3D printing equipment, printing control method and device

Abstract

The present application provides a 3D printing device, a printing control method, and an apparatus, wherein the 3D printing device can determine the printing mode of a 3D model based on model data. Different temperature control methods are used in different printing modes, so that the 3D printing device prints the 3D model according to the printing mode, thereby enabling more timely, accurate, and effective printing control of the 3D model, improving the temperature uniformity of the model area during the 3D model printing process, and thereby improving the printing quality and printing success rate of the 3D model.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and in particular to a 3D printing device, a printing control method and an apparatus. Background Art

[0002] A 3D printer is a device that can print 3D models. Some 3D printers can print 3D models using polymer powder 3D molding technology. 3D printers provide powder material to form layers of powder material, and then spray liquid material onto the powder material layer to form a slice layer of the 3D model. The 3D model is formed by stacking the slice layers one by one.

[0003] In the prior art, due to the varying cross-sectional shapes and / or sizes of the slice layers of a 3D model, the temperature of the model region varies as the 3D printing device prints each slice layer by layer. To ensure the quality of the resulting 3D model, the 3D printing device is equipped with a temperature sensor and a radiation source, such as an infrared lamp. The temperature sensor detects the temperature of the model region in the slice layer, allowing the 3D printing device to control the radiation source based on the actual temperature requirements, for example by increasing the radiation power of the radiation source.

[0004] However, with the existing technology, there is a long time delay between the temperature sensor detecting the temperature of the model area and the 3D printing device controlling the radiation source to provide radiation to the model area based on the detected temperature so that the temperature rises to the actual required temperature. As a result, the 3D printing device cannot timely and effectively control the temperature of the slice layer model area during the printing process, thereby reducing the printing quality and printing success rate of the 3D model. Summary of the Invention

[0005] The present application provides a 3D printing device, a printing control method and an apparatus to solve the technical problem in the prior art of low printing quality and printing success rate caused by the inability to perform timely and effective printing control when a 3D printing device prints a 3D model.

[0006] A first aspect of the present application provides a printing control method for a 3D printing device, comprising: obtaining model data of a 3D model to be printed; determining a printing mode for the 3D model based on the model data; wherein the printing mode includes one of a first printing mode and a second printing mode, and the 3D printing device uses different temperature control methods in the first printing mode and the second printing mode; and printing at least one slice layer of the 3D model in sequence according to the model data and the printing mode to obtain the 3D model.

[0007] In an embodiment of the first aspect of the present application, the printing mode of the 3D model includes a printing mode of at least one slice layer of the 3D model.

[0008] In an embodiment of the first aspect of the present application, printing at least one slice layer of the 3D model in sequence according to the model data and the printing mode to obtain the 3D model includes: printing each of the at least one slice layer in sequence according to the printing mode of each slice layer in the at least one slice layer and the layer model data of each slice layer in the model data to obtain the 3D model.

[0009] In an embodiment of the first aspect of the present application, determining the printing mode of the 3D model based on the model data includes: receiving the printing mode of the 3D model determined by the user based on the model data through an operation interface.

[0010] In an embodiment of the first aspect of the present application, determining the printing mode of the 3D model based on the model data includes: matching the model data with preset model data stored in a database to obtain the printing mode of the 3D model.

[0011] In an embodiment of the first aspect of the present application, determining the printing mode of the 3D model based on the model data includes: determining at least one slice layer of the 3D model; and determining the printing mode of the at least one slice layer based on the layer model data of the at least one slice layer.

[0012] In an embodiment of the first aspect of the present application, determining the printing mode of the at least one slice layer according to the layer model data of the at least one slice layer includes: matching the layer model data of each of the at least one slice layer in the at least one slice layer with preset layer model data stored in a database to obtain the printing mode of the at least one slice layer; or determining the image contour of the at least one slice layer according to the layer model data of the at least one slice layer; matching the image contour of each of the at least one slice layer in the at least one slice layer with the preset model layer contour stored in the database to obtain the printing mode of the at least one slice layer; or determining the area of ​​the at least one slice layer according to the layer model data of the at least one slice layer; and obtaining the printing mode of the at least one slice layer according to the area of ​​each of the at least one slice layer.

[0013] In an embodiment of the first aspect of the present application, the step of printing at least one slice layer of the 3D model in sequence according to the model data and the printing mode to obtain the 3D model includes: determining layer image data of each slice layer in the at least one slice layer according to the model data and the printing mode; wherein the layer image data includes layer image data of the model area and layer image data of the insulation area, or the layer image data includes layer image data of the model area; determining the printing data of the 3D model according to the layer image data of each slice layer in the at least one slice layer; and printing at least one slice layer of the 3D model in sequence according to the printing data to obtain the 3D model.

[0014] In an embodiment of the first aspect of the present application, before determining the layer image data of each of the at least one slicing layer according to the model data and the printing mode, it also includes: when the printing mode is determined to be the first printing mode, determining the printing mode of at least one previous slicing layer to be the first printing mode.

[0015] In an embodiment of the first aspect of the present application, the previous slice layer includes slice layers within N layers before the current slice layer, where N≥50.

[0016] In an embodiment of the first aspect of the present application, before determining the layer image data of each of the at least one slicing layer according to the model data and the printing mode, it also includes: when the printing mode is the second printing mode, determining the printing mode of a specified number of subsequent slicing layers; when the printing mode of at least one subsequent slicing layer in the specified number of subsequent slicing layers is the first printing mode, determining the printing mode of the current slicing layer to be the first printing mode.

[0017] In an embodiment of the first aspect of the present application, the subsequent slice layer includes slice layers within M layers after the current slice layer, where M≤50.

[0018] In an embodiment of the first aspect of the present application, when the printing mode is determined to be the first printing mode, the layer image data includes layer image data of the model area and layer image data of the insulation area, and the printing data includes layer printing data of the model area and layer printing data of the insulation area; when the printing mode is determined to be the second printing mode, the layer image data includes layer image data of the model area, and the printing data includes layer printing data of the model area.

[0019] In an embodiment of the first aspect of the present application, the 3D model is obtained by printing at least one slicing layer of the 3D model in sequence according to the printing data, including: for each of the at least one slicing layer, forming a powder material layer using powder material, and spraying liquid material on the powder material layer according to the printing data to form the slicing layer, thereby obtaining the 3D model according to the at least one slicing layer formed.

[0020] In an embodiment of the first aspect of the present application, when the printing mode is determined to be the first printing mode, the liquid material is sprayed on the powder material layer according to the printing data to form the slicing layer, including: spraying the first liquid material on the powder material layer according to the layer printing data of the model area of ​​the slicing layer, and spraying the second liquid material according to the layer printing data of the insulation area of ​​the slicing layer to form the slicing layer; wherein the first liquid material and the second liquid material are different liquid materials; or, the first liquid material and the second liquid material are the same liquid material, and the amount of the second liquid material sprayed per unit area is lower than the amount of the first liquid material sprayed.

[0021] In an embodiment of the first aspect of the present application, the second liquid material is a heat storage material.

[0022] In an embodiment of the first aspect of the present application, when the printing mode is determined to be the second printing mode, spraying liquid material on the powder material layer according to the printing data to form the slicing layer includes: spraying a first liquid material on the powder material layer according to the layer printing data of the model area of ​​the slicing layer to form the slicing layer.

[0023] In an embodiment of the first aspect of the present application, before spraying the liquid material on the powder material layer, the method further includes providing radiation to the powder material layer to preheat the powder material layer; and / or, after spraying the liquid material on the powder material layer, the method further includes providing radiation to the powder material layer to form a solidified slicing layer.

[0024] In an embodiment of the first aspect of the present application, there is a gap between the model area and the heat preservation area.

[0025] A second aspect of the present application provides a 3D printing device, including a control device, wherein the control device is used to execute the method as described in any one of the first aspects of the present application.

[0026] A third aspect of the present application provides a printing control device for a 3D printing device, configured to execute any of the methods described in the first aspect of the present application.

[0027] The fourth aspect of the present application provides an electronic device comprising: at least one processor and a memory; the memory stores computer instructions; when the at least one processor executes the computer instructions stored in the memory, the at least one processor executes the method as described in any one of the first aspects of the present application.

[0028] In a fifth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions. When a processor executes the computer instructions, the method described in any one of the first aspects of the present application is implemented.

[0029] The sixth aspect of the present application provides a computer program product, including a computer program, which, when executed, implements the method described in any one of the first aspects of the present application.

