Abstract: Based on the curvature of crosssection curves, an improved blend feature recognizing and suppressing method was proposed. Firstly, all edgeround faces and vertexblend faces in the model were recognized, and then the adjacent recognized faces were combined together as a blend feature. Secondly, all recognized blend features were suppressed as a whole. By extending the support faces of the blend feature, the point of the blendvertex and the curve of the blendedge in the suppressed model were found from the intersection between the extended faces. The topology of the original model was modified to build the suppressed model. The proposed method can recognize and suppress the blend feature with constant and variable radius of solid model with freeform surfaces, and extends the application range of current approaches. Experiments show that the proposed method is effective and feasible.

摘要： 提出了一种利用圆角面截面线曲率特性识别圆角特征的改进方法。该方法首先识别出圆角面和点过渡面，然后将相邻圆角面和点过渡面组成圆角特征，并对圆角特征中包含的所有面进行整体抑制。通过曲面延伸求交计算圆角特征抑制后新模型的点、边几何信息，并调整相应的拓扑关系重构新模型。该方法扩展了现有方法的适用范围，支持含有自由曲面的实体模型中的等半径、变半径圆角特征的识别和抑制。实验结果表明所提出的方法有效可行。

关键词: 圆角特征, 截面线, 特征识别, 特征抑制, blend feature, cross-section curve, feature recognition, feature suppression