Three-dimensional printing device, three-dimensional printing method, and computer device

Abstract

This application provides a 3D printing apparatus, a 3D printing method, and a computer device. The method includes: setting a marking pattern facing at least one radiation source on a forming platform; the marking pattern includes at least one mark, each mark corresponding to a radiation source, and the mark and the projection of the radiation source on the forming platform at least partially overlapping; an imaging device acquiring the position information of the marks on the forming platform to obtain a first image; a processor generating a second image based on the first image, the second image representing the position information of the at least one radiation source; and the processor controlling the at least one radiation source to irradiate a building material layer according to the second image to form a 3D object. The technical solution provided by this application ensures precise control of each radiation source, thereby improving the forming accuracy of the 3D object.

Description

[Technical Field]

[0001] This application relates to the field of 3D printing technology, and in particular to a 3D printing apparatus, a 3D printing method, and a computer device. [Background Technology]

[0002] The main process of the three-dimensional object forming method is to obtain a digital model of the three-dimensional object, slice and layer the digital model, and process and convert the data of each slice layer to obtain the printing data of each slice layer. The printing device prints layer by layer according to the printing data of the slice layer to form slice layers, and superimposes multiple slice layers to create a three-dimensional object.

[0003] In 3D printing technology, multiple radiation sources are placed above the forming platform. These sources heat various areas on the platform to promote the solidification of powder material. Temperature is typically monitored by temperature sensors, and the monitored temperature heatmap is fed back to a controller. The controller then adjusts the power of the radiation sources in the corresponding areas based on the heatmap and pre-set radiation source position information. However, due to factors such as installation tolerances of the radiation sources or a lack of correlation between the radiation source position information and the different areas of the forming platform, the area irradiated by the radiation source on the platform may not match the position information of the radiation source in the controller. This affects the precise control of each radiation source and reduces the forming accuracy of the 3D object. [Summary of the Invention]

[0004] In view of this, embodiments of this application provide a three-dimensional printing apparatus, a three-dimensional printing method, and a computer device to solve the technical problem in the prior art where the area irradiated by the radiation source on the forming platform does not match the position information of the radiation source recorded in the controller, thus affecting the precise control of each radiation source, thereby improving the forming accuracy of three-dimensional objects.

[0005] The first aspect provides a three-dimensional printing apparatus, comprising:

[0006] A preheating component, the preheating component including at least one radiation source;

[0007] A molding platform is provided with a marking pattern facing the radiation source. The marking pattern includes at least one mark, each mark corresponding to a radiation source, and the mark at least partially overlaps with the projection of the radiation source onto the molding platform.

[0008] An imaging device is used to acquire the position information of the mark on the molding platform to obtain a first image, the first image being used to generate a second image, the second image representing the position information of the at least one radiation source;

[0009] The radiation source is used to irradiate the building material layer under the control of the processor based on the second image to form a three-dimensional object.

[0010] The second aspect provides a 3D printing method, including:

[0011] A marking pattern facing at least one radiation source is set on a molding platform. The marking pattern includes at least one mark, each mark corresponding to one of the radiation sources, and the mark and the projection of the radiation source on the molding platform at least partially overlap.

[0012] The imaging device acquires the position information of the marks on the molding platform to obtain a first image;

[0013] The processor generates a second image based on the first image, the second image representing the location information of the at least one radiation source;

[0014] The processor controls the at least one radiation source to irradiate the construction material layer based on the second image to form a three-dimensional object.

[0015] A third aspect provides a 3D printing method based on a 3D printing device, the 3D printing device including at least one radiation source, a forming platform, and an imaging device. A marking pattern facing the radiation source is disposed on the forming platform. The marking pattern includes at least one mark, each mark corresponding one-to-one with the radiation source, and the mark and the projection of the radiation source onto the forming platform at least partially overlap. The imaging device is used to acquire the positional information of the marks on the forming platform to obtain a first image. The method is applied to a computer device, and the method includes:

[0016] A second image is generated based on the first image, and the second image represents the location information of the at least one radiation source.

[0017] The at least one radiation source is controlled to irradiate the construction material layer according to the second image to form a three-dimensional object.

[0018] The fourth aspect provides a computer device comprising: one or more processors; a memory; and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions that, when executed by the computer device, cause the computer device to perform the three-dimensional printing method of the third aspect.

[0019] The fifth aspect provides a non-transitory computer-readable storage medium comprising a stored program, wherein, when the program is executed, it controls a computer device containing the non-transitory computer-readable storage medium to perform the three-dimensional printing method of the third aspect.

