Metal deforming – With cutting – By composite tool
Patent
1977-03-14
1978-08-29
Gilden, Leon
Metal deforming
With cutting
By composite tool
72335, 72356, 72370, B21D 3102
Patent
active
041095014
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: 2157354 (1939-05-01), Sherman
patent: 2367121 (1945-01-01), Hill
patent: 3412593 (1968-11-01), Price
Gilden Leon
Hidaka Engineering Co., Ltd.
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