GRINDING METHOD AND GRINDING MACHINE

摘要

A core grinding wheel that has a grinding layer on an outer periphery of a core is used. An ultrasonic wave is output from an ultrasonic sensor to the grinding layer via grinding fluid. An ultrasonic measuring device control unit calculates a thickness of the grinding layer on the basis of a sonic velocity in the grinding layer and an arrival time difference between a reflected wave from a surface of the grinding layer and a reflected wave from a surface of the outer periphery of the core. A grinding process and a truing process are controlled on the basis of an outside diameter of the grinding wheel, which is calculated on the basis of the measured thickness of the grinding layer and an outside diameter of the core.