CAPP系统的开放式数据集成模型

OPEN STRUCTURE MODEL OF DATA INTEGRATION FOR CAPP SYSTEM

本文提出计算机辅助工艺规划CAPP（computeraidedprocessplanning）系统的开放式数据集成模型．对工艺数据进行抽象概括，形成类层次结构，提高重用．用继承机制，改善标准协议作为用户环境中资源一般的拓展协议，模式演进为补充，完成开放性描述．效率反馈和资源引用构成工艺方法、形状特征、设备资源间的联系和驱动．在工艺规划过程中瞬间返回操作产生的结果，实现相关驱动，改善系统运行效率．模型在CAPP系统中得到实践：构造数据库和知识库耦合系统；数据库面向形状特征层的工艺规划，知识库辅助完成整个工艺排序．

The paper presents a model for CAPP(computer aided process planning) sys-tem, which integrates process data together in an open structure. The model consists oftwo components. The first is to construct improved class hierarchy. According to industryclassification standards, process sources are Abstract:ed and generated to form reusable andderivable classes that describe process source by inheritance, or through schema evolution.The second is to build communications among forrn feature, process device and processmethod. The model draws an expression (F, M, S), which depicts element's reference toanother or action on others. By which, operation result is feedback in a twinkle in processplanning. To practice the model in CAPP system, both OODB and KDB are used. OODBstores dynamic data that include general process source. KDBs describe mapping rulesamong feature, device and method.