| 摘要 |
PROBLEM TO BE SOLVED: To provide a soldering drilling tool capable of stabilizing tool life. ! SOLUTION: A soldering drilling tool 1 is a soldering drilling tool in which super abrasive grains are soldered on a tip part 5 of a rotated base metal 4. The super abrasive grains comprise: main abrasive grains 9 dispersed and disposed on the tip part 5 of the base metal 4; and one or plural large diameter abrasive grains 11 whose diameter is larger than that of the main abrasive grains 9. At least one of the large diameter abrasive grains 11 is disposed on a rotary central point 5c of a tip surface 5a of the base metal 4. ! COPYRIGHT: (C)2015,JPO&INPIT |
