Ti6A14V is widely applied in the integral cascades of aero engines.As an effective machining method,electrochemical trepanning(ECTr)has unique advantages in processing surface parts made of hard-to-cut materials.In ECTr,the state of the flow field has a significant effect on processing stability and machining quality.To improve the uniformity of the flow field when ECTr is applied to Ti6A14V,two different flow modes are designed,namely full-profile electrolyte supply(FPES)and edges electrolyte supply(EES).Different from the traditional forward flow mode,the flow directions of the electrolyte in the proposed modes are controlled by inlet channels.Simula-tions show that the flow field under EES is more uniform than that under FPES.To further enhance the uniformity of the flow field,the structure of EES is optimized by modifying the insulating sleeve.In the optimized configuration,the longitudinal distance between the center of the inlet hole and the center of the blade is 6.0 mm,the lateral distance between the centers of the inlet holes on both sides is 16.5 mm,the length to which the electrolyte enters the machining area is 1.5 mm,and the height of the insulating sleeve is 13.5 mm.A series of ECTr experiments are performed under the two flow modes.Compared with EES,the blade machined by FPES is less accurate and has poorer surface quality,with a surface roughness(Ra)of 3.346 pm.Under the optimized EES,the machining quality is effectively enhanced,with the surface quality improved from Ra=2.621 pm to Ra=1.815 pm,thus confirming the efficacy of the proposed methods.

Gaopan LEI;Dong ZHU;Jiabao LI

College of Mechanical&Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

中国航空学报（英文版）

[1]Gaopan LEI;Dong ZHU;Jiabao LI-.Optimization of flow field in electrochemical trepanning of integral cascades(Ti6A14V))[J].中国航空学报（英文版）,2022(10):354-364

trepanning,ECTr

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