| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary diamond grinding tool obtaining high efficient and good accurate grinding performance. SOLUTION: In this rotary grinding tool 10, a plurality of super hard quality external peripheral cutting edges (columnar super hard member) 14 are secured with a prescribed space so as to protrude from an external peripheral part of a rotary unit 12 in a tilted condition relating to the diametric direction B so as to be toward the rotational direction A as going toward the trip end side, that is, the external peripheral side, so that a positive rake angleθs is formed in a side surface on the side of the rotational direction A in a tip end part of the super hard external peripheral blade (columnar super hard member) 14, consequently, accurate grinding is continuously performed in high efficiency. That is, even when the tip end part of the external peripheral cutting edge (super hard member) is worn, by preventing a change of its shape, a grinding condition is not changed to continuously obtain high efficient accurate grinding, also by eliminating retraction of a bond and coming off of an abrasive grain as compared with a grinding wheel connecting the abrasive grain by a bond, no scratch and chipping are generated, and a good grinding surface is obtained.
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