基于实例的回转类零件工艺路线决策方法研究

Research on Case Based Process Sequence Planning for Rotational Parts

以回转类零件为例 ,利用基于实例的推理 (CBR)方法、专家系统方法和特征技术 ,构造了一套完整实用的基于实例的工艺路线决策方法 .构造了一种相似性系数计算公式 ,论述了新零件与实例进行比较和匹配的策略和算法 ,以及实例工艺信息筛选和实例工艺路线修正方法 .在实例抽取过程中 ,新零件与实例的匹配信息被详细记录下来 ,使得以实例抽取为基础的实例工艺信息筛选和实例工艺路线修正算法变得相对简单并易于实现 .

Process sequence planning is the main task of computer aided process planning (CAPP). Taking the rotational parts as an example, an approach of case based process sequence planning by merging together the feature technology, case based reasoning and expert system approaches is presented. Formulas are constructed to calculate the similarity coefficients of a new part with respect to the sample cases. Strategies and algorithms are worked out to retrieve and match the most promising candidate cases and carry out the necessary modification of the relevant process sequences. The detailed matching information between the new parts and the cases are carefully recorded witch makes the case searching and modification easy to realize. The method has been successfully used in an applied CAPP system for rotational parts.