Abstract: In the light of the limitation of traditional disassembly modeling methods for complex product, a novel disassembly modeling method for design for disassembly (DFD) based on connector structure units is presented. The parts combination connected by physical, chemical or mechanical method is defined as connection structure unit. Thus, the product is mapped into the organic combination of connection structure units. The disassembly precedence rules are extracted by analyzing the disassembly knowledge and experience of connection structure units. In addition, the extension matter-element model of connection structure unit is constructed to describe its disassembly knowledge. To describe the assembly constraints and disassembly precedence between components of product, the disassembly multi-constrained graph model (DMCGM) is defined. The DMCGM is deduced fast based on reuse of connection structure units, which could eliminate uncommon or unrealistic solutions for subsequent disassembly sequence planning. A mould clamping device of injection molding machine case study proves the validity and feasibility of the proposed method.

Key words: disassembly model;design for disassembly(DFD);connector structure unit;matter-element