Punch die and punch machine using the same

Details Punch die and punch machine using the same Punch die and punch machine using the same

2008-09-15

2011-11-01

Ekiert, Teresa (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

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

C072S354200

Reexamination Certificate

active

08047043

ABSTRACT:
An exemplary punch die (30) includes a lower die (40) and an upper die (50). The lower die includes a die core (45), a blank holder (417), and a cylinder (413) disposed in the lower die. The blank holder is disposed on a periphery of the die core. The cylinder is connected to the blank holder and provides a constant force to the blank holder. The upper die includes a punch core corresponding to the die core. A punch machine using the present punch die is also provided.

REFERENCES:
patent: 4841622 (1989-06-01), Murano et al.
patent: 4905556 (1990-03-01), Haack et al.
patent: 6178801 (2001-01-01), Ishida
patent: 03297532 (1991-12-01), None

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