Die set for manufacturing fins of heat exchangers and a manufact

Details Die set for manufacturing fins of heat exchangers and a manufact Die set for manufacturing fins of heat exchangers and a manufact

1991-07-11

1992-11-03

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

72335, B21D 5304

Patent

active

051598264

ABSTRACT:
A die set for forms fins of heat exchangers and a manufacturing device using the die set. The die set for manufacturing fins of heat exchangers, comprising a punch and a die for forming a projected section, which is formed along an edge of a hole bored in a metal plate, into a collar with a prescribed height. The die has a hollow section into which the punch is capable of entering and the outer circumferential face of the punch is a tapered face in the form of a truncated cone. The tapered face faces the inner face of the die when the upper end section of the punch proceeds beyond the upper end of the projected section, which is held between the outer circumferential face of the punch and the inner face of the die, and the projected section so held is extruded by reduction of the distance between the outer circumferential face of the punch and the inner face of the die, which hold the projected section therebetween, caused by movement of the tapered face of the punch into the hollow section of the die.

REFERENCES:
patent: 2821156 (1958-01-01), Lyon
patent: 2861335 (1958-11-01), Huet
patent: 3116542 (1964-01-01), Niekamp
patent: 3146749 (1964-09-01), Heinle
patent: 4055067 (1977-10-01), Kozima
patent: 4956989 (1990-09-01), Nakajima

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