Method of producing shaped steel changing in cross-sectional shape in longitudinal direction and roll forming apparatus for same
US9878360B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2013 |
| Grant date | Jan 30, 2018 |
| Priority date | — |
| Expiry date | Oct 18, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D5/083
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A roll forming apparatus for roll forming for producing from a sheet material a shaped steel which varies in cross-sectional shape in a longitudinal direction comprises a first rolling die which has an annular ridge part which varies in cross-sectional shape in a circumferential direction; a second rolling die which has an annular groove part which varies in cross-sectional shape in a circumferential direction; and a drive device for the first rolling die and the second rolling die. At least transition parts of the side surfaces of the annular ridge part of the first rolling die are provided with relief so that the gap with respect to the side surfaces of the annular groove part of the second rolling die becomes broader inward in the radial direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.