Bent-forming method
US7213437B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 2005 |
| Grant date | May 8, 2007 |
| Priority date | — |
| Expiry date | Jul 14, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D5/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In a first forming step, a metal sheet placed on, and held by a provisional horizontal flat forming portion of a first forming die part is bent along a provisional bend forming portion of the first forming die part to execute bent-forming such that two arch parts of the metal sheet, having respective protuberances oriented in directions opposite from each other, with protuberance surfaces being butted against a provisional inclined flat forming portion of a second forming die part, and a provisional inclined flat forming portion of the first forming die part, respectively, are coupled with each other, thereby obtaining a provisional formed member comprising a provisional inclined flat portion without any warpage, formed continuously from a provisional horizontal flat portion via a provisional bend, and a flange portion formed continuously from the provisional inclined flat portion so as to form a target angle. Subsequently, in a second forming step, the provisional formed member is formed into a target shape by causing the provisional bend to undergo deformation by bending back while bent-forming the provisional horizontal flat portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.