A Method of the NC Process Planning Based on the Machining Feature

In this paper,NC process planning is divided into two parts. They are the process of intelligent decisionmaking of the machining feature and the NC codes generation by variant of the machining method. The design of process steps of the machining feature are supported by the manufacturing knowledge library,characteristics-machine tool mapping library and characteristics-tool mapping database intelligently,so as to improve the level of intelligent process design. Parametric programming technique is applied to the NC code generation with the machining feature as unit. And this is conducive to the design process of automation,intelligence,modularization.