure source 201 to input air from the second air inlet 203 through the air inlet 2011 and output air to the third air inlet 301 through the air outlet 2012, so as to provide negative pressure for the device to be controlled (i.e., the breathing chamber) by air pressure. Thereby, the air pressure supply device 20 provides positive pressure or negative pressure for the trough assembly 10.

For example, in other embodiments, the air path switching device 204 of the air pressure supply device 20 may include two air path switching sub-devices, namely, a first air path switching sub-device and a second air path switching sub-device. The first gas circuit switching sub-device is connected to the gas inlet 2011, the first gas port 202 and the second gas port 203, and is configured to switch the gas communication of the gas inlet 2011 to the first gas port 202 or the second gas port 203. The second pneumatic circuit switching sub-assembly is coupled to the gas outlet 2012, the second gas port 203 and the first gas port 202 and is configured to switch the gas communication from the gas outlet 2012 to either the first gas port 202 or the second gas port 203. It is thereby also possible to realize that the pressure supply device provides positive or negative pressure to the magazine assembly 10.

For example, in other embodiments, when the air circuit switching device 204 includes the third air port 301, the first air circuit switching sub-device is connected to the air inlet 2011, the first air port 202 and the second air port 203, and is configured to switch the air communication between the air inlet 2011 and the first air port 202 or the second air port 203. The second pneumatic circuit switching sub-assembly may also be coupled to the outlet 2012, the second gas port 203, and the third gas port 301, and configured to switch the pneumatic communication of the outlet 2012 to either the second gas port 203 or the third gas port 301. It is thereby also achieved that the pressure supply means provides a positive or negative pressure to the chute assembly 10, in particular to the breathing chamber.

For example, in the above embodiments, the first air path switching sub-device and the second air path switching sub-device may be two-position three-way solenoid valves or other devices that can achieve the above functions. The embodiment of the present disclosure does not limit the specific form of the air path switching sub-device 204.

For example, the controller 213 may be any type of control Device, such as a single chip, a Field Programmable Gate Array (FPGA), a Complex Programmable Logic Device (CPLD), or the like, and the controller 213 may include a memory and a processing unit, where the memory stores instructions, and when the processing unit executes the instructions stored in the memory, the controller executes the above control process, for example, controls the gas path switching Device to switch the gas path connection. Of course, the embodiments of the present disclosure are not limited thereto, and the controller 213 may also include any other suitable hardware, firmware, software or combination thereof with processing computing power, as long as the corresponding functions are realized. For example, the controller 213 may further include a resistor, a capacitor, an inductor, etc. to cooperate to achieve the corresponding functions.

For example, in some embodiments, the first vent 610 of the transparent support plate 6 is located at a peripheral portion of the transparent support plate 6. For example, the number of the first vents 610 may be plural, and the first vents 610 are uniformly distributed at the peripheral portion of the transparent support plate 6.

For example, the material of the release film 3 may be a non-stick material (such as a fluorine material), that is, the release film 3 may be a non-stick film, and the release film using the non-stick material realizes the release effect by utilizing the non-stick property between the release film and the material of the printed matter. In addition, the release film is an oxygen barrier film, i.e., is impermeable to oxygen, and further is impermeable to any gas, so that the tightness of the breathing chamber 6A can be ensured.

For example, the transparent support plate 6 may be made of glass or highly light-transmissive plastic. Transparent support plate 6 can prevent to pour into the feed liquid of silo 1 and make because of the action of gravity from the type membrane recessed volume too big, and reduce to produce plastic deformation or long-term creep deformation from type membrane 3 under the high pressure when printing to improve the life-span from type membrane 3.

For example, the distance between the release film 3 and the transparent support plate 6 is 0.05mm to 5mm at normal pressure, that is, one normal atmosphere, and the distance is formed by a spacer between the release film 3 and the transparent support plate 6, for example. For example, in one example, the release film 3 may be spaced from the transparent support plate 6 by 0.3 mm; for example, in another example, the distance between the release film 3 and the transparent support plate 6 may be 0.5mm or the like.

For example, as shown in fig. 3A and 4, the chute 1 may be a structure including only one ring of the ring frame 110, one end of the ring frame 110 encloses the first opening 101, the other end of the ring frame 110 encloses the second opening 102, and the ring frame 110 is a wall of the chute assembly. The ring frame 110 of the trough 1 comprises an inner side wall 111 and an outer side wall 112 connected to each other. A first end of the inner sidewall 111 surrounds the first opening 101 and a second end of the inner sidewall 111 surrounds the second opening 102.

For example, the outer sidewall 112 may include a hand-snap opening 113 to facilitate placement, installation, and securing of the spout assembly. For example, the first opening 101 may be rectangular in shape, and the hand-clasping opening 113 may be located on the outer sidewall 112 where the short side of the first opening 101 is located.

For example, as shown in fig. 3A, the first opening 101 is located at the upper end of the trough 1, the second opening 102 is located at the lower end of the trough 1, the release film 3 is disposed at the lower end of the trough 1, and the size of the release film 3 is larger than that of the second opening 102 to completely cover the second opening 102. For example, the peripheral edge of the release film 3 may be fixed at a position other than the second end of the inner sidewall 111. The orthographic projection of the second opening 102 of the trough 1 in a plane parallel to the transparent support plate 6 is located in the orthographic projection of the release film 3 in the plane, and the orthographic projection of the release film 3 in the plane is located in the orthographic projection of the first opening 101 of the trough 1 in the plane.

For example, the size of the space between the transparent support plate 6 and the release film 3 in the direction perpendicular to the transparent support plate 6 may be 0.05mm to 5 mm. For example, the size of the space between the transparent support plate 6 and the release film 3 may be 0.05-2 mm or 0.1-0.5 mm.

For example, the chute assembly 10 can also include a gasket 4 positioned between the release film 3 and the transparent support plate 6. Through setting up gasket 4 between from type membrane 3 and transparent support plate 6, can make and form the interval between from type membrane 3 and transparent support plate 6, and then gasket 4 with constitute respiratory cavity 6A from type membrane 3, transparent support plate 6 together. For example, the distance between the release film 3 and the transparent support plate 6, i.e., the thickness of the breathing chamber 6A, can be adjusted by selecting the thickness of the spacer 4.

For example, the shape of the spacer 4 may be annular, and the area surrounded by the annular spacer 4 is the above-mentioned space. For example, the shape of the spacer 4 may be a circular ring shape, a square ring shape, or the like, and the ring shape may be determined according to the shape of the trough. For example, the shape of the gasket may be a closed ring shape or a non-closed ring shape, i.e., a ring shape including a notch. The embodiment of the present disclosure is not limited to the shape of the spacer being a ring, for example, when the second opening of the trough is approximately rectangular, the spacer may also include or be a strip shape only located on two opposite sides of the rectangle, or may also include or be a block structure located at four corners of the rectangle, and the shape and position of the spacer may be determined according to the shape of the opening of the trough, and of course, the shape of the spacer may be a regular shape, or may also be an irregular shape. For example, when the number of the spacers is plural, the plural spacers may be uniformly distributed in the circumferential direction of the second opening, or may be non-uniformly distributed in the circumferential direction of the second opening.

For example, in the above embodiment, the transparent support plate 6 has the first ventilation hole 610 and the second ventilation hole 611 thereon to serve as the first ventilation hole and the second ventilation hole of the breathing chamber 6A. For example, in other embodiments, as shown in fig. 1, the gasket 4 may have a first vent hole and a second vent hole, so as to form a first vent hole and a second vent hole of the breathing cavity 6A. The embodiment of the present disclosure does not limit the formation positions of the first vent and the second vent of the breathing chamber 6A.

For example, as shown in fig. 3A, the orthographic projection of the gasket 4 on the release film 3 and the orthographic projection of the vent hole 610 on the release film 3 do not overlap.

As can be understood from the above description, a breathing chamber 6A is formed between the release film 3 and the transparent support plate 6 and in the area surrounded by the gasket 4, and this breathing chamber 6A can communicate with the air pressure supply device 20 through the first vent hole 610 on the transparent support plate or the first vent hole in the gasket 4. The air pressure supply device 20 can input or output the breathing cavity 6A through the first air vent 610 or the first air vent in the gasket 4, and the air pressure generated by air can be applied to the release film 3, so that the concave amount of the release film 3 when the material tank 1 is filled with liquid is reduced.

For example, the thickness of the gasket 4 may be 0.05mm to 5 mm. For example, the thickness of the spacer 4 may be 0.15mm, 2mm or 3 mm. The thickness of the gasket 4 is not limited in the embodiment, and can be adjusted according to actual requirements so as to meet the requirements of printing quality and printing success rate.

For example, the material of the spacer 4 may comprise plastic.

For example, as shown in fig. 3A, the chute assembly 10 may further include a squeeze film plate 5, the squeeze film plate 5 being located on a side of the release film 3 away from the chute 1 to fix the release film 3 at a portion of the ring frame 110 surrounding the second opening 102. For example, the squeeze film plate 5 may fix the peripheral edge portion of the release film 3 to the bottom of the ring frame 110 by the first fastening member 8. For example, the first fastening members 8 may be bolts, pins, and the like to achieve mutual connection and fastening.

For example, the squeeze film plate 5 has a third opening 501 opposite to the second opening 102, and the third opening 501 is used to expose the illumination area of the release film 3. For example, the squeeze film plate 5 includes a ring of first fixing portions surrounding the third opening 501, a first portion of the first fixing portions may press the release film 3 on the ring frame 110, and a second portion of the first fixing portions located outside the first portion may be provided with fastening holes for passing the first fastening members 8 to fix the squeeze film plate 5 at the bottom of the hopper 1.

For example, the orthographic projection of the transparent support plate 6 in a plane parallel to the transparent support plate 6 is located in the orthographic projection of the third opening 501 in the plane, i.e. the transparent support plate 6 may be passed through the third opening 501 during mounting or mounted in the third opening 501 so as to be in contact with the spacer 4.

For example, the orthographic projection of the opening in the middle of the spacer 4 in a plane parallel to the transparent support plate 6 is located within the orthographic projection of the third opening 501 of the lamination film plate 5 in the plane, that is, the orthographic projection of the spacer 4 in the plane overlaps with the orthographic projection of the third opening 501 in the plane, so that the spacer 4 can be attached to the transparent support plate 6 and a space is formed between the release film 3 and the transparent support plate 6.

For example, fig. 5 is a cross-sectional view of a chute assembly provided in accordance with an example of an embodiment provided by the present disclosure. As shown in fig. 5, the orthographic projection of the spacer 4 in the plane parallel to the transparent support plate 6 falls within the orthographic projection of the second opening 102 in the plane, and the orthographic projection of the spacer 4 in the plane overlaps with the orthographic projection of the squeeze film plate 5 in the plane, so that the squeeze film plate 5 can support the spacer 4 while fixing the release film 3 on the side of the trough 1 where the second opening 102 is located (i.e., the bottom of the trough 1).

