Process for forming helical screw threads having a flank with ze

Details Process for forming helical screw threads having a flank with ze Process for forming helical screw threads having a flank with ze

1986-10-27

1989-01-24

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

72103, B21H 0300

Patent

active

047993723

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.

REFERENCES:
patent: 594661 (1897-11-01), Smith et al.
patent: 2467302 (1949-04-01), Forster et al.
patent: 3224799 (1965-12-01), Blose et al.
patent: 3446048 (1969-05-01), Marcovitch
patent: 3738139 (1973-06-01), Proops et al.
patent: 4373754 (1983-02-01), Bollfras

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