초록 ▼

A method of forming a container end panel having a countersink radius and a chuckwall including preforming the radius and the chuckwall so that the chuckwall includes a straight wall portion tangent to the radius and reforming and reducing the radius without tooling restraint while holding pressure

A method of forming a container end panel having a countersink radius and a chuckwall including preforming the radius and the chuckwall so that the chuckwall includes a straight wall portion tangent to the radius and reforming and reducing the radius without tooling restraint while holding pressure against the straight wall area. Apparatus for performing the method includes a punch core and a cooperating die core ring having complimental geometry for forming the chuckwall and radius configuration. The article formed by the method and apparatus includes an end panel having a straight wall portion between the normal tapered wall portion and countersink radius.

대표청구항 ▼

A method of forming a container end piece from a blank of material comprising the steps of: (A) initially forming an end piece having a central panel and a peripheral flange interconnected by a countersink radius adjacent said central panel and a tapered chuckwall leading from said flange to said ra

A method of forming a container end piece from a blank of material comprising the steps of: (A) initially forming an end piece having a central panel and a peripheral flange interconnected by a countersink radius adjacent said central panel and a tapered chuckwall leading from said flange to said radiused area with said wall being tapered toward said central panel for a portion of its length and terminating in a vertical segment adjacent said radiused area; and (B) reforming the end piece initially formed to reduce the radius while maintaining at least a portion of said vertical segment in a vertical condition.