Method for bending metal sheet and device for regulating residual stress
US9610624B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2012 |
| Grant date | Apr 4, 2017 |
| Priority date | — |
| Expiry date | Feb 5, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D5/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A device for regulating a residual stress is comprised of: input means; a residual stress database; a process condition database; first searching means for searching a residual stress (σ0) from the residual stress database; a calculator for calculating a first bending moment (Mrs) in a ridge line originated from the residual stress, and a second bending moment (Mz) in the ridge line originated from bending to obtain a total bending moment (Mrs−Mz) and calculating a camber curvature (ρz) of the workpiece originated from the total bending moment (Mrs−Mz); comparing a difference (|ρz−ρz0|) between the camber curvature (ρz) and a target value (ρz0) with a tolerable value (ρ); second searching means for searching a process condition satisfying a tolerable condition (|ρz−ρz0|≦ρ) from the process condition database when (|ρz−ρz0|>ρ); and regulating means for regulating a residual stress.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.