In the framework of an intelligent assembly information system, the three-dimensional?model of a product serves as a critical information source for the system, which also provides initial product feature information for assembly sequence planning. At present, in the process of extracting information from the STEP neutral file, the products are rarely performed at the assembly level. In addition, the characteristic of semantic expression of the same parts included in a product is always ignored. In this paper, based on the theory of ontology, the OntoSTEP model is constructed to extract information from STEP neutral files at the assembly level. A set of extraction rules for the basic corresponding information of the same parts in the assembly are developed. Further, a SWRL rule library is established in Protégé to realize the comprehensive information extraction of the assembly hierarchy for a product from its 3D model, which lays the foundation for the assembly sequence planning.
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