CN110920053B

CN110920053B - Device and method for continuous 3D printing by ultrasonic atomization coating

Info

Publication number: CN110920053B
Application number: CN201911190354.6A
Authority: CN
Inventors: 彭冲; 夏春光; 贺晓宁
Original assignee: Bmf Nano Material Technology Co ltd
Current assignee: Bmf Nano Material Technology Co ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2023-04-21
Anticipated expiration: 2039-11-28
Also published as: CN110920053A

Abstract

The application relates to a method for continuous 3D printing by ultrasonic atomization coating, which comprises the following steps: s1: providing a device for continuous 3D printing by adopting an ultrasonic atomization coating; s2: focusing the printing platform; s3: focusing the liquid level of the liquid tank; s4: and controlling the spraying equipment to spray photosensitive resin to the space above the liquid tank and below the optical equipment, simultaneously controlling the printing platform to continuously descend at the speed V, simultaneously controlling the exposure intensity L of the optical equipment to continuously expose according to the 3D model slice pattern, and performing 3D printing until the printed sample is completely printed. The beneficial effects of the invention are as follows: since continuous printing can improve printing efficiency, since the microstructure array can be printed without interference of external force (doctor blade movement or release force, etc.), layering may be less noticeable than in the conventional manner due to continuous printing.

Description

Device and method for continuous 3D printing by ultrasonic atomization coating

Technical Field

The application belongs to the technical field of 3D printing, and particularly relates to a device and a method for continuous 3D printing by using an ultrasonic atomization coating.

Background

The existing photo-curing 3D printers can be divided into: doctor blade type and release type.

1. Scraper type: a photosensitive resin thin layer with controllable thickness is formed above a printing platform or a device being printed by adopting a scraper, a patterned light path is obtained by adopting DLP, LCOS, LCD and the like, the patterned light path is directly irradiated on the photosensitive resin thin layer for curing, the platform descends by one layer after the photosensitive resin thin layer is cured, the scraper scrapes the photosensitive resin to form a new layer thickness, and the 3D model is finally obtained after the layer-by-layer curing.

2. Release type: a light-transmitting release device (fluorine-containing film, fluorine-containing film stuck on glass and the like) with good release effect is adopted, a photosensitive resin thin layer with controllable thickness is formed in the middle of a printing platform or a device being printed, then a patterned light path is obtained by adopting DLP, LCOS, LCD and the like, the photosensitive resin thin layer is irradiated to be cured through the release device, after one layer is cured, the platform descends for one layer thickness, the printing platform ascends, the photosensitive resin forms a new layer thickness, and the photosensitive resin is cured layer by layer, so that the 3D model is finally obtained.

The current drawbacks are the following 3 points:

1. the efficiency is low: currently, existing photocuring 3D printing devices, whether in a doctor blade type or a release type, need to coat a layer of liquid and then expose the liquid, wherein the coating layer and the exposure are performed at intervals, and the coating layer is long in time, so that the printing efficiency is low.

2. The layering is obvious: since release and exposure curing are needed, each layer is not continuous in curing, so that the printed sample piece has obvious layering.

3. The microstructure cannot be printed: when printing microstructures, such as arrays of bars of pixel-level diameter, the release force or doctor blade movement can damage the microstructure, resulting in failure of the printed microstructure.

Disclosure of Invention

The invention aims to solve the technical problems that: in order to solve the defects of obvious 3D printing layering and printing microstructure in the prior art, the device and the method for continuous 3D printing by adopting the ultrasonic atomization coating are provided.

The technical scheme adopted for solving the technical problems is as follows: an apparatus for continuous 3D printing with an ultrasonic atomized coating, comprising:

a liquid tank for loading the photosensitive resin;

the printing platform is arranged in the liquid tank and used as a bearing surface for forming the 3D model;

the optical device is positioned above the liquid tank, is used for continuously outputting UV light patterns after the 3D model is sliced and focusing the UV light patterns on the liquid level of the liquid tank, and can monitor the definition of the projected patterns through a CCD;

a spraying device for spraying photosensitive resin to a space above the liquid tank and below the optical device;