[0030] In summary, the 3D printing device, printing control method and apparatus provided by the present application enable the 3D printing device to determine the printing mode of the 3D model in advance according to the model data before printing the 3D model. When the 3D printing device is printing the 3D model, the 3D model can be directly printed according to the model data and the printing mode determined in advance. Since the temperature control methods used in different printing modes are different, printing control according to the printing mode can be more timely, accurate and effective in controlling the printing of the 3D model, and improve the temperature uniformity of the model area during the 3D model printing process. At the same time, since the temperature can be controlled by the printing mode determined by the model data of the 3D model, the frequency of the control device in the 3D printing device performing printing control according to the temperature detected by the temperature sensor is reduced, and the accuracy requirements for the temperature sensor are reduced, thereby saving the production and manufacturing costs of the 3D printing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 A schematic diagram of the structure of a 3D printing device provided in this application;

[0033] Figure 2 This is a flow chart of an embodiment of a printing control method for a 3D printing device provided by the present application;

[0034] Figure 3 A schematic diagram of an operation interface provided by this application;

[0035] Figure 4A schematic diagram of the correspondence between model data and printing modes provided in this application;

[0036] Figure 5 A schematic diagram of the correspondence between layer model data and printing mode provided in this application;

[0037] Figure 6 A schematic diagram of the correspondence between the model layer profile and the printing mode provided in this application;

[0038] Figure 7 A flow chart of another embodiment of the printing control method for a 3D printing device provided by the present application;

[0039] Figure 8 A schematic diagram of a 3D model provided in this application;

[0040] Figure 9 A schematic diagram of a layer of image data for a first printing mode provided by the present application;

[0041] Figure 10 A schematic diagram of another layer of image data for the first printing mode provided by the present application;

[0042] Figure 11 A schematic diagram of another layer of image data for the second printing mode provided by the present application;

[0043] Figure 12 A schematic diagram of the structure of a printing control device for a 3D printing device provided in this application;

[0044] Figure 13 A schematic diagram of the structure of a printing control device for another 3D printing device provided in this application;

[0045] Figure 14 This is a structural schematic diagram of a printing control device of another 3D printing device provided in this application. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the numbers used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0048] The numbers in the flowcharts of this application are not numbered or ordered; they are simply used to distinguish the steps to be described, facilitating a simple and clear description of the technical solution of this application. The technical solution of this application is described in detail below using specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0049] This application provides a 3D printing device and a printing control method for the 3D printing device. The 3D printing device can be a 3D printer. The 3D printing device can be used to print 3D models. The embodiments of this application do not limit the shape and structure of the 3D models that can be printed by the 3D printing device.

[0050] Figure 1 A schematic diagram of the structure of a 3D printing device provided in this application, such as Figure 1 The 3D printing device A0 shown includes: a control device 9, a powder spreading module 4, a molding platform 31 and a spraying module 5.

[0051] The forming platform 31 is used to support the 3D model to be printed.

[0052] The powder spreading module 4 is used to provide powder material to form a powder material layer L0 on the forming platform.

[0053] The inkjet module 5 is used to spray liquid material on the powder material layer L0 to form a slice layer of the 3D model.

[0054] The control device 9 is used to control the powder spreading module 4 to perform a powder spreading operation to form a powder material layer L0, and to control the inkjet module 5 to perform an operation to spray a liquid material. The control device 9 can be used to control the 3D printing device A0 to print a 3D model. For example, the control device 9 can be an electronic device such as a computer, server, or workstation. Alternatively, the control device 9 can be a processing device provided in the 3D printing device A0, such as a CPU, MCU, or SOC processor.

[0055] In one embodiment, the 3D printing device A0 further includes a lifting mechanism 41, which is connected to the molding platform 31. The lifting mechanism can be used to drive the molding platform 31 to move along the Figure 1 When the forming platform 31 is at the designated position, the control device 9 controls the powder spreading module 4 to form a powder material layer L0 on the forming platform 31 and controls the inkjet module 5 to selectively spray liquid material on the powder material layer L0 to form a slice layer of the 3D model at the designated position. Figure 1 The control device 9 moves downward in the vertical direction by a distance of specified layer thickness, and the control device 9 continues to control the powder spreading module 4 and the inkjet module 5 to perform powder spreading and inkjet actions after each movement of the forming platform 31, thereby forming a slice layer of the 3D model at each position, and the slice layers formed at all positions are superimposed layer by layer to form a complete 3D model.

[0056] In one embodiment, the powder spreading module 4 includes: a powder storage chamber 23, a lifting mechanism 22 and a powder spreading device 21. The powder storage chamber 23 is used to store the powder material 0. The powder storage chamber 23 has a movable support plate 231 inside. The lifting mechanism 22 is connected to the support plate 231 and can drive the support plate 231 to move upward. Figure 1 The powder spreader 21 is used to rise or fall in the vertical direction. Figure 1 The powder spreading device 21 moves from the left to the right. Figure 1 When moving from left to right, the powder spreader can be used to spread the powder material 0 stored in the powder storage chamber 23 onto the forming platform 3 to form a powder material layer L0. Commonly used powder spreaders 21 can be powder spreaders or scrapers.

[0057] In one embodiment, the inkjet module 5 includes: a print head 26. Specifically, the print head 26 includes at least two nozzle arrays, each nozzle array is used to spray a liquid material. Figure 1 In the example, the print head 26 includes two nozzle arrays, designated as a first nozzle array 26a and a second nozzle array 26b. The first nozzle array 26a is used to eject a first liquid material A, and the second nozzle array 26b is used to eject a second liquid material B. The control device 9 can be used to control the first nozzle array 26a and the second nozzle array 26b of the print head 26 to selectively eject powder material layer L0 to form a slice layer of the 3D model to be printed.

[0058] In one embodiment, the first liquid material A and the second liquid material B can be stored in different material storage devices. For example, the material storage device can be an ink cartridge. Each material storage device can deliver the first liquid material A and the second liquid material B through different liquid material delivery lines.

[0059] In one embodiment, the first nozzle array 26a and the second nozzle array 26b may be integrated into a multi-channel printhead, or the first nozzle array 26a and the second nozzle array 26b may be two multi-channel printheads. Each multi-channel printhead includes at least two rows of nozzles, such as two rows, three rows, or four rows, or may be two single-channel printheads. The specific implementation of the nozzle array is not limited in the embodiments of the present application.

[0060] In one embodiment, the 3D model printing device further includes an energy radiation module 7 . The energy radiation module 7 includes one or both of a preheating component 51 and a heating component 52 .

[0061] The preheating component 51 is used to provide radiation energy or thermal energy to preheat the powder material layer L0, thereby facilitating the solidification of the first liquid material and the powder material in contact with the first liquid material in the model region to form the slice layer of the 3D model. The preheating component 51 may include at least one of an ultraviolet lamp, an infrared lamp, a microwave emitter, a heating wire, a heating sheet, and a heating plate.

[0062] The heating component 52 is used to heat the powder material layer L0 sprayed with the liquid material after the print head 26 sprays the first liquid material and / or the second liquid material. The heating component 52 may include at least one of an ultraviolet lamp, an infrared lamp, a microwave transmitter, a heating wire, a heating sheet, and a heating plate.

[0063] In one embodiment, the heating component 52 provided in the 3D printing device A0 is related to the type of the first liquid material. For example, when the first liquid material is a liquid material that undergoes a photopolymerization reaction, the heating component 52 may be an ultraviolet lamp, which can be used to provide radiation energy such as ultraviolet radiation, thereby inducing a photopolymerization reaction of the photocurable components in the first liquid material through ultraviolet radiation. When the first liquid material is a liquid material that undergoes a thermal polymerization reaction or a liquid material that absorbs thermal radiation, the heating component 52 may include at least one of an infrared lamp, a microwave, a heating wire, a heating sheet, and a heating plate, which can be used to provide thermal energy, thereby inducing a thermal polymerization reaction of the thermally curable components in the first liquid material through thermal energy, or the components in the first liquid material that absorb thermal radiation absorb thermal radiation and convert it into thermal energy, thereby causing the powder material in contact with the first liquid material to melt and form.

[0064] In one embodiment, the preheating component 51 can be installed above the molding platform 31. For example, the preheating component 51 can be installed on the top of the molding chamber 10 of the 3D printing device A0. When the energy radiation module 7 includes the preheating component 51 and the heating component 52, the preheating component 51 is installed on the top of the molding chamber 10, and the heating component 52, the print head 26 and the heating component 52 are installed on the guide rail 11 in sequence, and can be installed on the guide rail 11. Figure 1Alternatively, the preheating component 51 is installed on the top of the molding chamber 10, and the heating component 52 is located on one side of the print head 26.

[0065] In one embodiment, the 3D printing device A0 further includes a temperature monitor for monitoring the temperature of the powder material layer L0. The temperature monitor can be used to transmit the monitored temperature information to the control device 9, which controls the intensity of the energy provided by the preheating component 51 and / or the heating component 52 based on the temperature information.

[0066] based on Figure 1 The 3D printing device shown in the present application also provides a printing control method for the 3D printing device, which can print the 3D model in different printing modes according to the model data of the 3D model to be printed, so as to solve the technical problem of low printing quality and printing success rate caused by the inability to perform timely and effective printing control when the 3D printing device prints the 3D model in the prior art.

[0067] The following describes the printing control method of the 3D printing device provided by the embodiment of the present application in conjunction with the accompanying drawings. The printing control method provided by the embodiment of the present application can be applied to Figure 1 In the 3D printing device shown, the control device 9 is specifically executed. Alternatively, the printing control method for the 3D printing device provided in the embodiment of the present application can also be applied to other 3D printing devices. The embodiment of the present application uses the control device 9 of the 3D printing device as an example to illustrate the execution subject of the printing control method.

