| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for easily and securely manufacturing a drill head in a shape brazing a cutting blade tip on a cutting blade mounting base of a head body and having high dimensional accuracy and a blade tip accuracy at a low cost. SOLUTION: The cutting blade tips 3A to 3C are brazed on cutting blade mounting bases 30a to 30c recessedly disposed at the head body 1. After a cylindrical body 20 as a screw shank 2 for a tool shank connection is concentrically welded and integrated in a rear end of the head body 1, and finished on the screw shank 2 by cutting and threading an outer circumferential surface 20a of the cylindrical body 20. COPYRIGHT: (C)2007,JPO&INPIT
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