Method, apparatus and device for three-dimensional printing of color objects and storage medium

Abstract

The application provides a three-dimensional printing method, device and equipment of a color object and a storage medium, and is applied to the technical field of three-dimensional printing. A three-dimensional digital model of a color object to be printed is subjected to slicing and layering processing to obtain a plurality of slice layer images, and the slice layer images are divided into a map area, an isolation area and an internal filling area. When printing a layer of the color object based on layer printing data, the isolation area is printed using a predetermined proportion of white material and target material, and the internal filling area is printed using at least one of color material and white material in combination with the target material. By combining the use of target material with high rigidity and low toughness, color material with low rigidity and high toughness and white material, the finally formed color object has sufficient rigidity and toughness under the premise of ensuring bright and realistic colors, improves the three-dimensional printing success rate and service life of the color object, reduces the development difficulty and cost of a single material, and reduces the three-dimensional printing cost of the color object.

Description

Technical Field

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

[0002] 3D printing technology is a type of rapid prototyping technology, also known as additive manufacturing technology. It is a technology that uses digital model files as a basis and employs curable resin materials to construct objects by printing layer by layer.

[0003] In related technologies, 3D printing methods acquire a digital model of a 3D object, slice the digital model into layers, and process and convert the data of each slice layer to obtain the layer printing data of each slice layer. The printing device then uses a curable resin material to print layer by layer and stack the layers to create a 3D object based on the layer printing data of the slice layers.

[0004] However, the performance of current curable resin materials has certain limitations, resulting in printed three-dimensional objects that are prone to deformation or brittleness, failing to meet usage requirements. Summary of the Invention

[0005] This application provides a method, apparatus, device, and storage medium for 3D printing of colored objects, which improves the vibrancy and realism of the printed object's colors, as well as the supporting strength and toughness of the printed object to meet usage requirements, resulting in a durable object.

[0006] In a first aspect, this application provides a method for 3D printing of a colored object, comprising:

[0007] Obtain a 3D digital model of the object to be printed in color;

[0008] The three-dimensional digital model is sliced ​​and layered to obtain multi-layer slice images. Each slice image includes a texture area, an internal filling area, and an isolation area, with the isolation area located between the texture area and the internal filling area.

[0009] Image processing is performed on the sliced ​​layer image to obtain the layer printing data corresponding to the sliced ​​layer image;

[0010] Based on the layer printing data, the slice layer corresponding to the slice layer image is printed to obtain the layer of the colored object to be printed. The texture area is printed using at least one colored material; the isolation area is printed using a predetermined ratio of white material and target material; the internal filling area is printed using at least one of colored material and white material, combined with the target material; the rigidity of the target material is greater than that of the colored material, and the toughness of the target material is less than that of the colored material.

[0011] Layers of a printed colored object are stacked one on top of another to obtain a three-dimensional colored object.

[0012] In one possible implementation, the thickness of the above-mentioned textured area is set to 0.2 mm to 1.5 mm, and / or the thickness of the above-mentioned isolation area is set to 0.1 mm to 1 mm.

[0013] In one possible implementation, the aforementioned isolation area is printed using a predetermined ratio of white material and target material, including:

[0014] The isolation area is printed using white material, or the isolation area is printed using a combination of white material and target material, with the proportion of white material being greater than that of target material; the rigidity of the target material is greater than that of the white material, and the toughness of the target material is less than that of the white material.

[0015] In one possible implementation, the aforementioned rigidity is measured by bending strength and bending modulus, and the target material satisfies a first condition, which includes: bending strength greater than 70 MPa and bending modulus greater than 2000 MPa.

[0016] Both colored and white materials meet the second condition, which includes a flexural strength of 25 MPa to 30 MPa and a flexural modulus of 500 MPa to 1000 MPa.

[0017] In one possible implementation, the aforementioned toughness is measured by notched impact strength; the notched impact strength of the target material is 15 J / m to 25 J / m;

[0018] The notched impact strength of both colored and white materials is greater than 50 J / m.

[0019] In one possible implementation, the heat distortion temperature of the target material is 55°C to 90°C, and the heat distortion temperature of the colored and white materials is 30°C to 45°C.

[0020] In one possible implementation, the structural frame is printed using a target material in the aforementioned internal filling area, and colored and / or white materials are filled around the structural frame, wherein the structural frame includes at least one of a grid structure, a columnar structure, a bent structure, and a spiral structure.

[0021] In one possible implementation, the target material is a transparent material.

[0022] In one possible implementation, the above-described slicing and layering process of the three-dimensional digital model to obtain multi-layer slice images includes:

[0023] The three-dimensional digital model is sliced ​​and layered to obtain multiple slice layers and their corresponding slice layer outlines.

[0024] The first contour is generated by extending the slice layer contour inwards from the slice layer contour, and the area between the slice layer contour and the first contour is the texture area.

[0025] The second contour is generated by extending the first contour into the slice layer, and the area between the first contour and the second contour is an isolation area.

[0026] Define the area within the slice layer outline, excluding the texture area and the isolation area, as the internal fill area;

[0027] The slice layer contour, the first contour, and the second contour are mapped to the image according to a preset resolution to obtain the corresponding slice layer image.

[0028] In one possible implementation, the above-described slicing and layering process of the three-dimensional digital model to obtain multi-layer slice images further includes:

[0029] The three-dimensional digital model is sliced ​​and layered to obtain multiple initial slice layer images and the slice layer contours corresponding to the multiple initial slice layer images.

[0030] The first contour is generated by extending the slice layer contour inwards from the slice layer contour, and the area between the slice layer contour and the first contour is the texture area.

[0031] The second contour is generated by extending the first contour into the slice layer, and the area between the first contour and the second contour is an isolation area.

[0032] Define the area within the slice layer outline, excluding the texture area and the isolation area, as the internal fill area; define the initial slice layer image, which includes the texture area, the isolation area, and the internal fill area, as the slice layer image.

[0033] Secondly, this application provides a colored object, comprising: a textured area, an internal filling area, and an isolation area, wherein the isolation area is located between the textured area and the internal filling area; the textured area is printed using at least one colored material; the isolation area is printed using a predetermined ratio of white material and a target material; the internal filling area is printed using at least one of a colored material and a white material, combined with the target material; the rigidity of the target material is greater than the rigidity of the colored material, and the toughness of the target material is less than the toughness of the colored material.

[0034] In one possible implementation, the thickness of the above-mentioned textured area is set to 0.2 mm to 1.5 mm, and / or the thickness of the above-mentioned isolation area is set to 0.1 mm to 1 mm.

[0035] In one possible implementation, the isolation area is printed using a predetermined ratio of white material and target material, including: the isolation area is printed using white material, or the isolation area is printed using a combination of white material and target material, wherein the proportion of white material is greater than the proportion of target material; the rigidity of the target material is greater than the rigidity of the white material, and the toughness of the target material is less than the toughness of the white material.

[0036] In one possible implementation, the aforementioned rigidity is measured by bending strength and bending modulus, and the target material satisfies a first condition, which includes: bending strength greater than 70 MPa and bending modulus greater than 2000 MPa.

[0037] Both colored and white materials meet the second condition, which includes a flexural strength of 25 MPa to 30 MPa and a flexural modulus of 500 MPa to 1000 MPa.

[0038] In one possible implementation, the aforementioned toughness is measured by notched impact strength; the notched impact strength of the target material is 15 J / m to 25 J / m; and the notched impact strength of the colored and white materials is greater than 50 J / m.

[0039] In one possible implementation, the heat distortion temperature of the target material is 55°C to 90°C, and the heat distortion temperature of the colored and white materials is 30°C to 45°C.

[0040] In one possible implementation, the structural frame is printed using a target material in the aforementioned internal filling area, and colored and / or white materials are filled around the structural frame, wherein the structural frame includes at least one of a grid structure, a columnar structure, a bent structure, and a spiral structure.

