| 摘要 |
PROBLEM TO BE SOLVED: To provide a segment type grinding wheel secured in the sufficient safety even if temperature rises with the idling operation and possible to prevent the occurrence of a crack in a segment chip when storing. SOLUTION: A linear expansion coefficientα<SB>seg</SB>of a segment chip 12 and a linear expansion coefficientα<SB>cor</SB>of a core part 14 are necessarily and sufficiently close to each other within a numeric range satisfying a relation|(α<SB>seg</SB>-α<SB>cor</SB>)|≤6×10<SP>-6</SP>. Even if the synthetic resin binder is solidified in the relatively high temperature atmosphere, applying of the excessive compression stress to the segment chip 12 is prevented, and as a result, the occurrence of malfunction such as a crack in the segment chip 12 can be prevented. The segment type grinding wheel 10 secured in the sufficient safety thereof even if temperature rises with the idling operation and possible to prevent the occurrence of a crack of the segment chip when storing can be provided. COPYRIGHT: (C)2003,JPO
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