Research on Adaptive Layering Algorithm of Triangular Facet Normal Vector of STL Model in Additive Manufacturing
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摘要: 本文提出了增材制造技术中STL模型三角面片法向量自适应分层新算法。该方法寻找与层厚t相交的三角面片的最小法向量，应用三维模型体素中x-y分辨率和STL模型中三角面片法向量与制造方向间夹角变化关系，实现STL模型的自适应分层。用此方法分层，减少了分层参数处理的复杂性，使自适应分层变得更加简单且易实现，得到的分层厚度值更加准确。由于自适应分层是在允许的误差范围内得到的分层厚度，因此在STL模型轮廓变化明显的区域分层更加精细。Abstract: In the paper, a new algorithm for the adaptive layering of triangular facet of the stereolithography(STL) model is proposed in the additive manufacturing technology. In this method, the minimum normal vector of the triangular facet intersecting with the thickness t of the layer is found, and then the relationship between the x-y resolution in the three-dimensional model voxels and the triangular facet normal vector in the STL model and the change direction of the manufacturing direction is applied to achieve adaptive layer of the STL model. With this method, the complexity of layering parameter processing is reduced, the adaptive layering becomes simpler and easier to realize, and the obtained layer thickness is more accurate. Since the adaptive layering is the layer thickness obtained within the allowable errors range, layering in the contour change area of the STL model is more refined.
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Key words:
- additive manufacturing /
- STL model /
- adaptive layering /
- triangular facet /
- normal vector
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表 1 不同表面角对应的分层厚度
最小表面角θ/(°) 分层厚度/mm x-y分辨率0.01 mm x-y分辨率0.05 mm x-y分辨率0.1 mm 5 0.01 0.01 0.01 10 0.01 0.01 0.015 15 0.01 0.01 0.025 20 0.01 0.015 0.035 25 0.01 0.02 0.045 30 0.01 0.025 0.055 35 0.01 0.035 0.07 40 0.01 0.04 0.08 45 0.01 0.05 0.1 50 0.01 0.055 0.1 55 0.01 0.07 0.1 60 0.015 0.085 0.1 65 0.02 0.1 0.1 70 0.025 0.1 0.1 75 0.035 0.1 0.1 80 0.055 0.1 0.1 85 0.1 0.1 0.1 90 0.1 0.1 0.1 95 0.1 0.1 0.1 100 0.055 0.1 0.1 105 0.035 0.1 0.1 110 0.025 0.1 0.1 115 0.02 0.1 0.1 120 0.015 0.085 0.1 125 0.01 0.07 0.1 130 0.01 0.055 0.1 135 0.01 0.05 0.1 140 0.01 0.04 0.08 145 0.01 0.035 0.07 150 0.01 0.025 0.055 155 0.01 0.02 0.045 160 0.01 0.015 0.035 165 0.01 0.01 0.025 170 0.01 0.01 0.015 175 0.01 0.01 0.01 180 0.01 0.01 0.01 
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表 2 不同x-y分辨率的自适应分层的分层数和分层耗时比较
x-y分辨率/mm 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.2 0.4 0.6 0.8 1 分层总数 1138 646 471 387 343 320 310 303 298 259 253 251 250 250 分层耗时/s 178.815 103.289 74.935 61.621 54.456 51.192 48.091 47.774 46.824 41.236 40.284 40.106 39.106 39.791
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