[0068] Figure 2 This is a flow chart of an embodiment of a printing control method for a 3D printing device provided by this application. Figure 2 The print control method shown includes:

[0069] S101: Acquire model data of a 3D model to be printed.

[0070] In one embodiment, the control device may obtain the model data of the 3D model to be printed via a data acquisition module configured to receive model data. Alternatively, the control device may scan a physical model corresponding to the 3D model to be printed using a connected scanner, and then perform three-dimensional reconstruction to obtain the model data of the 3D model. Alternatively, the control device may download the model data of the 3D model from a data platform. Alternatively, the control device may draw the model data of the 3D model to be printed. Other methods are also possible, not listed here.

[0071] In one embodiment, the data format of the model data of the 3D model provided in the embodiment of the present application may include a data format with color attributes and a data format without color attributes. For example, the data format with color attributes may be PLY format, OBJ format, AMF format, 3MF format, VRML format, etc. The data format without color attributes may be STL format, RPI format, etc. The model data in the data format with color attributes includes the structural information of the model and the attribute information of the model. The attribute information of the model is selected from one of the color attribute of the model and the mechanical property attribute of the model. The color attribute of the model, also known as the color information of the model, specifically refers to the surface color of the model, such as red, yellow, green, purple, etc. The mechanical property attribute of the model, also known as the mechanical property information of the model, specifically refers to the surface material of the model, such as soft, hard, etc. The structural information of the model includes the geometric shape of the model.

[0072] S102: Determine a printing mode of the 3D model according to the model data.

[0073] Specifically, the control device determines a printing mode for the 3D printing device to print the 3D model according to the model data of the 3D model acquired in S101.

[0074] The printing mode includes one of a first printing mode and a second printing mode. The temperature control method used by the 3D printing device in the first printing mode is different from the temperature control method used in the second printing mode.

[0075] In one embodiment, the first and second printing modes are executed by the 3D printing device in different print jobs. Different print jobs correspond to different printing processes. Executing the first and second printing modes in different print jobs specifically means executing only one printing mode in a single print job. For example, the 3D printing device executes the first printing mode when printing one 3D model and the second printing mode when printing another 3D model. That is, the 3D printing device executes only one of the first or second printing modes in a single print job.

[0076] In another embodiment, the first printing mode and the second printing mode are executed by the 3D printing device during the printing process of different slice layers of a 3D model in the same printing job. Specifically, for the 3D printing device to print the slice layers of the 3D model layer by layer, the 3D printing device executes a printing mode in the printing process of different slice layers when printing a 3D model. For example, the 3D printing device executes the first printing mode when printing a portion of the slice layers of a 3D model, and executes the second printing mode when printing another portion of the slice layers of the 3D model. At this time, the printing mode of the 3D model determined by the control device in S102 specifically includes the printing mode of each slice layer in at least one slice layer of the 3D model.

[0077] S103: Print at least one slice layer of the 3D model in sequence according to the model data and the printing mode to obtain a 3D model.

[0078] Specifically, the control device prints each slice layer of at least one slice layer of the 3D model in sequence according to the model data determined in S101 and the printing mode determined in S102 to obtain the 3D model.

[0079] In one embodiment, when the first printing mode and the second printing mode are executed by the 3D printing device in different printing operations, the control device, in S103, sequentially prints each slice layer of the at least one slice layer of the 3D model based on the layer model data of each slice layer and one of the first printing mode or the second printing mode to obtain a 3D model. In this case, the printing mode of each slice layer of the 3D model is the same.

[0080] In another embodiment, when the first printing mode and the second printing mode are executed by the 3D printing device during the printing process of different layers in the same print job, the control device sequentially prints each slice layer of the at least one slice layer of the 3D model based on the layer model data of each slice layer and the printing mode corresponding to each slice layer, thereby obtaining a 3D model. In this case, the printing mode of each slice layer of the 3D model can be different. Because the 3D printing device can print each slice layer separately according to the printing mode of each slice layer, the printing process of the 3D printing device has a higher granularity, improves the degree of refinement when the 3D printing device prints the 3D model, and thereby improves the print quality of the 3D model printed by the 3D printing device.

[0081] In summary, the control method of the 3D printing device provided in this embodiment enables the 3D printing device to determine the printing mode of the 3D model in advance according to the model data before printing the 3D model. When the 3D printing device is printing the 3D model, it can directly print the 3D model according to the model data and the printing mode determined in advance. Since the temperature control methods used in different printing modes are different, printing control according to the printing mode can be more timely, accurate and effective in controlling the printing of the 3D model, and improve the temperature uniformity of the model area during the 3D model printing process, thereby improving the printing quality and printing success rate of the 3D model printed by the 3D printing device. At the same time, since the temperature can be controlled by the printing mode determined by the model data of the 3D model, the frequency of the control device in the 3D printing device performing printing control according to the temperature detected by the temperature sensor is reduced, and the accuracy requirements for the temperature sensor are reduced, saving the production and manufacturing costs of the 3D printing device.

[0082] The following describes, with reference to the accompanying drawings, a specific implementation of the step of determining the printing mode of the 3D model according to the model data in S102 of the printing control method for the 3D printing device provided in an embodiment of the present application.

[0083] In one embodiment, when the first printing mode and the second printing mode are executed by the 3D printing device in different printing jobs, the printing mode includes the printing mode of the entire 3D model. The control device can receive the printing mode of the 3D model determined by the user based on the model data of the 3D model through the operation interface. For example, Figure 3 This is a schematic diagram of an operation interface provided by this application. Figure 3 The illustrated operation interface may be provided by the control device of the 3D printing device. For example, the control device 9 of the 3D printing device may be connected to a display device 901, such as a monitor, and display information corresponding to the two printing modes via the operation interface provided by the monitor. Subsequently, the control device of the 3D printing device receives, via the operation interface provided by the monitor, the printing mode determined by the user based on the model data of the 3D model. Therefore, in this embodiment, the control device can determine the printing mode based on the received user instructions, eliminating the need to perform calculations to determine the printing mode, reducing the amount of calculations required by the control device, enhancing the user's control over the 3D printing device, and improving the user experience.

[0084] Alternatively, the control device may match the model data with the preset model data stored in the database, thereby obtaining a printing mode of the 3D model corresponding to the model data. Figure 4 This is a schematic diagram of the corresponding relationship between model data and printing mode provided by this application. Figure 4As shown, the preset model data of N preset models can be stored in advance in the database of the control device, and the shapes, sizes, etc. of the N preset models are all different. In addition, the database can also store the printing mode corresponding to each preset model as one of the first printing mode or the second printing mode. The control device then matches the model data of the 3D model to be printed with the preset model data of the N preset models, determines the preset model data that is identical or substantially identical to the model data of the 3D model to be printed, and then determines the printing mode corresponding to the preset model data of the preset model as the printing mode of the 3D model to be printed. Therefore, in this embodiment, the control device can determine the printing mode based on the model data, has a higher degree of intelligence, and does not require the user to select the printing mode, further improving the intelligence of the 3D printing device, improving the printing efficiency of the 3D printing device, and improving the user experience.

[0085] In another embodiment, when the first printing mode and the second printing mode are executed by the 3D printing device during the printing process of different layers in the same printing job, the control device first slices the 3D model to obtain at least one slice layer. Subsequently, the control device determines the printing mode of each slice layer in the at least one slice layer based on the layer model data of the at least one slice layer. In this embodiment, by determining the printing mode of at least one slice layer of the 3D model layer by layer and performing printing control based on the printing mode corresponding to each slice layer, the granularity of the printing control of the 3D printing device can be improved, and the degree of intelligence and refinement of the control device during control can be improved, thereby further improving the print quality of the 3D model printed by the 3D printing device and effectively preventing abnormalities such as warping and deformation during the printing process of the 3D model.

[0086] For example, the control device may match the layer model data of the slice layer with the preset layer model data stored in the database, thereby obtaining a printing mode corresponding to the layer model data of each slice layer in at least one slice layer. Figure 5 This is a schematic diagram of the corresponding relationship between layer model data and printing mode provided by this application. Figure 5 As shown, the control device's database can pre-store preset layer model data for M preset layer models, each of which has different shapes, sizes, and other characteristics. Furthermore, the database can also store whether the printing mode corresponding to each preset layer model data is a first printing mode or a second printing mode. The control device then sequentially matches the layer model data for each slice layer in the model data with the M preset layer model data, determines the preset layer model data that is identical or substantially identical to the layer model data for each slice layer, and then determines the printing mode for each slice layer.

