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Research Papers

Graph Based Method and Tool for Complete and Selective Disassembly Time Estimation in Early Design

[+] Author and Article Information
Yang Hu, Raghunathan Srinivasan

School of Mechanical and Materials Engineering,
Washington State University,
Pullman WA 99164-2920

Jessica Spoll

Schreyer Honors College,
Penn State University,
217 Hamilton Hall,
University Park, PA 16802

Gaurav Ameta

School of Mechanical and Materials Engineering,
Washington State University,
Pullman, WA 99164-2920

Joshua Meyer, while at Washington State University, helped create the CAD model for Eco-Toaster

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING. Manuscript received October 27, 2014; final manuscript received January 23, 2015; published online April 9, 2015. Assoc. Editor: Joshua D. Summers.

J. Comput. Inf. Sci. Eng 15(3), 031005 (Sep 01, 2015) (10 pages) Paper No: JCISE-14-1345; doi: 10.1115/1.4029752 History: Received October 27, 2014; Revised January 23, 2015; Online April 09, 2015

The goal of this research is to develop a method and tool (a) to estimate disassembly time automatically from early embodiment design based CAD model and (b) to provide design suggestions to improve product disassemblability. Disassembly is a critical process in the end-of-life (EOL) stage of a product. It is usually followed by sorting and then by material recovery for recycling or part recovery for reuse or remanufacturing. Manual estimation of disassembly time, through physical prototype disassembly or through Boothroyd and Dewhurst system, is time consuming and is not applicable in the early design stage. In this research, graph based data structures and related metrics are utilized to estimate complete and selective disassembly time at embodiment design stage. Selective disassembly is important when a single part of subassembly is to be recovered while the rest of the product is to be discarded. Selective disassembly time is estimated by merging particular nodes in assembly and bipartite graph and then recomputing the graph metrics. The method and algorithm presented in this paper is implemented using SolidWorks application programming interface (API) in Visual C#. Results are compared with the results obtained by Boothroyd and Dewhurst method, the error range is reasonable.

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Figures

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Fig. 1

EOL product operation processes

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Fig. 2

Four design stages and applicability of method developed in this research

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Fig. 3

Illustration of bolting instance by bipartite graph

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Fig. 4

Add-in structure overview

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Fig. 5

Build bipartite graph process

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Fig. 6

Build assembly graph process

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Fig. 7

Reconstruct bipartite graph process

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Fig. 8

Process of design suggestion generation

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Fig. 9

Disassembly time estimation for a toaster model

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Fig. 10

Complete disassembly time estimation result

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Fig. 11

Selective disassembly time estimation result

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Fig. 12

Highlighted part and notification dialog box for toaster

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