For example, an orthographic projection of the third opening 501 in the above-mentioned plane is located within an orthographic projection of the second opening 102 in the above-mentioned plane to support the gasket 4.

Of course, the embodiment of the present disclosure is not limited to this, and an orthographic projection of the gasket 4 in the above-mentioned plane may overlap with an orthographic projection of the ring frame 110 in the above-mentioned plane, and an orthographic projection of the third opening 501 in the above-mentioned plane may be located in an orthographic projection of the second opening 102 in the above-mentioned plane, or may be located outside the orthographic projection of the second opening 102 in the above-mentioned plane. Therefore, the film pressing plate can fix the release film and the gasket at the bottom of the trough. At this moment, in order to ensure that the gasket can be positioned between the release film and the transparent support plate, the material of the gasket can be selected from flexible materials.

For example, the material of the squeeze film plate 5 may include an aluminum alloy or structural steel.

For example, as shown in fig. 3A, the silo assembly may further include a sealing ring 2, the sealing ring 2 being located on a side of the release film 3 facing the silo 1 and cooperating with the squeeze film plate 5 to fix the release film 3. The frictional force of sealing washer can make from type membrane fixed to guarantee not hard up from type membrane when following tensioning is from type membrane. The sealing washer can also play sealed effect to the feed liquid, prevents the feed liquid seepage. For example, the seal ring 2 may be made of nitrile rubber, silicone rubber, or fluororubber.

The embodiment of the disclosure can fix the release film through the trough, the sealing ring, the film pressing plate and the first fastener. For example, the release film can be directly fixed on the trough through a sealing ring, a film pressing plate and a first fastener; the release film can be fixed on the film pressing plate at first, and then the release film is fixed on the trough through the film pressing plate, which is not limited by the disclosure.

For example, when the orthographic projection of the spacer in a plane parallel to the transparent support plate overlaps with the orthographic projection of the lamination plate in the plane, the release film and the spacer can be fixed through the trough, the sealing ring, the lamination plate and the first fastener.

For example, as shown in fig. 3A, the chute assembly may further comprise a top film plate 7 located on a side of the transparent support plate 6 away from the release film 3, the top film plate 7 comprising an annular protrusion 710, the annular protrusion 710 contacting a surface of the transparent support plate 6 and supporting the transparent support plate 6 toward the first opening 101, i.e., the top film plate 7 is used to support the transparent support plate 6. The orthographic projection of the transparent support plate 6 in a plane parallel to the transparent support plate 6 falls within the orthographic projection of the second opening 102 in this plane.

For example, the top film plate 7 may have

air vents

610A and 611A communicating with the air vents 610 and 611 on the transparent support plate 6, respectively, for connection with the air pressure supply device 20. Second gas port 203 and pressure sensing port 207 may be in communication with

gas ports

610A and 611A, respectively, e.g., in gas communication with

gas ports

610A and 611A via connecting tubes, connectors, etc. Alternatively, the top film plate 7 may not have a vent, but the first vent and the second vent are exposed to a space of the chute assembly, for example, a space of the 3D printing system under the chute assembly, and the second vent 203 and the pressure detection 207 are located under the first vent and the second vent through a connecting member, for example, a connecting pipe or the like, or directly contact the first vent or the second vent, so as to provide positive pressure or negative pressure to the respiratory cavity.

For example, the annular protrusion 710 forms the fourth opening 701 around, and an orthographic projection of the fourth opening 701 in the above-mentioned plane is located in an orthographic projection of the third opening 501 of the lamination plate 5 and the second opening 102 of the trough 1 in the plane. That is, the dimensions of the annular protrusion 710 and the transparent support plate 6 are smaller than the dimensions of the second opening 102 and the third opening 501. From this, at the in-process of installation silo subassembly, after the position of leaving the type membrane is fixed by the pressure membrane board, the top membrane board can drive transparent support plate upwards to push up from the type membrane so that leave the type membrane tensioning. For example, the release film has a fixing surface after being fixed by the film pressing plate, and the top film plate and the transparent support plate can be lifted from the fixing surface of the release film by 1mm to 10 mm. For example, the jack-up tension amount in the present embodiment may be 2 mm.

For example, as shown in fig. 1, in some embodiments, the top film sheet 7 has a vent port 610A in communication with the first vent port of the breathing chamber 6A and a vent port 611A in communication with the second vent port of the breathing chamber 6A, so as to be in gas communication with the pressure supply device 20.

For example, as shown in fig. 3B, in other embodiments, the trough assembly 10 may further include a seal ring 9 and a seal ring 10. For example, a sealing ring 9 is provided between the transparent support plate 6 and the top membrane plate 7 to seal any gap that may exist between the transparent support plate 6 and the top membrane plate 7 after assembly of the chute assembly 10. A sealing ring 10 is provided between the top diaphragm plate 7 and the chute 1 to seal the gap between the top diaphragm plate 7 and the chute 1 after assembly of the chute assembly 10. From this, sealing washer 9 and sealing washer 10 can further seal silo subassembly 10 to guarantee at silo subassembly 10 equipment back, except that the ventilative mouth on a plurality of bleeder vents or the gasket in the transparent support plate 6, transparent support plate 6 with from forming inclosed space between the type membrane 3, and can not produce the gas leakage phenomenon.

For example, as shown in fig. 5, when the orthographic projection of the spacer 4 in the plane parallel to the transparent support plate 6 overlaps with the orthographic projection of the lamination film plate 5 in the plane, and the orthographic projection of the spacer 4 in the plane is completely located in the orthographic projection of the second opening 102 in the plane, the spacer 4 is supported by the lamination film plate 5 before the top film plate 7 brings the transparent support plate 6 to push the release film 3 upwards. Top film board 7 drives transparent support plate 6 upwards to push up from the in-process of type membrane 3, transparent support plate 6 earlier with the contact of gasket 4, then gasket 4 with will be jack-up together by transparent support plate 6 from type membrane 3, gasket 4 no longer is supported by pressure membrane board 5 promptly, but is supported by transparent support plate 6 and top film board 7, gasket 4, transparent support plate 6 and top film board 7 realize together the tensioning to from type membrane 3 to the messenger has better roughness from type membrane 3.

The present example is not limited thereto, and in the process that the top film plate moves the transparent support plate to push up the release film when one part of the gasket is fixed between the film pressing plate and the ring frame, the part of the other part of the gasket contacting with the transparent support plate is deformed, so that the tension on the release film is realized together with the top film plate and the transparent support plate, so that the release film has better flatness.

For example, fig. 6 is a cross-sectional structural schematic view of a chute assembly provided in accordance with another example of an embodiment of the present disclosure. As shown in fig. 6, the orthographic projection of the spacer 4 in a plane parallel to the transparent support plate 6 does not overlap with the orthographic projection of the lamination plate 5 in the plane, i.e., the orthographic projection of the spacer 4 in the above-mentioned plane is completely located in the orthographic projection of the third opening 501 of the lamination plate 5 in the plane, so that the spacer 4 is supported by the transparent support plate 6 disposed later.

For example, the squeeze film plate 5, the sealing ring 2 and the first fastener 8 fix the release film 3 at the bottom of the trough 1, the top film plate 7 supports the transparent support plate 6 and the gasket 4 located at one side of the transparent support plate 6 facing the release film 3, and the release film 3 is tensioned by pushing upward the release film 3. For convenience of illustration, the seal ring 2 is not shown in fig. 4.

Certainly this disclosed embodiment is not limited to adopt the top film board upwards to push up from the type membrane and realize the tensioning from the type membrane, also can be with the position already by the fixed from the type membrane of press mold board with the top film board position after aiming at, top film board position motionless, from the type membrane downstream to with the top film board after contact, continue the certain distance of downstream in order to realize from the tensioning of type membrane. The tensioning amount of the release film in this embodiment can be adjusted according to the thickness and area of the release film, and is not limited herein.

For example, the top diaphragm plate may be made of an aluminum alloy or structural steel.

For example, as shown in fig. 3A, the top membrane plate 7 further includes a ring of second fixing portions 720 located outside the annular protrusion 710, a surface of the second fixing portions 720 away from the transparent support plate 6 is parallel to the transparent support plate 6, and the surface may be a mounting surface of the material tank assembly. In the tensioning release film process, the transparent support plate is controlled to be parallel to the surface of the top film plate far away from the transparent support plate, and the release film can be controlled to be parallel to the mounting surface of the trough assembly.

For example, the second fixing portion 720 of the top film plate 7 may be provided with fixing holes corresponding to the second fasteners so that the top film plate is fixed at the second opening side of the chute by the second fasteners, for example, the second fixing portion of the top film plate may be fixed at the bottom of the ring frame of the chute to realize fixing the transparent support plate. For example, the second fasteners may be bolts, pins, etc. to achieve mutual connection and fastening.

Therefore, the trough assembly provides enough support for the release film 3, so that the release film 3 is in a better working state; in addition, a certain distance is formed between the release film 3 and the transparent support plate 6, and a certain space is formed, so that the release film can be matched with the air pressure supply device 20 to optimize the 3D printing process.

For example, in some embodiments, the air pressure supply device 20 further includes a pressure detection port 207, and at this time, a second air vent 611 (as a second air vent of the breathing chamber 6A) is provided on the transparent support plate 6, the pressure detection port 207 communicates to the breathing chamber 6A between the release film 3 and the transparent support plate 6 through the second air vent 611, and the first air vent 610 and the second air vent 611 are provided on opposite sides of the transparent support plate 6.

For example, as described above, the air pressure supply device 20 may be controlled to provide the positive pressure so that the release film 3 is not deformed or is slightly deformed in the direction of the transparent support plate 6, for example, if the deformation is slightly deformed, the amount of deformation of the release film 3 is maintained to be not more than 0.5mm, alternatively, not more than 0.3mm or not more than 0.15mm, so that the distance between the release film 3 and the transparent support plate 6 is maintained at 0.05mm-5 mm. At this time, the air pressure supply device 20 maintains the distance between the transparent support plate 6 and the release film 3, for example, by supplying sufficient air to the breathing chamber 6A between the transparent support plate 6 and the release film 3. In addition, the positive pressure can also prevent the release film 3 from generating a concave phenomenon.

For example, the air pressure supply device 20 can be controlled to provide positive pressure, so that the air pressure in the respiratory cavity is equal to or higher than the atmospheric pressure, and the absolute value of the deformation amount generated by the release film towards the transparent support plate is controlled to be not more than 0.5mm, which can be understood as follows: the distance between the release film and the transparent support plate is maintained to be 0.05mm-5mm, or the distance between the release film and the transparent support plate is maintained in a natural state, or the deformation quantity generated from the release film to the transparent support plate is controlled to be not more than 0.5mm, or the deformation quantity generated from the release film to the direction back to the transparent support plate is controlled to be not more than 0.5mm, or the purpose that the air pressure in the breathing cavity is higher than the atmospheric pressure is to counteract the gravity of the liquid material.

