CN112519203A - Efficient nondestructive supporting method for surface projection photocuring 3D printing based on gray level exposure - Google Patents
Efficient nondestructive supporting method for surface projection photocuring 3D printing based on gray level exposure Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
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Abstract
本发明涉及面投影光固化3D打印支撑方法，更具体的说是一种基于灰度曝光的面投影光固化3D打印高效无损伤支撑方法，该方法包括以下步骤：S1；建立目标零件、灰度结构和薄壁结构的模型；S2；对目标零件、灰度结构和薄壁结构模型分别进行相同层厚的切片图像处理，对其中灰度结构模型切片图像进行灰度处理，目标零件切片图像、灰度结构切片图像和薄壁结构切片图像层层对应合成为打印投影图像；S3；控制曝光量为所用液态光敏树脂材料的临界固化能量，基于合成的最终打印投影图像进行面投影光固化3D打印；可以有效解决现有技术中的光固化3D打印支撑方法效率低、打印困难以及精度损失大的问题。
The invention relates to a surface projection light-curing 3D printing support method, and more particularly relates to a gray-scale exposure-based surface projection light-curing 3D printing high-efficiency non-damage support method. The method includes the following steps: S1; Models of structure and thin-walled structure; S2; Slice image processing with the same layer thickness is performed on the target part, gray-scale structure and thin-walled structure model respectively, and gray-scale processing is performed on the sliced image of the gray-scale structure model, and the sliced image of the target part, The grayscale structural slice image and the thin-walled structural slice image are correspondingly synthesized into a printed projection image layer by layer; S3; the exposure amount is controlled to be the critical curing energy of the liquid photosensitive resin material used, and surface projection photocuring 3D printing is performed based on the synthesized final printed projection image. ; It can effectively solve the problems of low efficiency, difficult printing and large loss of precision of the light-curing 3D printing support method in the prior art.
Description
Technical Field
The invention relates to an area projection photocuring 3D printing support method, in particular to an area projection photocuring 3D printing high-efficiency nondestructive support method based on gray level exposure.
Background
The 3D printing technology has the great advantages compared with the traditional manufacturing method in the aspect of manufacturing the complex three-dimensional structure by using the layer-by-layer accumulation forming principle different from the traditional material reduction manufacturing mode. However, due to the layer accumulation forming mode, the 3D printing process usually needs to design and add a support structure to assist the accurate forming of the part with the cantilever feature, and the design, addition and subsequent mechanical removal processes of the support structure greatly reduce the efficiency of the 3D printing, damage the supported surface of the formed part and reduce the printing quality, which is particularly prominent in the surface projection photocuring 3D printing technology featuring high precision and high efficiency. Therefore, intensive research on the surface projection photocuring 3D printing support method is required to fully exert the manufacturing advantages of high precision and high efficiency. At present, the surface projection photocuring 3D printing support method comprises a traditional entity support method, a removable sacrificial material support method and a high-viscosity material self-support method, wherein the traditional entity support method supports the suspended surface of a part by designing a columnar structure and removes the part by a mechanical mode after printing is finished, the method is time-consuming and labor-consuming, and inevitably damages the surface of the part and reduces the printing quality; the removable sacrificial material supporting method is used for a multi-material photocuring 3D printing process, sacrificial materials which are removed in a dissolving, corrosion or ablation mode are used as supporting materials to form a supporting structure, parts are printed in a multi-material switching mode, and after printing is completed, the supporting is removed in the dissolving, corrosion or ablation mode, and a part main body is reserved; the self-supporting method of the high-viscosity material uses the light-cured printing material with higher viscosity, such as light-cured ceramic slurry, high-viscosity photosensitive resin and the like, and realizes printing by utilizing the supporting effect of the high-viscosity raw material on the structure of the cured and formed part.
Disclosure of Invention
The invention aims to provide a gray level exposure-based efficient nondestructive support method for area projection photocuring 3D printing, which can solve the problems of low efficiency, difficulty in printing, low precision and the like of the existing support method for area projection photocuring 3D printing.
The purpose of the invention is realized by the following technical scheme:
a gray level exposure-based efficient nondestructive supporting method for surface projection photocuring 3D printing comprises the following steps:
s1; establishing models of a target part, a gray structure and a thin-wall structure;
s2; respectively carrying out slice image processing on the target part, the gray structure and the thin-wall structure model in the same layer thickness, carrying out gray processing on the slice image of the gray structure model, and correspondingly combining the slice image of the target part, the slice image of the gray structure and the slice image of the thin-wall structure layer by layer to form a printing projection image;
s3; controlling the exposure as the critical curing energy of the used liquid photosensitive resin material, and performing surface projection photocuring 3D printing based on the synthesized final printing projection image.
