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Self-adaptive hierarchical algorithm for 3D (three-dimensional) printing

A technology of three-dimensional printing and layered algorithm, applied in the direction of additive processing, etc., can solve the problems of molding accuracy and molding efficiency, and achieve the effect of shortening molding time, ensuring printing accuracy, and improving molding efficiency

Inactive Publication Date: 2016-03-16
TIANJIN UNIV
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  • Claims
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Problems solved by technology

However, most of the current process software adopts the layering method of equal layer thickness, please refer to figure 1 , the layering method is simple but cannot solve the contradiction between molding accuracy and molding efficiency

Method used

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  • Self-adaptive hierarchical algorithm for 3D (three-dimensional) printing
  • Self-adaptive hierarchical algorithm for 3D (three-dimensional) printing
  • Self-adaptive hierarchical algorithm for 3D (three-dimensional) printing

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Embodiment Construction

[0020] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0021] See figure 2 , the 3D model processed by the current 3D printing layered program is in STL format. The 3D model in STL format is made into triangular faces, that is, many triangular faces are used to form the curved shape of the physical model. Therefore, the 3D model in STL format is the right An approximation of the real thing. The STL file of the 3D model contains the coordinate values ​​of the three points of each triangle and the normal vector of the triangle.

[0022] In order to implement adaptive layering, the curvature of each part of the model needs to be calculated first. Then automatically adopt the corresponding layer thickness value according to the size of the curvature.

[0023] The specific method is:

[0024] a) ...

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Abstract

The invention discloses a self-adaptive hierarchical algorithm for 3D (three-dimensional) printing. The self-adaptive hierarchical algorithm comprises the following steps: (1) according to a triangle normal vector of a 3D model in a STL format, solving an included angle alpha 0 between the normal vector of each triangle and the horizontal plane; (2) solving the corresponding layer thickness t0 of each triangle; (3) taking the maximum value of t0 as a try-cut value, carrying out trial hierarchy on the 3D model in the STL format, and beginning from the bottom the model; (4) after completing the first trial hierarchy, determine a layer thickness value of a first layer; ( 5) after determining the layer thickness value of the first layer, on the basis of the first layer, carrying out secondary trial hierarchy with the try-cut value as a layer thickness; (6) repeating the fourth step to determine a layer thickness value of a second layer; and (7) frequently repeating the fifth and sixth steps until hierarchy of the entire 3D model in the STL format is completed. In the premise of ensuring the accuracy of a shaped product, the algorithm can shorten the shaping time and improve the shaping efficiency, guarantee the printing precision and improve the shaping efficiency.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional printing process control, and in particular relates to an adaptive layering algorithm for three-dimensional printing. Background technique [0002] In layered manufacturing or rapid prototyping, model layering is a very important step. The thickness of the layer is not only related to the surface accuracy of the molded part but also to the molding time. If a larger layer thickness value is used, the molding time of the product will be short but the accuracy will be very low; if a smaller layer thickness value is used, the molding accuracy of the product will be high but the molding time will be very long, so there is a gap between molding time and molding accuracy. There is a contradiction. That is to say, during rapid prototyping, on the one hand, it is necessary to reduce the molding time, and on the other hand, it is necessary to improve the surface precision, so as to achieve a win...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/00B33Y50/00
Inventor 王太勇李红宾孙建张雷于志强
Owner TIANJIN UNIV
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