基于案例和规则的机加工艺路线规划

Machining Process Route Planning Based on Case and Rule

工艺路线是连接产品设计和制造的重要纽带,针对目前国内航空企业在工艺路线规划过程中存在的规划知识重用困难、规划效率低等问题,提出了基于案例和规则的工艺路线规划方法。构建了分层次的工艺路线案例库,通过结合Delfhi法与层次分析法来确定案例特征属性的权重,根据工艺路线规划的特点采用最近相邻法检索相似案例,提高了案例检索的效率和准确度;提出了一种工序间逻辑顺序关系规则编码算法,较好地解决了规则的表达、存储和调用问题,并将其用于约束工艺路线的规划过程,提高了案例规划过程的规范性。最后以某典型机加工艺路线为例,验证了本方法的可靠性和有效性。

Process route is an important link to connect product designing and manufacturing. Aiming at the reusing problem of planning knowledge and the low planning quality during the traditional process route planning, a method of case-based reasoning process route planning is proposed. Firstly, the hierarchical case library is adopted to represent the case. Then, the Delphi method combining with the analytic hierarchy process is used to determine the weights of the feature attributes, and a kind of nearest neighbor algorithm is proposed to retrieve similar cases according to the characters of process route planning. A new encoding algorithm of the logical relationship between two processes is proposed in order to solve the problem of rules expression, storage and invocation. Finally, the method proposed herein is verified by a case and rule based machining process route planning system.