WIRE ELECTRIC DISCHARGE MACHINE PROVIDED WITH DISCONNECTION REPAIRING UNIT

• US 20150367437A1
• Filed: 06/22/2015
• Published: 12/24/2015
• Est. Priority Date: 06/23/2014
• Status: Active Grant

• Current Assignee: Fanuc Corporation
• Original Assignee: Fanuc Corporation
• Inventors: IRIE, Shouta, HIRAGA, Kaoru
• Granted Patent: US 10,500,660 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B23H 1/024 Detection of, and response to, abnormal gap conditions, e.g. short circuits preventing short circuits or other abnormal discharges by altering machining parameters using adaptive control B23H7/16
• CPC Class Codes: B23H 7/04 Apparatus for supplying current to working gap; Electric circuits specially adapted therefor
• CPC Class Codes: B23H 7/102 Automatic wire threading

Abstract

A wire electric discharge machine provided with a disconnection repairing unit includes a core-fixing-end-position storing unit for storing a core fixing end position of a depositing and accumulating operation machined most lately among positions at which the depositing and accumulating operation for machining wastes by a core fixing function ends in a machining shape currently being machined and a disconnection repairing unit for executing automatic connection between a disconnection position and the core fixing end position.

Claims

1. A wire electric discharge machine provided with a disconnection repairing unit, including

a disconnection repairing unit for performing, when a wire electrode is disconnected during electric discharge machining, automatic connection on a machined machining route, returning to a position where a wire is disconnected along the machining route, and resuming the electric discharge machining from a disconnection position of the wire electrode, and configured to

perform a core fixing by, electric-discharge machining of a workpiece with electric discharge generated between the wire electrode and the workpiece, and depositing and accumulating machining wastes caused by the electric discharge machining to thereby fix a core generated by the electric discharge machining and the workpiece, and,

machine the workpiece along the machining route while controlling the respective moving axes and calculating coordinates of the respective moving axes and a machining distance according to a machining program, and the wire electric discharge machine provided with a disconnection repairing unit comprising:

a core-fixing-end-position storing unit for storing a core fixing end position of a depositing and accumulating operation machined most lately among positions at which the depositing and accumulating operation for the machining wastes by the core fixing function ends in a machining shape currently being machined, and

the wire electric discharge machine executes automatic connection with the disconnection repairing unit between the disconnection position and the core fixing end position.

2. The wire electric discharge machine provided with the disconnection repairing unit according to claim 1, wherein

the disconnection repairing unit includes a core-fixing-end-position determining unit for determining whether the automatic connection position by the disconnection repairing unit is present between the disconnection position and the core fixing end position, and

the disconnection repairing unit is configured to execute the automatic connection, when the core-fixing-end-position determining unit determines that the automatic connection position is present between the disconnection position and the core fixing end position.

3. The wire electric discharge machine provided with the disconnection repairing unit according to claim 1, wherein the disconnection repairing unit is configured to retract from the disconnection position along the machining route and performs the automatic connection and, when the connection cannot be performed, further repeat an operation for retracting along the machining route and performing the automatic connection.

4. The wire electric discharge machine provided with the disconnection repairing unit according to claim 2, wherein, the wire electric discharge machine is configured to display an alarm when the core-fixing-end-position determining unit determines that the automatic connection position is absent between the disconnection position and the core fixing end position.

5. The wire electric discharge machine provided with the disconnection repairing unit according to claim 2, wherein, the wire electric discharge machine is configured to skip the machining to a connection command position and resume the machining from the connection command position, when the core-fixing-end-position determining unit determines that the automatic connection position is absent between the disconnection position and the core fixing end position, and when the connection command position is present ahead of a program position during disconnection.

6. The wire electric discharge machine provided with the disconnection repairing unit according to claim 2, wherein

the core-fixing-end-position determining unit includes:

a disconnection-position storing unit for storing, when the wire electrode is disconnected during the electric discharge machining, a disconnection position on the machining route; and

a retraction-position calculating unit for calculating a retraction position from the disconnection position when the retraction is performed along the machining route by the disconnection repairing unit, and

the core-fixing-end-position determining unit configured to determine, from the disconnection position, the core fixing end position, and the retraction position, whether the automatic connection position is present between the disconnection position and the core fixing end position.

7. The wire electric discharge machine provided with the disconnection repairing unit according to claim 2, wherein

the core-fixing-end-position determining unit includes a retraction-position storing unit for storing, as a retraction position, a position during retraction along the machining route by the disconnection repairing unit, and

the core-fixing-end-position determining unit is configured to determine, from the core fixing end position and the retraction position, whether the automatic connection position is present between the disconnection position and the core fixing end position.