As further optimization of the technical scheme, the efficient nondestructive supporting method for surface projection photocuring 3D printing based on gray level exposure is characterized in that the number of the target part slice images, the number of the gray level structure slice images and the number of the thin-wall structure slice images are the same.
As a further optimization of the technical scheme, the invention relates to a gray scale exposure-based surface projection photocuring 3D printing efficient nondestructive support method, wherein the modeling method of the gray scale structure comprises the following steps:
s1; a cuboid or cylinder model completely covering the target part model is built upwards on the same bottom surface;
s2; and deleting the target part model coated in the model.
As a further optimization of the technical scheme, the invention relates to a gray-scale exposure-based surface projection photocuring 3D printing efficient nondestructive support method, wherein the thin-wall structure modeling method comprises the following steps: on the basis of a gray structure model in the shape of a cuboid or a cylinder, a thin-wall model with the surrounding side coated and the consistent shape is established.
As a further optimization of the technical scheme, the invention relates to a gray level exposure-based efficient nondestructive support method for surface projection photocuring 3D printing, and the gray level of an image after gray level processing of a gray level structure model slice image is 0.1-0.5 times of the gray level of an original slice image.
As further optimization of the technical scheme, the invention relates to a surface projection photocuring 3D printing efficient nondestructive supporting method based on gray level exposure.
As a further optimization of the technical scheme, the invention relates to a gray-scale exposure-based efficient nondestructive support method for surface projection photocuring 3D printing, and the method for taking out the target part comprises the following steps: and after printing is finished, taking down the printed matter, and soaking the printed matter in ethanol for 10min-2h to obtain a complete target part.
The gray level exposure-based efficient nondestructive supporting method for the surface projection photocuring 3D printing has the beneficial effects that:
the invention relates to a high-efficiency nondestructive supporting method for surface projection photocuring 3D printing based on gray level exposure, which can control the printing exposure of a gray level structure during printing through gray level processing of a gray level structure model slice image, adopts a partially polymerized sol gray level structure formed by local gray level exposure to wrap a target part to play a supporting role, additionally prints an outer ring thin-wall structure as a constraint to limit the outflow of internal sol, and can effectively solve the problems of low efficiency, difficulty in printing and high precision loss of a photocuring 3D printing supporting method in the prior art.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of the printing process of the gray-scale exposure-based area projection photocuring 3D printing efficient nondestructive supporting method;
FIG. 2 is a schematic diagram of the modeling, interlayer slice extraction, gray scale processing, and interlayer final projection image synthesis process of the present invention.
In the figure: a resin tank 1; a liquid photosensitive resin material 2; a printing substrate 3; a thin-walled structure 4; a grey scale structure 5; a target part 6; the area projection light 7; a surface projector 8.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
the embodiment is described below with reference to fig. 1 to 2, and a method for performing efficient nondestructive support for surface projection photocuring 3D printing based on gray scale exposure includes the following steps:
s1; establishing models of a target part 6, a gray structure 5 and a thin-wall structure 4;
s2; respectively carrying out slice image processing on the target part 6, the gray structure 5 and the thin-wall structure 4 model with the same layer thickness, carrying out gray processing on the slice image of the gray structure 5 model, and correspondingly combining the slice image of the target part 6, the slice image of the gray structure 5 and the slice image of the thin-wall structure 4 layer by layer to form a printing projection image;
s3; controlling the exposure as the critical curing energy of the used liquid photosensitive resin material, and performing surface projection photocuring 3D printing based on the synthesized final printing projection image; the printing exposure of the gray structure 5 during printing can be controlled by processing a gray structure 5 model slice image, the partially polymerized sol gray structure 5 formed by local gray exposure is used for wrapping a target part 6 to play a supporting role, the outer ring thin-wall structure 4 is additionally printed to be used as a constraint to limit the outflow of the internal sol, and the problems of low efficiency, difficulty in printing and high precision loss of the photocuring 3D printing supporting method in the prior art can be effectively solved.
The second embodiment is as follows:
the present embodiment will be described with reference to fig. 1 to 2, and the present embodiment further describes the first embodiment in which the number of the target part 6 slice images, the number of the grayscale structure 5 slice images, and the number of the thin-walled structure 4 slice images are the same.
