Press-type composite internally and externally threaded portion forming system for manufacture of drum bungs
US11135640B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jan 31, 2019 |
| Grant date | Oct 5, 2021 |
| Priority date | — |
| Expiry date | Aug 29, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D53/24
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a press-type composite internally and externally threaded portion forming system. In this case, the press-type composite internally and externally threaded portion forming system includes an expansion-type collet core unit (10) and a contraction-type collet core unit (20) as its principal components so that internally and externally threaded portions are formed by means of a press method in a composite manner in such a way that the expansion forming force of the expansion-type collet core unit (10) and the contraction forming force of the contraction-type collet core unit (20) simultaneously act on the inner and outer circumferential surfaces of a workpiece in opposite directions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.