Title

Minimizing the expected processing time on a flexible machine with random tool lives

Document Type

Article

Date of Original Version

1-1-2006

Abstract

We present a stochastic version of economic tool life models for machines with finite capacity tool magazines and a variable processing speed capability, where the tool life is a random variable. Using renewal theory to express the expected number of tool setups as a function of cutting speed and magazine capacity, we extend previously published deterministic mathematical programming models to the case of minimizing the expected total processing time. A numerical illustration with typical cutting tool data shows the deterministic model underestimates the optimal expected processing time by more than 8% when the coefficient of variation equals 0.3 (typical for carbide tools), and the difference exceeds 15% for single-injury tools having an exponentially distributed economic life (worst case). Copyright © "IIE".

Publication Title

IIE Transactions (Institute of Industrial Engineers)

Volume

38

Issue

1

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