The blade surface morphology has a significant impact on the life, performance, and stability of aeroengine integral impellers. The surface roughness of such free-form surfaces can be reduced usingnumerical control electrochemical mechanical polishing (NC ECMP), which is a combination of CNCtechnology, electrolytic polishing, and mechanical grinding. In this study, based on a YG8 cementedcarbide specimen, two types of cathode polishing plate materials were compared and selected. Theelectrolyte ratio was optimized by conducting an orthogonal test. The relationship between the voltage,feed speed, spindle speed, duty cycle, cathode positive pressure, and surface roughness were studied.Finally, an integral impeller was polished under a set of optimized parameters, and its surfaceroughness was reduced from Ra 0.85 μm to Ra 0.215 μm. Our results confirm that the five-axis NCECMP is an economical and effective method for polishing complex surfaces, particularly in aerospaceapplications.
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