| 摘要 |
PROBLEM TO BE SOLVED: To easily judge a life span of a grinding wheel. SOLUTION: An abrasive grain part 20 is constituted of an intermediate layer 21 and an abrasive grain layer 22 formed on an upper surface of the intermediate layer 21 and containing diamond abrasive grains 22a. The intermediate layer 21 contains diamond abrasive grains 21a and micro capsules 21b to lower grinding performance of the grinding wheel 1 by a cushioning effect. COPYRIGHT: (C)2008,JPO&INPIT
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