Patent ID: 8034228

Claim:
A method for production of components having a three-dimensionally formed surface by a lowering operation with an electrochemical ablation process, namely a Precise Electro Chemical Machining (PECM) process, comprising the following steps: a) providing a specially pre-formed workpiece featuring a specific dimensional allowance; b) providing at least one working electrode, in which case a contour of the working electrode, or of each working electrode, is adapted to a contour of the three-dimensionally formed surface to be produced; and c) lowering the three-dimensionally formed surface by placing the pre-formed workpiece and the working electrode, or each working electrode, in an electrolyte and by applying an electrical voltage or an electrical current, in which case the working electrode, or each working electrode, is moved in a sense of a circular pivoting advance motion in a direction toward the workpiece, wherein the circular pivoting advance motion of the working electrode, or of each working electrode, in the direction toward the workpiece is superimposed by a pulsing or periodic movement of the working electrode, or of each working electrode in the direction of the advance motion; wherein the three-dimensionally formed surface is a suction-side contour and a pressure-side contour on a rotor blade of an integrally bladed rotor; wherein an integrally bladed rotor of a rotor base element and a rotor blade being integrally mounted to the base element and featuring a specific dimensional allowance are provided; wherein, furthermore, at least two working electrodes are provided for the rotor blade, a contour of one of the working electrodes being adapted to a contour of a suction-side contour to be created and a contour of the other working electrode being adapted to a contour of a pressure-side contour to be created; and wherein, furthermore, for a simultaneous lowering of the suction-side contour and the pressure-side contour on the rotor blade, the two working electrodes are moved in a sense of an opposite circular advance motion in the direction toward the rotor blade.