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Abnormality detection apparatus for tool and numerical control apparatus provided with same

  • US 6,384,560 B1
  • Filed: 09/08/2000
  • Issued: 05/07/2002
  • Est. Priority Date: 09/10/1999
  • Status: Expired due to Term
First Claim
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1. An abnormality detection apparatus for a tool to detect abnormalities of a tool used for machining of a machine tool comprising:

  • cutting load detecting means to detect a cutting load on the basis of an electric current for driving that is output to a feed drive system of the machine tool and/or an electric current for driving that is output to a spindle drive system;

    feed load estimating means to estimate a feed load on the basis of a feed rate of the feed drive system, wherein the feed load is a load component depending on the feed rate;

    tool load detecting means to compute a tool load as a load component which depends on the tool by reducing the feed load estimated by the feed load estimating means from the cutting load detected by the cutting load detecting means; and

    abnormality judging means for a tool to judge whether the tool is in an abnormal condition or not on the basis of the tool load computed by the tool load detecting means.

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