EP 2027299 A1 20090225 - METHOD OF INTRODUCING RESIDUAL COMPRESSIVE STRESSES INTO A SHAFT, IN PARTICULAR INTO SHAFT NOTCHES
Title (en)
METHOD OF INTRODUCING RESIDUAL COMPRESSIVE STRESSES INTO A SHAFT, IN PARTICULAR INTO SHAFT NOTCHES
Title (de)
VERFAHREN ZUM EINBRINGEN VON DRUCKEIGENSPANNUNGEN IN EINE WELLE, INSBESONDERE IN WELLENKERBEN
Title (fr)
PROCÉDÉ POUR INTRODUIRE DES TENSIONS PROPRES DE PRESSION DANS UN ARBRE, NOTAMMENT DANS DES RAINURES D'ARBRE
Publication
Application
Priority
- EP 2007051744 W 20070223
- EP 06011627 A 20060606
- EP 07712293 A 20070223
Abstract (en)
[origin: EP1865080A1] The manufacture of shafts useful in steam turbine, comprises arranging diameter transitions (3) and/or notch area between neighboring steps (2) of the shaft, controllably quenching the diameter transitions and/or notch area within a framework of a thermal treatment of the shaft, spraying the diameter transitions and/or notch area for quenching purposefully with a quenching medium, and cooling the diameter transitions and/or notch area by a dipping procedure. The shafts are implemented as stepped shafts with sequential steps of different diameter. The manufacture of shafts useful in steam turbine, comprises arranging diameter transitions (3) and/or notch area between neighboring steps (2) of the shaft, controllably quenching the diameter transitions and/or notch area within a framework of a thermal treatment of the shaft, spraying the diameter transitions and/or notch area for quenching purposefully with a quenching medium, and cooling the diameter transitions and/or notch area by a dipping procedure. The shafts are implemented as stepped shafts with sequential steps of different diameter. The diameter transitions and/or notch area are manufactured with an oversize (8) provided on a final end contour (7) and have a radius of 25-50 mm in its thermal treatment contour. The thermal treatment contour (6) is removed during the production of the final end contour and/or after quenching. The oversize has a value of 10-40 mm related to the final end contour of the wave.
IPC 8 full level
C21D 9/28 (2006.01); B23P 25/00 (2006.01)
CPC (source: EP US)
C21D 9/28 (2013.01 - EP US)
Citation (search report)
See references of WO 2007141055A1
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 NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
EP 1865080 A1 20071212; CN 101460639 A 20090617; CN 101460639 B 20121010; EP 2027299 A1 20090225; JP 2009540114 A 20091119; JP 5377297 B2 20131225; US 2009145527 A1 20090611; WO 2007141055 A1 20071213
DOCDB simple family (application)
EP 06011627 A 20060606; CN 200780020827 A 20070223; EP 07712293 A 20070223; EP 2007051744 W 20070223; JP 2009513613 A 20070223; US 22792607 A 20070223