Die set for manufacturing heat exchanging fin of heat exchanger

Details Die set for manufacturing heat exchanging fin of heat exchanger Die set for manufacturing heat exchanging fin of heat exchanger

1997-03-18

1998-08-25

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

With stripping or ejecting from tool

72334, 72356, B21D 4506

Patent

active

057972915

ABSTRACT:
The die set manufactures a heat exchanging fin by the steps of: forming a projected section in a thin metal plate; drawing the projected section, once or a plurality of times, to reduce the diameter thereof and to form the projected section into a cylindrical section; and piercing and barring the cylindrical section to form into a collar section through which a heat exchanging pipe is pierced. The die set comprises: a lower die; an upper die having a die hole whose diameter is shorter than the bottom diameter of the projected section not drawn; a punch being provided in the lower die; and a lifter being provided in the lower die, the lifter being biased toward the upper die by elastic means, the lifter having a through-hole through which the punch passes and an accommodating space for accommodating a slackened section of the projected section, which is formed in the vicinity of a base thereof while drawing the projected section.

REFERENCES:
patent: 4118968 (1978-10-01), Ames

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