Method & apparatus for shaping a sheet blank
US5426964A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1993 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | Oct 13, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D22/18
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and an apparatus for cold-forming a sheet blank (2') made of a material with an exponential stress-strain behavior to become a thin-walled, hollow shell (2). The sheet blank (2') is clamped in a clamping means (3) with its circumference and rotatingly rotated around its center line (6). The shaping takes place by a first and a second path-controlled press roll (16, 17) engaging at opposite sides of the sheet blank (2') only by local pressure forces, wherein the relative speed between the workpiece (2', 2) and the press rolls and the force exerted by the press rolls to the workpiece are modulated in a manner that the tensile forces applied to the workpiece are below the yield point of the material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.