Method for making a die for roll forming a dual threaded bolt
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United States of America Patent
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Mar 19, 2019
Grant Date -
N/A
app pub date -
Oct 6, 2016
filing date -
Oct 6, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
The die forming process includes first passing a circular coarse thread cutter over the forming surface of the die at an angle away from parallel to a side edge matching a pitch for coarse threads to be formed by the die. The coarse thread cutter is truncated with a notch within a flattened tip, the notch forming upper portions of crests in the forming surface of the die. A fine thread cutter of circular form is then utilized to cut portions of the root of the dual threaded die. The fine thread cutter is angled relative to side edges of the die at an angle substantially half of an angle at which the coarse thread cutter is angled. The fine thread cutter cuts at a variable depth as the fine thread cutter advances along the root between the crests to form flanks of a bridge within the root.
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