[0087] Alternatively, the control device may also determine the image contour of each slice layer in at least one slice layer based on the layer model data of each slice layer in at least one slice layer. Specifically, the control device may determine the image contour of the current slice layer based on the layer image data of the slice layer. For example, the boundary between the voxels that perform inkjet printing and the voxels that do not perform inkjet printing in the current slice layer is determined by analyzing the layer image data of the current slice layer, thereby determining the image contour of the current slice layer. Subsequently, the control device matches the image contour of each slice layer with the preset model layer contour stored in the database to obtain the printing mode of at least one slice layer. For example, Figure 6 This is a schematic diagram of the corresponding relationship between the model layer profile and the printing mode provided in this application. Figure 6 As shown, the control device's database can store Q preset model layer contours in advance, each of which has different shapes, sizes, etc. Furthermore, the database can also store whether the printing mode corresponding to each preset model layer contour is a first printing mode or a second printing mode. The control device then sequentially matches the image contour of each slice layer in the model data with the Q preset model layer contours, determines a preset model layer contour that is identical or substantially identical to the image contour of each slice layer, and then determines the printing mode for each slice layer.

[0088] Alternatively, the control device may determine the area of ​​each slice layer in at least one slice layer based on the layer model data of each slice layer in at least one slice layer. Subsequently, the control device obtains the printing mode of at least one slice layer based on the area of ​​each slice layer. Specifically, the number of voxels for inkjet printing in the current slice layer is determined by analyzing the layer model data of the current slice layer, and the area of ​​the model area of ​​the current slice layer is obtained in combination with the printing resolution of the current slice layer. Since the image contour area of ​​the slice layer is large when the 3D printing device prints the slice layer, the model area is prone to warping and deformation during the printing process. For example, when the slice layer area is greater than 200mm 2 , it can be considered that the area of ​​the model region is larger. Therefore, the control device can determine different printing modes according to the area of ​​each slice layer. For example, when the area of ​​the slice layer is greater than or equal to the preset value, the printing mode of the slice layer is determined to be the first printing mode; when the area of ​​the slice layer is less than the preset value, the printing mode of the slice layer is determined to be the second printing mode, and so on. In this embodiment, the printing mode of the slice layer determined by the control device can more accurately control the printing of the printing layer, thereby further improving the printing quality of the 3D model printed by the 3D printing device and effectively preventing abnormalities such as warping and deformation during the printing process of the 3D model.

[0089] The following describes the specific implementation of the step of printing a 3D model according to the model data and the printing mode in S103 of the printing control method of the 3D printing device provided in the embodiment of the present application in conjunction with the accompanying drawings. Figure 7 This is a flow chart of another embodiment of the printing control method for a 3D printing device provided by the present application, wherein the following is shown: Figure 2 A specific implementation of S103 in the embodiment shown.

[0090] Specifically, if Figure 7 As shown in the embodiment of the present application, the steps of controlling the device to print the 3D model according to the model data and the printing mode specifically include:

[0091] S1031: Determine the layer image data of each slice layer according to the model data and the printing mode.

[0092] Specifically, the control device first determines the layer image data of each slice layer in at least one slice layer of the 3D model according to the model data and the printing mode.

[0093] For example, Figure 8 This is a schematic diagram of a 3D model provided by this application. Figure 8 As shown, the 3D model to be printed is a cuboid as an example, and the length, width, and height of the cuboid are denoted as l, d, and h respectively.

[0094] In one embodiment, when the printing mode of the 3D model is determined to be the first printing mode, the control device can slice and layer the 3D model according to the model data of the 3D model in the determined first printing mode, thereby obtaining at least one slice layer Ln and layer image data of each slice layer in the at least one slice layer. For example, L1 represents the first slice layer, L2 represents the second slice layer, and Ln represents the nth slice layer. Figure 8 In the example shown, assuming that the plane of the length l and width d of the lower portion of the cuboid 3D model is placed on the printing platform, the control device can slice and layer the 3D model in the direction of the height h of the cuboid 3D model, obtaining multiple slice layers stacked and arranged in sequence in the direction of height h. In this embodiment, the layer image data of at least one slice layer Ln includes layer image data of the model area and layer image data of the insulation area.

[0095] In another embodiment, when the printing mode of a slice layer in at least one slice layer of a 3D model is determined to be the first printing mode, the control device can perform data processing on the layer image data of the slice layer in the first printing mode to obtain new layer image data, for example, merging the layer image of the slice layer with the layer image corresponding to the first printing mode to obtain a new layer image, wherein the new layer image data includes layer image data of the model area and layer image data of the insulation area.

[0096] For example, Figure 9 This is a schematic diagram of a layer of image data in the first printing mode provided by this application, such as Figure 9 China-Israel Figure 8 Taking the slice layer Ln as an example, the layer image data includes the layer image data of the model area W1n and the layer image data of the insulation area Fn. The insulation area is the area outside the model area that is not the model area. After the 3D model is printed, the insulation area needs to be separated from the model area where the 3D model is located.

[0097] In one embodiment, Figure 10 This is a schematic diagram of another layer of image data in the first printing mode provided by this application, such as Figure 10 A gap S is shown between the model area W1n and the insulation area Fn. The 3D printing device does not perform inkjet processing within gap S. The width of gap S can range from the diameter of a single ink droplet to 5 mm. By reserving gap S between the model area W1n and the insulation area Fn, this embodiment prevents powder material in the insulation area from melting and adhering to the surface of the model area, further improving the surface quality of the printed 3D model.

[0098] In another embodiment, when the printing mode of the 3D model is determined to be the second printing mode, the control device can slice and layer the 3D model according to the model data of the 3D model in the determined second printing mode to obtain at least one slice layer and layer image data of each slice layer in the at least one slice layer, and the layer image data includes layer image data of the model area.

[0099] In yet another embodiment, when the printing mode of a slice layer in at least one slice layer of the 3D model is determined to be the second printing mode, the layer image data of the slice layer includes layer image data of the model region.

[0100] For example, Figure 11 This is a schematic diagram of another layer of image data in the second printing mode provided by this application, such as Figure 11 China-Israel Figure 8 Taking the slice layer Ln as an example, the layer image data includes the layer image data of the model area W1n.

[0101] It is understandable that if Figure 9 and Figure 11In the example shown, for a slice layer, the layer image data when the slice layer is in the first printing mode and the layer image data when the slice layer is in the second printing mode are respectively shown. Therefore, when the first printing mode and the second printing mode are executed by the 3D printing device in the printing process of different layers in the same print job, the control device can obtain the layer image data of each slice layer of the 3D model based on the layer image data of each slice layer and the determined first printing mode and second printing mode of each slice layer. Alternatively, when the first printing mode and the second printing mode are executed by the 3D printing device in different print jobs, the control device can slice and layer the 3D model based on the model data of the 3D model and the determined first printing mode or second printing mode of the model, thereby obtaining the layer image data of each slice layer of the 3D model.

[0102] Therefore, in the control method for a 3D printing device provided in this embodiment, the layer printing data in the first printing mode is determined to include layer printing data for the model area and layer printing data for the insulation area. Thus, by insulating the model area with the insulation area, the temperature of the model area can be prevented from diffusing to non-model areas, thereby achieving temperature control in the model area and improving the print quality of the model area. Furthermore, the layer printing data in the second printing mode is determined to include layer printing data for the model area. This allows for a more refined and effective reduction in the number of insulation area settings while ensuring print quality, reducing the material required to print the 3D model, saving the cost of the 3D printing device, and improving the economic efficiency of the 3D printing device.

[0103] In summary, the control method of the 3D printing device provided in this embodiment can realize the printing of different 3D models using different printing modes, or the printing of different slice layers of the same 3D model using different printing modes. Compared with the printing control method in which all 3D models and all slice layers of a 3D model use the same printing mode, the control method in this embodiment is more flexible and can save the materials required for printing 3D models.

[0104] S1032: Determine printing data of the 3D model according to the layer image data of each slice layer.

[0105] Specifically, the control device determines the printing data of the 3D model according to the layer image data of each slice layer in the at least one slice layer determined in S1031.

[0106] In one embodiment, when the printing mode is determined to be the first printing mode, the layer image data includes the layer image data of the model area and the layer image data of the insulation area, and the printing data includes the layer printing data of the model area and the layer printing data of the insulation area. Figure 9The control device can determine that the printing data includes the layer printing data of the model area W1n and the layer printing data of the heat preservation area Fn based on the layer image data of the slice layer Ln. When the printing mode is determined to be the second printing mode, the layer image data includes the layer image data of the model area, and the printing data includes the layer printing data of the model area. Figure 11 The control device can determine that the printing data includes the layer printing data of the model area W1n based on the layer image data of the slice layer Ln.

[0107] It can be understood that the printing data determined by the control device in S1032 includes the layer printing data of each slice layer of the 3D model, wherein the slice layer printing data in the first printing mode includes the layer printing data of the model area W1n and the layer printing data of the insulation area Fn, and the slice layer printing data in the second printing mode only includes the layer printing data of the model area W1n and does not include the layer printing data of the insulation area Fn.

