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Monitoring machine tool conditions by measuring a force component and a vibration component at a fundamental natural frequency

  • US 4,559,600 A
  • Filed: 02/28/1983
  • Issued: 12/17/1985
  • Est. Priority Date: 02/28/1983
  • Status: Expired due to Fees
First Claim
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1. A method for monitoring, during machining of a workpiece, the wear condition of a cutting tool having a cutting portion in a structure that is held by substantially more massive means, comprisingmeasuring the component of the dynamic force exerted between the tool and the workpiece approximately in the direction normal to the primary cutting edge of the tool and to the main cutting velocity at approximately the fundamental natural frequency of the held structure in the same normal direction,measuring the component of vibration in the tool approximately in the same normal direction at approximtely the same frequency,computing the value of a predetermined wear indicative function of the ratio of the measured force component to the measured vibration component, andproviding a predetermined type of response to the computed value of the function comprising at least one of the following operations,(a) adjusting cutting conditions to control the rate of wear,(b) adjusting the position of the tool relative to the workpiece to compensate for recession in the cutting portion of the tool,(c) replacing the tool when the wear on a cutting portion exceeds a selected limit.

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