(19)
(11) EP 2 759 359 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.01.2018 Bulletin 2018/01

(43) Date of publication A2:
30.07.2014 Bulletin 2014/31

(21) Application number: 13194178.3

(22) Date of filing: 23.11.2013
(51) International Patent Classification (IPC): 
B22C 9/10(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: 23.01.2013 US 201313747653

(71) Applicant: Sikorsky Aircraft Corporation
Stratford, CT 06615 (US)

(72) Inventors:
  • Song, Shihong G.
    Chesihre, CT Connecticut 06410 (US)
  • Giampapa, James S.
    Oxford, CT Connecticut 06478 (US)
  • Meeson Jr., John H.
    Trumbull, CT Connecticut 06611 (US)

(74) Representative: Schmitt-Nilson Schraud Waibel Wohlfrom Patentanwälte Partnerschaft mbB 
Destouchesstraße 68
80796 München
80796 München (DE)

   


(54) Quasi self-destructive core for investment casting


(57) A composite core for forming a passage in an investment casting mold is provided including a generally hollow structural element. The structural element is configured to deform when a force is applied to an end thereof. A rigid shell element is formed about the structural element. The shell element extends beyond both an interior surface and an exterior surface of the structural element. The shell element is configured to shatter when the structural element deforms.







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