[0108] In a further optional embodiment, when the printing mode of a slice layer is determined to be the first printing mode, the control device further determines that the printing mode of the previous slice layer is the first printing mode based on the model data of the previous slice layer and the first printing mode determined for the current slice layer, and determines that the layer image data of the previous slice layer includes the layer image data of the model area and the layer image data of the insulation area, and determines that the printing data of the previous slice layer includes the layer printing data of the model area and the layer printing data of the insulation area. In one embodiment, the previous slice layer refers to a slice layer that is closer to the forming platform than the current slice layer when the 3D model is printed, and is a slice layer within N layers before the current slice layer, where N ≥ 50. Therefore, in this embodiment, after determining that the printing mode of the current slice layer is the first printing mode, the control device can also determine the printing mode of the slice layer within N previous layers as the first printing mode, thereby further preventing the heat of the model area from diffusing toward the forming platform during the printing of the current slice layer, thereby more effectively maintaining the temperature consistency of the model area during the printing of the current slice layer.

[0109] In another further optional embodiment, when the printing mode of a slice layer is determined to be the second printing mode, the control device also determines the printing modes of a specified number of subsequent slice layers. Furthermore, when the printing mode of at least one of the specified number of subsequent slice layers is the first printing mode, the printing mode of the current slice layer is determined to be the first printing mode. Furthermore, the layer image data packet of the current slice layer includes layer image data of the model area and layer image data of the insulation area, and the printing data includes layer printing data of the model area and layer printing data of the insulation area. In one embodiment, the subsequent slice layers include slice layers that are farther away from the build platform than the current slice layer when the 3D model is printed, and slice layers within M layers after the current slice layer, where M ≤ 50. Therefore, in this embodiment, after determining that the printing mode of the current slice layer is the second printing mode, the control device can adjust the printing mode of the current slice layer according to the printing modes of the specified number of subsequent slice layers, thereby preventing heat from the model area from diffusing toward the current slice layer during the subsequent slice printing process, thereby more effectively maintaining temperature consistency in the model area during the subsequent slice layer printing process.

[0110] S1033: Print at least one slice layer in sequence according to the printing data to obtain a 3D model.

[0111] Specifically, the control device prints at least one slice layer of the 3D model in sequence according to the printing data determined in S1032, and all of the at least one slice layer are stacked in sequence to obtain the 3D model.

[0112] In one embodiment, controlling the device to print a slice layer of the 3D model specifically includes: forming a powder material layer using powder material, and spraying liquid material on the powder material layer according to printing data to form the slice layer.

[0113] Combine Figure 1 ,like Figure 1 In the illustrated 3D model printing apparatus, the control device 9 controls the powder spreading module 4 to form a powder material layer L0 using powder material, and controls the inkjet module 5 to spray liquid material onto the powder material layer L0 to form a slice layer of the 3D model. The control device 9 sequentially controls the lifting mechanism 41, the powder spreading module 4, and the inkjet module 5 to form at least one slice layer, and each slice layer is stacked sequentially to form a 3D model.

[0114] Specifically, the powder material is a material particle in powder form, including an organic polymer powder material. The specific type of organic polymer powder material is not limited, and can be at least one of polystyrene (PS), polyvinyl chloride (PVC), polyacrylonitrile (PAN), acrylonitrile-styrene-acrylate copolymer (ASA), polyamide (PA), polyester, polyurethane (PU), modified polyamide, poly(meth)acrylate, polyvinyl fluoride, chlorinated polyolefin, polyvinyl alcohol (PVA) containing hydroxyl groups, cellulose, modified cellulose, polycarbonate, cellulose ester, cellulose ether, cellulose acetate, polymethyl methacrylate, polyvinyl fluoride, etc.

[0115] In one embodiment, the powder material may further include additives, including at least one of a flow aid and a filler. The flow aid is used to improve the fluidity of the powder material and may be, for example, silicon dioxide or talc. The filler is used to enhance the mechanical strength of the three-dimensional object and may be, for example, graphene, carbon nanotubes, carbon fibers, glass microspheres, glass fibers, kaolin, etc., and is not limited in this embodiment.

[0116] In one embodiment, the melting point or melting temperature of the organic polymer powder material can be 60°C-300°C, specifically 60°C, 70°C, 80°C, 100°C, 120°C, 150°C, 180°C, 200°C, 240°C, 280°C or 300°C, etc. Of course, it can also be other values ​​within the above range, which is not limited here.

[0117] In one embodiment, there is no particular limitation on the particle shape and particle size of the powder material. Optionally, the powder material may be in the shape of a sphere, a dendritic shape, a flake shape, a disc shape, a needle shape, or a rod shape. The average particle size of the powder material is 1 μm to 400 μm, for example, 1 μm, 5 μm, 10 μm, 30 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, or 400 μm, and the average particle size of the powder material is preferably 30 μm to 200 μm. The particle gap in the powder material is approximately 5 nm to 100 μm, for example, 5 nm, 10 nm, 100 nm, 250 nm, 500 nm, 1 μm, 5 μm, 10 μm, 25 μm, 50 μm, 75 μm, or 100 μm, which is not limited here. The particle gaps of the powder material in each embodiment of the present application are in the range of 5 nm to 100 μm, which is conducive to the rapid penetration of liquid material into the interior of the powder material layer through the gaps and retention of part of the liquid material on the surface.

[0118] In one embodiment, when the control device is printing a 3D model, for a slice layer determined to be in the first printing mode, the layer printing data for the slice layer includes layer printing data for the model region and layer printing data for the insulation region. When printing the slice layer in the first printing mode, the control device sprays a first liquid material on the powder material layer based on the layer printing data for the model region of the slice layer, and sprays a second liquid material based on the layer printing data for the insulation region of the slice layer. Ultimately, the sprayed first and second liquid materials combine to form a single slice layer from the powder material layer.

[0119] Specifically, the first liquid material can be a light-curable material. When the first liquid material is sprayed onto the powder material layer, the first liquid material can trigger a curing reaction under light radiation, thereby wrapping the powder material in contact with it and curing it to form a model area within a slice layer of the 3D model.

[0120] The photocurable material described in the embodiments of this application refers to a material that undergoes a curing reaction when exposed to a radiation source. Specifically, the radiation source may be UV light, electromagnetic radiation, infrared light, etc. The photocurable material used in this embodiment may specifically include a photocurable resin and / or monomer, a photoinitiator, and may also include an auxiliary agent.

[0121] In this embodiment, there is no particular limitation on the photocurable resin, as long as it can undergo a photocuring reaction. Preferably, it is at least one of (meth)acrylate oligomers with a nitrogen-containing heterocyclic ring, such as BMA-200 and XMA-222LF produced by Bomar; and / or, at least one of (meth)acrylate oligomers with an aliphatic ring, such as aliphatic polyurethane acrylate, aliphatic epoxy acrylate, etc.; and / or, at least one of (meth)acrylate oligomers with an aromatic ring, such as dimethicone. Phenol A (meth)epoxy acrylate, aromatic polyurethane (meth)acrylate, aromatic polyester (meth)acrylate, etc.; and / or, at least one selected from (meth)acrylate oligomers having an oxygen (sulfur) heterocyclic structure, such as oxadiene diacrylate, trimethylolpropane formal acrylate, etc.; and / or, at least one selected from epoxy resins that undergo a ring-opening reaction, such as polyglycidyl ester, poly-(β-methylglycidyl) ester, polyglycidyl ether, poly-(β-methylglycidyl) ether, etc.; and / or, at least one selected from (meth)acrylate oligomers without a cyclic structure, such as at least one selected from polyether acrylate, polyester acrylate, hyperbranched acrylate oligomer, etc.

[0122] The present embodiment has no particular restrictions on the monomers, as long as they can participate in the photocuring reaction and play a role in adjusting the parameter properties of the photocurable material. Specifically, it can be selected from at least one of the amide monomers with nitrogen-containing heterocyclic rings, such as acryloylmorpholine (ACMO), N-vinyl pyrrolidone, N-vinyl caprolactam, etc.; and / or, at least one of the (meth)acrylate monomers with aliphatic rings, such as dicyclopentadiene methacrylate (dicyclopentadiene methacrylate), dicyclopentane (meth)acrylate, isobornyl (meth)acrylate, 1-adamantane (meth)acrylate, cyclohexanedimethanol diacrylate, tricyclodecane dimethanol di(meth)acrylate, etc.; and / or, at least one of the (meth)acrylate monomers with aromatic rings, such as ethoxylated bisphenol A di(meth)acrylate, propoxylated bisphenol A di(meth)acrylate, Benzyl methacrylate (benzyl methacrylate), 2-phenoxyethyl methacrylate, etc.; and / or, at least one selected from (meth)acrylate monomers with an oxygen (sulfur) heterocyclic structure; and / or, at least one selected from (meth)acrylate monomers with a nitrogen-containing heterocyclic structure, such as M370 produced by Goody Company, EM2308 produced by Changxing Company, PAR-68A produced by Shenzhen Sabis Company, A9300-1CL produced by Xinzhongcun Company, etc.; and / or, selected from (meth)acrylate monomers without a cyclic structure, such as at least one selected from 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate, diethylene glycol diacrylate, dipropylene glycol diacrylate, etc.

[0123] The photoinitiator used in this embodiment can be at least one of a free radical photoinitiator and a cationic photoinitiator. Specifically, the free radical photoinitiator can be selected from at least one of α-hydroxyketones, α-aminoketones, acylphosphine oxides, oxime esters, ITX (isopropylthioxanthone), tertiary amine benzoates, and active amine free radical photoinitiators; the cationic photoinitiator can be selected from onium salts with weakly nucleophilic anions, such as halonium salts, sulfonium salts, sulfonium oxide salts, iodine salts, and diazonium compounds.

