Forming method and forming device
US9192972B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2011 |
| Grant date | Nov 24, 2015 |
| Priority date | — |
| Expiry date | Nov 15, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D5/12
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An object of the present invention is to provide a forming method and a forming machine in which in forming e.g., a round steel pipe, predetermined forming can be performed with less additional deformation imparted to a workpiece without deteriorating the productivity of the conventional roll forming, thereby manufacturing a high-quality product with high dimension precision. To achieve this object, the present invention provides a forming method and a forming machine, which adopt a rotating unit which rotatably moves on an endless track a die train having dies with outwardly directed and swingable forming passes in a breakdown step at an early forming stage, and in which the forming pass of each die holds the edge of the workpiece to rotatably move the die by changing the die to a predetermined angle, thereby realizing bending, so that problems due to twisting onto forming rolls and high locally-caused contact stress can be greatly reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.