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Design and fabrication of miniature compliant hinges for multi-material compliant mechanisms

  • Wojciech Bejgerowski
  • John W. Gerdes
  • Satyandra K. GuptaEmail author
  • Hugh A. Bruck
ORIGINAL ARTICLE

Abstract

Multi-material molding (MMM) enables the creation of multi-material mechanisms that combine compliant hinges, serving as revolute joints, and rigid links in a single part. There are three important challenges in creating these structures: (1) bonding between the materials used, (2) the ability of the hinge to transfer the required loads in the mechanism while allowing for the prescribed degree(s) of freedom, and (3) incorporating the process-specific requirements in the design stage. This paper presents the approach for design and fabrication of miniature compliant hinges in multi-material compliant mechanisms. The methodology described in this paper allows for the concurrent design of the part and the manufacturing process. For the first challenge, mechanical interlocking strategies are presented. For the second challenge, the development of a simulation-based optimization model of the hinge is presented, involving functional and manufacturing constrains. For the third challenge, the development of hinge positioning features and gate positioning constraints is presented. The developed MMM process is described, along with the main constraints and performance measures. This includes the process sequence, the mold cavity design, gate selection, and runner system development. A case study is presented to demonstrate the feasibility of creating multi-material mechanisms with miniature hinges serving as joints through MMM process. The approach described in this paper was utilized to design a drive mechanism for a flapping wing micro air vehicle. The methods described in this paper are applicable to any lightweight, load-bearing compliant mechanism manufactured using multi-material injection molding.

Keywords

Injection molding Multi-material molding Compliant mechanisms 

References

  1. 1.
    Bejgerowski W, Ananthanarayanan A, Mueller D, Gupta SK (2009) Integrated product and process design for a flapping wing drive mechanism. J Mech Des 131(6):061006CrossRefGoogle Scholar
  2. 2.
    Gouker RM, Gupta SK, Bruck HA, Holzschuh T (2006) Manufacturing of multi-material compliant mechanisms using multi-material molding. Int J Adv Manuf Technol 30(11–12):1049–1075CrossRefGoogle Scholar
  3. 3.
    Howell LL (2001) Compliant mechanisms. Wiley-Interscience, New YorkGoogle Scholar
  4. 4.
    Mueller D, Gerdes J, Gupta SK (2009) Incorporation of passive wing folding in flapping wing miniature air vehicles. In: Proceedings of the ASME Mechanism and Robotics Conference, 87543, San Diego, CAGoogle Scholar
  5. 5.
    Rotheiser J (2004) Joining of plastics, handbook for designers and engineers. Hanser Gardner, MunichGoogle Scholar
  6. 6.
    Bruck HA, Fowler G, Gupta SK, Valentine T (2004) Using geometric complexity to enhance the interfacial strength of heterogeneous structures fabricated in a multi-stage, multi-piece molding process. Exp Mech 44(3):261–271CrossRefGoogle Scholar
  7. 7.
    Mankame ND, Ananthasuresh GK (2004) A novel compliant mechanism for converting reciprocating translation into enclosing curved paths. J Mech Des 126(4):667–672CrossRefGoogle Scholar
  8. 8.
    Bailey SA, Cham JG, Cutkosky MR, Full RJ (1999) Biomimetic robotic mechanisms via shape deposition manufacturing. In: Proceedings of the 9th International Symposium of Robotics Research, Snowbird, UT, 9–12 OctoberGoogle Scholar
  9. 9.
    Rajagopalan S, Goldman R, Shin KH, Kumar V, Cutkosky MR, Dutta D (2000) Representation for the design, processing and freeform fabrication of heterogeneous objects. Mater Des 22:185–197CrossRefGoogle Scholar
  10. 10.
    Beaman J, Bourell D, Jackson B, Jepson L, McAdams D, Perez J, Wood K (2000) Multi-material selective laser sintering: empirical studies and hardware development. In: Proceedings of the NSF Design and Manufacturing Grantees Conference, Vancouver, Canada, JanuaryGoogle Scholar
  11. 11.
    Jackson TR, Sachs EM, Cima MJ (1998) Modeling and designing components with locally controlled composition. In: Proceedings of the Solid Freeform Fabrication Symposium, AugustGoogle Scholar
  12. 12.
    Sun S, Sergeev N, Francis J, Kostov Y, Yang M, Bruck HA, Herold KE, Rasooly A (2009) Laminated object manufacturing (LOM) technology based multi-channel lab-on-a-chip for enzymatic and chemical analysis. In: Herold K, Rasooly A (eds) Lab-on-a-chip technology: fabrication and microfluidics. Horizon Scientific Press, Norwick, UKGoogle Scholar
  13. 13.
    Tres PA (2004) Designing plastic parts for assembly, 2nd edn. Hanser Gardner Publications, Cincinnati, Ohio, USAGoogle Scholar
  14. 14.
    Priyadarshi AK, Gupta SK, Gouker R, Krebs F, Shroeder M, Warth S (2007) Manufacturing multi-material articulated plastic products using in-mold assembly. Int J Adv Manuf Technol 32(3–4):350–365CrossRefGoogle Scholar
  15. 15.
    Beaumont JP (2004) Runner and gating design handbook: tools for successful injection molding. Hanser Gardner Publications, CincinnatiGoogle Scholar
  16. 16.
    Mekhilef N, Aitkadi A, Ajji A (1995) Weld lines in injection-molded immiscible blends—model predictions and experimental results. Polymer 36(10):2033–2042CrossRefGoogle Scholar
  17. 17.
    Selden R (1997) Effect of processing on weld line strength in five thermoplastics. Polym Eng Sci 37(1):205–218CrossRefGoogle Scholar
  18. 18.
    Breugel F, Teoh ZE, Lipson H (2009) Flying insects and robots. Springer, Berlin HeidelbergGoogle Scholar
  19. 19.
    Hsu CK, Evans J, Vytla S, Huang PG (2010) Develoment of flapping wing micro air vehicles—design, CFD, experiment and actual flight. In: Proceedings of the 48th AIAA Aerospace Sciences meeting including The New Horizons Forum and Aerospace Exposition, AIAA 2010–1018: Orlando, FloridaGoogle Scholar
  20. 20.
    Tsai BJ, Fu YC (2009) Design and aerodynamic analysis of a flapping-wing micro aerial vehicle. Aerosp Sci Technol 13(7):383–392CrossRefGoogle Scholar
  21. 21.
    Tantanawat T, Kota S (2007) Design of compliant mechanisms in minimizing input power in dynamic application. J Mech Des 129(10):1064–1075CrossRefGoogle Scholar
  22. 22.
    Zhou H, Ting K (2006) Shape and size synthesis of compliant mechanisms using wide curve theory. J Mech Des 128(3):551–558CrossRefGoogle Scholar
  23. 23.
    Advani SG, Tucker CL III (1987) The use of tensors to describe and predict fiber orientation in short fiber composites. J Rheol 31(8):751–784CrossRefGoogle Scholar
  24. 24.
    Folgar FP, Tucker CL (1984) Orientation behaviour of fibers in concentrated suspensions. Reinf Plast Compos 3(2):98–119CrossRefGoogle Scholar

Copyright information

© Springer-Verlag London Limited 2011

Authors and Affiliations

  • Wojciech Bejgerowski
    • 1
  • John W. Gerdes
    • 1
  • Satyandra K. Gupta
    • 1
    • 2
    Email author
  • Hugh A. Bruck
    • 1
  1. 1.Department of Mechanical EngineeringUniversity of MarylandCollege ParkUSA
  2. 2.Institute for Systems ResearchUniversity of MarylandCollege ParkUSA

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