Method and apparatus for hot die draw forming metal sheets
US5035133A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1990 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Feb 9, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D25/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for draw forming a metal sheet over a male form to produce a three-dimensional shape. A sheet of metal is clamped between upper and lower draw plates positioned above the male form. The upper plate has an edge conforming to the male form shape. The plates and sheet are moved downwardly over the form with the edge of the upper plate firmly pressing the sheet against the form. The clamping pressure between the draw plates allows suitable slippage as drawing proceeds to produce a drawn shape of intended thickness. The drawn shape has a configuration conforming to the outer surface of the male form and has an outer surface of improved uniformity and appearance due to the wiping action of the upper plate edge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.