the driving assembly is connected with the liquid tank and the printing platform and is used for driving the liquid tank or the printing platform to move; the control system is provided with a display (29) and an industrial personal computer (28) to form the control system;

the optical device includes:

a DLP optical system device main body (26), wherein the DLP optical system device main body (26) comprises a CCD for monitoring the definition of the focal plane pattern;

a lens (10) connected below the DLP optical system device main body (26);

a lens gas protection cover (11) connected to one side of the end of the lens (10) for generating a gas flow so that the lens (10) is prevented from contacting the spraying device to spray the photosensitive resin;

the spraying apparatus includes: an ultrasonic atomizing nozzle (5) arranged on one side of the space above the liquid tank (3) and below the optical equipment for spraying atomized photosensitive resin (22),

the ultrasonic atomizing nozzle (5) is arranged on the bottom plate (1) through an atomizer supporting seat (4),

the spraying equipment is controlled to focus the printing platform (9) before spraying photosensitive resin to the space above the liquid tank (3) and below the optical equipment, the liquid level of the liquid tank (3) is focused,

the liquid level focusing step of the liquid tank (3) is that photosensitive resin is added into the liquid tank (3) until the photosensitive resin just overflows from a drainage port (8), an optical device is controlled to project a focusing pattern to the liquid level through the industrial personal computer (28), the height of the liquid tank (3) is controlled, and the definition of the projected pattern is monitored through a CCD, so that the liquid level is on the focal plane of the optical projection pattern;

and continuously outputting UV light patterns sliced by the 3D model by using the optical equipment and focusing the UV light patterns on the liquid level of the liquid tank (3) so as to continuously deposit and mold the atomized photosensitive resin (22), wherein the printing platform (9) continuously descends under the drive of the driving component in the whole molding process, and the 3D model is integrally printed after the atomized photosensitive resin is deposited.

Preferably, the device for continuous 3D printing with ultrasonic atomized coating according to the present invention, the optical apparatus comprises:

a DLP optical system device main body, wherein the DLP optical system device main body comprises a CCD for monitoring the definition of the focal plane pattern;

a lens connected below the DLP optical system apparatus main body;

and the lens gas protection cover is connected to one side of the end part of the lens and is used for generating gas flow so as to prevent the lens from contacting the spraying equipment to spray photosensitive resin.

Preferably, in the device for performing continuous 3D printing by using the ultrasonic atomization coating, the lens gas protection cover is connected with a lens gas flow regulating valve, and the lens gas flow regulating valve is used for controlling the flow velocity of the gas flow generated by the lens gas protection cover.

Preferably, the device for continuous 3D printing with ultrasonic atomized coating according to the present invention, the spraying apparatus comprises:

the ultrasonic atomization nozzle is arranged on one side of the space above the liquid tank and below the optical equipment and can spray atomized photosensitive resin.

Preferably, in the device for continuous 3D printing by using the ultrasonic atomization coating, the ultrasonic atomization nozzle is connected with an atomization gas flow regulating valve, and the atomization gas flow regulating valve is used for controlling the flow of the atomized photosensitive resin sprayed by the ultrasonic atomization nozzle.

Preferably, the device for continuous 3D printing by adopting the ultrasonic atomization coating provided by the invention has the advantages that the spray system sealing cover is surrounded outside the ultrasonic atomization nozzle, the lens and the liquid tank and is used for ensuring that atomized photosensitive resin does not pollute the environment.

A method for continuous 3D printing with an ultrasonic atomized coating, comprising the steps of:

s1: providing a device for continuous 3D printing by adopting an ultrasonic atomization coating;

s2: focusing the printing platform;

s3: focusing the liquid level of the liquid tank;

s4: controlling a spraying device to spray photosensitive resin to the space above the liquid tank and below the optical device, simultaneously controlling a printing platform to continuously descend at a speed V, simultaneously controlling the exposure intensity L of the optical device to continuously expose according to the 3D model slice pattern, and performing 3D printing until a printed sample is completely printed;

s5: after printing, closing the spraying equipment, taking out the printing platform after the atomized photosensitive resin is deposited, and performing cleaning and baking treatment procedures;

