Roller hemming
US9440278B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 12, 2013 |
| Grant date | Sep 13, 2016 |
| Priority date | — |
| Expiry date | Jun 27, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D37/16
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Methods and apparatuses for roller hemming are disclosed herein. An example of a sheet metal roller hemming apparatus includes a first electrode to electrically connect to an electrical power supply and a sheet metal workpiece. The apparatus further includes a second electrode to electrically connect to the electrical power supply and the sheet metal workpiece to cause pulsed electric current to flow through a portion of the workpiece to locally increase formability in the portion of the workpiece. The apparatus still further includes a roller assembly to contact the workpiece to cause the workpiece to bend in the portion of the workpiece when the pulsed electric current is flowing through the portion of the workpiece, and to form a hem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.