Modeling And Application Of Product Information For The Networked Manufacturing Platform

As a natural result of economic globalization and information revolution, the networked manufacturing (NM) technology is a general concept about all kinds of theories and techniques. It based on network technology and manufacturing technology, especially advanced manufacturing technology. The NM platform provides an environment for applications such as inter-enterprise information sharing and collaborative work.Based on analysis of domestic and international researching achievements, some key technical issues for the service oriented NM platform are mainly researched and explored. The main research content and achievements are as follows.1. A product model system for NM platform is researched and set up based on the standard for the exchange of product model data (STEP). According to the characteristic of 3D part models in network conditions, the dissertation builds the model system based on the standard for STEP, analyses all kinds of sub-models in the system from the perspective of the actual requests in different stages of product life-cycle, and studies the techniques and implementation methods which convert the STEP format files to application sub-models.2. A network transmission method of 3D visual model is researched and proposed, which is an incremental method based on stream transmission in order to implement real-time sharing of network collaborative design. Using stream media technology, this method compares modified model file with original file and just transports the modified file blocks. Examples show that this method can greatly reduce data redundancy and improve transmission efficiency.3. A 3D model feature retrieving and matching method based on maximal cliques is researched and proposed. In order to retrieve 3D models rapidly and accurately, the method uses graph theory algorithms and combinatorial optimization techniques, reduces complex attributed adjacency graph to relatively simple combination graph, and applies simulated annealing algorithm to acquiring the similarity value of different part models. It not only greatly improves calculating efficiency, but also possesses better engineering practicability. 4. An intelligent decision-making model construction method based on product life cycle is researched under distributed collaborative manufacturing environment. With the expertise or analyzing historical case analysis, the decisive factors in the product life cycle are extracted. On this basis, a hierarchy model about these factors is established. The weight values of the single ability and comprehensive ability of different candidate partners are calculated and shown in a table. Accordingly enterprises can perform distributed collaborative manufacturing efficiently for their needs with the advantages of one or more candidates.A prototype system is designed and developed with the technique of service oriented architecture based on the above mentioned researches and a project about trading and exhibition networked platform of CNC machine tools and supporting parts in Kunshan CNC Zone.