Method for producing a bumper reinforcement
US6813920B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2003 |
| Grant date | Nov 9, 2004 |
| Priority date | — |
| Expiry date | Jun 11, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49622
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method for producing a bumper reinforcement having a hollow and a substantially rectangular cross sectional shape formed by the steps of providing a straight tubular member and forming a curved bumper reinforcement, continuously; wherein angle portions of the straight tubular member having the radius of curvature established in profiling corner portions of an inner die having the radius established in larger than the radius of the corner portions of the outer die are bulged in a range of relief spaces formed between the corresponding corner portions of the inner die and the outer die to prevent generation of the wrinkles particularly on the angle portions of the straight tubular member while being curved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.