[0041] In one possible implementation, the target material is a transparent material.

[0042] Thirdly, this application provides a three-dimensional printing apparatus for colored objects, comprising:

[0043] The acquisition module is used to acquire the three-dimensional digital model of the color object to be printed;

[0044] The slicing and layering module is used to slice and layer a 3D digital model to obtain multi-layer slice images. Each slice image includes a texture area, an internal fill area, and an isolation area, with the isolation area located between the texture area and the internal fill area.

[0045] The image processing module is used to process the slice layer image to obtain the layer printing data corresponding to the slice layer image;

[0046] The printing module is used to print slice layers corresponding to slice layer images based on layer printing data to obtain layers of the colored object to be printed. The texture area is printed using at least one colored material; the isolation area is printed using a predetermined ratio of white material and target material; the internal filling area is printed using at least one of colored material and white material, combined with the target material; the rigidity of the target material is greater than the rigidity of the colored material, and the toughness of the target material is less than the toughness of the colored material; and the layers of the colored object to be printed are stacked one by one to obtain a three-dimensional colored object.

[0047] In one possible implementation, the thickness of the above-mentioned textured area is set to 0.2 mm to 1.5 mm, and / or the thickness of the above-mentioned isolation area is set to 0.1 mm to 1 mm.

[0048] In one possible implementation, the isolation area is printed using a predetermined ratio of white material and target material, including: the isolation area is printed using white material, or the isolation area is printed using a combination of white material and target material, wherein the proportion of white material is greater than the proportion of target material; the rigidity of the target material is greater than the rigidity of the white material, and the toughness of the target material is less than the toughness of the white material.

[0049] In one possible implementation, the aforementioned rigidity is measured by bending strength and bending modulus, and the target material satisfies a first condition, which includes: bending strength greater than 70 MPa and bending modulus greater than 2000 MPa.

[0050] Both colored and white materials meet the second condition, which includes a flexural strength of 25 MPa to 30 MPa and a flexural modulus of 500 MPa to 1000 MPa.

[0051] In one possible implementation, the aforementioned toughness is measured by notched impact strength; the notched impact strength of the target material is 15 J / m to 25 J / m; and the notched impact strength of the colored and white materials is greater than 50 J / m.

[0052] In one possible implementation, the heat distortion temperature of the target material is 55°C to 90°C, and the heat distortion temperature of the colored and white materials is 30°C to 45°C.

[0053] In one possible implementation, the structural frame is printed using a target material in the aforementioned internal filling area, and colored and / or white materials are filled around the structural frame, wherein the structural frame includes at least one of a grid structure, a columnar structure, a bent structure, and a spiral structure.

[0054] In one possible implementation, the target material is a transparent material.

[0055] In one possible implementation, the slicing and layering module can be specifically used to: perform slicing and layering processing on a 3D digital model to obtain multiple slice layers and slice layer contours corresponding to each slice layer; generate a first contour by extending the slice layer contours inwards from the slice layer contours, with the area between the slice layer contours and the first contour being a texture area; generate a second contour by extending the first contours inwards from the slice layer contours, with the area between the first contours and the second contour being an isolation area; determine the area within the slice layer contours, excluding the texture area and the isolation area, as the internal filling area; and map the slice layer contours, the first contour, and the second contour to an image according to a preset resolution to obtain a slice layer image of the corresponding slice layer.

[0056] In one possible implementation, the slicing layering module can also be used to: perform slicing layering processing on the three-dimensional digital model to obtain multiple initial slice layer images and slice layer contours corresponding to the multiple initial slice layer images; generate a first contour by extending the slice layer contours inwards from the slice layer contours, with the area between the slice layer contours and the first contour being a texture area; generate a second contour by extending the first contours inwards from the slice layer contours, with the area between the first contours and the second contour being an isolation area; determine the area within the slice layer contours, excluding the texture area and the isolation area, as the internal filling area; and determine the initial slice layer image including the texture area, the isolation area, and the internal filling area as the slice layer image.

[0057] Fourthly, this application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0058] The memory stores the instructions that the computer executes;

[0059] The processor executes computer execution instructions stored in memory, causing the processor to perform the three-dimensional printing method for a colored object as described in any of the first aspects.

[0060] Fifthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the three-dimensional printing method for a colored object as described in any of the first aspects.

[0061] In a sixth aspect, this application provides a computer program product, including a computer program that, when executed, implements a three-dimensional printing method for a colored object as described in any of the first aspects.

[0062] This application provides a method, apparatus, device, and storage medium for 3D printing of colored objects. During the printing process, the colored object is divided into a texture area, an internal filling area, and an isolation area between the texture area and the internal filling area. The isolation area is printed using a predetermined ratio of white material and target material, thereby enhancing the vibrancy and realism of the object's surface color. The internal filling area uses at least one of colored material and white material, combined with the target material, where the rigidity of the target material is greater than that of the colored material, and the toughness of the target material is less than that of the colored material. Because the high-rigidity, low-toughness target material in the internal filling area is combined with the low-rigidity, high-toughness white material and / or colored material, the internal filling area has sufficient rigidity to support the entire colored object, making it less prone to deformation during printing and use. Simultaneously, the internal filling area possesses a certain degree of toughness. The combination of the high-toughness colored material in the texture area and the high-toughness white material in the isolation area results in a highly resilient colored object that will not crack during use. Ultimately, this improves the printing success rate and lifespan of the colored object, reduces the development difficulty and cost of individual materials, thereby lowering the printing cost of the colored object and further expanding the application scope of 3D printing technology. Attached Figure Description

[0063] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0064] Figure 1 An application scenario diagram of the three-dimensional printing method for colored objects provided in the embodiments of this application;

[0065] Figure 2 A flowchart illustrating a method for 3D printing of a colored object according to an embodiment of this application;

[0066] Figure 3 This is a schematic diagram of the internal filling region structure provided in an embodiment of this application;

[0067] Figure 4 This is a schematic diagram of the structure of a colored object to be printed provided in an embodiment of this application;

[0068] Figure 5 A schematic diagram of the outline structure of a sliced ​​layer of a colored object to be printed, provided in an embodiment of this application;

[0069] Figure 6 This is a schematic diagram of the outline structure of a sliced ​​layer after region division, provided in an embodiment of this application;

[0070] Figure 7 A schematic diagram of slice layer images including different regions is provided for an embodiment of this application;

[0071] Figure 8 A schematic diagram of the structure of a three-dimensional printing apparatus for a colored object provided in an embodiment of this application;

[0072] Figure 9 A schematic diagram of the structure of a three-dimensional printing apparatus for a colored object provided in another embodiment of this application;

[0073] Figure 10 A schematic diagram of the structure of a three-dimensional printing apparatus for a colored object provided in another embodiment of this application;

[0074] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0075] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0076] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0077] The terms “first,” “second,” etc. (if present) in the specification, claims, and drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such use of data can be interchanged where appropriate so that the implementations of this application described herein can be implemented, for example, in sequences other than those illustrated or described herein.

[0078] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application.

[0079] There are many types of existing 3D object printing devices and materials suitable for 3D object printing. However, all materials have certain limitations: materials with high rigidity are generally brittle, making the printed 3D objects prone to fracture; while materials with good elasticity have low rigidity, making it difficult to support the printed 3D object during the printing process, leading to deformation. Taking the printing of color objects with a 3D inkjet printer as an example, printing color objects usually requires the use of at least two materials. In order to obtain 3D color objects with both color and mechanical properties that meet the usage requirements, users have high requirements for the performance of the materials used. This increases the difficulty and cost of material development and the overall cost of 3D printing color objects.