[0124] The auxiliary agent used in this embodiment can be selected from at least one of a surfactant, a defoaming agent and an inhibitor, and can also include other types of auxiliary agents.

[0125] In this embodiment, there is no special restriction on the above-mentioned surfactant, as long as it can reduce the surface tension of the photocurable material and improve the leveling property of the material. For example, the surfactant commonly used on the market can be selected, such as BYK's modified polysiloxane polymer surfactants BYK-333, BYK-337, BYK-371, BYK-377, BYK1798, BYK-UV3530, BYK-UV3575, etc., and Tego's modified polysiloxane polymer surfactants Tegowet270, TEGO wet 500, Tego Glide 450, TEGO RAD 2010, TEGO RAD 2011, etc.

[0126] Defoamers are primarily used to suppress or eliminate bubbles generated during the preparation and printing of photocurable materials, preventing them from affecting the smoothness of the photocurable materials during printing. This embodiment does not specifically limit the defoamer. Examples include BYK's silicone polymer defoamers BYK-088 and BYK-020, modified polysiloxane copolymer BYK-1798, silicone-free defoamers BYK-055, and Digo's non-silicone defoamers TEGO Airex 920 and TEGO Airex 921.

[0127] The polymerization inhibitor is mainly used to prevent the free radicals in the photocurable material from undergoing polymerization reaction, improve the storage stability of the photocurable material, and prevent the photocurable material from producing chemical reactions and coagulation. The specific selection of the polymerization inhibitor in this embodiment is not particularly limited, as long as it can improve the storage stability of the photocurable material and has no effect on the photocuring reaction during 3D printing. Commonly used polymerization inhibitors can be, for example, GENORAD 16, GENORAD 18, GENORAD 20, GENORAD 22 of Rahn AG, Tinuvin 234, Tinuvin 770, Irganox 245, Cyanotec S100, Cyanotec 130 of BASF, and Irgastab UV 10, Irgastab UV 22 of Ciba.

[0128] Depending on the color requirements of the target three-dimensional object, the photocurable material in this embodiment may also include a colorant. The colorant can be at least one of a dye and a pigment, preferably a pigment, particularly a self-dispersing nanoscale pigment paste. Because the surface of the self-dispersing nanoscale pigment paste is chemically modified, it prevents pigment flocculation and sedimentation, thereby ensuring the stability of the photocurable material.

[0129] In the specific implementation process of this embodiment, the self-dispersing nano-scale pigment paste used can be a self-dispersing nano-scale inorganic pigment paste or a self-dispersing nano-scale organic pigment paste. Among them, the self-dispersing nano-scale inorganic pigment paste can be a white pigment paste, such as titanium dioxide, zinc oxide, lithopone, lead white, etc.; it can also be a black pigment paste, such as carbon black, graphite, black iron oxide, aniline black, carbon black, etc. The self-dispersing nano-scale organic pigment paste can be a color pigment paste, such as Golden Red (PR21), Lithol Red (PR49:1), Pigment Red G (PR37), Pigment Red 171 (PR171), Light Fast Yellow G (PY1), Hansa Yellow R (PY10), Permanent Yellow GR (PY13), Pigment Yellow 129 (PY129), Pigment Yellow 150 (PY150), Pigment Yellow 185 (PY185), Phthalocyanine Blue (PB15), Indanthrone (PB60), etc.

[0130] In another embodiment, the first liquid material can also be a thermal polymer material, and the first liquid material can also dissolve at least part of the powder material. The first liquid material is selectively sprayed on the powder material layer to form a model area of ​​the 3D model to be printed. The first liquid material dissolves at least part of the powder material under the irradiation of radiation energy and the first liquid material undergoes a polymerization reaction to solidify and form a layer of the 3D model to be printed.

[0131] Illustratively, the first liquid material includes a first active component, a second active component, a first auxiliary agent, and a second auxiliary agent.

[0132] The first active component can be selected from at least one of a monomer containing a carbon-carbon double bond, a composition containing an epoxy group and promoting ring-opening polymerization of the epoxy group, a cyclic lactone, a sulfur heterocyclic compound, a carbonate compound, and a cyclic amide compound. Specifically, the monomer containing a carbon-carbon double bond can be (meth)acrylates, vinyl ethers, allyl ethers, styrene, acryloylmorpholine, N-vinyl pyrrolidone, etc. The composition containing an epoxy group and promoting ring-opening polymerization of the epoxy group can be a small molecule or prepolymer containing an epoxy diluent and / or a hydroxyl group, or a small molecule or prepolymer containing an epoxy diluent and / or a carboxyl group. The cyclic lactone can be γ-butyrolactone, δ-valerolactone, ε-caprolactone, etc.; the sulfur heterocyclic compound can be thiirane, thietane, etc.; the carbonate compound can be dimethyl carbonate, diethyl carbonate, etc.; the cyclic amide compound can be caprolactam, etc.

[0133] For example, the first active component may be styrene or γ-butyrolactone, and the powder material may be polystyrene that can be dissolved by styrene or γ-butyrolactone.

[0134] The first active component can also be a (meth)acrylate monomer, and the powder material can be poly(meth)acrylate, cellulose, modified cellulose, polyvinyl alcohol containing hydroxyl groups, polyester, polyurethane, modified polyamide, etc. dissolved by the (meth)acrylate monomer.

[0135] The first active component may also be acryloylmorpholine, and the powder material may be polyurethane, cellulose, modified cellulose, polyvinyl alcohol containing hydroxyl groups, etc., which can be partially dissolved by acryloylmorpholine.

[0136] The first active component may also be epichlorohydrin or epoxy diluent, and the powder material may also be polycarbonate, modified polyamide, cellulose ester, cellulose ether, etc. that can be dissolved by epichlorohydrin or epoxy diluent.

[0137] The first active component may be γ-butyrolactone, and the powder material may also be polyacrylonitrile, cellulose acetate, polymethyl methacrylate, polyvinyl fluoride, polystyrene, etc., which can be dissolved by γ-butyrolactone.

[0138] The first active component may also be ε-caprolactone, and the powder material may also be chlorinated polyolefin, polyurethane, etc. that can be dissolved by ε-caprolactone.

[0139] The second active component is selected from at least one of monomers and / or prepolymers containing carbon-carbon double bonds, diluents and / or prepolymers containing epoxy groups, monomers and / or prepolymers that promote ring-opening polymerization of epoxy groups, polyols, cyclic lactones, sulfur heterocyclic compounds, and cyclic amide compounds.

[0140] For example, the prepolymer containing carbon-carbon double bonds can be, for example, epoxy or (modified) acrylate prepolymers, polyester acrylate prepolymers, polyurethane acrylate prepolymers, pure acrylate prepolymers, etc. The prepolymer containing epoxy groups can be, for example, E-51, E-41, etc.; the polyol prepolymer can be, for example, polyester diol, polyether diol, polycaprolactone diol, polycarbonate diol, etc. Cyclic lactones can be, for example, lactide, glycolide, etc. Cyclic lactones themselves are solid and have poor solubility. Some compounds with cyclic acetal structures, such as trioxymethylene, are solid themselves. (Meth)acrylate monomers have different solubility for polymers due to their structural differences. For example, isobornyl acrylate, isobornyl methacrylate, lauryl acrylate, lauryl methacrylate, cyclotrimethylolpropane methyl acrylate, etc. have poor solubility for polyurethane powders and are basically insoluble.

[0141] The first auxiliary agent is used to initiate or catalyze the polymerization reaction of the active component, and the first auxiliary agent includes at least one of a free radical initiator, an anion initiator, a cationic initiator and a catalyst.

[0142] The free radical initiator and the cationic initiator are selected from at least one of the above-mentioned free radical initiators and cationic initiators.

[0143] The anionic initiator may be butyl lithium, butyl oxide lithium, or the like.

[0144] The catalyst can be ethylene glycol, stannous isooctanoate, stannous octoate, dibutyltin dilaurate, methylfluorosulfonic acid, ethylfluorosulfonic acid, methylnitrobenzenesulfonic acid, methyl methanesulfonate or tetraphenylporphyrin aluminum compound, etc.

[0145] The second auxiliary agent is selected from at least one of a defoaming agent, a surfactant, an inhibitor, an antioxidant, a plasticizer, and a dispersant.

[0146] The defoaming agent, surfactant and polymerization inhibitor are selected from at least one of the above defoaming agents, surfactants and polymerization inhibitors.

[0147] The main function of the antioxidant is to delay or inhibit the oxidation of the polymer, and examples include 2,6-di-tert-butyl-4-methylphenol, β-tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 4-[(4,6-dioctylthio-1,3,5-triazin-2-yl)amino]-2,6-di-tert-butylphenol, dilauryl thiodipropionate, tris(nonylphenyl)phosphite, triphenyl phosphite, 2-mercaptobenzimidazole, and the like.

