Shell reforming method and apparatus

Apparatus for forming a container end panel in a double acting press having movable inner and outer rams and a fixed platen, comprising:

• (a) a punch core carried by the inner ram and die core carried by the fixed platen arranged in opposed relationship to said punch core;
• (b) first pressure means carried by the outer ram and a die core ring carried by the fixed platen arranged in opposed relationship to said first pressure means;
• (c) said first pressure means normally holding the end panel against said die core ring;
• and
• (d) said first pressure means moved by said outer ram into engagement with said die core ring whereby continued movement of said outer ram causes said first pressure means and said die core ring to move together relatively of said fixed die core to reduce holding pressure on said end panel.

Apparatus for forming the end panel of a container, in a double acting press having movable inner and outer rams and a fixed platen, from a flat sheet of material, comprising:

• (a) a punch core carried on the inner ram;
• (b) a fixed die core carried on the platen in opposed relationship to said punch core;
• (c) a first pressure sleeve system carried on the outer ram;
• (d) a die core ring supported on the platen in opposed relationship to said pressure sleeve system;
• (e) a punch shell carried on the inner ram;
• (f) second pressure sleeve means carried on the platen in opposed relationship to said punch shell;
• (g) a fluid operated knockout piston carried by the platen in opposed relationship to said punch core and in encircling relationship with said die core;
• (h) said first pressure sleeve system holding said material against said die core ring under fluid pressure;
• (i) said punch shell drawing the material over said die core ring to form a reverse cup and forcing said second pressure sleeve downward into mechanical engagement with said die core ring upon movement of the outer ram toward the platen;
• (j) said punch core forcing said knockout piston downwardly upon movement of the inner ram toward the platen and drawing the material over the draw core ring to form an overlength chuckwall in the end panel;
• and
• (k) said second pressure sleeve means, said first pressure sleeve system, and said die core ring movable downwardly in unison relatively of said fixed die core as said punch core approaches its extended position to shorten the chuckwall and force metal into the central portion of the end panel.