Resinoid grinding wheel having core portion made of metallic material

(19)

(11)

EP 1 129 824 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	12.11.2003 Bulletin 2003/46

(43)	Date of publication A2:
	05.09.2001 Bulletin 2001/36

(21)	Application number: 01103964.1

(22)	Date of filing: 19.02.2001

(51)	International Patent Classification (IPC)⁷: B24D 3/28, B24D 3/08, B24D 5/04

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

02.03.2000 JP 2000056923

(71)	Applicant: NORITAKE CO., LIMITED
	Nishi-ku, Nagoya-shi, Aichi-ken 451 (JP)

(72)	Inventor:
	Itoh, Kenji, c/o Noritake Co., Limited Nagoya-shi, Aichi-ken (JP)

(74)	Representative: Leson, Thomas Johannes Alois, Dipl.-Ing.
	Tiedtke-Bühling-Kinne & Partner GbR, TBK-Patent, Bavariaring 4 80336 München 80336 München (DE)

(54)	Resinoid grinding wheel having core portion made of metallic material

(57) 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.

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