For example, the air pressure supply device 20 can also be controlled to provide negative pressure, so that the release film 3 deforms toward the transparent support plate 6, so as to reduce the distance between the release film 3 and the transparent support plate 6 or force the release film and the bonding part of the printing mold (i.e. the polymeric layer) to gradually separate from the edge toward the central area; meanwhile, the liquid material automatically flows and is filled to the area between the polymerization layer and the release film under the action of pressure. For example, the distance between the release film 3 and the transparent support plate 6 at the maximum deformation is reduced to be in the range of 0mm to 3 mm. In other words, the air pressure supply device 20 provides a negative pressure by, for example, drawing out air between the transparent support plate 6 and the release film 3. Therefore, the distance between the release film 3 and the supporting plate 6 is reduced, so that a polymeric layer formed by 3D printing can be separated from the release film 3 as soon as possible; in addition, the interval from type membrane 3 and backup pad 6 is reduced, increases from the distance between type membrane and the polymerization layer to multiplicable 3D printing material fills to the speed from between type membrane and the polymerization layer, and then accelerates 3D printing speed, improves 3D printing efficiency.

It should be noted that, in the description of the present disclosure, "positive pressure" refers to a state where the pressure on the controlled side of the air pressure device to be controlled is higher than or equal to the pressure on the opposite side, for example, higher than or equal to the pressure on the normal pressure (i.e., one standard atmospheric pressure) + the pressure state corresponding to the gravity of the printing material, "negative pressure" refers to a state where the pressure on the controlled side of the air pressure device to be controlled is lower than the pressure on the opposite side, for example, lower than the pressure on the normal pressure (i.e., one standard atmospheric pressure) + the pressure state corresponding to the gravity of the printing material, "supplying negative pressure or positive pressure to the air pressure device to be controlled" refers to making the air pressure device to be controlled in a negative pressure or positive pressure state.

For example, if the pressure of the breathing chamber is controlled, the controlled side of the device to be controlled may be the breathing chamber side, the opposite side is the side of the release film opposite to the breathing chamber, i.e. the side of the release film close to the forming platform, and the breathing chamber side is the side of the release film far from the forming platform, i.e. the opposite side is the side to be compared with the controlled side in terms of pressure.

For example, "supplying negative pressure to the air pressure device to be controlled" may be that the air pressure in the breathing chamber of the air pressure device to be controlled is 0.1KPa to 10KPa less than the normal pressure. The positive pressure may be provided by a pressure in a breathing cavity in the device to be controlled by air pressure equal to or slightly greater than standard atmospheric pressure, for example, a pressure value of about 0 to 0.1KPa greater than the standard atmospheric pressure.

For example, in some embodiments, the operation flow of the constant voltage mode of the 3D printing air pressure supply system 100 described above is as follows.

For example, the constant pressure mode of the 3D printing air pressure supply system 100 may be used during or before the curing process of 3D printing. The operation flow of this mode includes, for example: first, the control air pressure source 201 operates at a predetermined rotational speed value. For example, when the constant positive pressure mode is provided, the air passage switching device 204 communicates the air outlet 2012 with the second air port 203 and communicates the air inlet 2011 with the first air port 202, and the air pressure source 201 inputs air from the first air port 202 through the air inlet 2011 and outputs air to the second air port 203 through the air outlet 2012 to provide positive pressure to the space between the release film 3 and the support plate 6. For example, when the constant negative pressure mode is provided, the air passage switching device 204 communicates the air inlet 2011 with the second air port 203, communicates the air outlet 2012 with the first air port 202 (or the third air port 301), and the air pressure source 201 inputs air from the second air port 203 through the air inlet 2011 and outputs air from the first air port 202 (or the third air port 301) through the air outlet 2011 to provide negative pressure to the space between the release film 3 and the support plate 6.

Next, the rotation speed value of the air pressure source 201 is obtained, and whether the rotation speed value reaches a predetermined value is determined. If not, the rotation speed value of the air pressure source 201 is adjusted, and the air pressure source 201 is enabled to work according to the new rotation speed value. If so, the air pressure sensor is used for detecting the air pressure between the transparent support plate 6 and the release film 3 through the pressure detection port to obtain an air pressure detection result, and then whether the air pressure detection result reaches a preset air pressure value is judged (the preset air pressure value is measured according to the distance between the release film 3 and the support plate 6 in a positive pressure mode or a negative pressure mode, and the preset rotating speed value can be further determined). If not, the rotation speed value of the air pressure source 201 is adjusted, and the air pressure source 201 is enabled to work according to the new rotation speed value. If yes, the air pressure adjusting process is ended, so that the air pressure source 201 keeps the current working state until a new command is received.

By the above manner, accurate closed-loop control can be achieved, and a constant air pressure (which may be positive pressure or negative pressure) can be provided to the target space, which can be determined according to the tension degree, area, thickness, and the like of the release film 3, for example, the air pressure is about 0.1KPa to 10KPa, for example, 0.1KPa to 5KPa smaller than the standard atmospheric pressure. Providing a positive pressure may be a pressure in the breathing chamber that is no more than 0.1Kpa above normal atmospheric pressure, and may be, for example, a pressure value of about 0.01Kpa to 0.05Kpa or 0.05Kpa to 0.1Kpa, and providing a negative pressure may be a pressure value in the breathing chamber that is about 0.1Kpa to 5Kpa below normal atmospheric pressure. Above-mentioned mode is through providing the malleation in the photocuring stage, make can avoid being recessed because of the gravity action of liquid 3D printing material produces from the type membrane, can also provide the negative pressure and make to take place physical deformation from the type membrane when the shaping platform begins to promote after photocuring is accomplished, be favorable to from the type membrane and the separation before the cured polymerization layer, and make the increase of distance between type membrane and the polymerization layer, thereby multiplicable 3D printing material fills to the speed of from between type membrane and the polymerization layer, and then accelerate 3D printing speed, improve 3D printing efficiency.

For example, in some embodiments, the operation flow of the positive-negative pressure alternating mode (or referred to as an intermittent mode) of the 3D printing air pressure supply system 100 is as follows.

For example, the positive and negative pressure alternating mode of the 3D printing air pressure supply system 100 may be used throughout the 3D printing process. For example, after the 3D printing material is filled and before the photo-curing process is performed, the air path switching device 204 communicates the air outlet 2012 with the second air port 203 and communicates the air inlet 2011 with the first air port 202, the air pressure source 201 inputs air from the first air port 202 through the air inlet 2011 and outputs air to the second air port 203 through the air outlet 2012, so as to provide positive pressure to the space between the release film 3 and the support plate 6, and maintain the positive pressure in the breathing cavity during the photo-curing process. For example, during the process of moving the forming platform to the next forming position and providing negative pressure during the process of filling the 3D printing material, the air path switching device 204 communicates the air inlet 2011 with the second air port 203, communicates the air outlet 2012 with the first air port 202 (or the third air port 301), and the air pressure source 201 inputs air from the second air port 203 through the air inlet 2011 and outputs air from the first air port 202 (or the third air port 301) through the air outlet 2011 so as to provide negative pressure for the space between the release film 3 and the support plate 6. Thus, the 3D printing air pressure supply system 100 may be in the positive and negative pressure alternating mode as the 3D printing process proceeds.

For example, the operation flow of the positive and negative pressure alternating mode includes: first, the control air pressure source 201 operates at a predetermined rotational speed value. Then, the rotation speed value of the air pressure source 201 is obtained, and whether the rotation speed feedback value reaches a preset value is judged. If not, the rotation speed value of the air pressure source 201 is adjusted, and the air pressure source 201 is enabled to work according to the new rotation speed value. If so, the air pressure sensor is used for detecting the air pressure of the transparent support plate 6 and the release film 3 through the pressure detection port to obtain an air pressure detection result, and whether the air pressure detection result reaches a preset air pressure value is judged. If not, the rotation speed value of the air pressure source 201 is adjusted, and the air pressure source 201 is enabled to work according to the new rotation speed setting value. If yes, further judging whether the gas path switching device is needed to perform gas path switching (namely switching positive and negative pressure). If yes, the air path switching device 204 is controlled to switch the air path, and the air pressure source 201 is controlled to operate according to the new rotation speed value (or according to the current rotation speed value). If not, the air pressure adjusting process is ended, so that the air pressure source 201 keeps the current working state until a new instruction is received.

By the mode, accurate closed-loop control can be realized, and positive pressure and negative pressure can be alternately provided for a target space. From this, can be in the curing process that 3D printed, provide the malleation, keep from the interval between type membrane and the backup pad, avoid from the recessed phenomenon that type membrane arouses because of printing material gravity, and, be convenient for print the piece and break away from type membrane 3 in forming platform motion process and filling process, and increase the interval before from type membrane and polymerization layer, the 3D printing material of being convenient for is filled to the space from between type membrane and the polymerization layer, thereby promote printing speed.

At least one embodiment of the present disclosure provides a 3D printing system, as shown in fig. 7, the 3D printing system 1000 includes a forming platform 200, a lifting device 300, any one of the above 3D printing air pressure supply systems 100 (including the material tank assembly 10 and the air pressure supply device 20), and a light curing device 400. The molding platform 200 includes a molding surface 200A for forming a 3D object. For example, in some embodiments, the forming platform 200 is provided with a detachable base 200B, the surface of the base 200B is the forming surface 200A, and the 3D object can be directly formed on the forming surface 200A, so that after the 3D object is formed, the formed 3D object can be removed by detaching the base 200B from the forming platform 200, and then the subsequent operation can be performed.

The lifting device 300 is configured to drive the forming platform 200 in motion. For example, the lifting device 300 is connected to the forming platform 200 through the robot arm 200C to drive the forming platform 200 to move. For example, the lifting device 300 may drive the forming platform 200 to move in a vertical direction in fig. 1 to perform 3D printing to the bottom and up.

The 3D printing air pressure supply system 100 includes a chute assembly 10 and an air pressure supply device 20. The chute assembly 10 comprises an opening 101, a release film 3 and a transparent support plate 6, the opening 101 faces the molding surface 200A, and is configured to provide a material for forming a 3D object, such as a liquid 3D printing material, the release film 3 carries the liquid 3D printing material, and the release film 3 is spaced apart from the transparent support plate 6. The air pressure supply device 20 is configured to provide air pressure to the breathing cavity between the release film 3 and the transparent support plate 6, so as to control the distance between the release film 3 and the transparent support plate 6.

The light curing device 400 is configured to emit light to the molding area to cure the material between the release film 3 and the molding platform 200 and irradiated by the light, and form a polymeric layer on the molding surface 200A. For example, the molding area is determined according to the desired shape of each polymeric layer, and embodiments of the present disclosure are not particularly limited in this regard.

For example, in some embodiments, the light curing device 400 includes a light emitting panel (or referred to as a light engine), where the light emitting panel includes a plurality of pixel units arranged in an array, and the plurality of pixel units can be controlled to emit light in different areas. For example, the light emitting panel may include a plurality of light emitting regions each including one or more pixel units, so that by controlling light emission of the plurality of light emitting regions, light can be precisely provided to the molding region, thereby making the light range more accurate. For example, the light curing device 400 may be disposed on the side of the chute assembly 10 away from the shaping platform 200 via the light engine support 400A.

