Method for bending tubes

Details Method for bending tubes Method for bending tubes

1989-05-15

1992-09-01

Sipos, John

Metal deforming

By deflecting successively-presented portions of work during...

By use of work-contacting wiper and moving, work-holding form

72149, 72369, 72370, B21D 1106, B21D 704, B21D 904

Patent

active

051428954

ABSTRACT:
The method of bending relatively thin wall tubing to form a tubular heat exchanger that has relatively tight bends with controlled wrinkles. For example, 1.75-inch outer diameter stainless steel tube may have a wall thickness of 0.035 inches and be bent using a controlled-wrinkle bend die to a 180.degree. bend having a centerline radius of 2.5 inches.

REFERENCES:
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patent: 2012766 (1935-08-01), Meyer
patent: 2126235 (1938-08-01), Wesley
patent: 2223015 (1940-11-01), Hathorn
patent: 2310091 (1943-02-01), Kepler
patent: 2357873 (1944-09-01), Bower
patent: 2406838 (1946-09-01), Kepler
patent: 3408844 (1968-11-01), Strachauer et al.
patent: 3456482 (1969-07-01), Maier et al.
patent: 3472056 (1969-10-01), Gregg
patent: 4009601 (1977-03-01), Shimizu
U.K. Patent Application No. GB 2,205,260 A, Pub. Dec. 7, 1988.
DL 50,195 published Oct. 1966; East Germany; 8 sheet drwg & 4 pp. of spec.

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