METHOD FOR MANUFACTURING A TURBINE BLADE WITH PERFORATED COOLING HOLES AND A THERMAL BARRIER COATING Russian patent published in 2023 - IPC B23H9/10 B23H9/14 C23C4/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to the electrical discharge machining of metals and alloys by the action of electric current pulses excited between tool electrodes and parts, and can be used in the manufacture of small-diameter perforations with chamfers in cooled working and nozzle blades of gas turbine engines. The method includes electroerosive piercing of perforated cooling holes in a turbine blade with an electrode tool during its translational movement and application of a thermal barrier coating. The method uses a cylindrical electrode-tool of variable diameter, which is made stepped with a transitional conical section with a cone angle in the range of 30-90 degrees, while the electrode tool produces chamfered holes by moving the electrode tool from the moment when its transitional conical section enters the blade surface in the range of 10 to 25% of the blade wall thickness.

EFFECT: method ensures the prevention of damage to the applied coating and the ingress of coating fragments into perforated cooling holes, which maintains the calculated value of the cooling air flow passing through the holes of the blade during turbine operation.

2 cl, 4 dwg, 1 ex