Research On Decision-making Of Selective Disassembly Scheme For Used Products Based On Correction Of Damaged Information

Remanufacturing is an important way to realize the efficient utilization of resources.Disassembly is the first step in the separation and classification of used parts,and is the premise of obtaining high quality blanks that need to be remanufactured.A better disassembly scheme is an essential condition to ensure that high-value parts continue to perform their functions.In this paper,based on the analysis of common damage forms of parts,a damage information model is established to make necessary corrections to each element in the disassembly process,and the quantification method of potential value of used parts is studied.Based on the disassembly process elements and parts value,the design and evaluation method of selective disassembly scheme was studied to improve the accuracy and efficiency of judging and extracting high-value parts in products,and to reduce the waste of resources.The main contents of the dissertation are as follows:(1)According to the impact of damage form on the disassembly difficulty of parts mating surface,some disassembly process elements are graded and modified,such as disassembly tools,disassembly direction,contact constraints and priority constraints.The basic disassembly information modification model of used products is proposed to guide the disassembly process.(2)The modification method of disassembly time element was studied.Considering the influence of damage on bonding force between mating surfaces,a disassembly time calculation method for damaged interference fitting was proposed.The basic disassembly time was modified,and the validity was verified by taking worn journal as an example.According to the coordinate variation of each part when it is removed from the product in sequence,a calculation method of direction change time considering the consumption of disassembly tool angle transformation is proposed to modify the auxiliary disassembly time,and the human-computer interaction tool is designed by using secondary development technology,the effectiveness is verified by taking the reducer as an example.As the calculation basis of disassembly cost.The damage information model is formed together with basic disassembly information model.(3)Combined with the damage information model and according to the influence of contact constraints on the topological layer and attribute layer indexes of parts,a comprehensive evaluation model of parts value considering the functionality and remaining service time was proposed to express the potential availability.And serve for the selection of disassembly target parts and the decision of parts recovery.(4)Aiming at the problems of unreasonable distribution of recycling parts and unscientific product disassembly scheme,the value of each part was sorted according to the comprehensive evaluation model of parts value,and a dynamic selection method of disassembly target parts was proposed,and the recycling direction of parts was dynamically allocated.Considering the value of parts and the cost of disassembly process,taking the economy of disassembly process as the optimization objective,the formulation rules of multi-objective disassembly scheme were designed,and the optimal disassembly sequence and disassembly depth of products were obtained by combining the adaptive genetic algorithm.The scientific nature of the proposed method was verified by taking the used engine as an example.