Forming necks on hollow bodies
US4606207A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 1984 |
| Grant date | Aug 19, 1986 |
| Priority date | — |
| Expiry date | Aug 29, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D51/2638
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A thin-walled hollow body open at one end, e.g. a metal can body (76), is given a terminal neck (74) by engaging a primary chuck nose (22) sealingly in the open end and pressurizing the body internally to pre-stress it and hold it against a lift pad (16); the latter is lowered so that the sidewall end portion (80) is progressively rolled by forming rolls (46) to form the neck partly in free space (38) and partly against a secondary chuck nose (30) which maintains the pressure seal when the seal between the sidewall and the primary chuck nose is broken. In a modification, the rolls (46) may be withdrawn early, so as to leave a terminal flange on the can body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.