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RESEARCH PAPERS

Data Dependent Systems Approach to Stochastic Tool Life and Reliability

[+] Author and Article Information
S. M. Pandit

Mechanical Engineering-Engineering Mechanics Department, Michigan Technological University, Houghton, Mich.

J. Eng. Ind 100(3), 318-322 (Aug 01, 1978) (5 pages) doi:10.1115/1.3439432 History: Received August 05, 1977; Online July 15, 2010

Abstract

A Data Dependent Systems approach is outlined for obtaining tool life distribution and reliability models directly from shop floor and/or laboratory failure data. The approach does not require any a-priori knowledge of the distribution and can be used with a limited amount of data. Estimation of the first order model is illustrated by application to HSS tools in turning. The tool life signatures at three different speeds are exhibited in the form of plots of hazard rate, reliability and failure time probability density functions. Formulation of simple tool replacement strategies from these plots by the shop personnel is illustrated; the mathematical expressions given for these functions can be used to develop more elaborate optimal strategies in computerized adaptive control. It is shown that most of the commonly used tool life distributions are well approximated by special cases of the first order model and hence are included in the approach.

Copyright © 1978 by ASME
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