Control method of DLP photocuring 3D printing equipment and 3D printing equipment

Abstract

The invention discloses a control method of DLP photocuring 3D printing equipment and the 3D printing equipment, a DMD chip synchronously and dynamically changes projection patterns according to two-dimensional image data of a current layer, so that the DMD chip forms a plurality of framing projection patterns which roll along with time, each resin point on each layer of printing section is formed by overlapping the plurality of framing projection patterns, and a plurality of resin points on each layer of printing section are formed by overlapping the plurality of framing projection patterns. And each resin point is exposed by a plurality of different DMD micromirrors on the DMD chip to form dynamic many-to-one mapping. In a pattern rolling process, one dead pixel can generate wrong exposure on a plurality of passing resin points in a period of time, but each resin point is influenced by the dead pixel for a very short time, and each resin point is exposed by a large number of normal micromirrors, so that the influence of the dead pixel on the quality of a printed workpiece can be avoided. Besides, according to the control method of the DLP photocuring 3D printing equipment, the DMD chip synchronously and dynamically changes the projection pattern in an inclined scanning exposure mode, so that the DMD chip has higher projection precision, and then the forming precision of a printed workpiece is improved.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing, and in particular to a control method and a 3D printing device for DLP photopolymerization 3D printing. Background Technology

[0002] With the rapid development of additive manufacturing technology, DLP (Digital Permeation) 3D printing technology, with its advantages of high forming accuracy, good surface finish, and fast printing speed, has been widely used in various fields such as dental restoration, jewelry casting, precision molds, and cultural and creative products. DLP 3D printing technology uses liquid photosensitive resin as the printing material. It achieves layer-by-layer curing by irradiating the resin with light of a specific wavelength (such as ultraviolet light) to induce a polymerization reaction. Its processing efficiency, manufacturing cost, and operational stability directly determine the breadth and depth of its industrial applications.

[0003] In existing DLP photopolymerization printing equipment, each micromirror of the DMD chip has a static one-to-one correspondence with a pixel on the build plane. That is, each micromirror is responsible for curing a fixed position on the resin surface. During exposure, the entire layer pattern is projected at once, and all micromirrors switch states simultaneously, causing the resin layer to cure at the corresponding position. Because some DMD chips have a few defective pixels (micromirrors that cannot switch on and off properly) before leaving the factory, or under high light power radiation, some defective pixels may appear on the DMD chip over a period of time. If the DMD chip has constantly lit or constantly dark defective pixels, it will lead to serious quality problems in the printed workpiece. Specifically, constantly lit defective pixels: the corresponding micromirror always emits light during each layer printing. If the resin corresponding to this defective pixel does not need to be cured, it will cause over-curing of the resin at that point or the formation of redundant structures. Constantly dark defective pixels: the corresponding micromirror never emits light during each layer printing. If the resin corresponding to this point should be cured, it will cause the resin at that point to not cure, resulting in missing printing material, forming holes or breaks in the layers. Because defects occur in the same locations in each layer, these defects accumulate layer by layer, eventually leading to structural failure of the printed part, such as insufficient strength, incorrect shape, or complete breakage. Therefore, there is an urgent need to propose a new technical solution to address these problems. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a control method for a DLP photopolymerization 3D printing device and the 3D printing device itself.

[0005] This invention provides a control method for a DLP photopolymerization 3D printing device. The DLP photopolymerization 3D printing device includes a DLP projection system for layer-by-layer printing and curing. The DLP projection system is equipped with a DMD chip. The control method for the DLP photopolymerization 3D printing device includes: S1. Before printing, import the 3D model data to be printed, configure the printing parameters according to the 3D model data, and divide the 3D model data into multiple layers of 2D image data. S2, When printing each layer, the lifting mechanism is activated to move the forming platform vertically to the current layer printing position. Then, the drive mechanism is activated to move the DLP projection system from the printing start position along the scanning direction. While the DLP projection system moves, the DMD chip dynamically changes the projection pattern according to the current layer's two-dimensional image data, so that the DMD chip forms multiple frame projection patterns that change over time. Each resin point on the cross-section of the printed workpiece in each layer is formed by superimposing multiple frame projection patterns until the current layer printing is completed. S3, after completing the printing of the current layer, the drive mechanism drives the DLP projection system to reset to the printing start position, starts the lifting mechanism to raise the forming platform to the current printing layer peel-off position, and then the lifting mechanism drives the forming platform to descend to the next printing layer position; S4. Repeat steps S2 to S3 until all layers are printed.

