CN114734636B

CN114734636B - Photo-curing printing device and printing method

Info

Publication number: CN114734636B
Application number: CN202210414805.5A
Authority: CN
Inventors: 竺越; 庞伟; 刘浪
Original assignee: Zhejiang Positive Additive Manufacturing Co ltd
Current assignee: Zhejiang Positive Additive Manufacturing Co ltd
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2023-12-19
Anticipated expiration: 2042-04-20
Also published as: CN114734636A

Abstract

The invention relates to a photo-curing printing device and a printing method. The photo-curing printing device comprises a liquid tank and a first light source assembly; the liquid tank is used for containing liquid photosensitive materials; the first light source component is arranged opposite to the liquid level of the liquid photosensitive material and comprises a first laser and a first rotating piece, wherein the first laser is used for generating a light beam for solidifying the liquid photosensitive material and irradiating the light beam onto the liquid level of the liquid photosensitive material to form a first light spot, and the first rotating piece is connected with the first laser and is used for driving the first laser to rotate so that the first light spot rotates by taking the center of the first light spot as the center of a circle. The photocuring printing device enables the edge of the first light spot to be tangent with the edge line of the printing sheet in different shapes, ensures that the same point on the edge of the first light spot always irradiates and cures the edge line of the printing sheet, avoids the influence of the first light spot in different forms on the precision of the printing edge, and accordingly improves the surface precision and quality of a printing product.

Description

Photo-curing printing device and printing method

Technical Field

The invention relates to the technical field of 3D printing, in particular to a photo-curing printing device and a printing method.

Background

Additive manufacturing (i.e., 3D printing) is an advanced manufacturing technique based on the principle of discrete stacking. The method comprises the steps of firstly cutting a three-dimensional product model along the Z direction, solidifying materials with different initial forms (such as liquid, powder, solid and the like) into layers with specific shapes through 3D printing equipment, and then stacking the layers from bottom to top to form a three-dimensional product, so that the multi-disciplinary fields of three-dimensional model design, material processing and forming, machinery, automatic control and the like are integrated. The 3D printing technology is not constrained by the geometric shape and structure of the product, and can realize the rapid manufacturing of the complex structure, so that the method is widely applied to the fields of die manufacturing, articles for daily use, aerospace, biomedical treatment and the like.

The properties of the materials determine the 3D printing technology, and different materials are suitable for different 3D printing process methods. Current 3D printing process methods mainly include selective laser melting (Selective Laser Melting, SLM), laser Stereolithography (Laser Solid Forming, LSF), arc additive manufacturing (Wire and Arc Additive Manufacture, WAAM), electron beam melt-forming technology (Electron Beam Melting, EBM), laminated body manufacturing (Laminated Object Manufacturing, LOM), fused deposition modeling (Fused Deposition Modeling, FDM), stereolithography (SLA), and the like.

Stereolithography is the earliest commercial 3D printing technology with the highest market share. The technology takes liquid photosensitive resin as a material, and utilizes the characteristic that the liquid photosensitive resin can rapidly undergo polymerization reaction after being irradiated by ultraviolet light with certain wavelength and intensity to change the material from liquid state to solid state layer by layer, so as to finally form a preset three-dimensional product.

Stereoscopic light curing technology commonly uses three light sources, liquid crystal displays (LCD, liquid Crystal Display), digital light processing (DLP, digital Light Processing) and lasers. The LCD and the DLP are light pixel arrays, and when arcs with different curvatures are printed, the pixel arrays can print the edges of the arcs into a zigzag shape, so that the printing precision and quality of the photocuring printing on the curved edges of the three-dimensional product are affected. The surface accuracy and quality of the laser printing product are also affected by the shape of the edge of the light spot, so that the surface accuracy and quality of the product printed by the existing photo-curing printing device are required to be improved.

Disclosure of Invention

Based on this, in order to improve the printing accuracy and quality of the surface of the photo-cured printed product, a photo-cured printing apparatus and printing method are provided.

