Global Patent Index - EP 2027299 A1

EP 2027299 A1 2009-02-25 - 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

EP 2027299 A1 (DE)

Application

EP 07712293 A

Priority

  • EP 2007051744 W
  • EP 06011627 A
  • EP 07712293 A

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 (invention and additional information)

C21D 9/28 (2006.01); B23P 25/00 (2006.01)

CPC (invention and additional information)

C21D 9/28 (2013.01)

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

EPO simple patent family

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

INPADOC legal status


2010-05-19 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20091124

2009-04-22 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20090324

2009-04-01 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: BRAENDLE, MICHAEL

2009-04-01 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: KERN, TORSTEN-ULF

2009-04-01 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: RICHTER, CHRISTOPH

2009-02-25 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20081014

2009-02-25 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): 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

2009-02-25 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Countries: AL BA HR MK RS