In modern production systems (such as FMS, CIMS, etc.), when the tool abnormally worn or damaged, if not promptly discovered and taken measures would lead to the workpiece scrap, and even damage to the machine, causing great loss. Therefore, the tool condition monitoring is very important.
Monitoring tool breakage monitoring can be divided into two kinds of indirect and direct monitoring. The so-called direct monitoring, namely direct observation tool status, to confirm whether the tool breakage. One of the most typical approach is to ITV (Industrial Television, industrial television) camera method. Namely the use of indirect monitoring method and tool breakage or other physical phenomena associated physical indirectly determine whether the tool has been damaged or if there is a harbinger of imminent damage. Such methods are measuring force method, thermometry, vibration measurement method to measure the main motor current measuring method and acoustic emission method.