Abstract
Aiming at the problems of low assembly knowledge shareability and reusability as well as long generation cycle of assembly process, this paper proposes an ontology-based assembly knowledge representation method, and generates assembly process file based on this method. The assembly ontology, modelling through protégé software, has three central classes: AssemblyObject, AssemblyElement, and AssemblyTool. The assembly ontology is described in OWL language and the assembly knowledge concepts including classes and individuals are linked through properties. In addition, the assembly ontology in OWL language is parsed through Python's RDFLib library, and it is called and displayed in LabVIEW. Finally, the assembly process file containing assembly sequence and assembly process parameters is generated. This method realizes the formal description of assembly process knowledge at the semantic level and improves the shareability and reusability of assembly knowledge. Besides, the corresponding assembly process knowledge can be quickly queried and obtained through this method, improving the efficiency of assembly process planning, and providing intelligent assembly basic knowledge.
Highlights
With the vigorous development of Industry 4.0 in Germany, Made in China 2025, and the Internet industry in the United States, intelligent manufacturing and intelligent assembly have attracted more and more attention
Aiming at the problems of low shareability and reusability of assembly knowledge and long assembly process generation cycle, this paper proposes an ontology-based assembly knowledge representation method, and generates assembly process file based on this method
The assembly ontology is described in OWL language and modelled by Protégé software, and has three central classes: AssemblyObjects, AssemblyElement, and AssemblyTool
Summary
With the vigorous development of Industry 4.0 in Germany, Made in China 2025, and the Internet industry in the United States, intelligent manufacturing and intelligent assembly have attracted more and more attention. The research on modelling assembly knowledge using semantic ontology has attracted more and more attention. K young-Yun Kim [2,3] of Wayne State University in the United States proposed an ontology-based assembly design framework, which includes variable conceptual entities such as products, assemblies, assembly components, parts, sub-assemblies, assembly features, connection structures, connection characteristics and so on. The assembly ontology is used to realize assembly design, information sharing and virtual assembly simulation. Lihong Qiao of Beihang University [4] proposes a geometry-enhanced assembly process ontology model, using semantic ontology technology to establish the description method, data structure and relationship description of product geometric information in the assembly process; an assembly process decision-making framework based on geometry-enhanced assembly process ontology is established. RAPHAEL establishes an ontology program that expresses the geometry of the assembly, and maps the geometric neutral file STEP AP203 with the ontology model to realize the information conversion between the geometric information of the 3D model and the semantic model [5]
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