The third concrete implementation mode:
the present embodiment is described below with reference to fig. 1 to 2, and the second embodiment is further described in the present embodiment, in which the method for modeling the gray structure 5 is:
s1; a cuboid or cylinder model completely covering the model of the target part 6 is established upwards on the same bottom surface;
s2; deleting a target part 6 model coated in the model; compared with the traditional solid supporting method, a lot of time is saved by designing and adding the support.
The fourth concrete implementation mode:
the present embodiment is described below with reference to fig. 1 to 2, and the present embodiment further describes an embodiment three, where the thin-wall structure 4 is modeled by: on the basis of a gray structure 5 model in the shape of a cuboid or a cylinder, establishing a thin-wall model which is coated on the periphery and has consistent shape; the additional printing outer ring thin-wall structure 4 is used for restricting the outflow of the internal sol, so that the problems of low efficiency, difficulty in printing and high precision loss of the photocuring 3D printing support method in the prior art can be effectively solved.
The fifth concrete implementation mode:
the fourth embodiment will be described with reference to fig. 1 to 2, and the fourth embodiment will be further described in the present embodiment, in which the gray scale of the processed image of the gray scale structure 5 model slice image is 0.1 to 0.5 times the gray scale of the original slice image.
The sixth specific implementation mode:
the embodiment is described below with reference to fig. 1 to 2, and the embodiment further describes an embodiment five, in which the model slice image of the gray structure 5 is subjected to gray processing, exposure energy is critical curing energy of the used liquid photosensitive resin material, the gray structure 5 is in a partially polymerized sol state, and the gray structure 5 in the sol state can be directly dissolved and removed in ethanol; the critical curing energy is the minimum energy required by the curing and forming of the used liquid photosensitive resin material, belongs to the inherent property of the material, and is different due to different material types, but the invention is suitable for all liquid photosensitive resin materials in principle, and does not limit the type of the used material; when printing is carried out, the gray structure 5 is subjected to gray processing, exposure energy is critical curing energy of the used liquid photosensitive resin material, the gray structure 5 is in a partially polymerized sol state and has relatively high viscosity, the gray structure can support and fix the target part 6, compared with a high-viscosity material self-supporting method, the printing process is not influenced by high-viscosity raw materials, and a high-viscosity area is only locally manufactured in real time according to needs.
The seventh embodiment:
the present embodiment will be described below with reference to fig. 1 to 2, and the sixth embodiment will be further described in the present embodiment, in which the method of removing the target part 6 is: taking down the printed matter after printing, and soaking in ethanol for 10min-2h to obtain a complete target part 6; after printing is finished, the gray structure 5 in the sol state can be directly dissolved and removed in ethanol, and the thin-wall structure 4 is not directly contacted with the target part 6, so that the gray structure 5 is directly separated from the target part 6 while being dissolved, and further the independent and complete target part 6 is obtained.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and that various changes, modifications, additions and substitutions which are within the spirit and scope of the present invention and which may be made by those skilled in the art are also within the scope of the present invention.
Claims (7)
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| CN114261096A (en) * | 2021-12-29 | 2022-04-01 | 先临三维科技股份有限公司 | Partition exposure control method, printing method, device, equipment and medium |
| CN115446948A (en) * | 2022-08-19 | 2022-12-09 | 康硕(德阳)智能制造有限公司 | 3D printing method for photocuring formed ceramic based on semi-cured support |
| CN117207528A (en) * | 2023-09-28 | 2023-12-12 | 绿钥生物科技(广州)有限公司 | Volume biological printing light intensity distribution control method based on projection algorithm |
| CN120588498A (en) * | 2025-08-06 | 2025-09-05 | 北京大学口腔医学院 | A 3D printed part morphology control method and system based on support structure morphology compensation |
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| CN115446948A (en) * | 2022-08-19 | 2022-12-09 | 康硕(德阳)智能制造有限公司 | 3D printing method for photocuring formed ceramic based on semi-cured support |
| CN117207528A (en) * | 2023-09-28 | 2023-12-12 | 绿钥生物科技(广州)有限公司 | Volume biological printing light intensity distribution control method based on projection algorithm |
| CN120588498A (en) * | 2025-08-06 | 2025-09-05 | 北京大学口腔医学院 | A 3D printed part morphology control method and system based on support structure morphology compensation |
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