A photo-curing printing apparatus comprising:

a liquid tank for holding a liquid photosensitive material;

the first light source component is arranged opposite to the liquid level of the liquid photosensitive material and comprises a first laser and a first rotating piece, wherein the first laser is used for generating a light beam for solidifying the liquid photosensitive material and irradiating the light beam to the liquid level of the liquid photosensitive material to form a first light spot, and the first rotating piece is connected with the first laser and is used for driving the first laser to rotate so that the first light spot rotates by taking the center of the first light spot as the center of a circle.

The photo-curing printing device comprises a liquid tank and a first light source component, wherein the liquid tank is used for containing liquid photosensitive materials, the first light source component is used for providing a light source required by curing the liquid photosensitive materials, the first laser generates light beams, the light beams irradiate the liquid surface of the liquid photosensitive materials to form first light spots, and the liquid photosensitive materials in the area where the first light spots are located are rapidly polymerized and are changed from liquid to solid; the first rotating piece is used for driving the first laser to rotate by taking the axis of the first laser as a shaft, so that the first light spot is driven to rotate by taking the center as a circle.

In the printing and curing process, a first light source assembly is moved along a preset printing path, so that a first light spot irradiates liquid photosensitive materials on the preset printing path in sequence to form a complete printing sheet; and then solidifying and printing a plurality of printing layers from bottom to top, and sequentially stacking and connecting the plurality of printing layers to form a preset printing product. However, when the printed ply is cured, the printed ply has different edge shapes and different curvatures at various points on the edge. In order to ensure edge accuracy on each printed ply, the inner area surrounded by the printed ply edge lines is refilled when the printed ply edge lines are cured first when the printed ply is cured.

When the edge of the printing lamellar is solidified, firstly obtaining the edge line of the printing lamellar, selecting a Q point on the edge line as an initial point, selecting a P point on the edge of a first light spot as a printing point, moving a first laser to enable the P point of the printing point to coincide with the Q point of the initial point, rotating the first laser by using a first rotating piece to enable the edge of the first light spot to be tangent with the edge line of the printing lamellar, namely enabling the tangent line of the edge line at the Q point to be perpendicular to a straight line OP, and then moving the first laser to enable the P point of the printing point to sequentially pass through the edge line of the printing lamellar, so that solidification of the edge line of the printing lamellar is completed, and the printing edge is formed; therefore, the photocuring printing device rotates the first light spot through the first rotating piece, so that the edge of the first light spot can be tangent with the edge line of the printing lamellar with different shapes, the fact that the same point on the edge of the first light spot irradiates and cures the edge line of the printing lamellar in the printing process is guaranteed, the influence of the first light spot with different forms on the printing edge precision is avoided, and the surface precision and quality of a printing product are improved.

In one embodiment, the photo-curing printing device further comprises a moving assembly, and the first light source assembly is movably arranged on the moving assembly, so that the first light spot can move along a preset printing track on the liquid surface of the liquid photosensitive material.

In one embodiment, the photo-curing printing device further comprises a light spot detector, wherein the light spot detector is used for detecting the size and the shape of the first light spot;

and/or, the first light source assembly further comprises a first beam expander and a first focusing mirror, the first beam expander is used for adjusting the size of the first light spot, and the first light spot sequentially passes through the first beam expander and the first focusing mirror to irradiate on the liquid surface of the liquid photosensitive material.

In one embodiment, the photo-curing printing device further comprises a second light source assembly, the second light source assembly comprises a second laser and a vibrating mirror, the second laser is used for generating a light beam for curing the liquid photosensitive material, the vibrating mirror is used for reflecting the light beam generated by the second laser onto the liquid surface of the liquid photosensitive material to form a second light spot, the area of the second light spot is larger than that of the first light spot, and the reflecting angle of the vibrating mirror is adjustable.

In one embodiment, the second light source assembly further includes a second rotating member, where the second rotating member is connected to the second laser, and the second rotating member is configured to drive the second laser to rotate, so that the second light spot rotates around its center as a center of a circle.

