Machine for forming spiral grooves in metal pipe inner surface

Metal deforming – By use of tool acting during relative rotation between tool... – Spherical tool

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Details

72278, 72283, 72 78, 72370, B21B 1708, B21C 124

Patent

active

043733662

ABSTRACT:
An improved machine for forming a plurality of thin, spiral grooves in the inner surface of a metal pipe. A grooving plug is inserted and held in the metal pipe in such a manner that its axial position is constant and the metal pipe, while being moved longitudinally, is pressed by a plurality of balls which rotate planetarily around the outer surface of the metal pipe at a position corresponding to the position of the grooving plug to continuously form a plurality of spiral grooves in the inner surface of the metal pipe. Thereafter, the metal pipe is finished through a die. The machine manufactures at a high rate metal pipe which has a smooth outer surface and a grooved inner surface.

REFERENCES:
patent: 1143101 (1915-06-01), Brinkman
patent: 1414500 (1922-05-01), Brinkman
patent: 1440527 (1923-01-01), Brinkman
patent: 3924434 (1975-12-01), Fulier
patent: 4306437 (1981-12-01), Javorik

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