For example, according to the difference of the liquid 3D printing material, the plurality of pixel units may emit light in different forms such as visible light, infrared light, or ultraviolet light, which is not specifically limited in this disclosure. For example, in some examples, the plurality of pixel cells may emit ultraviolet light having a wavelength in a range, such as a wavelength range of 350 and 410 nm. Also, the specific wavelength of the light may be selected according to the kind of the liquid 3D printing material, i.e. the light more suitable for curing the used liquid 3D printing material is selected. For example, in some examples, the light employed is ultraviolet light having a wavelength of 405 nm.

For example, in some embodiments, the air pressure supply device 20 controls the distance between the release film 3 and the transparent support plate 6 through the output or input of air.

For example, in some embodiments, the pressure supply device 20 is configured to provide positive pressure to the breathing chamber 6A between the release film 3 and the transparent support plate 6 before or while the light curing device 400 performs the curing operation, so as to maintain or control the distance between the release film 3 and the transparent support plate 6, and make the pressure in the breathing chamber equal to or greater than the normal pressure. For example, the positive pressure supplied to the breathing cavity 6A between the release film 3 and the transparent support plate 6 can maintain the distance between the release film 3 and the transparent support plate 6 to be 0.05mm-5 mm; in addition, the positive pressure can be provided to avoid the phenomenon of sinking of the release film 3.

For example, in some embodiments, the pressure supply device 20 is further configured to provide a negative pressure to the breathing cavity 6A between the release film 3 and the transparent support plate 6 before, simultaneously with, or after the lifting device 300 drives the forming platform 200 to move in a direction away from the release film 3, so as to reduce the distance between the release film 3 and the transparent support plate 6, for example, to reduce the distance between the release film 3 and the transparent support plate 6 at the maximum deformation to 0-3 mm. Thereby facilitating the detachment of the polymeric layer from the release film 3 and facilitating the rapid filling of the 3D printing material into the space between the release film 3 and the polymeric layer for forming the next polymeric layer.

For example, in some embodiments, the 3D printing system can further include a material monitoring device disposed on the chute assembly that can be configured to monitor the filling of the liquid 3D printing material between the forming platform and the release film. Furthermore, the material monitoring device may also be configured to monitor a level of the liquid 3D printed material in the chute assembly. Specifically, for example, in some embodiments, the material monitoring device may be used to monitor the liquid filling condition between the molding surface 200A of the molding platform 200 and the release film 3, and when the material is monitored to be insufficiently filled, the material monitoring device continues to wait for a period of time, and after the material filling is completed, the next operation is performed. The embodiment of the present disclosure does not limit the kind of the material monitoring device as long as the corresponding function can be realized. For example, in some examples, the material monitoring device may employ an optical detection device that can obtain information on the liquid filling state using a change in light after the light passes through the space between the molding surface 200A and the release film 3.

For example, the material monitoring device may also monitor the liquid level of the liquid 3D printing material in the trough assembly 20, and when the liquid level of the liquid 3D printing material is lower than a predetermined liquid level, the amount of the liquid 3D printing material in the trough assembly 20 is insufficient, and at this time, the liquid 3D printing material may be added to the trough assembly 20, so that the liquid level of the liquid 3D printing material in the trough assembly 20 is within a predetermined range, so as to meet the requirement of 3D printing.

At least one embodiment of the present disclosure further provides a method for performing 3D printing by using any one of the above-mentioned 3D printing systems, as shown in fig. 8, the 3D printing method may include steps S101 to S108.

Step S101: drive the shaping platform to the initial forming position, the shaping platform with from forming the shaping region between the type membrane, be located the silo subassembly from the type membrane.

For example, referring to fig. 1, in the beginning stage of printing, the lifting device 300 may be used to drive the forming platform 200 to move downward, for example, so that the forming platform 200 is located at the initial forming position, and until printing is completed in the subsequent printing stage, the driving of the forming platform to the forming position may be performed by the lifting device driving the forming platform to move away from the release film, so that the forming platform is located at the next forming position. At this time, the molding surface 200A is located in the liquid 3D printing material in the feeding assembly 10, a molding region is formed between the molding platform and the release film, and the release film is located in the feeding assembly, for example, a distance between the molding surface 200A and the release film 3 (i.e., a height of the molding region) is 10 micrometers to 950 micrometers, for example, 100 micrometers, 300 micrometers, or 500 micrometers.

For example, in some embodiments, driving the forming platform 200 to the initial position comprises: the molding platform 200 is driven to move toward the release film 3 so that the molding platform 200 is located at the initial molding position. For example, after the forming platform 200 is located at the initial forming position, the distance between the forming surface 200A and the release film 3 is 10 micrometers to 950 micrometers, such as 100 micrometers, 300 micrometers, or 500 micrometers.

For example, the driving forming platform 200 may be moved in a straight line at a constant speed or in a specified motion track and speed, and the motion may be continuous or intermittent. For example, forming tables200 can be driven to move in a straight line at a uniform speed of 1-500 microns/S or in a parabolic, uniformly accelerated motion, for example at 1 micron/S²-2000 μm/S²With an acceleration of 0 as an initial velocity, or with a uniform deceleration along a straight line, e.g. at 1 μm/S²-2000 μm/S²The acceleration of the moving object is uniform deceleration movement with the initial speed of 10-1000 microns/s.

For example, in the printing start stage, before step S101, the 3D printing method may further include a step of adding liquid 3D printing material in the chute assembly 10, and then may not include the adding step if the 3D printing material is sufficient, and may include the adding step if the 3D printing material is not sufficient. For example, the liquid 3D printed material may comprise a single component or multiple components (e.g., two or three components, etc.). When the liquid 3D printing material includes multiple components, the multiple components may be mixed by a mixer and added to the chute assembly 10.

For example, referring to fig. 1, after the forming platform 200 is located at the forming position, a space between the forming surface 200A of the forming platform 200 and the release film 3 needs to be filled with the liquid 3D printing material for curing and forming.

For example, the filling of the 3D printing material may be performed simultaneously with the movement (or movement) of the forming platform, that is, in the beginning stage of printing, since the forming platform moves towards the release film, the filling is performed simultaneously, and the filling process is completed when the forming platform moves; and in the subsequent printing stage, the forming platform moves towards the direction far away from the release film, the filling of the 3D printing material is simultaneously carried out while the forming platform moves, the duration time of the filling process exceeds the movement of the forming platform, namely, the filling of the 3D printing material is finished after the forming platform moves, or the filling of the 3D printing material and the movement of the forming platform are simultaneously finished, and the filling and the movement are determined according to the material properties of the 3D printing material and the like.

For example, in some embodiments, the material monitoring device may be used to monitor the liquid filling condition between the molding surface 200A of the molding platform 200 and the release film 3, and when the material is monitored to be insufficiently filled, the material monitoring device continues to wait for a period of time, and after the material filling is completed, the next operation is performed. The embodiment of the present disclosure does not limit the kind of the material monitoring device as long as the corresponding function can be realized. For example, in some examples, the material monitoring device may employ an optical detection device that can obtain information on the liquid filling state using a change in light after the light passes through the space between the molding surface 200A and the release film 3.

Step S102: and controlling the release film to be in a first state so as to keep the molding surface of the molding platform and the thickness of the printing material between the release film.

For example, the release film in the first state is: the absolute value of the deformation quantity generated by the release film in the first state is not more than 0.5mm by taking the straight tensioning state of the release film as a reference, namely, the deformation quantity at any point is not more than 0.5mm, and the relative displacement of any point relative to the point in the straight tensioning state is not more than 0.5 mm. Optionally, the release film in the first state is: and taking the flat tensioning state of the release film as a reference, wherein the absolute value of the deformation quantity generated by the release film in the first state is not more than 0.3mm, or not more than 0.15 mm.

For example, the first state of the release film may be a state when the release film is under atmospheric pressure, or the first state may be a state when the pressure of the side of the release film away from the forming platform is greater than the pressure of the side of the release film close to the forming platform, or the first state may be a state when the pressure of the side of the release film away from the forming platform is less than the pressure of the side of the release film close to the forming platform.

For example, the release film is in the first state by controlling the magnitude relationship between the pressure of the release film on the side far away from the forming platform and the pressure of the release film on the side close to the forming platform.

For example, in some embodiments, a breathing cavity is arranged on one side of the release film close to the forming platform, and the pressure of the breathing cavity is adjustable through the light-transmitting fluid; or a breathing cavity is arranged on one side of the release film, which is far away from the forming platform, and the pressure intensity of the breathing cavity is adjustable through the light-transmitting fluid; for example, the light-transmissive fluid includes a light-transmissive gas and/or a light-transmissive liquid.

At the moment, positive pressure is provided for the breathing cavity on one side far away from the forming platform, so that the release film is in a first state; or the release film is in the first state by providing negative pressure for the breathing cavity close to one side of the forming platform.

For example, in some examples, the side of the release film away from the forming platform has a transparent support plate, the release film and the transparent support plate form a breathing cavity, at this time, the air pressure supply device 20 may be used to provide positive pressure to the breathing cavity between the release film and the transparent support plate to maintain or control the distance between the release film 3 and the transparent support plate 6, so that the release film is in a first state, the distance between the release film and the transparent support plate is 0.05mm-5mm, thereby maintaining the thickness of the material between the forming platform and the release film, and further during the light curing process, the part of the material may form a polymerization layer.

For example, the air pressure supply device 20 can provide positive pressure to the breathing cavity between the release film 3 and the transparent support plate 6 to maintain the breathing cavity between the release film 3 and the transparent support plate 6 at or above atmospheric pressure, for example, slightly above a standard atmospheric pressure, for example, 0-0.1Kpa above a standard atmospheric pressure.

Aforesaid for atmospheric pressure in the breathing chamber is equal to atmospheric pressure or is higher than atmospheric pressure, and then the absolute value of the deformation volume of control type membrane to transparent support plate direction production is not more than 0.5mm, can understand: the distance between the release film and the transparent support plate is maintained to be 0.05mm-5mm, or the distance between the release film and the transparent support plate is maintained in a straight tensioning state, or the deformation quantity generated from the release film to the transparent support plate is controlled to be not more than 0.5mm, or the deformation quantity generated from the release film to the direction opposite to the transparent support plate is controlled to be not more than 0.5mm, or the purpose that the air pressure in the breathing cavity is higher than the atmospheric pressure is to counteract the gravity of the liquid material.

Step S103: light is provided to illuminate a molding area to cure the material illuminated by the light and located between the molding platform and the release film and form a polymeric layer on the molding surface.

