×

Method and device for detecting tool abnormality in machine tools

  • US 4,456,960 A
  • Filed: 03/25/1981
  • Issued: 06/26/1984
  • Est. Priority Date: 03/27/1980
  • Status: Expired due to Term
First Claim
Patent Images

1. A device for detecting tool abnormalities in machine tools as machining is in process whether machine tool data values are determined from and are a function of the operating conditions of the machine tool, and wherein a tool abnormality is detected by comparing said machine tool data values to a theshold data value, comprising:

  • (a) a machine tool control unit for outputting a machining-in-process signal as machining is in process, for determining and outputting machine tool data values and for terminating machining in response to receipt of a stop-machining signal;

    (b) a threshold setting switch; and

    (c) an abnormality detection unit connected to the machine tool control unit and the threshold setting switch for determining and automatically setting the threshold data value according to machine tool data values received from the machine tool control unit when the threshold setting switch is on, for comparing machine tool data values received from the machine tool control unit when the abnormality detector unit receives a machining-in-process signal from the machine tool control unit when the threshold setting switch is off to the set threshold data value, and for outputting a stop-machining signal to the machine tool control unit if a comparision indicates a machine tool abnormality.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×