Base on the above work , again developing feature library serving the reducer box parts on the p1atform autocad which is used wdely by people , utilizing the developing tools objectarx and aatocad system which operates the entity in model to frame the 3d feature modeling system . during design a regular box parts , appending the manufacture and process information illto feature in company with modeling the products shape . it is commonly practical idea that operating feature instead of operating parts entity and local parts make products " information sttuctufe mect the requiremeni of essential information that the capp system need 本文以目前广泛使用的autocadr14为二次开发平台，利用objectarx开发系统和alltocad支撑平台对体素的各种操作功能，在实体造型的基础上创建产品的形状特征库，开发应用实例规则箱体三维特征造型cad系统，并在产品的设计阶段，在完成产品的形状设计的同时也完成产品的特征信息的附加工作，以特征操作取代传统的基本体素的集合运算及局部操作，使对产品的信息描述能满足capp系统的信息要求，具有一定的实用价值。
In the research task supported by the key technologies r & d program in the 9th five - year plan of jiangsu province , the study focuses on the nc milling programming software development method and the corresponding algorithms on the basis of acis . by using the development interfaces provided by acis , the author has made some innovation to tool path generation algorithms . based on acis , a new set operation method of loops is presented in this paper 借助acis提供的开发接口实现对一些刀具轨迹生成算法的创新：提出了一种基于acis的环集合运算方法，该算法充分利用了acis的功能，使算法实现过程大大简化，并提高了算法效率；设计了一种加工区域识别算法，该算法可以识别出由存在复杂嵌套关系的多个型腔环和岛屿环组成的零件几何模型中的待加工区域；提出了一种实体精加工刀具轨迹生成算法，该算法可以自动计算出待加工零件在一个加工方向上所有的刀具轨迹，从而在某些情况下，大大方便数控编程人员完成nc代码的生成。
