Threading cutter and female screw processing method using the same

摘要

To provide a female threaded hole in a die part or the like by using a thread cutting mill without using a thread cutting blade having a convex curved surface, it is possible to form a concave similar to that in the case of using a thread cutting blade having that shape Form female thread with curved surface.SOLUTION: The tool body has a leading side flank face 17, a mountain top face 16 continuous with the leading side flank face 17 in the axial direction from the axial front end side to the rear side, and an additional side flank face 18 which is continuous in the axial direction to the advanced side flank face 16 Two or more chamfered surfaces 25 and 26 are respectively formed between the leading side flank surface 17 and the mountain top surface 16 of the finishing blade 12 and between the mountain top surface 16 and the following side flank surface 18.BACKGROUND OF THE INVENTION