Machine for forming spiral grooves in metal pipe inner surface

Details Machine for forming spiral grooves in metal pipe inner surface Machine for forming spiral grooves in metal pipe inner surface

1998-04-10

1999-04-27

Larson, Lewell A.

Metal deforming

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

Spherical tool

B21B 1708

Patent

active

RE0361941

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: 1318962 (1919-10-01), 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 et al.

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