Method and apparatus for electroerosive machining

Abstract

A method and apparatus for moving guide heads, possibly of a workpiece, of a wire erosion machine along in each case a wire guide path (TD) in which connection, by a cutting wire (1) traveling between the guide heads, a contour is cut into the workpiece (5) and the actual drag error (S) produced by the bulging of the cutting wire (1) is compensated for in the manner that the existing wire guide path (TD) is corrected with reference to a contour to be cut which is represented by at least one contour curve (UK), characterized by the fact that, for the correction of the existing wire guide path (TD), a drag error correction vector (S.sub.B) is calculated, its amount (.vertline.S.sub.B (t).vertline.) being calculated from the instantaneous erosion parameters forming the basis of the erosion and its direction, in particular the angle (.alpha.(x)) between the calculated drag error correction vector (S.sub.B) and the tangent to a point x of the contour curve (UK), being calculated from the instantaneous erosion parameters forming the basis of the erosion and/or from the geometry of the contour to be cut.