Patent ID: 8097131

Claim:
An electrochemical machining method of a conductive workpiece including a blade-shaped portion and blade end plates, the blade-shaped portion having an aerofoil shape in cross section, the blade end plates being provided to a longitudinal both ends of the blade-shaped portion to be substantially orthogonal to the longitudinal direction of the blade-shaped portion, comprising the steps of: advancing a main electrode in an acute angle direction relatively to the longitudinal direction of the blade-shaped portion; electrochemically machining, by the main electrode, a part of the blade-shaped portion and one of the blade end plates disposed to be in continuation therewith; advancing an auxiliary electrode to be slid along a slope of the main electrode, the slop forming an acute angle relative to a machining surface of the main electrode for machining the blade-shaped portion; and electrochemically machining, by the auxiliary electrode, a remaining part of the blade-shaped portion and the other of the blade end plates disposed to be in continuation therewith.