For example, the light curing device 400 is used to provide light to irradiate the molding area, so as to cure the liquid 3D printing material irradiated by the light and located between the molding platform 200 and the release film 3, and form a polymerization layer on the molding surface 200A. For example, in some examples, the light curing device 400 may emit light in the wavelength range of 350-410 nm. The wavelength of the light may be selected according to the kind of the liquid 3D printing material, and embodiments of the present disclosure are not particularly limited thereto. For example, in some examples, the light employed is ultraviolet light having a wavelength of 405 nm.

For example, the light provided by the light curing device 400 may be continuous or intermittent, and the specific form of providing the light by the light curing device 400 is not limited by the embodiments of the disclosure.

Step S104: and controlling the release film to deform towards the direction far away from the forming platform, so that the polymerization layer and the release film are gradually separated from the periphery of the contact surface to the center, and meanwhile, the printing material is gradually filled along the separation gap.

For example, the release film is controlled to deform in a direction away from the forming platform, and the distance between the forming surface of the forming platform and the release film is increased. Therefore, the separation of the formed polymerization layer and the release film can be facilitated, for example, the polymerization layer and the release film are gradually separated from the edge part to the middle part, the printing material is enabled to flow back and is filled into the area between the polymerization layer and the release film, the formation of the next polymerization layer can be further facilitated, the backflow speed of the printing material is further improved, and the printing process is accelerated.

For example, in some embodiments, in the process of controlling the deformation of the release film in the direction away from the forming platform, the absolute value of the deformation amount at the maximum deformation position of the release film in the direction away from the forming platform is greater than 0.1mm based on the release film in the first state. Therefore, the bonding part of the release film and the polymeric layer (namely the printing model) can be fully forced to be gradually separated from the edge to the central area, so that the polymeric layer is gradually separated from the release film, and the material automatically flows and is gradually filled into the area between the polymeric layer and the release film under the action of pressure.

Here, it should be noted that the first state can be referred to the front part of the specification, and refers to a state where the absolute value of the amount of deformation generated by the release film is not more than 0.5 mm; and, the "amount of deformation" means that the distance of the same point in a direction perpendicular to the surface of the release film is changed with respect to the release film in an undeformed state (or a straight tensioned state) or a release film of a specified reference. For example, the amount of deformation in the first state refers to a change in position of the release film with respect to an undeformed state, for example, a flat tensioned state, and the amount of deformation in step S104 is a change in position with respect to the first state as a reference, that is, a change in position with respect to the first state.

For example, there are various methods for controlling the deformation of the release film in the direction away from the forming platform, and the embodiment of the disclosure is not limited thereto. For example, in some embodiments, controlling the deformation of the release film in a direction away from the forming platform may include: the method comprises the steps that the size relation between the pressure intensity of the release film far away from one side of a forming platform and the pressure intensity of the release film near the forming platform is controlled, so that the release film deforms towards the direction far away from the forming platform, for example, the pressure intensity of the release film far away from the forming platform is controlled to be smaller than the pressure intensity of the release film near the forming platform; or applying external force to the release film to enable the release film to deform in the direction away from the forming platform; or the driving release film moves towards the direction far away from the forming platform, so that the release film deforms towards the direction far away from the forming platform, and the like. Embodiments of the present disclosure include, but are not limited to, this as long as the release film can be deformed in a direction away from the molding platform.

For example, a breathing cavity is arranged on one side of the release film close to the forming platform, and the pressure of the breathing cavity is adjustable through the light-transmitting fluid; or keep away from of type membrane shaping platform one side is provided with respiratory cavity, respiratory cavity's pressure is adjustable through light transmissivity fluid. For example, the light-transmissive fluid may be a light-transmissive gas and/or a light-transmissive liquid. The breathing cavity is a closed space with certain sealing performance. For example, controlling the pressure of the side of the release film far away from the forming platform to be lower than the pressure of the side of the release film near the forming platform includes: a breathing cavity is arranged on one side of the release film, which is far away from the forming platform, and negative pressure is provided for the breathing cavity so that the release film deforms towards the direction far away from the forming platform; or, in other embodiments, set up respiratory cavity in the one side of being close to the shaping platform from the type membrane, through providing the malleation for respiratory cavity so that take place the deformation to the direction of keeping away from the shaping platform from the type membrane.

For example, a breathing cavity is arranged on one side of the release film, which is far away from the forming platform, and a transparent support plate can be arranged on one side of the release film, which is far away from the forming platform, under the condition that the breathing cavity is provided with negative pressure so that the release film deforms in the direction far away from the forming platform, so that the breathing cavity is formed by the release film and the transparent support plate; then, through providing the negative pressure to the breathing cavity between leaving type membrane and the transparent support plate to make from type membrane to transparent support plate orientation emergence deformation.

For example, providing negative pressure to the breathing cavity between the release film and the transparent support plate may include: the breathing chamber is made negative by outputting the gas in the breathing chamber, for example, by outputting the gas through the gas pressure supply system in the above embodiment; or the liquid in the breathing cavity is reduced by outputting the light-transmitting liquid in the breathing cavity so as to provide negative pressure for the breathing cavity, and the liquid amount in the breathing cavity is less than the liquid amount in the first state, namely the release film is not deformed or the absolute value of deformation is less than 0.5mm, so that the negative pressure is provided for the breathing cavity.

For example, in some embodiments, a light transmissive fluid supply device may be employed to provide positive or negative pressure to the breathing chamber between the release film and the transparent support plate. For example, the light-transmissive fluid supply device may be configured to supply positive pressure or negative pressure to the breathing chamber by inputting or outputting a light-transmissive fluid, such as a light-transmissive gas or a light-transmissive liquid, to the breathing chamber between the release film and the transparent support plate. For example, the light transmissive fluid supply device may be an air pressure supply device that supplies positive or negative pressure to the breathing chamber by inputting or outputting air to the breathing chamber between the release film and the transparent support plate.

For example, in some embodiments, the negative pressure provided to the breathing cavity between the release film and the transparent support plate is 0.1KPa-10KPa less than the atmospheric pressure, thereby forcing the release film to deform in a direction away from the forming platform.

For example, a breathing cavity is arranged on one side of the release film close to the forming platform, and a positive pressure is provided for the breathing cavity so that the release film deforms in a direction away from the forming platform, a closed printing chamber can be formed on one side of the release film close to the forming platform, and the printing chamber comprises a lifting device, the forming platform, a trough assembly and other structures; then, positive pressure is provided in the sealed printing chamber, so that the release film deforms in the direction away from the forming platform.

For example, in some embodiments, the positive pressure provided to the sealed printing chamber is greater than atmospheric pressure by 0.1KPa to 10KPa, thereby forcing the release film to deform away from the forming table.

For example, when the release film is deformed in a direction away from the forming platform or is in the first state by applying external force to the release film, the moving member may be disposed at the release film, and external force is applied to the release film by controlling the moving member, so that the release film is deformed in a direction away from the forming platform. For example, the moving member may be any type of mechanical member that can apply a force to the release film, and the mechanical member may be, for example, a flat plate, a press block, or the like, which is not limited in this respect by the embodiments of the present disclosure.

For example, in some embodiments, the chute assembly comprises a chute comprising an annular frame enclosing a first opening and a second opening opposite one another; set up from the type membrane ring frame's second opening side and cover the second opening be provided with the moving member from type membrane department, this moving member structure is for can driving from the type membrane reciprocates, at this moment, through to exert external force from the type membrane makes from the type membrane to keeping away from the direction of shaping platform and taking place deformation or be in the first state includes: the moving piece is moved to enable the release film to deform towards the direction far away from the forming platform or to be in the first state.

For example, the moving member includes the briquetting that is located from type membrane top and is located from the absorption piece of type membrane below, the absorption piece can drive the briquetting reciprocates, optionally, briquetting and absorption piece set up be located second open-ended border region department from the type membrane, for example, the briquetting is made by magnetic induction material, and the absorption piece is permanent magnetic material.

For example, when the release film is deformed in a direction away from the forming platform or is in the first state by applying external force to the release film, the chute assembly is movable, and when external force is applied to the release film, the release film is deformed in the direction away from the forming platform or is in the first state, the deformation includes: through reciprocating the silo subassembly makes from the type membrane to the direction of keeping away from the shaping platform deformation or be in the first state.

For example, in some embodiments, when the distance between the release film and the transparent support plate is 0.05mm to 5mm before the release film is deformed or when the release film is in the first state, the distance between the release film and the transparent support plate at the maximum deformation position is reduced to 0 to 3mm after the release film is deformed toward the transparent support plate. At this moment, the deflection from the type membrane reaches and forces the polymeric layer with from the separation of type membrane to and promote the backward flow speed of printing material, when accelerating the printing process, can also maintain self integrality, prevent to suffer the damage from the type membrane because of receiving too big pulling force, and then the extension is from the life of type membrane.

Step S105: and driving the forming platform to the next forming position.

For example, driving the forming table to move to the next forming position includes: the forming table is driven to move by a displacement equal to the thickness of each polymeric layer. For example, each polymeric layer may have a thickness of 10 microns to 950 microns, such as 100 microns, 300 microns, or 500 microns, and so on, as embodiments of the present disclosure are not limited in this respect.

For example, in some embodiments, driving the forming table to move a displacement equal to the thickness of each polymeric layer comprises: drive forming platform removes first distance to the direction of keeping away from type membrane for forming platform is located the intermediate position, then drives forming platform and removes the second distance from type membrane from the intermediate position orientation, makes forming platform be located next shaping position, and wherein, first distance is greater than the second distance, and the difference between first distance and the second distance equals the thickness on every layer of polymerization layer. At this moment, forming platform reciprocating motion, 3D print the mode and print the mode for shaking, and this mode helps printing material's backward flow and packing, and then accelerates printing material's backward flow and filling speed, compares with conventional forming platform reciprocating motion, through increasing forming platform and from the distance between the type membrane and accelerated printing material's backward flow in this disclosure, has promoted 3D printing speed.

For example, in other embodiments, driving the forming table to move a displacement equal to the thickness of each polymeric layer may include: and driving the forming platform to move towards the direction far away from the release film by a distance equal to the thickness of each polymerization layer. At this moment, the shaping platform is progressively to keeping away from the direction motion of type membrane, and 3D prints the mode for printing the mode in succession, and this mode can improve 3D printing speed, avoids shaking the time waste that the shaping platform brought, and then improves 3D and prints efficiency.

For example, in some embodiments, the forming platform is driven to move in a direction away from the release film or in a direction close to the release film, and the uniform motion or uniform acceleration motion can be adopted, for example, when the uniform motion is adopted, the speed of the uniform motion can be 1 micron/s-500 microns/s. For example, when using uniform acceleration motion, the initial velocity of the uniform acceleration motion is 0 and the acceleration can be 1 micron/S²-2000 μm/S². For example, as described aboveThe movement may be along a straight line or along a designated movement track, and the movement form of the forming platform 200 according to the embodiment of the disclosure is not particularly limited.

For example, in some embodiments, the deformation of the release film in the direction away from the forming platform is controlled before, simultaneously with, or after the forming platform is driven to move to the next forming position.

