【作者】 杨菁；

【导师】 王军；

【作者基本信息】 燕山大学 ， 机械制造及其自动化， 2004， 硕士

【摘要】 CAPP的智能化是CAPP发展的重要方向，它根据各种工艺决策逻辑和知识库自动设计出零件的工艺规程，并实现与CAD、CAM系统的集成。因而工艺决策方法以及各种知识库和数据库的建立也成为智能CAPP的关键问题。本文在综合分析了零件设计与制造过程中各种信息的相互关联性，基于特征建模方法的原理，提出了过程特征的概念，给出了过程特征的定义，意义，并采用面向对象方法建立了基于过程特征的零件信息模型。不仅为CAPP提供零件信息模型，也为面向制造的设计系统开发提供技术支持。本文通过定义的过程特征，不仅描述零件的信息模型，同时建立过程特征与加工方法、采用的刀具，以及刀具与机床间的联系，建立了面向对象的数据模型，从而构造统一的数据库。在上述分析的基础上，利用面向对象模型向关系数据库的映射规则，开发了零件信息、机床、刀具和工艺数据库的原型系统，通过测试验证了过程特征概念在CAPP系统中不仅有助于建立各种数据库，知识库的有机联系，便于知识的使用，同时也便于工艺方法的推理，为智能化CAPP、CAD/CAPP集成系统以及面向制造的设计系统等开发和应用提供了技术支持。更多还原

【Abstract】 The Integration of CAPP with intelligence is one of the most important trends of CAPP. Based on some decision-making logics and knowledge databases, an intelligent CAPP creates the process for parts automatically and realizes the integration of CAD and CAM systems. According to this, the construction of the process decision-making logics and knowledge databases are the two most important parts of intelligent CAPP.With synthesis analysis of the relationship of the information in both product design and manufacturing process, and on basis of the basic theory of feature modeling, a new concept-transition feature is presented and defined in this thesis. With the O-O method a product model is constructed based on the transition features, and the model provides not only product model for the CAPP, but also the technical support for the development of DFM system.The transition features are used to describe the product model and the relationship with manufacturing process, relationship with cutter, relationship with machine tools and cutters, an O-O data model is constructed in order that a united database is formed.Based on the analysis above and the correspondence rules between O-O model and relational database, a prototype is developed which consists of product design, machine tools, cutter and process databases. The prototype shows that the concept of transition is proved to be helpful to the relationship establishment of various databases and knowledge base, and the use of knowledge and the decision-making of the process. All of these are helpful to the construction of intelligent CAPP and CAD/CAPP integrated system, and the development and application of DFM.更多还原