Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Reexamination Certificate
2006-10-10
2006-10-10
Banks, Derris H. (Department: 3725)
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
C072S347000
Reexamination Certificate
active
07117708
ABSTRACT:
A die set for press forming a metal sheet is provided, which comprises: at least a punch; and a die, wherein a punch-die clearance CL2corresponding to a site to be formed immediately after the initial stage of press forming and a punch-die clearance CL1corresponding to a site to be formed in the initial stage of press forming are set so as to satisfy the following expressions (1) and (2), respectively:in-line-formulae description="In-line Formulae" end="lead"?0.8×t≦CL1≦1.2×t (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?CL2≧CL1+t (2)in-line-formulae description="In-line Formulae" end="tail"?where t denotes the thickness of the metal sheet to be formed. This configuration implements a die set for press forming capable of stably generating the reverse bending deformed portion due to overrun even when the die radius is large, minimizing the phenomenon such as wall warp, and enhancing the dimensional accuracy in press forming of a metal sheet, and a press forming method using the die set.
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Iwaya Jiro
Yamano Takayuki
(Kobe Steel, Ltd.)
Banks Derris H.
Bonk Teresa M.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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