PatentDOI
Acoustic detection of tool wear and fracture
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TLDR
In this paper, an acoustic emission monitoring system has a converter for converting acoustic emission into an electric signal, a filter for rejecting frequency components in the signal below a frequency between 50 kHz and 300 kHz, a detector to detect the amplitude of the signal after the rejection of those frequency components, and a comparator for comparing that amplitude to a predetermined reference amplitude.Abstract:
For detecting brittle fracture and wear of a tip of a cutting tool an acoustic emission monitoring system has a converter for converting acoustic emission into an electric signal, a filter for rejecting frequency components in the signal below a frequency between 50 kHz and 300 kHz, a detector to detect the amplitude of the signal after the rejection of those frequency components, and a comparator for comparing that amplitude to a predetermined reference amplitude.read more
Citations
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Patent
Cutting tool wear detection apparatus and method
TL;DR: In this article, a method and apparatus are described for continuously monitoring a ratio of spindle force or power or low frequency vibration energy to high frequency vibrational energy during the cutting process, and generating an output warning signal when the radio reaches a preselected level correlated with excessive tool wear.
Patent
Method for monitoring cutting tool wear during a machining operation
TL;DR: In this article, the vibration of an end mill (36) is sensed by either microphones (42, 44, 46) or accelerometers (78, 80, 82) and a time domain signal is produced by these sensors which is converted into a near-real time frequency spectrum.
Patent
Device for detecting tool abnormality
TL;DR: In this paper, a torque limiter disconnects the drill from a main spindle and generates high-level elastic waves, which are converted by a transducer into a voltage signal.
PatentDOI
Acoustic detection of tool break events in machine tool operations
TL;DR: In this paper, a system and method for monitoring vibrations of a cutting tool produced by tool break events, and for interpreting them to detect tool breaks of sufficient magnitude to endanger the machined part is presented.
PatentDOI
Acoustic monitoring of cutting conditions to detect tool break events
TL;DR: In this article, a tool break detection system relies on monitoring changes in the cutting noise itself, rather than detecting the tool fracture acoustic signal, and a broken tool capable of damaging the workpiece is detected, and tool break events that do not affect cutting conditions are ignored.
References
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Patent
Acoustic emission crack monitor
TL;DR: In this article, a system for monitoring crack growth in a structure in which acoustic energy released as a result of a crack event is sensed and integrated to provide a binary signal representative of the number and intensity of individual crack events.
Patent
Automatic sonic detection of chipped cutting tools
TL;DR: In this paper, a cutting tool wear signal is obtained in known manner by sensing the sonic vibrations generated by the cutting action and extracting the high frequencies indicative of cutting tools' wear.
Patent
Tool wear detector
TL;DR: In this paper, the authors present a tool wear detector where a tool change condition is determined by establishing a reference value representing the broadband vibrational energy output of the tool during utilization thereof in a relatively unworn condition.
Patent
Apparatus for detecting damages of cutting tools
TL;DR: In this article, the root mean square value of the output signal from the detector is compared with the data produced at the time of normal cutting, where when an abnormal vibration occurs due to the damage of the cutting tool the cutting operation is stopped by using a signal from a comparator.