| 摘要 |
PROBLEM TO BE SOLVED: To provide a throw-away tap reduced in manufacturing cost and improved in mounting accuracy by simplifying a structure of connection section of a threaded section to a body section even if the threaded section is detachably configured. SOLUTION: A fitting raised section 23 and a fitting recessed section 33 both having an almost regular triangular cross section are provided on the mating surface of the body section 3 and threaded section 2. This configuration sufficiently secures an effective fracture area and definitely suppresses a fracture of the connection section caused by torsional torque at the time of processing. Further, the large-reduction of manufacturing cost and the large-improvement of mounting acccuracy of both sections are simultaneously realized because a connection structure is of a simple shape even though the body section 3 and threaded section 2 are strongly fixed. COPYRIGHT: (C)2006,JPO&NCIPI
|
