Method and device for forming a collar on a workpiece
US10118211B2 · kind B2 · utility
Assignees
Inventor
Key dates
| Filing date | Feb 1, 2016 |
| Grant date | Nov 6, 2018 |
| Priority date | — |
| Expiry date | Feb 1, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D22/30
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The problem of achieving great collar lengths with good quality and even when using high-strength metals, in particular high-strength steels, in a simple manner is solved by the disclosed methods and devices. One such method for producing a collar on a workpiece may involve preforming a region of the workpiece to form a material reserve for a collar drawing operation and drawing the workpiece to form a collar such that the drawn workpiece comprises a flange region and a drawn region adjoining the flange region, with the drawn region including a wall region and an adjoining drawn base. At least some material from a region of the material reserve may be used to form the wall region. The method may further involve punching the drawn base such that an opening is made in the drawn base and the wall region is adjoined by a drawn base sub-region, as well as widening the drawn base sub-region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.