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Reheat steam turbine main valve is an important part of the protection system of the steam turbine, steam turbine shutdown protection through the closure of the main steam valve. Due to the important role of the main valve bulky, complex process, together with its shutdown protection, the main valve on-site installation time loaded successfully, otherwise, the assembly process and process information to express the repeated disassembly consumption caused by an irrational human, financial, time cost will be enormous. Therefore, the visual expression of great significance to reheat the main valve assembly process simulation and process information. The assembly process planning is an important research content in the product design, manufacturing process, improve product quality, reduce costs, shorten the production cycle of great significance. In this paper, the assembly sequence to create the main line, assembly information model, the assembly sequence generation technology, process information integration technology, and tolerance information extraction and expression technology for a more in-depth research. Mainly on the following aspects: (1) This article is more comprehensive exposition of the main content of the assembly sequence generation, basic processes and key technologies, the previous assembly information model based on the summary analysis using a tree-based graph structure model assembled Information. The combination of sub-assembly with poly family extraction and assembly hierarchy tree, assembly, association map cutset method to make a simplified assembly. (2) on the basis of the geometric model, mounting information modeling, first, in the PDM (Product Data Management) environment on the process resource, information integration, to achieve visualization of the display information such as the assembly process in the simulation assembly process When a parts assembly using the PDM database data in a virtual environment image shows related characteristics and cope with the situation, in order to provide more accurate and comprehensive information of the assembly process; Second, from the geometric model building attribute information access between different layers of mapping technology, and discusses the specific methods to achieve tolerance visualization model. (3) 600MW steam turbine reheat the main valve, for example, the application of the above method to generate the main valve sub-assembly parallel assembly sequence. Assembly simulation based on-PDMWorks the virtual assembly environment, reheat the main valve assembly, assembly process information queries, and create tolerance model, dynamic interference analysis and simulation process, to achieve an integrated assembly sequence visualization of process information, assembly precision assembly environment, to better guide the actual assembly process.
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