Abstract
This article shows the consequences of using parts with scrap in an automatic assembly system. The scrap is the percentage of parts that do not reach the required conformity and will cause either a defective assembly or a jam in the system. The two consequences considered here are extra cost and loss of productivity. To show this, we will focus on one part assembly operation anywhere in the process, which consists of feeding, assembling the part and inspecting the resulting sub-assembly.
We will show that the effect of scrap can be huge and depends strongly on how the bad part is detected. 4 cases are considered: 1.The parts are sorted before feeding 2.The bad parts jam in the feeder 3.The bad parts jam while assembling 4.The sub-assembly with bad parts is ejected after inspection. By evaluating each case in 3 examples, we will show that case 3 is often the worst. We will also define the conditions where it is better to sort the parts first (1), let them jam in the feeder (2) or sort the sub-assemblies (4).
Chapter PDF
Similar content being viewed by others
Keywords
References
Buzaeott, J.-A. and Shanthikumar, J.-G. (1993). Stochastic models of manufacturing systems. Prentice Hall.
Dubois, D. and Forestier, J. (1981). Productivité et en-cours moyens d’un ensemble de deux machines séparées par une zone de stockage. R.A.I.R.O. Autom. Syst. Analysis and Control, 16:105–132.
Gershwin, S. B. (1994). Manufacturing Systems Engineering. PTR Prentice Hall.
Han, M.-S. and Park, D.-J. (2002). Performance analysis and optimization of cyclic production lines. IIE Transactions, 34:411–422.
Heinzelmann, E. (1995). Simas ii-ein simulationswerkzeug für kmu. Technische Rundschau Transfer, 3:24–29.
Hong, C., Milor, L., Choi, M., and Lin, T. (2005). Study of area scaling effect on integrated circuit reliability based on yield models. Microelectronics reliability, 45(9–11):1305–1310.
Hongler, M. O. (1994). Chaotic and Stochastic Behaviour in Automatic Production Lines. Springer Verlag.
Jacot, J. (2004). Industrialisation, Notes de cours. EPFL.
Medhi, J. (2003). Stochastic Models in Queuing Theory. Academic Press.
Oulevey, M., Roduit, P., Koelemeijer, S., and Jacot, J. (2003). A cost model for flexible high speed assembly lines (erace project).
Terracol, C. and David, R. (1987). Performance d’une ligne composée de machines et de stocks intermédiaire. APII, 21:239.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2006 International Federation for Information Processing
About this paper
Cite this paper
Oulevey, M., Koelemeijer, S., Jacot, J. (2006). Impact of Bad Components on Costs and Productivity in Automatic Assembly. In: Ratchev, S. (eds) Precision Assembly Technologies for Mini and Micro Products. IPAS 2006. IFIP International Federation for Information Processing, vol 198. Springer, Boston, MA. https://doi.org/10.1007/0-387-31277-3_27
Download citation
DOI: https://doi.org/10.1007/0-387-31277-3_27
Publisher Name: Springer, Boston, MA
Print ISBN: 978-0-387-31276-7
Online ISBN: 978-0-387-31277-4
eBook Packages: Computer ScienceComputer Science (R0)