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Selective Assembly for Maximizing Profit in the Presence and Absence of Measurement Error

In: Frontiers in Statistical Quality Control 9

Author

Listed:
  • Shun Matsuura

    (Keio University, Graduate School of Science and Technology)

  • Nobuo Shinozaki

    (Keio University, Faculty of Science and Technology)

Abstract

Summary Selective assembly is an effective approach for improving the quality of a product assembled from two components when the quality characteristic is the clearance between the mating components. A component is rejected if its dimension is outside specified limits of the dimensional distribution. Acceptable components are sorted into several classes by their dimensions, and the product is assembled from randomly selected mating components from the corresponding classes. We assume that the two component dimensions are normally distributed with equal variance, and that measurement error, if any, is also normally distributed. Taking into account the quality loss of a sold product, the selling price of an assembled product, the component manufacturing cost, and the income from a rejected component, we discuss the optimal partitioning of the dimensional distribution to maximize expected profit, including the optimal choice of the distribution limits or truncation points. Equations for a set of optimal partition limits are given and its uniqueness is established in the presence and absence of measurement error. It is shown that the expected profit based on the optimal partition decreases with increasing variance of the measurement error. In addition, some numerical results are presented to compare the optimal partitions for the cases when the truncation points are and are not fixed.

Suggested Citation

  • Shun Matsuura & Nobuo Shinozaki, 2010. "Selective Assembly for Maximizing Profit in the Presence and Absence of Measurement Error," Springer Books, in: Hans-Joachim Lenz & Peter-Theodor Wilrich & Wolfgang Schmid (ed.), Frontiers in Statistical Quality Control 9, pages 173-190, Springer.
    • Handle: RePEc:spr:sprchp:978-3-7908-2380-6_12
    DOI: 10.1007/978-3-7908-2380-6_12
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