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Machine tool with worn-detection function for tool

  • US 5,921,726 A
  • Filed: 04/22/1997
  • Issued: 07/13/1999
  • Est. Priority Date: 04/23/1996
  • Status: Expired due to Term
First Claim
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1. A machine tool with a worn detection function for a tool, comprising:

  • a main shaft attached with the tool and supported by an air static-pressure bearing to be rotated;

    a shaft driving motor driving said main shaft to rotate;

    a consumption-power detection means for detecting consumption power of said shaft driving motor; and

    a worn-detection means for detecting wear on the tool by memorizing a reference consumption power of said shaft driving motor and comparing the reference consumption power with consumption power detected by said consumption-power detection means, wherein said worn-detection means includes a cut-starting detector for detecting the start of a cutting process for a predetermined work piece by using the consumption power obtained from said consumption-power detection means, a reference-value stored area storing the consumption power of said shaft driving motor during the cutting process for the predetermined work piece as time-series values in elapsed-time from the start of the cutting process and outputting the reference consumption power of the time points, an accord controller for fetching the reference consumption power corresponding to the present time from said reference-value stored area, based on the elapsed time from the start of the cutting process, detected by said cut-starting detector, to the present time, and a comparing area for comparing the reference consumption power fetched by said accord controller, with the present consumption power obtained from said consumption-power detection means, said reference-value stored area storing and said accord controller fetching the reference consumption power at predetermined sampling times.

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