关键词: 夹具定位方案, 工序要求, 基准约束能力, 约束自由度, 软件设计

Abstract: To improve the quality of workpiece machining,the automated planning approach for fixture location oriented to finishing process was studied.According to th eprocess requirements and the workpiece geometrical features,the evaluation criterion of location datum was determined.Process requirements of workpiece was converted to the constrained Degrees Of Freedom (DOF) of design datum,the evaluation method of datum constraint ability was established,and the capability of constraint DOF of workpiece datum was evaluated according to the geometrical types and the types of position relationship.The combination and the replacement method of datum were constructed based on position relationship between datum.Thus the datum conflicts and the incapability of the datum locating were solved.The location quantity and the layout of the datum locating points were determined during the process of the locating ability evaluation and the locating problem resolution.The automated location planning prototype software of fixture for 3D solid model was developed by UG NX7.5 development platform and VC++ Language,and it was proved to be effective by examples.

Key words: fixture locating plan, process requirement, datum constraint capacity, constraint degree of freedom, software design