s2, the step of focusing the printing platform (9) is that the printing platform (9) is installed at a position to be printed, the industrial personal computer (28) controls the optical equipment to project focusing patterns, the definition of the projected patterns is monitored through the CCD, and then the Z axis in the XYZ displacement platform (7) is controlled to move, so that the printing platform (9) is focused;

s3, adding photosensitive resin into the liquid tank (3) until the photosensitive resin just overflows from the drainage port (8), controlling optical equipment to project a focusing pattern to the liquid level through an industrial personal computer (28), controlling the height of the liquid tank (3), and monitoring the definition of the projected pattern through a CCD (charge coupled device) to enable the liquid level to be on the focal plane of the optical projection pattern;

the optical device includes:

a lens (10) connected below the DLP optical system device main body (26);

and the lens gas protection cover (11) is connected to one side of the end part of the lens (10) and is used for generating gas flow so as to prevent the lens (10) from contacting the spraying equipment to spray photosensitive resin.

Preferably, the method for continuous 3D printing with ultrasonic atomized coating of the present invention further comprises the steps of setting and adjusting the operation parameters of the optical device, the spraying device and the driving assembly before step S2.

Preferably, the method for continuous 3D printing with ultrasonic atomized coating of the present invention, the operation parameter setting and adjusting steps of the optical device, the spraying device, the driving assembly, comprise:

adjusting spraying equipment to enable the spraying photosensitive resin to achieve a stable and uniform effect, and recording the flow rate of the injection pump at the moment as Q;

adjusting an atomization gas flow regulating valve to enable atomized photosensitive resin to uniformly fall into a forming area, and recording the gas flow at the moment as P1; adjusting a lens airflow flow regulating valve to ensure that atomized photosensitive resin is isolated from the lens, and meanwhile, the spraying effect is not influenced, and recording the gas flow as P2;

then calculating the corresponding deposition speed of the atomized photosensitive resin according to the flow rate Q and the spraying area S, wherein V=Q/S;

finding out a proper slice layer thickness C according to the relation between the exposure intensity L of the photosensitive resin, the curing time t and the curing depth Dp;

and slicing the 3D model according to the obtained layer thickness C by using slicing software to form a 3D model slice pattern.

Preferably, the method for continuous 3D printing by using ultrasonic atomization coating of the invention,

s2, the printing platform is arranged at the position to be printed, the industrial personal computer controls the optical equipment to project focusing patterns, the definition of the projected patterns is monitored through the CCD, and then the Z axis in the XYZ displacement platform is controlled to move, so that the printing platform is focused;

and S3, adding photosensitive resin into the liquid tank until the photosensitive resin just overflows from the drainage port, controlling optical equipment to project a focusing pattern to the liquid level through an industrial personal computer, controlling the height of the liquid tank, and monitoring the definition of the projected pattern through a CCD (charge coupled device) to enable the liquid level to be on the focal plane of the optical projection pattern.

The beneficial effects of the invention are as follows: since continuous printing can improve printing efficiency, since the microstructure array can be printed without interference of external force (doctor blade movement or release force, etc.), layering may be less noticeable than in the conventional manner due to continuous printing.

Drawings

The technical scheme of the application is further described below with reference to the accompanying drawings and examples.

FIG. 1 is a schematic diagram of an apparatus for continuous 3D printing using ultrasonic atomized coating according to an embodiment of the present application;

FIG. 2 is a schematic diagram of the apparatus removal control system for continuous 3D printing using ultrasonic atomized coatings in accordance with an embodiment of the present application;

FIG. 3 is a schematic view of the structure of an optical device, a spraying device and a liquid tank according to the embodiment of the application;

FIG. 4 is a schematic diagram of the effect of printing layering by the device for continuous 3D printing using ultrasonic atomized coating according to the embodiment of the application;

fig. 5 is a schematic diagram of the effect of printing a microstructure array by the device for continuous 3D printing using ultrasonic atomized coating according to the embodiment of the application.

