Ring forming method
US5561999A · kind A · utility
Inventor
Key dates
| Filing date | Dec 15, 1994 |
| Grant date | Oct 8, 1996 |
| Priority date | — |
| Expiry date | Dec 15, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D28/10
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of forming corrugated rings of sheet metal which include the steps of: punching a circular area in the sheet material; punching a plurality of kidney-shaped areas concentrically spaced around the circular hole forming an annular area still connected to the sheet material; deforming the annual area between two mating dies having equal radius radial corrugations therein to corrugate the annual area and concentrically punching the corrugating annular area between a circular punch and a corresponding die, the punch and die having mating cutting surfaces which are corrugated and mate with the corrugated annual area of the sheet thereby forming a circular ring having radial corrugations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.