In one embodiment, the second light source assembly further includes a second beam expander and a second focusing mirror, the second light spot sequentially passes through the second beam expander, the second focusing mirror and the galvanometer to reach the surface of the liquid photosensitive material, and the second beam expander is used for adjusting the size of the second light spot.

In one embodiment, a pallet is disposed in the liquid tank, the pallet is used for containing the cured printing product, the direction in which the liquid surface of the liquid photosensitive material is opposite to the first light source assembly is a first direction, and the pallet can move in the liquid tank along the first direction.

In one embodiment, the photo-curing printing device further comprises a scraper, the scraper can move in parallel relative to the liquid surface of the liquid photosensitive material, the surface, facing the liquid surface of the liquid photosensitive material, of the scraper is a scraping end surface, and the scraping end surface is parallel to the printing layer sheet.

A photo-curing printing method, using the photo-curing printing device, comprises the following steps:

s1: acquiring an edge line of the printing ply;

s2: selecting a P point on the edge of a first light spot as a printing point, wherein the center of the first light spot is an O point, and moving a first laser to enable the P point to move along the edge line, and the position of the P point on the edge line is a Q point;

s3: and controlling the first rotating piece to rotate the first laser, so that the straight line OP is perpendicular to the tangent line of the edge line at the point Q at any moment.

The photo-curing printing method comprises the steps that the photo-curing printing device comprises a liquid tank and a first light source component, wherein the liquid tank is used for containing liquid photosensitive materials, the first light source component is used for providing light sources required by curing the liquid photosensitive materials, a first laser generates light beams, the light beams irradiate the liquid surface of the liquid photosensitive materials to form first light spots, and the liquid photosensitive materials in the area where the first light spots are located are rapidly polymerized and are changed from liquid to solid; the first rotating piece is used for driving the first laser to rotate by taking the axis of the first laser as a shaft, so that the first light spot is driven to rotate by taking the center as a circle.

In one embodiment, the curvatures of the points on the first light spot edge are not equal, and the P point is the point with the largest curvature on the first light spot edge;

and/or, in the step S2 and the step S3, the method further includes the following steps: and sequentially solidifying two adjacent points ON an edge line according to the following method, wherein the two adjacent points ON the edge line are M points and N points, the P point is coincident with the M point, the straight line OP is perpendicular to the tangent line of the edge line at the M point, the included angle alpha between the straight line OM and the straight line ON is obtained, the first laser is moved, and the first rotating part is controlled to rotate at an angle alpha towards one side close to the straight line ON, so that the P point is coincident with the N point, and the straight line OP is perpendicular to the tangent line of the edge line at the N point.

Drawings

FIG. 1 is a schematic diagram of a photo-curing printing device according to an embodiment;

FIG. 2 is a schematic diagram of a first light source module according to an embodiment;

FIG. 3 is a schematic diagram of a motion assembly according to an embodiment;

FIG. 4 is a schematic diagram of a second light source assembly according to an embodiment;

FIG. 5 is a schematic diagram of a first spot initial position according to an embodiment;

FIG. 6 is a schematic diagram of a first spot movement process according to an embodiment;

FIG. 7 is a schematic view of a printed ply in an embodiment;

FIG. 8 is a flow chart of a photo-curing printing method in an embodiment.

Reference numerals: 100. a photo-curing printing device; 10. a first light source assembly; 11. a first rotating member; 12. a first laser; 13. a first beam expander; 14. a first focusing mirror; 15. a first light spot; 20. a second light source assembly; 21. a second rotating member; 22. a second laser; 23. a second beam expander; 24. a second focusing mirror; 25. vibrating mirror; 26. a second light spot; 30. a motion assembly; 31. a first moving member; 32. a second moving member; 40. a liquid tank; 41. printing the ply; 411. printing an edge; 412. filling the region; 413. edge lines; 42. a liquid surface; 50. a supporting plate; 60. a scraper; 70. a fixed frame; 80. a spot detector; 90. and a control module.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

The photo-curing printing apparatus 100 and the printing method provided in some embodiments of the present application are described in detail below.