The reference numerals in the figures are:

1. the device comprises a base plate, a liquid tank supporting seat, a liquid tank 3, an atomizer supporting seat, an ultrasonic atomizing spray head 5, a liquid supply pipe 6, a 7 XYZ displacement table, a leakage port 8, a printing platform 9, a lens 10, a lens gas protecting cover 11, a lens gas flow regulating valve 12, a atomizing gas flow regulating valve 13, a atomizing gas flow regulating valve 14, a atomizing gas cover 15, an injection pump 16, an optical machine cable 17, an injection pump cable 18, an ultrasonic generator cable A, an ultrasonic generator cable B, a lens gas protecting cover 20, a lens gas protecting cover pipe 21, an atomizing gas cover pipe 22, an atomized photosensitive resin 25, a spray system sealing cover 26, a DLP optical system device main body 27, an air compressor 28, an industrial control computer 29, a display and an ultrasonic generator 30.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application can be understood by those of ordinary skill in the art in a specific context.

The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in combination with embodiments.

Examples

The present embodiment provides an apparatus for continuous 3D printing using ultrasonic atomized coating, as shown in fig. 1-3, comprising:

a liquid tank 3 for loading a photosensitive resin (specifically, in the present embodiment, the liquid tank 3 is mounted on an XYZ displacement stage 7 through a liquid tank support base 2, the XYZ displacement stage 7 is a movable stage capable of XYZ three-axis movement, and the XYZ displacement stage 7 is mounted on the base plate 1);

the printing platform 9 is arranged in the liquid tank 3 and is used as a bearing surface for forming a 3D model;

the optical device is positioned above the liquid tank 3 and is used for continuously outputting UV light patterns after the 3D model is sliced and focusing the UV light patterns on the liquid level of the liquid tank 3, and the definition of the projected patterns can be monitored through a CCD;

a spraying device for spraying photosensitive resin to a space above the liquid tank 3 and below the optical device; the main function is to generate uniform atomized photosensitive resin 22 which is uniformly distributed on the liquid surface of the liquid tank 3 under the action of air flow and gravity;

and the driving assembly is connected with the liquid tank 3 and the printing platform 9 and is used for driving the liquid tank 3 or the printing platform 9 to move.

The working principle is as follows: the UV light pattern sliced by the 3D model is continuously output by optical equipment and focused on the liquid level of the liquid tank 3, so that atomized photosensitive resin 22 is continuously deposited and molded, the printing platform 9 continuously descends under the drive of the driving component in the whole molding process, and the 3D model is integrally printed after the atomized photosensitive resin is deposited.

Preferably, the apparatus for continuous 3D printing using ultrasonic atomized coating according to the present embodiment, as shown in fig. 1 to 3, the optical device includes:

a DLP optical system apparatus main body 26, wherein the DLP optical system apparatus main body 26 contains a CCD for monitoring the definition of the focal plane pattern;

a lens 10 connected below the DLP optical system apparatus main body 26;

a lens gas shield 11 connected to one side of the end of the lens 10 for generating a gas flow so that the lens 10 is prevented from contacting the spraying device to spray the photosensitive resin.

Specifically, in the present embodiment, the lens gas shroud 11 is connected to the air compressor 27 through the lens gas shroud air pipe 20 to generate an air flow.

Preferably, as shown in fig. 1-3, the lens gas protecting cover 11 is connected with a lens gas flow regulating valve 12, and the lens gas flow regulating valve 12 is used for controlling the flow rate of the gas flow generated by the lens gas protecting cover 11. Specifically, in the present embodiment, the lens gas flow rate adjustment valve 12 is mounted on the lens gas protection cover gas pipe 20.

Preferably, the device for continuous 3D printing with ultrasonic atomized coating according to the present embodiment, as shown in fig. 1-3, the spraying apparatus includes:

an ultrasonic atomizing nozzle 5 is provided on one side of the space above the liquid tank 3 and below the optical device, and is capable of spraying atomized photosensitive resin 22. Specifically, in the present embodiment, the ultrasonic atomizing head 5 is connected to the ultrasonic generator 30 via the ultrasonic generator cable B19, and is connected to the syringe pump 15 via the liquid supply pipe 6. The ultrasonic atomizing nozzle 5 is arranged on the bottom plate 1 through the atomizer supporting seat 4.

