PURPOSE: To provide a steel piece maintenance cleaning grinding wheel capable of realizing improving grinding efficiency by eliminating necessity for increasing grinding power and for enlarging a thickness of the grinding wheel with small rotary drive force and without worsening grinding performance (sharpness). ;CONSTITUTION: In grading (gage) of an abrasive standardized in JIS R6001, in the case of forming a shape with an external diameter 400mm or more further with thickness 10mm or more less than 50mm, and in the case of forming a shape with thickness 15mm or more 45mm or less, further in the case of forming a shape with thickness 20mm or more 40mm or less, a grinding wheel has a grinding work part 1c using an abrasive of mixing 10 to 40wt.% fine grain abrasive of two-grading (gage) separated different kind or the same kind. The grinding wheel has a fine grain reinforced part 1b around a hole part 1a, to mix a 2.5 to 20wt.% cut glass fiber reinforcing material in the fine grain reinforced part 1b.;COPYRIGHT: (C)1996,JPO
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