Abstract: The disassembly analysis graph model (DAGM) is prerequisite for product disassembliability analysis. When design changes happen, the product’s DAGM has to be reconstructed. To realize the rapid reconstruction of DAGM, method of reconstruction and evolution for product disassemblable structure unit map (DSUM) is presented.There are so many kinds of connection structures that the typical connection structure is extracted from the complex mechanical products by disassembliability features to form a disassemblable structure unit (DSU). Based on the graph theory, the disassemblable structure unit graph (DSUG) is built to describe the mating contact and priority relationships among constituting components of the DSU. Furthermore, classifying and coding of connection type, composition and disassembly tool for the DSU is performed to simplify the DSUG and thus to form the DSUM. In addition, DSUM evolution methods such as inheriting, combining and deriving operation are proposed to update the DSUM during the design process. Finally, a case study on the air compressor is used to verify the feasibility of the method.

Key words: Disassemblability analysis, Disassemblable structure unit, Evolution, Green design