THREAD MILLING CUTTER AND INTERNAL PIPE THREAD MACHINING METHOD USING SAME

摘要

[Problem] To form an internal thread having the same concave curve as with thread milling blades having the shape of a concave curve, without using such thread milling blades, when forming an internal thread in a mold component or the like using a thread cutting cutter. [Solution] In this thread milling cutter, a finishing blade 12 has an advancing-side flank face 17, a top face 16 axially continuous with the advancing-side flank face 17, and a following-side flank face 18 axially continuous with the top face 16, which are formed from the leading end to the rear in the axial direction of this tool body. Two or more chamfered surfaces 25 and 26 are formed between the advancing-side flank face 17 and the top face 16 and between the top face 16 and the following-side flank face 18.