[0080] To address the aforementioned issues, this application provides a method, apparatus, device, and storage medium for 3D printing of colored objects. By combining materials with different rigidities and toughnesses, using materials with low rigidity and high toughness in the thinner texture and isolation areas, and combining materials with high rigidity and low toughness as well as materials with high toughness and low rigidity in the larger internal filling areas, the resulting 3D colored object exhibits sufficient support strength and toughness to meet usage requirements. The 3D colored object will not deform, is not easily brittle, and has a long service life. This reduces the development difficulty and cost of individual materials, thereby lowering the printing cost of 3D colored objects and further expanding the application scope of 3D printing technology. Furthermore, this application divides the printed object into three regions, with the texture area and internal filling area separated by an isolation area containing white material, which improves the color vibrancy and realism of the colored object.

[0081] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0082] Figure 1 This diagram illustrates an application scenario of the 3D printing method for colored objects provided in this embodiment of the application. Please refer to [link / reference]. Figure 1 The terminal device 103 acquires a three-dimensional digital model of the colored object to be printed, performs slicing and layering processing on the three-dimensional digital model to obtain multi-layer slice images, performs image processing on the slice images to obtain layer printing data, and sends the layer printing data to the controller 102. The controller 102 controls each component of the printer 101 to perform printing operations to form a three-dimensional colored object based on the layer printing data.

[0083] It should be noted that, Figure 1The application scenarios shown are for illustrative purposes only. The terminal device 103 can be a wearable device, mobile phone, computer, laptop, personal digital assistant (PDA), microcomputer, or cloud server, etc., and there is no limit to the number of terminal devices 103. The printer 101 can be any printing device that uses curable resin material and has 3D printing capabilities. Optionally, the controller 102 can be included in the printer 101.

[0084] Figure 2 This is a schematic flowchart illustrating a method for 3D printing a colored object according to an embodiment of this application. Please refer to... Figure 2 The method for 3D printing this colored object includes:

[0085] S201. Obtain the three-dimensional digital model of the color object to be printed.

[0086] The object to be printed can be a three-dimensional object of any shape or structure. The three-dimensional digital model can include one or more of the following data: structural data, positional data, size data, color data, density data, elasticity data, and rigidity data of the three-dimensional object.

[0087] Specifically, the three-dimensional digital model of the colored object to be printed can be a three-dimensional digital model obtained by scanning the object with a scanner and then reconstructing it; a three-dimensional digital model can be downloaded from a data platform; a three-dimensional digital model of the object to be printed can be obtained by drawing the object with drawing software; or a three-dimensional digital model obtained by other means.

[0088] It should be noted that those skilled in the art can use relevant technologies or tools to obtain a three-dimensional digital model of the object to be printed. This application does not list them all. In the embodiments of this application, the three-dimensional digital model includes the structural information and color information of the object to be printed.

[0089] S202. Perform slicing and layering processing on the three-dimensional digital model to obtain multi-layer slice images. The slice images include texture areas, internal filling areas, and isolation areas. The isolation areas are located between the texture areas and the internal filling areas.

[0090] In this step, slicing software can be used to slice the 3D digital model, resulting in multi-layer slice images. The texture area, with its attached colored material, is the outermost layer of the 3D object; the internal filling area refers to the internal structural area of ​​the 3D digital model, providing structural support to ensure the object has sufficient strength and prevent deformation; the isolation area acts as a background, located inside the texture area and outside the internal filling area.

[0091] In one feasible approach, slicing a 3D digital model into layers can yield a multi-layered image containing textured regions, internal filling regions, and isolated regions.

[0092] S203. Perform image processing on the slice layer image to obtain the layer printing data corresponding to the slice layer image.

[0093] Optionally, image processing refers to digital image processing, also known as "data processing." Commonly used image processing techniques include image blurring, image enhancement, image encoding, color conversion, and halftone processing. In practical applications, appropriate image processing techniques can be selected based on different needs. Optionally, image processing is performed on slice layer image data to obtain layer printing data, such as color conversion and halftone processing on slice layer images.

[0094] S204. Based on the layer printing data, print the slice layer corresponding to the slice layer image to obtain the layer of the colored object to be printed. The texture area is printed using at least one colored material; the isolation area is printed using a predetermined ratio of white material and target material; the internal filling area is printed using at least one of colored material and white material, combined with the target material; the rigidity of the target material is greater than the rigidity of the colored material, and the toughness of the target material is less than the toughness of the colored material.

[0095] Specifically, the 3D printing equipment can be controlled to print multiple layers of a colored object to be printed based on the layer printing data. In the embodiments of this application, the 3D printing equipment can employ inkjet printing technology, specifically inkjet UV curing 3D printing technology, inkjet thermosetting 3D printing technology, and so on.

[0096] Among these, the rigidity of a material refers to its resistance to deformation and its supporting capacity in the final three-dimensional colored object, while the toughness of the material refers to its brittleness. Sufficient rigidity is generally required to support the entire colored object, while sufficient toughness is necessary to prevent the object from cracking during use.

[0097] S205. Layers of the printed color object are stacked one by one to obtain a three-dimensional color object.

[0098] In this embodiment of the application, during the 3D printing process of a colored object, the sliced ​​layer image is divided into a texture area, an isolation area, and an internal filling area. By combining a target material with high rigidity and low toughness, a colored material with low rigidity and high toughness, and a white material, the isolation area is printed using a predetermined ratio of white material and target material; the internal filling area uses at least one of colored material and white material, combined with the target material for printing; the final colored object has sufficient rigidity and toughness while ensuring vivid and realistic colors, improving the success rate and lifespan of 3D printing of colored objects, reducing the development difficulty and cost of individual materials, thereby reducing the cost of 3D printing of colored objects, and further expanding the application scope of 3D printing technology.

[0099] In one possible implementation, the thickness of the above-mentioned textured area is set to 0.2 mm to 1.5 mm, and / or the thickness of the above-mentioned isolation area is set to 0.1 mm to 1 mm.

[0100] It is understandable that the thickness settings of the texture area and the thickness settings of the isolation area can both meet the conditions mentioned above, or only one of them needs to be met. When both conditions are met, the beneficial effect is maximized.

[0101] In this embodiment of the application, by controlling the thickness of the textured area within a specified range, the use of color material is reduced while ensuring the color vibrancy and realism of the printed object and providing sufficient toughness for the printed object. Since the cost of color material is usually higher than that of other color materials, reducing the use of color material can reduce the printing cost of color objects.

[0102] In this embodiment, by controlling the thickness of the isolation area within a specified range, sufficient toughness is provided for the printed object while ensuring an opaque background for the color representation of the colored object.

[0103] Furthermore, the aforementioned isolation area is printed using a predetermined ratio of white material and target material, which may include: the isolation area is printed using white material, or the isolation area is printed using a combination of white material and target material, wherein the proportion of white material is greater than the proportion of target material; the rigidity of the target material is greater than the rigidity of the white material, and the toughness of the target material is less than the toughness of the white material.

[0104] In this embodiment, by using only white material in the isolation area, or by using a mixture of white material and target material with the white material accounting for a larger proportion than the target material, the vibrancy and realism of the color representation of the colored object can be further guaranteed, and the toughness of the printed object can be further improved.

[0105] Based on the above embodiments, the above rigidity is measured by bending strength and bending modulus, and the target material satisfies the first condition, which includes: bending strength greater than 70MPa and bending modulus greater than 2000MPa;

[0106] Both colored and white materials meet the second condition, which includes a flexural strength of 25 MPa to 30 MPa and a flexural modulus of 500 MPa to 1000 MPa.

[0107] For example, the flexural strength of the target material can be an integer such as 71MPa, 72MPa, ..., or any value greater than 70MPa; the flexural modulus of the target material can be an integer such as 2001MPa, 2002MPa, ..., or any value greater than 2000MPa; the flexural strength of the colored material and the white material are each independently selected from any value between 25MPa and 30MPa, and the flexural strength can be an integer or a decimal; the flexural modulus of the colored material and the white material are each independently selected from any value between 500MPa and 1000MPa, and the flexural modulus can be an integer or a decimal.

