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Spindle speed selection for tool life testing using Bayesian inference
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DOI：10.1016/j.jmsy.2012.07.013.png)
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Abstract
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According to the Taylor tool life equation, tool life is dependent on cutting speed (or spindle speed for a selected tool diameter in milling) and their relationship is quantified empirically using a power law exponent, n, and a constant. C. which are tool-workpiece dependent. However, the Taylor tool life model is deterministic and does not incorporate the inherent uncertainty in tool life. In this work, Bayesian inference is applied to estimate tool life. With this approach, tool life is described using a probability distribution at each spindle speed. Random sample tool life curves are then generated and the probability that a selected curve represents the true tool life curve is updated using experimental results. Tool wear tests are performed using an inserted (uncoated) carbide endmill to machine AISI 1018 steel. The test point selection is based on the maximum value of information approach. The updated beliefs are then used to predict tool life using a probability distribution function. (C) 2012 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.
Keywords:
Milling
Tool wear
Tool life
Modeling
Bayesian
Decision analysis
Value of information
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