Abstract
In order to improve the output of automatic assembly machines, one must not only improve their inherent reliability, but also minimise the downtime due to the lack of machined parts. The downtime essentially depends on both the mean output of the machines and transfer lines supplying the assembly machine with parts and the fluctuations in their production rate over a given time interval (hour or shift), as measured by their capability to run at a given speed. Methods are presented for analysing the effect of variations in piece part production on assembly output, and for determining what size of part stocks (buffers) are required to offset the fluctuations in piece part production.
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Abbreviations
- b :
-
index determining the curve form of the tool distribution time
- B i :
-
relative duration of downtime of theith section of the line or theith section of the flow
- G :
-
gamma function
- Q :
-
productivity of machine tool or line (pieces min−1)
- T c :
-
cycle duration (min)
- γ:
-
\(v = \frac{{D_\eta }}{{1 - \eta }}\)
- ε:
-
fraction of line failures due to equipment failure
- η:
-
utilisation factor
- λ:
-
failure rate,\(1/\bar \tau \)
- μu :
-
reconditioning rate,\(1/\bar \tau _r \)
- μu :
-
tool-reconditioning rate,\(1/\bar \tau _u \)
- \(\bar \tau \) :
-
mean time before failure (MTBF) for a machine or a line (min)
- \(\bar \tau _r \) :
-
mean time for reconditioning (min)
- \(\bar \tau _u \) :
-
mean time for tool replacement (min)
- D :
-
dispersion
- F :
-
function
- P :
-
probability
References
A. J. Dashchenko and A. Y. Zolotutin. “Optimising lay-out diagrams for various nonsynchronous assembly lines and the basis of productivity and reliability”,International Journal of Advanced Manufacturing Technology,1(1), pp. 85–94, 1985.
A. J. Dashchenko and A. P Belonosov,Design of Automatic Lines, Vyshaya shkola Publ., Moscow, p. 327, 1983 (in Russian).
Reliability Handbook, vols. 1–3, Mir Publ., Moscow, 1970.
A. J. Dashchenko, “Methods of optimisation” inAutomatic Lines in Machine Building, vol. 1. Mashinostroenie Publ., Moscow, pp. 162–239, 1984 (in Russian).
A. J. Dashchenko, “Structure optimisation and statistical modelling of technological machine systems”,International Journal of Advanced Manufacturing Technology,2(3), pp. 73–102, 1987.
A. J. Dashchenko and V. N. Redin, “Control of cutting tool replacement by durability distribution”.International Journal of Advanced Manufacturing Technology,3(5), pp. 39–60, 1988.
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Vasil'ev, V.N., Dashchenko, A.I. & Redin, V.N. Assembly-line output: Problems and approaches. Int J Adv Manuf Technol 4, 384–397 (1989). https://doi.org/10.1007/BF02604337
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DOI: https://doi.org/10.1007/BF02604337