[0006] Preferably, the DMD chip comprises a micromirror array formed by DMD micromirrors in different rows and columns. Specifically, "the DMD chip dynamically changes the projection pattern synchronously based on the current layer's two-dimensional image data" means: During the movement of the DLP projection system, the on / off state of each DMD micromirror in the micromirror array is dynamically controlled according to the current layer two-dimensional image data, so that the position and number of DMD micromirrors forming the projection pattern change synchronously over time.

[0007] Preferably, the dynamic control is specifically achieved by: obtaining the coordinate data of the area to be cured on the resin surface based on the current layer's two-dimensional image data; During the movement of the DLP projection system, the coordinate data of the center of the light spot projected onto the resin surface by each DMD micromirror is acquired in real time. The DMD micromirrors whose center coordinate data falls within the coordinate data of the area to be cured are controlled to be in the on state, and other DMD micromirrors are controlled to be in the off state.

[0008] Preferably, the DMD chip synchronously and dynamically changes the projected pattern using a tilted scanning exposure method.

[0009] Preferably, "the DMD chip is exposed by tilt scanning" specifically means that the DMD chip is configured to be tilted at a preset angle θ with respect to the scanning direction, and the tilt angle θ ranges from 3° to 10°.

[0010] Preferably, before “configuring printing parameters based on 3D model data”, step S1 further includes: preprocessing the 3D model data, the preprocessing including adjusting the model placement direction, scaling the model scale, adding supports or one of the following.

[0011] Preferably, the printing parameters include the layer thickness of each printed section, the moving speed of the drive mechanism, the exposure intensity and exposure time of the DLP projection system, the flipping speed of the DMD chip, and the support type.

[0012] Preferably, "current layer printing position" specifically refers to the position between the forming platform and the material tank at a distance equal to the current printing layer thickness.

[0013] Preferably, after all layers of printing are completed, the lifting mechanism is activated to lift the forming platform, the printed workpiece is removed, the material tank is cleaned, and photosensitive resin is added to the material tank to the rated level or rated quantity.

[0014] Another aspect of the present invention provides a DLP photopolymerization 3D printing device, comprising: A material tank assembly includes a material tank for holding liquid photosensitive resin, and a light-transmitting plate is provided at the bottom of the material tank; The molding platform, located above the material trough assembly, is used to mold 3D printed parts; A lifting mechanism is used to drive the molding platform to move vertically; A DLP projection system is located below the material tank, and the DLP projection system includes a DMD chip; A drive mechanism is used to drive the DLP projection system to move linearly in the horizontal plane; The control system is signal-connected to the drive mechanism, the DLP projection system, and the lifting mechanism. The control system is configured to execute the control method of the DLP photopolymerization 3D printing equipment described in any of the above technical solutions.

[0015] This invention discloses a control method for a DLP photopolymerization 3D printing device. The DMD chip dynamically changes its projection pattern synchronously based on the current layer's 2D image data, forming multiple frame-by-frame projection patterns that change over time. Each resin dot on the printed workpiece cross-section is formed by the superposition of multiple frame-by-frame projection patterns. Each resin dot on the printed cross-section is exposed by multiple different DMD micromirrors on the DMD chip, thus forming a dynamic many-to-one mapping. Therefore, a defective dot may cause incorrect exposure to multiple resin dots during pattern scrolling for a period of time, but each resin dot is affected by the defective dot for a very short time, and each resin dot is exposed by a large number of normal micromirrors, thereby avoiding the impact of defective dots on the quality of the printed workpiece. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the control method of the DLP photopolymerization 3D printing equipment in a specific embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the principle of rolling scan exposure for a DMD chip. Figure 3A schematic diagram illustrating the principle of tilt scanning exposure for a DMD chip; Figure 4 A schematic diagram illustrating the principle of frame projection pattern for tilted scrolling scanning of a DMD chip; Figure 5 This is a schematic diagram of the structure of the DLP photopolymerization 3D printing equipment in a specific embodiment of the present invention. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more comprehensive description of the invention will be provided below in conjunction with specific embodiments. Preferred embodiments of the invention are given in the specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0018] The terms "optional" and similar expressions used in this invention refer to embodiments of the invention that may provide certain beneficial effects in certain circumstances. However, other embodiments may also be optional in the same or other circumstances. Furthermore, the description of one or more optional embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this invention.