As shown in fig. 1 and 2, in one embodiment, a photo-curing printing apparatus 100 is provided, comprising a liquid tank 40 and a first light source assembly 10;

wherein the liquid tank 40 is used for containing liquid photosensitive material; the first light source assembly 10 is disposed opposite to the liquid surface 42 of the liquid photosensitive material, the first light source assembly 10 includes a first laser 12 and a first rotating member 11, the first laser 12 is configured to generate a light beam for solidifying the liquid photosensitive material, and irradiates the light beam onto the liquid surface 42 of the liquid photosensitive material to form a first light spot 15, and the first rotating member 11 is connected to the first laser 12 and is configured to drive the first laser 12 to rotate, so that the first light spot 15 rotates around its center as a center of a circle.

The photo-curing printing apparatus 100 includes a liquid tank 40 and a first light source assembly 10, wherein the liquid tank 40 is used for containing a liquid photosensitive material, the first light source assembly 10 is used for providing a light source required by curing the liquid photosensitive material, the first laser 12 generates a light beam, the light beam irradiates a liquid surface 42 irradiating the liquid photosensitive material to form a first light spot 15, and the liquid photosensitive material in a region where the first light spot 15 is located is rapidly polymerized and is changed from a liquid state to a solid state; the first rotating member 11 is configured to drive the first laser 12 to rotate about an axis thereof, thereby driving the first light spot 15 to rotate about a center as a center of a circle.

In the printing and curing process, the first light source assembly 10 is firstly moved along a preset printing path, so that the first light spots 15 sequentially irradiate the liquid photosensitive material on the preset printing path to form a complete printing sheet 41; then curing and printing a plurality of printing layers 41 from bottom to top, and sequentially stacking and connecting the plurality of printing layers 41 to form a preset printing product. However, when the printed sheet 41 is cured, the shape of the edge of the printed sheet 41 varies, and the curvature varies at each point on the edge. To ensure edge accuracy on each print ply 41, the inner area enclosed by the edge line 413 of the print ply 41 is refilled when the edge line 413 of the print ply 41 is cured first when the print ply 41 is cured.

Referring to fig. 5 and 6, when curing the edge of the print ply 41, firstly, obtaining the edge line 413 of the print ply 41, selecting the Q point on the edge line 413 as an initial point, selecting the P point on the edge of the first light spot 15 as a printing point, moving the first laser 12 so that the printing point P point coincides with the initial point Q point, rotating the first laser 12 by the first rotating member 11 so that the edge of the first light spot 15 is tangential to the edge line 413 of the print ply 41, that is, the tangent line of the edge line 413 at the Q point is perpendicular to the straight line OP, and then moving the first laser 12 so that the printing point P point sequentially passes through the edge line 413 of the print ply 41, thereby completing the curing of the edge line 413 of the print ply 41 and forming the printing edge 411; therefore, the photo-curing printing device 100 rotates the first light spot 15 through the first rotating member 11, so that the edge of the first light spot 15 can be tangent to the edge line 413 of the printing sheet 41 with different shapes, the same point on the edge of the first light spot 15 is ensured to irradiate and cure the edge line 413 of the printing sheet 41 all the time, the influence of the first light spot 15 with different shapes on the precision of the printing edge 411 is avoided, and the surface precision and quality of a printed product are improved.

In this embodiment, the first rotating member 11 is a coaxial rotating device, and the first rotating member 11 is coaxially connected to the first laser 12, so as to drive the first laser 12 to rotate about its axis, thereby driving the first light spot 15 to rotate about its center as a center of a circle.

Specifically, as shown in fig. 2 and 3, in an embodiment, the photo-curing printing apparatus 100 further includes a moving assembly 30, and the first light source assembly 10 is movably disposed on the moving assembly 30, so that the first light spot 15 can move along a preset printing track on the liquid surface 42 of the liquid photosensitive material.

