VITRIFIED GRINDING STONE AND ITS MANUFACTURING METHOD, AND METHOD FOR GRINDING CAST IRON WORKPIECE USING THE SAME GRINDING TOOL

摘要

PROBLEM TO BE SOLVED: To provide a vitrified grinding stone having a long service life, even under a high load condition, and its manufacturing method, and a method for grinding a cast iron workpiece using the grinding stone.;SOLUTION: In this vitrified grinding stone 10, a degree of concentration of super-abrasive grain 12 is 160 to 185, a volume ratio of aggregate 14 is 3 to 10 volume%, a particle size is #170 to #270, a difference of a particle diameter between a minimum particle and a maximum particle is within 0.014 mm, and glassy bonding agent 16 having a softening point ≥550°C occupies 25 to 35 volume%. When the cast iron workpiece is ground by using the vitrified grinding tool 10, grinding efficiency is set at 120 to 200 mm³/mm× second, and peripheral speed of the vitrified grinding tool 10 and the cast iron workpiece is set at ≥100 m/second.;COPYRIGHT: (C)2007,JPO&INPIT