3D printing digital model sectioning and interface designing method, and application thereof

A digital model and 3D printing technology, applied in the field of 3D printing modeling, can solve the problems that no patent publications have been found, data cannot be printed correctly, and inner surface information is ignored

Active Publication Date: 2018-01-19
CAPITAL NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During 3D printing, the data including the inner surface cannot be printed correctly. The current 3D printing software repairs this kind of data by removing the inner surface data and only retaining the outer surface grid for printing. The defect of this processing method is that it ignores the The obtained internal surface information cannot be used to additively manufacture internal information without loss
[0004] The invention provides a method of cutting triangular mesh data and adding interfaces to solve the problem that the digital model including the inner surface cannot be 3D printed, and how to restore the original appearance of the parts after cutting
[0005] Through the search, no patent publications related to the patent application of the present invention have been found

Method used

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  • 3D printing digital model sectioning and interface designing method, and application thereof
  • 3D printing digital model sectioning and interface designing method, and application thereof
  • 3D printing digital model sectioning and interface designing method, and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0108] A 3D printing digital model cutting and interface design method, the steps are as follows:

[0109] (1) Input the 3D printing digital model, specify the tangent plane by specifying the parameters of the plane equation, cut the model by using the positional relationship between the point and the plane, decompose it into different blocks, obtain the decomposed digital model, and make the original 3D printing digital model The inner surface of the model is transformed into an outer surface;

[0110] (2) If you need to decompose the model in more detail, you can repeat step (1) to cut the 3D printed digital model multiple times; after the model is cut, an interface will be added to the cut surface formed by the cut for splicing and decomposition post-digital model;

[0111] (3) Use the method of picking up triangular patches to specify the interface position on the cut surface formed by cutting the 3D printing data model, that is, click to select the triangular patch on th...

Embodiment 2

[0152] A 3D printing digital model cutting and interface design method, the steps are as follows:

[0153] Specify the tangent plane, the tangent relationship between the tangent plane and the triangular patch is as follows Figure 2-1 As shown in , the tangent relationship between all the patches in the triangular mesh and the plane is judged, and two decomposed digital models are obtained, as well as several closed line segments on the plane. like Figure 2-2 As shown in , the scattered line segments are connected end to end to obtain a group of closed edges, and the inclusion relationship of the closed edges is judged to obtain a polygonal area surrounded by the closed edges. like Figure 2-3 As shown in , triangulation is performed inside the polygon area, and the triangulation results are added to the two decomposed digital models respectively, keeping the normal direction of the triangle patch in the decomposed digital model consistent with the outward direction of the...

Embodiment 3

[0159] A 3D printing digital model cutting and interface design method, the specific steps are as follows:

[0160] (1) Take the plane as an example to cut R 3 For digital models in space, the general form of the plane equation is as follows:

[0161] Ax+By+Cz+D=0 (1.1)

[0162] where (A,B,C) is R 3 A non-zero vector in space is called the normal vector of the plane. In order to make the expression of the equation unique, it is stipulated that (A, B, C) is a unit vector, that is, the unit normal direction.

[0163] After specifying the parameters (A,B,C,D) of the plane equation, the plane equation can be uniquely determined, and the plane will be R 3 The space is divided into positive half space and negative half space. When R 3 When the digital model in space is tangent to this plane, the model is also divided into two parts, one in the positive half space and the other in the negative half space. The basic unit of a digital model is a triangle patch, which consists of...

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Abstract

The invention discloses a 3D printing digital model sectioning and interface designing method. The method comprises the following steps: sectioning a 3D printing digital model based on designated tangent planes, and repeating the step if the sectioning needs to be carried out for multiple times; designating interface positions on sections, obtaining boundary curves near interfaces through fitting,and calculating interface base points; iteratively calculating interface heights and selecting interface directions; calculating gap widths, and adding semi-circular structures at interface bulges and interface grooves; and splicing the interfaces on the model. The method provided by the invention has the advantages that through the sectioning of the 3D printing digital model, the problem that a3D printer cannot print internal information of the model is solved, and components obtained after disassembly can be spliced to recover an original appearance through the addition of the interfaces to the model; manual information interaction is utilized, so that sectioning positions and the interface positions can better meet user requirements; and furthermore, the maximum printable volume of the printer is increased, the weight of a finished product is reduced, and the model printing time is shortened.

Description

technical field [0001] The invention belongs to the technical field of 3D printing modeling, in particular, a method and application for 3D printing digital model modeling. The model cutting method and interface design method of the method can be applied to the geometric modeling of 3D printing digital models. Such as digital models containing internal surface information, digital models that are too large, etc. Background technique [0002] 3D printing technology, that is, additive manufacturing technology, is a technology that constructs objects by printing adhesive materials layer by layer based on digital model files. The standard file format for 3D printed digital models is the STL file format, which stores triangular mesh data for approximately simulating the surface of an object. Only STL files that meet the requirements of triangular mesh surface closure and no non-manifold structure can be used for 3D printing. This type of data is called printable data, and data t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/10G06F17/50B29C67/00B33Y50/00
Inventor 盛文娟赵星
Owner CAPITAL NORMAL UNIVERSITY
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