| 摘要 |
PURPOSE: To restrain occurrence of breakage, crushing, etc., of sharp parts of super abrasive grains. CONSTITUTION: Roughly columnar rising parts 21 are arranged and formed in a roughly matrix shape in a central region of one surface 19a of a base metal 19. An abrasive grain layer 22 is provided on the one surface 19a, and a projected part 24 is made by fastening a plural number of blocky super abrasive grains 18 by a metal plating phase 25 only on each of the risen parts 21. The number of the super abrasive grains 18 provided on the projected part 24 is made 11-500 pieces, and a rate of the super abrasive grains occupied to an overall area of the abrasive grain layer in plane view is set to be in a range of 20-80%.
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