Preferably, as shown in fig. 1-3, the ultrasonic atomization nozzle 5 is connected with an atomization gas flow regulating valve 13, and the atomization gas flow regulating valve 13 is used for controlling the flow of the atomized photosensitive resin sprayed by the ultrasonic atomization nozzle 5. Specifically, in this embodiment, an atomizing airflow cover 14 is disposed at the end of the ultrasonic atomizing nozzle 5, the atomizing airflow cover 14 is connected to an air compressor 27 through an atomizing airflow cover air pipe 21, and an atomizing airflow flow rate adjusting valve 13 is disposed on the atomizing airflow cover air pipe 21.

Preferably, as shown in fig. 1-3, the device for continuous 3D printing with ultrasonic atomization coating of the present embodiment is characterized in that a spray system sealing cover 25 is enclosed outside the ultrasonic atomization nozzle 5, the lens 10 and the liquid tank 3, so as to ensure that the atomized photosensitive resin does not pollute the environment.

Preferably, as shown in fig. 1, the apparatus for continuous 3D printing using ultrasonic atomized coating of the present embodiment is provided with a control system composed of a display 29 and an industrial personal computer 28, and is connected to an ultrasonic generator 30, an injection pump 15, and a DLP optical system main body 26 through an ultrasonic generator cable a18, an injection pump cable 17, and an optical machine cable, respectively, to control the ultrasonic generator 30, the injection pump 15, and the DLP optical system main body 26.

The embodiment provides a method for continuous 3D printing by adopting ultrasonic atomization coating, which comprises the following steps:

s2: focusing the printing platform 9;

s3: focusing the liquid level of the liquid tank 3;

s4: controlling a spraying device to spray photosensitive resin to the space above the liquid tank 3 and below the optical device, simultaneously controlling the printing platform 9 to continuously descend at a speed V, simultaneously controlling the exposure intensity L of the optical device to continuously expose according to the 3D model slice pattern, and performing 3D printing until the printed sample 24 is completely printed;

s5: after printing, the spraying equipment is closed, and after the atomized photosensitive resin is deposited, the printing platform 9 is taken out for cleaning and baking treatment procedures.

Preferably, the method for continuous 3D printing with ultrasonic atomized coating of the present embodiment further includes, before step S2, steps of setting and adjusting operation parameters of the optical device, the spraying device, and the driving assembly.

Preferably, the method for continuous 3D printing with ultrasonic atomized coating according to the present embodiment includes the steps of setting and adjusting operation parameters of the optical device, the spraying device, and the driving assembly:

adjusting the spraying equipment to enable the spraying photosensitive resin to achieve a stable and uniform effect, and recording the flow rate of the injection pump 15 at the moment as Q;

the atomized gas flow regulating valve 13 is regulated to uniformly drop the atomized photosensitive resin 22 to the molding area, and the gas flow at this time is recorded as P ₁ The method comprises the steps of carrying out a first treatment on the surface of the The airflow flow regulating valve 12 of the lens is regulated to ensure that the atomized photosensitive resin 22 is isolated from the lens 10, the spraying effect is not influenced, and the gas flow at the moment is recorded as P ₂ ；

finding a proper slice layer thickness C (preferably 1-20 μm) according to the relation between the exposure intensity L of the photosensitive resin, the curing time t and the curing depth Dp;

Preferably, the method for continuous 3D printing with ultrasonic atomized coating of the present embodiment:

in S2, the step of focusing the printing platform 9 is that the printing platform 9 is arranged at a position to be printed, the industrial personal computer 28 controls the optical equipment to project a focusing pattern, monitors the definition of the projected pattern through a CCD, and controls the Z axis in the XYZ displacement platform 7 to move so as to focus the printing platform 9;

in S3, the liquid level focusing step of the liquid tank 3 is that photosensitive resin is added into the liquid tank 3 until the photosensitive resin just overflows from the drainage port 8, the optical equipment is controlled to project a focusing pattern to the liquid level through the industrial personal computer 28, the height of the liquid tank 3 is controlled, and the definition of the projected pattern is monitored through the CCD, so that the liquid level is on the focal plane of the optical projection pattern.

According to the device and the method for continuous 3D printing by using the ultrasonic atomization coating, the printing efficiency can be improved due to continuous printing, the microstructure array can be printed due to no interference of external force (scraping knife moving or releasing force and the like) (fig. 5), and the layering is less obvious than that of the traditional mode due to continuous printing (fig. 4).