[0020] In the technical solution provided in this application embodiment, a marking pattern that coincides with the radiation source in the projection direction is set on the forming platform to represent the position information of the radiation source. The position information of the marking pattern obtained by the imaging device is used as the basis for controlling the radiation source, so that the area irradiated by the radiation source on the forming platform matches the position information of the radiation source in the processor, ensuring the precise control of each radiation source, thereby improving the forming accuracy of the three-dimensional object. [Attached Image Description]

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A block diagram of a 3D printing device provided for the prior art;

[0023] Figure 2 This is a schematic diagram of the structure of a 3D printing device provided in an embodiment of this application;

[0024] Figure 3 for Figure 2 Schematic diagram of the preheating component;

[0025] Figure 4 for Figure 2 Schematic diagram of the structure of the intermediate forming platform and preheating components;

[0026] Figure 5 A flowchart of a 3D printing method provided in this application embodiment;

[0027] Figure 6 A schematic diagram of a non-transitory computer-readable storage medium provided for an embodiment of this application;

[0028] Figure 7 This is a schematic diagram of a computer device provided in an embodiment of this application.

[0029] Figure label:

[0030] 1-Powder material; 2-Powder supply component; 21-Powder spreader; 22-Lifter; 23-Powder storage chamber; 231-Support plate; 3-Forming platform; 31-Marker; 32-Calibration mark; 4-Lifting mechanism; 5-Heating component; 6-Material dispenser; 7-Preheating component; 71-Radiation source; 8-Guide rail; 9-Controller; 10-Imaging device; L0-Construction material layer; 100-Non-transitory computer-readable storage medium; 101-Program; 200-Computer equipment; 201-Processor; 202-Memory; 203-Computer program.

Detailed Implementation Methods

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The terms “first,” “second,” etc. (if present) in the specification, claims, and drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such use of data can be interchanged where appropriate so that the implementations of this application described herein can be implemented, for example, in sequences other than those illustrated or described herein.

[0033] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application.

[0034] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0035] Figure 1 A block diagram of a 3D printing apparatus provided for the prior art, such as Figure 1As shown, in current 3D printing technology, multiple radiation sources are placed above the molding platform to heat various areas of the platform, promoting the solidification of powder material. Temperature is typically monitored by temperature sensors, and the monitored temperature heat map is fed back to a controller. The controller then adjusts the power of the radiation source in the corresponding area based on the temperature heat map and pre-set radiation source position information. However, due to factors such as installation tolerances of the radiation sources or the lack of correlation between the radiation source position information and the various areas of the molding platform, [further issues may arise]. Figure 1 As shown, this can lead to a mismatch between the area irradiated by the radiation source on the forming platform and the position information of the radiation source in the controller, affecting the precise control of the radiation source and thus reducing the forming accuracy of the three-dimensional object.

[0036] To address the aforementioned technical problems, embodiments of this application provide a three-dimensional object printing apparatus, a three-dimensional printing method, and a computer device, which match the area irradiated by the radiation source on the forming platform with the position information of the radiation source in the processor, ensuring precise control of each radiation source and thereby improving the forming accuracy of the three-dimensional object.

[0037] Figure 2 This is a schematic diagram of the structure of a 3D printing device provided in an embodiment of this application. Figure 3 for Figure 2 Schematic diagram of the preheating component. Figure 4 for Figure 2 A structural schematic diagram of the molding platform and preheating components is shown below. Figures 2 to 4 As shown, the 3D printing apparatus includes: a preheating component 7, a forming platform 3, and an imaging device 10. The preheating component 7 includes at least one radiation source 71; a marking pattern facing the radiation source 71 is provided on the forming platform 3, wherein the marking pattern may include at least one mark 31, the mark 31 corresponds one-to-one with the radiation source 71, and the mark 31 and the projection of the radiation source 71 on the forming platform 3 at least partially overlap; the imaging device 10 is used to acquire the position information of the mark 31 on the forming platform 3 to obtain a first image, the first image is used to generate a second image, the second image representing the position information of at least one radiation source 71; the radiation source 71 is used to irradiate the building material layer L0 under the control of the processor according to the second image to form a three-dimensional object.

[0038] The processor may include a processing unit and a controller 9, wherein the processing unit is not specifically shown in the figure. The processing unit is used to generate a second image based on a first image, the second image representing the position information of at least one radiation source 71; the controller 9 is used to control at least one radiation source 71 to irradiate the construction material layer L0 according to the second image to form a three-dimensional object.

