WIRE ELECTRIC DISCHARGE MACHINING APPARATUS

• US 20160023291A1
• Filed: 07/23/2015
• Published: 01/28/2016
• Est. Priority Date: 07/25/2014
• Status: Active Grant

• Current Assignee: Sodick Company Limited (Plustech, Inc.)
• Original Assignee: Sodick Company Limited (Plustech, Inc.)
• Inventors: INOUE, HIROTOSHI
• Granted Patent: US 10,010,957 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 11/00 Auxiliary apparatus or details, not otherwise provided for
• CPC Class Codes: B23H 7/102 Automatic wire threading
• CPC Class Codes: B23H 7/104 Wire tension control

Abstract

A control device 8 controls a tension device 10 to apply a tension to a wire electrode WE such that a set tension value is as small as possible within a range of 80g or less during a particular anneal period when a particular anneal current is supplied from a current supply device 5.

Claims

1. A wire electric discharge machining apparatus comprising an automatic wire threader for automatically stretching a wire electrode between a pair of wire guides, a tension device for applying a particular tension to the wire electrode, and a current supply device for supplying a current to the wire electrode, the wire electric discharge machining apparatus comprising:

a control device, controlling the tension device to apply a tension to the wire electrode such that a set tension value is as small as possible within a range of 80 g or less during a period when a anneal current is supplied from the current supply device,

wherein, the tension device is controlled at the same time the supply of the anneal current is stopped, so as to apply a tension to the wire electrode such that the set tension value is lowered by 10 g or more and within a range such that the set tension value is not 0 g and then is returned to the original set tension value after a period of time has passed.