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Method of monitoring and system for monitoring and evaluating wear of a grinding wheel by means of acoustic emissions generated during grinding process
Method of monitoring and system for monitoring and evaluating wear of a grinding wheel by means of acoustic emissions generated during grinding process
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机译：借助于在研磨过程中产生的声发射来监测和评估砂轮磨损的监测方法和系统
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摘要
The present invention relates to a method of monitoring and evaluating wear of a grinding wheel by means of acoustic emissions generated during grinding process due to chip withdrawal. In the course of the entire grinding phase, there is identified and recorded a signal representing a level of acoustic emissions and number of strokes, whereupon the thus recorded signal of the acoustic emissions is divided into signal samples, which correspond to the individual strokes of the grinding machine. Each portion of each signal sample is the compared with a predetermined distribution into voltage levels, whereby the number of local peaks of the acoustic emission signal, which fit in the corresponding level, is added for each grinding machine table stroke. A characteristic diagram of the number of the local peaks of the acoustic emission signals in the individual levels is then plotted for each stroke; the diagrams of the individual strokes are grouped for the entire grinding cycle into one set of curves, which are displayed. Subsequently, a final form of the curve set that merges for the worn out grinding wheel into a narrow bundle is evaluated in the representation. The invention also relates to system for making the above-described method, the system comprising an acoustic emission sensor (1), a medium (2) for storing a data file generated by the sensor (1) and an indicator (3) of a number of machining strokes. It further comprises a computation unit (4) of frequency of the local peaks of the acoustic emission signals with a detector (41) of local peaks, a classification unit (42) of the local peaks, a device (43) for arranging the local peaks into signal levels, and a unit (44) for elimination of the lowest signal peak wherein a control element (6) for setting the number of levels, a control element (7) for setting the signal width, and a visual display unit (5), are arranged outside the computation unit (4).
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