基于中面的注塑产品特征识别

摒弃传统的基于实体模型的特征识别方法，提出基于中面模型的方法。首先提出了适合于中面模型的表达方法：面－边属性图和面－边属性矩阵；然后针对注塑产品的特点，对特征进行了分类，将其分为面特征、连接特征和加强特征；最后对中面模型的中面、边环和边的几何拓扑特征进行了分析，分别研究了基于中面的特征识别算法，给出了算法实现方法和实例。

Method for Determining Parameters of Springback Based on Characteristic Sections

Some deficiencies were analyzed for current design change management of conceptual design. This paper proposed a solution for conceptual design change management,where the document relationships combined with configuration management.It aimed at the structure and composition uncertainty of conceptual design in product design chain. On the basis of analyzing existing conceptual design procedures, the conceptual design flow of product design chain was constructed. In conceptual design phase, the document relationships were defined and formally described, a design change control processing was proposed based on configuration management for conceptual design of product design chain. The concept of document matrix tree was proposed originally, and the method can overcome insufficiency which the pattern of design change management based on document cannot determine the change of proliferation scope. This paper achieves the integrity, consistency and effectiveness of document relationship information among the partners of design chain.