ATBECHDEDKESFRGBGRITLILUNLSEMCPTIESILTLVFIROMKCYALTR............................JDIM350 (Ver 2.1 Jan 2001) 1990980/0 1620000/01129824EUROPEAN PATENT APPLICATIONA320031112EP01103964.120010219EnEnEn200005692320000302JP20031112200346200109052001367 7B 24D 3/28 A 7B 24D 3/08 B 7B 24D 5/04 BdeHarzgebundene Schleifscheibe mit aus metallischem Material hergestelltem KernteilenResinoid grinding wheel having core portion made of metallic materialfrMeule résinoide comportant une partie de noyau en matière métallique1NORITAKE CO., LIMITED00579174EP 295181-36, Noritake-Shinmachi 3-chomeNishi-ku, Nagoya-shi, Aichi-ken 451JPItoh, Kenji, c/o Noritake Co., Limited1-36, Noritake-shinmachi 3-chome, Nishi-kuNagoya-shi, Aichi-kenJPLeson, Thomas Johannes Alois, Dipl.-Ing.00078982Tiedtke-Bühling-Kinne & Partner GbR, TBK-Patent, Bavariaring 480336 MünchenDEATBECHCYDEDKESFIFRGBGRIEITLILUMCNLPTSETRALLTLVMKROSI20031112200346

A grinding wheel (10) including a reinforced core portion (10a) and a grinding portion (10b) which is located radially outwardly of the reinforced core portion and which has an abrasive structure in which abrasive grains (12) are held together by a bonding agent (18) in the form of a thermosetting resin. The grinding wheel is characterized in that the reinforced core portion is made of a metallic material which has a thermal expansion coefficient ranging from α-(5 × 10^-6) [1/°C] to α+(5 × 10^-6) [1/°C], where α represents a thermal expansion coefficient of the grinding portion.