[0108] In some embodiments, the toughness described above is measured by notched impact strength; the notched impact strength of the target material is 15 J / m to 25 J / m; and the notched impact strength of the colored and white materials is greater than 50 J / m.

[0109] For example, the notched impact strength of the target material can be 15 J / m, 16 J / m, ..., 25 J / m, and any decimal between any two of the listed values; the notched impact strengths of the colored material and the white material are each independently selected from any value greater than 50 J / m, and the notched impact strength can be an integer or a decimal.

[0110] In some embodiments, the heat distortion temperature of the target material is 55°C to 90°C, and the heat distortion temperature of the colored material and the white material is 30°C to 45°C.

[0111] The heat distortion temperature reflects the creep resistance of the printed object. For example, the heat distortion temperature of the target material can be 55°C, 56°C, ..., 60°C, ..., 90°C, and any decimal between any two of the listed values. The heat distortion temperatures of the colored material and the white material are each independently selected from any temperature value between 30°C and 45°C. The temperature value can be an integer or a decimal.

[0112] In this embodiment, by further limiting the heat distortion temperature of the target material, colored material, and white material within a specified range, the colored object exhibits good creep resistance while satisfying the requirements for color vibrancy, realism, support strength, and toughness.

[0113] In one possible implementation, the target material is a transparent material. In this embodiment, the transparent material contains little or no colorant. Compared to materials of other colors with the same rigidity and toughness as the transparent material, the transparent material is relatively inexpensive, thus saving on material usage costs.

[0114] Furthermore, in one possible implementation, the structural frame is printed using the target material in the aforementioned internal filling area, and colored and / or white materials are filled around the structural frame, wherein the structural frame includes at least one of a grid structure, a columnar structure, a bent structure, and a spiral structure.

[0115] Combination Figure 3 The internal filling region structure diagram illustrates this embodiment. Figure 3 (a) is a cross-sectional view of the XY plane of the internal filling area of ​​the printed object. The black diagonal lines in the figure represent the mesh structure printed using the target material, and the white material is scattered around the black diagonal line mesh structure. Figure 3 (b) is a cross-sectional view of the XZ plane of the internal filling area of ​​the printed object. The black diagonal lines in the figure represent the columnar structure printed using the target material, and the white material is scattered around the black diagonal columnar structure. Figure 3 (c) is a cross-sectional view of the XZ-axis plane of the internal filling area of ​​the printed object. The black diagonal lines in the figure represent the bent structure printed using the target material, and the white material is scattered around the black diagonal bent structure.

[0116] In this embodiment, a structural frame is printed in the internal filling area by using a target material, i.e., a third material other than white and colored materials. The white or colored materials are dispersed around the target material, which not only provides sufficient support strength for the three-dimensional object but also maintains a certain degree of toughness.

[0117] For example, the properties of the materials used in this application can be tested by the following methods:

[0118] 1. Heat distortion temperature test.

[0119] Colored, white, and transparent materials were applied to a Sailner 3D inkjet printer to print samples of the dimensions required by GB / T1634-2004. The heat distortion temperatures of the colored, white, and transparent materials were tested according to the methods in GB / T1634-2004.

[0120] 2. Bending strength and bending modulus tests.

[0121] The colored, white, and transparent materials in this embodiment were applied to a Sailner 3D inkjet printer to print samples of the dimensions required by GB / T9341-2008. The flexural strength and flexural modulus of the colored, white, and transparent materials were tested respectively according to the method in GB / T9341-2008.

[0122] 3. Notched impact strength test

[0123] The colored, white, and transparent materials in this embodiment are applied to a 3D inkjet printer to print specimens of the dimensions required by ASTM D256-10. The notched impact strength of the colored, white, and transparent materials is then tested according to the method in ASTM D256-10.

[0124] Table 1 lists the performance data of each material used in combination, as shown in Table 1.

[0125] Table 1

[0126]

[0127] For example, using the materials in Examples 1 to 4, print specimens of the dimensions required by the corresponding parameter testing standards (GB / T1634-2004, GB / T9341-2008, and ASTM D256-10). The target material (i.e., the third material) in the internal filling area is required to print a columnar structure, with white material dispersed around the columnar structure. The thickness of the mapping area is set to 1 mm, the thickness of the isolation area is set to 0.6 mm, and the side length of the columnar structure is 0.8 mm. The isolation area is printed with white material, and the mapping area is printed with colored material.

[0128] As a comparative example, samples of the required dimensions in the corresponding parameter testing standard were printed using the materials in Example 1. In Comparative Example 1, only white material was used for printing the internal filling area, while in Comparative Example 2, only the target material was used for printing the internal filling area. The materials used for other areas were the same as in Example 1.

[0129] As a comparative example, samples of the required dimensions in the corresponding parameter testing standard were printed using the materials in Example 2. In Comparative Example 3, only white material was used for printing the internal filling area, and in Comparative Example 4, only the target material was used for printing the internal filling area. The materials used for other areas were the same as in Example 1.

[0130] As a comparative example, samples of the required dimensions in the corresponding parameter testing standard were printed using the materials in Example 3. In Comparative Example 5, only white material was used for printing the internal filling area, and in Comparative Example 6, only the target material was used for printing the internal filling area. The materials used for other areas were the same as in Example 1.

[0131] As a comparative example, samples of the required dimensions in the corresponding parameter testing standard were printed using the materials in Example 4. In Comparative Example 7, only white material was used for printing the internal filling area, and in Comparative Example 8, only the target material was used for printing the internal filling area. The materials used for other areas were the same as in Example 1.

[0132] As a comparative example, using the materials in Example 1, the texture area in Comparative Example 9 is printed with the target material, the isolated area is printed with the white material, and the internal filling area is printed with the target material to form a columnar structure, with the white material scattered around the columnar structure.

[0133] The specimens printed in Examples 1-4 (the texture area is printed with colored material, the internal filling area is printed with the target material to form a columnar structure, and white material is scattered around the columnar structure), Comparative Examples 1-8 (the texture area is printed with colored material, the internal filling area uses only white material or the target material), and Comparative Example 9 (the texture area is printed with the target material, the internal filling area is printed with the target material to form a columnar structure, and white material is scattered around the columnar structure) were subjected to bending strength test, bending modulus test, heat distortion temperature test, notched impact strength test, and bending resistance test. The bending resistance test was conducted using specimens with the dimensions required for the heat distortion temperature test. The test results are shown in Table 2.

[0134] Table 2

[0135]

[0136] The test results above show that by using the third material (i.e., the target material), colored material, and white material specified in this application, and combining the use of the target material with high rigidity and low toughness, and the white material with good toughness and low rigidity in the large internal filling area, and using the colored material with good toughness and low rigidity in the mapping area, the final three-dimensional object has sufficient support strength and toughness to meet the usage requirements. The object is not easily deformed or brittle, and has a long service life. Furthermore, by limiting the heat deformation temperature, the creep resistance of the object is improved.

[0137] Alternatively, the internal filling area can also be filled with a combination of colored and target materials, with similar beneficial effects as when white and target materials are used together, which will not be elaborated here.

[0138] It should be noted that colored, white, and transparent materials can all be either photocurable or thermocurable.

[0139] Alternatively, a material combining photocuring and thermocuring may be used, and the specific choice of material is not limited in this application; the colored materials in this application include cyan (C), magenta (M), yellow (Y), and black (BK) materials, as well as at least one of other secondary and tertiary color materials.

[0140] In one possible implementation, the above-described slicing and layering process of the three-dimensional digital model to obtain multi-layer slice images includes:

[0141] Step 1-1: Perform slicing and layering processing on the 3D digital model to obtain multiple slice layers and their corresponding slice layer outlines.

