Method for bending metal plate
US6748788B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2002 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | Sep 25, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D5/01
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Disclosed is a method for bending a metal plate comprising: a first forming step (A) for obtaining a first formed member having a bent portion; and a second forming step (B) for bending the first formed member in a direction of a bending direction of the bent portion so as to allow the bent portion of the first formed member to receive bending-back force. In bending a metal plate by a forming punch relatively moving to a forming die side, the metal plate is bent in an arch shape round the bent forming portion of the forming die. The angle &thgr;p formed between an inclined flat forming portion and a horizontal flat forming portion of the forming die is set to &thgr;p>0, so that the bent arch portion abuts with the inclined flat forming portion of the forming punch and the inclined flat portion of the forming die simultaneously for a certain period of time. This reduces the angle change defect of the bent portion of the formed portion, with no need of changing product shape or of preparing for a special forming die or a facility.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.