| 摘要 |
PROBLEM TO BE SOLVED: To provide a non-core drill for performing grinding work by giving an eccentric motion together with the rotational motion of a shank, which non-core drill can improve the grinding efficiency for hard and brittle materials. SOLUTION: The non-core drill 1 comprises a diamond wheel portion 2 at the tip end of the shank 3 serving as a rotary shaft. The diamond wheel portion 2 is turned about the axisαof the shank 3. In addition, the eccentric motion is given to the diamond wheel portion 2 and the hard and brittle material 16 to be ground in order to carry out the grinding work. A recessed portion 14 is formed at least at the axis portionαof the shank in the tip end face 13 of the diamond wheel portion 2. The tip end face 13 of the diamond wheel portion 2 except the recessed portion 14 serves as a tip end abrasive surface for grinding the hard and brittle material 16. COPYRIGHT: (C)2008,JPO&INPIT
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