【作者】 周满元；

【Author】 Zhou Manyuan Xi Juntong Department of Computer Science, Guilin University of Electronic Technology, Guangxi 541004

【机构】 桂林电子工业学院计算机系；

【摘要】 直接分层可以得到精确的层片轮廓,避免了STL文件的种种缺点以及STL文件的错误诊断与修复过程。现有的直接分层方法大多是基于某一特定的CAD系统进行二次开发,本文提出一种基于STEP的CAD模型直接分层方法,CAD系统与快速成型系统之间以STEP中性文件格式进行CAD数据交换。系统首先读取由CAD系统输出的STEP中性文件,然后提取其几何拓扑信息并进行计算机内部几何模型的重建。用户选择零件的制作方向并指定分层厚度以后,系统自动对CAD.模型进行直接分层,分层结果以SSL文件格式输出并可以直接送到各种快速成型系统进行加工。基于STEP的CAD模型直接分层独立于CAD系统,不仅灵活性、可扩展性好,而且STEP模型的数据量大大小于STL模型,有利于网络化制造环境下的文件传输与交换。更多还原

【Abstract】 Direct slicing generates precise contours for each layer directly from CAD model and avoids all kinds of disadvantages of STL file. In this paper, a STEP-based approach of direct slicing independent of CAD system for rapid prototyping is presented. First, the CAD model is imported into our slicing system from CAD system by the STEP standard format. Then the user is prompted to orient the part and specify the layer thickness for it. The sliced contours are exported by SSL file format and can be sent to rapid prototyping machines directly for fabrication. Not only the STEP-based direct slicing is more flexible and does not rely on any specific CAD systems, but also the STEP files are greatly smaller than STL files and are propitious to the data exchange in the distributed design and manufacturing. Implementation details and results are presented.更多还原