Screw tap and method for the production of a screw tap
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United States of America Patent
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May 19, 2015
Grant Date -
Oct 14, 2010
app pub date -
Dec 12, 2008
filing date -
Dec 12, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
This invention relates to a screw tap which is rotatable about a rotational axis and has a number of thread-cutting teeth, which respectively have a radially outer tip cutter and are disposed mutually offset, with a predefined thread pitch, in an arrangement running spirally or helically around the rotational axis. In a lead region adjoining one end of the screw tap axially to the rotational axis, the maximum radial distance of the tip cutters of the thread-cutting teeth from the rotational axis increases with increasing axial distance of the tip cutters from one end of the screw tap according to a predefined radial distance function. At least some of the thread-cutting teeth in the lead region, at least in the region of the tip cutters, respectively have a defined cutter rounding between tool face and tool flank.
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