[0039] As an alternative, the 3D printing apparatus includes a processor. In this case, the processor is a processing device located within the 3D printing apparatus; for example, the processor may include a Central Processing Unit (CPU), a Microcontroller Unit (MCU), or a System on Chip (SoC).

[0040] As an alternative, the processor can be located within a computer device; that is, the computer device includes a processor, which is a processing device located within the computer device. For example, the processor may include a CPU, MCU, or SoC. In this case, the computer device can communicate with the 3D printing apparatus. For example, the computer device may include a computer, server, or workstation.

[0041] In one embodiment, such as Figure 3 As shown, the preheating component 7 includes one or more radiation sources 71. In this embodiment, the preheating component 7 includes multiple radiation sources 71. Figure 3 The preheating component 7 is described as including 10 radiation sources 71 as an example. In other embodiments, the preheating component 7 may include any number of radiation sources 71. The arrangement of the radiation sources 71 can be set as needed to ensure uniformity of the temperature supplied to the surface of the building material layer L0. For example, Figure 3 The multiple radiation sources 71 are arranged in an array, which ensures the uniformity of the temperature supplied to the surface of the building material layer L0.

[0042] In one embodiment, the molding platform 3 is used to support the building material layer L0 and the three-dimensional object before the powder material is spread, such as Figure 4 As shown, a marking pattern facing the radiation source 71 is provided on the molding platform 3. The marking pattern includes at least one mark 31, each mark 31 corresponding one-to-one with the radiation source 71, and at least partially overlapping with the projection of the radiation source 71 onto the molding platform 3. If the preheating component 7 includes multiple radiation sources 71, the marking pattern can correspondingly include multiple marks 31. The arrangement of the multiple marks 31 can be based on the arrangement of the multiple radiation sources 71, ensuring a one-to-one correspondence between the marks 31 and the radiation source 71. Figure 4 The positions of multiple markers 31 can be arranged in an array.

[0043] In one embodiment, such as Figure 4 As shown, the marking pattern may also include calibration marks 32, which at least partially overlap with the projection of the imaging device 10 onto the forming platform 3. For example, as Figure 4As shown, the calibration mark 32 is located in the middle of the marking pattern, and multiple marks 31 are arranged in an array around the calibration mark 32.

[0044] In one embodiment, the marking pattern may be made of a material different from that of the forming platform 3; for example, the marking pattern may be made of a radiation-absorbing material.

[0045] In one embodiment, the marking pattern can be directly printed onto the molding platform 3 during processing, or the marking pattern can be placed directly onto the molding platform 3 after the molding platform 3 is installed in the 3D printing device.

[0046] In one embodiment, such as Figure 2 As shown, the 3D printing apparatus also includes a powder supply component 2, which provides powder material to the forming platform 3 to form a building material layer L0 on the forming platform 3. The powder supply component 2 includes a powder storage chamber 23, a lifter 22, and a powder spreader 21. A movable support plate 231 is provided at the bottom of the powder storage chamber 23, and the lifter 22 is connected to the support plate 231. The powder storage chamber 23 stores powder material 1. The lifter 22 is used to raise or lower the support plate 231; for example, the lifter 22 can move the support plate 231 up or down. Figure 2 The powder spreader 21 moves vertically upwards or downwards towards the forming platform 3 to spread the powder material 1 stored in the powder storage chamber 23 onto the forming platform 3 to form the building material layer L0. For example, the powder spreader 21 can move in the direction of the forming platform 3 to spread the powder material 1 stored in the powder storage chamber 23 onto the forming platform 3 to form the building material layer L0. Figure 2 The powder spreader 21 moves in the left-right direction. If it moves from left to right, it indicates that the powder spreader 21 is moving towards the molding platform 3. In this case, the powder spreader 21 can be used to spread the powder material 1 stored in the powder storage chamber 23 onto the molding platform 3 to form the building material layer L0. If it moves from right to left, it indicates that the powder spreader 21 is moving away from the molding platform 3. In this case, the powder spreader 21 is ready to perform the next operation of spreading the powder material 1 stored in the powder storage chamber 23 onto the molding platform 3. In one possible implementation, the powder spreader 21 may include a powder spreading roller or a scraper, etc.

[0047] In one embodiment, such as Figure 2As shown, the 3D printing apparatus also includes a material dispenser 6, which is used to spray liquid material onto the building material layer L0 to form slice layers of the 3D object. The material dispenser 6 can be an inkjet printhead, which can be a single-channel printhead or a multi-channel printhead. The number of printheads can be determined based on the type of liquid material used and the amount of liquid material to be applied. For example, when the liquid material includes functional materials of different colors, different colors of liquid material are sprayed through different printheads or different channels of the same printhead. For example, when the amount of liquid material to be applied is large and the volume of a single ink droplet is insufficient, multiple printheads or multiple channels can be used simultaneously to spray the same type of material to improve printing efficiency.

