Method for vaccum assisted preforming of superplastically or...

Details Method for vaccum assisted preforming of superplastically or... Method for vaccum assisted preforming of superplastically or...

2008-04-29

2008-04-29

Jones, David B (Department: 3725)

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

C072S060000, C072S709000, C029S421100

Reexamination Certificate

active

07363790

ABSTRACT:
Method of preforming and forming a sheet metal article from a preheated blank of sheet metal uses opposing dies including a punch having a punch surface defining a final configuration for the article and a cavity die having a cavity surface defining a preform configuration. The blank is placed between the dies and has a first side surface facing the cavity die and a second side surface facing the punch. A vacuum is applied to the first side of the blank to draw and shape the blank into the cavity die to a preform configuration conforming to the cavity surface. The punch and the cavity die are then closed toward one another and gas pressure is then applied to the first side surface of the blank to press the second side surface against the punch surface to the finish configuration.

REFERENCES:
patent: 4045986 (1977-09-01), Laycock et al.
patent: 5647239 (1997-07-01), Fischer
patent: 5823032 (1998-10-01), Fischer
patent: 6253588 (2001-07-01), Rashid et al.
patent: 6581428 (2003-06-01), Friedman
patent: 6832501 (2004-12-01), Gruszka et al.
patent: 6880377 (2005-04-01), Kim et al.
patent: 6886383 (2005-05-01), Kim et al.

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