Segmental type grinding wheel

摘要

A grinding wheel of segmental type including an inner cylindrical core portion, and an outer grinding portion consisting of a plurality of segments which have abrasive layers formed of abrasive grains bonded together with a glass bonding agent and which are bonded to an outer circumferential surface of the core portion with a synthetic resin layer interposed therebetween, wherein a linear thermal expansion coefficient alphaseg (/° C.) of the segments and a linear thermal expansion coefficient alphacor (/° C.) of the core portion satisfy a formula |(alphacor-alphaseg)|<=6X10<-6>.