[0048] In one embodiment, such as Figure 2 As shown, the 3D printing apparatus also includes a heating component 5, which is used to heat the build material layer L0 on which the liquid material is sprayed after the liquid material is sprayed from the material dispenser 6. The heating component 5 may include at least one of an ultraviolet lamp, an infrared lamp, a microwave emitter, a heating wire, a heating plate, and a heating element. In this embodiment, the specific type of heating component 5 selected is related to the type of liquid material and / or the type of powder material. Figure 2 As shown, in one possible implementation, the 3D printing apparatus further includes a guide rail 8, with heating components 5 and a material dispenser 6 mounted on the guide rail 8, and the heating components 5 and the material dispenser 6 are movable on the guide rail 8. For example, one material dispenser 6 and two heating components 5 can be provided on the guide rail 8. Specifically, the heating components 5, the material dispenser 6, and the heating components 5 are sequentially mounted on the guide rail 8 and are movable along the guide rail 8. Figure 2 It can move left and right in the middle. For example, a material dispenser 6 and a heating element 5 can be installed on the guide rail 8. The heating element 5 can be located on one side of the material dispenser 6, for example... Figure 2 The material distributor 6 can be located on the left or right side. In practical applications, the number and position of the heating components 5, as well as the number and position of the material distributor 6, can be set as needed, and this embodiment does not limit this.

[0049] In one embodiment, the preheating component 7 is used to provide radiant or thermal energy to preheat the building material layer L0, thereby facilitating the curing of the liquid material and the powder material in contact with the liquid material in the molding area of ​​the molding platform 3 to form slices of a three-dimensional object. The radiation source 71 may include at least one of an ultraviolet lamp, an infrared lamp, a microwave emitter, a heating wire, a heating plate, and a heating plate. In this embodiment, the specific form of the preheating component 7 is selected depending on the type of liquid material and / or powder material. When the liquid material and / or powder material undergoes a photopolymerization reaction, the preheating component 7 provides radiant energy. For example, if the preheating component 7 is an ultraviolet lamp, the radiant energy is ultraviolet radiation, and the preheating component 7 can initiate a photopolymerization reaction of the liquid material and / or powder material through ultraviolet radiation. When the liquid material and / or powder material undergoes a thermal polymerization reaction, the preheating component 7 provides thermal energy. For example, if the preheating component 7 includes an infrared lamp, a microwave, a heating wire, a heating plate, or a heating plate, the preheating component 7 can initiate a thermal polymerization reaction of the liquid material and / or powder material through thermal energy. In one possible implementation, the preheating component 7 can be installed above the molding platform 3, for example, the preheating component 7 can be installed on top of the molding chamber of the 3D printing device.

[0050] In one embodiment, the imaging device 10 can be used to detect the temperature of the molding platform 3 and / or the temperature of the build material layer L0. For example, the imaging device 10 may include a thermal imager or a temperature monitor. The imaging device 10 is mounted on top of the molding chamber of the 3D printing apparatus. Figure 3 As shown, the imaging device 10 can be mounted on the preheating component 7, and the imaging device 10 can be positioned on the same horizontal plane as the multiple radiation sources 71. In other embodiments, the imaging device 10 can also be mounted in other locations as needed, which are not limited in this application embodiment.

[0051] In one embodiment, the controller 9 is used to control the operation of at least one of the powder supply component 2, the heating component 5, the material dispenser 6, the preheating component 7, and the imaging device 10. For example, the imaging device 10 feeds back the monitored temperature to the controller 9, and the controller 9 controls the amount of energy provided by the preheating component 7 and / or the heating component 5 based on the information fed back by the imaging device 10.

[0052] In one embodiment, the 3D printing apparatus further includes a lifting mechanism 4, which is connected to the forming platform 3. The lifting mechanism 4 can be used to drive the forming platform 3 to rise or fall; for example, the lifting mechanism 4 can drive the forming platform 3 along... Figure 2 Vertical movement within, to achieve Figure 2The vertical direction of the molding platform 3 can be raised or lowered. When the molding platform 3 is in a designated position, the controller 9 can control the powder supply component 2 to form a building material layer L0 on the molding platform 3, and control the material distributor 6 to selectively spray liquid material onto the building material layer L0 to form a slice layer of the three-dimensional object at that designated position. Subsequently, the molding platform 3... Figure 2 The controller 9 continues to control the powder supply component 2 and the material distributor 6 to perform powder spreading and inkjet spraying actions after each movement of the forming platform 3, thereby forming a slice layer of the three-dimensional object at each position. The slice layers formed at all positions are stacked layer by layer to form a complete three-dimensional object.