[0148] The main function of the plasticizer is to improve the toughness of the finished three-dimensional object, and examples include dioctyl phthalate, butyl benzyl phthalate, diisononyl phthalate, diisodecyl phthalate, diethyl adipate, dibutyl adipate, diisobutyl adipate, di(2-butoxyethyl) adipate, di(2-ethylhexyl) adipate, triethyl citrate, acetyl triethyl citrate, tributyl citrate, and acetyl tributyl citrate.

[0149] The main function of a dispersant is to enhance and improve the dispersion stability of the colorant. For example, the specific dispersant selected is not limited, and examples thereof include BYK102, BYK108, BYK110, BYK180, BYK9133, BYK9076, BYK9131, and Dispers655, Dispers675, Dispers688, Dispers750, and Dispers670 from Digo.

[0150] The following Table 1 exemplifies the specific composition of the first liquid material.

[0151] Table 1

[0152]

[0153] In this embodiment, the first liquid material can also be a liquid material containing a radiation absorber, such as a liquid material containing carbon black particles. The first liquid material is selectively sprayed on the powder material layer to form a model area of ​​the 3D model to be printed. Under thermal radiation, the carbon black particles in the first liquid material absorb radiation energy and convert it into thermal energy, thereby melting and forming the powder material in contact with the first liquid material to form a layer of the 3D model to be printed.

[0154] In this embodiment, the first liquid material can also be other types of liquid materials, as long as the first liquid material is selectively applied to the model area of ​​the powder material layer, and the powder material in the model area can be formed into a layer of the 3D model to be printed under the action of the first liquid material. They are not listed here one by one.

[0155] In one embodiment, the first liquid material and the second liquid material are different liquid materials.

[0156] In one embodiment, the second liquid material is a heat storage material. The heat storage material can more effectively form a heat preservation area, thereby achieving more efficient heat preservation of the model area. When the second liquid material is sprayed onto the powder material layer, the second liquid material can absorb most of the radiation under light radiation and convert it into heat energy, so that the powder material in contact with the second liquid material forms a heat preservation area within a slice layer of the 3D model. The temperature of the heat preservation area is slightly lower than the temperature of the model area, such as the temperature of the heat preservation area is 1-15 degrees lower than the temperature of the model area, thereby slowing down or preventing the heat from the model area from diffusing to the non-model area, which is beneficial to adjusting the temperature consistency of the model area and improving the printing quality of the model.

[0157] Exemplarily, the second liquid material may contain an inorganic salt having a relatively high heat capacity but a relatively low thermal emissivity. When the second liquid material is selectively applied to the heat-insulating region of the powder material layer, the second liquid material can absorb the radiation applied thereto and retain most of the heat energy therein, with very little heat energy being transferred from the second liquid material to the powder material in contact with the second liquid material. Specifically, the inorganic salt is water-soluble and may be at least one of sodium iodide, potassium iodide, sodium chloride, potassium bromide, sodium bromide, sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate, potassium chloride, potassium sulfate, sodium sulfate, potassium phosphate, sodium phosphate, magnesium phosphate, magnesium iodide, magnesium chloride, magnesium bromide, and the like.

[0158] refer to Figure 9When printing the 3D model, the control device sprays the first liquid material at a position corresponding to the model area W1n on the powder material layer according to the layer printing data of the model area W1n to form the model area W1n, and also sprays the second liquid material at a position corresponding to the insulation area Fn on the powder material layer to form the insulation area Fn according to the layer printing data of the insulation area Fn.

[0159] refer to Figure 10 When there is a gap S between the model area W1n and the insulation area Fn, the control device does not spray liquid material in the gap S when printing the 3D model, thereby preventing adhesion between the model area W1n and the insulation area Fn, further improving the surface quality of the printed 3D model.

[0160] Alternatively, in another embodiment, the first liquid material and the second liquid material may be the same liquid material, and the amount of the second liquid material sprayed per unit area is lower than the amount of the first liquid material sprayed per unit area. Figure 9 When printing the 3D model, the control device sprays the first liquid material at the position corresponding to the model area W1n on the powder material layer, and also sprays the first liquid material at the position corresponding to the heat preservation area Fn on the powder material layer, and the amount of the first liquid material sprayed in the heat preservation area Fn per unit area is lower than the amount of the first liquid material sprayed in the model area W1n to form the layer of the 3D model.

[0161] In one embodiment, when the control device is printing a 3D model, for a slice layer determined to be in the second printing mode, the layer printing data for the slice layer includes layer printing data for the model region. When printing the slice layer in the second printing mode, the control device sprays a first liquid material onto the powder material layer based on the layer printing data for the model region of the slice layer, and the sprayed first liquid material causes the powder material layer to form a slice layer.

[0162] refer to Figure 11 When printing the 3D model, the control device sprays the first liquid material at a position corresponding to the model area W1n on the powder material layer according to the layer printing data of the model area W1n to form the model area W1n.

[0163] In one embodiment, the control device further provides radiation preheating to the powder material layer before spraying the liquid material on the powder material layer.

[0164] In one embodiment, after the control device sprays the liquid material on the powder material layer, it further provides radiation to the powder material layer to form a solidified slice layer.

[0165] refer to Figure 1Before and / or after spraying the liquid material on the powder material layer, the control device 9 can control the energy radiation module 7 to provide radiation to the powder material layer to promote the polymerization reaction of the first liquid material in the model area and / or promote the interaction between the first liquid material and the powder material in contact with the first liquid material, thereby promoting the molding of the model area.

[0166] In the aforementioned embodiments, the printing control method and steps of the 3D printing device provided in the embodiments of the present application are described. To implement the method provided in the embodiments of the present application, the execution control device may include hardware structures and / or software modules, and implement the aforementioned functions in the form of hardware structures, software modules, or hardware structures and software modules. Whether a particular function is implemented in the form of hardware structures, software modules, or hardware structures and software modules depends on the specific application and design constraints of the technical solution.

[0167] For example, in one embodiment, Figure 12 A schematic diagram of the structure of a printing control device for a 3D printing device provided in this application is shown as follows: Figure 12 The 3D printing device A0 shown in the figure includes: a control device 9, an inkjet module 5, a powder spreading module 4 and an energy radiation module 7. The specific configuration can be referred to as follows: Figure 1 The embodiments shown are not described in detail here.

[0168] Specifically, if Figure 12 The control device 9 shown specifically includes a data acquisition module 91, a slicing module 92, a data processing module 94, and a printing mode determination module 93. The data acquisition module 91 is used to acquire model data of the 3D model to be printed; the printing mode determination module 93 is used to determine whether the printing mode of the 3D model is the first printing mode or the second printing mode, wherein the temperature control method of the model area is different in the first printing mode and the second printing mode. The data processing module 94 is used to determine the layer printing data of the 3D model based on the model data and the determined printing mode. The powder spreading module 4 is used to form a powder material layer using powder material; the inkjet module 5 selectively sprays liquid material on the powder material layer according to the layer printing data to form a layer of the 3D model. In one embodiment, the printing mode determination module 93 communicates with the data acquisition module 91, and the printing mode determination module 93 matches the received model data with the model data in the database to determine whether the printing mode of the 3D model to be printed is the first printing mode or the second printing mode.

[0169] Figure 13 A schematic diagram of the structure of a printing control device of another 3D printing device provided in this application, such as Figure 13 The 3D printing device A0 shown is different from Figure 12In the control device 9 shown in the figure, in the control device 9 provided in this example, the printing mode determination module 93 receives the printing mode of the model to be printed, such as the first printing mode or the second printing mode, determined by the user based on the model data, through the operation interface. Taking the printing of the 3D model W1 to be printed as an example, the user determines that the printing mode of the model is the first printing mode based on the model data of the 3D model W1 to be printed. The user specifies the printing mode of the model W1 to be printed as the first printing mode through the operation interface. The printing mode determination module 93 receives the instruction that the printing mode of the model W1 to be printed is the first printing mode. The slicing module 92 slices and layers the model to be printed based on the determined first printing mode and the model data of the model W1 to be printed to obtain multiple slice layers. In this embodiment, the user determines the printing mode of the model to be printed based on the model data of the model to be printed, which reduces the amount of data calculation of the printing system and improves the autonomy of the user.

[0170] Figure 14 A schematic diagram of the structure of a printing control device of another 3D printing device provided in this application is shown as follows: Figure 14 The 3D printing device A0 shown is different from Figure 12 The control device 9 shown, in the control device 9 provided in this example, the slicing module 92 slices and layers the model to be printed according to the model data of the model to be printed acquired by the data acquisition module 91 to obtain multiple slice layers, each slice layer includes layer image data of the model area, and the printing mode determination module 93 parses the slice layer to determine the printing mode of the slice layer. The specific method for the printing mode determination module 93 to determine the printing mode of the slice layer has been introduced above and will not be repeated here. Taking the printing of the 3D model W1 to be printed as an example, the slice layer Ln is determined to be printed using the first printing mode. Under the determined first printing mode, the data processing module 94 processes the layer image data of the model area to obtain the layer printing data of the slice layer Ln. The layer image data includes the layer image data of the insulation area and the layer image data of the model area, and the layer printing data includes the layer printing data of the model area and the layer printing data of the insulation area. Taking the printing of the 3D model W1 to be printed as an example, the slice layer Ln is determined to be printed using the second printing mode. Under the determined second printing mode, the data processing module 94 processes the layer image data of the slice layer Ln to obtain the layer printing data of the slice layer Ln. The layer image data includes the layer image data of the model area, and the layer printing data includes the layer printing data of the model area.

