Method and apparatus for forming internal threads in tubes

Metal deforming – By use of tool acting during relative rotation between tool... – Tool orbiting or rotating about an axis

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10107PH, 10129WH, 10130WH, 72316, 414748, B21H 308

Patent

active

044571534

ABSTRACT:
A method and apparatus for forming internal threads on tubular components by a non-cutting process is disclosed. Various disclosed features find particular utility when using a thread forming or rolling tap process to form internal threads on sucker rod coupling tubes. In the preferred embodiment, a machine is disclosed utilizing a movable fixture head (34) capable of simultaneously threading one or more tubes (12, 12') of various sizes. A single hydraulic cylinder (59) moves the fixture head to various positions relative to the work stations (14, 16) to control several operational steps including the sequential feed of the tubes (12) to the work stations (14, 16), clamping/unclamping of the tubes during the tapping process, and retention of the tap (204) while the threaded tubes are removed from the work stations.

REFERENCES:
patent: 899915 (1908-09-01), Smith
patent: 2704848 (1955-03-01), Straty
patent: 3056983 (1962-10-01), Devereux et al.
patent: 3246733 (1966-04-01), Torbet et al.
patent: 4314471 (1982-02-01), Lukach

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