MACHINE LEARNING DEVICE, CNC DEVICE AND MACHINE LEARNING METHOD FOR DETECTING INDICATION OF OCCURRENCE OF CHATTER IN TOOL FOR MACHINE TOOL

摘要

A machine learning device for detecting an indication of an occurrence of chatter in a tool for a machine tool, includes a state observation unit which observes at least one state variable of a vibration of the machine tool itself, a vibration of a building in which the machine tool is installed, an audible sound, an acoustic emission and a motor control current value of the machine tool, in addition to a vibration of the tool; and a learning unit which generates a learning model based on the state variable observed by the state observation unit.