Drawing method and drawing die assembly

Details Drawing method and drawing die assembly Drawing method and drawing die assembly

2008-01-29

2008-01-29

Tolan, Ed (Department: 3725)

Metal deforming

Process

Deforming sheet metal

C072S350000

Reexamination Certificate

active

07322224

ABSTRACT:
A drawing method for forming a reflective curved surface by pressing a metal plate fitted in a fixed die with a movable die. The fixed die is composed of a lower die and a core, and the movable die is composed of an upper die and a presser. During the drawing, the metal plate is pressed to have a compressed border portion between a non-pressed portion and a curved surface pressed portion. It is the most desirable to compress the border portion to have a thickness which is 70% of the thickness of the metal plate before drawing.

REFERENCES:
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patent: 5755134 (1998-05-01), McEldowney
patent: 7082808 (2006-08-01), Knaup
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patent: 2002-316226 (2001-04-01), None
patent: 2002-316226 (2002-10-01), None
Notification of Reasons for Refusal dated Aug. 15, 2005, directed to counterpart Japanese Application No. 2003-324502.

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