Patent ID: 6846233

Claim:
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 said core portion with a synthetic resin layer interposed therebetween, wherein an improvement comprises: said plurality of segments having a linear thermal expansion coefficient α seg (/° C.) while said core portion having a linear thermal expansion coefficient α cor (/° C.), said linear thermal expansion coefficient α seg (/° C.) and said linear thermal expansion coefficient α cor (/° C.) satisfying a formula |(α cor −α seg )|≦6×10 −6 ; and said synthetic resin layer being formed of an enoxy resin bonding agent cured in an atmosphere having a temperature not lower than 70° C.