STUDY OF THE TECHNOLOGICAL POSSIBILITIES OF THE BALL PROCESSING METHOD IN THE MAGNETIC FIELD OF BLADES WITH OPERATIONAL DAMAGE

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Purpose. To conduct a study of the technological possibilities of the method of treatment with balls in the magnetic field of the pen of vanes that have operational damage. Research methods. A mechanical method for the study of residual stresses, developed by аcad. Davydenkov, an experimental method for determining the endurance of blades, stepwise regression methods for building regression models. Results. The study of the geometry of the blade feathers shows that the biggest change in the geometry of the blades occurs in the peripheral zone (intersections A7-A7 and A8-A8). The measurement results show that the microhardness of the surface on the side of the trough is significantly lower than on the backs, and the highest values of roughness are recorded in the peripheral zone of the trough on the side of the entrance edge, which corresponds to the place of maximum operational damage. The parameters of the surface layer were studied and the scheme and optimal mode of processing blades with steel balls in a magnetic field was determined, which leads to a 39% increase in the endurance limit compared to blades that have experience in operation. Regression models of self-oscillation frequencies and blade run-in were built for two engines operated under the same conditions, but with different run-in. Special attention should be paid to measures that can minimize erosive wear of blade edges and increase the service life of engines. Scientific novelty. A new method of processing the blade feathers with balls in a magnetic field is proposed, which allows differential processing of the blade feathers: only the edge or the entire feather. Also, the method allows you to process blade feathers with operational damage, which leads to increased durability of blades. Practical value. The conducted studies allow us to recommend the use of the method of processing blade feathers with steel balls in a magnetic field as a technological operation for the restoration of compressor blades that have operational damage in the form of potholes on the inlet edges.