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A Malfunction Monitoring Technique in Drilling Operations

  • Y. S. Liao
Chapter

Summary

An on-line technique is proposed to monitor the drilling faults. The spindle motor current is found to vary with the drilling load, and it is used as the basis for the development of the monitoring technique. The current measured by a current transformer is preprocessed by a full wave rectifier and a 20 HZ bandwidth low pass Butterworth filter. Based on the common trend depicted in the resulting signal two borderlines defining the abnormal operating conditions are generated. Both of the malfunctions occur progressively and instantaneously in drilling operation can be detected. A promising result of more than 80% success rate is obtained by the combined application of these two monitoring lines in actual tests.

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References

  1. 1.
    K. Matsushima, P. Bertok and T. Sata(1982) In Process Detection of Tool Breakage by Monitoring the Spindle Motor Current of a Machine Tool, Measurement and Control for Batch Manufacturing, Edited by D.E. Hardt, Reprinted at 1982 ASME Winter Annual Meeting, pp. 145–153.Google Scholar
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    S.C. Wu(1983) On-line Detection of Tool Breakage, MS. thesis, Electric Communication Department, Chiao-Tung University, Taiwan.Google Scholar
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    S.M. Wu, T.H. Tobin and M.C. Chow(1980) Signature Analysis for Mechanical System via Dynamic Data System Monitoring Technique, Tran. of the ASME, J. of Mechanical Design, Vol. 102, No. 2, pp. 217–221.CrossRefGoogle Scholar
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    Y.S. Liao, S.M. Wu and D.S. Ermer(1982) A Time Series Approach to Quality Assurance, Inspection and Quality Control in Manufacturing Systems, Edited by W.R. DeVries and P.A. Dornfield, Reprinted at 1982 ASME Winter Annual Meeting, pp. 25–32.Google Scholar

Copyright information

© Department of Mechanical Engineering University of Manchester Institute of Science and Technology 1986

Authors and Affiliations

  • Y. S. Liao
    • 1
  1. 1.Department of Mechanical EngineeringNational Taiwan UniversityChina

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