Threading tool and method of threading
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United States of America Patent
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Jun 4, 2019
Grant Date -
Dec 28, 2017
app pub date -
Jun 23, 2017
filing date -
Jun 27, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A threading tool includes: a tool main body; and a cutting edge portion, which is provided on a tip portion of the tool main body and has a rake face and a flank face. The cutting edge portion includes: a primary cutting edge extending in a tooth width direction of the cutting edge portion; two corner edges, one and other of which are provided on one and other of both ends of the primary cutting edge, respectively, and are in a convex curve shape; and two secondary cutting edges, one and other of which extend from the one and the other of the two corner edges to a rear end side of the cutting edge portion, respectively. Two secondary cutting edges are shorter than the primary cutting edge. At least one of the two secondary edges is slanted to a direction intersecting the primary cutting edge in an obtuse angle.
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