[0142] like Figure 4 As shown, the 3D digital model of the object to be printed is sliced ​​and layered in the Z direction. The slicing is performed from bottom to top to obtain the slice layer contour data corresponding to the multiple model regions. In the figure, L... n It is the nth slice layer of the 3D digital model, L n-i It is the nth slice layer of the 3D digital model, located before the nth slice layer, L n+i It is the (n+i)th slice layer of the 3D digital model, located after the nth slice layer. Let slice layer L... n For example, after slicing and layering the 3D digital model of the object to be printed in color, the slice layer L... n Perform analysis and processing. Figure 5 This is a schematic diagram of the outline structure of a slice layer of a colored object to be printed according to an embodiment of this application. The slice layer L n The outline is a parallelogram with four sides L. n0 .

[0143] Step 1-2 generates a first contour by extending the slice layer contour inwards from the slice layer contour. The area between the slice layer contour and the first contour is the texture area.

[0144] Based on step 1-1, based on slice layer L n The outline L n0 The first contour is generated by extending inwards towards the slice layer. Figure 6 This is a schematic diagram of the outline structure of a sliced ​​layer after region division, provided in one embodiment of this application. Figure 6 As shown, the internal direction of the slice layer is Figure 6 The direction indicated by the middle arrow, the first outline is L n1 Determine the slice layer contour L n0 With the first contour L n1 The area between them is the texture area T1.

[0145] Steps 1-3 extend the first contour inwards towards the slice layer to generate the second contour, and the area between the first contour and the second contour is the isolation area.

[0146] Based on steps 1-2, and based on the first contour L n1 The second contour L is generated by extending into the slice layer. n2 Determine the first contour L n1 With the second contour L n2 The area between them is the isolation area T2, such as Figure 6 The blank area is shown in the middle.

[0147] Steps 1-4 define the area within the slice layer outline, excluding the texture area and the isolation area, as the internal fill area.

[0148] Determine the slice layer L corresponding to the model region n The area above, excluding the texture area T1 and the isolation area T2, is the internal filling area T3, such as... Figure 6 As shown in the medium grid area.

[0149] Steps 1-5 map the slice layer outline, the first outline, and the second outline to the image according to a preset resolution to obtain the slice layer image of the corresponding slice layer.

[0150] For example, the preset resolution can be set by the user, or set according to the accuracy of the 3D model of the object to be printed, or consistent with the printing resolution of the 3D printing equipment.

[0151] like Figure 7 This is a schematic diagram of a slice layer image including different regions, provided as an embodiment of this application. For example... Figure 7 As shown, the slice layer image is a bitmap image, including the surface mapping region T1, the middle isolation region T2, and the internal filling region T3.

[0152] In another possible implementation, the above-described slicing and layering process of the three-dimensional digital model to obtain multi-layer slice images may further include:

[0153] Step 2-1: Perform slicing and layering processing on the three-dimensional digital model to obtain multiple initial slice layer images and the slice layer contours corresponding to the multiple initial slice layer images respectively;

[0154] The slice layer image is a bitmap image, composed of several voxels.

[0155] Step 2-2: Generate a first contour by extending it inward from the slice layer contour. The area between the slice layer contour and the first contour is the texture area.

[0156] The steps are the same as in steps 1-2, so they will not be repeated here.

[0157] Steps 2-3: Generate a second contour by extending the first contour inwards towards the slice layer; the area between the first contour and the second contour is an isolation area.

[0158] The steps are the same as those in steps 1-3, so they will not be repeated here.

[0159] Steps 2-4: Determine the area within the slice layer outline, excluding the texture area and the isolation area, as the internal fill area; define the initial slice layer image, including the texture area, the isolation area, and the internal fill area, as the slice layer image.

[0160] The steps are the same as those in steps 1-4, so they will not be repeated here.

[0161] The following is an embodiment of the colored object of this application, and the colored object can be printed using the above-described three-dimensional printing method for colored objects.

[0162] The colored object includes: a textured area, an internal filling area, and an isolation area, with the isolation area located between the textured area and the internal filling area; the textured area is printed using at least one colored material; the isolation area is printed using a predetermined ratio of white material and a target material; the internal filling area is printed using at least one of a colored material and a white material, combined with the target material; the rigidity of the target material is greater than that of the colored material, and the toughness of the target material is less than that of the colored material.

[0163] The thickness of the texture area is set to 0.2mm to 1.5mm, and / or the thickness of the isolation area is set to 0.1mm to 1mm.

[0164] The isolation area is printed using a predetermined ratio of white material and target material, which may include: the isolation area is printed using white material, or the isolation area is printed using a combination of white material and target material, wherein the proportion of white material is greater than the proportion of target material; the rigidity of the target material is greater than the rigidity of the white material, and the toughness of the target material is less than the toughness of the white material.

[0165] Among them, rigidity is measured by bending strength and bending modulus. The target material meets the first condition, which includes: bending strength greater than 70MPa and bending modulus greater than 2000MPa.

[0166] Both colored and white materials meet the second condition, which includes a flexural strength of 25 MPa to 30 MPa and a flexural modulus of 500 MPa to 1000 MPa.

[0167] In addition, toughness is measured by notched impact strength; the notched impact strength of the target material is 15 J / m to 25 J / m; the notched impact strength of the colored and white materials is greater than 50 J / m.

[0168] The heat distortion temperature of the target material is 55℃ to 90℃, and the heat distortion temperature of the colored and white materials is 30℃ to 45℃.

[0169] The internal infill area is printed with a structural frame using the target material, and colored and / or white materials are used to fill the area around the structural frame. The structural frame includes at least one of a grid structure, a columnar structure, a bent structure, and a spiral structure. The target material is transparent.

[0170] For example, in one embodiment of this application, the material in Example 1 listed above is used to print a colored object using the above-described three-dimensional printing method for colored objects. The colored object includes a texture area, an inner filling area, and an isolation area located between the texture area and the inner filling area. The texture area is formed using at least one colored material, the isolation area is formed using a white material, the inner filling area is formed using a combination of white material and a target material, and the target material is a transparent material that forms a columnar structure. The white material is dispersed around the transparent material. The thickness of the texture area is 0.2 mm, and the thickness of the isolation area is 0.1 mm.

[0171] Optionally, in another embodiment of this application, the material in Example 2 listed above is used to print a colored object using the above-described method for 3D printing of colored objects. The colored object includes a texture area, an inner filling area, and an isolation area between the texture area and the inner filling area. The texture area is formed using at least one colored material, the isolation area is formed using a mixture of white material and target material, such as a white material to target material ratio of 7:3, the inner filling area is formed using a combination of colored material and target material, and the target material is a transparent material forming a mesh structure. The colored material is dispersed around the transparent material. The thickness of the texture area is 1.5 mm, and the thickness of the isolation area is 1 mm.

[0172] In this embodiment, the target material in the color object filling area can also be presented in other structures listed above. The thickness of the texture area can be any value between 0.2mm and 1.5mm or greater than 1.5mm, and the thickness of the isolation area can be any value between 0.1mm and 1mm or greater than 1mm. These are not listed one by one here.

[0173] The colored object provided in this application embodiment can be printed by the above-described three-dimensional printing method for colored objects. Its implementation principle and beneficial effects are similar, and will not be repeated here.

[0174] The following are embodiments of the apparatus described in this application, which can be used to execute the embodiments of the method described in this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method described in this application.