[0053] In the technical solution provided in this application embodiment, a marking pattern that coincides with the radiation source in the projection direction is set on the forming platform to represent the position information of the radiation source. The position information of the marking pattern obtained by the imaging device is used as the basis for controlling the radiation source, so that the area irradiated by the radiation source on the forming platform matches the position information of the radiation source in the processor, ensuring the precise control of each radiation source, thereby improving the forming accuracy of the three-dimensional object.

[0054] Figure 5 A flowchart of a 3D printing method provided in this application embodiment is shown below. Figure 5 As shown, the method includes:

[0055] Step S1: Set a marking pattern facing at least one radiation source on the forming platform, wherein the marking pattern includes at least one mark, each mark corresponds to a radiation source, and the mark and the projection of the radiation source on the forming platform at least partially overlap.

[0056] In one embodiment, such as Figure 4 As shown, the molding platform 3 is provided with marking patterns facing multiple radiation sources 71. The marking patterns include multiple marks 31, each of which corresponds to a radiation source 71, and the projections of the marks 31 and the radiation sources 71 on the molding platform 3 at least partially overlap.

[0057] In one embodiment, step S1 may specifically include: printing a marking pattern onto the molding platform 3 during the processing of the molding platform 3; or, placing the marking pattern onto the molding platform 3 after the molding platform 3 is installed on the 3D printing device.

[0058] In one embodiment, the marking pattern may be made of a material different from that of the forming platform 3; for example, the marking pattern may be made of a radiation-absorbing material.

[0059] In one embodiment, the arrangement of the multiple markers 31 can be based on the arrangement of the multiple radiation sources 71. The arrangement of the multiple radiation sources 71 can be set as needed to ensure the temperature uniformity of the material layer L0 irradiated with radiation. For example, Figure 3 If the multiple radiation sources 71 are arranged in an array, then... Figure 4 The multiple markers 31 can be arranged in an array. Since there is a mapping relationship between the specific position of the radiation source 71 and the area irradiated by the forming platform 3, by setting physical markers (i.e., marker patterns) on the forming platform 3 to replace the specific position of the radiation source 71, the physical coordinate system of the forming platform 3 is associated with the position coordinate system of the control radiation source 71. This ensures that the area irradiated by the radiation source 71 on the forming platform 3 matches the position information of the radiation source 71 in the processor, thereby improving the forming accuracy of the three-dimensional object.

[0060] Step S2: The imaging device acquires the position information of the mark on the molding platform to obtain the first image.

[0061] Specifically, after the installation position of the imaging device 10 is determined, the imaging device 10 can acquire the position information of the marks 31 on the molding platform 3. Since the material of the marks 31 is different from the material of the molding platform 3, the imaging device can form a thermal map based on the acquired temperature of the marks 31 and the temperature of the molding platform 3, and obtain the physical coordinates of each mark 31 on the molding platform 3 based on the thermal map, so as to obtain a first image representing the relative positional relationship between the marks 31 and the molding platform 3. Among them, the position information of the marks 31 on the molding platform 3 in step S2 may include the physical coordinates of the marks 31 on the molding platform 3.

[0062] In one embodiment, the marking pattern may further include a calibration mark 32, which at least partially overlaps with the projection of the imaging device 10 onto the molding platform 3. The mounting position of the imaging device 10 can be adjusted using the calibration mark 32. Prior to step S2, the method further includes: the imaging device 10 acquiring the calibration mark 32 on the molding platform 3 to obtain a third image; comparing the third image with the calibration mark 32 on the molding platform 3 to obtain a comparison result; the comparison result can be used to adjust the mounting position of the imaging device 10. If the comparison result indicates that the calibration mark 32 has shifted and / or deformed, it indicates that the mounting position of the imaging device 10 is improper, and the mounting position of the imaging device 10 can be adjusted. For example, specifically, the shape of the calibration mark 32 in the third image can be compared with the shape of the calibration mark 32 on the forming platform 3, and the position of the calibration mark 32 in the third image can be compared with the position of the calibration mark 32 on the forming platform 3; if the shape of the calibration mark 32 in the third image is different from the shape of the calibration mark 32 on the forming platform 3, and / or the position of the calibration mark 32 in the third image is different from the position of the calibration mark 32 on the forming platform 3, then it is determined that the comparison result includes deformation and / or displacement of the calibration mark 32, and the installation position of the imaging device 10 can be adjusted. Specifically, if the shape of the calibration mark 32 in the third image differs from the shape of the calibration mark 32 on the forming platform 3 (for example, the calibration mark 32 in the third image is elliptical while the calibration mark 32 on the forming platform 3 is circular), then the comparison result is determined to be that the calibration mark 32 is deformed. Similarly, if the position of the calibration mark 32 in the third image differs from the position of the calibration mark 32 on the forming platform 3 (for example, the position of the calibration mark 32 in the third image is off-center from the center of the forming platform 3, while the calibration mark 32 on the forming platform 3 is centered), then the comparison result is determined to be that the calibration mark 32 is offset. The third image can be a heatmap.

