Method of redrawing metal cup
US5105645A · kind A · utility
36Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1990 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Nov 13, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D22/22
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Disclosed is a method of redrawing a metal cup, in which an annular working member is used together with a redrawing die, a redrawing punch and a cup-shaped holding member, and this annular working member has a working face having an inner diameter smaller than the outer diameter of a preliminarily drawn cup to be redrawn. If redrawing is carried out by using this annular working member, the thickness of the drawn cup can be uniformly and sufficiently reduced without damaging a metal sheet of the preliminarily drawn cup or a coating layer thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.