Method and apparatus for forming container end panels
US4716755A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1986 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | Jul 28, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D51/44
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of forming a container end piece includes blanking a work piece from a sheet of material and forming an inverted cup therefrom by wiping the peripheral edge of the blank over a die core ring. The inverted cup is then reversed by advancing a punch core and a punch core ring simultaneously to form a cup having a flange area, a central body area and a chuckwall area interconnecting the flange and the bottom. The punch core ring is then advanced ahead of the punch core to shorten the chuckwall area and reduce the radius between the chuckwall and the central bottom portion. The method also includes engaging the flange area of the reversed cup by a pressure sleeve which moves downwardly with the punch core ring during the final forming of the chuckwall. The apparatus includes a press having a fixed base and movable platen wherein a punch shell is carried by the movable platen and a punch core ring is carried by the fixed base so that upon movement of the punch shell toward the fixed base, the peripheral edge of the blank is wiped over the die core ring to form the inverted cup. The punch core and punch core ring are also carried by the movable platen, with the punch core being a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.