(19)
(11) EP 2 859 969 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.04.2015 Bulletin 2015/18

(43) Date of publication A2:
15.04.2015 Bulletin 2015/16

(21) Application number: 14185162.6

(22) Date of filing: 17.09.2014
(51) International Patent Classification (IPC): 
B22D 15/00(2006.01)
B22D 19/16(2006.01)
F01D 5/02(2006.01)
 B22D 27/20(2006.01)
B22D 19/00(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 08.10.2013 US 201314048767

(71) Applicant: Honeywell International Inc.
Morristown, NJ 07962-2245 (US)

(72) Inventors:
  • Woodward, John
    Morristown, NJ New Jersey 07962-2245 (US)
  • Bedford, Paul
    Morristown, NJ New Jersey 07962-2245 (US)

(74) Representative: Houghton, Mark Phillip 
Patent Outsourcing Limited 1 King Street
Bakewell, Derbyshire DE45 1DZ
Bakewell, Derbyshire DE45 1DZ (GB)

   


(54) Process for making a turbine wheel and shaft assembly


(57) A process for making a turbine rotor includes steps of providing a shaft made of a first metal composition and having an integral pin projecting axially therefrom, providing a mold that defines a cavity for investment casting a turbine wheel, disposing the pin within the cavity of the mold, pre-heating the mold and the pin to a mold temperature, pouring a molten second metal composition into the cavity of the pre-heated mold such that the molten second metal composition envelopes the pin within the cavity, and controlling the process so that the pin acts as a chill member causing the second metal composition around the chill member to solidify with a finer equiaxed grain structure than would be the case without the chill member. The turbine wheel is joined to the shaft via the casting of the turbine wheel about the pin.







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