Method of forming a collar for heating exchanger fin and die for

Details Method of forming a collar for heating exchanger fin and die for Method of forming a collar for heating exchanger fin and die for

1989-03-30

1990-09-18

Crane, Daniel C.

Metal deforming

With cutting

By composite tool

72335, B21D 2814, B21D 2826

Patent

active

049569899

ABSTRACT:
A method of forming a collar-shaped protrusion on thin plate material by relatively bringing a forming punch having the outer diameter varying stepwise into the forming hole of a forming die and during forming, punching a small diameter hole by means of a punch-through punch incorporated in said forming die. During the remainder of forming, ironing and burring are performed on the protrusion to form a collar for heat exchanger fins. The die set shaped for carrying out the steps is also included. Since these steps can be performed as a single continuous series of steps, heat exchanger fins of high accuracy can be manufactured with fewer tools, and at less cost and in less time than heretofore.

REFERENCES:
patent: 235353 (1880-12-01), Geldreich
patent: 1690523 (1928-11-01), Bell
patent: 2308953 (1943-01-01), Brown
patent: 3146749 (1964-09-01), Heinle
patent: 4098108 (1978-07-01), Kozima

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