[0019] like Figure 1 As shown, this invention provides a control method for a DLP photopolymerization 3D printing device. The DLP photopolymerization 3D printing device includes a DLP projection system for layer-by-layer printing and curing. The DLP projection system is equipped with a DMD chip, specifically, the DMD chip includes a micromirror array formed by DMD micromirrors in different rows and columns. The control method for the DLP photopolymerization 3D printing device includes the following steps: S1. Before printing, import the 3D model data to be printed, configure the printing parameters according to the 3D model data, and divide the 3D model data into multiple layers of 2D image data.

[0020] Specifically, the printing parameters include key parameters such as the layer thickness of each printed section, the moving speed of the drive mechanism, the exposure intensity and exposure time of the DLP projection system, the flipping speed of the DMD chip, and the support type.

[0021] Preferably, before “configuring printing parameters based on 3D model data”, step S1 further includes: preprocessing the 3D model data, the preprocessing including adjusting the model placement direction, scaling the model scale, adding supports or one of the following.

[0022] It can be understood that multi-layered two-dimensional image data, which is segmented from three-dimensional model data, can be obtained by slicing the three-dimensional model data along the vertical direction according to the layer thickness of each printed section.

[0023] S2, When printing each layer, the lifting mechanism is activated to move the forming platform vertically to the current layer printing position. Then, the drive mechanism is activated to move the DLP projection system from the printing start position along the scanning direction. While the DLP projection system moves, the DMD chip dynamically changes the projection pattern according to the current layer's two-dimensional image data, so that the DMD chip forms multiple frame projection patterns that change over time. Each resin point on the cross-section of the printed workpiece in each layer is formed by superimposing multiple frame projection patterns until the current layer printing is completed.

[0024] "Current layer printing position" specifically refers to the distance between the forming platform and the material tank that is equal to the current printing layer thickness. During the first layer printing, this distance is equal to the current printing layer thickness between the forming platform and the bottom of the material tank. During other layer printing, this distance is equal to the current printing layer thickness between the workpiece attached to the forming platform and the bottom of the material tank.

[0025] In this invention, "the DMD chip synchronously and dynamically changes the projection pattern according to the current layer two-dimensional image data" specifically means that during the movement of the DLP projection system, the on or off state of each DMD micromirror in the micromirror array is dynamically controlled according to the current layer two-dimensional image data, so that the position and number of DMD micromirrors forming the projection pattern change synchronously over time.

[0026] In a specific embodiment, the dynamic control is implemented in the following way: Obtain the coordinate data of the area to be cured on the resin surface based on the current layer's two-dimensional image data; During the movement of the DLP projection system, the coordinate data of the center of the light spot projected onto the resin surface by each DMD micromirror is acquired in real time. The DMD micromirrors whose center coordinate data falls within the coordinate data of the area to be cured are controlled to be in the on state, and other DMD micromirrors are controlled to be in the off state.

[0027] The coordinate data of the area to be cured on the resin surface refers to the area of ​​the resin surface to be cured within the material tank corresponding to the current two-dimensional image data of the printed layer. It can be understood that because the drive mechanism moves the DLP projection system, the position of each DMD micromirror in the micromirror array of the DMD chip changes over time, and the center coordinates of the light spot projected onto the resin surface by each DMD micromirror also change over time. By real-time determination of whether the center coordinate data of the light spot projected onto the resin surface by each DMD micromirror falls into the coordinate data of the area to be cured, the DMD micromirrors whose center coordinate data falls into the coordinate data of the area to be cured are controlled to be in the on state, and other DMD micromirrors are controlled to be in the off state. This allows for real-time dynamic changes in the position and number of DMD micromirrors forming the projection pattern on the DMD chip, enabling the DMD chip to form multiple frame-by-frame projection patterns that change over time, ultimately achieving the rolling scan exposure of the DLP projection system.