The moving assembly 30 includes a first moving member 31 and a second moving member 32, a first sliding groove is formed in the first moving member 31 along a second direction, a first sliding block is formed in the first light source assembly 10, the first sliding groove is slidably matched with the first sliding block, and the first light source assembly 10 can move on the first moving member 31 along the second direction. The second moving member 32 is provided with a second sliding groove along a third direction, the first moving member 31 is provided with a second sliding block, the second sliding groove is in sliding fit with the second sliding block, and the first moving member 31 can move on the second moving member 32 along the third direction, so that the first light source assembly 10 is driven to move along the third direction, and the second direction is perpendicular to the third direction. Therefore, the moving assembly 30 drives the first light source assembly 10 to move relative to the liquid tank 40 through the first moving member 31 and the second moving member 32, so that the first light spot 15 can move along a preset printing track on the liquid surface 42 of the liquid photosensitive material.

Specifically, as shown in fig. 2, in an embodiment, the photo-curing printing apparatus 100 further includes a light spot detector 80, and the light spot detector 80 is configured to detect the size and shape of the first light spot 15. The spot typically produced by the laser is not circular, resulting in different curvatures at points on the edge of the first spot 15 and different printing accuracies for the edge line 413 of the print swath 41. The shape and size of the first spot 15, including size information such as radius, area, curvature, etc. of the first spot, can be detected using the spot detector 80. If the first light spot 15 is elliptical, a point with the largest curvature on the circumference of the ellipse may be selected as a printing point, that is, a major axis end point of the ellipse is taken as a printing point P point, so that the curvature of the first light spot 15 at the P point is larger than the curvature of any point on the edge line 413, and by moving the printing point of the first light spot 15 along the edge line 413, each point on the edge line 413 is sequentially cured and irradiated, so as to obtain a printing edge 411 completely coincident with the preset edge line 413. In addition, by monitoring the shape of the first light spot 15 in real time, that is, detecting the curvature of each point on the edge of the first light spot 15, it is ensured that the point with the largest curvature on the edge of the first light spot 15 is always used as a printing point, and the shape of the first light spot 15 is prevented from being changed to influence the printing precision of the edge line 413.

Further, as shown in fig. 2, in an embodiment, the first light source assembly 10 further includes a first beam expander 13 and a first focusing mirror 14, the first beam expander 13 is used for adjusting the size of the first light spot 15, and the first light spot 15 sequentially passes through the first beam expander 13 and the first focusing mirror 14 to irradiate on the liquid surface of the liquid photosensitive material. The first beam expander 13 adjusts the size of the first light spot 15 by adjusting the distance between the beam expander and the first laser 12 in the beam expander, that is, by reducing the area size of the first light spot 15, the accuracy of the printing edge is improved. The first focusing mirror 14 is used for focusing the parallel light beam emitted by the first beam expander 13, so that the first light spot 15 is formed by irradiation on the liquid surface of the liquid photosensitive material.

The first beam expander 13 is a collimating beam expander, that is, a collimator and a beam expander are disposed in the first beam expander 13, and a beam generated by the first laser 12 passes through the collimator and then the beam expander, so as to prevent the beam generated by the first laser 12 from being directly expanded to damage the beam expander.

Specifically, as shown in fig. 1 and 4, in an embodiment, the photo-curing printing apparatus 100 further includes a second light source assembly 20, where the second light source assembly 20 includes a second laser 22 and a galvanometer 25, the second laser 22 is used to generate a light beam for curing the liquid photosensitive material, the galvanometer 25 is used to reflect the light beam generated by the second laser 22 onto the liquid surface 42 of the liquid photosensitive material to form a second light spot 26, an area of the second light spot 26 is larger than an area of the first light spot 15, and a reflection angle of the galvanometer 25 is adjustable. The second light source assembly 20 is used for irradiating the enclosed area surrounded by the printing edge 411 on the cured printing sheet 41, and the second light spot 26 can be moved along the preset printing path by adjusting the reflection angle of the galvanometer 25. Since the moving speed of the galvanometer 25 is high, the area of the second light spot 26 is large, and the second light source assembly 20 can effectively improve the printing speed of the entire printing sheet 41. Therefore, the photo-curing printing device 100 uses the first light source group to cure the edge line 413 of the printing sheet 41, and uses the second light source group to cure the sealing area surrounded by the printing edge 411 on the filling printing sheet 41, so that the printing precision of the edge line 413 of the printing sheet 41 can be ensured, and the printing speed of the whole printing sheet 41 can be improved.

