Thread milling cutter and internal pipe thread machining method using the same
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United States of America Patent
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Jun 29, 2021
Grant Date -
Oct 4, 2018
app pub date -
Sep 28, 2016
filing date -
Sep 30, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
In order to form an internal thread having a concave surface having the same shape as that obtained by using a thread cutting blade having a convex surface without using such a thread cutting blade in formation of an internal thread hole in a mold component or the like using a thread milling cutter, a trimming blade has a leading-side flank surface extending from an axial tip side of a tool body to the rear side, a top surface formed continuously to the leading-side flank surface in the axial direction, and a trailing-side flank surface formed continuously to the top surface in the axial direction. Two or more chamfered surfaces are formed between the leading-side flank surface and the top surface and between the top surface and the trailing-side flank surface in the trimming blade.
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