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6 records (took 0.063 seconds)

    1.
    发明专利
    未知

    公开(公告)号：BR9206514A

    公开(公告)日：1995-10-31

    申请号：BR9206514

    申请日：1992-10-06

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： GRAFF JOHN M ,  VIOLETTE JOHN A

    IPC: B29C70/86 ,  B29D99/00 ,  B64C11/26 ,  B29D31/00 ,  B29C70/00

    Abstract: A method of manufacturing a lightweight composite propulsor blade of spar and shell construction comprises forming a composite spar (30) having an elongated foam body (20) bonded to a short metal retention tulip (10) and overlayed with a dry braided wrap of angular structural fibers and substantially unidirectional spanwisely aligned structural fiber plies disposed between the braided layers; adding a leading edge foam body (42) and a trailing edge foam body (44) to the spar assembly to form a blade subassembly (50); providing a dry braided fabric wrap over the blade assembly; disposing the fabric covered blade subassembly into a shell molding die and simultaneously impregnating the dry spar fabric wrap and the dry shell fabric wrap with a curable resin material; and curing the impregnated blade subassembly.

    Electroformed sheath
    3.
    发明专利
    Electroformed sheath 未知

    公开(公告)号：GB2298653A

    公开(公告)日：1996-09-11

    申请号：GB9604613

    申请日：1996-03-04

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： GRAFF JOHN M

    IPC: C25D1/10

    Abstract: An electroformed sheath is disclosed for protecting composite components of a part, such as a fan blade of a modern gas turbine engine. The electroformed sheath includes a sheath body having a leading edge; a pressure side and an opposed suction side of the body that meet at the leading edge and extend away from the leading edge to define a sheath cavity therebetween; a head section of the body between the leading edge and the sheath cavity; and an electrically conductive mandrel insert positioned between the pressure and suction sides of the body. In manufacture of the electroformed sheath, the mandrel insert is secured in an appropriate mandrel having an exterior surface approximating the blade's airfoil configuration. The leading edge, head section and pressure and suction sides are electroplated around the mandrel insert so that the insert remains in the sheath body after removal of the mandrel. The position occupied by the mandrel defines the sheath cavity, and the component parts of the blade are secured within the cavity. The mandrel insert enhances electroformation of material from the electroplate bath around the mandrel insert so that the resulting electroformed sheath has a thickness range ratio (being a ratio of the thickness of a thickest part of the sheath (e.g., its leading edge) to the thickness of a thinnest part of the sheath (e.g., trailing edges of the pressure or suction sides)) in excess of 30:1.

    REDUCED STRESS AIRCRAFT PROPELLER BLADE ROOT STRUCTURE
    4.
    发明专利
    REDUCED STRESS AIRCRAFT PROPELLER BLADE ROOT STRUCTURE 未知

    公开(公告)号：CA1165299A

    公开(公告)日：1984-04-10

    申请号：CA390158

    申请日：1981-11-16

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： NUTTER HARRY A JR ,  GRAFF JOHN M

    IPC: B64C11/22 ,  B64C11/20 ,  B64C11/16

    Abstract: A propeller blade of the type having an airfoil shell bonded to a spar received within the interior of the shell is provided with a shell closure member which covers the root end of the shell and includes an opening therein which receives the spar. The closure member enhances the structural integrity of the shell, redistributing and minimizing stresses in the shell root and includes a collar upstanding therefrom, the spar being received through the collar and bonded to the inner surface thereof, thereby increasing the area of the shell-to-spar bond for stress reduction therein.

    Electroformed sheath
    6.
    发明专利
    Electroformed sheath 未知

    公开(公告)号：GB2298653B

    公开(公告)日：1998-08-19

    申请号：GB9604613

    申请日：1996-03-04

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： GRAFF JOHN M

    IPC: C25D1/10

    Abstract: An electroformed sheath is disclosed for protecting composite components of a part, such as a fan blade of a modern gas turbine engine. The electroformed sheath includes a sheath body having a leading edge; a pressure side and an opposed suction side of the body that meet at the leading edge and extend away from the leading edge to define a sheath cavity therebetween; a head section of the body between the leading edge and the sheath cavity; and an electrically conductive mandrel insert positioned between the pressure and suction sides of the body. In manufacture of the electroformed sheath, the mandrel insert is secured in an appropriate mandrel having an exterior surface approximating the blade's airfoil configuration. The leading edge, head section and pressure and suction sides are electroplated around the mandrel insert so that the insert remains in the sheath body after removal of the mandrel. The position occupied by the mandrel defines the sheath cavity, and the component parts of the blade are secured within the cavity. The mandrel insert enhances electroformation of material from the electroplate bath around the mandrel insert so that the resulting electroformed sheath has a thickness range ratio (being a ratio of the thickness of a thickest part of the sheath (e.g., its leading edge) to the thickness of a thinnest part of the sheath (e.g., trailing edges of the pressure or suction sides)) in excess of 30:1.

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