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Method for machining a gas turbine rotor

  • US 8,281,486 B2
  • Filed: 11/16/2009
  • Issued: 10/09/2012
  • Est. Priority Date: 11/19/2008
  • Status: Expired due to Fees
First Claim
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1. A method for machining a gas turbine rotor (10) having a cooling air slot (19, 19

  • ), which concentrically extends around an axis (18) of the gas turbine rotor (10) and is supplied with compressed cooling air via axial cooling air holes (14), which at a side of the gas turbine rotor lead into a slot base (16) of the cooling air slot (19, 19

    ), and an opening of the cooling air slot is covered by bridges (36) which are arranged in a distributed manner over a circumference of the gas turbine rotor and spaced apart from each other by gaps (38), the method comprising;

    lowering a material-removing tool (22, 25) in the gaps (38) between the bridges (36) one after the other into the cooling air slot (19, 19

    );

    machining the slot base (16) of the cooling air slot (19, 19

    ) over the entire circumference of the gas turbine rotor, and widening, in width (b1, b2), the slot base (16) of the cooling air slot (19, 19

    ) as a result of the material removal in such a way that the slot base has a tear-shaped cross-sectional contour with a constriction (20) which lies at a level of the bridges (36).

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