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TECHNICAL PAPERS

A Method for Attachment Design Concept Development in Integral Snap-fit Assemblies

[+] Author and Article Information
Suat Genc

Plug Power Latham, NY 12110

Robert W. Messler

Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180

Gary A. Gabriele

Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, NY 12180

J. Mech. Des 122(3), 257-264 (Jan 01, 1999) (8 pages) doi:10.1115/1.1287926 History: Received January 01, 1999
Copyright © 2000 by ASME
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References

Bonenberger,  P., 1994, “Stretching the Limits of DFM,” Mach. Design, 66, pp. 67–70.
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Bonenberger,  P., 1996, “A Design Methodology for Integral Attachments,” Plast. Eng. (N. Y.), 52, pp. 27–30.
Genc,  S., Messler,  R. W., Gabriele,  G. A., and Bonenberger,  P. R., 1997, “Enumerating possible design options for integral attachment using a hierarchical classification scheme,” ASME Trans., J. Mech. Des. 119, No. 2, pp. 178–184.
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Messler,  R. W., and Genc,  S., 1998, “Integral Micro-Mechanical Interlock (IMMI) Joints for Polymer-Matrix Composite Structures,” J. Thermoplast. Compos. Mater., 11, pp. 200–216.
Messler,  R. W., Genc,  S., and Gabriele,  G. A., 1997, “Integral attachment using snap-fits: a key to assembly automation, part 1-introduction to integral attachment using snap-fit features,” J. Assembly Autom., 17, No. 2, pp. 140–152.
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Pugh, S., 1996, Creating Innovative Products Using Total Design: The Living Legacy of Stuart Pugh, Clausing, D., and Andrade, R., eds., Addison-Wesley, Reading, MA.
Genc, S., Messler, R. W., Jr., and Gabriele, G. A., 1997b, “Generating alternative attachment concepts in integral snap-fit assemblies,” Proceedings of ICED ’97, the 11th International Conference on Engineering Design, Tampere, Finland, August 19–21, 1997, pp. 749–752.
Messler,  R. W., Genc,  S., and Gabriele,  G. A., 1997, “Integral attachment using snap-fits: a key to assembly automation, part 4-selection of locking features,” J. Assembly Autom., 17, No. 4, pp. 315–328.
Messler,  R. W., Genc,  S., and Gabriele,  G. A., 1997, “Integral attachment using snap-fits: a key to assembly automation, part 2-bringing order to integral attachment: attachment-level design,” J. Assembly Autom., 17, No. 2, pp. 153–162.
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Genc, S., Messler, R. W., Jr., and Gabriele, G. A., 1997d, “Methodology for locking feature selection in integral snap-fit assembly,” Proceedings of ASME’97 DETC/DAC, the 23rd Design Automation Conference, Sacramento, CA, September 14–17, 1997.
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Genc,  S., Messler,  R. W., and Gabriele,  G. A., 1998, “Integral attachment using snap-fits: a key to assembly automation, part 6-evaluating alternatives for design optimization,” J. Assembly Autom., 18, No. 2, pp. 153–165.
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Figures

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Integral attachment design in the overall design process
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Steps for generating and evaluating alternative attachment concepts (from Genc, et al., 1997b)
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Genc’s hierarchical classification scheme of representative shapes (from Genc, et al., 1997a)
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Examples of generating alternative representative shapes for parts to be attached in an assembly. These parts shown are a speaker and cover for a phone hand-set.
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Alternative representative shapes generated for example parts by using Genc’s classification scheme (Genc, et al., 1997a)
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Identification of possible part combinations and assembly procedures
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Identification of alternative locking feature pairs
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Part constraining process to obtain a basis design
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Enhanced attachment concepts
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Structural performance value for the example attachment concepts
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a) Determination of relative manufacturing cost penalty in which the number of external and internal undercuts are counted, and mold dividing surface complexity is considered, b) example concepts to be evaluated based on assembly cost
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Assembly cost penalty for example concepts

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