# US 7,465,898 B2 · Wire electric discharge machining method of machining workpiece with different thickness

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- Number: US 7,465,898 B2
- Document ID: US7465898B2
- Status: Granted
- Kind: B2
- Application number: 11/605,424
- Filed: 2006-11-29
- Published: 2007-05-31
- Granted: 2008-12-16
- Earliest claimed: 2005-11-29
- Assignees: Sodick Co., Ltd.
- Inventors: Mikio Kaneko
- Web page: https://patentgrep.com/patent/US7465898B2

## CPC

- B23H 7/04: Apparatus for supplying current to working gap; Electric circuits specially adapted therefor
- B23H 7/065: {Electric circuits specially adapted therefor}
- B23H: WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL (processes for the electrolytic or electrophoretic production of coatings, electroforming, or apparatus therefor C25D; processes for the electrolytic removal of material from objects C25F; manufacturing printed circuits using precipitation techniques to apply the conductive material to form the desired conductive pattern H05K3/18)

## Abstract

A wire electric discharge machining method of machining the workpiece with different thickness into a required shape with first cut and second cut. The method includes the steps of (a) detecting a position of the wire electrode relative to the workpiece, (b) detecting change in thickness of the workpiece during first cut, (c) storing the position of wire electrode as a thickness change position (Q1) when change in thickness of the workpiece from a first thickness (t1) to a second thickness (t2) is detected, (d) forming a zone (α) around the thickness change position, (e) comparing the position of wire electrode to the zone during second cut, and (f) changing at least one machining condition during times when it is determined that the wire electrode is positioned in the zone.

## Claims

### Claim 1

A wire electric discharge machining method of machining a workpiece into a required shape with a first cut and a second cut, each cut corresponding with different machining conditions and a wire path on which a wire electrode is moved relative to the workpiece being set for the cut, the method comprising the steps of:
(a) detecting a position of the wire electrode relative to the workpiece;
(b) detecting a change in thickness of the workpiece during the first cut;
(c) storing the position of the wire electrode as a thickness change position when change in thickness of the workpiece from a first thickness to a second thickness is detected;
(d) forming a zone around the thickness change position;
(e) comparing the position of the wire electrode to the zone during the second cut; and
(f) changing at least one machining condition during times when it is determined that the wire electrode is positioned in the zone.

### Claim 2 (depends on 1)

The wire electric discharge machining method of claim 1, wherein a side length of the zone is based on a difference between a first offset for the first cut and a second offset for the second cut.

### Claim 3 (depends on 1)

The wire electric discharge machining method of claim 1, further comprising the step of:
storing the first and second thicknesses related to the thickness change position.

### Claim 4 (depends on 1)

The wire electric discharge machining method of claim 1, further comprising the step of:
forming an additional zone around a crossing position at which the wire electrode reaches the zone,
wherein the step (f) comprises changing at least one machining condition when it is determined that the wire electrode is positioned outside the additional zone.