Journal of the Korean Society for Precision Engineering (한국정밀공학회지)
- Volume 10 Issue 4
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- Pages.94-103
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- 1993
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- 1225-9071(pISSN)
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- 2287-8769(eISSN)
Tool Wear Monitoring Scheme by Modeling of the Cutting Dynamics by Time-series Method
Time-series 방법으로 모델링한 절삭역학에 의한 공구마모감시방법
Abstract
In this work, the imaginary part of the inner modulation transfer function of the cutting dynamics is introduced for tool wear monitoring. Time-series method is utilized to construct the general three dimensional cutting dynamics whose imaginary part of the inner modulation transfer funcition shows the proportionality to tool wear at the natural frequency of the machine tool dynamics. Thus model is reduced to single-input single-output model without altering the proportionality characteristics to tool wear and implemented to the dual computer system in which one computer performs measurement while the other calculates the imaginary part of the inner modulation transfer function of the cutting dynamics by the batch least square method. The values of the imaginary part at the natural requency of the machine tool structure in the cutting direction are compared to the one calculated during machining with a brand new tool to decide the current status of the tool. The experiments shows the relevance of the proposed concept.
Keywords