Method and apparatus for press forming sheet material

Details Method and apparatus for press forming sheet material Method and apparatus for press forming sheet material

2011-05-31

2011-05-31

Tolan, Edward (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

C072S333000, C072S399000

Reexamination Certificate

active

07950261

ABSTRACT:
A press forming apparatus comprises an upper die provided with an upper drawing die, a punch, an upper movable blank holder, and a trimming member and a lower die provided with a lower drawing die, a die, an outer periphery drawing die, and a lower movable blank holder. The upper die is lowered with respect to the lower dye, and the outer periphery portion of a blank is held by the trimming member and the upper blank holder. The central portion of the blank is drawn by the upper and lower drawing dies. The outer periphery portion of the blank is trimmed by the trimming member and the outer periphery drawing die, and drawing of the outer periphery portion of the blank is started by the upper drawing die and the outer periphery drawing die.

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