Press die designing method using an index value obtained from two stress gradients in sheet thickness direction and gradient of surface stress distribution in direction
US11590591B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2018 |
| Grant date | Feb 28, 2023 |
| Priority date | — |
| Expiry date | Nov 4, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2113/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To prevent a crack from occurring on a sheared end face due to press forming, a technology is provided for evaluating and predicting a crack limit of the sheared end face of a metal sheet and determining press forming conditions. In a deformation limit evaluation method for, when deforming by press forming a metal sheet subjected to shearing, evaluating a deformation limit of the sheared end face of the metal sheet, the deformation limit is evaluated by an index value obtained from two stress gradients at an evaluation position among stress distributions occurring in the vicinity of the sheared end face of the metal sheet due to the press forming, which gradients are a stress gradient in a sheet thickness direction and a stress gradient in a direction away from the sheared end face.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.