Die set

Details Die set Die set

1995-01-11

1997-02-11

Crane, Daniel C.

Metal deforming

By use of closed-die and coacting work-forcer

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

723532, 723554, 72356, B21D 2200

Patent

active

056009925

ABSTRACT:
An object of the present invention is to provide a die set, which is capable of removing the influence of heat expansion and the change of the number of the collared holes and improving the accuracy of the collar height. In a die set including an upper die and a lower die wherein a metal plate having a collared hole is provided between the dies to form a flange section at an end of the collar, a flare-punch is provided to the upper die and is capable of vertically moving therein. The flare-punch has a flange forming section for forming the flange section. A biasing member biases the flare-punch toward the lower die. A level pin for defining a lower dead point of the flare-pin is provided to the lower die. The level pin is capable of coming into contact with the flare-punch, which has been in the collar, when the upper die and the lower die are closed.

REFERENCES:
patent: 3124876 (1964-03-01), Putetti
patent: 4055067 (1977-10-01), Kozima
patent: 4667394 (1987-05-01), Bode et al.
patent: 4667499 (1987-05-01), Bull
patent: 4956989 (1990-09-01), Nakajima
patent: 5115663 (1992-05-01), Ando et al.

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