Method for automatically generating support of three-dimensional printing part on basis of scanning biasing
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An automatic generation and three-dimensional printing technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of large amount of calculation, low processing efficiency, and difficult peeling of supports, and achieves simple operation, easy realization, and principle clear effect
Active Publication Date: 2014-05-28
ZHEJIANG UNIV
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Problems solved by technology
[0003] The support of the 3D printed part needs to meet the following requirements: 1. The generated support must ensure sufficient strength and stability to ensure that it and the part it supports will not deform; 2. The support should be as few as possible, and the redundant support It will lead to material waste and reduce processing efficiency; 3. The support should be easy to peel off from the surface of the part. If the support part and the part are bonded too firmly, it will not only increase the time required for support peeling, but also affect the machining accuracy of the part surface in the support area
Solution 1 can achieve the purpose of generating support to a certain extent, but it fails to make good use of the topological information of the model file in the process of generating support, the generated support is not reliable enough, and the support is not easy to peel off
Option 2 takes into account the topological information of the model file, but a single column-shaped support cannot form enough support for the support surface
The tooth-shaped support generated by scheme 3 can support the part better, and also considers the stripping of the support, but the calculation amount is too large and the efficiency is low when generating this tooth-shaped support
In addition, none of the three schemes can be manually edited for supports, and there are problems with the validity and reliability of the generated supports
Method used
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Embodiment 1
[0041] Figure 6 Shown is an STL model of a part to be supported, and now it needs to be supported to ensure that the part will not collapse during the 3D printing process.
[0042] according to figure 1 The process of identifying the normal vector n of each triangle in the STL model, when the component of n in the z direction is less than Then the triangular face needs to generate support, and the connected triangular faces that need to generate support are combined together to obtain the area to be supported, and multiple areas constitute the area set P={P 1 , P 2 , P 3}, P 1 ,P 2 ,P 3 Respectively for a single region that needs to generate supports, such as Figure 6 shown.
[0043] Such as figure 2 As shown, P 1 ,P 2 ,P 3 Project to the xy plane, and generate a series of scan lines 2 along the x and y directions with a spacing of g=6mm inside each projection area, and the edge projection of the area forms a contour line 1, and P 1 ,P 2 ,P 3 The correspondi...
Embodiment 2
[0055] Figure 9 Shown is a part and its support automatically generated by the present invention, it can be seen from the figure that P E The support in the area is not reasonable enough, too fragile, and the support itself is easy to collapse during the 3D printing process, so this part of the support needs to be manually edited.
[0056] Display P in the visual graphical interface E scanlines within the region, such as Figure 10 As shown in (a), delete the original scan line (automatically generated scan line 13), and manually E Draw the scan line inside to get the manually edited scan line 14, such as Figure 10 As shown in (b), after the editing is completed, P E Regenerate the supports in the area, retain the original supports of other parts, and get the edited supports, such as Figure 11 shown.
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Abstract
The invention discloses a method for automatically generating a support of a three-dimensional printing part on the basis of scanning biasing. The method comprises the following steps of determining an area gather requiring a support in an STL (standard template library); respectively projecting areas in the area gather on an xy plane to form projection areas; generating a series of scanning lines which are mutually staggered along the x direction and the y direction on each projection area so as to form a scanning line gather; scanning the scanning lines in the scanning line gather along the z-axis direction; solving two intersection line sequence gathers; solving an intersection point of the two intersection sequence gathers by using parallel lines of which the spacing distances are (d) so as to obtain two groups of intersection point sequence gathers; classifying the two groups of intersection point sequence gathers and biasing the two groups of intersection point sequence gathers in the z-axis direction so as to obtain four groups of corresponding biased point sequence gathers; sequentially selecting three groups of biased point sequence gathers from the four groups of corresponding biased point sequence gathers to create a triangular patch; generating data information of the supporting patch; and generating the support. By using the method, the support of the three-dimensional printing part is generated automatically. The method is clear in principle and easy to operate.
Description
technical field [0001] The present invention relates to the field of three-dimensional printing, in particular to a method for automatically generating part support by means of scanning offset in the three-dimensional printing model processing stage, which can quickly and effectively generate the support required by the part, and can be manually edited. Background technique [0002] 3D printing technology is a technology based on digital model files, using powdered metal or plastic and other bondable materials to construct parts by layer-by-layer printing. The main processing process is to print the parts to be printed in a certain The layer thickness is sliced and layered, and then each layer is printed from the base. The current layer is formed on the previous layer, and the previous layer plays a role in positioning and supporting the current layer. If there is a large change in the contour and area between the front and rear layers, the contour of the previous layer ca...
Claims
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