Rolling mill for reducing the thickness of the wall of a tube

Details Rolling mill for reducing the thickness of the wall of a tube Rolling mill for reducing the thickness of the wall of a tube

1983-11-18

1986-07-29

Larson, Lowell A.

Metal deforming

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

With tool surface orbiting around axis parallel to direction...

72126, B21B 1912

Patent

active

046024930

ABSTRACT:
A method of reducing the thickness of the wall of a tube wherein in the zone of the reduction of the wall thickness, on the internal surface of the tube the plug of a mandrel exerts a pressure causing an increase of the inner diameter, and on the external surface rolls exert a pressure securing invariability of the outer diameter of the tube.
A rolling mill for reducing the thickess of the wall of a tube comprises a extension plug (4) mounted on a mandrel (1) and working rolls (6) which in the zone of the reduction of the wall of the tube (2) have the surface of the roll face parallel to the axis of the tube (2). Bearings (7) of working rolls (6) are radially-slidably mounted in the planetary cage (8).

REFERENCES:
patent: 389585 (1888-09-01), Mannesmann
patent: 644919 (1900-03-01), Illingworth
patent: 1368413 (1921-02-01), Stiefel
patent: 1596751 (1926-08-01), Millspaugh
patent: 1874995 (1932-08-01), Heinauer
patent: 1990607 (1935-02-01), Kocks
patent: 2164724 (1939-07-01), Severin
patent: 2179918 (1939-11-01), Brock
patent: 3503238 (1970-03-01), Marcovitch
patent: 3718020 (1973-02-01), Leitner
patent: 3735617 (1973-05-01), Bretschneider
patent: 4212178 (1980-07-01), Bretschneider

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