# US 2014/0190940 A1 · Wire electrical discharge machine which corrects machining path in corner portion

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- Number: US 2014/0190940 A1
- Document ID: US20140190940A1
- Status: Published application
- Kind: A1
- Application number: 14/107,283
- Filed: 2013-12-16
- Published: 2014-07-10
- Earliest claimed: 2013-01-09
- Assignees: Fanuc Corporation
- Applicants: Fanuc Corporation
- Inventors: Kaoru HIRAGA
- Web page: https://patentgrep.com/patent/US20140190940A1

## CPC

- B23H 7/06: Control of the travel curve of the relative movement between electrode and workpiece
- B23H 7/065: {Electric circuits specially adapted therefor}
- G05B 19/4097: characterised by using design data to control NC machines, e.g. CAD/CAM (G05B19/4093 takes precedence)
- G05B 2219/45221: Edm, electrical discharge machining, electroerosion, ecm, chemical
- G05B 2219/49164: Corner, making corner
- 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)
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)

## Abstract

In a corner portion formed at an intersection of a first block to be machined first and a second block to be machined second, an end point of the first block is extended. Then, after moving from the first block to the extended end point of the first block, a wire electrode of an electrical discharge machine returns to an end point of the original block (an end point of the original first block and a start point of the original second block) therefrom along the same path as before, and machines the second block therefrom.

## Claims

### Claim 1

A wire electrical discharge machine adapted to create a machining path based on an axis movement command from a machining program and perform machining by moving a wire electrode and a workpiece relative to each other according to the created machining path, the wire electrical discharge machine comprising
a machining path correction unit adapted to correct the machining path such that in a corner portion formed at an intersection of two consecutive movement blocks in the created machining path, the two consecutive movement blocks being a first block to be machined first and a second block to be machined second, a corrected path will be generated by extending an end point of the first block, that when an extended block end point is reached by moving along the corrected path, a machining path which returns to the end point of the original block along the corrected path will be newly created, and that the second block will be machined by continuing from the newly created machining path.

### Claim 2 (depends on 1)

The wire electrical discharge machine according to claim 1, wherein a distance by which the end point of the first block is extended is set equal to a deflection amount of the wire electrode.

### Claim 3 (depends on 1)

The wire electrical discharge machine according to claim 1, wherein in the corner portion, the second block is machined by reducing machining energy compared to when the first block is machined.

### Claim 4 (depends on 1)

The wire electrical discharge machine according to claim 1, wherein in the corner portion, the second block is machined by reducing the amount of machining fluid compared to when the first block is machined.

### Claim 5 (depends on 1)

The wire electrical discharge machine according to claim 1, wherein the corner portion is a concave corner portion.