[0028] The principle of rolling scan exposure is illustrated as follows: Figure 2 As shown, the DMD chip displays a two-dimensional pattern (such as a slit spot or a local pattern), such as... Figure 2 As shown on the left, the red rectangular area represents the two-dimensional pattern projected from the DMD chip onto the resin printing surface, such as... Figure 2 As shown on the right, the pattern rolls at a constant speed along the scanning direction (e.g., the X-axis). Multiple frame projection patterns (multiple red rectangular areas) displayed at different times overlap to form the area within the yellow box, ensuring that the exposure energy received by each point on the resin printing cross-section is the sum of the exposure energy integrated over time. For clarity, each frame projection pattern is simplified to a red rectangular area of ​​the same size in the figure. In practical applications, each frame projection pattern changes according to the shape of the printing cross-section. Due to the pattern movement, each point on the printing cross-section is exposed by multiple different DMD micromirrors on the DMD chip, thus forming a dynamic many-to-one mapping.

[0029] The control method of the DLP photopolymer 3D printing equipment of this invention adopts a rolling scanning printing method, which can avoid the impact of bad spots on the quality of printed workpieces. Specific advantages are as follows: 1) In rolling scanning, the correspondence between DMD micromirrors and resin dots is time-varying. A bad spot (e.g., constantly lit) will cause incorrect exposure to multiple resin dots passed by during pattern rolling, but each resin dot is only affected by the bad spot for a very short time, thus the impact of the bad spot is dispersed. Conversely, in existing DLP photopolymer printing equipment, bad spots consistently affect the same resin dot. 2) The total exposure energy of each resin dot is the total exposure integral it receives during pattern rolling. Due to the continuous movement of the pattern, resin dots are exposed by a large number of normal micromirrors, and the energy contributed by bad spots is very small: if a bad spot is constantly lit, its extra exposure energy will be diluted by the average of the normal exposure integrals, insufficient to cause significant over-curing. If a bad spot is constantly dark, its missing exposure energy can be compensated by the exposure of other normal micromirrors, because the dot will also be exposed by other micromirrors. Therefore, a very small number of bad spots will not cause a resin dot to be completely under-cured or over-cured. 3) In rolling scan, each resin dot is exposed by multiple micromirrors, which is equivalent to introducing spatial redundancy. Even if a few micromirrors fail, other normal micromirrors can still provide correct exposure, similar to the principle of error dispersion. Traditional DLP, on the other hand, does not have redundancy; each dot relies on only one micromirror. 4) Rolling scan combined with continuous exposure makes resin curing a gradual process. The erroneous exposures caused by bad pixels are dispersed over time, preventing the concentrated formation of intralayer defects and avoiding the superposition of interlayer defects.

[0030] Preferably, the DMD chip synchronously and dynamically changes the projected pattern using a tilted scanning exposure method, such as... Figure 3 As shown, the DMD chip tilt scanning exposure can be achieved by configuring the DMD chip at a tilt angle θ with the scanning direction, so that the DMD micromirrors in different rows and columns are at non-orthogonal angles to the scanning trajectory. Specifically, the tilt angle θ ranges from 3° to 10°. This tilt scanning method allows the DMD chip to achieve higher projection accuracy, thereby improving the forming accuracy of the printed workpiece. For example, when the DMD chip changes the projection pattern using tilt rolling scanning exposure, the framed projection patterns projected onto the resin surface at different times are as follows: Figure 4 As shown in the diagram. For clarity, each frame projection pattern is simplified to a red rectangular area of ​​the same size. In practical applications, each frame projection pattern will vary depending on the shape of the printed cross-section.

[0031] S3, after completing the printing of the current layer, the drive mechanism drives the DLP projection system to reset to the printing start position, starts the lifting mechanism to raise the forming platform to the current printing layer peel-off position, and then the lifting mechanism drives the forming platform to descend to the next printing layer position; S4. Repeat steps S2 to S3 until all layers are printed.

[0032] Preferably, after all layers have been printed, the following steps are also included: S5, start the lifting mechanism to lift the forming platform, remove the printed workpiece, clean the material tank and add photosensitive resin to the material tank to the rated level or rated quantity.

