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

1978-03-16

1980-01-22

Gilden, Leon

Metal deforming

With cutting

By composite tool

72349, 72370, B21D 3102

Patent

active

041843550

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 projecting cylinder of a diameter smaller than that of the flanged aperture to be ultimately formed, and machining the projecting cylinder into a flange of a predetermined dimension by simultaneous burring an ironing operations using a punch of a predetermined size.

REFERENCES:
patent: 1688111 (1928-10-01), Bohle
patent: 1724486 (1929-08-01), Karmazi

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