| 摘要 |
Apparatus and method for forming cup-shaped metal container bodies or end shells from a metal blank in a double-acting press having inner and outer rams which operate in a timed relationship. Preferably, a plurality of blank and draw dies are mounted on a fixed base in opposed relationship to a plurality of draw horns mounted on the inner ram and movable toward the base. A corresponding member of cutting dies and draw pads are mounted on the outer ram and are movable toward the base, whereby the cutting dies cut blank disks from the sheet and the draw pads clamp the disks against the blank and draw dies, followed by the drawing of the container bodies or end shells by the draw horns. A plurality of stacked pressure-actuated pistons is carried by each of the outer rams and moves the draw pad into clamping engagement with the periphery of the blank disk. Spacings are provided between the individual pistons so that the clamping pressure is applied sequentially and cumulatively to the draw pad until the desired total clamping pressure is reached to reduce the impact forces and vibrations on the press, which occurs when the total clamping force is applied instantaneously to the disk blank.
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