Further, as shown in fig. 1 and 4, in an embodiment, the second light source assembly 20 further includes a second rotating member 21, where the second rotating member 21 is connected to the second laser 22, and the second rotating member 21 is configured to drive the second laser 22 to rotate, so that the second light spot 26 rotates around its center as a center. The second rotating member 21 can improve the printing accuracy of the filled region 412 by rotating the second spot 26.

In this embodiment, the second rotating member 21 is a coaxial rotating device.

With continued reference to fig. 1 and 4, in one embodiment, the second light source assembly 20 further includes a second beam expander 23 and a second focusing mirror 24, and the light beam generated by the second laser 22 sequentially passes through the second beam expander 23, the second focusing mirror 24, and a galvanometer 25 to reach the liquid surface of the liquid photosensitive material, and the second beam expander 23 is used to adjust the size of the second light spot 26. The second beam expander 23 adjusts the size of the second light spot 26 by adjusting the distance between the beam expander and the second laser 22 in the beam expander, and the second focusing mirror 24 is used for focusing the parallel light beam emitted by the second beam expander 23, so as to irradiate the liquid surface 42 of the liquid photosensitive material to form the second light spot 26.

The second beam expander 23 is a collimated beam expander, that is, a collimator and a beam expander are disposed in the second beam expander 23, and the beam generated by the second laser 22 passes through the collimator and then the beam expander, so as to avoid damaging the beam expander due to direct beam expansion of the beam generated by the second laser 22.

In this embodiment, the second light source assembly 20 is disposed on a support plate, and a light hole is disposed on the support plate for passing the light beam generated by the first laser.

Specifically, as shown in fig. 1, in an embodiment, a tray 50 is disposed in the liquid tank 40, the tray 50 is used for holding the cured printed product, the direction in which the liquid surface 42 of the liquid photosensitive material is disposed opposite to the first light source assembly 10 is a first direction, and the tray 50 can move in the first direction in the liquid tank 40. In the printing process, the first printing layer sheet 41 is connected with the supporting plate 50, other printing layer sheets 41 are connected with the last printing layer sheet 41 at a time, the bearing surface on the supporting plate 50 is parallel to the liquid surface 42 of the liquid photosensitive material, and the distance between the bearing surface on the supporting plate 50 and the liquid surface 42 of the liquid photosensitive material is equal to the thickness of the next printing layer sheet 41. That is, when the first print sheet 41 is cured, the distance between the receiving surface on the pallet 50 and the liquid surface 42 is the thickness of the first print sheet 41, and when the second print sheet 41 is cured, the pallet 50 is moved away from the liquid surface by a distance equal to the thickness of the second print sheet 41, and so on.

The photo-curing printing apparatus 100 further includes a first driving member connected to the tray 50 for driving the tray 50 to move in the liquid tank 40 along the first direction.

In this embodiment, the pallet 50 is provided with a metal plate, the first printed sheet 41 is placed directly on the metal plate, and the metal plate is provided with a through hole for the uncured liquid photosensitive material on the metal plate to flow out of the metal plate.

Specifically, as shown in fig. 1, in an embodiment, the photo-curing printing apparatus 100 further includes a doctor blade 60, where the doctor blade 60 is capable of moving in parallel with respect to the liquid surface 42 of the liquid photosensitive material, and a surface of the doctor blade 60 facing the liquid surface 42 of the liquid photosensitive material is a doctor blade end surface, and the doctor blade end surface is parallel to the printing sheet 41. The scraper 60 is used for scraping the liquid level 42, and before each printing layer sheet 41 is irradiated and solidified, the scraper 60 is used for scraping the liquid level 42, so that the thickness uniformity and the surface smoothness of each printing layer sheet 41 are ensured, and the printing quality of a printing product is improved.

