US 5,808,263 A · 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.

Claims24

Dependent claims

A wire erosion machine for controllably correcting a drag error of a wire guide path due to bulging of the wire while cutting a workpiece, comprising:

a wire electrode;
at least one controllably movable upper guide head;
at least one upper wire guide associated with the at least one controllably movable upper guide head;
at least one controllably movable lower guide head;
at least one lower wire guide associated with the at least one controllably movable lower guide head;
moving means for moving the at least one controllably movable upper guide head and the at least one controllably movable lower guide head along a wire guide path (TD) such that a contour being cut into a workpiece;
a first calculator-processor operatively connected to the at least one controllably movable upper guide head and the at least one controllably movable lower guide head to compensate for the drag error (S) by correcting the actual wire guide-path (TD) in reference to a predetermined contour curve (UK) by determining a drag error correction vector (S.sub.B), by calculating
an amount of a drag error correction vector (.vertline.S.sub.B (t).vertline. from actual erosion parameters;
and
a direction of the drag error correction vector angle (.alpha.(x)) between the calculated drag error correction vector (S.sub.B) and a tangent to a point x of a contour curve (UK) from at least one of the actual erosion parameters and from a geometry of a predetermined contour curve.

7 more elements

A method for moving an upper and a lower guide head in relation to a workpiece in a wire erosion machine along a wire guide-path (TD) while cutting the workpiece, comprising the steps of:

a) cutting a contour into the work piece with a wire electrode;
b) compensating for an actual drag error (S) produced by the bulging of the cutting wire (1) for correcting the wire guide-path (TD) by comparing to a predetermined contour curve (UK);
c) calculating for the correction of the existing wire guide path (TD) a drag error correction vector (S.sub.B) by
calculating the amount for (.vertline.S.sub.B (t).vertline.) from the actual erosion parameters and calculating at least one of a direction of 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) from the actual erosion parameters and the geometry of the contour to be cut.

1 more element

Dependencies are inferred from the claim text.

Method and apparatus for electroerosive machining

Life of this patent

Method and apparatus for electroerosive machining

Life of this patent

Abstract

Claims24