【摘要】 首先分析了采用面向对象技术表示特征的原因及其优点，提出了面向对象技术表示特征的概念模式；其次分析了在特征的面向对象表示中如何表示边界条件和外载荷这两个重要因素，提出了特征类的关联概念。最后以冲压产品为例，具体说明了特征的面向对象表示方法，同时根据冲压领域的具体情况，提出了由形状特征推导边界条件和外载荷的方法。更多还原

【Abstract】 Firstly, this paper analyzes the reasons why the object oriented technology is suitable for expressing features and proposes the concept model of the object orineted feature method. Then, the method of expressing boundary conditions and loads in the feature class construction is discussed and the relation concept of feature calsses is presented. Finally, the object oriented method of features is illustrated with the press products used as examples and a new method is put forward that boundary conditions and loads are inferred by form features.更多还原