Integral flanges in a sheet

Details Integral flanges in a sheet Integral flanges in a sheet

1982-08-18

1983-08-16

Hunt, Brooks H.

Stock material or miscellaneous articles

All metal or with adjacent metals

Intermediate article

428599, B21D 2200, B21C 3700, F28F 902

Patent

active

043991963

ABSTRACT:
The method and apparatus for forming flanged holes and a resulting plate and tube assembly of the type used in fluid-to-fluid, such as gas-to-gas, liquid-to-liquid and liquid-to-gas, heat exchangers. A depression is formed with the aid of a punch in a plastically deformable metal sheet such as steel, aluminum, copper and the like, while applying controlled counterpressure with the aid of a larger counterpunch so that material displaced from the space between the punches is laid upon the inner bore of a constraining die. Thus the wall of the depression is formed by purely compressive means. The base of the depression may then be removed to provide deep flanges of controlled dimensions free of cracks or splits.

REFERENCES:
patent: 2909281 (1959-10-01), Koskinen
patent: 3303806 (1967-02-01), Whiteford
patent: 4168619 (1979-09-01), Moore

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