[0063] Step S3: The processor generates a second image based on the first image, which represents the location information of at least one radiation source.

[0064] In this embodiment, step S3 may specifically include: the processor's processing unit converts the physical coordinates of each marker 31 on the molding platform 3 into physical coordinates associated with the radiation source 71 and the molding platform 3 according to the mapping relationship between the radiation source 71 and the marker 31, to obtain a second image. The second image represents the position information of multiple radiation sources 71 associated with the molding platform 3. The position information of the radiation source 71 may include the physical coordinates associated with the radiation source 71 and the molding platform 3.

[0065] Step S4: The processor controls at least one radiation source to irradiate the construction material layer according to the second image to form a three-dimensional object.

[0066] In one embodiment, the imaging device 10 acquires the temperature of at least one region of the building material layer L0. In step S4, the processor controls at least one radiation source to irradiate the building material layer based on the second image. Specifically, the processor's controller 9 controls the power of the radiation source in the corresponding region based on the temperature of at least one region of the building material layer L0 acquired by the imaging device 10 and the position information of the radiation source in the second image, so that the radiation source 71 irradiates the building material layer L0 at that power. Specifically, if the controller 9 detects that the temperature of at least one region of the building material layer L0 is not equal to the set temperature, it adjusts the power of the radiation source 71 in the corresponding region based on the position information of the radiation source 71 in the second image to control the radiation source 71. The formation of the three-dimensional object in step S4 specifically includes: forming the building material layer L0 on the molding platform 3; the controller 9 controlling the material dispenser 6 to spray liquid material onto the building material layer L0 based on layer printing data to form slice layers; repeating the steps from forming the building material layer to forming the slice layers, so that the obtained multiple slice layers are stacked layer by layer to form a three-dimensional object.

[0067] During the formation of the slice layer, the controller 9 controls the radiation source 71 to irradiate the construction material layer L0 sprayed with liquid material according to the second image, thereby helping the liquid material and the powder material in contact with the liquid material in the forming area of ​​the forming platform 3 to solidify and form the slice layer of the three-dimensional object.

[0068] In one embodiment, the original data of a three-dimensional object can be acquired by scanning, and a three-dimensional model of the object can be obtained by performing three-dimensional modeling based on the original data; or, a three-dimensional object model can be designed and constructed to obtain a digital model of the three-dimensional object. The digital model is then converted to a format recognizable by slicing software to generate a first model. For example, formats recognizable by slicing software may include STL, PLY, or WRL formats. The first model is then sliced ​​using slicing software to obtain slice layer image data, which is then processed to obtain layer printing data representing the three-dimensional object. The layer printing data may include information representing the object's shape and / or information representing the object's color. The controller 9 can control the material dispenser 6 to spray liquid material onto the construction material layer L0 based on the layer printing data to form the slice layer.

[0069] In this embodiment, the powder material is a powdered material particle. This embodiment does not limit the powder material; the powder material may not polymerize with the liquid material, nor may it polymerize on its own. Alternatively, the powder material may polymerize with the liquid material or may polymerize on its own, and can be flexibly modified according to actual needs. Optionally, the powder material may include at least one of polystyrene (PS), polyvinyl chloride (PVC), polyacrylonitrile, acrylonitrile-styrene-acrylate copolymer (ASA), polyamide (PA), polyester, polyurethane (PU), polylactic acid, poly(meth)acrylate, poly(meth)acrylate, polyvinyl fluoride, chlorinated polyolefin, hydroxyl-containing polyvinyl alcohol (PVA), cellulose, and modified cellulose.

