产品MBD数据集三维标注中工艺面的形成与校验

由于造型原理、方法等原因,三维模型中的面往往不具有明确的工程语义,使三维模型上标注工程尺寸等信息易产生歧义,目前商用CAD软件没有很好地解决该问题.基于OpenCASCADE几何造型内核研究了解决该问题的方法,提出造型面和工艺面的概念,通过对造型面的数学属性识别,结合机械工程中工程语义,将造型面进行绑定,形成符合工程语义的工艺面,把模型三维标注信息作为工艺面的属性,增加了系统三维尺寸标注的智能性,也为后续的产品虚拟装配、加工制造以及产品服役中语义信息的自动提取提供可能.

Formation and verification of process surface in annotation of product MBD data set

Because of the principle and method of modeling, the surface in the 3D model often does not have a clear engineering semantics, which may produce ambiguity in tagging the dimension and other information on the 3D model of the project. This problem is not well solved by commercial CAD software. Based on OpenCASCADE 3D modeling kernel, this paper studies the methods to solve the above problems, and puts forward the concepts of modeling surface and process surface. By recognizing the mathematical attributes of the modeling surface and combining the engineering semantics in mechanical engineering, the modeling surface is bound to form a process surface that conforms to the engineering semantics. The information of 3D annotation information of the model is regarded as the attribute of the process surface, which increases the intelligence of the system's 3D dimensioning, and also makes it possible to extract the product semantics information automatically in subsequent product virtual assembly, processing and manufacturing as well as in product service.