[0033] In specific embodiments, the printed workpiece can be removed manually or automatically. Cleaning the material tank and adding photosensitive resin can also be done manually or with automated equipment.

[0034] In the control method of the DLP photopolymerization 3D printing equipment of this invention, the DMD chip synchronously and dynamically changes the projection pattern according to the current layer's two-dimensional image data, so that the DMD chip forms multiple frame-by-frame projection patterns that change over time. Each resin point on the cross-section of the printed workpiece in each layer is formed by the superposition of multiple frame-by-frame projection patterns. Each resin point on the printed cross-section is exposed by multiple different DMD micromirrors on the DMD chip, thus forming a dynamic many-to-one mapping. A bad point will cause incorrect exposure to multiple resin points it passes through for a period of time during the pattern rolling process, but each resin point is only affected by the bad point for a very short time, thereby avoiding the impact of bad points on the quality of the printed workpiece. In addition, in the control method of the DLP photopolymerization 3D printing equipment of this invention, the DMD chip synchronously and dynamically changes the projection pattern by means of tilted scanning exposure, so that the DMD chip has higher projection accuracy, thereby improving the forming accuracy of the printed workpiece.

[0035] In another aspect, the present invention also provides a DLP photopolymerization 3D printing device, such as... Figure 5 As shown, the DLP photopolymerization 3D printing equipment includes a base 1, a material tank assembly 2, a forming platform 3, a lifting mechanism 4, a DLP projection system 5, and a drive mechanism 6, all mounted on the base 1. The material tank assembly 2 includes a material tank 21 containing liquid photosensitive resin, with a light-transmitting plate at the bottom. Specifically, the light-transmitting plate can be a light-transmitting glass base plate. The material tank assembly 2 also includes a mounting structure for mounting the material tank 21 on the base 1. Above the material tank assembly 2 is the forming platform 3 for forming 3D printed parts. The lifting mechanism 4 drives the forming platform 3 to move vertically. The DLP projection system 5 is located below the material tank 21 and includes a DMD chip. The drive mechanism drives the DLP projection system 5 to move linearly in a horizontal plane. In one specific embodiment, the DLP projection system 5 is slidably connected to a linear guide rail 6, and the drive mechanism drives the DLP projection system 5 to move on the linear guide rail 6 at a predetermined speed. The DLP photopolymer 3D printing equipment also includes a control system, which is signal-connected to the drive mechanism, the DLP projection system 5 and the lifting mechanism 4. The control system is configured to perform the control method of the DLP photopolymer 3D printing equipment as described above.

[0036] Compared with existing technologies, the photopolymerization 3D printing equipment in this invention uses mobile DLP projection technology. A drive mechanism propels the projection lens module to move linearly in the horizontal plane, enabling large-format photopolymerization 3D printing. This improves the overall printing accuracy of the product while maintaining the printing precision of the DLP projection system itself. Furthermore, in the control method of the DLP photopolymerization 3D printing equipment in this invention, the DMD chip synchronously and dynamically changes the projection pattern according to the current layer's two-dimensional image data, causing the DMD chip to form multiple frame-by-frame projection patterns that change over time. Each resin point on the cross-section of the printed workpiece in each layer is formed by the superposition of multiple frame-by-frame projection patterns. Each resin point on the printed cross-section is exposed by multiple different DMD micromirrors on the DMD chip, thus forming a dynamic many-to-one mapping. A bad point will cause incorrect exposure to multiple resin points it passes through during the pattern scrolling process, but each resin point is only affected by the bad point for a very short time, thus avoiding the impact of bad points on the quality of the printed workpiece.

