Modelling of shaft part information based on domain ontology

For the parts information describing in decision-making process of CAPP system, with the concept of domain ontology, part information model, which includes four information layer(parts layer, feature layer, topology layer and process layer), has been established, a hierarchical description of process information has been achieved while build a domain ontology model of shaft parts by using the protégé, a ontology editing software. using a stepped shaft part as example illustrate the information indicating of the part information model in order to verify the feasibility of the model has been created, it has laid a good foundation to build process knowledge database for the CAPP system.