Method of forming a deep-drawn and ironed container
US4732031A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1987 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Apr 20, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D22/28
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of forming a deep-drawn and ironed container having a bottom profile wherein a cup is formed by drawing an inverted cup and reverse drawing the cup and simultaneously imparting a bottom profile thereto while controlling the thickness of the material in the bottom. The method also includes providing support to the profiled bottom while ironing the cup thus formed. The method is accomplished by a system which includes a draw-redraw station wherein the inverted cup is adjustably held by a fluidly actuated lift out ring and draw pad in the bottom area against a punch during reverse drawing to control metal thickness in the bottom. A separate pressure sleeve is also engaged with the profiled bottom during ironing to prevent pulling material from the bottom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.