[0175] Figure 8 This is a schematic diagram of the structure of a three-dimensional printing apparatus for a colored object provided in an embodiment of this application. Figure 8 As shown, the 3D printing device 800 for the colored object includes: an acquisition module 801, a slicing and layering module 802, an image processing module 803, and a printing module 804. Wherein:

[0176] The acquisition module 801 is used to acquire the three-dimensional digital model of the color object to be printed;

[0177] The slicing and layering module 802 is used to perform slicing and layering processing on the three-dimensional digital model to obtain multi-layer slice images. The slice image includes a texture area, an internal filling area, and an isolation area. The isolation area is located between the texture area and the internal filling area.

[0178] Image processing module 803 is used to perform image processing on slice layer images to obtain layer printing data corresponding to slice layer images;

[0179] The printing module 804 is used to print the slice layer corresponding to the slice layer image based on the layer printing data to obtain the layer of the color object to be printed. The texture area is printed using at least one color material; the isolation area is printed using a predetermined ratio of white material and target material; the internal filling area is printed using at least one of color material and white material, combined with the target material; the rigidity of the target material is greater than the rigidity of the color material, and the toughness of the target material is less than the toughness of the color material; and the layers of the color object to be printed are stacked one by one to obtain a three-dimensional color object.

[0180] In one possible implementation, the thickness of the above-mentioned textured area is set to 0.2 mm to 1.5 mm, and / or the thickness of the above-mentioned isolation area is set to 0.1 mm to 1 mm.

[0181] In one possible implementation, the isolation area is printed using a predetermined ratio of white material and target material, including: the isolation area is printed using white material, or the isolation area is printed using a combination of white material and target material, wherein the proportion of white material is greater than the proportion of target material; the rigidity of the target material is greater than the rigidity of the white material, and the toughness of the target material is less than the toughness of the white material.

[0182] In one possible implementation, the aforementioned rigidity is measured by bending strength and bending modulus, and the target material satisfies a first condition, which includes: bending strength greater than 70 MPa and bending modulus greater than 2000 MPa.

[0183] Both colored and white materials meet the second condition, which includes a flexural strength of 25 MPa to 30 MPa and a flexural modulus of 500 MPa to 1000 MPa.

[0184] In one possible implementation, the aforementioned toughness is measured by notched impact strength; the notched impact strength of the target material is 15 J / m to 25 J / m; and the notched impact strength of the colored and white materials is greater than 50 J / m.

[0185] In one possible implementation, the heat distortion temperature of the target material is 55°C to 90°C, and the heat distortion temperature of the colored and white materials is 30°C to 45°C.

[0186] In one possible implementation, the structural frame is printed using a target material in the aforementioned internal filling area, and colored and / or white materials are filled around the structural frame, wherein the structural frame includes at least one of a grid structure, a columnar structure, a bent structure, and a spiral structure.

[0187] In one possible implementation, the target material is a transparent material.

[0188] In one possible implementation, the slicing and layering module 802 can be specifically used to: perform slicing and layering processing on the three-dimensional digital model to obtain multiple slice layers and slice layer contours corresponding to each slice layer; generate a first contour by extending the slice layer contours inwards from the slice layer contours, with the area between the slice layer contours and the first contour being a texture area; generate a second contour by extending the first contours inwards from the slice layer contours, with the area between the first contour and the second contour being an isolation area; determine the area within the slice layer contours, excluding the texture area and the isolation area, as the internal filling area; and map the slice layer contours, the first contour, and the second contour to an image according to a preset resolution to obtain the slice layer image corresponding to the slice layer. The preset resolution can be set manually, or according to the accuracy of the three-dimensional model of the object to be printed, or consistent with the printing resolution of the 3D printing device.

[0189] In one possible implementation, the slicing layering module 802 can also be used to: perform slicing layering processing on the three-dimensional digital model to obtain multiple initial slice layer images and slice layer contours corresponding to the multiple initial slice layer images; generate a first contour by extending the slice layer contours inwards from the slice layer contours, with the area between the slice layer contours and the first contour being a texture area; generate a second contour by extending the first contours inwards from the slice layer contours, with the area between the first contours and the second contour being an isolation area; determine the area within the slice layer contours, excluding the texture area and the isolation area, as an internal filling area; and determine the initial slice layer image including the texture area, the isolation area, and the internal filling area as the slice layer image.

[0190] The three-dimensional printing apparatus for colored objects provided in this application embodiment can execute the technical solution shown in the above method embodiment. Its implementation principle and beneficial effects are similar, and will not be repeated here.

[0191] It should be noted that the division of the various modules in the above device is merely a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, these modules can be implemented entirely in software via processing elements; they can be fully implemented in hardware; or some modules can be implemented by processing elements calling software, while others are implemented in hardware. For example, the image processing module can be a separate processing element, or it can be integrated into a chip in the above device. Alternatively, it can be stored as program code in the memory of the above device, and its functions can be called and executed by a processing element. The implementation of other modules is similar. Moreover, these modules can be fully or partially integrated together, or they can be implemented independently. The processing element 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 through the integrated logic circuits in the hardware of the processor element or through software instructions.

[0192] For example, these modules can 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). As another example, when a module is implemented using processing element scheduler code, the processing element can be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together as a System-On-a-Chip (SOC).

[0193] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. 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. For example, 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, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., Digital Video Discs, DVDs), or semiconductor media (e.g., solid-state disks (SSDs)).

[0194] Figure 9 This is a schematic diagram of the structure of a three-dimensional printing apparatus for colored objects provided in another embodiment of this application. Figure 10 This is a schematic diagram of a three-dimensional printing apparatus for a colored object provided in yet another embodiment of this application. (Using...) Figure 9 or Figure 10 The 3D printing apparatus for colored objects can be used to print the colored 3D objects in the aforementioned embodiments. For example... Figure 9 and Figure 10 As shown, the 3D printing apparatus includes a support platform 7, a feeding section, and a radiation source 9. The feeding section is used to provide the aforementioned materials, such as colored materials, white materials, and transparent materials, as well as support materials, to form a material layer 1 of the object to be printed on the support platform 7. The radiation source is used to provide radiation to the material layer 1 so that the material layer 1 is cured to obtain the layer of the object to be printed.

[0195] Specifically, the feeding section includes a print head 3. During the 3D inkjet printing process, the print head 3 sprays material 6 onto the support platform 7 to form a material layer 1 of the object to be printed.

[0196] In addition, the above-mentioned device includes a body 5, which is arranged to form a cavity, and a support platform 7, a feeding section and a radiation source 9 are located in the cavity.

[0197] The feeding section also includes a material box 8 and an ink tube 2. The material box 8, ink tube 2 and print head 3 are connected in sequence. The material box 8 is used to store the material 6 and to transport the material 6 to the print head 3 through the ink tube 2. The print head 3 is used to spray the material 6 onto the support platform 7 to form the material layer 1 of the object to be printed.

[0198] The number of printheads 3 is at least one, that is, there can be one or more, and the printheads 3 can specifically include single-channel printheads 3 and / or multi-channel printheads 3.

[0199] The number of radiation sources 9 can be one or more, for example, two. Generally, radiation sources 9 are present on opposite sides of the printhead 3. For example, when there are two radiation sources 9, the two radiation sources 9 are respectively located on opposite sides of the printhead 3 (e.g., Figure 9 (Left and right sides of printhead 3).

[0200] In practice, after the printhead 3 sprays material 6 onto the support platform 7 to form the material layer 1 of the object to be printed, the radiation source 9 is turned on to provide radiation to the material layer 1. The radiation sources 9 located on opposite sides of the printhead 3 are not turned on simultaneously. Specifically, when the printhead 3 moves to the left for inkjet printing, the radiation source 9 on the right side of the printhead 3 is turned on, and the radiation source 9 on the left side is turned off; when the printhead 3 moves to the right for inkjet printing, the radiation source 9 on the left side of the printhead 3 is turned on, and the radiation source 9 on the right side is turned off. This shortens the curing time of the material layer and improves its curing degree.

[0201] In the embodiments of this application, the radiation source 9 can be an ultraviolet radiation source, an infrared radiation source, a ceramic radiation source, etc., depending on whether the material used is an ultraviolet light curing material or a thermosetting material.

[0202] In some embodiments, the material used is an ultraviolet curable material, and the wavelength of the radiation provided by the radiation source 9 can be 330nm to 410nm, such as 330nm, 350nm, 380nm, 400nm, 410nm or any two of them.

[0203] Specifically, the radiation source 9 may include a light-emitting device capable of providing the aforementioned radiation, such as an ultraviolet light-emitting diode (UV LED) or a UV LED lamp.

[0204] The above-mentioned device may also include a letter carrier 4, which is located in a cavity, for example, movable within the cavity enclosed by the body 5. In some specific embodiments, the above-mentioned device also includes a crossbeam located in the cavity, the crossbeam being fixed to the body 5, and the letter carrier 4 being movably mounted on the crossbeam.

[0205] In this process, the radiation source 9 and the printhead 3 are both mounted on the carriage 4. During printing, the support platform 7 remains stationary in the horizontal direction, while the carriage 4 drives the printhead 3 to move at a constant speed relative to the support platform 7 in the scanning direction. Specifically, in the scanning direction, as the carriage 4 moves to the left, the printhead 3 ejects material 6 onto the support platform 7, forming a material layer 1 of the object to be printed. Simultaneously, the radiation source 9 located to the right of the printhead 3 is activated, providing radiation to the material layer 1 of the object to be printed, causing the photocurable components in the material layer 1 to undergo a polymerization reaction. Next, the carriage 4 moves one step distance (also called one pass distance) in the non-scanning direction (i.e., the stepping direction). Afterward, the carriage 4 moves to the right for inkjet printing. During the rightward movement of the carriage 4, the radiation source 9 located to the right of the printhead 3 is deactivated, while the radiation source 9 located to the left of the printhead 3 is activated. This moving inkjet printing process is repeated until a layer of the object to be printed is formed.

[0206] The aforementioned device may further include a leveling component 11 for leveling the material layer 1 of the object to be printed. The leveling component 11 may be disposed on the carriage 4, for example, between the print head 3 and the radiation source 9, specifically on the right side of the print head 3 (i.e., the side of the print head 3 facing away from the material box 8). The leveling component 11 may include a leveling roller, whose rotation removes excess material 6 distributed to the support platform 7, thereby improving the accuracy of the material layer 1 of the object to be printed and thus improving the forming accuracy of the three-dimensional object.

[0207] In one implementation, such as Figure 9 As shown, the print head 3 and the support platform 7 can move relative to each other in a first direction, which is parallel to the stacking direction of the layers of the three-dimensional object to be printed, and also parallel to the direction from the print head 3 to the support platform 7 (or parallel to the direction from the support platform 7 to the print head 3). Specifically, this can be the height direction of the device, i.e., the vertical direction (i.e., the vertical direction). Figure 9 In the Z direction), after forming a layer of the object to be printed, the print head 3 and the support platform 7 move relative to each other in the first direction to increase the relative distance between them in the first direction, so that there is enough space between them to accommodate new material layers, so as to continuously form layers of the object to be printed, and to stack these layers one by one to form a colored three-dimensional object.

[0208] Specifically, such as Figure 9As shown, the above-mentioned device also includes a lifting component 13 connected to the support platform 7. The lifting component 13 is used to change the relative distance between the support platform 7 and the print head 3 in the first direction. Specifically, it can drive the support platform 7 to move down a certain distance relative to the print head 3 in the first direction to increase the relative distance between the two in the first direction, so that there is enough space between them to accommodate new material layers, so as to continuously form layers of the object to be printed, and to stack these layers one by one to form a colored three-dimensional object.

[0209] like Figure 9 As shown, the lifting component 13 and the print head 3 are located on opposite sides of the support platform 7. The lifting component 13 is located on the lower side of the support platform 7, while the print head 3, radiation source 9, print carriage 4 and other components are located on the upper side of the support platform 7.

[0210] Specifically, the support platform 7 can be a polygon, a circle, or other regular or irregular shape, such as a square, like a rectangle or a square.

[0211] In another embodiment, the structure of the above-mentioned three-dimensional printing apparatus for colored objects is as follows: Figure 10 As shown, with Figure 9 The difference between the printing devices in the two systems is that... Figure 10 In the printing apparatus, the support platform 7 is a rotating platform, which is, for example, circular. During the printing process, the support platform 7 rotates clockwise or counterclockwise along its circumference (e.g., ...). Figure 10 The carriage 4 rotates around the support platform 7 in the direction of the arrow. It generally rotates at a constant speed. The carriage 4 drives the print head 3 to move at a constant speed in the radial direction parallel to the support platform 7 and sprays material 6. The leveling component 11 levels the material 6 sprayed onto the support platform 7, thereby facilitating the formation of a uniform material layer on the support platform 7.

[0212] In addition, the aforementioned 3D printing devices (such as...) Figure 9 or Figure 10The device shown also includes a controller 12 and a computer 14. The controller 12 may be located outside the chamber, or partially outside the chamber, but is not limited thereto; the computer 14 may be located outside the chamber, but is not limited thereto. Components such as the feeding unit, radiation source 9, and lifting component 13 are connected to the controller 12. The controller 12 controls each component to perform corresponding operations. For example, it controls the print head 3 to spray material 6 onto the support platform 7 to form a material layer based on layer printing data; it controls the leveling component 11 to level the material layer; it controls the radiation source 9 to provide radiation to the material layer to solidify the material layer and form the layer of the object to be printed; it controls the support platform 7 to rotate uniformly along its circumference; after the layer of the three-dimensional object is formed, it controls the support platform 7 to move relative to the print head 3 in a first direction. For example, it controls the lifting component 13 to move the support platform 7 in the height direction to change the relative distance between the support platform 7 and the print head 3, or it controls the print head 3 to move upward relative to the support platform 7 in the Z direction to change the relative distance between the support platform 7 and the print head 3, etc.

[0213] Computer 14 communicates with controller 12. Computer 14 acquires a three-dimensional digital model of the object to be printed, performs slicing and layering processing on the three-dimensional digital model to obtain multiple slice layer images, performs image processing on the slice layer images to obtain layer printing data, and sends the layer printing data to controller 12. Controller 12 controls each component to perform printing operations according to the layer printing data to form the object to be printed. As a specific embodiment, computer 14 can be a desktop computer, laptop computer, handheld computer, microcomputer, or cloud server, etc.

[0214] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 11 As shown, the electronic device 110 includes at least one processor 111, a memory 112, and a communication interface 113. The memory 112 and the communication interface 113 are connected to the processor 111 via a system bus and communicate with each other. The memory 112 stores instructions, and the communication interface 113 communicates with other devices. The processor 111 calls the instructions in the memory to execute the method steps provided in the above embodiments. The specific implementation and technical effects are similar and will not be described again here.

[0215] The system bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This system bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used to represent it in the diagram, but this does not mean that there is only one bus or one type of bus.

[0216] Communication interface 113 is used to enable communication between the database access device and other devices (such as clients, read-write databases, and read-only databases).

[0217] The memory 112 may include random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device.

[0218] Processor 111 can be a general-purpose processor, including a central processing unit, a network processor (NP), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0219] This application also provides a computer-readable storage medium storing computer-executable instructions. When executed by a processor, the computer-executable instructions are used to implement the method steps as described in the above method embodiments. The specific implementation methods and technical effects are similar and will not be repeated here.

[0220] This application also provides a program product comprising computer-executable instructions. When the computer-executable instructions are executed, they implement the method steps as described in the above method embodiments. The specific implementation and technical effects are similar and will not be repeated here.

