Drawing method and drawing die assembly
US7322224B2 · kind B2 · utility
0Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2004 |
| Grant date | Jan 29, 2008 |
| Priority date | — |
| Expiry date | Sep 23, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D22/22
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A drawing method for forming a reflective curved surface by pressing a metal plate fitted in a fixed die with a movable die. The fixed die is composed of a lower die and a core, and the movable die is composed of an upper die and a presser. During the drawing, the metal plate is pressed to have a compressed border portion between a non-pressed portion and a curved surface pressed portion. It is the most desirable to compress the border portion to have a thickness which is 70% of the thickness of the metal plate before drawing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.