Press forming method for metal sheet and frame part for automotive body manufactured thereby
US8511129B2 · kind B2 · utility
1Cited by
28References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2007 |
| Grant date | Aug 20, 2013 |
| Priority date | — |
| Expiry date | Dec 18, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D37/01
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A press forming method for a metal sheet uses dies, a surface roughness of which is an arithmetical mean roughness Ra of 7.5 μm or smaller, which are used as a punch, an upper die, and a blank holder. Fluid with a kinematic viscosity of 500 mm2/s or lower is supplied to a space between a metal sheet and the blank holder, a space between the metal sheet and the punch, and a space between the metal sheet and the upper die. A die is detached from a workpiece in the middle of forming, and resuming the forming.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.