Billet and process for producing a tubular body by forced plasti

Details Billet and process for producing a tubular body by forced plasti Billet and process for producing a tubular body by forced plasti

1978-08-31

1980-02-05

Larson, Lowell A.

Metal deforming

By extruding through orifice

Utilizing internal forming means

72370, 29423, 428585, 428586, B21C 2308

Patent

active

041865863

ABSTRACT:
An improved billet and process for producing a tubular body by forced plastic deformation is disclosed. The billet includes a metallic tubular sheath, a metallic center core and a salt intermediate core. The radial thickness of the metallic tubular sheath is equal to or less than 0.11 times the outer diameter of the metallic tubular sheath. The metallic center core is positioned within the tubular sheath and is surrounded by the salt intermediate core which fills the cylindrical space between the tubular sheath and the center core. In the process of the present invention, the foregoing billet is subjected to forced compulsory deformation to reduce the diameter of the billet. Thereafter, the intermediate core is removed through solution and the center core is drawn out of the sheath in order to obtain the tubular body.

REFERENCES:
patent: 1390746 (1921-09-01), Armstrong
patent: 1574551 (1926-02-01), Bumford
patent: 2986810 (1961-06-01), Brick
patent: 3138856 (1964-06-01), Kuchek
patent: 3201858 (1965-08-01), Valyi

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