WIRE ELECTRIC DISCHARGE MACHINE WITH TENSION MONITORING FUNCTION

• US 20160184911A1
• Filed: 12/27/2015
• Published: 06/30/2016
• Est. Priority Date: 12/26/2014
• Status: Active Grant

• Current Assignee: Fanuc Corporation
• Original Assignee: Fanuc Corporation
• Inventors: MASUDA, Masashi, KAWAHARA, Akiyoshi, NAKASHIMA, Yasuo
• Granted Patent: US 10,376,975 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 1/10 Supply or regeneration of working media
• CPC Class Codes: B23H 7/104 Wire tension control
• CPC Class Codes: G05B 2219/45043 EDM machine, wire cutting

Abstract

A wire electric discharge machine with tension monitoring function comprising a tension generation unit configured to generate tension in the wire electrode, a first tension measurement unit set on the wire electrode and configured to measure tension, and a tension control unit configured to feedback tension value measured by the first tension measurement unit and output tension command value to the tension generation unit such that the tension value is equal to a target value, wherein a warning signal is configured to be generated when the tension command value output by the tension control unit is not within a set range corresponding to the target value of the tension.

Claims

1. A wire electric discharge machine with tension monitoring function configured to relatively move a wire electrode and a workpiece, apply voltage to electrode gap formed between the wire electrode and the workpiece, machine the workpiece by removal processing, the wire electric discharge machine with tension monitoring function comprising:

a tension generation unit configured to generate tension in the wire electrode;

a first tension measurement unit fixed on the wire electrode and configured to measure tension; and

a tension control unit configured to feedback tension value measured by the first tension measurement unit and output tension command value to the tension generation unit such that the tension value is equal to target value;

wherein

warning signal is configured to be generated when the tension command value output by the tension control unit is not within a set range corresponding to the target value of the tension.

2. A wire electric discharge machine with tension monitoring function according to claim 1, wherein at least one of displaying of warning and stopping of machining is performed when the warning signal is received.

3. A wire electric discharge machine with tension monitoring function according to claim 1, comprising:

a second tension measurement unit movably mounted on the wire electrode and configured to measure tension of the wire electrode;

wherein

machining is restarted when deviation of value measured by the first tension measurement unit and the second tension measurement unit is within predetermined value.

4. A wire electric discharge machine with tension monitoring function according to claim 1, wherein the second tension measurement unit is configured to be inserted by a robot.