Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Reexamination Certificate
2011-03-08
2011-03-08
Tolan, Edward (Department: 3725)
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
C072S347000
Reexamination Certificate
active
07900492
ABSTRACT:
An addendum shape portion of a panel material is drawn by a drawing portion of a press forming die by an amount equal to or less than the limit to which the panel material can be drawn, whereby a to-be-product portion of the panel material is roughly conformed to a forming face of a punch. In this state, the to-be-product portion of the panel material is stretched or drawn. Accordingly, the cross section of the to-be-product portion is uniformly changed at the minimum level, which makes it possible to produce, by press forming, a fender panel made of aluminum base alloy, which has a great plane dimension L and high quality. As a result, flexibility in the design of panel parts, which are formed by pressing the panel material into shapes, is increased.
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Finnegan Henderson Farabow Garrett & Dunner LLP
Tolan Edward
Toyota Jidosha & Kabushiki Kaisha
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