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EP0068029A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method of controlling wire cut electric discharge machining

Assignee: Fanuc Corp
•
Filing: 1981-12-28
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Granted: —
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Expires: 2001-12-28
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Abstract

Abstract A method of controlling the machining in a wire cut electric discharge machining apparatus for machining workpiece in a prescribed shape, which makes it possible to reduce the machining error in corners caused by deflection of the wire electrode by the steps of: applying a voltage between the wire electrode and the work, cutting the work with the discharge energy, and moving the work relative to the wire electrode in accordance with machining instruction data. An override amount (K) is obtained by an override amount calculator (103b) using corner radius data (r) and a corner angle data (0) applied as machining instruction data from paper tape (101), and a relative speed (F) is calculated by a relative speed calculator (103f) using the override amount (K) and the instructed feed speed (F o ). Motors (MX, MY) are respectively rotated via pulse distributors (105X, 105Y) and servo circuits (SVX, SVY) in accordance with the relative speed (F) lower than the instructed feeding speed (F a ), the work is moved relative to the wire electrode, and the corner is electrical discharge machined.

Inventors

  • 👤 Gotaro Gamo
  • 👤 Mitsuo Kinoshita
  • 👤 Haruki Obara

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 11:36
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; B; B23; B23H; B23H7/00; B23H7/02; B23H7/06; B23H7/065; G05B2219/00; G05B2219/30; G05B2219/45; G05B2219/45221; G05B2219/49; G05B2219/49164

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 140 words
A method of controlling a wire-cut electric discharge machine to apply a voltage between a wire electrode and a workpiece for cutting off the latter with electctric discharge energy while the wire electrode and the workpiece are being moved relatively to each other based on cutting command data to thereby cut the workpiece to a predetermined shape, said method comprising the steps of determining a speed of relative feeding movement between the workpiece and the wire electrode based on data on a radius of curvature of a corner, data on a corner angle, and data on a feeding speed which are given as said cutting command data when cutting the corner, and moving the workpiece and the wire electrode relatively to each other at a feeding speed lower than said commanded feeding speed for electric discharge cutting of the corner.
Claim 2
Independent Claim 140 words
A method of controlling a wire-cut electric discharge machine to apply a voltage between a wire electrode and a workpiece for cutting off the latter with electctric discharge energy while the wire electrode and the workpiece are being moved relatively to each other based on cutting command data to thereby cut the workpiece to a predetermined shape, said method comprising the steps of determining a speed of relative feeding movement between the workpiece and the wire electrode based on data on a radius of curvature of a corner, data on a corner angle, and data on a feeding speed which are given as said cutting command data when cutting the corner, and moving the workpiece and the wire electrode relatively to each other at a feeding speed lower than said commanded feeding speed for electric discharge cutting of the corner.
Claim 3
Dependent Claim 21 words
A method according to claim 1, wherein data on the thickness of said workpiece is added in determining said feeding speed.
Claim 4
Dependent Claim 52 words
A method according to claim 1, wherein said data on the radius of curvature of the corner and said data on the corner angle are used to determine an amount of override, said feeding speed being determined by an arithmetic operation involving said determined amount of override and said commanded feeding speed.
Claim 5
Dependent Claim 64 words
A method according to claim 2, wherein said data on the radius of curvature of the corner and said data on the corner angle are used to determine an amount of override, said feeding speed being determined by an arithmetic operation involving said determined amount of override, said commanded feeding speed, and a constant dependent on said data on the thickness of the workpiece.
Claim 6
Dependent Claim 46 words
A method according to claim 1, wherein a table is prepared to store amounts of override dependent on said cutting command data, said feeding speed being determined by an arithmetic operation involving an amount of override picked up from said table and the commanded feeding speed.

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