EP 2049279 A2 20090422 - METHOD AND APPARATUS FOR CREEP FORMING OF AND RELIEVING STRESS IN AN ELONGATED METAL BAR
Title (en)
METHOD AND APPARATUS FOR CREEP FORMING OF AND RELIEVING STRESS IN AN ELONGATED METAL BAR
Title (de)
VERFAHREN UND VORRICHTUNG ZUR KRIECHBILDUNG UND SPANNUNGSSMINDERUNG BEI EINER LÄNGLICHEN METALLPLATTE
Title (fr)
PROCÉDÉ ET APPAREIL DESTINÉS À EFFECTUER UN FLUAGE ET/OU UNE RELAXATION DES CONTRAINTES DANS UNE BARRE MÉTALLIQUE ÉTIRÉE
Publication
Application
Priority
- US 2007011037 W 20070508
- US 45505206 A 20060615
Abstract (en)
[origin: US2007261463A1] A hot creep stretch wrap forming method includes heating a metal bar to a forming temperature within a temperature range suitable for creep deformation thereof, applying a stretching force to the metal bar at a strain rate no greater than 0.05 inch/inch/second, and wrapping the metal bar around a die, preferably having a thermally and/or electrically insulative work surface. The stretching force is typically applied to a strain ranging from 0.5% to 15.0%. The metal bar most preferably is a titanium alloy with a forming temperature ranging from 0.45 to 0.60 of its melting temperature. The wrapped metal bar is held in position and its temperature maintained within the temperature range typically for 5 to 120 minutes for stress relief. Preferably, the metal bar is held substantially at the forming temperature throughout the process. Thermal insulation around the die and metal bar reduce heat loss from the metal bar.
IPC 8 full level
B21D 11/02 (2006.01); B21D 37/16 (2006.01)
CPC (source: EP KR US)
B21D 11/02 (2013.01 - EP KR US); B21D 25/02 (2013.01 - KR); B21J 1/06 (2013.01 - KR); B21J 13/08 (2013.01 - KR)
Citation (search report)
See references of WO 2007145737A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
US 2007261463 A1 20071115; CN 101466485 A 20090624; EP 2049279 A2 20090422; JP 2009539620 A 20091119; KR 20090018791 A 20090223; WO 2007145737 A2 20071221; WO 2007145737 A3 20080807
DOCDB simple family (application)
US 45505206 A 20060615; CN 200780022015 A 20070508; EP 07756226 A 20070508; JP 2009515392 A 20070508; KR 20087028376 A 20081120; US 2007011037 W 20070508