STEP格式钣金模型特征识别

Feature Recognition for Sheet Metal Model in STEP Format

摘要: 针对STEP格式钣金模型，研究了一种特征识别方法用于提取交换格式模型中的特征信息。首先，从钣金B-rep模型中提取面、环和边等拓扑信息进行分类和组合，创建与特征有关的榫接面集、腹板面集和弯边面集。然后结合环、边信息，根据几何形状识别钣金件的基础特征、修剪特征和变形特征，判断特征间的父子关系并提取特征参数。实验表明该方法可有效识别出标准交换格式钣金模型的特征。

Abstract: Aiming at the sheet metal models in STEP format, a feature recognition method is studied to extract the model’s feature information. First, the geometrical and topological information including the face, loop and edge are gained and classified. The joggle face-sets, web face-sets and flange face-sets are created after grouping faces. By combining these face-sets with loops and edges, the base feature, trim feature and deformation feature could be recognized. After that, the feature re-lationships are judged and parameters are extracted. Experiments proved that our method is ef-fective for recognizing the features of sheet metal models in standard exchange format.