[0070] In this embodiment, the liquid material at least partially dissolves the powder material, and / or the liquid material undergoes thermal polymerization and / or photopolymerization, and / or the liquid material reacts with the powder material in a polymerization reaction. This embodiment does not limit the liquid material, as long as it can ultimately solidify the powder material sprayed with the liquid material. For example, the liquid material may contain an energy absorber that absorbs provided energy and converts it into heat, thereby melting and solidifying the powder material in contact with it; or, the liquid material may be a photocurable material containing a photocurable component that can dissolve the powder material, and under provided energy such as radiation, a photoinitiator initiates a polymerization reaction of the photocurable component, thereby entangled and solidifying the dissolved powder molecules; or, the liquid material may be a thermocurable material containing a thermocurable component, and under provided energy such as heat, a thermal initiator initiates a polymerization reaction of the thermocurable component, forming a polymer that encapsulates and solidifies the powder material; or, the liquid material may have an active component that reacts with the powder material, and under provided energy, an initiator initiates a polymerization reaction between the liquid material and the powder material. The liquid material may also include additives, such as initiators, leveling agents, defoamers, surfactants, and other conventionally known materials. Initiators are used to initiate reactions in the liquid material; depending on the type of liquid material, initiators may be photoinitiators, free radical initiators, anionic initiators, cationic initiators, etc. Leveling agents improve the fluidity of the liquid material and its wetting properties on the powder material, while adjusting the surface tension of the liquid material to ensure proper printing; this is not limited in this embodiment. Defoamers are mainly used to prevent foaming of the liquid material; defoamers may be, for example, silicone defoamers, polyether defoamers, fatty acid ester defoamers, etc. Surfactants are mainly used to control the wettability, penetration, and surface tension of the liquid material on the powder material; surfactants may be, for example, anionic surfactants, nonionic surfactants, and amphoteric surfactants.

[0071] In the technical solution provided in this application embodiment, a marking pattern that coincides with the radiation source in the projection direction is set on the forming platform to represent the position information of the radiation source. The position information of the marking pattern obtained by the imaging device is used as the basis for controlling the radiation source, so that the area irradiated by the radiation source on the forming platform matches the position information of the radiation source in the processor, ensuring the precise control of each radiation source, thereby improving the forming accuracy of the three-dimensional object.

[0072] This application also provides a non-transitory computer-readable storage medium. Figure 6 A schematic diagram of a non-transitory computer-readable storage medium provided in an embodiment of this application, as shown below. Figure 6 As shown, the non-transitory computer-readable storage medium 100 includes a stored program 101, which, when the program 101 is running, controls the computer device where the non-transitory computer-readable storage medium 100 is located to execute the above-described 3D printing method.

[0073] This application also provides a computer device, which includes one or more processors; a memory; and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions that, when executed by the computer device, cause the computer device to perform the above-described 3D printing method.

[0074] Figure 7 A schematic diagram of a computer device provided in an embodiment of this application, such as... Figure 7 As shown, the computer device 200 of this embodiment includes: a processor 201, a memory 202, and a computer program 203 stored in the memory 202 and executable on the processor 201. When the processor 201 executes the computer program 203, it implements the 3D printing method in the embodiment. To avoid repetition, it will not be described in detail here.

[0075] Computer device 200 can be a desktop computer, laptop, handheld computer, cloud server, or other computing device. The computer device may include, but is not limited to, a processor 201 and a memory 202. Those skilled in the art will understand that... Figure 7 This is merely an example of computer device 200 and does not constitute a limitation on computer device 200. It may include more or fewer components than shown, or combine certain components, or different components. For example, computer device may also include input / output devices, network access devices, buses, etc.

[0076] The processor 201 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0077] The memory 202 can be an internal storage unit of the computer device 200, such as a hard disk or RAM of the computer device 200. The memory 202 can also be an external storage device of the computer device 200, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the computer device 200. Furthermore, the memory 202 can include both internal and external storage units of the computer device 200. The memory 202 is used to store computer programs and other programs and data required by the computer device. The memory 202 can also be used to temporarily store data that has been output or will be output.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A three-dimensional printing device, characterized in that, include: A preheating component, the preheating component including at least one radiation source; A molding platform is provided with a marking pattern facing the radiation source. The marking pattern includes at least one mark, each mark corresponding to a radiation source, and the mark and the projection of the radiation source on the molding platform at least partially overlap. The marking pattern is made of a material different from that of the molding platform. An imaging device is used to acquire the position information of the mark on the molding platform to obtain a first image, the first image being used to generate a second image, the second image representing the position information of the at least one radiation source; The radiation source is used to irradiate the building material layer under the control of the processor based on the second image to form a three-dimensional object.

