Process for forming helical screw threads having a flank with zero or negative inclination
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United States of America Patent
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-
Jan 24, 1989
Grant Date -
N/A
app pub date -
Oct 27, 1986
filing date -
Oct 28, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for forming a helical screw thread comprising a flank with negative inclination on the wall of a rotationally symmetrical body (19) such as a metal pipe or tube. A first phase involves producing a screw thread having flanks with a positive inclination and then a second phase involves modifying the inclination of one of the flanks (24) by plastic deformation to make it negative (32). For that purpose, use is made of a roller (26) mounted on an inclined axis (X2--X2), which rolls against the flank of the thread.
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