Method and a punch/die assembly for the production of heat excha

Details Method and a punch/die assembly for the production of heat excha Method and a punch/die assembly for the production of heat excha

1975-08-13

1977-10-25

Gilden, Leon

Metal deforming

With cutting

By composite tool

72335, 72356, B21D 3102

Patent

active

040550672

ABSTRACT:
A method of producing heat exchanger fins, comprising the steps of perforating an aperture of a small diameter in a predetermined portion of a sheet material, while simultaneously forming a perpendicularly projecting cylinder of a diameter smaller than that of the flanged aperture to be ultimately formed, and machining said perpendicularly projecting cylinder into a flange of a predetermined dimension by simultaneous burring and ironing operations using a punch of a predetermined size.

REFERENCES:
patent: 2341462 (1944-02-01), Matson
patent: 3491576 (1970-01-01), Oguri et al.
patent: 3507140 (1970-04-01), Tassaro
patent: 3600998 (1971-08-01), Palmer

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