A Disassembly Model based on Polychromatic Sets Theory for Manufacturing Systems

Existing disassembly models are inefficient in generation of disassembly sequence and the number of disassembly schemes tends to be explosive in combination. In addition, few models have focused on three-dimension disassembly. This paper defines the concept of connectivity of part unit, proposes the generation algorithms of connective part units, and then develops a new disassembly model based on polychromatic sets theory. Adopting possible displacement model in polychromatic sets theory as disassembling model, all connective part units are sieved by possible displacement function groups to eliminate illogical ones. Hierarchical graph is employed to describe disassembly process and disassembly sequence. Present disassembly model based on polychromatic sets is convenient for expressing restriction relation between each two parts in disassembly process. It also has advantages of higher formation level, avoiding “combination explosion” and tending to program.