For example, in some embodiments, driving the forming platform to move to the next forming position and filling the material between the forming surface of the forming platform and the release film may be performed simultaneously; the printing material can flow back and be filled between the molding surface of the molding platform and the release film while the molding platform is driven to move to the next molding position, but the filling of the printing material can last longer than the movement of the molding platform according to the situation; or the forming platform is driven to move to the next forming position and the material is filled between the forming surface of the forming platform and the release film at the same time, when the forming platform is driven to move to the next forming position, the filling of the printing material is not completed, and the filling of the material lasts for a longer time than the movement of the forming platform.

For example, in some embodiments, the printing material is filled while the release film is gradually separated from the polymeric layer on the molding surface, the release film is controlled to deform in a direction away from the molding platform, so that the polymeric layer is gradually separated from the release film from the periphery of the contact surface to the center, and the printing material automatically flows and gradually fills along the separation gap between the polymeric layer and the release film under the pressure, that is, fills the separation gap between the polymeric layer and the release film.

Step S106: the release film is restored to the first state.

For example, after the printing material is completely filled, the release film is restored to the first state, so that the release film is prevented from being excessively recessed, and the printing material is cured and the next polymerization layer is formed. As described above, the first state of the release film may be: the absolute value of the deformation amount generated by the release film in the first state is not more than 0.5mm by taking the straight tensioning state of the release film as a reference, for example, the state of the release film when the release film is in atmospheric pressure, or the state of the release film when the pressure intensity of the release film far away from one side of the forming platform is greater than the pressure intensity of the release film near one side of the forming platform, or the state of the release film when the pressure intensity of the release film far away from one side of the forming platform is less than the pressure intensity of the release film near one side of the forming platform. For example, the state of the release film when the air pressure of the side of the release film far away from the forming platform is greater than the air pressure of the side of the release film near the forming platform, or the pressure of the side of the release film far away from the forming platform is greater than the pressure of the side of the release film near the forming platform by inputting the translucent liquid of the side of the release film far away from the forming platform, so as to recover the release film to the first state.

For example, the release film in the first state produces an absolute value of the amount of deformation of not more than 0.5 mm. At this moment, the release film is in a basically straight state, so that the thickness of the printing material between the forming surface of the forming platform and the release film is stable, and a polymerization layer with uniform thickness is formed.

For example, there are various ways to control the release film to be in the first state, and the embodiment of the disclosure is not limited thereto. For example, in some embodiments, the side of the release film remote from the forming platform has a breathing cavity, and the release film is in the first state by providing positive pressure to the breathing cavity; or in other embodiments, a breathing cavity is arranged on one side of the release film close to the forming platform, and negative pressure is provided for the breathing cavity so that the release film is in the first state.

For example, in the case that the side of the release film away from the forming platform has a breathing cavity, the side of the release film away from the forming platform is provided with a transparent support plate, and the release film and the transparent support plate form the breathing cavity. For example, in some embodiments, the distance between the release film and the transparent support plate is 0.05mm to 5mm in the first state.

For example, in some embodiments, the first state is maintained by supplying positive pressure to a breathing chamber formed by the release film and the transparent support plate, so that when the release film is in the first state, the air pressure supplied to the breathing chamber is equal to or higher than atmospheric pressure or translucent liquid is supplied to the breathing chamber. For example, above atmospheric pressure is no more than 0.1Kpa above atmospheric pressure. This atmospheric pressure can offset the gravity of the printing material who bears from the type membrane, and then avoids producing recessed phenomenon from the type membrane.

The light transmissive liquid is a neutral liquid, such as water, that does not affect any of the components of the printing system.

For example, in the case that a breathing cavity is arranged on one side of the release film close to the forming platform, a closed printing chamber is formed on one side of the release film close to the forming platform, and the printing chamber comprises structures such as a lifting device, the forming platform, a trough assembly and the like; then, the release film is in the first state by supplying negative pressure into the sealed printing chamber.

For example, in some embodiments, the negative pressure provided to the sealed printing chamber is 0.1KPa to 10KPa less than the atmospheric pressure when the release film is in the first state by providing the negative pressure to the sealed printing chamber.

For example, in some embodiments, the step of controlling the deformation of the release film in the direction away from the forming platform and the step of controlling the deformation of the release film in the first state may be implemented by using the same device, where a breathing cavity is disposed on one side of the release film close to the forming platform and a sealed printing chamber is formed on one side of the release film close to the forming platform, and negative pressure is provided to the sealed printing chamber to make the release film in the first state, and positive pressure is provided to the sealed printing chamber to make the deformation of the release film in the direction away from the forming platform. Or, can be that one side of keeping away from the shaping platform from the type membrane has respiratory cavity and is provided with transparent backup pad from one side of keeping away from the shaping platform of type membrane, through providing the malleation to respiratory cavity to the messenger is in first state from the type membrane, through providing the negative pressure to respiratory cavity, and makes to take place deformation to the direction of keeping away from the shaping platform from the type membrane.

Alternatively, in some embodiments, the above two implementations may be mixed, by providing negative pressure to the sealed printing chamber to make the release film in the first state, and by providing negative pressure to the breathing cavity to make the release film deform in a direction away from the forming platform; or, can be through providing the positive pressure to respiratory cavity to make from type membrane in first state, can be through providing the positive pressure to airtight printing chamber, and make from type membrane to keeping away from the direction of shaping platform and take place deformation, this embodiment of this disclosure does not restrict to this.

Step S107: light is provided to illuminate the molding area to cure the photo-irradiated printing material between the molding platform and the release film and form a next polymeric layer on the molding surface.

For example, a light curing device may be used to provide light to illuminate the molding area, thereby curing the light-illuminated printing material between the molding platform and the release film and forming a polymeric layer on the molding surface. The process is substantially the same as step S103, and is not described herein again.

Step S108: at least one next polymeric layer is formed on the molding surface.

For example, a shaped 3D printed object may be formed by repeating the above steps, e.g., repeating steps S104-S107 at least once, to form multiple polymeric layers on the molding surface.

It should be noted that, in the embodiment of the present disclosure, the above steps S101 to S108 are only used to illustrate operations performed by the steps, and are not used to limit the execution order of the steps S101 to S108, that is, the steps S101 to S108 may be performed sequentially, may be performed partially simultaneously, or may be performed in a sequence.

For example, in some embodiments, the 3D printing process by the 3D printing method can be performed by using the 3D printing system shown in fig. 7 and the 3D printing air pressure supply system described above, and the air pressure supply device is used to provide pressure to the breathing cavity between the release film and the transparent support plate, so as to control the state of the release film.

For example, when the 3D printing system shown in fig. 7 is used and the 3D printing method is used to perform 3D printing, after the last photocuring step is completed and the forming platform has moved to the next forming position and the material is filled, the electrical controller of the air pressure supply device 20 controls the output pressure of the air pressure source to gradually decrease, and at the same time, reverses the air flow introduced into the breathing cavity, i.e., provides positive pressure to the breathing cavity, until the pressure of the breathing cavity is equal to or slightly greater than the standard atmospheric pressure (normal pressure) (slightly greater than the atmospheric pressure in order to counteract the gravity of the liquid material), and the air pressure source stops working.

For example, in some embodiments, during the process of providing light to illuminate the molding area, the air pressure source 201 of the air pressure supply device 20 is deactivated to maintain the air pressure in the breathing cavity 6A at or above atmospheric pressure, e.g., slightly above atmospheric pressure, e.g., 0-0.1Kpa above atmospheric pressure. At this time, as shown in fig. 9, the air pressure in the breathing chamber 6A can counteract the gravity generated by the liquid 3D printing material 100A in the trough, so that the release film 3 and the transparent support plate 6 can both maintain a substantially flat state, for example, the release film 3 and the transparent support plate 6 are parallel to each other, and the distance between the two can be 0.5mm-5 mm. Thereby, the thickness of the liquid 3D printing material 100A between the release film 3 and the molding stage is stabilized, and the polymeric layer 100B can be formed by photocuring.

For example, at least one embodiment of the present disclosure provides a method, after forming a polymer layer, before or while driving the forming platform to move away from the release film, the printing method further includes: utilize atmospheric pressure feeding device to provide the negative pressure for the respiratory cavity from between type membrane and the transparent support plate to make take place to deform from the direction of type membrane to the transparent support plate, and then make polymerization layer 100B progressively with break away from type membrane.

For example, when negative pressure is provided to the breathing cavity between the release film and the transparent support plate, the release film deforms in the direction of the transparent support plate, so that the bonded part of the release film and the polymeric layer (i.e. the printing model) is gradually separated from the edge to the central area, and the polymeric layer is gradually separated from the release film, so that the material automatically flows and gradually fills the area between the polymeric layer and the release film under the pressure action.

For example, during the movement of the forming platform in the direction away from the release film, the air pressure source 201 of the air pressure supply device 20 is activated to provide negative pressure to the breathing cavity 6A, the pressure sensor 208 monitors the pressure in the breathing cavity 6A and feeds the pressure back to the controller 213, and at this time, the negative pressure in the breathing cavity 6A is gradually increased. For example, the negative pressure in the breathing chamber 6A is gradually and smoothly increased to avoid the polymeric layer 100B from being subjected to excessive tension and damage to the release film 3.

For example, the magnitude of the negative pressure provided is 0.1KPa to 10KPa less than atmospheric pressure, and even greater. For example, the magnitude of the negative pressure may be determined according to the size of the space between the release film 3 and the transparent support plate 6, for example, in one example, when the space between the release film 3 and the transparent support plate 6 is 0.3mm, the magnitude of the negative pressure may be 10KPa less than the atmospheric pressure; for example, when the distance between the release film 3 and the transparent support plate 6 is large, it is not desirable to apply an excessive negative pressure in order to protect the life of the release film 3.

It should be noted that the distance between the release film and the transparent support plate refers to the distance between the corresponding points in the direction perpendicular to the molding surface of the molding platform, for example, in the vertical direction.

For example, the release film 3 is subjected to negative pressure, and may exhibit the deformation shown in fig. 10, in which the release film 3 and the polymeric layer 100B are gradually separated from the edge to the central region; meanwhile, the liquid 3D printing material 100A automatically flows and fills to the region where the polymeric layer 100B and the release film 3 are separated under the pressure.

For example, after the negative pressure reaches a certain value, as shown in fig. 11, the release film 3 and the polymeric layer 100B are completely separated, and the release film 3 is subjected to pressure to assume the deformed state shown in fig. 11, and at this time, the 3D printing material can be sufficiently filled between the release film 3 and the polymeric layer 100B. For example, in the process of gradually separating the release film 3 from the polymeric layer 100B, the 3D printing material can be gradually filled between the release film 3 and the polymeric layer 100B.