[0037] Furthermore, in the control method of the DLP photopolymerization 3D printing equipment of the present invention, the DMD chip synchronously and dynamically changes the projection pattern by means of tilt scanning exposure, so that the DMD chip has higher projection accuracy, thereby improving the forming accuracy of the printed workpiece.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A control method for a DLP photopolymerization 3D printing device, the DLP photopolymerization 3D printing device comprising a DLP projection system for layer-by-layer printing and curing, the DLP projection system being equipped with a DMD chip, characterized in that, The control method for the DLP photopolymerization 3D printing equipment includes: S1. Before printing, import the 3D model data to be printed, configure the printing parameters according to the 3D model data, and divide the 3D model data into multiple layers of 2D image data. S2, When printing each layer, the lifting mechanism is activated to move the forming platform vertically to the current layer printing position. Then, the drive mechanism is activated to move the DLP projection system from the printing start position along the scanning direction. While the DLP projection system moves, the DMD chip dynamically changes the projection pattern according to the current layer's two-dimensional image data, so that the DMD chip forms multiple frame projection patterns that change over time. Each resin point on the cross-section of the printed workpiece in each layer is formed by superimposing multiple frame projection patterns until the current layer printing is completed. S3, after completing the printing of the current layer, the drive mechanism drives the DLP projection system to reset to the printing start position, starts the lifting mechanism to raise the forming platform to the current printing layer peel-off position, and then the lifting mechanism drives the forming platform to descend to the next printing layer position; S4. Repeat steps S2 to S3 until all layers are printed.

2. The control method for the DLP photopolymerization 3D printing equipment according to claim 1, characterized in that, A DMD chip comprises a micromirror array formed by DMD micromirrors in different rows and columns. Specifically, "the DMD chip dynamically changes its projection pattern synchronously based on the current layer's two-dimensional image data" means: During the movement of the DLP projection system, the on / off state of each DMD micromirror in the micromirror array is dynamically controlled according to the current layer two-dimensional image data, so that the position and number of DMD micromirrors forming the projection pattern change synchronously over time.

3. The control method for the DLP photopolymerization 3D printing equipment according to claim 2, characterized in that, The dynamic control is specifically implemented in the following ways: Obtain the coordinate data of the area to be cured on the resin surface based on the current layer's two-dimensional image data; During the movement of the DLP projection system, the coordinate data of the center of the light spot projected onto the resin surface by each DMD micromirror is acquired in real time. The DMD micromirrors whose center coordinate data falls within the coordinate data of the area to be cured are controlled to be in the on state, and other DMD micromirrors are controlled to be in the off state.

4. The control method for the DLP photopolymerization 3D printing equipment according to claim 1, characterized in that, The DMD chip synchronously and dynamically changes the projected pattern using a tilted scanning exposure method.

5. The control method for the DLP photopolymerization 3D printing equipment according to claim 4, characterized in that, "DMD chip exposed by tilt scanning" specifically refers to configuring the DMD chip at a preset tilt angle θ with respect to the scanning direction, where the tilt angle θ ranges from 3° to 10°.

6. The control method for the DLP photopolymerization 3D printing equipment according to claim 1, characterized in that, Before "configuring printing parameters based on 3D model data", step S1 also includes: preprocessing the 3D model data, which includes adjusting the model placement direction, scaling the model scale, and adding supports or one of the following:

7. The control method for the DLP photopolymerization 3D printing equipment according to claim 1, characterized in that, Printing parameters include the layer thickness of each printed section, the moving speed of the drive mechanism, the exposure intensity and exposure time of the DLP projection system, the flipping speed of the DMD chip, and the support type.

8. The control method for the DLP photopolymerization 3D printing equipment according to claim 1, characterized in that, "Current layer printing position" specifically refers to the position between the forming platform and the material tank, which is the distance of the current printing layer thickness.

9. The control method for the DLP photopolymerization 3D printing equipment according to claim 1, characterized in that, After all layers of printing are completed, start the lifting mechanism to lift the forming platform, remove the printed workpiece, clean the material tank, and add photosensitive resin to the material tank to the rated level or rated quantity.

10. A DLP photopolymerization 3D printing device, characterized in that, Also includes: A material tank assembly includes a material tank for holding liquid photosensitive resin, and a light-transmitting plate is provided at the bottom of the material tank; The molding platform, located above the material trough assembly, is used to mold 3D printed parts; A lifting mechanism is used to drive the molding platform to move vertically; A DLP projection system is located below the material tank, and the DLP projection system includes a DMD chip; A drive mechanism is used to drive the DLP projection system to move linearly in the horizontal plane; The control system is signal-connected to the drive mechanism, the DLP projection system, and the lifting mechanism, and is configured to perform a control method for the DLP photopolymerization 3D printing equipment according to any one of claims 1 to 9.

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