The photo-curing printing device 100 further comprises a second driving member connected with the doctor blade 60 for driving the doctor blade 60 to move in parallel relative to the printing sheet 41.

Still further, as shown in fig. 1, in an embodiment, the photo-curing printing apparatus 100 further includes a control module 90, and the first light source assembly 10, the second light source assembly 20, the moving assembly 30, the first driving member and the second driving member are all electrically connected to the control module 90. The control module 90 is used to control various parameters of movement of the first light source assembly 10, the second light source assembly 20, the movement assembly 30, the first driving member, and the second driving member. Such as the rotational angle of the first light source assembly 10, the print path, the rotational angle of the second light source assembly 20, the moving path of the moving assembly 30, the moving distance of the first driving member, the moving distance of the second driving member, etc.

In this embodiment, the photo-curing printing apparatus 100 further includes a fixing frame 70, and the liquid tank 40, the first light source assembly 10, the second light source assembly 20, the pallet 50, and the doctor blade 60 are all disposed on the fixing frame 70.

As shown in fig. 5, 7 and 8, in one embodiment, there is provided a photo-curing printing method, using a photo-curing printing apparatus 100, comprising the steps of:

s1: acquiring an edge line 413 of the print ply 41;

s2: selecting a P point on the edge of the first light spot 15 as a printing point, wherein the center of the first light spot 15 is an O point, and moving the first laser 12 to enable the P point to move along an edge line 413, wherein the position of the P point on the edge line 413 is a Q point;

s3: the first rotating member 11 is controlled to rotate the first laser 12 such that the straight line OP is perpendicular to the tangent line of the edge line 413 at the point Q at any one time.

The above-mentioned photo-curing printing method uses the above-mentioned photo-curing printing apparatus 100, the photo-curing printing apparatus 100 includes a liquid tank 40 and a first light source assembly 10, wherein the liquid tank 40 is used for holding a liquid photosensitive material, the first light source assembly 10 is used for providing a light source required by curing the liquid photosensitive material, the first laser 12 generates a light beam, the light beam irradiates the liquid surface 42 irradiating the liquid photosensitive material to form a first light spot 15, the liquid photosensitive material in the area where the first light spot 15 is located is rapidly polymerized, and the liquid photosensitive material is changed from a liquid state to a solid state; the first rotating member 11 is configured to drive the first laser 12 to rotate about its axis, thereby driving the first light spot 15 to rotate about a circle.

When the edge of the printing sheet 41 is cured, firstly acquiring an edge line 413 of the printing sheet 41, selecting a Q point on the edge line 413 as an initial point, selecting a P point on the edge of a first light spot 15 as a printing point, moving a first laser 12 to enable the printing point P point to coincide with the initial point Q point, rotating the first laser 12 by utilizing a first rotating piece 11 to enable the edge of the first light spot 15 to be tangential to the edge line 413 of the printing sheet 41, namely enabling the tangent line of the edge line 413 at the Q point to be perpendicular to a straight line OP, and then moving the first laser 12 to enable the printing point P point to sequentially pass through the edge line 413 of the printing sheet 41, so that the curing of the edge line 413 of the printing sheet 41 is completed and a printing edge 411 is formed; therefore, the photo-curing printing device 100 rotates the first light spot 15 through the first rotating member 11, so that the edge of the first light spot 15 can be tangent to the edge line of the printing sheet 41 with different shapes, the same point on the edge of the first light spot 15 is ensured to irradiate and cure the edge line 413 of the printing sheet 41 all the time, the influence of the first light spot 15 with different shapes on the precision of the printing edge 411 is avoided, and the surface precision and quality of a printed product are improved.

Specifically, in an embodiment, the curvatures of the points on the edge of the first light spot 15 are not equal, and the point P is the point with the largest curvature on the edge of the first light spot 15. Thus, the first spot 15 may be an elliptical spot, and the printed point P is the point of maximum curvature on the circumference of the ellipse, which is the end point of the major axis of the ellipse.