With the above-described preferred embodiments according to the present application as a teaching, the related workers can make various changes and modifications without departing from the scope of the technical idea of the present application. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of claims.

Claims

1. An apparatus for continuous 3D printing using an ultrasonic atomized coating, comprising:

a liquid tank (3) for loading a photosensitive resin;

the printing platform (9) is arranged in the liquid tank (3) and is used as a bearing surface for forming a 3D model;

the optical device is positioned above the liquid tank (3) and is used for continuously outputting UV light patterns after the 3D model is sliced and focusing the UV light patterns on the liquid level of the liquid tank (3);

a spraying device for spraying photosensitive resin to a space above the liquid tank (3) and below the optical device;

the driving assembly is connected with the liquid tank (3) and the printing platform (9) and is used for driving the liquid tank (3) or the printing platform (9) to move;

the control system is provided with a display (29) and an industrial personal computer (28) to form the control system;

the optical device includes:

a lens (10) connected below the DLP optical system device main body (26);

continuously outputting UV light patterns sliced by the 3D model by using the optical equipment and focusing the UV light patterns on the liquid level of the liquid tank (3) so as to continuously deposit and shape atomized photosensitive resin (22), continuously descending the printing platform (9) under the drive of the driving component in the whole forming process, and printing the 3D model after the atomized photosensitive resin is deposited;

the lens gas protection cover (11) is connected with a lens gas flow regulating valve (12), and the lens gas flow regulating valve (12) is used for controlling the flow speed of the gas flow generated by the lens gas protection cover (11);

the ultrasonic atomization nozzle (5) is connected with an atomization gas flow regulating valve (13), and the atomization gas flow regulating valve (13) is used for controlling the flow of atomized photosensitive resin sprayed by the ultrasonic atomization nozzle (5);

the ultrasonic atomization nozzle (5), the lens (10) and the liquid tank (3) are surrounded by a spray system sealing cover (25) for ensuring that the atomized photosensitive resin does not pollute the environment.

2. The apparatus for continuous 3D printing with ultrasonic atomized coating according to claim 1, wherein,

the method also comprises the steps of setting and adjusting the operation parameters of the optical equipment, the spraying equipment and the driving component before focusing the printing platform (9),

adjusting spraying equipment to enable the spraying photosensitive resin to achieve a stable and uniform effect, and recording the flow rate of the injection pump (15) at the moment as Q;

an atomized gas flow rate regulating valve (13) is regulated to uniformly drop the atomized photosensitive resin (22) to the molding area, and the gas flow rate at this time is recorded as P ₁ The method comprises the steps of carrying out a first treatment on the surface of the The airflow flow regulating valve (12) of the lens is regulated to ensure that the atomized photosensitive resin (22) is isolated from the lens (10) without influencing the spraying effect, and the gas flow at the moment is recorded as P ₂ ；

3. A method for continuous 3D printing with an ultrasonic atomized coating, comprising the steps of:

s2: focusing the printing platform (9);

s3: focusing the liquid level of the liquid tank (3);

s4: controlling a spraying device to spray photosensitive resin to the space above the liquid tank (3) and below the optical device, simultaneously controlling the printing platform (9) to continuously descend at a speed V, simultaneously controlling the exposure intensity L of the optical device to continuously expose according to the 3D model slice pattern, and performing 3D printing until a printed sample piece (24) is completely printed;

s5: after printing, closing the spraying equipment, taking out the printing platform (9) after the atomized photosensitive resin is deposited, and performing a cleaning and baking treatment process;

the optical device includes:

a lens (10) connected below the DLP optical system device main body (26);

the ultrasonic atomization nozzle (5), the lens (10) and the liquid tank (3) are surrounded by a spray system sealing cover (25) for ensuring that the atomized photosensitive resin does not pollute the environment;

the method also comprises the steps of setting and adjusting the operation parameters of the optical equipment, the spraying equipment and the driving assembly before the step S2; the operation parameter setting and adjusting steps of the optical device, the spraying device and the driving assembly comprise: