A 3D printing method, a 3D printing device, and a storage medium

Abstract

This invention discloses a 3D printing method, 3D printing equipment, and storage medium. It primarily involves printing a color layer first, followed by curing a molding medium on the color layer, so that the color layer and the molding medium together form the printed layer, achieving one-time printing of a colored model without the need for additional coloring. The main technical solution of this invention is a 3D printing method, comprising: setting a color layer on a structural surface, the color layer matching the color required for the current printing layer of the model to be printed; adding a molding medium to the structural surface, the molding medium covering the color layer; controlling a molding platform to move closer to the structural surface, so that the distance between the molding platform and the structural surface is equal to the preset printing height corresponding to the current printing layer; and curing the molding medium on the molding platform according to the edge shape information of the current printing layer to form the current printing layer. This invention is mainly used for printing models.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, and in particular to a three-dimensional printing method, a three-dimensional printing device, and a storage medium. Background Technology

[0002] In a photopolymer 3D printer, a resin tank is placed above a light source, and the printing platform is immersed in the resin. The light source provides light along a preset contour based on the slice data of the model to be formed, causing the resin in the tank to solidify and adhere to the printing platform according to the preset contour. After solidification, the printing platform moves upward, causing the model to detach from the release film. The above steps can then be repeated to build up layers and achieve a three-dimensional shape.

[0003] After the model is formed, it is a single color. If color printing is required, it can be achieved by changing the color of the resin in the material tank. However, the color can only be changed in the height direction of printing. In the existing technology, after printing, the model is painted with an additional spray painting device to make the model present color. However, printing and painting are two separate steps, which are cumbersome, take a long time to print the finished product, and require a lot of equipment and space. Summary of the Invention

[0004] In view of the above, in order to solve at least one of the above technical problems, the present invention provides a three-dimensional printing method, a three-dimensional printing device, and a storage medium.

[0005] To achieve the above objectives, the present invention mainly provides the following technical solutions:

[0006] On one hand, the present invention provides a three-dimensional printing method applied to a three-dimensional printing device to print a model to be formed. The three-dimensional printing device includes a construction surface and a forming platform. The three-dimensional printing method includes:

[0007] A color layer is set on the construction surface, and the color layer matches the color required for this printing layer of the model to be formed;

[0008] Add molding medium to the structure surface. The molding medium covers the color layer. The area covered by the molding medium on the structure surface corresponds to the layer to be printed.

[0009] Control the molding platform to move closer to the structural surface so that the distance between the molding platform and the structural surface is equal to the preset printing height corresponding to this printing layer;

[0010] Based on the edge shape information of this printing layer, the molding medium is cured on the molding platform to form this printing layer.

[0011] On the other hand, the present invention also provides a three-dimensional printing device, comprising:

[0012] Memory, used to store computer programs;

[0013] A processor is used to execute computer programs to implement the steps of any of the aforementioned 3D printing methods.

[0014] In another aspect, the present invention also provides a computer-readable storage medium storing at least one executable instruction that causes a processor to perform the steps of the three-dimensional printing method as described in any of the preceding claims.

[0015] This invention proposes a 3D printing method, 3D printing equipment, and storage medium. The method primarily involves first setting a color layer on the structural surface, then curing a molding medium on the color layer. This allows the color layer and molding medium to jointly form the printing layer on the molding platform, creating a colored model through stacking. This achieves one-time molding of the colored model without the need for additional coloring and offers flexible color options. In existing technologies, color printing can be achieved by changing the resin color in the printing tank, but this only allows for color changes along the printing height. Existing technologies also involve applying additional spray painting to the model after printing, but printing and painting are two separate steps, which are cumbersome, time-consuming, require multiple pieces of equipment, and occupy a large space. Compared to existing technologies, this application involves forming a colored layer on the structural surface before printing the printing layer. A molding medium is then cured on the colored layer, resulting in the molding medium and colored layer being laminated and cured to form the current printing layer. Each printing layer is printed sequentially, with the colored layer sandwiched between resin layers. The model displays color through the resin layer, achieving one-time molding of the colored model. Furthermore, color control during the spraying of the colored layers allows for multiple colors in a single layer, enabling flexible color changes as needed. In addition, forming the colored layer on the structural surface first, rather than directly printing the paint onto the current printing layer, allows for more precise color application. Adding the molding medium to the structural surface ensures direct contact and curing of the colored layer with the molding medium, resulting in better adhesion between the two layers. When the molding platform is raised and lowered, the individual thickness of the colored layer or the molding medium does not need to be considered; both can be treated as a single model layer. The curing position of both is highly accurate, the color printing method is simple, and it has high adaptability. Attached Figure Description

[0016] Figure 1 A flowchart of a three-dimensional printing method provided in an embodiment of the present invention;

[0017] Figure 2 A flowchart of another 3D printing method provided in an embodiment of the present invention;

[0018] Figure 3 A flowchart of another 3D printing method provided in an embodiment of the present invention. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description of the specific implementation, structure, features and effects of the three-dimensional printing method proposed according to the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0020] This invention provides a 3D printing method for use in a 3D printing device to print a model to be formed. The 3D printing device includes a structural surface and a forming platform. The structural surface is used for release, that is, after the forming medium layer or color layer has cured, the structural surface separates from the forming medium layer or color layer. The structural surface is used to generate light or to transmit light, so that the forming medium and color layer above the structural surface can reflect and cure, forming the printed layer. The structural surface can be implemented in various ways. For example, the structural surface can be the screen of the 3D printing device, which directly contacts the forming medium or color layer and directly participates in the release. Alternatively, the 3D printing device also includes a medium tank, which includes a receiving cavity and a release film. The release film at least partially constitutes the inner wall of the receiving cavity, and the release film includes the structural surface, such as the surface of the highest region of the release film. Alternatively, the medium tank can be entirely transparent, and the area of ​​the medium tank relative to the light source and used for forming is the structural surface. For ease of description, in the following text, the example will be a medium tank including a release film, with the forming platform opposite to the release film of the medium tank, and the release film being the structural surface.

[0021] In some embodiments, the 3D printing equipment further includes a coating assembly, a packing assembly, a media tank, and a curing assembly, with the packing assembly communicating with the receiving cavity. Furthermore, the 3D printing equipment may also include a support frame, a horizontal power mechanism, and a Z-axis power mechanism. The support frame has a light-emitting opening covered by a screen, and the media tank is placed on the support frame with the release film opposite to the screen. The horizontal power mechanism is connected to the support frame, and the coating assembly is connected to the horizontal power mechanism, which drives the coating assembly to move in a plane parallel to the release film. The Z-axis power mechanism is connected to the support frame, and the forming platform is connected to the Z-axis power mechanism, which drives the forming platform to move closer to or away from the release film.

[0022] The controller of the 3D printing equipment is used to execute the 3D printing method. The horizontal power mechanism, Z-axis power mechanism, coating assembly, and lamination assembly are all electrically connected to the controller. The controller includes a control chip. In one embodiment, such as... Figure 1 As shown, 3D printing methods include:

[0023] S1-1. Set a color layer on the construction surface. The color layer should match the color required for the current printing layer of the model to be formed.

[0024] The color layer can be in a liquid state or a solid-liquid mixture, and it is attached to the release film. The color layer on the structural surface, i.e., on the release film, can be applied solely to the release film, such as by liquid coating without further processing, such as without light, such as without UV (ultraviolet) irradiation; alternatively, the color layer can be applied while simultaneously being irradiated with UV light; or the color layer can be applied first, followed by UV irradiation.

[0025] Specifically, 3D printing equipment also includes coating and curing components, and the color layer can be achieved in the following ways:

[0026] Based on the color information of this printing layer, a color layer is applied to the structural surface.

[0027] Specifically, the color layer is applied by spraying paint onto the structural surface using a coating component, based on the color information of the printed layer. The paint can be cured under light of a set color or wavelength, such as ultraviolet or violet light. The paint can be stored in an automatically fed container, such as a negative pressure container. The paint includes various colors, such as black, white, red, yellow, and blue; or white, cyan, magenta, yellow, and black. Existing colors can be applied as needed, and different colors can be mixed to create desired colors, such as orange or pink. Color mixing can be performed within a mixing space inside the coating component, or before the paint enters the coating component. Alternatively, two paints to be mixed can be sprayed sequentially onto the release film and mixed on the release film; this application does not impose any limitations. The coating component includes multiple controllable opening and closing nozzles, which are opposite to the release film. The coating component can be moved relative to the release film by controlling a horizontal power mechanism, and the nozzles at corresponding positions can be opened to spray paint at the corresponding locations. The paint will be dripped onto the release film to form a color layer on the release film that matches the color required for this printing layer.

[0028] Specifically, the color information of this printed layer includes at least one sub-coating area, and all sub-coating areas constitute the coated area. The coated area refers to the entire area covered by the paint after the coating process is completed. The coated area should be located below the formed layer during the printing process, meaning it should be completely covered by the forming medium layer. The color corresponding to this printed layer can be a single color, such as a single blue, in which case the coated area can be filled with blue paint. Alternatively, in some embodiments, the color corresponding to this printed layer may be multiple colors divided into regions, such as half a region being blue and the other half being green. The blue region corresponds to one sub-coating area, and the green region corresponds to another sub-coating area, requiring the application of different colors of paint to the two sub-coating areas during the coating process.

[0029] Specifically, the color information of this printed layer also includes the color information corresponding to the sub-coating area. Based on the color information of this printed layer, the step of controlling the coating component to apply the coating to the release film of the medium tank includes: according to the color information of the sub-coating area and the sub-coating area, controlling the coating component to apply the coating to the structural surface.

[0030] When the color corresponding to the current printing layer is a single color, the sub-coating area is a single area, and the color information corresponding to the sub-coating area is the single color corresponding to the current printing layer, such as the blue in the example above. When the color corresponding to the current printing layer is multiple colors divided into areas, the number of sub-coating areas is multiple, such as the two sub-coating areas in the example above. The color information corresponding to each sub-coating area is the color that needs to be presented in different areas of the current printing layer, such as the color information corresponding to the two sub-coating areas being blue and green respectively. During the coating process, the coating component is moved by controlling the horizontal power mechanism, and the openable and closable spray groups on the coating component are controlled to coat the paint in different areas. For example, the blue paint is coated on one sub-coating area first, and then the green paint is coated on the other sub-coating area. Alternatively, the openable and closable spray groups on the coating component can also be controlled to coat two sub-coating areas with different colors of paint simultaneously.

[0031] The coating layer is designed to extend at least to the edge of the printed layer so that the outer surface of the finished model can display color, while the central area, far from the edge, will remain uncoated due to being covered by multiple layers. Therefore, the following methods can be used for color layer application:

[0032] First, the edge shape of the coating area is consistent with the edge shape of the printed layer, or in other words, the outline of the coating area is consistent with the outline of the light spot when the curing component cures the printed layer, so that after molding, the coating can completely cover the bottom surface of the printed layer, which will be explained in more detail below.

[0033] Secondly, the edge shape of the sub-coated area matches the edge shape of the current printed layer. This includes two specific implementation methods. In one implementation, only a portion of the current printed layer needs to be colored, such as the left half being colored while the right half is transparent. In this case, the sub-coated area only needs to have a portion of its edge shape matching the edge shape of the area to be colored in the current printed layer. In another implementation, the paint does not need to cover the entire bottom surface of the current printed layer; it only needs to extend to the edge. For example, the coated area matches the edge shape of the current printed layer and is a pre-defined width. After the current printed layer is formed, the coated area extends to the edge of the current printed layer and is a region at a pre-defined width from the edge. This can be a ring-shaped region at a pre-defined width, such as 1 mm, 3 mm, or 8 mm. This allows the color of the color layer to be reflected at the edge of the current printed layer, while the center is not reflected but is covered by the next printed layer. This reduces the coating time and paint usage without affecting the model's color rendering effect. In another embodiment, when the color corresponding to the current printing layer is multiple colors in different regions, each sub-coating region corresponds to a part of the bottom surface of the current printing layer. The edge shape of the sub-coating region located at the edge of the current printing layer is consistent with the edge shape of the current printing layer, while the edge shape of the sub-coating region located at the non-edge of the bottom surface of the current printing layer can match the edge shape of the adjacent sub-coating region to connect with each other.

[0034] In some implementations, the model to be formed needs to be printed simultaneously with the support. For example, if the model has areas with abrupt changes in direction, the support needs to be printed simultaneously between the abrupt change area and the forming platform to ensure that the abrupt change area has a solidified support point. The color information of this printed layer refers to the color information of the model to be formed itself and the support, and the edge shape of this printed layer refers to the overall edge shape of the model to be formed and the support. It can be understood that the color layer may not be applied to the area corresponding to the support; that is, the color layer only covers the area on the bottom surface of this printed layer corresponding to the model to be formed itself.

[0035] S1-2. Add molding medium to the structure surface. The molding medium covers the color layer. The area covered by the molding medium on the structure surface corresponds to the printing layer.

[0036] The molding medium can cover only a portion of the structural surface or cover the entire structural surface. The coverage area of ​​the molding medium should be at least larger than the area corresponding to the current printing layer to ensure that the current printing layer can be fully formed, thus reducing the amount of molding medium added. In the implementation method described above that requires printing the model and support simultaneously, the coverage area of ​​the molding medium on the structural surface corresponding to the current printing layer of the model to be formed means that it corresponds at least simultaneously to the model to be formed itself and its corresponding support. If the model to be formed has no support, then it does not need to correspond to the support.

[0037] The filling and discharging assembly can fill or discharge the molding medium into the receiving cavity in various ways. For example, it can use a conduit, a peristaltic pump, and a container. The two ends of the conduit are connected to the receiving cavity and the inner cavity of the container, respectively. The peristaltic pump is connected to the conduit, and the flow of the molding medium between the container and the medium tank is achieved by the forward and reverse rotation of the peristaltic pump. Alternatively, the feeding and discharging mechanism can be similar to the coating method, using a controllable nozzle. The controllable nozzle is moved by a horizontal power mechanism to coat the molding medium. Using the coating method, on the one hand, it is possible to add the molding medium only locally on the structural surface, thereby reducing the amount of molding medium used; on the other hand, by coating, the molding medium drips onto the color layer, preventing significant positional movement relative to the color layer, and avoiding the flow of the molding medium relative to the color layer that occurs when adding molding medium through a high-flow-rate feed pipe. This prevents uncured or incompletely cured color layers from being washed away and mixed into the molding medium, thus ensuring coloring accuracy.

[0038] When the molding medium is exposed to light of a specific color or frequency, its state changes from liquid to solid, such as when the molding medium is resin. To allow the color of the coating to pass through the medium layer, the medium layer of this printing layer is a light-transmitting layer, meaning the molding medium is a light-transmitting molding medium, specifically, a transparent molding medium. The height to which the molding medium is added should be greater than the thickness of this printing layer, but not too high, thus ensuring efficient material addition and submersion. For example, the adding and submersion components add molding medium to the structural surface, with the thickness of the molding medium being greater than or equal to the thickness of this printing layer. That is, the distance from the liquid surface of the molding medium to the release film is greater than the thickness of this printing layer. Alternatively, the distance from the liquid surface of the molding medium to the release film can be less than twice the thickness of this printing layer. Optionally, the distance from the liquid surface of the molding medium to the release film can be less than or equal to 3mm. More specifically, the adding and submersion components add a preset amount of molding medium to the structural surface, set according to the capacity of the medium tank, such as calculating the preset amount based on the length and width of the receiving cavity and the required height of the molding medium liquid surface, thus ensuring that the added molding medium reaches the preset height.

[0039] Alternatively, the 3D printing equipment may also include a liquid level sensor. This sensor can be a non-contact sensor, such as an infrared probe, or a contact sensor, such as a probe. The liquid level sensor is positioned opposite the receiving cavity. The control assembly continuously adds molding medium to the surface, receives the liquid level sensing signal from the sensor, determines the relationship between the liquid level and the preset liquid level, and stops adding molding medium when the preset level is reached. This achieves quantitative addition of the molding medium.

[0040] Alternatively, the 3D printing equipment may also include a weighing device connected to the media tank. The weighing device can also be connected to a support structure or an additional support structure. The weighing device can be a combination of a deformable component and a deformation sensor. The control assembly continuously adds molding media to the surface, receives the weight value sent by the weighing device, determines the relationship between the weight value and a preset weight, and when the weight value reaches the preset weight, controls the addition assembly to stop adding molding media into the media tank's cavity, thus achieving quantitative addition of molding media.

[0041] Alternatively, the feeding and discharging components can be controlled to add molding medium to the structural surface at a preset flow rate for a preset time. For example, the required feeding time can be calculated based on the infeed and outfeed flow rates and the amount of molding medium to be added to the receiving cavity, and then feeding can be performed at a certain flow rate within the feeding time to control the feeding amount.

[0042] S1-3. Control the molding platform to move closer to the structural surface so that the distance between the molding platform and the structural surface is equal to the preset printing height of the model to be molded.

[0043] The molding platform is controlled to move closer to the release film until the bottom surface of the molding platform or the bottom surface of the completed model is immersed in the molding medium, or the bottom surface of the molding platform or the bottom surface of the completed model contacts the liquid surface of the molding medium. It then moves to a preset printing height corresponding to the current printing layer, which is the distance required to print this layer. For example, the preset printing height is the sum of the thickness of this printing layer and the thickness of the completed model. When no model is connected to the molding platform, i.e., this printing layer is the first layer of the model, the preset printing height is the thickness of this printing layer. In embodiments where a completed model is already connected to the molding platform, such as starting color model printing from the middle, the preset printing height is the sum of the thickness of the completed model connected to the molding platform and the thickness of this printing layer, thus obtaining the thickness of this printing layer between the completed model and the release film. It can be understood that if there is no completed model, the thickness of the completed model is 0. It can also be understood that even for the same model, the thickness of different printing layers may be different.

[0044] S1-4. Based on the edge shape information of this printing layer, solidify the molding medium on the molding platform to form this printing layer.

[0045] The curing component is located on the side of the release film opposite to the molding platform, such as at the bottom of the release film, with light shining upwards onto it. Based on the edge shape information of the printed layer, the control unit illuminates the molding medium within the receiving cavity according to the edge shape of the printed layer, so as to form the printed layer of the model to be molded on the surface of the molding platform, or on the completed model of the model to be molded on the molding platform. The curing component can emit only uniform collimated light, and the screen can be a gated screen, allowing the light to pass through the edge shape of the printed layer and through the release film to cure the printed layer. Alternatively, the curing component can directly emit light according to the edge shape of the printed layer, such as if the curing component is an OLED screen.

[0046] It's worth noting that the presence of the color layer slightly reduces the thickness of the resin area in this printing layer. However, when curing the color layer and molding medium, the thickness of a single layer of the color layer or molding medium is not determined. Instead, both are treated as a whole, making them the thickness of this printing layer, thus avoiding the influence of the color layer on the model's height. Since the paint applied to the release film is liquid, to prevent unstable paint position, self-flow, overflow, color mixing, or movement when adding the molding medium, the paint can be cured after or during the application process.

[0047] The 3D printing method further includes, after solidifying the molding medium on the molding platform according to the edge shape information of the printing layer of the model to be formed, to create the printing layer of the model to be formed:

[0048] The process involves controlling the molding platform to move to a preset release height to detach the current printed layer from the structural surface, and controlling the adding and discharging components to expel the molding medium from the structural surface. This process is repeated, using the next layer as the current printed layer, adding a color layer to the structural surface (matching the color required for the current printed layer of the model), adding molding medium to the structural surface (covering the color layer), and ensuring the area covered by the molding medium corresponds to the current printed layer. The molding platform is then moved closer to the structural surface until the distance between the molding platform and the structural surface equals the preset printing height corresponding to the current printed layer of the model. Based on the edge shape information of the current printed layer, the molding medium is cured on the molding platform to form the current printed layer of the model. The molding platform is then moved to the preset release height to detach the current printed layer from the structural surface, and the adding and discharging components to expel the molding medium from the structural surface. This process continues until the printing of the model is complete.

[0049] The above steps of this application can be repeated until the model to be printed is completed.

[0050] Specifically, this means that the printed layer is separated from the structure surface, which means that the printed layer formed together with the color layer and the molding medium layer is separated from the structure surface.

[0051] This invention proposes a 3D printing method, 3D printing equipment, and storage medium. The method primarily involves first setting a color layer on a structural surface, then curing a molding medium on the color layer. This allows the color layer and molding medium to jointly form the printing layer on a molding platform, creating a colored model through stacking. This achieves one-time molding of the colored model without the need for additional coloring and offers flexible color options. In existing technologies, color printing can be achieved by changing the resin color in the printing tank, but this only allows for color changes along the printing height. Existing technologies also involve applying additional spray painting to the model after printing, but printing and painting are two separate steps, which are cumbersome, time-consuming, require multiple pieces of equipment, and occupy a large space. Compared with the prior art, in this application, a colored layer is first formed on the structural surface before printing the printing layer. Then, the molding medium is cured on the colored layer, so that the molding medium and the colored layer are stacked and cured to form the current printing layer. Each printing layer is printed in sequence. The colored layer is sandwiched between the resin layer, and the model presents color through the resin layer, realizing the one-time molding of the colored model. Moreover, by controlling the color when spraying the colored layer, a single colored layer can have multiple colors, so that the color can be flexibly changed as needed.

[0052] like Figure 2 As shown, this application also provides another 3D printing method, including:

[0053] S2-1. Based on the color information of this printing layer, apply a color layer to the structural surface.

[0054] S2-2, Control the curing component to cure the color layer on the surface of the contact structure and at most a portion of the surface of the curing color layer on the opposite structure.

[0055] The coating is in a liquid state. After being sprayed from the coating assembly, it remains liquid when it drips onto the release film. To prevent the coating from shifting, a curing assembly is used to cure the coating after application. Depending on the coating, the curing assembly can utilize various light sources. For example, if the coating is photosensitive, the curing assembly can include a curing lamp that emits light to cure the coating. Alternatively, the coating can be temperature-sensitive, curing naturally or through heat dissipation. Furthermore, the coating can be infrared or ultraviolet-sensitive curing, cured using infrared or ultraviolet lamps.

[0056] More specifically, in embodiments where the coating is a photosensitive coating, the liquid coating possesses oxygen-inhibiting polymerization properties. It can cure under light when not in contact with oxygen, but is difficult to cure or only partially cures when in contact with oxygen. For the coating applied to the release film, the side of the coating in contact with the structural surface is not in contact with air, i.e., it is in an oxygen-free environment, and can cure under certain curing conditions, enabling the curing component to cure the surface of the color layer in contact with the structural surface. The surface of the color layer opposite to the structural surface, i.e., the upper surface, is in contact with air, so only part of the upper surface is cured or the entire upper surface remains uncured, remaining in a liquid or semi-liquid state. This means the curing component can cure at most a portion of the surface of the color layer opposite to the structural surface. When applying or adding molding media to the coating, because the color layer is fixed on the release film, there will be no overflow or displacement of multiple colors, ensuring the accuracy of color application. Meanwhile, the upper surface of the opposite structural surface of the color layer is in a liquid or semi-liquid state, allowing the color layer to fuse with the molding medium. After contact with the molding medium, the upper surface of the opposite structural surface of the color layer becomes an oxygen-free environment, providing conditions for curing again, enabling the color layer and the molding medium to cure together. This ensures coloring accuracy and better adhesion between the color layer and the medium layer of the same printing layer.

[0057] The printing process for this layer requires two photocuring processes. The first is the curing of the color layer, and the second is the curing of the molding medium and color layer together in subsequent steps to form the printed layer. The curing assembly can be configured in the following two ways:

[0058] The same light source can be used for both curing processes. In one embodiment, the curing component includes a single light source, which can be a UV lamp. The light source is located on one side of the molding platform opposite to the release film. The light emitted by the light source passes through the screen and the release film and is used to irradiate the color layer and the molding medium to form the printed layer.

[0059] The two curing processes can also use different, completely independent light sources. In one embodiment, the curing assembly includes a first light source and a second light source. The first light source is positioned on the side of the release film closer to the molding platform, and the second light source is positioned on the side of the release film farther from the molding platform. The step of controlling the curing assembly to cure the color layer specifically involves controlling the first light source to cure the color layer. The subsequent printing layer is then achieved by irradiating the molding medium and the color layer with the second light source. The first light source can be a UV lamp.

[0060] To ensure complete curing of the color layer, the projection area of ​​light onto the release film must be at least larger than the coating area of ​​the color layer. In one embodiment, the curing unit is controlled to irradiate the color layer with an area that at least covers the color layer, or with a light spot covering an area larger than the color layer, such that the projection area onto the release film exceeds the coating area of ​​the color layer, thereby ensuring complete curing of the color layer on the side opposite the release film.

[0061] Alternatively, in another implementation, the curing component can be controlled to illuminate the color layer according to the edge shape of the printed layer, that is, the light source can be controlled to illuminate the color layer according to the light of the printed layer being cured. In other words, the light of the cured color layer and the printed layer are consistent. For example, in the implementation of light transmission through a gating screen, the content displayed on the gating screen is consistent in the two curing processes, thereby reducing the control burden and simplifying the control process.

[0062] Alternatively, in some other implementations, the curing component can be controlled to irradiate the color layer according to the edge shape of the color layer. For example, in the implementation above where the coating area only covers part of the current printing layer, only the area where the color layer is located can be irradiated. If the color layer is an annular color layer extending to the edge of the current printing layer, only the annular light projection corresponding to the coating area can be generated. Energy saving is achieved by reducing the amount of light projection, as well as reducing the heating of the molding medium and screen caused by light projection.

[0063] Curing of the color layer can be performed after coating is completed or during coating. If the curing component includes a single light source, it can continuously irradiate during coating, followed by the first curing of the coating during the coating process, or it can be irradiated uniformly after coating is completed. When the curing component includes a first light source and a second light source, the color layer can be moved and cured during the coating process. For example, the first light source can be connected to the coating component and driven by a horizontal power mechanism to achieve moving irradiation of the color layer. The light source can be a line light source, scanning the entire coating area by movement, thereby reducing the operating cost of the first light source and avoiding the heat generated by irradiating the screen and release film from below. Moving curing can also be performed after coating is completed or continuously during coating. Simultaneous coating and curing ensure more timely curing and avoid the problems of paint mixing and overflow that easily occur when turning on the light source after coating. At the same time, moving curing reduces the size of the light projection area, avoiding light waste and increased temperature of the molding medium caused by projecting large areas of curing light. A one-time curing method after coating can save exposure time and avoid the heat generated by prolonged exposure.

[0064] S2-3. Add molding medium to the structure surface. The molding medium covers the color layer. The area covered by the molding medium on the structure surface corresponds to the printing layer.

[0065] S2-4. Control the molding platform to move closer to the structural surface so that the distance between the molding platform and the structural surface is equal to the preset printing height corresponding to this printing layer.

[0066] S2-5. Based on the edge shape information of this printing layer, solidify the molding medium on the molding platform to form this printing layer.

[0067] For a detailed description of steps S2-1, S2-3 to S2-5, please refer to the description of steps S1-1 to S1-4 in the foregoing embodiments, which will not be repeated here.

[0068] like Figure 3 As shown, this invention also provides another 3D printing method for a 3D printing device. The 3D printing device can be consistent with the aforementioned embodiments of the 3D printing device, and will not be described again here. The 3D printing method includes:

[0069] S3-1. Obtain the color information corresponding to the current printing layer.

[0070] Color information can be read from local files, external storage, or obtained through a cloud platform. Color information includes the coated area and the corresponding color information, which is the color of the printed layer within that area.

[0071] S3-2. Use one layer of the model to be printed as the printing layer.

[0072] This printing layer can be either the first layer or any middle layer of the model to be formed. For example, if this printing layer is the middle layer of the model to be formed, the color model printing can begin in the latter half of the model printing process. It should be noted that if this printing layer is the middle layer of the model to be formed, the forming medium in the medium tank must first be drained until the release film is exposed, and the squeegee must be controlled to push the forming medium. This will be described in detail later. If this printing layer is the first layer of the model to be formed, there is no need to drain the forming medium or perform the scraping process.

[0073] S3-3, Control the molding platform to move to the initial position.

[0074] Since the coating component has a certain height, it will occupy a certain space to move, and the moving position is above the release film, which conflicts with the position of the molding platform when it participates in the curing of the printing layer. In order to make way for the coating component, the initial position of the molding platform refers to the molding platform moving away from the release film, and then rising to a position higher than the top of the coating component, so as to make way for the coating coating when the coating component is moved.

[0075] S3-4. Based on the color information of this printing layer, apply a color layer to the structural surface.

[0076] S3-5. Control the curing component to cure the color layer on the surface of the contact structure and at most a portion of the surface of the curing color layer on the opposite structure.

[0077] S3-6. Add molding medium to the structure surface. The molding medium covers the color layer. The area covered by the molding medium on the structure surface corresponds to the printing layer.

[0078] S3-7. Control the molding platform to move closer to the structural surface so that the distance between the molding platform and the structural surface is equal to the preset printing height corresponding to this printing layer.

[0079] S3-8. Based on the edge shape information of this printing layer, solidify the molding medium on the molding platform to form this printing layer.

[0080] For details of processes S3-4 to S3-8, please refer to the description of S2-1 to S2-5 in the aforementioned embodiments. After the printed layer is formed, it is attached to the bottom surface of the forming platform or to the bottom surface of the formed model.

[0081] S3-9. Control the molding platform to move to the preset release height so that the printed layer is separated from the construction surface.

[0082] Under irradiation, the molding medium and color layer form the current printing layer. One side of this printing layer adheres to the molding platform or the completed model, while the other side attaches to the release film. The adhesion between this printing layer and the previous color layer or medium layer is much greater than the adhesion between the cured color layer or molding medium and the release film. As the molding platform moves upward, this printing layer detaches from the release film and participates in the printing of the next model layer.

[0083] After the current printing layer is completed, the next color layer can be applied. The moving height of the molding platform should ensure that the current printing layer is released, while also ensuring that the bottom of the completed model can make way for the coating component to move and apply the coating. More specifically, the preset release height is the sum of the coating clearance height and the thickness of the completed model connected to the molding platform. The coating clearance height is greater than the vertical distance from the top of the coating component to the release film, such as 2 mm, 3 mm, or 4 mm.

[0084] In some implementations, the next layer after the current printed layer may not be printed in color, but only in ordinary printing. In steps S3-9, controlling the forming platform to move to the preset release height may only be to ensure that the current printed layer is detached from the release film. After step S3-9, the forming platform is directly moved to a position where the thickness of one model layer separates the formed model from the release film. Then, it is irradiated according to the edge shape of the next model layer to form the next model layer, achieving printing with only a printed layer and no color layer. This printing can continue for multiple layers before color printing, simplifying the printing process. Furthermore, because the single-layer model is relatively thin, the colors will still be visible even when multiple printed layers are sandwiched between adjacent color layers.

[0085] If color printing is required again after printing one or more layers below the current print layer, continue with the following steps:

[0086] S3-10, Control the discharge of the forming medium from the structural surface by the discharge assembly.

[0087] In order to apply the coating for the next printing layer, the molding medium needs to be discharged to expose the release film, which then receives the coating.

[0088] As described in the previous embodiments, the feeding and discharging assembly can employ a conduit, a peristaltic pump, and a container. The peristaltic pump rotates in the opposite direction to the direction of rotation when adding the molding medium, causing the molding medium in the receiving cavity to flow back into the container cavity until the release film is exposed. The medium can be completely discharged from the receiving cavity, exposing the entire area above the release film. Alternatively, only the area to be molded in this printing layer can be discharged. For example, molding medium may remain at the edges of the release film, while the molding medium in the central area is discharged, allowing only the color layer to be sprayed in the central area. Specifically, the extraction time can be determined based on the amount of molding medium added and the flow rate when the molding medium is discharged. For example, the molding medium can be discharged at a preset flow rate and time within a preset time. The preset flow rate and preset time can be the same as or greater than the flow rate and time during feeding. Since part of the molding medium is solidified into the printing layer, the amount of molding medium to be extracted is less than the amount added. The preset flow rate and preset time can be the same as the flow rate and time during feeding, ensuring that the molding medium is completely extracted. Alternatively, where complete extraction of the molding medium is required, the extraction time can be increased to ensure complete extraction. Alternatively, in embodiments of the 3D printing equipment that include a liquid level sensor, such as a probe sensor, the probe can be positioned just before contacting the release film, and the presence of an electrical change in the probe indicates whether most of the disc-shaped molding medium has been extracted. Alternatively, a weighing device can be used to obtain the combined weight information of the medium tank and the molding medium, and whether the weight is the same as the weight of the medium tank alone can determine whether the molding medium has been completely extracted.

[0089] The steps S3-9, controlling the molding platform to move to the preset release height so that the printed layer detaches from the structural surface, and S3-10, controlling the addition and discharge components to discharge the molding medium from the structural surface, can be performed simultaneously. For example, the molding platform can be moved away from the release film while the molding medium in the receiving cavity is discharged. Alternatively, the molding medium in the receiving cavity can be discharged first, and then the molding platform can be moved away from the release film. Similarly, the steps S3-6, adding molding medium to the structural surface, and S3-7, controlling the molding platform to move closer to the structural surface so that the distance between the molding platform and the structural surface corresponds to the distance required for the printed layer of the model to be molded, can be performed simultaneously. For example, the molding platform can be moved towards the release film while the molding medium is added to the receiving cavity. Alternatively, the molding platform can be moved towards the release film first, and then the molding medium can be added to the receiving cavity.

[0090] S3-11, Control the material cleaning component to scrape off the forming medium above the structural surface.

[0091] The 3D printing equipment also includes a cleaning assembly, which mainly consists of a scraper and a tilting drive. The cleaning assembly can be connected to the coating assembly or the horizontal drive mechanism, or it can have a separate scraper drive mechanism to move the cleaning assembly. Taking the cleaning assembly and the horizontal drive mechanism as an example, the tilting drive is connected to the horizontal drive mechanism directly or through an additional support, and the scraper is connected to the tilting drive. For example, the tilting drive can be a motor, and the scraper is connected to the motor's output shaft. The scraper has a certain extension, such as extending in the width direction of the media tank, and the extension length is greater than the extension length of the release film in the width direction of the media tank. The horizontal drive mechanism drives the scraper to move in the length direction of the media tank, allowing the scraper to remove resin from the entire area above the release film. The remaining molding media on the release film after discharge is scraped and pushed to one side of the receiving cavity or into a storage device connected to the receiving cavity. The scraper has two states: working state and idle state. When the scraper switches from working state to idle state, the bottom of the scraper moves away from the structural surface. In other words, the bottom of the scraper is in contact with the structural surface when it is working, and moves away from the structural surface when it is idle.

[0092] During the coating process, the flipping power unit moves the scraper to a horizontal extension (idle state), raising the bottom of the scraper above the discharge port at the bottom of the coating component. This ensures that the scraper bottom does not contact the release film when the coating component moves above it. The distance between the bottom of the coating component and the release film can be greater than 2 mm, 3 mm, 4 mm, or 5 mm, ensuring the accuracy of the color layer. When it is necessary to scrape off the molding medium on the release film, the flipping power unit moves the scraper to a vertically downward or tilted downward position (working state), lowering the scraper bottom below the bottom of the coating component. The scraper bottom is at its lowest position and can press against the top surface of the release film. It can then move under the drive of the horizontal power mechanism, pushing the molding medium above the release film. To avoid excessive force from the scraper pressing on the release film and damaging it, the scraper is a silicone scraper. The area of ​​the scraper that contacts the release film is fluorinated to prevent residual molding medium on the scraper.

[0093] The method of controlling the material cleaning component to scrape off the molding medium above the structural surface includes: controlling the flipping power component to drive the scraper to move so that the scraper switches to the working state; controlling the scraper to move so that the scraper scrapes off the molding medium above the structural surface; and controlling the flipping power component to drive the scraper to move so that the scraper switches to the idle state.

[0094] The scraper design ensures the release film remains clean, reducing the residue of the molding medium. This allows the next layer of coating to cure directly on the release film, avoiding the difficulty in controlling the thickness of the color layer caused by the presence of the molding medium between the coating and the release film. It also prevents the coating from easily flowing and overflowing when sprayed onto the molding medium.

[0095] In one embodiment, the 3D printing apparatus further includes a memory for storing computer programs;

[0096] A processor is a step used to implement any of the three-dimensional printing methods when executing a computer program.

[0097] In one embodiment, the present invention also provides a computer-readable storage medium storing at least one executable instruction that causes a processor to perform any of the steps of a 3D printing method.

[0098] Based on this understanding, the technical solution of this application can be embodied in the form of a software product. The software product to be identified can be stored in a non-volatile storage medium, such as a CD-ROM, USB flash drive, or portable hard drive, and includes several instructions to enable a computer device, such as a personal computer, server, or network device, to execute the 3D printing method described in this application.

[0099] This application also provides the following implementation methods:

[0100] Reference numeral 1. A three-dimensional printing method applied to a three-dimensional printing device to print a model to be formed, the three-dimensional printing device including a construction surface and a forming platform, the three-dimensional printing method including:

[0101] A color layer is set on the construction surface, and the color layer matches the color required for this printing layer of the model to be formed;

[0102] Add molding medium to the structure surface. The molding medium covers the color layer. The area covered by the molding medium on the structure surface corresponds to the layer to be printed.

[0103] Control the molding platform to move closer to the structural surface so that the distance between the molding platform and the structural surface is equal to the preset printing height corresponding to this printing layer;

[0104] Based on the edge shape information of this printing layer, the molding medium is cured on the molding platform to form this printing layer.

[0105] Label 2, according to the 3D printing method of Label 1, wherein a color layer is set on the construction surface, including:

[0106] Based on the color information of this printing layer, a color layer is applied to the structural surface.

[0107] Label 3, according to the 3D printing method of Label 2, wherein the 3D printing equipment further includes a curing component, and after applying a color layer to the structural surface based on the color information of the printed layer, it includes:

[0108] Control the curing component to cure the color layer on the surface of the contact structure, and at most a portion of the surface of the curing color layer on the opposite structure.

[0109] Label 4. According to the three-dimensional printing method of Label 1, wherein the three-dimensional printing equipment includes a layering assembly, and a molding medium is added to the construction surface, including:

[0110] The control unit adds molding medium to the structure surface, and the thickness of the molding medium is greater than or equal to the thickness of the current printing layer.

[0111] Label 5. According to the 3D printing method in label 1, the preset printing height corresponding to the current printing layer is as follows:

[0112] The height of the printed layer is the sum of the thickness of the model to be formed.

[0113] Label 6. According to the 3D printing method of Label 1, the 3D printing equipment further includes a curing component, which cures the molding medium on the molding platform according to the edge shape information of the printed layer to form the printed layer of the model to be printed, including:

[0114] Based on the edge shape information of this printing layer, the curing component is controlled to irradiate the molding medium to form this printing layer of the model to be printed on the surface of the molding platform or on the completed model of the model to be printed on the molding platform. This printing layer includes a molding medium layer and a color layer.

[0115] Label 7. According to the 3D printing method of Label 2, the 3D printing equipment further includes a coating component, which coats a color layer on the structure surface based on the color information of the printed layer, specifically including:

[0116] Based on the color information of this printed layer, the coating component is controlled to apply paint to the structure surface.

[0117] Label 8. According to the 3D printing method of Label 7, the color information of the printed layer includes at least one sub-coating area, all sub-coating areas constitute the coating area, and the color information of the printed layer also includes the color information corresponding to the sub-coating areas. The step of controlling the coating component to apply paint to the structure surface based on the color information of the printed layer specifically includes:

[0118] Based on the sub-coating area and the corresponding color information, the coating component is controlled to apply paint to the structural surface.

[0119] Label 9. According to the 3D printing method in Label 8, where,

[0120] The edge shape of the coated area is consistent with the edge shape of the printed layer.

[0121] Alternatively, the edge shape of a portion of the sub-coated area may be consistent with the edge shape of a portion of the printed layer.

[0122] Alternatively, the coating area can be an area that matches the edge shape of the current printed layer and has a preset width.

[0123] Label 10. According to the 3D printing method of label 3, the step of controlling the curing of the color layer of the curing component specifically includes:

[0124] The curing component is controlled to illuminate the color layer according to the edge shape of the printed layer;

[0125] Alternatively, the curing component can be controlled to illuminate the color layer according to the edge shape of the color layer;

[0126] Alternatively, control the curing component to irradiate the color layer with at least the area covered by the color layer;

[0127] Alternatively, control the movement of the curing component to illuminate the color layer.

[0128] Reference numeral 11. According to the three-dimensional printing method of reference numeral 4, the three-dimensional printing equipment further includes a media tank, the media tank includes a receiving cavity, the media tank further includes a release film, the release film at least constitutes part of the inner wall of the receiving cavity, and the release film is a structural surface; the step of adding a molding medium to the structural surface by controlling the adding assembly to communicate with the receiving cavity specifically includes:

[0129] Control the addition of a pre-set amount of molding medium onto the structural surface using the addition and dispensing components;

[0130] Alternatively, the feeding and discharging components can be controlled to add molding medium to the structural surface at a preset flow rate for a preset time.

[0131] Alternatively, the 3D printing equipment may also include a liquid level sensor, which is positioned opposite the receiving cavity, and the step of controlling the addition of the forming medium to the construction surface by the dispensing assembly specifically includes:

[0132] The control and addition components continuously add molding medium to the structural surface;

[0133] Receives the liquid level sensing signal sent by the liquid level sensing device;

[0134] If the liquid level reaches the preset level, the control unit will stop adding molding medium to the structure surface;

[0135] Alternatively, the 3D printing equipment may also include a weighing device connected to a media tank, and a step of controlling the addition of molding media to the construction surface by the feeding assembly, specifically including:

[0136] The control and addition components continuously add molding medium to the structural surface;

[0137] Receive the weight value sent by the weighing item;

[0138] If the weight value reaches the preset weight, the control unit stops adding molding medium to the structure surface.

[0139] Label 12. According to the 3D printing method of Label 1, after the step of curing the molding medium on the molding platform to form the printing layer of the model to be printed based on the edge shape information of the current printing layer, the method further includes:

[0140] Control the molding platform to move to at least the preset release height that causes the current printed layer to detach from the construction surface.

[0141] Reference numeral 13. According to the three-dimensional printing method of reference numeral 12, after the step of controlling the forming platform to move to at least a preset release height that causes the current printed layer to detach from the construction surface, the method further includes:

[0142] Control the discharge of the forming medium from the structural surface by the discharge assembly.

[0143] Reference numeral 14, in the three-dimensional printing method according to reference numeral 13, after the step of controlling the discharge of the forming medium from the construction surface by the addition and removal of the assembly, the method further includes:

[0144] Repeat the process of taking the next layer of the current printing layer as the current printing layer, setting a color layer on the structure surface, and matching the color required for the current printing layer of the model to be formed; adding molding medium to the structure surface, the molding medium covering the color layer, and the area covered by the molding medium on the structure surface corresponding to the current printing layer; controlling the molding platform to move closer to the structure surface so that the distance between the molding platform and the structure surface is equal to the preset printing height corresponding to the current printing layer; according to the edge shape information of the current printing layer, solidifying the molding medium on the molding platform to form the current printing layer of the model to be formed, controlling the molding platform to move to at least the preset release height of the current printing layer from the structure surface, and controlling the discharge component to discharge the molding medium on the structure surface, until the printing of the model to be formed is completed.

[0145] Label 15. According to the 3D printing method of label 12, where,

[0146] The preset release height is the sum of the coating clearance height and the thickness of the completed model of the model to be molded.

[0147] Reference numeral 16. The three-dimensional printing method according to reference numeral 13, wherein the three-dimensional printing equipment further includes a material clearing assembly; after the step of controlling the discharge assembly to discharge the forming medium from the structural surface, the method further includes:

[0148] Control the material clearing component to remove the molding medium above the structure surface.

[0149] Reference numeral 17. According to the 3D printing method of reference numeral 16, the cleaning component includes a scraper and a flipping power component. The scraper is connected to the flipping power component. The scraper has a working state and an idle state. When the scraper switches from the working state to the idle state, the bottom end of the scraper moves away from the structure surface. The specific steps of controlling the cleaning component to remove the forming medium above the structure surface include:

[0150] The control flipping power component drives the scraper to move, so that the scraper switches to the working state;

[0151] Control the movement of the scraper so that it scrapes away the forming medium above the structural surface;

[0152] The control mechanism drives the scraper to move, so that the scraper switches to an idle state.

[0153] Reference numeral 18. According to the three-dimensional printing method of reference numeral 1, the three-dimensional printing equipment further includes a curing component.

[0154] The curing component includes a single light source positioned on one side of the molding platform opposite to the structural surface. The light source is used to irradiate the color layer and the molding medium to form the printed layer.

[0155] Alternatively, the curing assembly includes a first light source and a second light source. The first light source is located on the side of the construction surface close to the molding platform to irradiate the color layer, and the second light source is located on the side of the construction surface opposite to the molding platform to irradiate the color layer and the molding medium to form the printed layer.

[0156] Label 19. According to the 3D printing method of Label 2, before the step of applying a color layer to the structure surface based on the color information of the current printing layer, the method further includes:

[0157] Obtain the color information corresponding to this printing layer;

[0158] One layer of the model to be formed is used as the printing layer;

[0159] Control the molding platform to move to the initial position.

[0160] Reference numeral 20. A three-dimensional printing apparatus, comprising:

[0161] Memory, used to store computer programs;

[0162] A processor is used to execute computer programs to implement the steps of a 3D printing method as described in any of the numbers 1 to 19.

[0163] Reference numeral 21. A computer-readable storage medium, wherein the computer-readable storage medium stores at least one executable instruction that causes a processor to perform the steps of the three-dimensional printing method as described in any one of reference numerals 1 to 19.

[0164] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A three-dimensional printing method, characterized in that, A method for printing a model to be formed is applied to a 3D printing device, the 3D printing device including a construction surface, a forming platform, and a curing component, the construction surface being used for release molding, and the 3D printing method including: A color layer is provided on the structural surface, and the color layer matches the color required for this printing layer of the model to be formed; The curing component is controlled to cure the surface of the color layer in contact with the structured surface, and to cure at most a portion of the surface of the color layer opposite to the structured surface; A molding medium is added to the structural surface, the molding medium covering the color layer, and the area of ​​the molding medium covering the structural surface corresponds to the current printing layer; Control the molding platform to move closer to the structural surface, so that the distance between the molding platform and the structural surface is equal to the preset printing height corresponding to the current printing layer; Based on the edge shape information of the printed layer, the molding medium is cured on the molding platform to form the printed layer.

2. The three-dimensional printing method according to claim 1, characterized in that, The provision of a color layer on the structural surface includes: Based on the color information of the printed layer, a color layer is applied to the structural surface.

3. The three-dimensional printing method according to claim 1, characterized in that, The 3D printing equipment includes a layering assembly, and the step of adding a molding medium to the structural surface includes: The addition assembly is controlled to add a molding medium to the structural surface, wherein the thickness of the molding medium is greater than or equal to the thickness of the current printing layer.

4. The three-dimensional printing method according to claim 1, characterized in that, The preset printing height corresponding to the current printing layer is specifically as follows: The height of the printed layer is the sum of the thickness of the completed model to be formed.

