Methods for correcting twist angle in a gas turbine engine blade
AssigneeUnited Technologies Corporation
InventorsGarrett Kernozicky, Ephraim C. Davis, Thomas P. Cap, Paul Balko
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Abstract
A method of correcting a twist angle of a gas turbine engine blade includes measuring an existing twist angle of the blade, applying a first angular load to a first end of the blade; and measuring a repaired twist angle of the blade. The first angular load applied to the first end of the blade is based on an empirical correlation between a plurality of angular loads necessary to produce a plurality of twist angle correction values.
Claims23
A method of correcting a twist angle of a gas turbine engine blade, the method comprising:
- measuring an existing twist angle of the blade;
- applying a first angular load to a first end of the blade;
- and
- measuring a repaired twist angle of the blade;
- wherein the first angular load applied to the first end of the blade is based on an empirical correlation between a plurality of angular loads necessary to produce a plurality of twist angle correction values.
A method of correcting a twist angle of a gas turbine engine blade, the method comprising:
- measuring an existing twist angle of the blade;
- applying a first angular load to a tip of the blade to produce an overcorrected twist angle in the blade, wherein the first angular load applied to the tip of the blade is based on an empirical correlation between a plurality of angular loads necessary to produce a plurality of twist angle correction values;
- measuring the overcorrected twist angle of the blade;
- heat treating the blade to reduce residual stresses in the blade;
- and
- measuring a repaired twist angle of the blade.
A method of correcting a twist angle of a gas turbine engine blade, the method comprising:
- restraining a root of the blade;
- measuring an existing twist angle of the blade;
- applying a first angular load to a tip of the blade to produce an overcorrected twist angle in the blade, wherein the first angular load applied to the tip of the blade is based on an empirical correlation between a plurality of angular loads necessary to produce a plurality of twist angle correction values;
- measuring an overcorrected twist angle of the blade;
- heat treating the blade to reduce residual stresses in the blade, wherein heat treating the blade reduces the overcorrected twist angle of the blade and the empirical correlation accounts for the reduction in the overcorrected twist angle caused by heat treating the blade;
- and
- measuring a repaired twist angle of the blade, wherein the repaired twist angle is equal to the overcorrected twist angle reduced by heat treating the blade.
Dependencies are inferred from the claim text.