Closed structure parts, method and press forming apparatus for manufacturing the same
US9162272B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2009 |
| Grant date | Oct 20, 2015 |
| Priority date | — |
| Expiry date | Sep 24, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB30B7/04
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method for manufacturing a closed structure part has a closed section using a blank made from a metal plate by pressing the blank using a press forming die and fixing a pair of joint ends of the blank to each other, the method including a pre-forming step of processing the blank into an interim part having a closed section corresponding to the closed structure part, a closing step of, after the pre-forming step is completed, moving the joint ends of the interim part toward each other and urging, against one of the joint ends, a concave flange processing portion formed on one of a pair of press forming surfaces of the press forming die at the edge end adjacent to the other press forming surface, and a press joining step of, after the closing step is completed, further moving the press forming die in a pressing direction, bending the one of the joint ends using a pressing force applied from the flange processing portion so that the joint end overlaps the outer surface of the other join end and a latch flange portion for latching the other joint end is formed and, simultaneously, pressing the blank using the pair of press forming surfaces and press-forming outer portions of the pair…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.