Pipes and tubular conduits – Combined – With end structure
Patent
1986-12-19
1988-05-31
Larson, Lowell A.
Pipes and tubular conduits
Combined
With end structure
138177, F16L 900
Patent
active
047474319
ABSTRACT:
A method of fabricating a tube having enlarged ends and made of material which can be strengthened by cold working comprises fabricating a pre-form having the overall configuration of the tube but with increased outside diameters and a decreased length. The pre-formed tube is cold forged or cold rolled over its entire length to reduce its outside diameter while maintaining its inside diameter substantially fixed. This elongates the tube and reduces its cross-sectional area. Cold working is continued until the final desired dimensions for the tube are reached. This produces a strengthening effect by cold working over the entire length of the tube.
REFERENCES:
patent: 2023727 (1935-12-01), Esser
patent: 2361318 (1944-10-01), Orr et al.
patent: 3357458 (1967-12-01), Radd et al.
patent: 4151012 (1979-04-01), Simkovich et al.
Holbrook Richard L.
Kahlow, deceased Kurt J.
LaCount Dale F.
Mayer Dean L.
Edwards Robert J.
Larson Lowell A.
Matas Vytas R.
The Babcock & Wilcox Company
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