• Title, Summary, Keyword: Disassembly

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Method for Generating Optimal Disassembly Sequence of End-of-Life Car′s Parts (폐자동차 부품의 최적 분리순서 생성을 위한 방법론)

  • 박홍석;최홍원;목학수;문광섭;성재현
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.9
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    • pp.188-196
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    • 2003
  • In order to increase competitiveness and to gain economic benefit, companies ask more and more how to recycle their products in a efficient way. So far, to answer this question, companies are not sufficiently supported by suitable methods specially in the area of disassembly process planning. For this reason, we develop in collaboration with an industrial partner a new method for generating an optimal disassembly sequence. In the presented paper this method will be described in detail by considering the exiting assembly information, disassembly method and disassembly depth. PLM (Profit-Loss Margin) curve that is used to determine disassembly depth consists of profit value, disassembly cost and disassembly effect. Using assessment parameters, generated alternative disassembly sequences are evaluated and optimal disassembly sequence is proposed. This method is applied to generate the optimal disassembly sequence of Door Trim as an example.

Disassembly Process Planning of End-of-Life Car

  • Park, Hong-Seok;Choi, Hung-Won
    • International Journal of Precision Engineering and Manufacturing
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    • v.6 no.1
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    • pp.42-50
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    • 2005
  • In order to increase competitiveness and to gain economic benefit, companies ask more and more how to recycle their products in an efficient way. So far, to answer this question, companies are not sufficiently supported by suitable methods specially in the area of disassembly process planning. For this reason, we develop in collaboration with an industrial partner a new method for generating an optimal disassembly sequence. In this paper this method will be described in detail by considering the exiting assembly information, disassembly method and disassembly depth. PLM(Profit-Loss Margin) curve that is used to determine disassembly depth consists of profit value, disassembly cost and disassembly effect. Using assessment parameters, generated alternative disassembly sequences are evaluated and an optimal disassembly sequence is proposed. This method is applied to generate the optimal disassembly sequence of Door Trim as an example.

A PROMETHEE Method Based Heuristic for Disassembly Line Balancing Problem

  • Avikal, Shwetank;Mishra, P.K.;Jain, Rajeev;Yadav, H.C.
    • Industrial Engineering and Management Systems
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    • v.12 no.3
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    • pp.254-263
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    • 2013
  • Disassembly of discarded products takes place in the process of remanufacturing, recycling, and disposal. The disassembly lines have been taken as available choice for automated disassembly; therefore, it has become essential that it be designed and balanced to work efficiently. The multi-objective disassembly line balancing problem seeks to find a disassembly sequence which provides a feasible disassembly sequence, minimizes the number of workstations and idle time, and balances the line for the disassembly of post consumed product by considering the environment effects. This paper proposes a multi-criteria decision making technique based heuristic for assigning the disassembly tasks to the workstations. In the proposed heuristic, the PROMETHEE method is used for prioritizing the tasks to be assigned. The tasks are assigned to the disassembly workstations according to their priority rank and precedence relations. The proposed heuristic is illustrated with an example, and the results show that substantial improvement in the performance is achieved compared with other heuristics.

A Petri Net based Disassembly Sequence Planning Model with Precedence Operations (분해우선작업을 가지는 페트리 넷 기반의 분해순서계획모델)

  • Seo, Kwang-Kyu
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.5
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    • pp.1392-1398
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    • 2008
  • This paper presents a Petri Net (PN) based disassembly sequence planning model with precedence operations. All feasible disassembly sequences are generated by a disassembly tree and a disassembly sequence is determined using the disassembly precedence and disassembly value matrix, The precedence of disassembly operations is determined through a disassembly tree and the value of disassembly is induced by economic analysis in the end-of-life phase. To solve the disassembly sequence planning model with precedence operations, a heuristic algorithm based on PNs is developed. The developed algorithm generates and searches a partial reachability graph to arrive at an optimal or near-optimal disassembly sequence based on the firing sequence of transitions of the PN model. A refrigerator is shown as an example to demonstrate the effectiveness of proposed model.

A Study on Disassembly Path Generation Using Petri Net (페트리네트를 이용한 분해경로 생성에 관한 연구)

  • 이화조;주해호;경기현
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.2
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    • pp.176-184
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    • 2000
  • Possible representation methods for the product structure have been compared and analyzed to determine optimal disassembly path of a product. Petri net is selected as the most optimal method to represent disassembly path of the product. In this method, a reachability tree for the product is generated and disassembly time for each path is calculated. A path with the smallest disassembly time is selected as the optimal path. A software far DPN(Disassembly Petri Net) has been developed and applied to search the optimal disassembly path for a ballpoint pen disassembly process as an example.