[0171] The implementation method and principle of the printing control device for a 3D printing device provided in the embodiment of the present application can be referred to the description of the printing control method for the 3D printing device mentioned above, and will not be repeated here.

[0172] It should be noted that it should be understood that the division of the various modules of the above device is merely a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. Moreover, these modules can all be implemented in the form of software called by a processing element; they can also all be implemented in the form of hardware; some modules can also be implemented in the form of software called by a processing element, and some modules can be implemented in the form of hardware. It can be a separate processing element, or it can be integrated into a chip of the above device. In addition, it can also be stored in the memory of the above device in the form of program code, and called by a processing element of the above device to perform the functions of the above-mentioned determined module. The implementation of other modules is similar. In addition, these modules can all or partly be integrated together, or they can be implemented independently. The processing element described here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above modules can be completed by the hardware integrated logic circuit in the processor element or by instructions in the form of software.

[0173] For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs). For another example, when a module is implemented by a processing element calling a program code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call a program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0174] In the above embodiments, the steps performed by the printing control device of the 3D printing device can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiments of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0175] The present application also provides an electronic device comprising a processor and a memory. The processor and the memory are communicatively connected. The memory stores a computer program. When the processor executes the computer program, the processor may perform the steps of the printing control method for a 3D printing device as described in any of the aforementioned embodiments of the present application.

[0176] The present application also provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed, they can be used to perform the steps of the printing control method for a 3D printing device in any of the aforementioned embodiments of the present application.

[0177] An embodiment of the present application further provides a chip for executing instructions, wherein the chip is used to execute the steps of the printing control method of any 3D printing device as described above in the present application.

[0178] An embodiment of the present application further provides a computer program product, which includes a computer program stored in a storage medium. At least one processor can read the computer program from the storage medium, and when the at least one processor executes the computer program, the steps of the printing control method of any 3D printing device described above in the present application can be implemented.

[0179] In one embodiment, the printing control device of the 3D printing device provided in the embodiment of the present application can be: a pulse width modulation (PWM) controller, a central processing unit (CPU), other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates and transistor logic devices, etc.

[0180] Those skilled in the art will appreciate that all or part of the steps in the above embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, magnetic disks, or optical disks.

[0181] Those skilled in the art will understand that, in order to facilitate the explanation of the technical solution of the present application, the embodiments of the present application are described separately through functional modules, and the circuit devices in each module may partially or completely overlap, which does not limit the scope of protection of the present application.

[0182] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A printing control method for a 3D printing device, characterized in that: include: Obtaining model data of a 3D model to be printed; Determining a printing mode for the 3D model based on the model data; wherein the printing mode includes one of a first printing mode and a second printing mode, and the 3D printing device uses different temperature control methods in the first printing mode and the second printing mode; Printing at least one slice layer of the 3D model in sequence according to the model data and the printing mode to obtain the 3D model; The step of printing at least one slice layer of the 3D model in sequence according to the model data and the printing mode to obtain the 3D model includes: Determining layer image data of each slice layer in the at least one slice layer according to the model data and the printing mode; wherein the layer image data includes layer image data of the model region and layer image data of the heat preservation region, or the layer image data includes layer image data of the model region; determining printing data of the 3D model based on the layer image data of each slice layer in the at least one slice layer; when the printing mode is determined to be the first printing mode, the layer image data includes the layer image data of the model area and the layer image data of the heat preservation area, and the printing data includes the layer printing data of the model area and the layer printing data of the heat preservation area; when the printing mode is determined to be the second printing mode, the layer image data includes the layer image data of the model area, and the printing data includes the layer printing data of the model area; At least one slice layer of the 3D model is printed sequentially according to the printing data to obtain the 3D model.

2. The method according to claim 1, characterized in that The printing mode of the 3D model includes a printing mode of at least one slice layer of the 3D model.

3. The method according to claim 2, characterized in that The step of printing at least one slice layer of the 3D model in sequence according to the model data and the printing mode to obtain the 3D model comprises: According to the printing mode of each of the at least one slice layer and the layer model data of each of the slice layer in the model data, each of the at least one slice layer is printed in sequence to obtain the 3D model.

4. The method according to claim 1, wherein Determining the printing mode of the 3D model according to the model data includes: The printing mode of the 3D model determined by the user according to the model data is received through the operation interface.

5. The method according to claim 1, wherein Determining the printing mode of the 3D model according to the model data includes: The model data is matched with the preset model data stored in the database to obtain a printing mode of the 3D model.

6. The method according to claim 2 or 3, characterized in that Determining the printing mode of the 3D model according to the model data includes: determining at least one slice layer of the 3D model; A printing mode of the at least one slice layer is determined according to the layer model data of the at least one slice layer.

7. The method according to claim 6, characterized in that The determining, based on the layer model data of the at least one slice layer, a printing mode of the at least one slice layer comprises: Matching the layer model data of each of the at least one slice layer with the preset layer model data stored in the database to obtain a printing mode for the at least one slice layer; Alternatively, an image contour of the at least one slice layer is determined according to the layer model data of the at least one slice layer; the image contour of each slice layer in the at least one slice layer is matched with a preset model layer contour stored in a database to obtain a printing mode for the at least one slice layer; Alternatively, the area of ​​the at least one slice layer is determined according to the layer model data of the at least one slice layer; and the printing mode of the at least one slice layer is obtained according to the area of ​​each slice layer in the at least one slice layer.

8. The method according to claim 1, characterized in that Before determining the layer image data of each slice layer in the at least one slice layer according to the model data and the printing mode, the method further includes: When the printing mode is determined to be the first printing mode, the printing mode of at least one previous slice layer is determined to be the first printing mode.

9. The method according to claim 8, characterized in that The previous slice layer includes slice layers within N layers before the current slice layer, where N≥50.

10. The method according to claim 1, characterized in that Before determining the layer image data of each slice layer in the at least one slice layer according to the model data and the printing mode, the method further includes: When the printing mode is the second printing mode, determining the printing mode of a specified number of subsequent slice layers; When the printing mode of at least one subsequent slice layer among the specified number of subsequent slice layers is the first printing mode, it is determined that the printing mode of the current slice layer is the first printing mode.

11. The method according to claim 10, characterized in that The subsequent slice layer includes slice layers within M layers after the current slice layer, where M≤50.

12. The method according to claim 1, characterized in that The step of sequentially printing at least one slice layer of the 3D model according to the printing data to obtain the 3D model includes: For each of the at least one slicing layer, a powder material layer is formed using powder material, and liquid material is sprayed on the powder material layer according to the printing data to form the slicing layer, thereby obtaining the 3D model according to the formed at least one slicing layer.

13. The method according to claim 12, characterized in that When the printing mode is determined to be the first printing mode, spraying liquid material on the powder material layer according to the printing data to form the slice layer includes: spraying a first liquid material on the powder material layer according to layer printing data of the model region of the slicing layer, and spraying a second liquid material according to layer printing data of the heat preservation region of the slicing layer to form the slicing layer; The first liquid material and the second liquid material are different liquid materials; or the first liquid material and the second liquid material are the same liquid material, and the amount of the second liquid material sprayed per unit area is lower than the amount of the first liquid material sprayed.

14. The method according to claim 13, characterized in that The second liquid material is a heat storage material.

15. The method according to claim 12, characterized in that When the printing mode is determined to be the second printing mode, spraying liquid material on the powder material layer according to the printing data to form the slice layer includes: The slicing layer is formed by spraying a first liquid material on the powder material layer according to the layer printing data of the model region of the slicing layer.

16. The method according to any one of claims 12 to 15, characterized in that: The method further comprises providing radiation to the powder material layer to preheat the powder material layer before spraying the liquid material on the powder material layer; And / or, after spraying the liquid material on the powder material layer, the method further includes providing radiation to the powder material layer to form a solidified slice layer.

17. The method according to claim 1, wherein There is a gap between the mold area and the heat preservation area.

18. A 3D printing device, characterized in that: The method comprises a control device, wherein the control device is used to execute the method according to any one of claims 1 to 17.

19. A printing control device for a 3D printing device, characterized in that: Used to perform the method according to any one of claims 1 to 17.

20. An electronic device, characterized in that: include: at least one processor and memory; The memory stores computer instructions; when the at least one processor executes the computer instructions stored in the memory, the at least one processor performs the method according to any one of claims 1 to 17.

21. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and when a processor executes the computer instructions, the method according to any one of claims 1 to 17 is implemented.

22. A computer program product comprising a computer program, characterized in that When the computer program is executed, the method according to any one of claims 1 to 17 is implemented.

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