5. The three-dimensional printing method according to claim 1, characterized in that, The 3D printing equipment also includes a curing component, wherein the step of curing the molding medium on the molding platform according to the edge shape information of the current printing layer to form the current printing layer of the model to be printed includes: Based on the edge shape information of the current printing layer, the curing component is controlled to irradiate the molding medium to form the current printing layer of the model to be printed on the surface of the molding platform or on the completed model of the model to be printed on the molding platform. The current printing layer includes a molding medium layer and a color layer.

6. The three-dimensional printing method according to claim 2, characterized in that, The 3D printing equipment also includes a coating component, wherein a color layer is coated on the structural surface according to the color information of the current printing layer, specifically including: Based on the color information of the current printing layer, the coating component is controlled to apply paint to the structural surface.

7. The three-dimensional printing method according to claim 6, characterized in that, The color information of the printed layer includes at least one sub-coating area, and all of the sub-coating areas constitute the coating area. The color information of the printed layer also includes the color information corresponding to the sub-coating areas. Based on the color information of the printed layer, the step of controlling the coating component to apply paint to the structural surface specifically includes: Based on the sub-coating area and the color information corresponding to the sub-coating area, the coating component is controlled to apply paint to the structural surface.

8. The three-dimensional printing method according to claim 7, characterized in that, The edge shape of the coated area is consistent with the edge shape of the printed layer. Alternatively, the edge shape of a portion of the sub-coated area may be consistent with the edge shape of a portion of the printed layer. Alternatively, the coating area may be a region that matches the edge shape of the printed layer and has a preset width.

9. The three-dimensional printing method according to claim 1, characterized in that, The step of controlling the curing component to cure the color layer specifically includes: The curing component is controlled to illuminate the color layer according to the edge shape of the printed layer. Alternatively, the curing component can be controlled to illuminate the color layer according to the edge shape of the color layer; Alternatively, the curing component can be controlled to irradiate the color layer with an area that at least covers the color layer. Alternatively, the curing component can be controlled to move and illuminate the color layer.

10. The three-dimensional printing method according to claim 3, characterized in that, The 3D printing equipment further includes a media tank, the media tank including a receiving cavity, the media tank further including a release film, the release film at least partially constituting the inner wall of the receiving cavity, and the release film being the structural surface; the feeding assembly is in communication with the receiving cavity, and the step of controlling the feeding assembly to add molding media to the structural surface specifically includes: The addition component is controlled to add a preset amount of molding medium to the structural surface; Alternatively, the feeding component can be controlled to add molding medium to the structural surface at a preset flow rate for a preset time. Alternatively, the 3D printing equipment further includes a liquid level sensor, which is opposite to the receiving cavity, and the step of controlling the adding assembly to add the molding medium to the structural surface specifically includes: The addition and dispensing components are controlled to continuously add molding medium to the structural surface; Receives the liquid level sensing signal sent by the liquid level sensing device; If the liquid level reaches the preset level, control the addition and discharge components to stop adding molding medium to the structural surface; Alternatively, the 3D printing equipment may further include a weighing component connected to the media tank, wherein the step of controlling the adding assembly to add molding media to the structural surface specifically includes: The addition and dispensing components are controlled to continuously add molding medium to the structural surface; Receive the weight value sent by the weighing item; If the weight value reaches the preset weight, the adding component is controlled to stop adding molding medium to the structural surface.

11. The three-dimensional printing method according to claim 1, characterized in that, After the step of curing the molding medium on the molding platform according to the edge shape information of the current printing layer to form the current printing layer of the model to be molded, the method further includes: Control the molding platform to move to at least a preset release height that causes the printed layer to detach from the structural surface.

12. The three-dimensional printing method according to claim 11, characterized in that, The 3D printing equipment includes a stacking assembly. After the step of controlling the forming platform to move to at least a preset release height that causes the currently printed layer to detach from the structural surface, the method further includes: Control the discharge assembly to discharge the molding medium from the structural surface.

13. The three-dimensional printing method according to claim 12, characterized in that, After the step of controlling the discharge assembly to discharge the molding medium from the structural surface, the method further includes: The process is repeated, taking the next layer of the current printing layer as the current printing layer, setting a color layer on the structure surface, the color layer matching the color required for the current printing layer of the model to be formed; adding a molding medium to the structure surface, the molding medium covering the color layer, the coverage area of ​​the molding medium on the structure surface corresponding to the current printing layer; controlling the molding platform to move closer to the structure surface, so that the distance between the molding platform and the structure surface is equal to the preset printing height corresponding to the current printing layer; according to the edge shape information of the current printing layer, curing the molding medium on the molding platform to form the current printing layer of the model to be formed, controlling the molding platform to move to at least a preset release height for the current printing layer to detach from the structure surface, and controlling the discharge assembly to discharge the molding medium on the structure surface, until the printing of the model to be formed is completed.

14. The three-dimensional printing method according to claim 11, characterized in that, The preset release height is the sum of the coating clearance height and the thickness of the completed model of the model to be formed.

15. The three-dimensional printing method according to claim 12, characterized in that, The 3D printing equipment further includes a material clearing assembly; after the step of controlling the feeding and discharging assembly to discharge the forming medium from the structural surface, the method further includes: The cleaning assembly is controlled to remove the molding medium above the structure surface.

16. The three-dimensional printing method according to claim 15, characterized in that, The cleaning assembly includes a scraper and a tilting power component. The scraper is connected to the tilting power component. The scraper has a working state and an idle state. When the scraper switches from the working state to the idle state, the bottom end of the scraper moves away from the structural surface. The step of controlling the cleaning assembly to remove the molding medium above the structural surface specifically includes: The tilting power component is controlled to drive the scraper to move, so that the scraper switches to the working state; Control the movement of the scraper so that the scraper scrapes off the molding medium above the structural surface; The rotating power component is controlled to drive the scraper to move, so that the scraper switches to an idle state.

17. The three-dimensional printing method according to claim 1, characterized in that, The 3D printing equipment also includes a curing component. The curing component includes a single light source, which is located on the side of the structure surface opposite to the molding platform. The light source is used to irradiate the color layer and the molding medium to form the printed layer. Alternatively, the curing component includes a first light source and a second light source. The first light source is disposed on the side of the structure surface near the molding platform to irradiate the color layer, and the second light source is disposed on the side of the structure surface opposite to the molding platform to irradiate the color layer and the molding medium to form the printed layer.

18. The three-dimensional printing method according to claim 2, characterized in that, Before the step of coating a color layer on the structural surface based on the color information of the current printed layer, the method further includes: Obtain the color information corresponding to this printing layer; One layer of the model to be formed is used as the printing layer for this printing; Control the molding platform to move to the initial position.

19. A three-dimensional printing device, characterized in that, include: Memory, used to store computer programs; A processor for executing the computer program to implement the steps of the three-dimensional printing method as described in any one of claims 1 to 18.

20. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one executable instruction that causes a processor to perform the steps of the three-dimensional printing method as described in any one of claims 1 to 18.

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