适用于并行工程的基于约束的CAPP模型

 提出一种在计算机集成环境下编制工艺现程的方法,以“约束”的概念体现工艺学原则和实际生产环境信息。零件的被加工表面信息直接从集成数据库中获取。通过工艺数据库得到各被加工表面的各种可能的加工活动信息。对以这些加工活动为元素的集合施加位置关系约束,采用一定算法得到零件的多个可行工艺规程。该ＣＡＰＰ方法可在产品设计由粗到细的各个阶段实现,适于并行工程环境。

A COMPUTER-AIDED PROCESS PLANNING METHODOLOGY FOR CONCURRENT ENGINEERING USING CONSTRAINTS

Described is a Computer- Aided Process Planning methodology for concurrent engi-neering.The methodology uses the coneept of constraints to represent manufacturing rules and status of the manufacturing environment. The information of workpiece surfaces is extracted from a common database. All the possible machining activities for each of those surfaees are identified based on the database.Feasible alternative part process plans can then be generated by means of examining the possible machining activities all together and adding position related constraints under certain procedures. The CAPP methodology can produce part proeess plans at different design stages so that it is particularly useful in a concurrent engineering environment,where various process plans may be required as a resuIt of the large number of design changes made in early design stages. In addition, the alternative process plans provided by the methodology allow further optimizations in the concurrent engineering environment for dynamic scheduling, machine capacity balancing,etc.