• 한국자동차공학회논문집
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• 제16권6호
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• pp.48-57
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• 2008

This paper shows the procedure to decide an optimal design principle for improving the disassemblability with considering of disassembly conditions. On the bssis of the disassembly mechanism of products and the structure of parts and subassembly, the disassemblability is classified into four categories: graspability, accessibility, transmission of disassembly power and handling. The weighting values of the influential factors are calculated by the method of AHP(Analytic Hierarchy Process). The disassemblability is evaluated quantitatively. We established some score tables for the evaluation. Using these score tables, several principles for higher disassemblability in accordance with work conditions can be decided. An optimal design principle can be found by the comparison with the total scores of some disassembly conditions.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 19-21 Oct. 1992
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• pp.507-512
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• 1992

This paper presents a method for the automatic generation of assembly sequences based on the recursive extraction of a preferred part along with the verification of its disassemblability. To verify the disassemblability of the part we inference the geometric precedence constraints using a method of extracting separable directions for the part and determine the disassemblability cost by the separability and stability cost. The proosed method provides a local optimal solution of finding a cost effective assembly plan, and the feasibility of calculating robot motion programs by evaluating separable directions in flexible manufacturing application. A case study is given to illustrate the concepts and procedure of the proposed scheme.

• 한국정밀공학회지
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• 제24권7호
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• pp.39-48
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• 2007

This paper presents a method of a line balanced assembly sequence generation based on the verification of a disassemblability and a work time. To derive the disassemblability for a part to be disassembled, first we inference collision free assembly directions by extracting separable directions fur the part. And we determine the disassemblability defined by the separability and stability cost. The separability cost represents a facility of the part disassembly operation, and the stability cost which represents a degree of the stability for the base assembly motion. Based upon the results, we propose a new approach of evaluating work time using neural networks. The proposed assembly sequence generation provides an effective means of solving the line balancing problem and gives a design guidance of planning assembly lay-out in flexible manufacturing application. Example study is given to illustrate the concepts and procedure of the proposed schemes.

• 한국정밀공학회지
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• 제14권1호
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• pp.23-32
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• 1997

In this paper, systematic approach is studied about assemblability and disassemblability of parts in order to reduce the assembly cost, and to disassemble products easily which is possible to recycle the parts. For this purpose, we selected one subassembly, and analysed assembly and disassembly process. From this result, we found the weakpoints of assembly and disassembly process, and then, the influencing parameters of assemblability and disassemblability are defined. On the basis of the analysis of these parameters we grasped the interrelation between assemblability and disassemblability. And, guidelines for assemblability and disassemblability are developed. Finally design alternatives are evaluated quantitatively in the aspects of assembly and disassembly by using the guidelines which developed in this research.

• 청정기술
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• 제13권2호
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• pp.134-142
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• 2007

본 연구에서는 재제조를 용이하게 하기 위하여 분해용이성 및 분해시간 산출이라는 두 가지 방법을 이용하여 부품의 분해성 평가 방법을 제시하였다. 또한 부품별 평가로부터 얻어진 분해성 지수로부터 최소 부품수의 개념을 이용하여 제품의 분해성을 도출하는 방법을 개발하였다. 제시된 방법들을 컴퓨터의 외장 케이스에 적용하여 비교 분석하였다. 분해용이성 및 분해시간의 분석에 의한 분해성 평가는 케이스의 일부 분리를 용이하게 한 새 모델이 재제조를 위한 전체 분해시에는 오히려 분해성이 악화된다는 동일한 결론을 보여주었다. 이러한 분해성 평가 방법은 제품의 재제조 및 재활용 특성을 평가하는데 중요한 지표중의 하나로 사용될 수 있을 것이다.

• 한국정밀공학회지
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• 제16권8호
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• pp.88-99
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• 1999

In this paper, a disassemblability evaluation has been investigated quantitatively by using an ease-of-disassembly design method. Four categories such as recognizability, approachability, separability, and treatability have been analyzed in details. A simulation software for estimating the ease-of-disassembly design method has been developed and applied to door trim and spin basket respectively as an example.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2002년도 춘계공동학술대회
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• pp.608-615
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• 2002

In recent years, Pressure to recycle has stemmed from environmental and economic reasons. This paper examines a new methodology that can estimate the disassemblability considering the recycling. Easy of disassembly estimation method outlined here is shown to provide one of several needed metrics for use during product design. This study suggests five main determining factors-fixing, grasping, access, disassembly and handling-as the five determining factors and determined to evaluate disassemblability. The evaluation based on disassemblability is demonstrated on an automobile parts example.

• 대한산업공학회지
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• 제33권3호
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• pp.355-363
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• 2007

This paper presents a method of an automatic work time evaluation based on the verification of a disassemblability and assembly configuration. Even though a work time evaluation is an important field of concern for planning assembly lay-out, there are some limitations using cumbersome user query or approximated work time data without considering assembly condition. To overcome such restriction, this paper presents a method to mathematically verify assembly conditions based on the disassemblability, which is defined by the separability and stability cost. The separability cost represents a facility of the part disassembly operation, and the stability cost which represents a degree of the stability for the base assembly motion. Based upon the results, we propose a new approach of evaluating work time using neural networks. The proposed method provides an effective means of solving the work time evaluation problem and gives a design guidance of planning assembly lay-out in flexible manufacturing application. Example study is given to illustrate the concepts and procedure of the proposed schemes.

• 한국정밀공학회지
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• 제24권8호통권197호
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• pp.58-66
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• 2007

In order to improve the recyclability and to reduce the recycling cost and time, the disassembly technology should be systemized because the worn out products can be reused or recycled after disassembly processes. This paper attempts to propose the integrated CATIA-based DfD (Design for Disassembly) support system to promote the disassemblability of products. The system is composed of two modules; evaluation of disassemblability, generation of DfD alternatives. The disassemblability of current vehicle is evaluated to identify the weak point in terms of disassembly using the DELMIA and developed evaluation system. Furthermore a new expert system is developed to propose the optimal redesign rule and principle for generating the DfD alternatives. In order to generate the DfD alternatives, a CATIA-based design support system is implemented. The system can provide quick results and ensure consistency and completeness of the redesign alternatives.

• 산업공학
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• 제15권3호
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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.