Abstract: Aiming at the setup planning problem in parts process planning, a heuristic clustering setup planning solving method oriented to STEP-NC machining feature was proposed. Based on the analysis of STEP-NC data model and machining unit, a mathematical model for setup planning was established. The machining unit was clustered by using manufacturing priority rules of machining features, and the setup scheme set was formed. Through expert estimation and evaluating scheme, these setup scheme sets were ordered. Thus the setup planning scheme that accord with parts setup demand was generated. The concrete shape and stability of parts were considered and each unit's locating surface as well as clamping surface were determined. Based on Solidworks 3D computer aided design platform, the generation of parts setup planning was realized. The proposed algorithm was verified by examples.

Key words: STEP-NC, computer aided process planning, machining features, heuristic algorithms, setup planning

摘要： 针对零件工艺规划过程中的装夹规划问题，提出一种面向STEP-NC加工特征的启发式聚类装夹规划求解方法。在分析STEP-NC数据模型和加工单元的基础上，建立了零件装夹规划的数学模型，基于加工特征制造优先级规则对加工单元进行聚类分组，形成零件的装夹方案集；随后通过专家打分和评定策略对这些装夹方案集进行排序，生成符合零件装夹要求的装夹规划方案。装夹规划考虑了零件的具体形状及其稳定性等多种约束条件，确定零件每一个加工单元的定位面和装夹面，较好地体现了零件实际加工过程中的装夹情况。基于Solidworks三维计算机辅助设计平台实现了零件装夹规划的生成，通过实例对所提算法进行了验证。

关键词: STEP-NC, 计算机辅助工艺规划, 加工特征, 启发式算法