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Simulated and Experimental Capture Times of Micro-Scale Pins Collected From a Vibratory Feeder

[+] Author Affiliations
Martha M. Luidens, Raymond J. Cipra

Purdue University, West Lafayette, IN

Paper No. DETC2007-35754, pp. 485-494; 10 pages
doi:10.1115/DETC2007-35754
From:
  • ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 5: 6th International Conference on Multibody Systems, Nonlinear Dynamics, and Control, Parts A, B, and C
  • Las Vegas, Nevada, USA, September 4–7, 2007
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 0-7918-4806-X | eISBN: 0-7918-3806-4
  • Copyright © 2007 by ASME

abstract

Challenges occur during micro-scale parts assembly due to the strong influence of electrostatic, van der Waals, capillary, and magnetic forces acting on the bodies, resulting in sticking of micro-scale parts to assembly grippers and to other parts, making part manipulation very difficult. In order to provide insight into the influences of various forces which occur while collecting micro-scale pins on a vibratory feeder, experimental tests were conducted measuring the pin capture times while varying pin length and vibrating amplitude. Based on the results from these experiments and the environment in which the tests were conducted, electrostatic forces and drag forces were found to be the most influential. From the experimental results, modifications were made to an existing impulse-based simulation to incorporate a drag force and an electrostatic force, and simulations were conducted to find the effect of changing pin length and vibrating amplitude on the pin capture times. For one micro-scale pin on the vibratory feeder bowl, both the simulated and experimental results show good correlation for the mean capture time which increases when pin length increases or when the vibrating amplitude of the feeder bowl increases. The simulation results for multiple pins when varying pin length gave mean capture times which did not follow the same trends as the experimental testing; however, due to the stochastic nature of the vibratory system, the simulated results were considered comparable. This difference when looking at multiple pins is potentially attributed to the two-dimensional nature of the simulation.

Copyright © 2007 by ASME

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