Specifically, as shown in fig. 6, in an embodiment, in step S2 and step S3, the method further includes the following steps: two adjacent points ON the edge line 413 are sequentially cured according to the following method, the two adjacent points ON the edge line 413 are set as M points and N points, the P points are coincident with the M points, a straight line OP is perpendicular to a tangent line of the edge line 413 at the M points, an included angle alpha between the straight line OM and the straight line ON is obtained, the first laser 12 is moved, and meanwhile the first rotating piece 11 is controlled to rotate to a side close to the straight line ON by an angle alpha, so that the P points are coincident with the N points, and the straight line OP is perpendicular to a tangent line of the edge line 413 at the N points.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

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" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A photo-curing printing apparatus, comprising:

a liquid tank for holding a liquid photosensitive material;

the first light source component is arranged opposite to the liquid level of the liquid photosensitive material and comprises a first laser and a first rotating piece, wherein the first laser is used for generating a light beam for solidifying the liquid photosensitive material and irradiating the light beam onto the liquid level of the liquid photosensitive material to form a first light spot, the first rotating piece is connected with the first laser and is used for driving the first laser to rotate, so that the first light spot rotates with the center of the first light spot as the center of a circle, and the first light source component is used for irradiating the edge area of the solidified printing sheet;

the spot detector is used for detecting the size and the shape of the first spot so as to select the point with the maximum circumferential curvature of the first spot as a printing point;

the second light source component is used for irradiating a closed area surrounded by the printing edge on the solidified printing sheet.

2. The light-curable printing device of claim 1, further comprising a motion assembly, wherein the first light source assembly is movably disposed on the motion assembly such that the first light spot is movable along a predetermined print trajectory over a surface of the liquid photosensitive material.

3. The light-curable printing device of claim 1, wherein the first light source assembly further comprises a first beam expander and a first focusing mirror, the first beam expander is used for adjusting the size of the first light spot, and the first light spot sequentially passes through the first beam expander and the first focusing mirror to irradiate on the liquid surface of the liquid photosensitive material.

4. The light-curable printing device of claim 1, wherein the second light source assembly includes a second laser for generating a light beam for curing the liquid photosensitive material and a galvanometer, the second light spot being formed by the galvanometer reflecting the light beam generated by the second laser onto a liquid surface of the liquid photosensitive material, the reflection angle of the galvanometer being adjustable.

5. The light-cured printing device of claim 4, wherein the second light source assembly further comprises a second rotating member, the second rotating member being coupled to the second laser, the second rotating member being configured to rotate the second laser such that the second spot rotates about its center.

6. The light-cured printing device of claim 5, wherein the second light source assembly further comprises a second beam expander and a second focusing mirror, wherein the light beam generated by the second laser sequentially passes through the second beam expander, the second focusing mirror and the galvanometer to reach the liquid surface of the liquid photosensitive material, and the second beam expander is used for adjusting the size of the second light spot.

7. The light-cured printing device according to claim 1, wherein a supporting plate is arranged in the liquid tank and is used for containing the cured printing product, the direction in which the liquid surface of the liquid photosensitive material is opposite to the first light source assembly is a first direction, and the supporting plate can move in the liquid tank along the first direction.

8. The photo-curing printing device as defined in claim 1, further comprising a doctor blade capable of moving in parallel with respect to the liquid surface of the liquid photosensitive material, wherein a side of the doctor blade facing the liquid photosensitive material surface is a doctor blade end surface, and wherein the doctor blade end surface is parallel to the printing sheet.

9. A photo-curing printing method, characterized by using the photo-curing printing apparatus as claimed in any one of claims 1 to 8, comprising the steps of:

s1: acquiring an edge line of the printing ply;

s3: and controlling the first rotating piece to rotate the first laser, so that a straight line OP is perpendicular to a tangent line of the edge line at the point Q at any moment.

10. The method of claim 9, wherein the curvatures of the respective points on the first spot edge are not equal, and the P point is the point with the largest curvature on the first spot edge;