| 摘要 |
Method and apparatus for forming or reforming the shell of a two-piece container includes forming a cup shaped member in an upside down condition, reverse drawing the shell to form an over length chuckwall loosely holding the shell while pulling the excess material from the chuckwall into the bottom panel of the shell. The apparatus comprises tooling incorporated into a double acting press and including a punch core carried by the inner ram and an opposed die core carried by the bottom platen, a first pressure member carried by the outer ram and a die core ring fluidly supported on the bottom platen opposed to the pressure member and a punch shell carried on the inner ram. A second fluid pressure sleeve means is carried on the bottom platen in opposed relationship to the punch shell and a knockout piston is also carried by the lower platen opposed to the punch core and encircling the die core. The tooling is arranged such that the first pressure sleeve holds the material against the die core ring under fluid pressure while the punch shell draws the material over the die core ring to preliminarily form the chuckwall. The second pressure sleeve is movable into engagement with the die core ring under pressure from the punch shell so that, as the punch core terminates its travel, holding pressure is reduced as the over length material is pulled into the central area of the end panel. |