[0221] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0222] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for 3D printing of a colored object, characterized in that, include: Obtain a 3D digital model of the object to be printed in color; The three-dimensional digital model is sliced ​​and layered to obtain multi-layer slice images. Each slice image includes a texture area, an internal filling area, and an isolation area. The isolation area is located between the texture area and the internal filling area. The sliced ​​layer image is processed to obtain the layer printing data corresponding to the sliced ​​layer image; Based on the layer printing data, the slice layer corresponding to the slice layer image is printed to obtain the layer of the colored object to be printed, wherein the texture area is printed using at least one colored material; The isolation area is printed using a predetermined ratio of white material and target material; the internal filling area is printed using at least one of colored material and white material, combined with the target material; the rigidity of the target material is greater than the rigidity of the colored material, and the toughness of the target material is less than the toughness of the colored material; the colored material, the white material, and the target material are UV-curable materials and / or thermosetting materials. The three-dimensional color object is obtained by layering the layers of the color object to be printed.

2. The method for three-dimensional printing of colored objects according to claim 1, characterized in that, The thickness of the textured area is set to 0.2 mm to 1.5 mm, and / or the thickness of the isolation area is set to 0.1 mm to 1 mm.

3. The method for three-dimensional printing of a colored object according to claim 1 or 2, characterized in that, The isolation area is printed using a predetermined ratio of white material and target material, including: The isolation area is printed using a white material, or the isolation area is printed using a combination of a white material and a target material, wherein the proportion of the white material is greater than the proportion of the target material; the rigidity of the target material is greater than the rigidity of the white material, and the toughness of the target material is less than the toughness of the white material.

4. The method for three-dimensional printing of a colored object according to claim 1 or 2, characterized in that, The rigidity is measured by bending strength and bending modulus, and the target material satisfies a first condition, which includes: bending strength greater than 70 MPa and bending modulus greater than 2000 MPa. Both the colored material and the white material meet the second condition, which includes: a flexural strength of 25 MPa to 30 MPa and a flexural modulus of 500 MPa to 1000 MPa.

5. The method for three-dimensional printing of a colored object according to claim 1 or 2, characterized in that, The toughness is measured by notched impact strength; the notched impact strength of the target material is 15 J / m to 25 J / m. The notched impact strength of the colored material and the white material is greater than 50 J / m.

6. The method for three-dimensional printing of a colored object according to claim 5, characterized in that, The heat distortion temperature of the target material is 55°C to 90°C, and the heat distortion temperature of the colored material and the white material is 30°C to 45°C.

7. The method for three-dimensional printing of a colored object according to claim 1 or 2, characterized in that, The target material is used to print the structural frame in the internal filling area, and the colored material and / or white material fills the area around the structural frame, wherein the structural frame includes at least one of a grid structure, a columnar structure, a bent structure, and a spiral structure.

8. The method for three-dimensional printing of a colored object according to claim 1 or 2, characterized in that, The target material is a transparent material.

9. The method for three-dimensional printing of a colored object according to claim 1 or 2, characterized in that, The process of slicing and layering the three-dimensional digital model to obtain multi-layer slice images includes: The three-dimensional digital model is sliced ​​and layered to obtain multiple slice layers and their corresponding slice layer outlines. A first contour is generated by extending the slice layer contour inwards from the slice layer contour, and the area between the slice layer contour and the first contour is the texture area. A second contour is generated by extending the first contour into the slice layer, and the area between the first contour and the second contour is an isolation area. The area within the outline of the slice layer, excluding the texture area and the isolation area, is defined as the internal filling area. The slice layer contour, the first contour, and the second contour are mapped to an image according to a preset resolution to obtain a slice layer image of the corresponding slice layer.

10. The method for three-dimensional printing of a colored object according to claim 1 or 2, characterized in that, The process of slicing and layering the three-dimensional digital model to obtain multi-layer slice images includes: The three-dimensional digital model is sliced ​​and layered to obtain multiple initial slice layer images and slice layer contours corresponding to the multiple initial slice layer images. A first contour is generated by extending the slice layer contour inwards from the slice layer contour, and the area between the slice layer contour and the first contour is the texture area. A second contour is generated by extending the first contour into the slice layer, and the area between the first contour and the second contour is an isolation area. The area within the outline of the slice layer, excluding the texture area and the isolation area, is defined as the internal fill area; the initial slice layer image, including the texture area, the isolation area, and the internal fill area, is defined as the slice layer image.

11. A colored object, characterized in that, include: The texture area, the inner fill area, and the isolation area are located between the texture area and the inner fill area. The texture area is printed using at least one colored material; The isolation area is printed using a predetermined ratio of white material and target material; the internal filling area is printed using at least one of colored material and white material, combined with the target material; the rigidity of the target material is greater than that of the colored material, and the toughness of the target material is less than that of the colored material; the colored material, the white material, and the target material are UV-curable materials and / or thermosetting materials.

12. The colored object according to claim 11, characterized in that, The thickness of the textured area is set to 0.2 mm to 1.5 mm, and / or the thickness of the isolation area is set to 0.1 mm to 1 mm.

13. The colored object according to claim 11 or 12, characterized in that, The isolation area is printed using a predetermined ratio of white material and target material, including: The isolation area is printed using a white material, or the isolation area is printed using a combination of a white material and a target material, wherein the proportion of the white material is greater than the proportion of the target material; the rigidity of the target material is greater than the rigidity of the white material, and the toughness of the target material is less than the toughness of the white material.

14. The colored object according to claim 11 or 12, characterized in that, The rigidity is measured by bending strength and bending modulus, and the target material satisfies a first condition, which includes: bending strength greater than 70 MPa and bending modulus greater than 2000 MPa. Both the colored material and the white material meet the second condition, which includes: a flexural strength of 25 MPa to 30 MPa and a flexural modulus of 500 MPa to 1000 MPa.

15. The colored object according to claim 11 or 12, characterized in that, The toughness is measured by notched impact strength; the notched impact strength of the target material is 15 J / m to 25 J / m. The notched impact strength of the colored material and the white material is greater than 50 J / m.

16. The colored object according to claim 15, characterized in that, The heat distortion temperature of the target material is 55°C to 90°C, and the heat distortion temperature of the colored material and the white material is 30°C to 45°C.

17. The colored object according to claim 11 or 12, characterized in that, The target material is used to print the structural frame in the internal filling area, and the colored material and / or white material fills the area around the structural frame, wherein the structural frame includes at least one of a grid structure, a columnar structure, a bent structure, and a spiral structure.

18. The colored object according to claim 11 or 12, characterized in that, The target material is a transparent material.

19. A three-dimensional printing device for colored objects, characterized in that, include: The acquisition module is used to acquire the three-dimensional digital model of the color object to be printed; The slicing and layering module is used to perform slicing and layering processing on the three-dimensional digital model to obtain multi-layer slice images. The slice image includes a texture area, an internal filling area, and an isolation area. The isolation area is located between the texture area and the internal filling area. The image processing module is used to perform image processing on the slice layer image to obtain the layer printing data corresponding to the slice layer image; A printing module is used to print the slice layer corresponding to the slice layer image based on the layer printing data to obtain the layer of the colored object to be printed, wherein the texture area is printed using at least one colored material; The isolation area is printed using a predetermined ratio of white material and target material; the internal filling area is printed using at least one of colored material and white material, combined with the target material; the rigidity of the target material is greater than the rigidity of the colored material, and the toughness of the target material is less than the toughness of the colored material; and, the layers of the colored object to be printed are stacked one by one to obtain a three-dimensional colored object, wherein the colored material, the white material and the target material are UV-curable materials and / or thermosetting materials.

20. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes the computer execution instructions to implement the method as described in any one of claims 1 to 10.

21. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed, are used to implement the method as described in any one of claims 1 to 10.

22. A computer program product, characterized in that, Includes a computer program, which, when executed, implements the method of any one of claims 1 to 10.

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