Revolving cathode tool and method for co-rotating electrochemical machining of inner wall of aero-engine casing

An apparatus for electrochemical machining an inner wall of an aero-engine casing, the apparatus comprising:

• a power supply;
• an anode workpiece comprising the aero-engine casing;
• a revolving cathode tool for co-rotating electrochemical machining of the inner wall of the aero-engine casing, the revolving cathode tool comprising a cathode shaft, and a flexible cathode assembly,
• wherein the cathode shaft is electrically connected with a cathode of the power supply, and the anode workpiece is electrically connected with an anode of the power supply;
• one end of the cathode shaft is connected with the flexible cathode assembly;
• an insulated window and a conductive sliding block are arranged on a side wall of the flexible cathode assembly;
• the insulated window is matched in shape with convex structures in array distribution on an inner wall of the anode workpiece,
• the conductive sliding block is matched in shape with convex structures in non-array distribution on the inner wall of the anode workpiece;
• and
• the outer side of the conductive sliding block is flush with an outer side wall of the flexible cathode assembly.