Cup-shaped member forming apparatus

Details Cup-shaped member forming apparatus Cup-shaped member forming apparatus

2008-04-07

2010-12-07

Jones, David B (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

C072S329000, C072S336000, C072S339000, C072S348000, C072S404000, C413S069000

Reexamination Certificate

active

07845204

ABSTRACT:
A method and apparatus for forming cup-shaped members used in conjunction with a single-acting or a double-acting press having an outer punch assembly, an inner punch assembly and a base. A draw pad and a cutting edge are carried on the outer punch assembly, a draw horn is carried on the inner punch assembly and a blank and draw die is carried on the base. The draw pad and the draw horn oppose the blank and draw die such that the draw pad clampingly engages the blank and draw die in order to exert a clamping pressure on the pressure piston system having first and second pistons vertically stacked with respect to one another. The pressure piston system includes a damping member located within the pressure piston system for continuously increasing the clamping pressure during advancement of the outer punch assembly toward the base of the press.

REFERENCES:
patent: 3902347 (1975-09-01), Ridgway et al.
patent: 4416140 (1983-11-01), Bulso, Jr. et al.
patent: 4516420 (1985-05-01), Bulso et al.
patent: 4549424 (1985-10-01), Bulso et al.
patent: 6032505 (2000-03-01), Stodd
patent: 7000445 (2006-02-01), Hepner et al.

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