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Redesign for Ease of Assembly and Disassembly in Computer case (조립 및 분리용이성을 고려한 컴퓨터 케이스 재설계)

  • 이정우;김인호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.344-347
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    • 2000
  • In this paper, a redesign of computer case is proposed by applying some guide lines of assembly and disassembly to an existing computer case. Some problems such as increase of number of disassembly and vibration, difficult assembly and disassembly from unfittable covers are recognized through analysis of geometrical structure and practical assembly and disassembly. A solution of these problems is proposed through ideas of ease of assembly and disassembly. Design for Environment Software is used to evaluate both redesigned and existing products. Time of assembly and disassembly and MET-point are especially calculated by the software, and these data give us a good guide for analysis of ease of assembly, ease of disassembly and environmental influence in both products.

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Virtual Disassembly

  • Mo, Jianzhong;Zhang, Qiong;Gadh, Rajit
    • International Journal of CAD/CAM
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    • v.2 no.1
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    • pp.29-37
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    • 2002
  • De-manufacturing is an entire process of collecting, disassembling, reusing, refurbishing, recycling, and/or disposing products that are obsolete or un-repairable. Designing the products for inexpensive and efficient disassembly enhances the ease of de-manufacturing. Virtual disassembly addresses the difficulty and the methods to disassemble a product in design stage rather than really disassemble a product at the end of its life cycle. Based on the virtual disassembly analysis results, design will be improved for better assembling/disassembling. This paper presents a systematic virtual disassembly methodology such as disassembly relation modeling, path/sequence automatic generation and evaluation. This paper also presents a new virtual disassembly interface paradigm via virtual reality technology for disassembly simulation in virtual environment.

Methodology for Estimation of Disassembly Time and Evaluation of Disassemblability Considering Recycling (재활용을 고려한 분리시간 산정 및 분리용이성 평가 방법론)

  • Mok, Hak-Soo;Cho, Jong-Rae;Jung, Yoong-Ho;Kang, Young-Hun
    • IE interfaces
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    • v.15 no.3
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    • pp.297-307
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    • 2002
  • Since the pressure for recycling has been increasing, the disassembly, which is pre-process of recycling, has been becoming very important process. The goal of disassembly for recycling is to separate different materials to the greatest extent with least effort. DFD (Design for Disassembly) is a design philosophy for improving product designs for simpler or less costly disassembly operations. This paper proposes a new DFD methodology that can estimate the standard disassembly time and evaluate the disassemblablity of parts. We select some determining and influencing factors related with disassembly process, and estimate the assembly time using motion analysis. By the levels of the determining and influencing factors, the disassemblability is evaluated, and finally, the tables that include the time and score of disassembly are suggested.

A Study on Deciding Priority of Optimal Design Guide for Disassembly Process (분리공정 개선을 위한 설계 가이드 우선순위 결정방법론)

  • Mok, Hak-Soo;Lee, Jae-Sung;Cho, Jong-Rae
    • IE interfaces
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    • v.17 no.4
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    • pp.414-425
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    • 2004
  • This study presents the decision of priority for optimal design guide to improve disassembly process. Disassembly process is divided into recognition, transfer and disassembly of assembly point and recognition, transfer and remove of grasp point. Significant influential factors are derived from analyzing the above process. And those factors are used for making the check list to evaluate the properties of parts in each process. Furthermore, the weight with considering disassembly process is also used to determine weight of each process. On the base of the above sequence, qualitative score of disassemblability of each process that is enabled to compare different disassembly processes can be acquired. Ultimately the score helps to decide the priority of design guide for disassembly process.

Development of Lifter for ELV Disassembly (폐자동차 해체용 Lifter의 개발)

  • 이현용;송준엽;강재훈
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.856-859
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    • 2003
  • Currently, the domestic recycle rate of ELV parts is about 3%. The reason of the row rate of it is due to that consumer can not obtain the needed ELV parts. In order to supply the good parts to consumer. the equipment of the ELV disassembly is required. This research is to developed the lifter for ELV disassembly by considering the references such as the disassembly tool and equipment of the domestic and foreign ELV disassembly company.

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