WIRE ELECTRIC DISCHARGE MACHINE HAVING FUNCTION OF MOVING FROM ARBITRARY RETREAT POSITION IN ELECTRIC DISCHARGE STATE AND RETURNING TO HALT POSITION

• US 20160039029A1
• Filed: 08/10/2015
• Published: 02/11/2016
• Est. Priority Date: 08/11/2014
• Status: Active Grant

• Current Assignee: Fanuc Corporation
• Original Assignee: Fanuc Corporation
• Inventors: HASEGAWA, Yasuo
• Granted Patent: US 9,969,020 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B23H 1/02 Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
• CPC Class Codes: B23H 2500/20 Methods or devices for detecting wire or workpiece position
• CPC Class Codes: B23H 7/04 Apparatus for supplying current to working gap; Electric circuits specially adapted therefor
• CPC Class Codes: B23H 7/16 for preventing short circuits or other abnormal discharges by altering machining parameters using adaptive control
• CPC Class Codes: G05B 2219/45043 EDM machine, wire cutting

Abstract

Electric discharge machining is halted during machining program operation, and a position of the machining halt point is stored. A wire electrode is retreated from the machining halt point to an arbitrary position in which a short-circuit with a workpiece is removed (retreat position), by interrupt operation in which axis movement is performed manually. Then, a return is made from the retreat position to the machining halt point while electric discharge machining is performed, machining program operation is started from the machining halt point, and electric discharge machining is restarted.

Claims

1. A wire electric discharge machine having a function of restarting machining at a machining halt point, comprising:

a storage unit that stores a halt position when program operation is halted after the start of machining by the program operation;

an axis movement retreat unit that retreats a wire electrode from the halt position to an arbitrary retreat position by a manual interrupt;

a return unit that returns the wire electrode in an electric discharge state from the arbitrary retreat position to the halt position; and

a machining restart unit that restarts machining after the return of the wire electrode by the return unit.

2. The wire electric discharge machine according to claim 1, wherein the return unit is configured to control a feedrate under the same machining conditions as those for automatic machining by a program when the return unit returns the wire electrode in an electric discharge state from the arbitrary retreat position to the halt position.

3. A wire electric discharge machine having a function of restarting machining at a machining halt point, comprising:

a return unit that makes tracing back a programmed path of a movement block (G00) of a rapid traverse positioning instruction to a position in which a short-circuit is removed if a wire electrode and a workpiece are in a short-circuit state in a position in which the rapid traverse positioning instruction block is switched to a machining instruction block after the start of machining by program operation, and starts electric discharging and makes a return to a halt position while machining is performed by reading the rapid traverse positioning instruction block as the machining instruction block after the short-circuit is removed.

4. A wire electric discharge machine having a function of restarting machining at a machining halt point, comprising:

a return unit that makes positioning for a return to a programmed start point of a movement block (G00) of a rapid traverse positioning instruction if a wire electrode and a workpiece are in a short-circuit state in a position in which the rapid traverse positioning instruction block is switched to a machining instruction block after the start of machining by program operation, and makes a return to a halt position while electric discharge machining is performed by reading the rapid traverse positioning instruction block as the machining instruction block.