Patent ID: 9212961
Filing Date: 2015-12-15
Classification: B24B,G01L

Abstract:
1. A grinding abnormality monitoring method for monitoring a grinding abnormality when a plurality of work pieces of a same kind is ground by use of a grinding machine which grinds a work piece by moving the work piece relative to a grinding wheel, the method comprising: a trial grinding load detection step of setting a number of work pieces for test grinding, and detecting a trial grinding load when a trial grinding of the set number of work pieces is performed; a threshold value setting step of setting at least one of upper and lower limit threshold values of the trial grinding load detected in the trial grinding load detection step, after the test grinding of the set number of work pieces has been completed, the upper and lower threshold values varying according to an elapsed time from a start of grinding of a given work piece or to a position of the given work piece relative to the grinding wheel; performing actual grinding on a required number of work pieces to be ground, after performing the threshold value setting step during the trial grinding; an actual grinding load detection step of detecting an actual grinding load when an actual grinding of the plurality of the work pieces is performed; and a grinding abnormality determination step of determining that the grinding abnormality is generated when the actual grinding load detected in the actual grinding load detection step exceeds the upper limit threshold value or falls below the lower limit threshold value, the upper and lower threshold values varying according to the elapsed time from the start of the grinding or to the position of the work piece relative to the grinding wheel.