Patent ID: 8862429
Filing Date: 2014-10-14
Classification: B23Q

Abstract:
1. An operating history management method, by a management apparatus, for managing an operating history of a machine tool that includes a rotary shaft for rotating a tool or a work piece, wherein the method executes: a first step of detecting a rotation speed of the rotary shaft and a vibration acceleration in a frequency domain occurring in the rotary shaft; a second step of determining whether or not the detected rotation speed has varied from a previously detected rotation speed and determining whether or not a maximum value of the vibration acceleration in the frequency domain exceeds a predetermined threshold; and a third step of determining as to whether or not a rotation speed modification command has been input into the machine tool when the rotation speed has varied or the maximum value exceeds the predetermined threshold, when the rotation speed modification command has been input, adding information relating to the rotation speed modification command and storing at least the rotation weed of the rotary shaft and the vibration acceleration in the frequency domain as the operating history in association with the added information relating to the rotation speed modification command, and when the rotation speed modification command has not been input, storing the operating history in association with most recently added information relating to the rotation speed modification command.