2. The apparatus according to claim 1, characterized in that, The processor includes: A processing unit is configured to generate the second image based on the first image; A controller for controlling the at least one radiation source to irradiate the building material layer based on the second image.

3. The apparatus according to claim 1, characterized in that, The apparatus further includes a powder supply component for supplying powder material to the molding platform to form the building material layer on the molding platform.

4. The apparatus according to claim 1, characterized in that, The marking pattern also includes calibration marks, which at least partially overlap with the projection of the imaging device onto the molding platform.

5. The apparatus according to claim 1, characterized in that, The device also includes a material dispenser for spraying liquid material onto the building material layer to form slices of the three-dimensional object.

6. The apparatus according to claim 5, characterized in that, The device also includes at least one heating element; The heating component is used to heat the building material layer on which the liquid material has been sprayed after the liquid material is sprayed from the material dispenser.

7. The apparatus according to claim 1, characterized in that, The preheating component is installed above the molding platform and on top of the molding chamber of the 3D printing device.

8. The apparatus according to claim 1, characterized in that, The imaging device is mounted on top of the molding chamber of the 3D printing device.

9. A three-dimensional printing method, characterized in that, include: A marking pattern facing at least one radiation source is set on a molding platform. The marking pattern includes at least one mark, each mark corresponding to one of the radiation sources, and the mark and the projection of the radiation source on the molding platform at least partially overlap. The marking pattern is made of a material different from that of the molding platform. The imaging device acquires the position information of the marks on the molding platform to obtain a first image; The processor generates a second image based on the first image, the second image representing the location information of the at least one radiation source; The processor controls the at least one radiation source to irradiate the construction material layer based on the second image to form a three-dimensional object.

10. The method according to claim 9, characterized in that, Setting a marking pattern facing at least one radiation source on the molding platform includes: The marking pattern is printed on the forming platform during processing; or After the molding platform is installed on the 3D printing device, the marking pattern is placed on the molding platform.

11. The method according to claim 9 or 10, characterized in that, The imaging device acquires the position information of the marks on the molding platform to obtain a first image, including: The imaging device generates a thermal image based on the temperature of the marker and the temperature of the molding platform, and obtains the physical coordinates of each marker on the molding platform based on the thermal image to obtain a first image representing the relative positional relationship between the marker and the molding platform. The positional information of the marker on the molding platform includes the physical coordinates of the marker on the molding platform.

12. A three-dimensional printing method, characterized in that, The 3D printing method is based on a 3D printing device, which includes at least one radiation source, a forming platform, and an imaging device. A marking pattern facing the radiation source is disposed on the forming platform. The marking pattern includes at least one mark, each mark corresponding one-to-one with the radiation source, and the mark and the projection of the radiation source onto the forming platform at least partially overlap. The imaging device is used to acquire the positional information of the marks on the forming platform to obtain a first image. The marking pattern is made of a material different from that of the forming platform. The method is applied to a computer device and includes: A second image is generated based on the first image, and the second image represents the location information of the at least one radiation source. The at least one radiation source is controlled to irradiate the construction material layer according to the second image to form a three-dimensional object.

13. The method according to claim 12, characterized in that, The marking pattern further includes calibration marks, and the imaging device is further used to acquire the calibration marks on the molding platform to obtain a third image; the method further includes: The third image is compared with the calibration mark on the molding platform to obtain a comparison result, which is used to adjust the installation position of the imaging device.

14. The method according to claim 12, characterized in that, The step of generating a second image based on the first image includes: Based on the mapping relationship between the radiation source and the marker, the physical coordinates of each marker on the molding platform are converted into physical coordinates associated with the radiation source and the molding platform to obtain the second image. The location information of the radiation source includes the physical coordinates associated with the radiation source and the molding platform.

15. The method according to claim 12, characterized in that, The step of controlling the at least one radiation source to irradiate the constructed material layer according to the second image includes: Based on the temperature of at least one region of the building material layer obtained by the imaging device and the location information of the radiation source in the second image, the power of the radiation source in the corresponding region is controlled so that the radiation source irradiates the building material layer at the specified power.

16. A computer device, characterized in that, include: One or more processors; Memory; And one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs including instructions that, when executed by the computer device, cause the computer device to perform the three-dimensional printing method according to any one of claims 12 to 15.

17. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the computer device on which the non-transitory computer-readable storage medium resides to perform the three-dimensional printing method according to any one of claims 12 to 15.

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