共查询到10条相似文献,搜索用时 140 毫秒
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为满足CAD软件与快速成形领域的数据交换需要,提出了一种Parasolid数据的STL变换方法。利用Parasolid建模核心的PK-TOPOL-facet()函数将Parasolid模型按STL文件规则进行三角网格化,通过返回的拓扑信息构建三角面片与它的顶点和法向量的拓扑关系,并由此生成了STL文件。应用实例和Solidworks软件诊断表明,采用该方法可以将Parasolid文件变换为STL文件,生成的STL模型中无错误面和缝隙存在。 相似文献
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Chung-Shing Wang Teng-Ruey Chang 《The International Journal of Advanced Manufacturing Technology》2008,37(7-8):770-781
The main objective of this research is to identify ways to simplify the STL meshes, while simultaneously maintaining the accuracy
of the STL file. It demonstrates a technique to simplify large and complex STL triangular meshes and to optimise STL shape
for rapid prototyping and manufacture. STL mesh re-triangulation can be separated into two processes, i.e., mesh deletion
and mesh rearrangement. In the mesh deletion process, two kinds of weighted-value ratio algorithms can be chosen for determining
the suitable value of STL mesh deletion. A genetic algorithm that incorporated fitness functions was used for the optimisation
of the rearranged STL meshes. Two case studies of STL mesh reconstruction, which examine the effects of the algorithms, are
presented. These studies show that optimisation of the shape of the STL file reduces its size, resulting in a reduction of
the fabrication time and improvement of the rapid prototyping process. 相似文献
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An Effective Error-Tolerance Slicing Algorithm for STL Files 总被引:4,自引:4,他引:0
S.-H. Huang L.-C. Zhang M. Han 《The International Journal of Advanced Manufacturing Technology》2002,20(5):363-367
Although the STL (stereo lithography) file format is the de facto standard for the rapid prototyping industries, there are
always some defects in STL files, many of which are difficult to correct. Instead of correcting the defects of bad STL files
by a manual, interactive and complex approach with an STL file correction program, an error-tolerance slicing algorithm for
STL files is proposed in this paper. With the detailed analysis of complex defects such as cracks and non-manifold facets,
a complete topological structure for the facets model with defects is built and the layer is sliced effectively. The badly
sliced contour is processed by crack-tracking and non-manifold facet travelling methods to obtain a correct contour in a relatively
easy 2D way. 相似文献
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Mohammad T. Hayasi Bahram Asiabanpour 《The International Journal of Advanced Manufacturing Technology》2009,45(1-2):170-180
This paper explains a new machine path generating system that its output is compatible with different rapid prototyping processes. The basis of this system is direct slicing from design-by-feature solid model. Slicing a computer-aided design (CAD) model through intersecting the model with the XY-plane at each Z increment is a well-known method of path generation. Slicing a CAD model is currently conducted through stereolithography (STL) file slicing, direct slicing, and additive direct slicing. A direct slicing approach inside a design-by-feature solid modeler is proposed. Autodesk Inventor solid modeler, as a design-by-feature solid modeler, is used for 3D solid modeling. The proposed system is implemented by Visual Basic codes inside Inventor. In this approach, first protrusion and subtractive features that form a model are extracted. Then, the intersection of each feature and the XY-plane is identified. Then, the internal and external loops are found. Depending on the specific rapid prototyping (RP) process requirements, internal or external hatch are also computed, respectively. Finally, a continuous path in required format is generated. The system reported in this paper has been successfully tested on several complex 3D models created in Inventor. The system offers customized output for different RP processes that need external or internal hatch pattern. The proposed approach for generating RP machine path through feature recognition inside design-by-feature solid modeler overcomes with the problems that are caused by imperfect STL files. Also, this system is capable of generating code compatible with major rapid prototyping processes. 相似文献
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STL模型的分层轮廓数据优化算法 总被引:3,自引:0,他引:3
在快速成形系统中 ,由于STL模型在切片后的截面轮廓数据含有大量的数据冗余点 ,严重影响了插补加工的精度和效率。为此 ,作者提出了一种数据冗余点的联合剔除算法 ,在保证加工精度的条件下 ,以进一步提高加工效率与质量 相似文献