Multi-objective Cooperative Disassembly Sequence Planning Method For Remanufacturing

Remanufacturing services are an important way to achieve the recycling of retired product resources and the sustainable development of manufacturing.Remanufacturing disassembly service,as a prerequisite for efficient recycling and processing of retired product parts and components in the remanufacturing service,is also an important means to improve the mass disassembly efficiency and remanufacturing efficiency of large-scale waste products.During the large-scale disassembly process,there are a large number of waste products,and there is a certain difference in the structure and failure status of each waste product.Therefore,before the waste products formally enter the disassembly line,it is possible to quickly determine the disassembly target parts and disassembly sequence of each waste product,so as to effectively improve the disassembly efficiency of each waste product and realize the energy-saving and efficiency of the disassembly production line,which has become an urgent problem need to be resolved.Therefore,before the waste products formally enter the disassembly line,it is possible to quickly determine the disassembly target parts and disassembly sequence of each waste product,so as to effectively improve the disassembly efficiency of each waste product and realize the energy-saving and efficiency of the disassembly production line,which has become an urgent problem need to be resolved.In this paper,the multi-objective parts of single waste products are taken as the research object,and a disassembly sequence planning method for multi-objective parts under a three-dimensional model is proposed to provide a reference and method for the optimization of multi-objective parts disassembly of complex products.The main content of the full paper is as follows:(1)Selection of disassembly target parts.In order to fully recycle the reusable parts of used products,and save the cost and time of disassembly,the target parts are selected with priority to disassemble the parts with high residual value.Construct a remanufacturability evaluation system that covers factors such as failure probability,processability,disassembly and washability,and economics.and establish a priority disassembly level evaluation model for used product parts based on the entropy weight method and PROMETHEE ? method,and select the disassembly target part based on this model.(2)Establishing a description model of the structure of waste products.Based on the graph theory method,according to its structural function module,the waste product assembly is divided into multiple sub-assemblies,and the structure is layered according to the assembly characteristics from the inside to the outside.Based on the structural modularization and layering results of waste products,a mixed graph model of the structure of waste products is established to realize the description of the spatial constraint relationship between parts of waste products.(3)Solve the optimal disassembly sequence.Firstly,to simplify the modeling process of space constraints,improve the rapid expansion random number algorithm,and use it to detect obstacles in the three-dimensional state space of used products.Process the used products in layers,determine the constraint relationship between parts in different layers,and obtain the disassembly sequence of a single target part.Secondly,A co-evolutionary algorithm was used to coordinate the disassembly sequences of multiple single-object parts and get a sequence with a large number of coincidences in the disassembly sequences of each single-object part and the shortest length of the multi-object part disassembly sequence Then,Based on the MOD method,the standard disassembly time required for the shortest disassembly sequence is calculated.The data mining method is used to quantify the effect of the connection mode of the parts and the failure status of the parts on the actual disassembly time as a correction factor.Finally,combine the standard time and correction factor to find the effective disassembly time of the shortest disassembly sequence,select the shortest disassembly sequence that consumes the least effective disassembly time as the optimal disassembly sequence.(4)Case verification.Taking the disassembly sequence planning of waste transmission as an example,according to the failure status and remanufacturing value of its parts,the target parts to be disassembled are selected,and the effectiveness and practicability of the disassembly sequence planning method proposed in this paper is gradually verified.