EP 0856367 A2 19980805 - Stretch forming metal bodies with polymeric internal mandrels
Title (en)
Stretch forming metal bodies with polymeric internal mandrels
Title (de)
Stretchformung von Metallkörpern mit internen polymerischen Dornen
Title (fr)
Formage par étirage de corps métalliques avec des mandrins interne polymériques
Publication
Application
Priority
- US 3679897 P 19970131
- US 83961697 A 19970415
Abstract (en)
A hollow metal body is shaped by a process including simultaneous stretching and bending. The body is stretched longitudinally by pulling end portions in opposite directions with sufficient force to exceed an elastic limit and to initiate elongation through plastic deformation. While the body is being stretched longitudinally, it is bent between its end portions transversely of the direction of pulling. Solid polymeric first and second mandrels are inserted into end portions of the body to prevent collapse during bending. <IMAGE>
IPC 1-7
IPC 8 full level
B21D 9/00 (2006.01); B21D 9/01 (2006.01); B21D 9/08 (2006.01); B21D 11/02 (2006.01)
CPC (source: EP)
B21D 9/00 (2013.01); B21D 9/08 (2013.01); B21D 11/02 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0856367 A2 19980805; EP 0856367 A3 20010131; JP H10263712 A 19981006
DOCDB simple family (application)
EP 98300707 A 19980130; JP 1946598 A 19980130