For example, in some embodiments, when the release film 3 and the transparent support plate 6 are in a substantially flat state, in the case where the distance between the release film 3 and the transparent support plate 6 is 0.05mm to 5mm, supplying negative pressure to the breathing chamber between the release film 3 and the transparent support plate 6 may enable the distance between the release film 3 and the transparent support plate 6 at the maximum deformation to be reduced to 0 to 3mm, i.e., in the case shown in fig. 11, the distance between the release film 3 and the transparent support plate 6 at the maximum deformation to be reduced to 0 to 3 mm. For example, in some examples, when the distance between the release film 3 and the transparent support plate 6 is 0.05mm when the release film 3 and the transparent support plate 6 are in a substantially flat state, the distance between the release film 3 and the transparent support plate 6 at the maximum deformation may be reduced to 0; when the distance between the release film 3 and the transparent support plate 6 is 3mm, the distance between the release film 3 and the transparent support plate 6 at the maximum deformation position can be reduced to 1 mm; when the interval between the release film 3 and the transparent support plate 6 is 5mm, the interval between the release film 3 and the transparent support plate 6 at the maximum deformation may be reduced to 3 mm.

For example, in some embodiments, after filling the material between the forming surface of the forming table and the release film, or after the forming surface has formed the polymeric layer thereon and the material is filled between the polymeric layer and the release film, the printing method further comprises: providing positive pressure to the breathing cavity between the release film and the transparent support plate, so that the air pressure in the breathing cavity is equal to or higher than the atmospheric pressure, and then restoring the release film to the first state, for example, maintaining the distance between the release film and the transparent support plate to be 0.05mm-5mm, or maintaining the distance between the release film and the transparent support plate in a straight and tensioned state, or offsetting the gravity of the material, as shown in fig. 12. Then, a curing process is performed using a photo-curing device to form the next polymerization layer.

For example, in some embodiments, a positive pressure is provided to the breathing cavity between the release film and the transparent support plate, so that when the air pressure in the breathing cavity is equal to or higher than the atmospheric pressure, the release film does not deform, or only slightly deforms, for example, the amount of deformation of the release film in the direction toward the transparent support plate is not greater than 0.5 mm.

For example, in some embodiments, when the breathing chamber between the release film and the transparent support plate provides negative pressure, providing negative pressure comprises: providing negative pressure at a constant speed, a uniform acceleration or a uniform deceleration so as to enable the negative pressure to reach a set value; when providing the malleation from the respiratory cavity between type membrane and the transparent support plate, provide the malleation and include: the positive pressure is provided at a constant speed, at a uniform acceleration or at a uniform deceleration so as to reach a set value. From this, atmospheric pressure feeding device 20 can provide pressure for the breathing chamber between type membrane and the transparent support board steadily to avoid the sudden change of pressure to cause from the type membrane damage or shorten from the type membrane life-span, and prevent to produce too big pulling force to the polymerization layer.

For example, drive forming platform to keeping away from the direction motion of type membrane and at forming platform's shaping surface and from filling material can be going on simultaneously between the type membrane, drive forming platform is to keeping away from the in-process of the direction motion of type membrane promptly, the material can be filled forming platform's shaping surface and from between the type membrane, and because pressure supply device 20 provides the negative pressure to the breathing chamber from between type membrane and the transparent support plate this moment, consequently forming platform's shaping surface and from interval increase between the type membrane, and then help the material to fill fast to the breathing chamber from between type membrane and the transparent support plate, 3D printing speed can be improved from this.

It can be seen that in the above-mentioned 3D printing method provided in the embodiment of the present disclosure, the effects of separating the polymeric layer from the release film and sufficiently filling the material can be achieved simultaneously by providing negative pressure to the breathing cavity between the release film and the transparent support plate, so that continuous printing can be achieved without completing the material filling through the reciprocating motion and waiting time of the forming platform, and thus the 3D printing speed is increased. For example, the above method can more effectively exhibit the nondestructive separation of the polymeric layer from the release film when the contact area between the polymeric layer and the release film is large. In addition, the printing method can adopt any form of release film such as non-oxygen permeable film or oxygen-resistant release film to realize printing, thereby widening the application range of the release film and reducing the cost.

According to the scheme disclosed by the embodiment of the invention, the deformation of the release film in the direction far away from the forming platform is controlled or the release film is controlled to be in the first state (namely, the technical scheme disclosed by the embodiment of the invention is in a breathing type separation mode), so that the separation of the printing model and the release film and the liquid material filling are realized, the separation and backflow waiting time is greatly shortened, and the printing speed and the printing quality are improved. Particularly, the reliability of separation of the printing model and the release film can be improved, and thorough separation is realized; the speed and the capacity of liquid material backflow are improved, so that the high polymer liquid material backflow filling is easier and more reliable, and the advantages are more obvious especially under the condition that the contact area of a printing model and a release film is larger; satisfy continuous printing mode and vibrate the printing mode, especially can print in succession under the condition of not permeating from the type membrane with oxygen, promote printing speed and printing quality. The same is particularly important, the technical scheme can avoid using an oxygen permeable membrane release film with high price and cost, and greatly reduces the printing cost.

For example, in other embodiments, providing pressure, such as positive or negative pressure, to the breathing cavity between the release film and the transparent support plate may also be achieved by providing a transparent fluid to the breathing cavity between the release film and the transparent support plate. For example, the transparent fluid may be a gas (as described in the above embodiments) or a liquid, and the embodiments of the disclosure are not limited thereto as long as a required pressure can be provided for the breathing cavity between the release film and the transparent support plate.

For example, in other embodiments, the release film is deformed in a direction away from the forming platform or is in the first state by applying an external force to the release film. For example, in some examples, a moving member is disposed at the release film, and external force is applied to the release film by controlling the moving member, so that the release film is deformed in a direction away from the forming platform. At this time, the 3D printing method and the 3D printing process are as shown in fig. 13 to 16.

For example, the silo subassembly includes the silo, the silo includes the ring frame, the ring frame encloses into relative first opening and second opening each other, set up in the second opening side of ring frame and cover the second opening from the type membrane, be provided with the moving member from type membrane department, this moving member structure can drive from the type membrane reciprocates, through to exert external force from the type membrane makes from the type membrane to keeping away from the direction of shaping platform and taking place deformation or be in first state and include: through removing the moving piece makes from the type membrane to keeping away from the direction of shaping platform and taking place deformation or be in this moving piece of first state and can be the briquetting.

For example, the moving member may include a pressing block and an adsorbing block located below the release film, and the adsorbing block may drive the pressing block to move up and down. Alternatively, the pressing block may be provided at an edge region of the release film located at the second opening.

For example, as shown in fig. 13, the pressing member may be a pressing block 30 as shown in fig. 13, and the pressing block 30 is disposed on one side of the release film 3 close to the forming platform 200 for applying an external force to the release film 3. For example, in some embodiments, the pressing block 30 is made of a magnetic induction material and is disposed on a side of the release film 3 close to the forming platform and at the second opening of the trough. For example, the compact 30 conforms to the shape of the second vent holes of the material assembly 10 of the previous embodiment.

For example, a side of the pressing block 30 away from the forming table (i.e., a lower side in the drawing) is provided with a magnet block 31 for driving the pressing block 30. For example, the iron attracting block 31 may be formed of a permanent magnetic material to drive the compact 30 by magnetic attraction. For example, the iron absorption block 31 is disposed on a side of the release film away from the forming platform and at the second opening of the trough. For example, the magnet block 31 may be connected to a motor to drive the magnet block 31 to move by the motor. For example, in one example, the motor is a linear motor 32, and as shown in fig. 13, the linear motor 32 is connected to the magnet block 31 and configured to drive the magnet block 31 to move up and down, thereby applying an external force to the release film 3.

For example, as shown in fig. 14, after a polymerization layer is formed by photocuring, the linear motor 32 drives the magnet block 31 to move downward, the magnet block 31 attracts the pressing block 30 to move, so that the release film 3 moves away from the forming platform 200, and at this time, the polymerization layer 100B and the release film 3 are gradually separated from the edge portion to the middle portion. As shown in fig. 14, the polymeric layer 100B starts to be gradually separated from the release film 3 from the edge, and the printing material gradually reflows to a portion where the polymeric layer 100B is separated from the release film 3.

For example, as shown in fig. 15, after the linear motor 32 moves to the predetermined position, waiting for several seconds, for example, waiting for 1 to 10 seconds, the polymeric layer 100B is completely separated from the release film 3, and the printing material is completely reflowed, that is, the printing material is sufficiently filled between the release film 3 and the polymeric layer 100B. At the same time, the forming station 200 can move with the formed polymeric layer 100B to the next forming position.

For example, as shown in fig. 16, after the forming platform 200 moves to a lower forming position with the polymeric layer 100B, the linear motor 32 starts moving upward and resets, waits for several seconds, for example, 1-10 seconds, and performs photocuring after the material to be printed and the release film 3 are stationary to form a lower polymeric layer.

For example, in other embodiments, the release film is driven to move away from the forming platform, so that the release film deforms away from the forming platform. At this time, the 3D printing method and the 3D printing process are as shown in fig. 17 to 20.

For example, the silo subassembly can reciprocate, through to exert external force to from the type membrane makes from the type membrane to keeping away from the direction of shaping platform and taking place deformation or be in first state and include: through reciprocating the silo subassembly makes from the type membrane to the direction of keeping away from the shaping platform deformation or be in the first state.

For example, as shown in fig. 17, a motor is disposed on a side (lower side in the figure) of the trough away from the forming platform, and the trough is driven by the motor to move so that the release film deforms in a direction away from the forming platform. For example, the motor is a linear motor 33 shown in fig. 17, and the linear motor 33 is connected to the trough and configured to drive the trough to move, for example, to move the trough up and down.

For example, as shown in fig. 18, after a polymer layer is formed, the linear motor 33 drives the trough to move downward, and the release film 3 moves away from the forming platform 200. As shown in fig. 18, at this time, at least the edge portion of the release film 3 is deformed in a direction away from the molding stage 200, the polymeric layer 100B starts to be gradually separated from the release film 3 from the edge portion toward the middle portion, and the printing material gradually reflows to the portion where the polymeric layer 100B is separated from the release film 3.

For example, as shown in fig. 19, when the linear motor 33 moves to a predetermined position, waiting for a period of several seconds, for example, 1 to 10 seconds, the polymeric layer 100B is completely separated from the release film 3, and the printing material is completely reflowed, i.e., the printing material is sufficiently filled between the release film 3 and the polymeric layer 100B. At the same time, the forming station 200 moves with the formed polymeric layer 100B to the next forming position.

For example, as shown in fig. 20, after the forming platform 200 moves to a lower forming position with the polymeric layer 100B, the linear motor 33 starts to move upward and reset, waits for several seconds, for example, 1 to 10 seconds, and after the printing material and the release film 3 are stationary, performs photocuring using a photocuring device to form a lower polymeric layer.

For example, in other embodiments, the breathing cavity is disposed on a side of the release film close to the forming platform, and the positive pressure is provided to the breathing cavity so that the release film deforms in a direction away from the forming platform. At this time, the 3D printing method and the 3D printing process are as shown in fig. 21 to 24.

