An improved disassembly hybrid graph model for selective disassembly sequence planning

Disassembly is an inevitable step in the recovery of valuable materials from end-of-life (EoL) mobile phones. Although a Hybrid Graph is one of the prevalent method for disassembly modeling, it cannot accurately describe the subassembly disassembling process. In this paper, an improved disassembly hybrid graph model (IDHGM) for selective disassembly sequence planning is proposed for the limitations of the subassembly disassembling process of EoL mobile phones. The containment, exclusion, and subassembly are considered in view of the close connection of mobile phone parts and the occurrence of interlocking between parts. Based on the different disassembly sequences of the same part, a time cell array is used to calculate the disassembly time. The disassembly sequence is optimized by the ant colony algorithm and disassembly time is set as the optimization objective. "Honor 6" mobile phone was selected as a case study to demonstrate the feasibility of the proposed model. The results show that the disassembly sequence generated by IDHGM takes less disassembly time and can accurately describe the subassembly disassembling process.