Multilevel structured NC machining process model based on dynamic machining feature for process reuse

Towards the fourth industrial revolution or Industry 4.0 with intelligence as the soul, and data as the key, product manufacturing is facing new challenges in the ever-changing dynamic and competitive environment, and process data-driven intelligent NC machining process planning has become an enabling technology for high efficiency and quality manufacturing. However, existing methods are mainly based on static machining feature for the description of the process data, and they are difficult to represent the embedded multi-granularity process knowledge and experience of designers. In this paper, a multilevel structured NC machining process model based on dynamic machining feature for process reuse is proposed. First, the dynamic machining feature is introduced to make up the deficiency of process design intent capture based on static machining feature. Then, the interactions between 3D CAD model and CAM model are revealed to realize the association in the process data. Finally, the multilevel structured NC machining process model embodying multi-granularity process design intent is established to overcome the sematic gap between high-level macro-technological process and low-level micro-process parameters. A prototype system based on UG NX has been developed to verify the effectiveness of the proposed approach.