For example, as shown in fig. 21, a closed printing chamber 40 is formed on the side of the release film close to the forming platform, and the printing chamber 40 is implemented as the breathing chamber. For example, the print chamber 40 includes a lifting device 300, a forming table 200, and a chute assembly 10. The printing chamber 40 is configured as a closed space so that the state of the release film 3 can be controlled by supplying air pressure into the printing chamber 40.

For example, as shown in fig. 22, after one polymeric layer 100B is formed, the forming platform 200 moves to the next forming position, for example, a positive pressure is provided to the printing chamber 40 by the air pressure supply device 20, so that the release film 3 is under the pressure, and the part of the release film not bonded with the polymeric layer deforms away from the forming platform 200, for example, to assume the deformation of fig. 22, thereby forcing the release film 3 to gradually separate from the polymeric layer 100B from the edge part to the middle part; meanwhile, the printing material 100A automatically flows and fills to the region where the polymeric layer 100B is separated from the release film 3 by the pressure.

For example, as shown in fig. 23, after the polymeric layer 100B is completely separated from the release film 3 and the printing material 100A is sufficiently filled between the release film 3 and the polymeric layer 100B, the air pressure supply device 20 provides negative pressure into the printing chamber 40 until the pressure in the printing chamber 40 is equal to or slightly greater than the atmospheric pressure, for example, making the pressure in the printing chamber 40 slightly greater than the atmospheric pressure can counteract the gravity of the printing material itself to prevent the release film 3 from generating the sagging phenomenon under the gravity of the printing material.

For example, as shown in fig. 24, after the pressure in the printing chamber 40 is restored, the release film 3 is restored to the first state, and then, the photo-curing device starts the photo-curing operation to form the next polymerization layer.

For example, in some embodiments, the 3D printing method provided by the embodiments of the present disclosure may further include: the temperature of the liquid 3D printing material in the chute assembly is controlled such that the temperature of the liquid 3D printing material is maintained at a suitable temperature, such as 18-30 ℃, such as 24-29 ℃, such as 25 ℃, etc. At this time, the liquid 3D printing material may have certain fluidity and be easily cured.

For example, the temperature of the liquid 3D printed material in the gutter assembly 10 may be controlled using a temperature control device 103 provided in the gutter assembly 10. For example, heating the liquid 3D printing material may reduce the viscosity of the liquid 3D printing material, thereby improving the fluidity of the liquid 3D printing material, so that the liquid 3D printing material more easily fills the space between the release film 3 and the molding surface 200A.

For example, after the forming platform 200 is placed at the next forming position, it may wait for 1 second to 5 minutes, such as 10 seconds, 30 seconds, or 1 minute, to stabilize the forming platform 200 and the formed polymer layer, and then perform the curing process using the photo-curing device 400.

For example, in some embodiments, light may be provided to illuminate the shaped area using a light-curing device, for example, the process may include: continuously supplying light for 0.5 seconds to 2 minutes; alternatively, in some embodiments, the light may be provided intermittently, and the interval time between any two adjacent light supplies in the intermittent light supply is 1 second to 10 minutes, and the time between each light supply is 1 second to 2 minutes.

For example, in some embodiments, after the 3D object is printed, the 3D object may be left to stand for 1 second to 10 minutes, such as 30 seconds, 3 minutes, or 6 minutes, etc., to stabilize the shape of the 3D object, and then the forming platform 200 may be driven to the initial position using the lifting device 300.

For example, after the lifting device 300 drives the forming platform 200 to the initial position, the base 200B on the forming platform 200 may be removed manually or by mechanical control, for example, the base 200B and the 3D object formed on the base 200B are removed by using an auxiliary tool such as a blade or a knife, and then, for example, the removed 3D object with the base 200B is put into a cleaning device, cleaned for a certain time, for example, for 10 seconds to 5 minutes, for example, for 1 minute or 3 minutes, and then the 3D object is taken out and dried. The base 200B may then be removed using an auxiliary tool, such as forceps or/and tweezers, to remove the 3D object.

For example, in some embodiments, the 3D printing method may further include: after the 3D object is printed and the 3D object is removed, a second curing process is performed on the 3D object to further cure the 3D object to stabilize the final shape of the 3D object. For example, the second curing treatment may be various forms of curing treatments such as a water bath curing treatment, a salt bath curing treatment, a photo-curing treatment, or a thermal curing treatment. The time for the second curing may be determined according to practical situations, such as the properties of the liquid 3D printing material and the final curing degree. For example, in some examples, the time for the second curing may be selected to be 0-24 hours, such as 5 hours or 12 hours, and the like.

For example, in some embodiments, when the liquid 3D printing material includes a plurality of different components, the above-described curing light may cure some of the components of the liquid 3D printing material, while the second curing process may cure other cured components of the liquid 3D printing material, thereby achieving complete curing of the 3D object; alternatively, in some embodiments, the liquid 3D printing material may also comprise a single component, in which case the surface layer material formed on the molding surface 200A may be cured using the light-curing device as described above, and the second curing process may be applied to the material inside the surface layer material to achieve complete curing of the 3D object; alternatively, in some embodiments, the liquid 3D printing material formed on the molding surface 200A may be fully cured using the photo-curing device, and the second curing process may stabilize the final shape of the 3D object to obtain a stable and robust 3D printed object.

The following points need to be explained: (1) the drawings of the embodiments of the disclosure only relate to the structures related to the embodiments of the disclosure, and other structures can refer to the common design. (2) Without conflict, embodiments of the present disclosure and features of the embodiments may be combined with each other to arrive at new embodiments.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A 3D printing method, comprising:

driving a forming platform to an initial forming position, and forming a forming area between the forming platform and a release film, wherein the release film is positioned in a trough assembly;

controlling the release film to be in a first state so as to keep the thickness of the printing material between the molding surface of the molding platform and the release film;

providing light to illuminate a molding area to cure the printing material illuminated by the light and located between the molding platform and the release film and form a polymeric layer on the molding surface;

controlling the release film to deform towards the direction far away from the forming platform, so that the polymeric layer and the release film are gradually separated from the periphery of the contact surface to the center, and meanwhile, the printing material is gradually filled along the separation gap;

driving the forming platform to a next forming position;

recovering the release film to the first state;

providing light to illuminate a molding area to cure the printing material illuminated by the light and located between the molding platform and the release film and form a next polymeric layer on the molding surface;

at least one next polymeric layer is formed on the molding surface.

2. The method according to claim 1, wherein the release film is deformed in a direction away from the forming platform or in the first state by controlling a magnitude relation between a pressure of the release film at a side away from the forming platform and a pressure of the release film at a side close to the forming platform.

3. The method according to claim 2, wherein a breathing cavity is arranged on one side of the release film close to the forming platform, and the pressure of the breathing cavity is adjustable through the light-transmitting fluid; or

A breathing cavity is arranged on one side of the release film, which is far away from the forming platform, and the pressure intensity of the breathing cavity is adjustable through light-transmitting fluid;

the light-transmissive fluid includes a light-transmissive gas and/or a light-transmissive liquid.

4. The method of claim 3, wherein the release film is in the first state by providing positive pressure to a breathing cavity on a side away from the forming platform; or

The release film is in the first state by providing negative pressure for a breathing cavity close to one side of the forming platform.

5. The method according to claim 4, wherein, in the case that a breathing cavity is provided on a side of the release film away from the forming platform, a transparent support plate is provided on a side of the release film away from the forming platform, the breathing cavity is formed by the release film and the transparent support plate, and the distance between the release film and the transparent support plate in the first state is 0.05mm-5 mm.

6. The method of claim 5, wherein providing positive pressure to the breathing chamber comprises: controlling the air pressure of the breathing cavity to be equal to or higher than the atmospheric pressure;

preferably, the above-atmospheric pressure is not more than 0.1Kpa above atmospheric pressure.

7. The method of claim 3, wherein the pressure of the side of the release film away from the forming platform is controlled to be less than the pressure of the side of the release film close to the forming platform, and:

providing negative pressure for the breathing cavity on one side far away from the forming platform to enable the release film to deform in the direction far away from the forming platform; or

Through being close to the breathing cavity of one side of shaping platform provides the malleation so that from the type membrane to keeping away from shaping platform's direction takes place deformation.

8. The method of claim 7, wherein the side of the release film away from the forming platform has a breathing cavity, and the deforming of the release film away from the forming platform by providing negative pressure to the breathing cavity comprises:

a transparent support plate is arranged on one side of the release film, which is far away from the forming platform, and the release film and the transparent support plate form the breathing cavity; providing negative pressure to the breathing cavity between the release film and the transparent support plate so as to enable the release film to deform towards the transparent support plate;

preferably, the negative pressure is provided at a level of from 0.1KPa to 10KPa less than atmospheric pressure.

9. The method according to claim 1, wherein the release film is deformed in a direction away from the forming platform or in the first state by applying an external force to the release film.

10. The method of claim 9, wherein the chute assembly comprises:

the material tank comprises an annular frame, wherein the annular frame encloses a first opening and a second opening which are opposite to each other;

the release film is arranged on the second opening side of the annular frame and covers the second opening, a moving piece is arranged at the release film and is constructed to drive the release film to move up and down,

through to exert external force from the type membrane makes from the type membrane to keeping away from the direction of shaping platform and taking place deformation or be in the first state includes: the moving piece is moved to enable the release film to deform towards the direction far away from the forming platform or to be in the first state.

11. The method of claim 10, wherein the moving member comprises a pressing block located above the release film and an adsorption block located below the release film, and the adsorption block drives the pressing block to move up and down.

12. The method of claim 9, wherein the chute assembly is movable, and deforming the release film in a direction away from the forming platform or in the first state by applying an external force to the release film comprises: through reciprocating the silo subassembly makes from the type membrane to keeping away from the direction of shaping platform and taking place deformation or be in first state.

13. The method of claim 1, wherein driving the forming table to a next forming position comprises: driving the forming platform to move by a displacement equal to the thickness of each polymeric layer;

preferably, driving the forming table to move by a displacement equal to the thickness of each polymeric layer comprises:

driving the forming platform to move a first distance in a direction away from the release film so that the forming platform is located at a middle position, driving the forming platform to move a second distance from the middle position towards the release film so that the forming platform is located at a next forming position, wherein the first distance is greater than the second distance, and the difference between the first distance and the second distance is equal to the thickness of each polymerization layer; or

And driving the forming platform to move towards the direction far away from the release film by a distance equal to the thickness of each polymerization layer.

14. The method according to claim 1, wherein the controlling of the deformation of the release film in the direction away from the forming platform is performed before, simultaneously with, or after the driving of the forming platform to the next forming position.

15. The method according to any one of claims 1 to 14, wherein the release film in the first state produces an absolute value of deformation of no more than 0.5mm, based on a flat tensioned state of the release film; and/or

Control from the type membrane to keeping away from shaping platform's direction takes place deformation, include: and taking the release film in the first state as a reference, so that the deformation amount of the release film at the maximum deformation position in the direction far away from the forming platform is greater than 0.1 mm.